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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: [{!j9E?(  
  u{lDof>  
  一、实现方法 ,tv9+n@x  
Ai_|)  
  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: ) eGu4iEPM  
02 c.;ka3  
#pragma data_seg("shareddata") [Jh))DIx  
HHOOK hHook =NULL; //钩子句柄 >fzzrD}]  
UINT nHookCount =0; //挂接的程序数目 kFZu/HRI  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 >zx50e)  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 u.K'"-xt4K  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 'FA)LuAok  
static int KeyCount =0; . eag84_  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 eRqexqO!  
#pragma data_seg() ,["|wqM  
d~1"{WPSn  
  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。 'N,NG$G2  
6Oqnb+  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: D30Z9_^%:  
%m\G'hY2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR LVcy.kU@]  
cKey,UCHAR cMask) ppo$&W &z  
{ H=SMDj)s+  
 BOOL bAdded=FALSE; :x5o3xE  
 for(int index=0;index<MAX_KEY;index++){ wTuRo J  
  if(hCallWnd[index]==0){ bFdg '_  
   hCallWnd[index]=hWnd; d~bH!P  
   HotKey[index]=cKey; mbG^fy'  
   HotKeyMask[index]=cMask; WF.$gBH"  
   bAdded=TRUE; 8_,wOkk_B  
   KeyCount++; DdZ_2B2  
   break; Fu$Gl$qV?%  
  } ]` Gz_e  
 } QR"O)lP  
 return bAdded; n_ NG~ /x  
} 27i<6PAC[A  
//删除热键 %B un@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [-94=|S @  
{ iW%0pLn  
 BOOL bRemoved=FALSE; ,7$uh):  
 for(int index=0;index<MAX_KEY;index++){ Dq1XZ%8  
  if(hCallWnd[index]==hWnd){ %1d6j<7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ hnL gsz  
    hCallWnd[index]=NULL; 7}7C0mV3  
    HotKey[index]=0; BCDf9]X  
    HotKeyMask[index]=0; ]qG5 Ne _  
    bRemoved=TRUE; n~cm?"  
    KeyCount--; <yaw9k+P  
    break; IG@&l0ARL  
   } 0_Z|y/I.  
  }  Jy[8,X  
 } aZ0iwMK  
 return bRemoved; N0KRND  
} ?U[nYp}"v  
$W]guG  
TZ_'nB~  
  DLL中的钩子函数如下: *1]k&#s  
_[Wrd?Z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 6D]G*gwk[  
{ /faP]J)  
 BOOL bProcessed=FALSE; :v ~q  
 if(HC_ACTION==nCode) ~l(tl[  
 { }(I DPaJ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 BJ2W }R  
   switch(wParam) oa|*-nw  
   {  weadY,-H8  
    case VK_MENU: _@?Jx/`;bk  
     MaskBits&=~ALTBIT; p%tg->#L  
     break; 90k|u'ikOp  
    case VK_CONTROL: rSCX$ @@F  
     MaskBits&=~CTRLBIT; `%:(IGxz  
     break; Yzx0[_'u  
    case VK_SHIFT: >V=@[B(0  
     MaskBits&=~SHIFTBIT; ^u&Khc~ y  
     break; WC;a  
    default: //judge the key and send message jmVy4* P_  
     break; \(t>(4s_~  
   } ;AA7wK 4  
   for(int index=0;index<MAX_KEY;index++){ #mxfU>vQ:  
    if(hCallWnd[index]==NULL) ^moIMFl  
     continue; TmH13N]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hds4 _  
    { eTHh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6u3(G j@  
     bProcessed=TRUE; >x0lSL0y  
    } 7}85o J  
   } m)w- mc  
  } -\v8i.w0  
  else if((lParam&0xc000ffff)==1){ //有键按下 3`8xh 9O  
   switch(wParam) $ !=:ES  
   { [<$d@}O  
    case VK_MENU: 8uW:_t]q  
     MaskBits|=ALTBIT; PX/0  jv  
     break; 7u0R=q  
    case VK_CONTROL: 5!p'n#_  
     MaskBits|=CTRLBIT; H5t`E^E  
     break; @x ]^blq  
    case VK_SHIFT: zhL,BTH  
     MaskBits|=SHIFTBIT; ,1+_k ="Z  
     break; 6;V 1PK>9  
    default: //judge the key and send message &h[}5  
     break; p[:%Ck"$7  
   } ZJM^P'r.1c  
   for(int index=0;index<MAX_KEY;index++){ BVeNK=7m%  
    if(hCallWnd[index]==NULL) k;X1x65uP  
     continue; zwK;6&(W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) K7Tell\`  
    { JPKZU<:+V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); qE=OQs9  
     bProcessed=TRUE; Vtk|WV?>P+  
    } bUL9*{>G  
   } '" yl>"  
  } =_3qUcOP  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 vH8%a8V  
   for(int index=0;index<MAX_KEY;index++){ <-aI%'?*  
    if(hCallWnd[index]==NULL) TnAX;+u  
     continue; _ @76eZd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) j)*nE./3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5nb6k,+E  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 6[7k}9`alz  
   } IQv>{h}  
  } F x8)jBB_  
 } ;Nij*-U4~  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); n/D]r  
} 4tTJE<y  
z|H>jit+  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: N Q=YTRU  
Dw,f~D$+ic  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W{aNS@1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c>.Xc[H  
Lcm!e  
  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: BT0hx!Ti  
Gjr2]t;E  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !~v>&bCG>9  
{ (P8oXb+%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) &i RX-)^u  
 { r U5'hK  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 t,nB`g?  
  SaveBmp(); #1R %7*$i  
  return FALSE; rfpxE>_|G  
 } E 3.s8}}  
 …… //其它处理及默认处理 2_v>8B  
} :"]ei@  
$S{j}74[  
cIjsUqKa  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 DcHMiiVM  
z& jDOex  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ~V)E:(  
;_\P;s  
  二、编程步骤 HbVLL`06*  
V;(LeuDH|  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; #C mBgxg+M  
pT tX[CE  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; O2f2Fb$B7  
fO nvC*  
  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; ;wrgpP3  
Jmx }r,j  
  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; lX3h'h  
|e >-v  
  5、 添加代码,编译运行程序。 pM3BBF%  
2oLa`33c1  
三、程序代码 |&7,g  
oJ:J'$W(  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Ags`%(  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) <& iBR  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ (z7#KJ1+Aw  
#if _MSC_VER > 1000 Xg,BK0O  
#pragma once ibyA~YUN/  
#endif // _MSC_VER > 1000 %\0 Y1!Hw  
#ifndef __AFXWIN_H__ KHtY +93  
#error include 'stdafx.h' before including this file for PCH AAcbY;  
#endif |#6Lcz7[  
#include "resource.h" // main symbols P_U-R%f  
class CHookApp : public CWinApp d9"4m>ymS  
{ 4^&vRD,  
 public: ev $eM  
  CHookApp(); 5>Q)8` @E  
  // Overrides u7d]%<~'$F  
  // ClassWizard generated virtual function overrides {,=,0NQKn  
  //{{AFX_VIRTUAL(CHookApp) `>Cx!sYhV  
 public: >^&+,*tsS4  
  virtual BOOL InitInstance(); r8rR_ M{P  
  virtual int ExitInstance(); oV`sCr5%  
  //}}AFX_VIRTUAL T!bu}KO  
  //{{AFX_MSG(CHookApp) X[<9+Q-&  
  // NOTE - the ClassWizard will add and remove member functions here. at!?"u  
  // DO NOT EDIT what you see in these blocks of generated code ! :F&WlU$L  
  //}}AFX_MSG )w-?|2-w5  
  DECLARE_MESSAGE_MAP() CCV~nf  
}; C#>C59  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); tUQ)q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); d/1XL[&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s9iM hCu|  
BOOL InitHotkey(); \BL9}5y  
BOOL UnInit(); @#apOoVW>  
#endif SCij5il%  
VzesqVx  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 5oS\uX|  
#include "stdafx.h" o6 /?WR9  
#include "hook.h" Cmj)CJ-  
#include <windowsx.h> @d\F; o<  
#ifdef _DEBUG "|if<hx+  
#define new DEBUG_NEW 3nO|A: t  
#undef THIS_FILE n>WS@b/o  
static char THIS_FILE[] = __FILE__; XJ;/ kR  
#endif 00i9yC8@6  
#define MAX_KEY 100 N2>JG]G  
#define CTRLBIT 0x04 Xc!w y9m  
#define ALTBIT 0x02 3>+;G4  
#define SHIFTBIT 0x01 mX89^  
#pragma data_seg("shareddata") fvD wg  
HHOOK hHook =NULL; *M:Bhw  
UINT nHookCount =0; ;QYK {3R?  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey U,'n}]=4A3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ArY'NE\Htt  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Z>l>@wNm  
static int KeyCount =0; L6^h3*JyD  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift s6B@:9  
#pragma data_seg() ]G:xTv8  
HINSTANCE hins; m| Z)h{&  
void VerifyWindow(); [C$ 0HW  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) #_d%hr~d  
//{{AFX_MSG_MAP(CHookApp) }1V&(#H2  
// NOTE - the ClassWizard will add and remove mapping macros here. |($pXVLH`  
// DO NOT EDIT what you see in these blocks of generated code! tz,FK;8  
//}}AFX_MSG_MAP ?D_zAh?pW  
END_MESSAGE_MAP() DjIs"5Iei  
k{~5pxd-t  
CHookApp::CHookApp() Y*Pr  
{ 8/:\iPk0  
 // TODO: add construction code here, Q*I/mUP&f  
 // Place all significant initialization in InitInstance "q$M\jK#V  
}  X_lNnk  
nB.p}k  
CHookApp theApp; $IHa]9 {  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) {#vo^& B  
{ SZ_hGD0  
 BOOL bProcessed=FALSE; <\5{R@A*6  
 if(HC_ACTION==nCode) b{&@ Lm0Tn  
 { d1-QkW^0y  
  if((lParam&0xc0000000)==0xc0000000){// Key up b}fH$.V@  
   switch(wParam) +"!IVHY  
   { DsoF4&>g[B  
    case VK_MENU: x-1[2K1"[  
     MaskBits&=~ALTBIT; <x/&Ml+  
     break; ,f$ RE6  
    case VK_CONTROL: @:63OLlrG  
     MaskBits&=~CTRLBIT; >9 iv>  
     break; KvQ9R!V  
    case VK_SHIFT: du !.j  
     MaskBits&=~SHIFTBIT; "jSn`  
     break; sdb#K?l  
    default: //judge the key and send message 7$'ja  
     break; /vu7;xVG  
   } _xJ&p$&  
   for(int index=0;index<MAX_KEY;index++){ _/Hu'9432  
    if(hCallWnd[index]==NULL) "ggq7cJ}_  
     continue; V|7 c dX#H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) yxH[uJpb  
    { mU!c;O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); FQ5# v{  
     bProcessed=TRUE; s[hD9$VB>  
    } W/ERqVZR]  
   } R$q:Ct  
  } m*1=-" P  
  else if((lParam&0xc000ffff)==1){ //Key down 4h|vd.t  
   switch(wParam) C<3An_Dy  
   { ' {Q L`L  
    case VK_MENU: ^#nAS2w7U  
     MaskBits|=ALTBIT; j'Fni4;  
     break; 'G&w[8mqY  
    case VK_CONTROL: K&/W cuP &  
     MaskBits|=CTRLBIT; b{A#P?  
     break; t4h* re+  
    case VK_SHIFT: v"j7},P@  
     MaskBits|=SHIFTBIT; L(.5:&Y=`  
     break; k20tn ew  
    default: //judge the key and send message |K]tJi4fz  
     break; dQ<EDtap  
   } >">-4L17m  
   for(int index=0;index<MAX_KEY;index++) 139_\=5|U/  
   { Y9ru~&/o$  
    if(hCallWnd[index]==NULL) hGsY u)  
     continue; ujaaO6oZ7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o!Y7y1$  
    { MD+Q_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +7=3[K  
     bProcessed=TRUE; B9]KC i  
    } i9d.Ls  
   } S;Vj5  
  } [ACa<U/  
  if(!bProcessed){ um/iK}O  
   for(int index=0;index<MAX_KEY;index++){ 8"+Kz  
    if(hCallWnd[index]==NULL) L!\I>a5C0G  
     continue; ;X8eZQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #jQITS7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); lyP<&<Y5  
   } RJ`F2b sYN  
  } -0Ps. B  
 } '2eggX%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [l0>pHl@  
} OmsNo0OA  
FbF P  
BOOL InitHotkey() (f7R~le  
{ env]*gx+=  
 if(hHook!=NULL){ [j) :2  
  nHookCount++; -{^Gzui  
  return TRUE; vForj*Xo  
 } b^0=X!bg  
 else q%nWBmPZ~y  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); BRzrtK  
  if(hHook!=NULL) 7"1M3P5*8  
   nHookCount++; gkDB8,C<j  
  return (hHook!=NULL); f|u!?NGl  
} >mz<=n  
BOOL UnInit() HZ/e^"cpM  
{ KrB"2e+J  
 if(nHookCount>1){ uZCPxog  
  nHookCount--; L+&$/1h]  
  return TRUE; zpJQ7hym  
 } Zv-#v  
 BOOL unhooked = UnhookWindowsHookEx(hHook); vLq_l4l  
 if(unhooked==TRUE){ (<|,LagTuc  
  nHookCount=0; 3:s!0ty"  
  hHook=NULL; G22u+ua  
 } 'vBuQinn  
 return unhooked; o^mW`g8[  
} #>}cuC@  
t~3!| @3i  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q/I/>6M7UZ  
{ H>% K}Fh  
 BOOL bAdded=FALSE; Pa+%H]vB  
 for(int index=0;index<MAX_KEY;index++){ nwf(`=TC  
  if(hCallWnd[index]==0){ (V&$KDOA  
   hCallWnd[index]=hWnd; xtyOG  
   HotKey[index]=cKey; ^tI ,eZ  
   HotKeyMask[index]=cMask; `Ps&N^[  
   bAdded=TRUE; ?|kwYA$4o  
   KeyCount++; C h>r.OfP  
   break; )m|)cLT&  
  } f]Xh7m(Gh  
 } UZz/v#y~  
 return bAdded; `f S$@{YI_  
} ]@0C1 r  
)1N~-VuT  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2)-Umq{]{  
{ |cs]98FEf  
 BOOL bRemoved=FALSE; 9!; /+P  
 for(int index=0;index<MAX_KEY;index++){ @P@?KZ..v!  
  if(hCallWnd[index]==hWnd){ PKJw%.-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ dSkMA  
    hCallWnd[index]=NULL; }"Clv /3_  
    HotKey[index]=0; Qu|H_<8g  
    HotKeyMask[index]=0; ;0FfP  
    bRemoved=TRUE; ,N93H3(  
    KeyCount--; $i1$nc8  
    break; wNtC5  
   } :<hM@>eFn  
  } ^M0  
 } ]jjHIFX  
 return bRemoved; zc K`hS  
} {u~JR(C:  
]lqLC  
void VerifyWindow() 9(6f:D  
{ 3N257]  
 for(int i=0;i<MAX_KEY;i++){ Lcb5^e?'Q  
  if(hCallWnd!=NULL){ Y7BmW+  
   if(!IsWindow(hCallWnd)){ HAwdu1$8  
    hCallWnd=NULL; 5X&Y~w,poU  
    HotKey=0; 2u Zb2O  
    HotKeyMask=0; _0}u0fk  
    KeyCount--; Ogv9_ X8  
   } >e>%AMzo[  
  } m~04I~8vk  
 } CVE(N/&b  
} 5:|9pe)  
Np7+g`nG  
BOOL CHookApp::InitInstance() tTOBKA89  
{ pmRm&VgE.  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); KrdEB0qh  
 hins=AfxGetInstanceHandle(); 5\V""fH  
 InitHotkey(); KT[ZOtu  
 return CWinApp::InitInstance(); K @RGvP  
} "%lIB{  
xqs ,4bcbY  
int CHookApp::ExitInstance() ox*1F+Xri  
{ .J <t]  
 VerifyWindow(); 0CO@@`~4  
 UnInit(); 9HB+4q[  
 return CWinApp::ExitInstance(); xpX<iT>5u  
} {8>g?4Q#  
_iu~vU)r  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file F42<9)I  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) CFC15/yU  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ I3HO><o f  
#if _MSC_VER > 1000 )pSA|Qt N  
#pragma once t W+"/<U  
#endif // _MSC_VER > 1000 \HXq~Y  
zZ6m`]{B9?  
class CCaptureDlg : public CDialog ,p{naT%R  
{ Dj>eAO>  
 // Construction djH&)&q!  
 public: }y Vx"e)  
  BOOL bTray; :_}xN!9LA  
  BOOL bRegistered; kDol1v`  
  BOOL RegisterHotkey(); Z_[ P7P  
  UCHAR cKey; 4%2APvLW  
  UCHAR cMask; 63'm @oZ  
  void DeleteIcon(); 9#TD1B/  
  void AddIcon(); @R%* ;)*F  
  UINT nCount; tn#cVB3  
  void SaveBmp(); fLnwA|n=  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor O}>@G  
  // Dialog Data l^Ob60)2  
  //{{AFX_DATA(CCaptureDlg) KLvAe>#,  
  enum { IDD = IDD_CAPTURE_DIALOG }; p[w! SR%=  
  CComboBox m_Key; LN~mKoW  
  BOOL m_bControl; ]DKRug5  
  BOOL m_bAlt; Q 9fK)j1$  
  BOOL m_bShift; EB| iW2'  
  CString m_Path; dP?prT  
  CString m_Number; K[kK8i+(  
  //}}AFX_DATA  QEg[  
  // ClassWizard generated virtual function overrides ~Oa$rqu%m  
  //{{AFX_VIRTUAL(CCaptureDlg) eZEk$W%  
 public: fX]`vjM{  
  virtual BOOL PreTranslateMessage(MSG* pMsg); r1}^\C  
 protected: "MU-&**  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <pfl>Uf  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); /v^ '5j1o  
  //}}AFX_VIRTUAL h;,1BpbM  
  // Implementation f-3CDUQ`  
 protected: fGb}V'x}r  
  HICON m_hIcon; md*U  
  // Generated message map functions ,VS(4  
  //{{AFX_MSG(CCaptureDlg) )7 q"l3e"u  
  virtual BOOL OnInitDialog(); FY^2 Y  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Q66 +  
  afx_msg void OnPaint(); eT+i &  
  afx_msg HCURSOR OnQueryDragIcon(); yI1 :L -  
  virtual void OnCancel(); T? Kh '  
  afx_msg void OnAbout(); 1^LdYO?g'  
  afx_msg void OnBrowse(); ("\{=XA Q  
  afx_msg void OnChange(); Ie(i1?`A8  
 //}}AFX_MSG &nDXn|  
 DECLARE_MESSAGE_MAP() a M9v  
}; u8T@W}FX  
#endif uLafO=Q  
w%.hALN5-C  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file X8VBs#tLE  
#include "stdafx.h" /i3 JP}  
#include "Capture.h" )O"E#%  
#include "CaptureDlg.h" Qn7T{ BW  
#include <windowsx.h> '{cSWa| #  
#pragma comment(lib,"hook.lib") Rjq Xz6  
#ifdef _DEBUG ep=r7Mft  
#define new DEBUG_NEW :~ pGHl  
#undef THIS_FILE 3("C'(W  
static char THIS_FILE[] = __FILE__; KEtV  
#endif Sp492W+  
#define IDM_SHELL WM_USER+1 Xd=KBB[r?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); gzIx!sc  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [02rs@c>  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; tGgxID  
class CAboutDlg : public CDialog <Cv(@A->  
{ [K&%l]P7  
 public: [ N|X  
  CAboutDlg(); !{g<RS( c  
  // Dialog Data H}$7c`;q  
  //{{AFX_DATA(CAboutDlg) =}0Uw4ub(u  
  enum { IDD = IDD_ABOUTBOX }; >=[uLY[aK  
  //}}AFX_DATA Up{[baWF  
  // ClassWizard generated virtual function overrides .JPN';  
  //{{AFX_VIRTUAL(CAboutDlg) aOH|[  
 protected: 8 MQq3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Jqj!k*=/  
  //}}AFX_VIRTUAL +b(};(wL  
  // Implementation i'm<{ v  
 protected: 5Jbwl$mZ  
  //{{AFX_MSG(CAboutDlg) &]DB-t#\  
  //}}AFX_MSG D`T;j[SsS#  
  DECLARE_MESSAGE_MAP() #B;P4n3  
}; c,4~zN8Ou  
-g@!\{  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) m<h%BDSzr{  
{ Z^_qXerjP  
 //{{AFX_DATA_INIT(CAboutDlg) !?nbB2,  
 //}}AFX_DATA_INIT hyH[`wiq  
} ysz =Xw  
m+0yf(w  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) dymq Z<  
{ 23wztEp{a  
 CDialog::DoDataExchange(pDX); qD{1X25O  
 //{{AFX_DATA_MAP(CAboutDlg) 5tYo! f  
 //}}AFX_DATA_MAP (-gomn  
} h^SWb9 1"G  
`gX|q3K\s  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) D5,]E`jwu  
 //{{AFX_MSG_MAP(CAboutDlg) oZa'cZNs  
 // No message handlers J,F1Xmr4  
 //}}AFX_MSG_MAP p?i.<Z  
END_MESSAGE_MAP() fOV_ >]u  
,AP0*Ln  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) eX+36VG\  
: CDialog(CCaptureDlg::IDD, pParent) w*-42r3,'  
{ U?UU] >Q  
 //{{AFX_DATA_INIT(CCaptureDlg) (9Zvr4.f7  
  m_bControl = FALSE; YNr"]SA@;  
  m_bAlt = FALSE; B&]`OO>O  
  m_bShift = FALSE; M7TLQqaF  
  m_Path = _T("c:\\"); 2!{D~Gfl=  
  m_Number = _T("0 picture captured."); fB8, )&  
  nCount=0; #7]Jz.S  
  bRegistered=FALSE; ,U~A=bsa  
  bTray=FALSE; h3o'T=`Sm  
 //}}AFX_DATA_INIT suY47DCX)  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 'X;cgAq8(  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); (`1i o  
} G-d7}Uz ?  
hzo> :U  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) G?s9c0f  
{ o;$xN3f,  
 CDialog::DoDataExchange(pDX); 'JOUx_@z  
 //{{AFX_DATA_MAP(CCaptureDlg) ;7'O=%  
  DDX_Control(pDX, IDC_KEY, m_Key); $Zu?Gd?  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); +V4)><  
  DDX_Check(pDX, IDC_ALT, m_bAlt); #*o0n>O  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); QTy=VLk43  
  DDX_Text(pDX, IDC_PATH, m_Path); <T}^:2G|  
  DDX_Text(pDX, IDC_NUMBER, m_Number); .nPOjwEx&Y  
 //}}AFX_DATA_MAP JOJ.79CT  
} XQo\27Fo  
w:5?ofC  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) rfqwxr45h  
//{{AFX_MSG_MAP(CCaptureDlg) S(gr>eC5  
 ON_WM_SYSCOMMAND() cnu&!>8V  
 ON_WM_PAINT() I L*B@E8  
 ON_WM_QUERYDRAGICON() (/A.,8Ad  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) I0m7;M7 P  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 6 9>@0P  
 ON_BN_CLICKED(ID_CHANGE, OnChange) g(@F`W[  
//}}AFX_MSG_MAP ^Hx}.?1  
END_MESSAGE_MAP() e9{ii2M  
$ VT)  
BOOL CCaptureDlg::OnInitDialog() .C'\U[A{  
{ -8 uS#  
 CDialog::OnInitDialog(); 6u, g  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _%e8GWf  
 ASSERT(IDM_ABOUTBOX < 0xF000); e$[O J<t  
 CMenu* pSysMenu = GetSystemMenu(FALSE); , Y:oTo=~  
 if (pSysMenu != NULL) ,Kv6!ib6Q  
 { # EvRm  
  CString strAboutMenu; GW A T0  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Ui'v ' $  
  if (!strAboutMenu.IsEmpty()) t]h_w7!U  
  { 2 R\K!e  
   pSysMenu->AppendMenu(MF_SEPARATOR); 5i[O\@]5  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); &W45.2  
  } Nf| 0O\+%y  
 } 9^a|yyzL  
 SetIcon(m_hIcon, TRUE); // Set big icon Jh-yIk  
 SetIcon(m_hIcon, FALSE); // Set small icon E=I'$*C \D  
 m_Key.SetCurSel(0); ]3 "0#Y  
 RegisterHotkey(); &W\e 5X<A  
 CMenu* pMenu=GetSystemMenu(FALSE); ?MH=8Cl1w  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); `i`P}W!F  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ,;pUBrz/[  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); dcf,a<K\  
 return TRUE; // return TRUE unless you set the focus to a control SY,ns*>1F  
} o@)Fy51DD  
Qw0k-t0=4  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Cff6EE  
{ fEBi'Ad  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) %r^tZ;; l  
 { .#&)%}GC  
  CAboutDlg dlgAbout; tj;47UtH  
  dlgAbout.DoModal(); y4kn2Mw;  
 } 7J);{ &x9h  
 else bW`nLiw}%  
 { wq?"NQ?O<  
  CDialog::OnSysCommand(nID, lParam); %e:+@%]  
 } EID-ROMO  
} F$UL.`X _/  
nvR%Ub x  
void CCaptureDlg::OnPaint() WO>,=^zPJ  
{ #N][-i  
 if (IsIconic()) #6M |T+ =  
 { 5Ew( 0K[  
  CPaintDC dc(this); // device context for painting 6 wN*d 5  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); kX L0  
  // Center icon in client rectangle )7.)fY$  
  int cxIcon = GetSystemMetrics(SM_CXICON); ew\:&"@2]w  
  int cyIcon = GetSystemMetrics(SM_CYICON); &b (*  
  CRect rect; /` M#  
  GetClientRect(&rect); e#oK% {A  
  int x = (rect.Width() - cxIcon + 1) / 2; ]WMzWt:L  
  int y = (rect.Height() - cyIcon + 1) / 2; .i;.5)shsu  
  // Draw the icon LH54J;7 Y  
  dc.DrawIcon(x, y, m_hIcon); `oMZ9Gq2E  
 } a j4ZS  
 else Xm,fyk>  
 { g[~{iu_$d  
  CDialog::OnPaint(); y(DT ^>0  
 } CzlG#?kU?2  
} (PPC?6s  
a<-aE4wdm  
HCURSOR CCaptureDlg::OnQueryDragIcon() _n:RA)4*  
{ uihH")Mo  
 return (HCURSOR) m_hIcon; OG{*:1EP  
} =Htt'""DN  
p-j6H  
void CCaptureDlg::OnCancel() +&\. ]Pp  
{ N_92,xI#  
 if(bTray) {`):X_$T  
  DeleteIcon(); >$ZhhM/} J  
  CDialog::OnCancel(); Tv#d>ZSD  
} ZY<R Nwu  
jTS8 qu  
void CCaptureDlg::OnAbout() k;cIEEdZD  
{ iY>P7Uvvz  
 CAboutDlg dlg; #e.x]v:  
 dlg.DoModal(); w<~[ad}  
} X0L \Ewm  
f@`|2wG  
void CCaptureDlg::OnBrowse() 4M%|N  
{ 8pEA3py  
 CString str; a=W%x{  
 BROWSEINFO bi; Q&0`(okb  
 char name[MAX_PATH]; a( ~X  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -\p&18K#  
 bi.hwndOwner=GetSafeHwnd(); ]-t>F  
 bi.pszDisplayName=name; t<dFH}U`w  
 bi.lpszTitle="Select folder"; gdCit-3  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; mxEe -q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); K bQXH!J  
 if(idl==NULL) yT:2*sZRc  
  return; k5>UAea_  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); tQG'f*4  
 str.ReleaseBuffer(); E!ZLVR.K  
 m_Path=str; uhj]le!  
 if(str.GetAt(str.GetLength()-1)!='\\') HY_>sD  
  m_Path+="\\"; _<]0hC  
 UpdateData(FALSE); q~#>MB}".  
} }Tk:?U{  
0Sk~m4fj(  
void CCaptureDlg::SaveBmp() I~6(>Z{  
{ XzIC~}  
 CDC dc; [f\Jcjc  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); //N="9)@  
 CBitmap bm; J;<dO7j5  
 int Width=GetSystemMetrics(SM_CXSCREEN); _"x%s  
 int Height=GetSystemMetrics(SM_CYSCREEN); T*@o?U  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ]35`N<Ac  
 CDC tdc; \^0>h`[  
 tdc.CreateCompatibleDC(&dc); v .*fJ   
 CBitmap*pOld=tdc.SelectObject(&bm); iz;5:  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); #|8%h  
 tdc.SelectObject(pOld); Id^q!4Th9  
 BITMAP btm; +5I5  
 bm.GetBitmap(&btm); }fk3a9j9u  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ] 7[#K^  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); L8n?F#q  
 BITMAPINFOHEADER bih; QuMv1)n  
 bih.biBitCount=btm.bmBitsPixel; Py #EjF12  
 bih.biClrImportant=0; e wT K2  
 bih.biClrUsed=0; q{}5wM  
 bih.biCompression=0; Q }^Ip7T  
 bih.biHeight=btm.bmHeight; ]%-U~avph  
 bih.biPlanes=1; A`M-N<T  
 bih.biSize=sizeof(BITMAPINFOHEADER); /Z]nV2$n)V  
 bih.biSizeImage=size; LN (\B:wAY  
 bih.biWidth=btm.bmWidth; x>mI$K(6M  
 bih.biXPelsPerMeter=0; L'a+1O1q&i  
 bih.biYPelsPerMeter=0; %m/lPL  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); r [^.\&-  
 static int filecount=0; LEjq<t1&  
 CString name; huA?*fat   
 name.Format("pict%04d.bmp",filecount++); #b&tNZ4!_  
 name=m_Path+name; DazoY&AWE  
 BITMAPFILEHEADER bfh; z &P1C,n)  
 bfh.bfReserved1=bfh.bfReserved2=0; ^ )"Il  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ` ;mQ"lO  
 bfh.bfSize=54+size; Z5oDj|&l}  
 bfh.bfOffBits=54; ^HR8.9^[1u  
 CFile bf; W tw,YFT  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #J3}H   
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); irm4lb5  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); OO?N)IB@  
  bf.WriteHuge(lpData,size); \z2y?"\?  
  bf.Close(); &QD)1b[U  
  nCount++; Z~h6^h   
 } k7@QFw4 j  
 GlobalFreePtr(lpData); ]=ApYg7!  
 if(nCount==1) P5B,= K>r  
  m_Number.Format("%d picture captured.",nCount); YCStX)r  
 else GPGP teC  
  m_Number.Format("%d pictures captured.",nCount); H-&27?s^  
  UpdateData(FALSE); T<>B5G~%  
} *7Y#G8 s  
"8uNa  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) p*g)-/mA  
{ un!v1g9O  
 if(pMsg -> message == WM_KEYDOWN) 3O4lG e#u  
 { V;RgO}  
  if(pMsg -> wParam == VK_ESCAPE) %U}6(~  
   return TRUE; h*y+qk-!\g  
  if(pMsg -> wParam == VK_RETURN) $Yu'B_E6p  
   return TRUE; glo G_*W  
 } &R.5t/x_  
 return CDialog::PreTranslateMessage(pMsg); ORP<?SG55u  
} G na%|tUz|  
W;R6+@I[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) XNx$^I=  
{ EUI*:JU-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ :+>7m  
  SaveBmp(); '?m2|9~  
  return FALSE; ipMSMk7gx  
} - |DWPU!"  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 5tkKd4VfL  
 CMenu pop; hR0a5   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ud)WH|Z  
 CMenu*pMenu=pop.GetSubMenu(0); \WnTpl>B  
 pMenu->SetDefaultItem(ID_EXITICON); ) YwEl72c  
 CPoint pt; .H M3s  
 GetCursorPos(&pt); E(6P%(yt8  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); *) B \M>  
 if(id==ID_EXITICON) *re?V9  
  DeleteIcon(); NL `  
 else if(id==ID_EXIT) MUZ]*n&0  
  OnCancel(); >Ho=L)u  
 return FALSE; RuVk>(?WK%  
} "8ZV%%elp  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); [~|k;\2 +  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) >oyf i:  
 AddIcon(); iNl<<0a  
 return res; %=2sz>M+  
} 4<}@hk Y  
]smu~t0\  
void CCaptureDlg::AddIcon() ; xw9#.d#D  
{ _~CJitR3  
 NOTIFYICONDATA data; z8S]FpM6  
 data.cbSize=sizeof(NOTIFYICONDATA); /@ g 8MUq7  
 CString tip; eJ<P  
 tip.LoadString(IDS_ICONTIP); 6rmx{Bt  
 data.hIcon=GetIcon(0); z<!A;.iD  
 data.hWnd=GetSafeHwnd(); r6Vw!^]8u8  
 strcpy(data.szTip,tip); ;aD~1;q  
 data.uCallbackMessage=IDM_SHELL; e~)4v  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; D5Sbs(  
 data.uID=98; 60%fva  
 Shell_NotifyIcon(NIM_ADD,&data); i83Jy w,f  
 ShowWindow(SW_HIDE); N lm}'Xt  
 bTray=TRUE; lU=VCuW!  
} [];wP '*  
IMdp"  
void CCaptureDlg::DeleteIcon() _(gkYJ+MK  
{ # SCLU9-  
 NOTIFYICONDATA data; &,PA+#  
 data.cbSize=sizeof(NOTIFYICONDATA); Z>3~n  
 data.hWnd=GetSafeHwnd(); bxxLAWQ(  
 data.uID=98; \6APU7S  
 Shell_NotifyIcon(NIM_DELETE,&data); B[YyA  
 ShowWindow(SW_SHOW); FdnLxw  
 SetForegroundWindow(); [bo"!Qk%  
 ShowWindow(SW_SHOWNORMAL); iKu3'jZ/O  
 bTray=FALSE; tFn[U#'  
} =Oh$pZRymu  
nXfz@q  
void CCaptureDlg::OnChange() O,^s)>c  
{ Yyd}>+|<,  
 RegisterHotkey(); !~F oy F  
} S{2;PaK  
8'3&z-  
BOOL CCaptureDlg::RegisterHotkey() u&o4? ]6  
{ G.XxlI}  
 UpdateData(); a(O@E%|u  
 UCHAR mask=0; <bCB-lG*Kb  
 UCHAR key=0; rDwd!Jet  
 if(m_bControl) [{xY3WS  
  mask|=4; 6.45^'t]  
 if(m_bAlt) <=%[.. (S  
  mask|=2; uw8g%  
 if(m_bShift) pcOi%D,o  
  mask|=1; AriV4 +  
  key=Key_Table[m_Key.GetCurSel()]; Citumc)E  
 if(bRegistered){ $X.F=Kv  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ?XyrG1('  
  bRegistered=FALSE; }lPWA/  
 } #<&@-D8  
 cMask=mask; xZ2 1i QeN  
 cKey=key; $?:IRgAr  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); .@mZG<vg  
 return bRegistered; k)F!gV#  
} twldwuN  
!}U3{L-  
  四、小结 x7l}u`N4  
Dqwd=$2%  
  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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