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用Visual C++实现屏幕抓图程序

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 在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示: "ZH1W9A  
  [ -%oO  
  一、实现方法 [fb-G5x  
|[qI2-el?  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: aw,8'N)  
B1GSZUd^?0  
#pragma data_seg("shareddata") $Fo ,$  
HHOOK hHook =NULL; //钩子句柄 iX,Qh2(ig  
UINT nHookCount =0; //挂接的程序数目 8-m"]o3  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 eBP N[V  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 o(a*Fk$  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey :ortyCB:H  
static int KeyCount =0; (cMrEuv  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ^c2 8Q.<w(  
#pragma data_seg() ]s<Q-/X  
aH:eu<s  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 Ji7A9Hk  
;[|x5o /<  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: gcz1*3)  
E 1>3[3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ~r{Nc j  
cKey,UCHAR cMask) gh~C.>W}q+  
{ s_]rje8`  
 BOOL bAdded=FALSE; F'"-4YV>&  
 for(int index=0;index<MAX_KEY;index++){ h.c)+wz/%C  
  if(hCallWnd[index]==0){ _x:K%1_[  
   hCallWnd[index]=hWnd; ?=\h/C  
   HotKey[index]=cKey; ve>8vw2  
   HotKeyMask[index]=cMask; Ar\`OhR  
   bAdded=TRUE; #3qkG)  
   KeyCount++; IX3r$}4  
   break; gU 8'7H2  
  } ^EB}e15"  
 } 5tf/VT   
 return bAdded; h;B'#$_  
} DZ EA*E>  
//删除热键 Sw0~6RZ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) C|>#|5XaF  
{ %xY'v$ %  
 BOOL bRemoved=FALSE; =7jkW (Q  
 for(int index=0;index<MAX_KEY;index++){ aC:rrS  
  if(hCallWnd[index]==hWnd){ _{A($/~c?  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ UH)A n:9  
    hCallWnd[index]=NULL; Z(V 4"x7F  
    HotKey[index]=0; pIh@!C  
    HotKeyMask[index]=0; [6c{t  
    bRemoved=TRUE; M+ H$Jjcs  
    KeyCount--; $1w8GI\J  
    break; Z{e5 OJ  
   } 'SuYNA)  
  } 1sgoT f%  
 } &)wQ|{P~k  
 return bRemoved; v7g-M  
} QN0Ik 2L  
q-uYfXZ{j  
y(q1~73s  
  DLL中的钩子函数如下: > sUk6Z~  
al^ yCoB  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) D7=gUm >  
{ 94n,13  
 BOOL bProcessed=FALSE; jdhhvoQ  
 if(HC_ACTION==nCode) 9'T(Fc  
 { )2R:P`U  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Z'u`)jR  
   switch(wParam) rMI:zFS  
   {  ]A_)&`"Cb  
    case VK_MENU: z`/v}'d[X  
     MaskBits&=~ALTBIT; ."MBKyg6  
     break; ] qrO"X=  
    case VK_CONTROL: )[/+j"F   
     MaskBits&=~CTRLBIT; >0f5Mjug  
     break; n0EKNMO  
    case VK_SHIFT: -]N/P{=L  
     MaskBits&=~SHIFTBIT; KC  
     break; ^^v\ T  
    default: //judge the key and send message "F0,S~tZZ  
     break; "--rz;+K  
   } Ar>-xCT D  
   for(int index=0;index<MAX_KEY;index++){ b7=]"|c$@  
    if(hCallWnd[index]==NULL) P$q IB[Xi  
     continue;  vH` u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Rk"_4zJk  
    { %]NbTTL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); X3'z'5  
     bProcessed=TRUE; G66vzwO   
    } 0C3CqGP  
   } FzW(An&x2  
  } aLP 2p]  
  else if((lParam&0xc000ffff)==1){ //有键按下 Ii;~ xc  
   switch(wParam) f\Pd#$3  
   { Rh: \/31~  
    case VK_MENU: 03# r F@e  
     MaskBits|=ALTBIT; '?q|7[SU  
     break; Yj;$hV8j(  
    case VK_CONTROL: cz.-cuD[iD  
     MaskBits|=CTRLBIT; Tl9_Wi  
     break; {Rbc  
    case VK_SHIFT: g{dyDN$5|w  
     MaskBits|=SHIFTBIT; <~f/T]E,  
     break; 2<<,aL*  
    default: //judge the key and send message GT* \gZ  
     break; B<+}_3.  
   } y|c]r!A  
   for(int index=0;index<MAX_KEY;index++){ _e/v w:  
    if(hCallWnd[index]==NULL) 1!,lI?j,  
     continue; HSyohP87  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }>SHTHVye  
    { D @T,j4o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #Mi>f4T;  
     bProcessed=TRUE; \Q]2Zq  
    } 1 aIJ0#nE  
   } TVYO`9:CW  
  } 27gK Y Zf;  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 +|\dVe.  
   for(int index=0;index<MAX_KEY;index++){ 1)M3*h3  
    if(hCallWnd[index]==NULL) skr^m%W  
     continue; Nqy',N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) nz+DPk["  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); hO\_RhsRy?  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ]#_,?d  
   } O /aC%%  
  } *O+YhoR?  
 } evZ{~v& /  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); x1wm]|BIf  
} dxxD%lHCF  
.}2^YOmd  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: C$Ldz=d  
%Wn/)#T|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~E#>2Mh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); YP+0 uZ[g  
vlx wt~  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: HuCH`|v-  
i3N _wv{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) rAk*~OK  
{ fq _6xs  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) q4Qm: |-  
 { )k=8.j4  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Cd]d[{NJ;  
  SaveBmp(); "wA3l%d[Y  
  return FALSE; IZniRd;  
 } %<:?{<~wH9  
 …… //其它处理及默认处理 [sbC6(z  
} :,6dW?mun6  
`dMl5b  
1z0&+C3z  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 YtE V8w_$  
d{I|4h  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ?}lgwKBHl;  
QV7K~qi  
  二、编程步骤 }[$C=|>  
5c`DkWne%  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; % ;09J  
8kX3.X`  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ct fKxGH  
^=}~  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; T&6{|IfM_  
{ SJ=|L6  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; K-(,,wS  
"pQM$3n(  
  5、 添加代码,编译运行程序。 9^)ochY3  
s>E4.0[I%  
三、程序代码 G{$9e}#  
t&eY+3y,T  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 4f'WF5S/}8  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)  \^w=T*  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Ds$FO}KD{  
#if _MSC_VER > 1000 }|&M@Up  
#pragma once 7 8Nli/U  
#endif // _MSC_VER > 1000 VNx}ADXu]  
#ifndef __AFXWIN_H__ u7<B*d:  
#error include 'stdafx.h' before including this file for PCH E&jngxlN  
#endif C<eeAWP3v  
#include "resource.h" // main symbols w[UPoG #Uh  
class CHookApp : public CWinApp ;9/6X#;$  
{ .9S  
 public: }ZlJ  
  CHookApp(); 3@\vU~=P:  
  // Overrides [A fV+$  
  // ClassWizard generated virtual function overrides Y+F$]!hw  
  //{{AFX_VIRTUAL(CHookApp) ;M>0,  
 public: C5*j0}  
  virtual BOOL InitInstance(); m%'9zL c  
  virtual int ExitInstance(); kT[]^Jtc  
  //}}AFX_VIRTUAL Y6W3WPs(  
  //{{AFX_MSG(CHookApp) yI h>j.P  
  // NOTE - the ClassWizard will add and remove member functions here. 0+m"eGwTm  
  // DO NOT EDIT what you see in these blocks of generated code ! (<=qW_iW  
  //}}AFX_MSG l92#F*  
  DECLARE_MESSAGE_MAP() 'w^1re= R  
}; to(OVg7_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 0[x?Q[~S_0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8HxB\ !0F?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u3dhMnUn  
BOOL InitHotkey(); AW!|xA6'`:  
BOOL UnInit(); L_=J(H|  
#endif > rB7ms/@E  
dPPe_% Ilr  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 2u~0B +)K/  
#include "stdafx.h" mv)M9c,`  
#include "hook.h" N|WnUlf]:  
#include <windowsx.h> qd%5[A  
#ifdef _DEBUG P)tXU  
#define new DEBUG_NEW #B &D  
#undef THIS_FILE ^Qs-@]E-  
static char THIS_FILE[] = __FILE__; {uDL"~^\  
#endif \b1I<4(  
#define MAX_KEY 100 ;yx+BaG~?  
#define CTRLBIT 0x04 4Q,HhqV'  
#define ALTBIT 0x02 nZ$,Bjb  
#define SHIFTBIT 0x01 iEsI  
#pragma data_seg("shareddata") U3&*,xeU@H  
HHOOK hHook =NULL; 4;7<)&#h  
UINT nHookCount =0; >8#(GXnSt  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey *;1G+Q#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT #Jq@p_T"  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey hUxpz:U*  
static int KeyCount =0; @$F(({?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift acRPKTs H  
#pragma data_seg() =5+M]y E<  
HINSTANCE hins; _C)u#]t  
void VerifyWindow(); = K"F!}  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) psta&u\ q  
//{{AFX_MSG_MAP(CHookApp) \@:pWe  
// NOTE - the ClassWizard will add and remove mapping macros here. @|j`I1r.A  
// DO NOT EDIT what you see in these blocks of generated code! :nd }e  
//}}AFX_MSG_MAP tI{pu}/"#  
END_MESSAGE_MAP() +pnT6kU|  
)><cL:IJ}S  
CHookApp::CHookApp() r%&hiobMYs  
{ C;OU2,c,T  
 // TODO: add construction code here, tv,^ Q}  
 // Place all significant initialization in InitInstance vpMNulXb,  
} H2zd@l:R  
yaa+j8s]  
CHookApp theApp; w(k7nGU]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {t;Q#Ou.  
{ lmz{,O  
 BOOL bProcessed=FALSE; k(3 s^B  
 if(HC_ACTION==nCode) &bRmr/D  
 { +`yDWN?7  
  if((lParam&0xc0000000)==0xc0000000){// Key up "k"q)5c  
   switch(wParam) [t: =%&B  
   { oB&s2~  
    case VK_MENU: M#=woj&[  
     MaskBits&=~ALTBIT; S2*-UluG  
     break; )tz8(S  
    case VK_CONTROL: Y~,[9:SR  
     MaskBits&=~CTRLBIT; t8U)za  
     break; $lU~3I)  
    case VK_SHIFT: u)t1t69T\g  
     MaskBits&=~SHIFTBIT; 23U9+  
     break; BYhPOg[  
    default: //judge the key and send message Yn'XSV|g  
     break; 1;?b-FEq:  
   } ) ok_"wB  
   for(int index=0;index<MAX_KEY;index++){ s><RL]+{G+  
    if(hCallWnd[index]==NULL) +7sdQCO(Co  
     continue; b! PN6<SI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) WLDt5R  
    { )d>"K`3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >Djv8 0  
     bProcessed=TRUE; 7>9/bB+TL  
    } 3 ^{U:"N0  
   } 4<ER dP7"-  
  } W a2V Z  
  else if((lParam&0xc000ffff)==1){ //Key down TAi |]U!  
   switch(wParam) wAVO%8u  
   { r&o%n5B  
    case VK_MENU: KG4~t=J`  
     MaskBits|=ALTBIT; ;k (}~_  
     break; n)sK#C-VA  
    case VK_CONTROL: z=?ainnKx  
     MaskBits|=CTRLBIT; l!~8  
     break; -XPGl  
    case VK_SHIFT: ]\+bx=  
     MaskBits|=SHIFTBIT; v)%EG  
     break; RVXRF_I  
    default: //judge the key and send message s,]6Lri`\  
     break; 6$%]p1"!K  
   } jQ%}e"  
   for(int index=0;index<MAX_KEY;index++) FnvN 4h{S  
   { \%mR*J+  
    if(hCallWnd[index]==NULL) RgRyo  
     continue; :1hp_XfJb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O)\xElu  
    { [LjYLm%<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); zOg#=ql  
     bProcessed=TRUE; ]^8:"Ky'  
    } ky#<\K1}'  
   } 9/~m837x  
  } +ulX(u(,  
  if(!bProcessed){ IN , @  
   for(int index=0;index<MAX_KEY;index++){ ["Z]K'?P  
    if(hCallWnd[index]==NULL) ~ W52Mbf  
     continue; `w[0q?}"`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ( J\D"4q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); v~L} :  
   } vTh-I&}:  
  } ~Xh(JK]  
 } TG{=~2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); p%xo@v(  
} |>j=#2  
rZKv:x}{6  
BOOL InitHotkey() No =f&GVg  
{ O|4~$7  
 if(hHook!=NULL){ 3|/ ;`KfQ  
  nHookCount++; jdXkU  
  return TRUE; ;s9!ra:3  
 } `vL R;D  
 else Y 0$m~}j  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); wD22@uM#]  
  if(hHook!=NULL) 9} eIidwK  
   nHookCount++; TcauCL  
  return (hHook!=NULL); UF D_  
} A!Xn^U*p  
BOOL UnInit() ugVsp&i#  
{ vkc(-n  
 if(nHookCount>1){ HR['y9 U  
  nHookCount--; qf4|!UR{  
  return TRUE; ,y:q]PR  
 } _YmY y\g  
 BOOL unhooked = UnhookWindowsHookEx(hHook); |pq z(j7  
 if(unhooked==TRUE){ _^#PV}  
  nHookCount=0; +\"@2mOH{+  
  hHook=NULL; WuSRA<{P  
 } o1GWcxu*\  
 return unhooked; v@Otp  
} )K8JDP  
Wq&TbWR  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 14s+ &  
{ 0EPF; Xx  
 BOOL bAdded=FALSE; j(va# f#  
 for(int index=0;index<MAX_KEY;index++){ ;6fkG/T  
  if(hCallWnd[index]==0){ |n01T_Z)P  
   hCallWnd[index]=hWnd; je_77G(F  
   HotKey[index]=cKey; b]hRmW  
   HotKeyMask[index]=cMask; =1VY/sv  
   bAdded=TRUE; SDA +XnmH  
   KeyCount++; hYb!RRGn  
   break; /bt@HFL|`  
  } {;f` t3D  
 } XfViLBY( >  
 return bAdded; gAv?\9=a)W  
} 'ZL)-kbI  
AGLzA+6M  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "%,zB_ng\<  
{ b:Rl }"a  
 BOOL bRemoved=FALSE; %#/7Tl:  
 for(int index=0;index<MAX_KEY;index++){ ;,Lq*x2s  
  if(hCallWnd[index]==hWnd){ s8 .oS);`  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ hCW8(Zt  
    hCallWnd[index]=NULL; @ mt v2P`  
    HotKey[index]=0; 2=["jP!B  
    HotKeyMask[index]=0; KhXW5hS1  
    bRemoved=TRUE; &NHIX(b6  
    KeyCount--; D2>=^WP6+  
    break; e)cmZ8~S  
   } w`F}3zm  
  } top3o{ 4  
 } wy:.  
 return bRemoved; 2s|[!:L5  
} R0oP##]  
@>X."QbE  
void VerifyWindow() y])xP%q2 O  
{ k3S**&i!CR  
 for(int i=0;i<MAX_KEY;i++){ ]7h&ZF  
  if(hCallWnd!=NULL){ A n/)|B4  
   if(!IsWindow(hCallWnd)){ ZLE4 XB]  
    hCallWnd=NULL; AD*+?%hj  
    HotKey=0; ~|l>bf  
    HotKeyMask=0; lYQcQ*-  
    KeyCount--; zcIZJVYA  
   } r4!zA-{  
  } ]%>;R^HY  
 } o] )qv~o)  
} VNXB7#ry  
@105 @9F  
BOOL CHookApp::InitInstance() CIO&VK  
{ R^%7|  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); NBUM* Z  
 hins=AfxGetInstanceHandle(); \iu2rat^  
 InitHotkey(); t)$>++i  
 return CWinApp::InitInstance(); PuUqWW'^  
} cN&b$ 8O=%  
y$4,r4cmR|  
int CHookApp::ExitInstance() L.+5`&  
{ K V  4>(  
 VerifyWindow(); ro^Y$;G  
 UnInit(); bG2 !5m4L  
 return CWinApp::ExitInstance(); ?=Ma7 y  
} "b-6kM  
R:^GNra;  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file b4oZ@gVR;  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) F =d L#@^  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ X1tAV>k5'L  
#if _MSC_VER > 1000 9FJU'$FN  
#pragma once h +N75  
#endif // _MSC_VER > 1000 $Iqt c)DA  
T][\wyLx1  
class CCaptureDlg : public CDialog 7CrWsQl u  
{ ==UH)o`?8  
 // Construction XXxX;xz$  
 public: 9-}&znLZe  
  BOOL bTray; 15Yy&9D  
  BOOL bRegistered; s- g[B(  
  BOOL RegisterHotkey(); o6B!ikz 8  
  UCHAR cKey; sx*(JM}Be  
  UCHAR cMask; s {$c8  
  void DeleteIcon(); LLaoND6  
  void AddIcon(); ,+zLFQC0@  
  UINT nCount; ZFz>" vt@  
  void SaveBmp(); ~w4aA<2Uq  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 9at7$Nq  
  // Dialog Data ~~'XY(\L@  
  //{{AFX_DATA(CCaptureDlg) ;uR8pz e  
  enum { IDD = IDD_CAPTURE_DIALOG }; rpDH>Hzq  
  CComboBox m_Key; D&Ngg)_Mq  
  BOOL m_bControl; TxPP{6t  
  BOOL m_bAlt; (W*yF2r  
  BOOL m_bShift; o7]h;Zg5r  
  CString m_Path; w;>]L.n  
  CString m_Number; U/0NN>V  
  //}}AFX_DATA "QGP]F  
  // ClassWizard generated virtual function overrides |D`Zi>lv  
  //{{AFX_VIRTUAL(CCaptureDlg) y5+-_x,  
 public: {9'"!fH  
  virtual BOOL PreTranslateMessage(MSG* pMsg); `|v0@-'$  
 protected: - DL/Hk_r  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support f[h=>O  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =We}&80 x  
  //}}AFX_VIRTUAL .o.@cLdU  
  // Implementation jf.ikxm  
 protected: }JrM!'  
  HICON m_hIcon; ~mmI] pC  
  // Generated message map functions 0+cRUH9Ew  
  //{{AFX_MSG(CCaptureDlg) ]O&TU X@)  
  virtual BOOL OnInitDialog(); qX-Jpi P  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); hMi!H.EX.  
  afx_msg void OnPaint(); f-4<W0%  
  afx_msg HCURSOR OnQueryDragIcon(); ad i5h  
  virtual void OnCancel(); s~M!yuH  
  afx_msg void OnAbout();  :jB(!XH  
  afx_msg void OnBrowse(); s+Ln>c'|o  
  afx_msg void OnChange(); w;r -TLf  
 //}}AFX_MSG ?ew^%1!W.  
 DECLARE_MESSAGE_MAP() \=,+weGw@  
}; e J2[=L'  
#endif SQa.xLU  
`I_%`15>  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~>s^/`|?  
#include "stdafx.h" < ~x5{p  
#include "Capture.h" FW[<;$  
#include "CaptureDlg.h" IExQ}I  
#include <windowsx.h> l|j&w[c[Q0  
#pragma comment(lib,"hook.lib") D zl#[|q  
#ifdef _DEBUG P{rJG '  
#define new DEBUG_NEW * Oyic3F  
#undef THIS_FILE HHa7Kh|-H  
static char THIS_FILE[] = __FILE__; +(UrqK4Av  
#endif C=%go1! $  
#define IDM_SHELL WM_USER+1 8m-jU 5u  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ruF+X)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); od?Q&'A  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; AvP*p{we  
class CAboutDlg : public CDialog 6t/})Xv  
{ E(]yjZ/  
 public: bKG:_mWe w  
  CAboutDlg(); ~g>15b3  
  // Dialog Data |w /txn8G|  
  //{{AFX_DATA(CAboutDlg) *~2jP;$  
  enum { IDD = IDD_ABOUTBOX }; n1buE1r?  
  //}}AFX_DATA R/<  /g=  
  // ClassWizard generated virtual function overrides = eTI@pN`  
  //{{AFX_VIRTUAL(CAboutDlg) +`.%aJIi9  
 protected: -+Quw2465^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `C_#EU-  
  //}}AFX_VIRTUAL dpE\eXoa,  
  // Implementation {&w%3  
 protected: }wj*^>*  
  //{{AFX_MSG(CAboutDlg) "Z}0A/y  
  //}}AFX_MSG #;}IHAR  
  DECLARE_MESSAGE_MAP() .' D+De&y  
}; POUB{ba  
;#fB=[vl";  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) gEU)UIJ  
{ 6sB!m|zm]:  
 //{{AFX_DATA_INIT(CAboutDlg) K2:r7f  
 //}}AFX_DATA_INIT ]DC]=F.  
} rYN`u  
k_O"bsI)  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) LUS7-~:F  
{ 90I)"vfW5  
 CDialog::DoDataExchange(pDX); '>'h7F=tY  
 //{{AFX_DATA_MAP(CAboutDlg) EkWe6m  
 //}}AFX_DATA_MAP Z''Fz(qMC  
} !i}G>*XH,  
t6-c{ZX>A  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) |W*f 6F3  
 //{{AFX_MSG_MAP(CAboutDlg) !!Mp;h'}-  
 // No message handlers 8a. |CgI#h  
 //}}AFX_MSG_MAP T7cT4PAW  
END_MESSAGE_MAP() =CRaMjN  
B;W=61d  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) e/@udau  
: CDialog(CCaptureDlg::IDD, pParent) Yn1U@!  
{ \EB]J\ x<  
 //{{AFX_DATA_INIT(CCaptureDlg) h`3;^T  
  m_bControl = FALSE; )-9|3`  
  m_bAlt = FALSE; uVOpg]8d  
  m_bShift = FALSE; ZpI_/  
  m_Path = _T("c:\\");  _%i|*  
  m_Number = _T("0 picture captured."); ufEt"P-X.  
  nCount=0; D8[&}D4  
  bRegistered=FALSE; ?ADk`ts~,}  
  bTray=FALSE; 1T}|c;fc  
 //}}AFX_DATA_INIT B;1wnKdj  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >KGQ#hnH  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); @$+l ^"#-]  
} #)cRD#0  
Im6ymaf9  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 5:n&G[Md  
{ sPc\xY  
 CDialog::DoDataExchange(pDX); y7,~7f!N2  
 //{{AFX_DATA_MAP(CCaptureDlg) r<C^hs&]  
  DDX_Control(pDX, IDC_KEY, m_Key); o~es> ;  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ~Ycz(h'(  
  DDX_Check(pDX, IDC_ALT, m_bAlt); e$F7wto  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); L=HL1Qe$G]  
  DDX_Text(pDX, IDC_PATH, m_Path); -6t# ?Dkc'  
  DDX_Text(pDX, IDC_NUMBER, m_Number); rw+0<r3|K  
 //}}AFX_DATA_MAP nR"k %$  
} /0SPRf}p  
|U7{!yy%MF  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 3P-#NL  
//{{AFX_MSG_MAP(CCaptureDlg) &Lq @af#  
 ON_WM_SYSCOMMAND() O]{H2&k@  
 ON_WM_PAINT() BLMcvK\9  
 ON_WM_QUERYDRAGICON() BKvF,f/g  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) j#!J hi  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) s/ZOA[Yux  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 5l(;+#3y/  
//}}AFX_MSG_MAP OtQKDpJq  
END_MESSAGE_MAP() UK& E#i  
G ROl9xp2  
BOOL CCaptureDlg::OnInitDialog() b[RBp0]x  
{ ]]d@jj  
 CDialog::OnInitDialog(); {' r(P&  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8oA6'%.e  
 ASSERT(IDM_ABOUTBOX < 0xF000); WNL3+  
 CMenu* pSysMenu = GetSystemMenu(FALSE); }[i35f[w  
 if (pSysMenu != NULL) xZ9y*Gv\=  
 { \V: _Zs  
  CString strAboutMenu; {MYlW0)~  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 4eIu@ ";!  
  if (!strAboutMenu.IsEmpty()) 6e~+@S  
  { j&8 ~X2?*  
   pSysMenu->AppendMenu(MF_SEPARATOR); WQ"ZQ  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #NL1N_B  
  } zROyG  
 } DlIfr6F  
 SetIcon(m_hIcon, TRUE); // Set big icon Pu axS  
 SetIcon(m_hIcon, FALSE); // Set small icon @uH7GW}$g  
 m_Key.SetCurSel(0); Y`( I};MO  
 RegisterHotkey(); dHOz;4_  
 CMenu* pMenu=GetSystemMenu(FALSE); bXC 0f:L  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); e,1Jxz4QH  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); T 6phD8#  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); K h% x  
 return TRUE; // return TRUE unless you set the focus to a control bk^ :6>{K  
} ]]`+aF0  
D 3Int0n  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 1/1P;8F@G  
{ aG=Y 6j G  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) VQo7 se1P  
 { 7c;59$2(  
  CAboutDlg dlgAbout; @d4zSG/s5w  
  dlgAbout.DoModal(); ao7|8[  
 } oMMU5sm  
 else m41n5T`  
 { [N7[%iQ%  
  CDialog::OnSysCommand(nID, lParam); AvV.faa  
 } 1bj75/i<6  
} 1U"Y'y2  
lfI[r|  
void CCaptureDlg::OnPaint() "_q5\]z\O  
{ u)Y#&qA  
 if (IsIconic()) 9`09.`U9[  
 { \t!+]v8f8  
  CPaintDC dc(this); // device context for painting 3:=XU9p)x  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); *]Vx=7 D  
  // Center icon in client rectangle ^i:%;oeG  
  int cxIcon = GetSystemMetrics(SM_CXICON); Ke 'bH  
  int cyIcon = GetSystemMetrics(SM_CYICON); C2Y&qX,  
  CRect rect; +d'h20  
  GetClientRect(&rect); EB> RY+\  
  int x = (rect.Width() - cxIcon + 1) / 2; MuO>O97  
  int y = (rect.Height() - cyIcon + 1) / 2; .s2d  
  // Draw the icon  ^5 ;Y  
  dc.DrawIcon(x, y, m_hIcon); 1/#N{rZ  
 } eY&UFe  
 else <D4)gRRo  
 { +Z{ 4OJK  
  CDialog::OnPaint(); 3q1O:b^eo  
 } J-\b?R a  
} 7rhpIP2n  
I=3q#^}[  
HCURSOR CCaptureDlg::OnQueryDragIcon() EO| kiC   
{ `_v-Y`Z  
 return (HCURSOR) m_hIcon; S?8q.59  
} `I'=d4  
q_oYI3  
void CCaptureDlg::OnCancel() Ap97Zcw  
{ wh~~g qi9  
 if(bTray) m?M(79u[  
  DeleteIcon(); ]j{S' cz  
  CDialog::OnCancel(); 5T8!5EcS*  
} UiYA#m  
*~:@xMa  
void CCaptureDlg::OnAbout() <edAWc+  
{ H%%#^rb^  
 CAboutDlg dlg; %[p[F~Z^Z  
 dlg.DoModal(); XhIgzaGVu  
} -Xd/-,zPY  
qc`_&!*D  
void CCaptureDlg::OnBrowse() ZE=~ re  
{ ipbVQ7  
 CString str; [C d 2L&9  
 BROWSEINFO bi; U9N}6a=  
 char name[MAX_PATH]; %NAz(B  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); @Sv  ?Ar  
 bi.hwndOwner=GetSafeHwnd(); ;^ /9sLW?#  
 bi.pszDisplayName=name; x]{h$yI  
 bi.lpszTitle="Select folder"; ]gmf%g'C  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ?Rl*5GRW  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]1Q\wsB  
 if(idl==NULL) <R !qOQI  
  return; Hh qx)u  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); + S%+Ku  
 str.ReleaseBuffer(); +h9CcBd  
 m_Path=str; Ak9W8Z}  
 if(str.GetAt(str.GetLength()-1)!='\\') 4ErDGYg}  
  m_Path+="\\"; }e@j(*8  
 UpdateData(FALSE); _6(zG.Fg  
} {+r?g J  
\|T0@V  
void CCaptureDlg::SaveBmp() D(r|sw  
{ <T7y85  
 CDC dc; N.isvDk%  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); J#X7Ss  
 CBitmap bm; 3~ZtAgih%  
 int Width=GetSystemMetrics(SM_CXSCREEN); :X$&g sT/,  
 int Height=GetSystemMetrics(SM_CYSCREEN); 4wBCs0NIm  
 bm.CreateCompatibleBitmap(&dc,Width,Height); `9wz:s QtP  
 CDC tdc; =1esUO[nx  
 tdc.CreateCompatibleDC(&dc); Ri-I+7(n!  
 CBitmap*pOld=tdc.SelectObject(&bm); o0<T|zgF5,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); d[o =  
 tdc.SelectObject(pOld); _zpn+XVdQ  
 BITMAP btm; IC{>q3  
 bm.GetBitmap(&btm); kv'n W  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {Qhv HV  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); rzO:9# d  
 BITMAPINFOHEADER bih; Gpgi@ Uf  
 bih.biBitCount=btm.bmBitsPixel; Dn6DkD!  
 bih.biClrImportant=0; O&O1O> [p1  
 bih.biClrUsed=0; :#gz)r  
 bih.biCompression=0; OOv"h\,  
 bih.biHeight=btm.bmHeight; *v 8 ]99N  
 bih.biPlanes=1; -J[D:P.Z  
 bih.biSize=sizeof(BITMAPINFOHEADER); a.Mp1W  
 bih.biSizeImage=size; ;pULJ}rDb  
 bih.biWidth=btm.bmWidth; O}KT>84M  
 bih.biXPelsPerMeter=0; "`3H0il;<  
 bih.biYPelsPerMeter=0; W"2\vo)  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); p(U'Ydl~  
 static int filecount=0; n&Al~-Q:^  
 CString name; ZRX>SyM  
 name.Format("pict%04d.bmp",filecount++); opIcSm&  
 name=m_Path+name; 0CDTj,eK  
 BITMAPFILEHEADER bfh; t>25IJG  
 bfh.bfReserved1=bfh.bfReserved2=0; $OUa3!U_!  
 bfh.bfType=((WORD)('M'<< 8)|'B'); <&x_e-;b'  
 bfh.bfSize=54+size; ", |wG7N K  
 bfh.bfOffBits=54; V)0bLR  
 CFile bf; DL~LSh  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 4$|G$h  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #Y{"`5>  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); &FK=w]P  
  bf.WriteHuge(lpData,size); k5ZwGJ#r  
  bf.Close(); l'o}4am  
  nCount++; P/ y-K0u  
 } :}GxJT4  
 GlobalFreePtr(lpData); f9&D1Gh+w  
 if(nCount==1)  Cn_Mz#Z  
  m_Number.Format("%d picture captured.",nCount); |C(72t?K  
 else "qDEI}  
  m_Number.Format("%d pictures captured.",nCount); gF%ad=xm  
  UpdateData(FALSE); <<A@69"4n  
} JN8k x;@  
JTb<uC  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) @lJGdp  
{ oZ8SEC "]  
 if(pMsg -> message == WM_KEYDOWN) =9)ypI-2  
 { Onc!5L  
  if(pMsg -> wParam == VK_ESCAPE) BHK_=2WYz  
   return TRUE; vAVoFL  
  if(pMsg -> wParam == VK_RETURN) &R8zuD`#  
   return TRUE; 5q) Eed  
 } {<]abO  
 return CDialog::PreTranslateMessage(pMsg); :WxMv~e{U  
} RSnK`N\9jb  
/stED{j,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }5]NUxQ_  
{ *i n_Z t3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ HK-?<$Yc  
  SaveBmp(); l,/5$JGnk  
  return FALSE; $@U`zy"Y  
} @vv`86bm  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ UtWoSFZ'o!  
 CMenu pop; !BY=HFT  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); AX&1-U  
 CMenu*pMenu=pop.GetSubMenu(0); iFHVr'Og'  
 pMenu->SetDefaultItem(ID_EXITICON); $:xUXEi{  
 CPoint pt; S\ li<xl  
 GetCursorPos(&pt); Dho~6K }"  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); &/ zs Ix+  
 if(id==ID_EXITICON) N2~z&y8.  
  DeleteIcon(); *i\7dJ Dj  
 else if(id==ID_EXIT) 0qTa @y  
  OnCancel(); 'Gc6ZSLM  
 return FALSE; B02~/9*Y"  
} )V>FU=  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); :N[2*.c[  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) .O,gl$y}  
 AddIcon(); # I<G:)  
 return res; 0}b8S48|?  
} V}J W@  
95+}NJ;r  
void CCaptureDlg::AddIcon() \l[5U3{  
{ #F9$"L1Hg  
 NOTIFYICONDATA data; @-7K~in?^  
 data.cbSize=sizeof(NOTIFYICONDATA); T0SD|'  
 CString tip; Z$pR_dazU  
 tip.LoadString(IDS_ICONTIP); C qxP@  
 data.hIcon=GetIcon(0); x##Iv|$  
 data.hWnd=GetSafeHwnd(); ce;9UBkOg2  
 strcpy(data.szTip,tip); `"bm Hs7  
 data.uCallbackMessage=IDM_SHELL; XRz.R/  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ` Y ut 1N  
 data.uID=98; p"X\]g^jA>  
 Shell_NotifyIcon(NIM_ADD,&data); VJNPs6  
 ShowWindow(SW_HIDE); L,l+1`Jz  
 bTray=TRUE; ;m&f Vp  
} Jsw<,uT D  
l p? h~  
void CCaptureDlg::DeleteIcon() I,#U _  
{ G +YF  
 NOTIFYICONDATA data; J LeV@NO  
 data.cbSize=sizeof(NOTIFYICONDATA); G%6wk=IH  
 data.hWnd=GetSafeHwnd(); [OT@gp:  
 data.uID=98; >!oN+8[~  
 Shell_NotifyIcon(NIM_DELETE,&data); T"0a&.TLj  
 ShowWindow(SW_SHOW); 9!R!H&  
 SetForegroundWindow(); ^ ]B&7\w"t  
 ShowWindow(SW_SHOWNORMAL); "W1q}4_  
 bTray=FALSE; ;;U2I5 M7  
} 2AlLcfAW  
P "%/  
void CCaptureDlg::OnChange() [oYe/<3  
{ \myj Y  
 RegisterHotkey(); P EbB0GL  
}  KL|B| u  
8!T^KMfz  
BOOL CCaptureDlg::RegisterHotkey() kg-%:;y.  
{ mtF&Z\ag  
 UpdateData(); z1"UF4x*  
 UCHAR mask=0; Gis'IX(  
 UCHAR key=0; 4RzG3CJdS  
 if(m_bControl) GY4yZa  
  mask|=4; e;gf??8}  
 if(m_bAlt) P(Lwpa,S  
  mask|=2; {jv1hKTa  
 if(m_bShift) S#""((U$  
  mask|=1; CsE|pXVG  
  key=Key_Table[m_Key.GetCurSel()]; HPgMVp'  
 if(bRegistered){ D_8hn3FH  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Jv7M[SJ#x  
  bRegistered=FALSE; |Rl|Th  
 } W]R5\ G*  
 cMask=mask; gG $o8c-  
 cKey=key; R vY`9D  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); q2SkkY$_]y  
 return bRegistered; 5 Fd]3  
} X~j A*kmAj  
7/~"\nN:/  
  四、小结 N* z<VZ  
|e\:0O?  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
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