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:
2Snb+,o2
G+N1#0,q 一、实现方法
2`*w* Awa| (] 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:
<qfAW?tF FWJ**J #pragma data_seg("shareddata")
4_5f4%S HHOOK hHook =NULL; //钩子句柄
a%.W9=h=M( UINT nHookCount =0; //挂接的程序数目
6&0@k^7~ static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
5@+?{Cl static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
N#Rb8&G)b static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
EA(4xj&:U static int KeyCount =0;
[L2+k?
* static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
w[d8#U #pragma data_seg()
w r"0+J7 <&Xl b0 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。
C<C$df
/V 09Na,N DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
&u[{V R: ymxA<bICS8 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
ld]*J}cw cKey,UCHAR cMask)
:0:Tl/)) {
i<F7/p "- BOOL bAdded=FALSE;
MrB#=3pT for(int index=0;index<MAX_KEY;index++){
OC*28) if(hCallWnd[index]==0){
IrQ.[?C hCallWnd[index]=hWnd;
beo(7,=& HotKey[index]=cKey;
l S,Jo/T@ HotKeyMask[index]=cMask;
2c]"*Pb bAdded=TRUE;
}(8>& KeyCount++;
g>h/|bw4 break;
*gH]R*Q[Rt }
b]b>i]n }
tnobqL' return bAdded;
iGSJ\ }
&PE%tm //删除热键
Lq5xp< BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
`sqr>QD {
uKAI->" BOOL bRemoved=FALSE;
;iuwIdo6c for(int index=0;index<MAX_KEY;index++){
1l$C3c if(hCallWnd[index]==hWnd){
%4m Nk}tyH if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
5?;<^J hCallWnd[index]=NULL;
Qpv#&nfUi6 HotKey[index]=0;
B zS4:e< HotKeyMask[index]=0;
iGhvQmd(/* bRemoved=TRUE;
pi"M*$ KeyCount--;
AMjr[!44 @ break;
}qso} WI }
]Z5m_-I }
R ?iCJ5 m }
Ur#jJR@%3 return bRemoved;
+Mq\3 }
A]!0Z:{h% 9oJM?&i v|(]u3=1_ DLL中的钩子函数如下:
nQmHYOF% $h
pUI LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
%CHw+wT& {
jzV"( p! BOOL bProcessed=FALSE;
\ji\r ]k if(HC_ACTION==nCode)
*|Vf1R] {
sMGo1pG( if((lParam&0xc0000000)==0xc0000000){// 有键松开
_aevaWtEx switch(wParam)
b_RO%L:"yL {
t9U6\ru case VK_MENU:
V?S}%-a MaskBits&=~ALTBIT;
c ^ds|7i]a break;
:|s;2Y case VK_CONTROL:
C33Jzn's MaskBits&=~CTRLBIT;
LH(P<k& break;
B`e/ / case VK_SHIFT:
~\JB)ca. MaskBits&=~SHIFTBIT;
pF8$83S break;
t$n Jmfzm default: //judge the key and send message
$B-/>Rz break;
%TQ4ZFD3 }
1"Oe*@`pV for(int index=0;index<MAX_KEY;index++){
e-y$&[
if(hCallWnd[index]==NULL)
?YR;o4 continue;
Pv5S k8 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
F%-@_IsG# {
`15}jTi SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
+8zACs{p bProcessed=TRUE;
#ae?#?/" }
N 62;@Z\7 }
yZ6WbI8n }
AVQcD`V3B else if((lParam&0xc000ffff)==1){ //有键按下
<&b,%O switch(wParam)
;SU<T^a {
?h4[yp=w case VK_MENU:
xF!IT"5D MaskBits|=ALTBIT;
:bct+J}l~ break;
O80Z7 case VK_CONTROL:
!6-t_S MaskBits|=CTRLBIT;
&D M3/^70 break;
*d C| X case VK_SHIFT:
qY8; k
# MaskBits|=SHIFTBIT;
>KuNHuHu break;
#).^k- default: //judge the key and send message
^5]9B<i[Y break;
hx0 t!k(3 }
zgjgEhnvU for(int index=0;index<MAX_KEY;index++){
8(4!x$,Z5 if(hCallWnd[index]==NULL)
.t\J@?Z continue;
L;opQ~g if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
>P
j#?j*Y {
c9[{P~y SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
\(Rj2 bProcessed=TRUE;
:;Z/$M16B }
y`zdI_!7 }
u W,J5! }
C'[4jz0xF if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
v];YC6shx for(int index=0;index<MAX_KEY;index++){
it H if(hCallWnd[index]==NULL)
@I4HpY7: continue;
9e`};DE if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
;g?PK5rB( SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
%TFsk //lParam的意义可看MSDN中WM_KEYDOWN部分
J'WzEgCnU }
}}k%.Qb }
[,Rc&7p~R }
1sg:8AA return CallNextHookEx( hHook, nCode, wParam, lParam );
_qPKdGoM }
`/T.u&QF 1;~sNSTo 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
eg*a Vb )8^E{w^D} BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
T^^7@\vDI BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
=M?+KbTJ3 !:\0}w$- 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:
q'S[TFMNE q(~jP0pj% LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
/F.<Gz;w {
ROTKK8:+: if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
mxCneX {
*^@b0f~vj //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
!4cCq_ SaveBmp();
Hx+r9w return FALSE;
.^A4w;jPU }
D,..gsg …… //其它处理及默认处理
[gUD + }
rOLZiE T uzQj+Po VOj7Tz9UD 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。
r[ k ,1 H|{ < 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。
yH:p*|% : TqN@l\ 二、编程步骤
v @M6D} 92Gfxld\ 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";
uy2~<) Y!]a*== 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
g
\S6>LG! F\&wFA'J 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;
O6$,J12l S^~"# 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;
q<.k:v& \h[*oeh 5、 添加代码,编译运行程序。
RU/WI<O U= GJuixy 三、程序代码
V(K;Gc umuj> ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
^vh!1"T #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
\'g7oV;>cI #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
wG:RvgX} #if _MSC_VER > 1000
Zt41f PQ #pragma once
N:64Gko"K #endif // _MSC_VER > 1000
>P(.yQ8&kL #ifndef __AFXWIN_H__
"PTEt{qn #error include 'stdafx.h' before including this file for PCH
SD~4CtlfI #endif
j/oc+ M^ #include "resource.h" // main symbols
rgXX,+cO class CHookApp : public CWinApp
q}jh>`d {
|#t^D.j public:
KgYQxEbIW CHookApp();
3bGU;2~} // Overrides
U43U2/^ // ClassWizard generated virtual function overrides
t^Bs3;E^ //{{AFX_VIRTUAL(CHookApp)
Q& d;UVp public:
HqqMX`Rof virtual BOOL InitInstance();
*>aVU' virtual int ExitInstance();
9qi|)!!L //}}AFX_VIRTUAL
0 7qjWo/t //{{AFX_MSG(CHookApp)
g@O?0,+1 // NOTE - the ClassWizard will add and remove member functions here.
ShtV2}s| // DO NOT EDIT what you see in these blocks of generated code !
Ot=nKdP}D //}}AFX_MSG
'Kmf6iK>[ DECLARE_MESSAGE_MAP()
{pXX%> };
(oCpQDab@ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
8rJf2zL BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
pIrL7Pb0 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
.0/"~5 BOOL InitHotkey();
\v:Z;EbX BOOL UnInit();
+5O^{Ce6 #endif
$pPc}M[h $5ea[nc //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
zvnd@y{[ #include "stdafx.h"
/!5cf;kl*l #include "hook.h"
9;*B*S~znW #include <windowsx.h>
DV?c%z`YO #ifdef _DEBUG
_o?aO C #define new DEBUG_NEW
t#f-3zd9 #undef THIS_FILE
FN26f*/ static char THIS_FILE[] = __FILE__;
p;zT #% #endif
/3Y"F"`M. #define MAX_KEY 100
HYdt3GtJ? #define CTRLBIT 0x04
ZBK)rmhMx #define ALTBIT 0x02
\
D>!& #define SHIFTBIT 0x01
x^`P[> #pragma data_seg("shareddata")
[70 _uq HHOOK hHook =NULL;
5<KBMCn UINT nHookCount =0;
ZZ}HgPZ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
=mwAbh)[7n static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
NP\/9
8|1 static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
F6DVq8f9 static int KeyCount =0;
d@ZXCiA}, static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
%Y.@AiViz #pragma data_seg()
{6)H.vpP HINSTANCE hins;
bjwl21;{ void VerifyWindow();
]~3a ~
BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
A]'XC"lS //{{AFX_MSG_MAP(CHookApp)
.db:mSrL // NOTE - the ClassWizard will add and remove mapping macros here.
lUnC+w#[ // DO NOT EDIT what you see in these blocks of generated code!
LChwHkRHJI //}}AFX_MSG_MAP
P
2x.rukT| END_MESSAGE_MAP()
[BKTZQ@G@ DM)Re~* CHookApp::CHookApp()
*g'%5i1ed {
MnY}U",
// TODO: add construction code here,
'./qBJ // Place all significant initialization in InitInstance
r;waT@&C }
{A MAQ ?$\sMkn CHookApp theApp;
s<C66z LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
<pT1p4T< {
Y!u">M#@ BOOL bProcessed=FALSE;
N4yQ,tG>aa if(HC_ACTION==nCode)
HZ{DlH;& {
5C-n"8&C& if((lParam&0xc0000000)==0xc0000000){// Key up
?ZKIs9E[m switch(wParam)
]K5j(1EN {
bM
W}.v! case VK_MENU:
l@<Jp *| MaskBits&=~ALTBIT;
;,KT+!H$ break;
YpSK|( case VK_CONTROL:
S6yLq|W0 MaskBits&=~CTRLBIT;
@, z4{B break;
Q^lgtb case VK_SHIFT:
M~saYJio MaskBits&=~SHIFTBIT;
uF*tlaV6 break;
S U P default: //judge the key and send message
Ao9=TC'v$' break;
kkT=g^D9j }
P=4o)e7E! for(int index=0;index<MAX_KEY;index++){
t.XuH# if(hCallWnd[index]==NULL)
90Z4saSUw continue;
y8di-d3_ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
&xFs0Ri( {
OBM&N SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
S }G3h a bProcessed=TRUE;
F
B&l|#e }
nhq,Y0YH }
eGrxS;NY }
l2
#^}- else if((lParam&0xc000ffff)==1){ //Key down
>lK:~~1 switch(wParam)
4Z{ r {
3)dtl!VMW[ case VK_MENU:
=fK F#^E@ MaskBits|=ALTBIT;
LgSVEQb6\| break;
G'_5UP! case VK_CONTROL:
i"M$hXO MaskBits|=CTRLBIT;
TGG-rA6@Lx break;
Bp=BRl case VK_SHIFT:
(Vy`u)gG MaskBits|=SHIFTBIT;
l\=He break;
w}(Ht_6q{ default: //judge the key and send message
`hl1R3nBM break;
Wl>$<D4mO[ }
AcY! for(int index=0;index<MAX_KEY;index++)
d
a.6Z!a {
>D$NEO^ if(hCallWnd[index]==NULL)
ozG!OiRW continue;
>56;M7b(K if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
5AAPtZ\lH {
NK(; -~{P SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
lHoV>k bProcessed=TRUE;
4,6nk.$yN }
Dj{t[z]$k }
A|0\ct }
n0@ \x=9 if(!bProcessed){
bdyE9t for(int index=0;index<MAX_KEY;index++){
HNL;s5gq if(hCallWnd[index]==NULL)
JsQmn<Yt continue;
v0~*?m4 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
a)M#O\i` SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
- z"D_5 }
l*4_
}
D5fhOq+g }
i<uk} return CallNextHookEx( hHook, nCode, wParam, lParam );
h<f]hJ`ep }
*}N J ]`n6H[6O BOOL InitHotkey()
mwqe@7 {
P'CDV3+ if(hHook!=NULL){
-]vPF| nHookCount++;
Vbpt?1: return TRUE;
zF=E5TL-,4 }
pr"~W8 else
Z^vcODeC$ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
hQDZ%> if(hHook!=NULL)
w}QU;rl8q nHookCount++;
-D30(g{O return (hHook!=NULL);
Mhj.3nN }
km#Rh^ BOOL UnInit()
oSqkAAGz\ {
79Si^n1\ if(nHookCount>1){
tm280 nHookCount--;
`!iVMTp return TRUE;
o;Ma)/P }
9"mcN3x:\e BOOL unhooked = UnhookWindowsHookEx(hHook);
1Igo9rv if(unhooked==TRUE){
ob;$yn7ZO1 nHookCount=0;
6(.]TEu0 hHook=NULL;
\ HZ]=B#0 }
Rd{#cW~ return unhooked;
j; )-K 3Ia }
N| L Ey mg7Q~SLL{ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
q`DilZ]S {
h$y0>eMWs BOOL bAdded=FALSE;
4^rO K for(int index=0;index<MAX_KEY;index++){
J$Nc9?|ZZ if(hCallWnd[index]==0){
nd1%txIsr hCallWnd[index]=hWnd;
ZSg["` HotKey[index]=cKey;
`(7HFq<N HotKeyMask[index]=cMask;
4{oS(Vl! bAdded=TRUE;
Yy:Q/zwo KeyCount++;
an9k2F.) break;
~kAen }
u|a+:r)*4 }
<[mvfw return bAdded;
c'r7sI%Yi }
qdeS*rp\ s9-aPcA BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
F)g.xQ {
92HxZ*t7km BOOL bRemoved=FALSE;
KD5} Nk)t for(int index=0;index<MAX_KEY;index++){
}vLK-Vv if(hCallWnd[index]==hWnd){
=W~K_jE5lo if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
w %sHA hCallWnd[index]=NULL;
Pq:GvM` HotKey[index]=0;
*q.qO )X}3 HotKeyMask[index]=0;
<MH| <hP bRemoved=TRUE;
?YO$NYwE KeyCount--;
cp7Rpqg break;
GGR hM1II }
fhZD[m#D }
;0f?-W?1 }
BejeFV3 return bRemoved;
7 Ed6o }
p;VHg L3g}Z1<!$ void VerifyWindow()
:b_R1ZV|
{
KvrcO#-sL for(int i=0;i<MAX_KEY;i++){
i;
3^vhbQ if(hCallWnd
!=NULL){ ua]>0\D
if(!IsWindow(hCallWnd)){ ]7`)|PJ
hCallWnd=NULL; -gpF%g`H
HotKey=0; hh!^^emo
HotKeyMask=0; .w `1;o
KeyCount--; 'h&"xXv4|
} . !|3a
} phA^ kdW
} $m;rOKVU
} M)oy3y^&
!?7c2QRN
BOOL CHookApp::InitInstance() ag$mc8-p[
{ 6(`Bl$M9
AFX_MANAGE_STATE(AfxGetStaticModuleState()); dm&vLQVS
hins=AfxGetInstanceHandle(); 7]~65@%R-&
InitHotkey(); 5`B!1
return CWinApp::InitInstance(); qdFYf/y
} P7Ws$7x
fQ^45ulz
int CHookApp::ExitInstance() |oSx*Gh
{ :u7y k@
VerifyWindow(); uZ-yu|1
UnInit(); OBY
return CWinApp::ExitInstance(); Q( C\X
} t6u01r{~`
xCOC5f5*@
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file CR-6}T
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ?
D?XaRb
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_
De>'
#if _MSC_VER > 1000 $Y!$I.+
#pragma once _[,oP s:+
#endif // _MSC_VER > 1000 wh\J)pA1
$~V,.RD
class CCaptureDlg : public CDialog 8tM40/U$
{ DJv;ed%x
// Construction Olg@ Ri
public: {/x["2a1
BOOL bTray; 4$+9Wv
BOOL bRegistered; FBYAd@="2
BOOL RegisterHotkey(); RQZ|:SvV
UCHAR cKey; F;mK)Q-
UCHAR cMask; V(%L}0[]
void DeleteIcon(); v}v! hs Q
void AddIcon(); :h>d'+\
UINT nCount; \B'rWk33,
void SaveBmp(); /=zzym~<>
CCaptureDlg(CWnd* pParent = NULL); // standard constructor S?bG U8R5
// Dialog Data tkFGGc}w\
//{{AFX_DATA(CCaptureDlg) wsyG~^>
enum { IDD = IDD_CAPTURE_DIALOG }; n_Ht{2I
CComboBox m_Key; /N`l
z>^~
BOOL m_bControl; TS9=A1J#
BOOL m_bAlt; Ri@`sc{n
BOOL m_bShift; ZX0ZN2 ]
CString m_Path; 6]%79?'A
CString m_Number; &J)q _Z8
//}}AFX_DATA yB&+2
// ClassWizard generated virtual function overrides mr+J#
//{{AFX_VIRTUAL(CCaptureDlg) ydCVG,"
public: R0R Xw
virtual BOOL PreTranslateMessage(MSG* pMsg); w !N;Y0
protected: Xj/U~
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u;xl}
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); xhAORhw#
//}}AFX_VIRTUAL \4RVJ[2
// Implementation ZI
q!ee
protected: kMGK8y
HICON m_hIcon; &95iGL28Q
// Generated message map functions s}]qlg
//{{AFX_MSG(CCaptureDlg) sbZ$h
<
virtual BOOL OnInitDialog(); 7a@%^G @!
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); R6ynL([xh
afx_msg void OnPaint(); }U=|{@%
afx_msg HCURSOR OnQueryDragIcon(); %z6.}4h
virtual void OnCancel(); '1lr "}"Q+
afx_msg void OnAbout(); 5} 9}4e
afx_msg void OnBrowse(); X]J]7\4tF\
afx_msg void OnChange(); 7gR8Wr ^
//}}AFX_MSG "#H@d+u
DECLARE_MESSAGE_MAP() J`T1 88
}; (~~*PT-
#endif AnV\{A^
EK^B=)q6:W
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file V0Cz!YM_3
#include "stdafx.h" b_&;i4[
#include "Capture.h" a1;P2ikuK
#include "CaptureDlg.h" qc}r.'p
#include <windowsx.h> x&6SjlDb$K
#pragma comment(lib,"hook.lib") SMr
]Gf.
#ifdef _DEBUG i2ap]
#define new DEBUG_NEW 3"O)"/"Q.
#undef THIS_FILE CKShz]1
static char THIS_FILE[] = __FILE__; |sN>/89=/
#endif y$VYWcFE
#define IDM_SHELL WM_USER+1 +~O0e-d
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); oT7=
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); SbNs#
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &UhI1mi]h
class CAboutDlg : public CDialog @J~n$^ke
{ o2
=UUD&
public: %RE-_~GF
CAboutDlg(); wD}ojA&DU
// Dialog Data D ];%Ey
//{{AFX_DATA(CAboutDlg) ew(CfW2
enum { IDD = IDD_ABOUTBOX }; ~{,U%B
//}}AFX_DATA WPBn?vb0<
// ClassWizard generated virtual function overrides HS{a^c%
//{{AFX_VIRTUAL(CAboutDlg) sd;J(<Ofh
protected: =H T:p:S
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ys@M1o
//}}AFX_VIRTUAL i5 x[1
// Implementation `T H0*:aI
protected:
?*i qg[:
//{{AFX_MSG(CAboutDlg) bT|NZ!V
//}}AFX_MSG " gB.
DECLARE_MESSAGE_MAP() !`8WNY?K
}; #}50oWE
K1rF;7Y6
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5!2^|y4r
{ *Mf;
//{{AFX_DATA_INIT(CAboutDlg) k}-@N;zq
//}}AFX_DATA_INIT p@H]F<
} Cx $M
<szD"p|K
void CAboutDlg::DoDataExchange(CDataExchange* pDX) o8+ZgXct
{ t?NB#/#%x
CDialog::DoDataExchange(pDX); GzJLG=M
//{{AFX_DATA_MAP(CAboutDlg) a+$WlG/x
//}}AFX_DATA_MAP z4f\0uQ
} x0^O?UR
x!klnpGp
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) i{8T 8
//{{AFX_MSG_MAP(CAboutDlg) r<]Db&k
// No message handlers 4q"x|}a
//}}AFX_MSG_MAP ^h+,Kn0@
END_MESSAGE_MAP() YqsN#E3pf
I^iJ^Z]vx
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) F+A"-k_\T#
: CDialog(CCaptureDlg::IDD, pParent) BU[.P]
{ W2L:
//{{AFX_DATA_INIT(CCaptureDlg) D9H(kk
m_bControl = FALSE; 7^|oO~x6
m_bAlt = FALSE; <3dmY=
m_bShift = FALSE; i6R2R8
m_Path = _T("c:\\"); +I$c+WfU
m_Number = _T("0 picture captured."); 6Z~u2&
nCount=0; Txkmt$h
bRegistered=FALSE; )clSW
bTray=FALSE; ;[%_sVIy
//}}AFX_DATA_INIT #s JE{Tb
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (0s7<&Iu
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); LG6VeYe|\X
} 6QsH?!bu
3L$_OXx
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) -%]O-'
{ %(a<(3r
CDialog::DoDataExchange(pDX); ,}15Cse
//{{AFX_DATA_MAP(CCaptureDlg) 1:<= zqh0
DDX_Control(pDX, IDC_KEY, m_Key); #3@ Du(_n
DDX_Check(pDX, IDC_CONTROL, m_bControl); 2j_YHv$I
DDX_Check(pDX, IDC_ALT, m_bAlt); V eO$n*O
DDX_Check(pDX, IDC_SHIFT, m_bShift); iOpMU
DDX_Text(pDX, IDC_PATH, m_Path); 5~T`R~Uqb
DDX_Text(pDX, IDC_NUMBER, m_Number); BKDs3?&
//}}AFX_DATA_MAP {9sA'5
} 70,V>=aJ
Dm=t`_DL8
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ea3;1-b:
//{{AFX_MSG_MAP(CCaptureDlg) y,&UST
ON_WM_SYSCOMMAND() C3kxw1*
ON_WM_PAINT() m,nZrap
ON_WM_QUERYDRAGICON() NvH9?Ek"
ON_BN_CLICKED(ID_ABOUT, OnAbout) m1x7f%_
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2Y_ `&
ON_BN_CLICKED(ID_CHANGE, OnChange) @xKLRw
//}}AFX_MSG_MAP EL!V\J`S_
END_MESSAGE_MAP() 74YMFI
=a>a A Z
BOOL CCaptureDlg::OnInitDialog() QjH;'OVt
{ fUQuEh5_
CDialog::OnInitDialog(); q[4{Xh
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); y+f@8]
ASSERT(IDM_ABOUTBOX < 0xF000); ( lbF/F>v
CMenu* pSysMenu = GetSystemMenu(FALSE); c"BFkw
if (pSysMenu != NULL) ok;Y xp>
{ M<Mr
L[*j
CString strAboutMenu; j.Ro(0%
strAboutMenu.LoadString(IDS_ABOUTBOX); %VG;vW\V
if (!strAboutMenu.IsEmpty()) d (Ufj|;
{ (9:MIP
pSysMenu->AppendMenu(MF_SEPARATOR); 6@pPaq6
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); L3:dANG
} b_=$W
} K*;e>{p
SetIcon(m_hIcon, TRUE); // Set big icon hn9'M!*:O
SetIcon(m_hIcon, FALSE); // Set small icon (_G&S~@.
m_Key.SetCurSel(0); [+0rlmB
RegisterHotkey(); K#bd b
CMenu* pMenu=GetSystemMenu(FALSE); T^LpoN/T
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); XMb]&VvH
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); nR)/k,3W
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); p2T%Zl_
return TRUE; // return TRUE unless you set the focus to a control % 1Y!|306
} L/Cp\|~ O
g_lj/u]P
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) "?Dov/+Q.
{ D=}UKd
if ((nID & 0xFFF0) == IDM_ABOUTBOX) %H=d_Nm{
{ C?@vBM}
CAboutDlg dlgAbout; 9(?9yFbj5
dlgAbout.DoModal(); Cz=HxU80J
} )cA#2mlS'1
else Jy&O4g/'5
{ [{.e1s<EK
CDialog::OnSysCommand(nID, lParam); +`pS 7d
} gL%%2 }$
} i0`<`qSQh
*0>![v
void CCaptureDlg::OnPaint() ^Rr0)4ns
{ KL:x!GsV5e
if (IsIconic()) \7W>3
{ <a/TDW
CPaintDC dc(this); // device context for painting ,~^0AtLv
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); eELJDSd
BV
// Center icon in client rectangle [fF0Qa-
int cxIcon = GetSystemMetrics(SM_CXICON); r':wq
int cyIcon = GetSystemMetrics(SM_CYICON); gycjIy@t
CRect rect; 9kmEg$WM
GetClientRect(&rect); 0zrgK;9
int x = (rect.Width() - cxIcon + 1) / 2; DG&
({vy
int y = (rect.Height() - cyIcon + 1) / 2; w,hl<=:(FB
// Draw the icon $4K(AEt[
dc.DrawIcon(x, y, m_hIcon); ~WH4D+
} 8:9m< ^4S(
else #+)AIf
{ I&9_F%rX
CDialog::OnPaint(); "YU<CO;4VV
} yuyI)ebC
} GE;S5X]X
H#pl&/+
HCURSOR CCaptureDlg::OnQueryDragIcon() O
<;Au|>*
{ kTQ.7mo/\'
return (HCURSOR) m_hIcon; USgZ%xk2
} up+W[#+
v+a$Xh3Y~
void CCaptureDlg::OnCancel() m80e^
{ G-`4TQ
if(bTray) (Fc\*Vn
DeleteIcon(); *v1M^grKd
CDialog::OnCancel(); NfG<!
} B/"TaXVU
YbaaX{7^
void CCaptureDlg::OnAbout() V<X[>C'
{ l-;u*JA
CAboutDlg dlg; Y,1ZvUOB
dlg.DoModal(); }^|g|xl!
} uTsxSkHb/
>eX&HS oy
void CCaptureDlg::OnBrowse() GM&< ?K1
{ 0$RZ~
CString str; }xZR`xP(
BROWSEINFO bi; +NML>g#F~z
char name[MAX_PATH]; cd_\?7
ZeroMemory(&bi,sizeof(BROWSEINFO)); JbT+w\o
bi.hwndOwner=GetSafeHwnd(); q-7C7q
bi.pszDisplayName=name; P#^-{;Bu
bi.lpszTitle="Select folder"; 5u/d r9n
bi.ulFlags=BIF_RETURNONLYFSDIRS; GyU9,>|~T
LPITEMIDLIST idl=SHBrowseForFolder(&bi); XO[S(q
if(idl==NULL) W5C8$Bqm
return; R8[l\Y>Ec
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?HD(EGdx
str.ReleaseBuffer(); Q-A:0F&{t
m_Path=str; ]=X6*
E*/E
if(str.GetAt(str.GetLength()-1)!='\\') s98Jh(~
m_Path+="\\"; ;#'YO1`gf3
UpdateData(FALSE); _ ~q!<-Z
} .3xpDVW^e
CC{*'p6
void CCaptureDlg::SaveBmp() yT[CC>]l
{ Ew`(x30E
CDC dc; @9,=|kxK
dc.CreateDC("DISPLAY",NULL,NULL,NULL); R]dN-'U
CBitmap bm; }XmrfegF
int Width=GetSystemMetrics(SM_CXSCREEN); s
&4k
int Height=GetSystemMetrics(SM_CYSCREEN); isU7nlc!
bm.CreateCompatibleBitmap(&dc,Width,Height); tX'`4!{@+
CDC tdc; a1^CpeG~
tdc.CreateCompatibleDC(&dc); h%4aL38
CBitmap*pOld=tdc.SelectObject(&bm); "LwLTPC2
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); '6^+|1
tdc.SelectObject(pOld); P{T\zT
BITMAP btm; !H)$_d \uj
bm.GetBitmap(&btm); |nOqy&B
DWORD size=btm.bmWidthBytes*btm.bmHeight; &xhwx>C`K
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); p\;\hHai
BITMAPINFOHEADER bih; jl-2)<
bih.biBitCount=btm.bmBitsPixel; y!z2+q2
bih.biClrImportant=0; 5OHg% ^
bih.biClrUsed=0; [{!K'V
bih.biCompression=0; F~bDA~
bih.biHeight=btm.bmHeight; v,T:V#f^
bih.biPlanes=1; DIqM\ ><
bih.biSize=sizeof(BITMAPINFOHEADER); #%Hk-a=>)#
bih.biSizeImage=size; =g.R?H8cj5
bih.biWidth=btm.bmWidth;
Bf5Z
bih.biXPelsPerMeter=0; QR+xPY~
bih.biYPelsPerMeter=0; e>$d*~mwn
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Y"{L&H `
static int filecount=0; Bb[WtT}=
CString name; RB\
Hl
name.Format("pict%04d.bmp",filecount++); K#"J8h;x
name=m_Path+name; bEQy5AX
BITMAPFILEHEADER bfh; %rFR:w`{
bfh.bfReserved1=bfh.bfReserved2=0; x3>ZO.Q
bfh.bfType=((WORD)('M'<< 8)|'B'); lw\+!}8(
bfh.bfSize=54+size; D_SXxP[! g
bfh.bfOffBits=54; ^"dVz.
CFile bf; I45 kPfu
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ -JKl\ E
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); k kZ2Jxvx
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); UWW^g@d4
bf.WriteHuge(lpData,size); %>p[;>jW
bf.Close(); G_m $?0\
nCount++; ]!c59%f=
} t]3> X
GlobalFreePtr(lpData); 7$"A2x
if(nCount==1) "*U0xnI
m_Number.Format("%d picture captured.",nCount); us5<18M5
else Fe[)-_%G
m_Number.Format("%d pictures captured.",nCount); 1;*4yJ2
UpdateData(FALSE); ;\]&k
} T}}T`Ce
kk`K)PESi
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ^l:~r2
{ `w6*(t:T
if(pMsg -> message == WM_KEYDOWN) (HEi;
{ 3 as~yF0
if(pMsg -> wParam == VK_ESCAPE) cp:U@Nh(
return TRUE; 40e(p/Qka
if(pMsg -> wParam == VK_RETURN) bmOK8
return TRUE; 4,, @o
} 8t;vZ&
return CDialog::PreTranslateMessage(pMsg); 3u 'VPF2
} JRw<v4pZ
vh$If0
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) aZ,j1j0p
{ -lY,lC>{
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ m
>Rdsn~l
SaveBmp(); A_!N,<-
return FALSE; '^n,)oA/G
} .Ei#mG-=}&
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ }WA=
CMenu pop; !.G knDT
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); cMfJq}C<
CMenu*pMenu=pop.GetSubMenu(0); 3jqV/w[-
pMenu->SetDefaultItem(ID_EXITICON); #0"Pd8@
CPoint pt; G$^u2wz.
GetCursorPos(&pt); <(!~s><.
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); \N%L-%^
if(id==ID_EXITICON) :hBLi99
o
DeleteIcon(); aMJW__,
else if(id==ID_EXIT) ~W2Od2p!
OnCancel(); sv.?C pE
return FALSE;
7;I;(iY
} ]Sey|/@D
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 4C#r=Uw`
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 34
'[O
AddIcon(); b$eN]L
return res; 43}uW,P
} { v [
Al3*? H&
void CCaptureDlg::AddIcon() s$JO3-)
{ {/|tVc63
NOTIFYICONDATA data; i*]$_\yl"
data.cbSize=sizeof(NOTIFYICONDATA); dEI]|i
r
CString tip; hcqg94R#_
tip.LoadString(IDS_ICONTIP); R0#'t+7^
data.hIcon=GetIcon(0); \>\_OfY1W
data.hWnd=GetSafeHwnd(); nb\pBl
strcpy(data.szTip,tip); H
-K%F_#
data.uCallbackMessage=IDM_SHELL; [ KDNKK
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; k|^YYi=xF
data.uID=98; KY%LqcC
Shell_NotifyIcon(NIM_ADD,&data); z41v5rB4
ShowWindow(SW_HIDE); NY
GWA4L
bTray=TRUE; m;JB=MZ=m
} v@d]*TG
<^w4+5sT/
void CCaptureDlg::DeleteIcon() C"0vMUZ
{ K8JshFIe
NOTIFYICONDATA data; 5^97#;Q;J"
data.cbSize=sizeof(NOTIFYICONDATA); ~_F <"40
data.hWnd=GetSafeHwnd(); uC! dy
data.uID=98; Lng@'Yr
Shell_NotifyIcon(NIM_DELETE,&data); _]zH4o<p
ShowWindow(SW_SHOW); 8Sk$o.Gy
SetForegroundWindow(); 8
KRo<
ShowWindow(SW_SHOWNORMAL); (]nX:t
bTray=FALSE; Hva/C{Y
} Ftdx+\O_i&
".{'h
void CCaptureDlg::OnChange() oO^=%Mc(
{ yf2P6b\
RegisterHotkey(); p4@0[z'
} g_JSgH!4
FOAXm4"
BOOL CCaptureDlg::RegisterHotkey() 4$y P_3
{ pLe[<N
UpdateData(); I_Omv{&u
UCHAR mask=0; Yw6uh4
UCHAR key=0; [NK&s:wMk
if(m_bControl) Q0%s|8Jc
mask|=4; HPXJRQBE
if(m_bAlt) uE}$ZBiq
mask|=2; z~th{4#E;
if(m_bShift) C{>dE:*K^
mask|=1; fizL_`uMqb
key=Key_Table[m_Key.GetCurSel()]; iEx4va-j
if(bRegistered){ 25;(`Td5
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 2Z-QVwa*U
bRegistered=FALSE; P7epBWqDP
} L1kAAR
cMask=mask; T7^?j :kJ/
cKey=key; M0t9`Z9
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 9/=+2SZ
return bRegistered; i}O.,iH
} G8.nKoHv7x
G0h e'BR
四、小结 d+nxvh?I8
c=D~hz N
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。