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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: yZYK wKG  
  L`9TB"0R+  
  一、实现方法 UL86-R!  
 L5"8G,I  
  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: N\9}\Rk@  
3iE-6udCS  
#pragma data_seg("shareddata") ZCy`2Fir  
HHOOK hHook =NULL; //钩子句柄 4$yV%[j  
UINT nHookCount =0; //挂接的程序数目 (k%GY< bP  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 %1Bn_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 XB0a dp  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey &qJPwO  
static int KeyCount =0; weNzYMf%  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 duX0Mc. 0P  
#pragma data_seg() TT'Ofvdc  
MaZM%W8Z  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 r& vFikIz  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: P @zz"~f7  
 }10\K  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ,Pn-ZF  
cKey,UCHAR cMask) (2UW_l  
{ z0#-)AeS  
 BOOL bAdded=FALSE; HbcOTd)=5  
 for(int index=0;index<MAX_KEY;index++){ fJaubDxa  
  if(hCallWnd[index]==0){ J.#(gFBBl\  
   hCallWnd[index]=hWnd; ]b3/Es+  
   HotKey[index]=cKey; ,eR8 ~(`=  
   HotKeyMask[index]=cMask; 6SE6AL<b  
   bAdded=TRUE; y8G&Wg aCi  
   KeyCount++; P Q7A~dw9  
   break; Y4d3n  
  } XMGx ^mn  
 } /QQ8.8=5  
 return bAdded; LH4>@YPGE#  
} Ng\/)^  
//删除热键 C)NC&fV  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lWW+5  
{ CJJD@=  
 BOOL bRemoved=FALSE; wMGk!N  
 for(int index=0;index<MAX_KEY;index++){ O7%2v@j|8  
  if(hCallWnd[index]==hWnd){ >*IN  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ rah,dVE]  
    hCallWnd[index]=NULL; }.p<wCPy6  
    HotKey[index]=0; + :Vrip  
    HotKeyMask[index]=0; /D<"wF }@J  
    bRemoved=TRUE; _5mc('  
    KeyCount--; f\fdg].!  
    break; |'tW=  
   } @5WgqB  
  } r!7Y'|  
 } 3{KR {B#L  
 return bRemoved; ] /+D^6  
} %?bcT[|3  
u_PuqRcs  
0n.S,3|  
  DLL中的钩子函数如下: P.djd$#  
QdQ d(4/1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) f;gZ|a  
{ 'Gjq/L/x  
 BOOL bProcessed=FALSE; &rp!%]+xAM  
 if(HC_ACTION==nCode) RPVT*`o  
 { P"1 S$oc  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 [8"ojhdV  
   switch(wParam) #Z\ O}<  
   {  Cp#)wxi6[y  
    case VK_MENU: A3HF,EG  
     MaskBits&=~ALTBIT; {XgnZ`*  
     break; 5o#Yt  
    case VK_CONTROL: FW8-'~  
     MaskBits&=~CTRLBIT; rz%<AF Z  
     break; \ p4*$  
    case VK_SHIFT: -?<4Og[^  
     MaskBits&=~SHIFTBIT; V >Hf9sZ  
     break; ;#TaZN  
    default: //judge the key and send message l?/Y  
     break; !Vheq3"q/  
   } RW_q~bA9  
   for(int index=0;index<MAX_KEY;index++){ 1S0pd-i  
    if(hCallWnd[index]==NULL) 4,G w#@  
     continue; |ETiLR=&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ][d,l\gu+s  
    { y:d{jG^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;gMgj$mI  
     bProcessed=TRUE; F[saP0 *  
    } n,j$D62[  
   } /4$4h;_8  
  } M\oTZ@  
  else if((lParam&0xc000ffff)==1){ //有键按下 Sw8kIC  
   switch(wParam) WA$ JI@g  
   { ^N{ltgQY  
    case VK_MENU: u=r`t(Z1H  
     MaskBits|=ALTBIT; [Il~K  
     break; /\Z J   
    case VK_CONTROL: e8}Ezy"^  
     MaskBits|=CTRLBIT; MgJ36zM  
     break; $Z?\>K0i  
    case VK_SHIFT: #?[.JD51l  
     MaskBits|=SHIFTBIT; `TtXZ[gP}  
     break; mM/i^zT  
    default: //judge the key and send message |.P/:e9  
     break;  Fl3#D7K  
   } WKmbNvN^  
   for(int index=0;index<MAX_KEY;index++){ AW,OH SXh6  
    if(hCallWnd[index]==NULL) w!SkWS b,~  
     continue; J:j<"uPm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T[?6[,.  
    { PUdM[-zjh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); M2@b1;  
     bProcessed=TRUE; -x`G2i  
    } M+`H g_#Q  
   } xd-XWXc  
  } !}KqB8;  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 )US:.7A[.  
   for(int index=0;index<MAX_KEY;index++){ 2+o |A  
    if(hCallWnd[index]==NULL) o.-C|IXG  
     continue; |J0Q,F]T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) k(%QIJH  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); q o 1lj"P  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 l4y{m#/  
   } pS[KBQ"F  
  } {/<6v. v  
 } tMp=-"  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); RDM`9&V!jp  
} c+dg_*^  
RthT \%R  
  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: WO</Mw  
LN2D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); AVw%w&|%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 17.x0 gW,  
|=a}iU8  
  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: J#2!ZQE 3  
? 1*m,;Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) N#C1-*[C  
{ Q@@v1G\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) _7T@5\b:;  
 { up '  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 wJ<Oo@snm  
  SaveBmp(); 5S{7En~zUE  
  return FALSE; !ZRs;UZ>o  
 } o>/O++7Ra  
 …… //其它处理及默认处理 ]rN5Ao}2  
} `Y=WMNy  
*i{Y9f8  
f.B>&%JRZ  
  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。 clw%B  
A"5z6A4WB  
  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。 $,>@o=)_  
9Z5D\yv?H  
  二、编程步骤 3q:n'PC)C  
SLfFqc+n0  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 'CZa3ux  
X|D!VX>#!  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; YW \0k5[  
R%D'`*+  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; U$dh1;  
gk[{2HgN  
  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; VdSv  
<"D=6jqZ  
  5、 添加代码,编译运行程序。 P^`duZ{T  
-u!FOD/  
三、程序代码 %M|,b!eF  
>>i@r@  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL A5'NGt  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) k67a'pmyJ  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ wa=uUM_4u^  
#if _MSC_VER > 1000 3@Z#.FV~C[  
#pragma once  7R#+Le)  
#endif // _MSC_VER > 1000 _p-t<ytnh  
#ifndef __AFXWIN_H__ vsWHk7 9  
#error include 'stdafx.h' before including this file for PCH E37<"(;  
#endif @+F4YJmB?l  
#include "resource.h" // main symbols S [h];eM  
class CHookApp : public CWinApp %ek'~  
{ Eodn/  
 public: fb~=Y$|  
  CHookApp(); p[lNy{u~M  
  // Overrides $;M:TpX  
  // ClassWizard generated virtual function overrides p!O(Y6QM  
  //{{AFX_VIRTUAL(CHookApp) |2\{z{?  
 public: m'\2:mDu0  
  virtual BOOL InitInstance(); <<](XgR(  
  virtual int ExitInstance(); mkh"Kb*{  
  //}}AFX_VIRTUAL ?{w3|Ef&  
  //{{AFX_MSG(CHookApp) -Y Bd, k3  
  // NOTE - the ClassWizard will add and remove member functions here. 'bld,Do6  
  // DO NOT EDIT what you see in these blocks of generated code ! G0u LmW70  
  //}}AFX_MSG CC\*?BKj"  
  DECLARE_MESSAGE_MAP() 3p2P= T  
}; "<_0A f]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); I):!`R.,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m-^ 8W[r+_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'TH15r@  
BOOL InitHotkey(); 6hZ@;Q=b  
BOOL UnInit(); T,xPSN2A*  
#endif *_E|@y  
x3qW0K8  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. pj4!:{.;  
#include "stdafx.h" \Y6WSj?E  
#include "hook.h" 9% l%  
#include <windowsx.h> Yt|6 X:l  
#ifdef _DEBUG YEkh3FrbwH  
#define new DEBUG_NEW 63`{.yZ*z  
#undef THIS_FILE V-n&oCS+f  
static char THIS_FILE[] = __FILE__; &B! o,qp  
#endif +w@M~?>  
#define MAX_KEY 100 2C{H$ A,pW  
#define CTRLBIT 0x04 C2Xd?d  
#define ALTBIT 0x02 jM-)BP6f4  
#define SHIFTBIT 0x01 1]IQg;q  
#pragma data_seg("shareddata") l]~n3IK"  
HHOOK hHook =NULL; `wF8k{Pb  
UINT nHookCount =0; WDFjp  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey FnJ?C&xK  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ;nC.fBu  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey V=fEPM  
static int KeyCount =0; it]E-^2>  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift p!k7C&]E  
#pragma data_seg() b'6- dU%  
HINSTANCE hins; 5_XV%-wM  
void VerifyWindow(); xss`Y,5?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) !mWiYpbU+  
//{{AFX_MSG_MAP(CHookApp) yG Wnod'  
// NOTE - the ClassWizard will add and remove mapping macros here. ` PYJ^I0  
// DO NOT EDIT what you see in these blocks of generated code! /Uo y/}!  
//}}AFX_MSG_MAP =K{\p`?  
END_MESSAGE_MAP() cUTE$/#s  
%QKZT=}  
CHookApp::CHookApp() Y"OG@1V;8  
{ GA7}K:LP'k  
 // TODO: add construction code here, 1x,[6H  
 // Place all significant initialization in InitInstance \(t@1]&jw  
} hs tbz  
Gmf B  
CHookApp theApp; u,}{I}x_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~ek$C  
{ z<B8mB  
 BOOL bProcessed=FALSE; `--TP  
 if(HC_ACTION==nCode) A^q[N  
 { j"AU z)x  
  if((lParam&0xc0000000)==0xc0000000){// Key up r}uz7}z %"  
   switch(wParam) z25m_[p2  
   { gJ2>(k03y  
    case VK_MENU: l NQcYv  
     MaskBits&=~ALTBIT; l}$ U])an#  
     break; R(n^)^?  
    case VK_CONTROL: E ;<l(.Ar  
     MaskBits&=~CTRLBIT;  o x+ 3U  
     break; >y Y'7Ey  
    case VK_SHIFT: gi 0W;q  
     MaskBits&=~SHIFTBIT; 0P\$ 2lk  
     break; Z*-g[8FO  
    default: //judge the key and send message P-ri=E}>  
     break; TDd{.8qf  
   } 6xD#?  
   for(int index=0;index<MAX_KEY;index++){ s}N#n(  
    if(hCallWnd[index]==NULL) * S=\l@EW  
     continue; &3yD_P_3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %/9 EORdeH  
    { v@e~k-#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); IpP~Uz  
     bProcessed=TRUE; Ug&,Y/tFw2  
    } 7O, U?p  
   } 61xs%kxb..  
  } ~ o1x;Y6  
  else if((lParam&0xc000ffff)==1){ //Key down 271&i  
   switch(wParam) 6M13f@v  
   { -eX5z  
    case VK_MENU: >Wz;ySEz  
     MaskBits|=ALTBIT; msVO H%wH  
     break; @xB*KyUW  
    case VK_CONTROL: sJ]taY ou  
     MaskBits|=CTRLBIT; ;A#`]-i C  
     break; [,TkFbDq"J  
    case VK_SHIFT: JwJ7=P=c  
     MaskBits|=SHIFTBIT; }d<}FJ-,  
     break; ve\X3"p#  
    default: //judge the key and send message 1UKg=A-q  
     break; F^hBtfz  
   } $z+8<?YD  
   for(int index=0;index<MAX_KEY;index++) `F/Tv 5@L  
   { |Pg@M  
    if(hCallWnd[index]==NULL) {#)0EzV6  
     continue; 6 ~ >FYX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e^O(e  
    { qu|B4?Y/CR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .|/~op4;  
     bProcessed=TRUE; /PLn+-  
    } #lkM=lY'  
   } cq$i  
  } QcgfBsv96  
  if(!bProcessed){  |jM4E$  
   for(int index=0;index<MAX_KEY;index++){ !ET~KL!  
    if(hCallWnd[index]==NULL) [ :zO}r:  
     continue; )KP5Wud X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) F{UP;"8'  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); e @IA20  
   } 3;a<_cE*@  
  } }Q";aU0^  
 } u;`U*@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *6} N =Z  
} hcyM6:}  
/c,(8{(O  
BOOL InitHotkey() -=(!g&0  
{ Dq)j:f#QM  
 if(hHook!=NULL){ s M+WkN}{  
  nHookCount++; e6!LSx}y  
  return TRUE; tzs</2 G,  
 } {c (!;U  
 else f4BnX(1u  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); "I QlVi  
  if(hHook!=NULL) f"St&q>[s  
   nHookCount++; O)"gS!,  
  return (hHook!=NULL); aJcf`<p   
} 95z]9UL  
BOOL UnInit() Y*! qG  
{ 2z|*xS'G  
 if(nHookCount>1){ &o<F7U'R  
  nHookCount--; EI^06q4x  
  return TRUE; 3mOtW%Hl  
 } H=\3Jj(4  
 BOOL unhooked = UnhookWindowsHookEx(hHook); I}t#%/'YA  
 if(unhooked==TRUE){ }X=[WCK U  
  nHookCount=0; IV)<5'v  
  hHook=NULL; I6Ce_|n ?k  
 } "U\4:k`:  
 return unhooked; Jej` ;I  
} _vZ"4L+Iw+  
!&"<oPjr+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >$ e9igwe  
{ C?2' +K  
 BOOL bAdded=FALSE; $_x^lr  
 for(int index=0;index<MAX_KEY;index++){ mVR P~:+  
  if(hCallWnd[index]==0){ bP^Je&nS*  
   hCallWnd[index]=hWnd; NM06QzE  
   HotKey[index]=cKey; ZfB " E  
   HotKeyMask[index]=cMask; YJo["Q  
   bAdded=TRUE; E>}4$q[r  
   KeyCount++; X_7UJ jFw"  
   break; 3}/&w\$  
  } T,VY.ep/  
 } DS'n  
 return bAdded; ~}+Hgi  
} oIefw:FE,a  
;vIrGZV<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Y_QH&GZ  
{ [3!~PR]  
 BOOL bRemoved=FALSE; d.P\fPSD  
 for(int index=0;index<MAX_KEY;index++){ l'3pQ;  
  if(hCallWnd[index]==hWnd){ zA1lca0HK  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -*XCxU'  
    hCallWnd[index]=NULL; nI*v820,  
    HotKey[index]=0; rW0FA  
    HotKeyMask[index]=0; 'UYR5Y>  
    bRemoved=TRUE; kbMYMx.[  
    KeyCount--; Oj^,m.R  
    break; ]X^rU`":  
   } t8dm)s[r8  
  } PoT`}-9  
 } |P%DkM*X  
 return bRemoved; D &/L:  
} pi ,eIm  
o5Q{/  
void VerifyWindow() IzpZwx^3''  
{ 8A+SjJ4$  
 for(int i=0;i<MAX_KEY;i++){ GO^_=EMR[  
  if(hCallWnd!=NULL){ G rk@dZI  
   if(!IsWindow(hCallWnd)){ 7=DjI ~  
    hCallWnd=NULL; ]~E0gsq  
    HotKey=0; tz&y*e&  
    HotKeyMask=0; aG 92ay  
    KeyCount--; afb+GA!  
   } Q !(pE&  
  } a$Cdhx !  
 } |lkNi  
} `^4vT3e  
-Q U^c2  
BOOL CHookApp::InitInstance() $n^gmhp  
{ NvvUSyk\;s  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;asP4R=  
 hins=AfxGetInstanceHandle(); Q J7L7S  
 InitHotkey(); l!g]a2x*  
 return CWinApp::InitInstance(); $.[#0lCI  
} kVy\b E0o  
a@0BBihz  
int CHookApp::ExitInstance() 6%VV,$p  
{ gw}Mw  
 VerifyWindow(); ~mR'Q-hi<  
 UnInit(); >z.<u|r2  
 return CWinApp::ExitInstance(); ?|ZTaX6A  
} Ed ,D8ND  
4M^G`WA}t9  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file D7S'*;F  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) `8Lo{P  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Z%n(O(^L  
#if _MSC_VER > 1000 ZE/o?4k*c1  
#pragma once FTeu~<KpM  
#endif // _MSC_VER > 1000 $O*O/ iG  
xQp|;oW;z  
class CCaptureDlg : public CDialog ]hbyELs  
{ ._+J_ts  
 // Construction -G|G_$9  
 public: /0eYMG+K=  
  BOOL bTray; rQaxr!  
  BOOL bRegistered; W[}s o6  
  BOOL RegisterHotkey(); "|HDGA5  
  UCHAR cKey; HuV J\%.  
  UCHAR cMask; R%c SJ8O#  
  void DeleteIcon(); XB_B4X1R  
  void AddIcon(); Jzp#bgq}|  
  UINT nCount; MG{YrX)oi  
  void SaveBmp(); HX6Ma{vBk  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor &|`C)6[C  
  // Dialog Data kGN+rHo   
  //{{AFX_DATA(CCaptureDlg) "&%#!2  
  enum { IDD = IDD_CAPTURE_DIALOG }; h)Ff2tX  
  CComboBox m_Key; !0dNQ[$82  
  BOOL m_bControl; A+UU~?3y  
  BOOL m_bAlt; ?K3(D;5 &i  
  BOOL m_bShift; Rv/Bh< t  
  CString m_Path; kWrp1`  
  CString m_Number; Usta0Ag  
  //}}AFX_DATA uZ=NSbYsA  
  // ClassWizard generated virtual function overrides H/"lAXfb  
  //{{AFX_VIRTUAL(CCaptureDlg) v%RP0%%{s  
 public: A2n qf^b{#  
  virtual BOOL PreTranslateMessage(MSG* pMsg); is@b&V]  
 protected: M_%B|S {  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support l3IWoa&sh  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); >(snII  
  //}}AFX_VIRTUAL bl'z<S, '  
  // Implementation <~)kwq'  
 protected: jH6&q~#  
  HICON m_hIcon; J;prC  
  // Generated message map functions @ G4X  
  //{{AFX_MSG(CCaptureDlg) Q[d}J+l4{  
  virtual BOOL OnInitDialog(); ku..aG`  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); hnznp1[#@  
  afx_msg void OnPaint(); wGZR31  
  afx_msg HCURSOR OnQueryDragIcon(); \{EpduwZ  
  virtual void OnCancel(); &wB\ ~Ie-  
  afx_msg void OnAbout(); :(H>2xS,s  
  afx_msg void OnBrowse(); Zx d~c]n  
  afx_msg void OnChange(); Z*FrB58  
 //}}AFX_MSG K_ ci_g":  
 DECLARE_MESSAGE_MAP() C*G=cs\i  
}; D3x/OyG(  
#endif q@jq0D)g  
k`x=D5s\  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Y OJ6 w  
#include "stdafx.h" x1BobhU~Zl  
#include "Capture.h" [S@}T zE  
#include "CaptureDlg.h" 0V!l,pg  
#include <windowsx.h> 1DA1N<'  
#pragma comment(lib,"hook.lib") {Ions~cO)  
#ifdef _DEBUG T_lsGu/  
#define new DEBUG_NEW Tc+gdo>G  
#undef THIS_FILE h/,${,}J  
static char THIS_FILE[] = __FILE__; .&x}NYX4  
#endif VnT>K9&3  
#define IDM_SHELL WM_USER+1 SnYLdwgl  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .T*GN|@$!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5IbJ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; gp-T"l  
class CAboutDlg : public CDialog nIvJrAm4k  
{ Z'k|u4ZC  
 public: 5H9r=a  
  CAboutDlg(); C -?!S  
  // Dialog Data :#lIx%l  
  //{{AFX_DATA(CAboutDlg) ${8?N:>t  
  enum { IDD = IDD_ABOUTBOX }; 4Ua> Yw0  
  //}}AFX_DATA 1lpwZ"  
  // ClassWizard generated virtual function overrides -&e92g&n   
  //{{AFX_VIRTUAL(CAboutDlg) 42\-~]  
 protected: Nlj^D m  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support q SejLh6  
  //}}AFX_VIRTUAL /N-_FMl?  
  // Implementation ,Hgc-7g@Y  
 protected: $ F S_E  
  //{{AFX_MSG(CAboutDlg) 1LY8Ma]E  
  //}}AFX_MSG c~o+WI Ym  
  DECLARE_MESSAGE_MAP() M+!x}$ &v  
}; w%zRHf8C  
:>81BuMvg  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) b,IocD6v;P  
{ .{S8f#p9T  
 //{{AFX_DATA_INIT(CAboutDlg) efY8M2  
 //}}AFX_DATA_INIT wap3Kd>MP  
} _e7-zg$/  
[qoXMuC|P  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) dgo3'ZO  
{ 2:LHy[{5  
 CDialog::DoDataExchange(pDX); _qWliw:0#  
 //{{AFX_DATA_MAP(CAboutDlg) Gc$gJnQio  
 //}}AFX_DATA_MAP WX4;l(P L=  
} y4Er @8I`  
vs j3  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ayBRWT0  
 //{{AFX_MSG_MAP(CAboutDlg) AE@NOM7u  
 // No message handlers Urgtg37  
 //}}AFX_MSG_MAP TH&qX  
END_MESSAGE_MAP() 5IKL#V `3a  
5#E |R  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) wJlX4cT4YV  
: CDialog(CCaptureDlg::IDD, pParent) pN&c(=If  
{ m~'? /!!  
 //{{AFX_DATA_INIT(CCaptureDlg) Yh)Isg|0>  
  m_bControl = FALSE; :L 3&FA   
  m_bAlt = FALSE; sFDG)  
  m_bShift = FALSE; W~Z<1[  
  m_Path = _T("c:\\"); a83g\c5   
  m_Number = _T("0 picture captured."); <*EZ@XoN>  
  nCount=0; n$(p-po  
  bRegistered=FALSE; b|5w]<?'  
  bTray=FALSE; Xes|[*Y!V  
 //}}AFX_DATA_INIT |7@O( $b  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 AddeaB5<  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ejXMKPE;  
} *U#m+@\0  
-]:G L>b  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 7'N S9|  
{ [\Qr. 2  
 CDialog::DoDataExchange(pDX); cubUq5  
 //{{AFX_DATA_MAP(CCaptureDlg) \x >65;  
  DDX_Control(pDX, IDC_KEY, m_Key); O3o: qly!  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); $t-n'Qh^2  
  DDX_Check(pDX, IDC_ALT, m_bAlt); jtm?z c  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ~}DQT>7$  
  DDX_Text(pDX, IDC_PATH, m_Path); ,1/}^f6  
  DDX_Text(pDX, IDC_NUMBER, m_Number); .C]cK%OO N  
 //}}AFX_DATA_MAP 3^=+gsc  
} B%\gkl  
5HS~op2n/  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) q*)+K9LRk  
//{{AFX_MSG_MAP(CCaptureDlg) rbqo"g`  
 ON_WM_SYSCOMMAND() ,LOQDIyn  
 ON_WM_PAINT() N]YtLa,t  
 ON_WM_QUERYDRAGICON() Jg$xO@.  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Ei({`^  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 23DJV);g8  
 ON_BN_CLICKED(ID_CHANGE, OnChange) s0hBbL0DH  
//}}AFX_MSG_MAP Rb}KZ+o "Z  
END_MESSAGE_MAP() <a le$[  
gBk5wk_j|  
BOOL CCaptureDlg::OnInitDialog() M*pRv  
{ =22ALlxk  
 CDialog::OnInitDialog(); A 699FQ  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); c3 &m9zC  
 ASSERT(IDM_ABOUTBOX < 0xF000); as"N=\N  
 CMenu* pSysMenu = GetSystemMenu(FALSE); tK%c@gGU9  
 if (pSysMenu != NULL) <EO<x D=:  
 { FnHi(S|A  
  CString strAboutMenu; 8X?>=tl  
  strAboutMenu.LoadString(IDS_ABOUTBOX); %G3sjnI;l  
  if (!strAboutMenu.IsEmpty()) xeTgV&$@  
  { l|/:Ot  
   pSysMenu->AppendMenu(MF_SEPARATOR); <1~^C  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %"A_!<n@*`  
  } [{&jr]w`|  
 } q\9d6u=Gm  
 SetIcon(m_hIcon, TRUE); // Set big icon I]}>|  
 SetIcon(m_hIcon, FALSE); // Set small icon 8Og3yFx[rt  
 m_Key.SetCurSel(0); ~=y3Gd B3  
 RegisterHotkey(); !#?kWAU  
 CMenu* pMenu=GetSystemMenu(FALSE); J0220 _  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); z"F*\xa  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); =fyyqb 4  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); eR!G[Cw-  
 return TRUE; // return TRUE unless you set the focus to a control @=uN\) 1  
} $1*3!}_0  
gH:ArfC  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Wf>^bFb"$  
{ 7]2 2"mc  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) d @rs3Q1z  
 { t"s5\;IJ  
  CAboutDlg dlgAbout; UU@fkk  
  dlgAbout.DoModal(); 8}BBOD  
 } PoD^`()FR{  
 else '=cKU0 G#  
 { `EMi0hm&H  
  CDialog::OnSysCommand(nID, lParam); *i<\iMoW  
 } (%< 'A  
} ]re'LC!d  
%c6E-4b  
void CCaptureDlg::OnPaint() "<l<& qp  
{ G5'_a$  
 if (IsIconic()) W."f 8ow  
 { -)w]a{F  
  CPaintDC dc(this); // device context for painting :mv`\  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); _dU P7H (  
  // Center icon in client rectangle Nf?\AK!  
  int cxIcon = GetSystemMetrics(SM_CXICON); LAZVW</  
  int cyIcon = GetSystemMetrics(SM_CYICON); [>w%CY<Fd  
  CRect rect; 5 d ;|=K  
  GetClientRect(&rect); h{]#ag5`  
  int x = (rect.Width() - cxIcon + 1) / 2; b1!@v+  
  int y = (rect.Height() - cyIcon + 1) / 2; uMFV% +I  
  // Draw the icon E8/rZ~0O~  
  dc.DrawIcon(x, y, m_hIcon); ehOs9b  
 } ^b53}f8H  
 else _ 6:ww/  
 { %cW;}Y[?P  
  CDialog::OnPaint(); J4yt N3  
 } QB1M3b  
} Q_}/ Pn$1  
; Zq/eiB  
HCURSOR CCaptureDlg::OnQueryDragIcon() }e=e",eAT  
{ )mkS5j`5\  
 return (HCURSOR) m_hIcon; MD'>jO;n  
} YU\Gj S~>&  
\{PNwF?  
void CCaptureDlg::OnCancel() <d@pmh  
{ {j6g@Vd6lx  
 if(bTray) -i_En^Fi  
  DeleteIcon(); ~b8a^6:R"  
  CDialog::OnCancel(); &(O06QL  
} kfj%  
v*P[W_.  
void CCaptureDlg::OnAbout() \p6 }  
{ v["3  
 CAboutDlg dlg; T"W9YpZ  
 dlg.DoModal(); eF1.VLI  
} yDtOpM8<{  
$pFk"]=  
void CCaptureDlg::OnBrowse() f9'] jJ+  
{ 6q%ed UED  
 CString str; }aZr ou3E  
 BROWSEINFO bi; sb'p-Mj  
 char name[MAX_PATH]; K+mU_+KRp  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); R`Qp d3  
 bi.hwndOwner=GetSafeHwnd(); sx-F8:Qa  
 bi.pszDisplayName=name; c)3O/`  
 bi.lpszTitle="Select folder"; KO-a; [/  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ;c)! @GoA  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); od,tfLw4  
 if(idl==NULL) p\+6"28{_~  
  return; pF='jj51  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); @"8~Y|L93  
 str.ReleaseBuffer(); 8_iHVc;<  
 m_Path=str; t F/nah  
 if(str.GetAt(str.GetLength()-1)!='\\') .&(8(C  
  m_Path+="\\"; 4e/cqN 6  
 UpdateData(FALSE); sV'v* 1|  
} 9Dq.lr^  
U_*3>Q  
void CCaptureDlg::SaveBmp() yqBa_XPV8  
{ l"L+e!B~  
 CDC dc; KnFQ)sX^  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ITn;m  
 CBitmap bm; [|<EDR  
 int Width=GetSystemMetrics(SM_CXSCREEN); yiO31uQt  
 int Height=GetSystemMetrics(SM_CYSCREEN); qvTKfIl{  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Ws>i)6[  
 CDC tdc; 6!RikEAh  
 tdc.CreateCompatibleDC(&dc); -aN":?8(G  
 CBitmap*pOld=tdc.SelectObject(&bm); irmwc'n]  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); cUC17z2D  
 tdc.SelectObject(pOld); O#PwRud$  
 BITMAP btm; xPvRQ  
 bm.GetBitmap(&btm); x@ 6\Ob  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Jy`G]]?  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); \-G5l+!  
 BITMAPINFOHEADER bih; eE,;K1  
 bih.biBitCount=btm.bmBitsPixel; J=P;W2L  
 bih.biClrImportant=0; pe#*I/)b  
 bih.biClrUsed=0; Yhk6Uog{4  
 bih.biCompression=0; 2+&R" #I  
 bih.biHeight=btm.bmHeight; r./z,4A`  
 bih.biPlanes=1; #4q1{)=  
 bih.biSize=sizeof(BITMAPINFOHEADER); '^B3pR:  
 bih.biSizeImage=size; 1<ehV VP   
 bih.biWidth=btm.bmWidth; zP|*(*  
 bih.biXPelsPerMeter=0; lrn+d$!@  
 bih.biYPelsPerMeter=0; J=V yyUB  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 2 mq%|VG'  
 static int filecount=0; QqjTLuN  
 CString name; ?N2X)Y@yi  
 name.Format("pict%04d.bmp",filecount++); /KP_Vc:g2_  
 name=m_Path+name; b.,$# D{p  
 BITMAPFILEHEADER bfh; !?n50  
 bfh.bfReserved1=bfh.bfReserved2=0; 4)E|&)-fu8  
 bfh.bfType=((WORD)('M'<< 8)|'B'); d v[\.T`LY  
 bfh.bfSize=54+size; J 5- rp|  
 bfh.bfOffBits=54; F_ _H(}d  
 CFile bf; mf~Lzp  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ X,&xhSzg?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); {\luieG  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Y 0]Kl^\A  
  bf.WriteHuge(lpData,size); 4UazD_`'  
  bf.Close(); -g<cinNSp  
  nCount++; L-MiaKcL  
 } pr)K{~m]{<  
 GlobalFreePtr(lpData); #a.\P.{L  
 if(nCount==1) Kf&r21h  
  m_Number.Format("%d picture captured.",nCount); S8vx[<  
 else F[(6*/46x  
  m_Number.Format("%d pictures captured.",nCount); BM.-X7)  
  UpdateData(FALSE); :;<\5Oy ^  
} 1=ip ,D  
sD.6"w7}  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ?{n>EvLY  
{ b_ypsGE]5!  
 if(pMsg -> message == WM_KEYDOWN) "u,sRbL  
 { tw]/,>\G  
  if(pMsg -> wParam == VK_ESCAPE) {QW-g  
   return TRUE; #,)P N @P  
  if(pMsg -> wParam == VK_RETURN) 3^'#ny?l  
   return TRUE; &1 oaZY w  
 } o;*]1  
 return CDialog::PreTranslateMessage(pMsg); %OuX`w=  
} )2#vhMpdN  
.r(^h/IF  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) h1E PaL  
{ FBcm;cjH  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ M,ppCHy/$  
  SaveBmp(); ?C FS}v  
  return FALSE; TJE% U0Ln  
} {$3j/b  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ |}%(6<  
 CMenu pop; 9y;y7i{>?  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); p[_Yi0U  
 CMenu*pMenu=pop.GetSubMenu(0); i+U@\:=  
 pMenu->SetDefaultItem(ID_EXITICON); M9h<}mh\  
 CPoint pt; HUK" OH  
 GetCursorPos(&pt); (K<Z=a  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Tln9q0"W  
 if(id==ID_EXITICON) w< v1 N  
  DeleteIcon(); _F3KFQ4,S-  
 else if(id==ID_EXIT) `B:B7Cpvn  
  OnCancel(); CGCQa0  
 return FALSE; u0wn=Dg  
} iJEB ?y  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); vuAQm}A4'g  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0T1HQ  
 AddIcon(); jC#`PA3m=  
 return res; H\ {E%7^h-  
} o?;F.W_  
VjC*(6<Gj  
void CCaptureDlg::AddIcon() 7 kEx48  
{ Oi6f8*,  
 NOTIFYICONDATA data; P= &'wblm?  
 data.cbSize=sizeof(NOTIFYICONDATA); 2%`^(\y  
 CString tip; D!c1;IHZ  
 tip.LoadString(IDS_ICONTIP); wwo(n$!\  
 data.hIcon=GetIcon(0); j!6elzg  
 data.hWnd=GetSafeHwnd(); n9N#&Q"7m  
 strcpy(data.szTip,tip); $+A%ODv  
 data.uCallbackMessage=IDM_SHELL; 'y'T'2N3  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &b 5T&-C<  
 data.uID=98; vYYS .ve  
 Shell_NotifyIcon(NIM_ADD,&data); dK[*  
 ShowWindow(SW_HIDE); _{[k[]  
 bTray=TRUE; MV% :ES?  
} +Gk! t]dy  
'2 w XV;`  
void CCaptureDlg::DeleteIcon() ,}eRnl\  
{ sM #!Xl;  
 NOTIFYICONDATA data; V h Z=,m  
 data.cbSize=sizeof(NOTIFYICONDATA); .WBI%ci  
 data.hWnd=GetSafeHwnd(); x-w`KFS  
 data.uID=98; j2< !z;2  
 Shell_NotifyIcon(NIM_DELETE,&data); eo>/  
 ShowWindow(SW_SHOW); dCa}ITg  
 SetForegroundWindow(); [q|?f?Zl  
 ShowWindow(SW_SHOWNORMAL); cWgbd^J  
 bTray=FALSE; unCt4uX^  
} Vf"O/o}hq,  
x{=[w`  
void CCaptureDlg::OnChange() ERUs0na]  
{ z0\;m{TH  
 RegisterHotkey(); GS$ZvO  
} c1pq]mz|z  
aQl?d<|+lk  
BOOL CCaptureDlg::RegisterHotkey() MZ;"J82p  
{ ,Wz[tYL*  
 UpdateData(); +vSCR (n  
 UCHAR mask=0; *p""YEN  
 UCHAR key=0; `G_(xN7O  
 if(m_bControl) Es.toOH$S  
  mask|=4; 73'U#@g6  
 if(m_bAlt)  R4&|t  
  mask|=2; X{5v?4wI  
 if(m_bShift) Q3N y5G>  
  mask|=1; d9`3EP)n  
  key=Key_Table[m_Key.GetCurSel()]; 1mT|o_K{ T  
 if(bRegistered){ cmwzKu%  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3g?MEM~  
  bRegistered=FALSE; ${jA+L<J  
 } Kj~>&WU  
 cMask=mask; XR{5]lKt_  
 cKey=key; v< 65(I>  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); TSc~$Q]  
 return bRegistered; se<i5JsSV  
} =fKhXd  
Hv[d<ylO  
  四、小结 ?&whE!  
DBu)xr}7A  
  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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