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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: gu/eC  
  $9y]>R  
  一、实现方法 DHbLS3-  
n #p6i  
  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: TIW6v4  
s.6S :  
#pragma data_seg("shareddata") }[!;c+ke  
HHOOK hHook =NULL; //钩子句柄 6NO=NL  
UINT nHookCount =0; //挂接的程序数目 l'&l!D&   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 L(PJ9wjkD  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 e[i&2mM  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey +LQ2To  
static int KeyCount =0; |^S[Gr w  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 +; C|5y  
#pragma data_seg() 9*[!uu  
!#rZ eDmw  
  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。 ve1jLjsB  
3a:(\:?z  
  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: J6hWcA6 g  
b/"gkFe#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR YM 7P!8Gc  
cKey,UCHAR cMask) K *{C:Y  
{ #Jy+:|jJ  
 BOOL bAdded=FALSE; 5WO!u:!'  
 for(int index=0;index<MAX_KEY;index++){ izY,t!  
  if(hCallWnd[index]==0){ vO]gj/SaT  
   hCallWnd[index]=hWnd; ^M,t`r{  
   HotKey[index]=cKey; ~NpnRIt  
   HotKeyMask[index]=cMask; U> e@m?  
   bAdded=TRUE; V3yO_Iqa  
   KeyCount++; pA4/ '7nCl  
   break; dWR?1sV|e  
  } PaMi5Pq  
 } =WyAOgy}  
 return bAdded; 0w< iz;30  
} ?TMo6SU  
//删除热键 k/H<UW?Z]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Lg9]kpOpa  
{ r;O{et't7y  
 BOOL bRemoved=FALSE; ? @h  
 for(int index=0;index<MAX_KEY;index++){ Y91TF'  
  if(hCallWnd[index]==hWnd){ 36J)O-Ti  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ twf;{lZ(  
    hCallWnd[index]=NULL; 66:|)  
    HotKey[index]=0; ;f?OT7>kN  
    HotKeyMask[index]=0; vIN6W   
    bRemoved=TRUE; hh+GW*'~  
    KeyCount--; ~i))Zc3,g\  
    break; e Yyl=YW  
   } -<ZzYQk^h  
  } xqP0Z) ,Ow  
 } w V;y]'  
 return bRemoved; " 8;D^  
} MMhd-B1O&  
#kLM=a/_NO  
d`({z]W;  
  DLL中的钩子函数如下: xS,):R  
\Q^\z   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) _qE2r^o"B  
{ o S_'@u.5  
 BOOL bProcessed=FALSE; p7.@ez ;  
 if(HC_ACTION==nCode) q69a-5q  
 { OX8jCW  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 rQKBT]?y  
   switch(wParam) i;/qJKr&#  
   {  N#T MU  
    case VK_MENU: cTRCQ+W6:  
     MaskBits&=~ALTBIT; V X211U.Q  
     break; {7(h%]  
    case VK_CONTROL: Plm3vk=  
     MaskBits&=~CTRLBIT; ,wRrx&  
     break; HK2`.'D  
    case VK_SHIFT: 1$".7}M4$  
     MaskBits&=~SHIFTBIT; e m>CSBx  
     break; lFc3 5  
    default: //judge the key and send message :^l*_v{  
     break; Bu 6t3  
   } ?$ YE  
   for(int index=0;index<MAX_KEY;index++){ !Y\hF|[z  
    if(hCallWnd[index]==NULL) ?#FA a,  
     continue; ORfA]I-u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N3x}YHFF  
    { 1$Eiv8xd  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5O*+5n  
     bProcessed=TRUE; @B&hR} 4  
    } K"g[%O<  
   } W@UHqHr:\  
  } 72v 9S T  
  else if((lParam&0xc000ffff)==1){ //有键按下 Q{$2D&  
   switch(wParam) J+.t \R  
   { L` Qiu@  
    case VK_MENU: r@ejU'uz  
     MaskBits|=ALTBIT; ipU"|{NK  
     break; 8|J%IE  
    case VK_CONTROL: x6$P(eN  
     MaskBits|=CTRLBIT; +A:}5{  
     break; ZnmBb_eX  
    case VK_SHIFT: r*tGT_/6  
     MaskBits|=SHIFTBIT; 2t(E+^~  
     break; > }:6m  
    default: //judge the key and send message D ORFK  
     break; .6/[X` *  
   } VF[]E0=u6  
   for(int index=0;index<MAX_KEY;index++){ !PQ@"L)p  
    if(hCallWnd[index]==NULL) nY~CAo/:  
     continue; DtZkrj)D/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) pD &\Z~5T  
    { Ue l*:c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); xNm<` Y?  
     bProcessed=TRUE; +'lfW{E1t  
    } hwC3['  
   } $ Q2|{*  
  } kM9E)uT>(<  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 vWj|[| <rX  
   for(int index=0;index<MAX_KEY;index++){ ?[T&y ,ln  
    if(hCallWnd[index]==NULL) I[F.M}5:z  
     continue; uvm=i .  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) | @mZ]`p  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ap=M$9L'  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 gbSZ- ej  
   } wk-ziw  
  } v,2{Vr  
 } Llg[YBJ7>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /5wvXk|@  
} 7H./o Vl  
hd^?svID  
  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: xkqt(ng(  
*[ A%tj%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [!DLT6Qk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); F%< 0pi  
?(R6}ab>K7  
  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: /Wzic+v<>  
|yqx ]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fx=aT  
{ rZzto;NDS  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ;=_KLG <  
 { ZA:YoiaC#  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 rL_AqSGAK1  
  SaveBmp(); 67J=#%\  
  return FALSE; 2TIZltFS0e  
 } &z,w0FOre  
 …… //其它处理及默认处理 kOkgsQQ  
} o[8Y%3  
H!vvdp?Z  
> Y[{m $-  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 1UmV &  
o&X!75^G>  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 9i9VDk{  
D^f;dT;-  
  二、编程步骤 fxyPh  
lN^L#m*@  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; _-&Au%QNJ`  
RdvJA:;q  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ]Nm_<%lT  
{mI95g&  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; E8)C_[QJ`  
OyTBgS G?a  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; z3>}(+  
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  5、 添加代码,编译运行程序。 scrNnO[3j  
b-~Gt]%>m  
三、程序代码 8$@gAlI^  
x{IOn;>R  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL whRc YnJ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) |\elM[G"g  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ wUl}x)xo  
#if _MSC_VER > 1000 9jJ&QACn  
#pragma once DJ=miJI'  
#endif // _MSC_VER > 1000 HO$s&}t  
#ifndef __AFXWIN_H__ {n |Ra[9_  
#error include 'stdafx.h' before including this file for PCH ^oPf>\),C  
#endif gLu#M:4N  
#include "resource.h" // main symbols g.&&=T  
class CHookApp : public CWinApp |J~;yO SD  
{ jh}[7M  
 public: 8[xb+_  
  CHookApp(); 8m-ryr)  
  // Overrides + PGfQN  
  // ClassWizard generated virtual function overrides lE%0ifu  
  //{{AFX_VIRTUAL(CHookApp) J]Uki*s  
 public: '{Iv?gh"  
  virtual BOOL InitInstance(); g+)T\_#u  
  virtual int ExitInstance(); ud! iy  
  //}}AFX_VIRTUAL y%3Yr?]  
  //{{AFX_MSG(CHookApp) {TlS)i`  
  // NOTE - the ClassWizard will add and remove member functions here. qhiQ!fMQ  
  // DO NOT EDIT what you see in these blocks of generated code ! Gu&zplB  
  //}}AFX_MSG ~Kt.%K5lgt  
  DECLARE_MESSAGE_MAP() \e( h6,@  
}; +&Sf$t 1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); _ @ \  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !^B`7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .4.zy]I  
BOOL InitHotkey(); RqH"+/wR  
BOOL UnInit(); Rs5G5W@"A  
#endif nj #Ab  
-/KVZ  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Fi1gM}>py  
#include "stdafx.h" Nluy]h &  
#include "hook.h" ;M\H#%G.  
#include <windowsx.h> WG(tt.  
#ifdef _DEBUG d;)Im "  
#define new DEBUG_NEW wcB-)Ra  
#undef THIS_FILE ~#@sZ0/<  
static char THIS_FILE[] = __FILE__; [u/g =^+u  
#endif 64`V+Hd  
#define MAX_KEY 100 rzEE |  
#define CTRLBIT 0x04 t$R|lv5<  
#define ALTBIT 0x02 >qCUs3}C{*  
#define SHIFTBIT 0x01 (CO8t~J=  
#pragma data_seg("shareddata") >/}v8 k1v  
HHOOK hHook =NULL; "-(yZigQ  
UINT nHookCount =0; ADlPdkmym  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey n16,u$|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT (g4.bbEm  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey D.U)R7(  
static int KeyCount =0;  +'Tr>2V  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift JdFMSmZ@  
#pragma data_seg() u;;]S!:M  
HINSTANCE hins; lhJT&  
void VerifyWindow(); =Tb~CT=  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ?$ o9/9w  
//{{AFX_MSG_MAP(CHookApp) uiM*!ge  
// NOTE - the ClassWizard will add and remove mapping macros here. rhwY5FD?  
// DO NOT EDIT what you see in these blocks of generated code! d%5QEVV  
//}}AFX_MSG_MAP v lOMB  
END_MESSAGE_MAP() (&+ ~hW5d  
gmy_ZVU'  
CHookApp::CHookApp() IP/ zFbc  
{ )\'U$  
 // TODO: add construction code here, [ gx<7}[  
 // Place all significant initialization in InitInstance >*{\N^:z  
} M|6 W<y  
gx@b|rj;  
CHookApp theApp; Y }Rx`%X  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) q_ ']i6  
{ .6f %"E,  
 BOOL bProcessed=FALSE; :!'aP\uE  
 if(HC_ACTION==nCode) 4LJUO5(y@  
 { |oC&;A  
  if((lParam&0xc0000000)==0xc0000000){// Key up jZ7#xRt5w  
   switch(wParam) :C_\.pA  
   { jQC6N#L  
    case VK_MENU: 4Poi:0oOys  
     MaskBits&=~ALTBIT; _`*x}  
     break; |j<b?  
    case VK_CONTROL: uZ\ >  
     MaskBits&=~CTRLBIT; N>'1<i?  
     break; *ZF7m_8u{  
    case VK_SHIFT: fQ 'P2$  
     MaskBits&=~SHIFTBIT; #V*<G#B  
     break; Quc9lL  
    default: //judge the key and send message ,8cw jS2E  
     break; 9Clddjf?c  
   } j*rra  
   for(int index=0;index<MAX_KEY;index++){ UYD(++  
    if(hCallWnd[index]==NULL) Z?O aY4  
     continue; lm o>z'<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Xc"S"a^\%  
    { TY5<hPU=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2?nK71c"  
     bProcessed=TRUE; U}_l]gNn  
    } +#A >[,U  
   } j'#W)dp(  
  } CKmoC0.  
  else if((lParam&0xc000ffff)==1){ //Key down I[WW1P5  
   switch(wParam) p p9Gzn C  
   { B/c_pRl;  
    case VK_MENU: `GUj.+u  
     MaskBits|=ALTBIT; G@BF<e{  
     break; Fpzps!(;=  
    case VK_CONTROL: "ALR)s,1,  
     MaskBits|=CTRLBIT; :|EM1-lwf  
     break; U[ u9RB  
    case VK_SHIFT: n*{e0,gp`  
     MaskBits|=SHIFTBIT; !!%vs 6  
     break; u B~/W  
    default: //judge the key and send message w%GEOIj}  
     break; .3 m^yo c/  
   } 4%aODr8  
   for(int index=0;index<MAX_KEY;index++) ? D2:'gg  
   { ]SFB_5Gb  
    if(hCallWnd[index]==NULL) 90Jxn'>^  
     continue; `LEk/b1(P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %o.{h  
    { GL(R9Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {~.h;'m  
     bProcessed=TRUE; i$?i1z*c}  
    } XTXRC$B  
   } RYZh"1S;k  
  } pMHY2t  
  if(!bProcessed){ V+W,# 5  
   for(int index=0;index<MAX_KEY;index++){ 66,?f<b  
    if(hCallWnd[index]==NULL) s>9w+|6Ji  
     continue; ]<WKi=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "9Sxj  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *+vS f7  
   } w(]Q `  
  } D"El6<3)h  
 } 5YQ4]/h  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &|LZ%W0Fb  
} cP`o?:  
 U(dT t  
BOOL InitHotkey() aF;Q SI  
{ -^Baxkq(YM  
 if(hHook!=NULL){ \=?f4*4|/  
  nHookCount++; L!|c: 8  
  return TRUE; XwOj`N{!H  
 } o6P)IZ1  
 else ^ D/:[  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); MW &iNioX  
  if(hHook!=NULL) Q4JwX=ZVj  
   nHookCount++; J0~Ha u  
  return (hHook!=NULL); Qb!9QlW  
} C%85Aq*4  
BOOL UnInit() 22a$//}E  
{ O{y2tz3  
 if(nHookCount>1){ ~N&j6wHg#  
  nHookCount--; | y\B*P  
  return TRUE; MS%xOB*6  
 } \(R(S!xr_  
 BOOL unhooked = UnhookWindowsHookEx(hHook); DI'wZySS^  
 if(unhooked==TRUE){ NmthvKhH   
  nHookCount=0; N J9H=  
  hHook=NULL; hub1rY|No  
 } Mf^ ;('~  
 return unhooked; 40<ifz[7  
} /0>Cy\eN0  
MoIVval/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) we9R4 *j  
{ #qi@I;;t  
 BOOL bAdded=FALSE; m2AA:u_*j  
 for(int index=0;index<MAX_KEY;index++){ #G:~6^A  
  if(hCallWnd[index]==0){ 2VyLt=mdh  
   hCallWnd[index]=hWnd; f*04=R?w7>  
   HotKey[index]=cKey; H,9e<x#own  
   HotKeyMask[index]=cMask; ;,}tXz  
   bAdded=TRUE; dW Y0  
   KeyCount++; 7rw}q~CE5  
   break; 7Co }4  
  } { aqce g  
 } ( ?3 )l   
 return bAdded; [~,~ e   
} V7.xKmB  
2u4aCfIx  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *`YR-+0  
{ Y-hGHnh]'  
 BOOL bRemoved=FALSE; '9>z4G*Td  
 for(int index=0;index<MAX_KEY;index++){ xV @X%E  
  if(hCallWnd[index]==hWnd){ {wiw]@c8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !U>711$  
    hCallWnd[index]=NULL; @5K/z<p%  
    HotKey[index]=0; /PN[g~3  
    HotKeyMask[index]=0; UbE*x2N  
    bRemoved=TRUE; <ppM\$  
    KeyCount--; =ltT6of@o  
    break; ]e@'9`G-'  
   } )=V0  
  } %,Xs[[?i  
 } N%'=el4L  
 return bRemoved; *aT3L#0(  
} 'z0@|a  
?u{y[pI6  
void VerifyWindow()  ~,Ck  
{ Ho9 a#9  
 for(int i=0;i<MAX_KEY;i++){ O+A/thI%*S  
  if(hCallWnd!=NULL){ TXD\i Dq  
   if(!IsWindow(hCallWnd)){ V4ml& D  
    hCallWnd=NULL; 6;i]v|M-  
    HotKey=0; 4<CHwIRHY  
    HotKeyMask=0; OV8Y)%t"  
    KeyCount--; q$7WZ+Y\  
   } ^\Gaf5{  
  } 48nZ H=(Eh  
 } ,Ua`BWF  
} l'n"iQ!G  
5rK7nLb  
BOOL CHookApp::InitInstance() 6|+I~zJ88  
{ ;0(|06=  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); *6=2UJcJ  
 hins=AfxGetInstanceHandle(); ,{MA90!  
 InitHotkey(); `O ?61YUQH  
 return CWinApp::InitInstance(); AI}29L3C  
} !%>p;H%0  
PB*m D7"  
int CHookApp::ExitInstance() /co^swz  
{ CKeT%3  
 VerifyWindow(); '+LC.lM  
 UnInit(); tYK 5?d  
 return CWinApp::ExitInstance(); JK34pm[s  
} 7KXc9:p+  
>xb}AY;  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >/k[6r5  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) c,-3+b  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ oMk6ZzZ,>  
#if _MSC_VER > 1000 cL}} ^  
#pragma once $x#0m  
#endif // _MSC_VER > 1000 ZE863M@.  
^=Q/ H  
class CCaptureDlg : public CDialog B%QvFxZz  
{ :^]rjy/|+  
 // Construction 'M+iw:R__  
 public: 2&7:JM~#  
  BOOL bTray; H`|8x4  
  BOOL bRegistered; kBg,U8|S  
  BOOL RegisterHotkey(); pLi_)(#z_  
  UCHAR cKey; #e:cB'f  
  UCHAR cMask; b:VCr^vp  
  void DeleteIcon(); KfD=3h=  
  void AddIcon(); xsn2Qn/P  
  UINT nCount; UPQ?vh2F2  
  void SaveBmp(); wxU@M1w}  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor hF|N81T  
  // Dialog Data l0N~mes  
  //{{AFX_DATA(CCaptureDlg) HE#IJB6BS?  
  enum { IDD = IDD_CAPTURE_DIALOG }; 2 ZW {  
  CComboBox m_Key; NN\>( =  
  BOOL m_bControl; a~jU~('4}w  
  BOOL m_bAlt; tGv5pe*r  
  BOOL m_bShift; Tl>D=Vnhh  
  CString m_Path; 3BHPD;U  
  CString m_Number; 0<Q['l4Ar  
  //}}AFX_DATA }}L :6^  
  // ClassWizard generated virtual function overrides If[4]-dq  
  //{{AFX_VIRTUAL(CCaptureDlg) 8>Az<EF^=#  
 public: (U bz@s^  
  virtual BOOL PreTranslateMessage(MSG* pMsg); M,nX@8 _h  
 protected: X}x"+ #\<@  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ObJgJr  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %<c2jvn+k  
  //}}AFX_VIRTUAL m X2i^.zH  
  // Implementation 6Q\0v  
 protected: _M[@a6?  
  HICON m_hIcon; t&m 8 V$Q  
  // Generated message map functions 3[`/rg,  
  //{{AFX_MSG(CCaptureDlg) Yl}'hRp  
  virtual BOOL OnInitDialog(); mN+ w,  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Uj]Tdg  
  afx_msg void OnPaint(); 5qZebD2a  
  afx_msg HCURSOR OnQueryDragIcon(); zl8O @g  
  virtual void OnCancel(); lsJl+%&8  
  afx_msg void OnAbout(); V?pqKQL0  
  afx_msg void OnBrowse(); YQ/  
  afx_msg void OnChange(); K[{hh;7  
 //}}AFX_MSG dQW=k^X 'U  
 DECLARE_MESSAGE_MAP() C]/]ot0%t  
}; vl1`s ^}R  
#endif #yPQt!  
:De@_m  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ktE~)G  
#include "stdafx.h" %a\!|/;6  
#include "Capture.h" k2]fUP  
#include "CaptureDlg.h" va6e]p*Oy  
#include <windowsx.h> YO&=f d*  
#pragma comment(lib,"hook.lib") i3 ?cL4  
#ifdef _DEBUG n[|*[II  
#define new DEBUG_NEW K,B qVu  
#undef THIS_FILE i{T mn  
static char THIS_FILE[] = __FILE__; 1{%3OG^'  
#endif $wnK"k%G  
#define IDM_SHELL WM_USER+1 L TsX{z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); EL/~c*a/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  C=k]g  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; s0EF{2<F  
class CAboutDlg : public CDialog OGA_3|[S   
{ .AHf]X0  
 public: ')G, +d^  
  CAboutDlg(); =17d7#-  
  // Dialog Data 0<ze'FbV]  
  //{{AFX_DATA(CAboutDlg) 04o>POR  
  enum { IDD = IDD_ABOUTBOX }; K14FY2"  
  //}}AFX_DATA u?Pec:3%  
  // ClassWizard generated virtual function overrides [2~^~K  
  //{{AFX_VIRTUAL(CAboutDlg) d`eX_]Z  
 protected: b({K6#?'[  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,oin<K  
  //}}AFX_VIRTUAL :`jB1rI  
  // Implementation goa@ e  
 protected: w?;j5[j  
  //{{AFX_MSG(CAboutDlg) ]{.iv_I  
  //}}AFX_MSG @la/sd4`  
  DECLARE_MESSAGE_MAP() 8rV"? m`S  
}; zeqwmV=  
v,}Mn7:  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) $%:=;1Jl  
{ \ t=ls  
 //{{AFX_DATA_INIT(CAboutDlg) [ :Upn)9  
 //}}AFX_DATA_INIT 0eMO`8u[A  
} ;*J_V/&?  
VWLqJd>tr1  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 3P, ul*e  
{ K$1(HbL  
 CDialog::DoDataExchange(pDX); Q L 1e  
 //{{AFX_DATA_MAP(CAboutDlg) .5_zh; `  
 //}}AFX_DATA_MAP z*oe ho  
} 6y0CEly>3#  
4LY$;J;2  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ;xXD2{q  
 //{{AFX_MSG_MAP(CAboutDlg) ffH]`N  
 // No message handlers P* Z1Rs_  
 //}}AFX_MSG_MAP JK jVrx> @  
END_MESSAGE_MAP() *#y9P ve  
f*%Y]XL;%  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) TWU[/ >K  
: CDialog(CCaptureDlg::IDD, pParent) r$Tu``z \  
{ qpEK36Js  
 //{{AFX_DATA_INIT(CCaptureDlg) XJSI/jpa@  
  m_bControl = FALSE; &m PR[{  
  m_bAlt = FALSE; H6.  
  m_bShift = FALSE; L\cb Y6b  
  m_Path = _T("c:\\"); !_P-?u  
  m_Number = _T("0 picture captured."); #{8t ?v l  
  nCount=0; +|K/*VVn`  
  bRegistered=FALSE; r9 5hW  
  bTray=FALSE; U,g)N[|  
 //}}AFX_DATA_INIT S%Bm4jY  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .Ce0yAl~  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); a#pM9n~a  
} -J& b~t@  
W Te1E,M  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) lj US-6  
{ )k~{p;Ke  
 CDialog::DoDataExchange(pDX); xoB "hNIX  
 //{{AFX_DATA_MAP(CCaptureDlg) O>c2*9PM  
  DDX_Control(pDX, IDC_KEY, m_Key); SB) Hz8<  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); N5F+h94z]  
  DDX_Check(pDX, IDC_ALT, m_bAlt); A+QOox]<  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ~a ]R7X7  
  DDX_Text(pDX, IDC_PATH, m_Path); D:56>%y@  
  DDX_Text(pDX, IDC_NUMBER, m_Number); qmF+@R&^i  
 //}}AFX_DATA_MAP IxU#x*  
} E%&E<<nhZ  
&0Bs?oq_  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ]vQU(@+I  
//{{AFX_MSG_MAP(CCaptureDlg) ( L 8V)1N  
 ON_WM_SYSCOMMAND() _|C T|q  
 ON_WM_PAINT() '-2|GX_o  
 ON_WM_QUERYDRAGICON() j"4]iI+{"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) hmES@^n!_  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) NGp^/PZX0  
 ON_BN_CLICKED(ID_CHANGE, OnChange) }nt,DG!r  
//}}AFX_MSG_MAP !#TM%w  
END_MESSAGE_MAP() k:0nj!^4w>  
*USzzLq  
BOOL CCaptureDlg::OnInitDialog() XJguw/[wm  
{ m^%Xl@V:c-  
 CDialog::OnInitDialog(); z#Cgd-^7.#  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _h1:{hF  
 ASSERT(IDM_ABOUTBOX < 0xF000); JfVGs;_,  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 0 >:RFCo  
 if (pSysMenu != NULL) JPmZ%]wA  
 { QG]*v=Z  
  CString strAboutMenu; dMDSyd<(  
  strAboutMenu.LoadString(IDS_ABOUTBOX); @sG5Do  
  if (!strAboutMenu.IsEmpty()) }Zp5d7(@w  
  { zz[[9Am!  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9oA-Swc[  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;yDXo\gm  
  } 2O+fjs  
 } Y}hz UKJ  
 SetIcon(m_hIcon, TRUE); // Set big icon hB1Gtc4n  
 SetIcon(m_hIcon, FALSE); // Set small icon FZ@8&T   
 m_Key.SetCurSel(0); G_5E#{u  
 RegisterHotkey(); 1vL$k[^&d  
 CMenu* pMenu=GetSystemMenu(FALSE); G1S:hw%rp  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); )A*Sl2ew  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ?t"bF:!  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); n1@ Or=5  
 return TRUE; // return TRUE unless you set the focus to a control Mw{skK>b  
} -z?O^:e#x  
_/RP3"#  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^SJa/I EZ.  
{ G}0fk]%\:  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) mP+rPDGp  
 { [+ N 5  
  CAboutDlg dlgAbout; O#@KP"8  
  dlgAbout.DoModal(); J%ue{PL7  
 } Ku<_N]9  
 else &k0c|q]  
 { zE_t(B(Q  
  CDialog::OnSysCommand(nID, lParam); gLQbA$gB  
 } P#x]3j]  
} yL%k5cO$N  
d A' h7D  
void CCaptureDlg::OnPaint() L}.V`v{zc  
{ :taRCh5  
 if (IsIconic()) [.*o< KP  
 { P(XNtQ=K  
  CPaintDC dc(this); // device context for painting qkh.? ~  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); !|;w(/  
  // Center icon in client rectangle M$AQZ')9  
  int cxIcon = GetSystemMetrics(SM_CXICON); ko<VB#pOMr  
  int cyIcon = GetSystemMetrics(SM_CYICON); d){Al(/  
  CRect rect; *N?y<U  
  GetClientRect(&rect); ;J40t14u  
  int x = (rect.Width() - cxIcon + 1) / 2; V[BlT|t  
  int y = (rect.Height() - cyIcon + 1) / 2; dD}!E  
  // Draw the icon #zv'N  
  dc.DrawIcon(x, y, m_hIcon); 8- ]7>2?_  
 } (??|\ &DTi  
 else sow/JLlbC  
 { &`A2&mZ  
  CDialog::OnPaint(); Co^a$K  
 } `<kV)d%xEF  
} $[-{Mm  
^_^rI+cTX1  
HCURSOR CCaptureDlg::OnQueryDragIcon() "yV)&4 )  
{ $N`uM  
 return (HCURSOR) m_hIcon; X>6VucH{\  
} 9,;+B8-A  
R@H}n3,  
void CCaptureDlg::OnCancel() BlvNBB1^  
{ .`Ts'0vVy  
 if(bTray) h8uDs|O9n  
  DeleteIcon(); t?j2Rw3f`I  
  CDialog::OnCancel(); -!p -nk@9|  
} r]vD]  
& 5u[q  
void CCaptureDlg::OnAbout() e{x|d?)8  
{ kg_f;uk+  
 CAboutDlg dlg; Y)X58_En  
 dlg.DoModal(); .cX,"2;n  
} y Yvv;E  
mmn1yX:d  
void CCaptureDlg::OnBrowse() ,w/f :-y  
{ 'd@Vusq}2  
 CString str; umWZ]8  
 BROWSEINFO bi; W<uL{k.Kpd  
 char name[MAX_PATH]; ^2PQ75V@.  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); l C|{{?m  
 bi.hwndOwner=GetSafeHwnd(); +/Lf4??JV  
 bi.pszDisplayName=name; .iL_3:6f  
 bi.lpszTitle="Select folder"; K{00 V#  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; /@bLc1"  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~Zd n#z\  
 if(idl==NULL) r,4V SyZF\  
  return; tK|hC[  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); cMEM}Qh T  
 str.ReleaseBuffer(); TIa`cU`  
 m_Path=str; (u >:G6K  
 if(str.GetAt(str.GetLength()-1)!='\\') ].2it{gF?b  
  m_Path+="\\"; = *A_{u;E  
 UpdateData(FALSE); rHtT>UE=  
} "lf_`4  
]41G!'E=  
void CCaptureDlg::SaveBmp() )LYj,do  
{ ab 1\nzpd  
 CDC dc;  N>Pufr  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); \g}FoN&  
 CBitmap bm; g/q$;cB  
 int Width=GetSystemMetrics(SM_CXSCREEN); EN%Xs578  
 int Height=GetSystemMetrics(SM_CYSCREEN); 32IN;X|  
 bm.CreateCompatibleBitmap(&dc,Width,Height); u0J+Nj9  
 CDC tdc; o/fq  
 tdc.CreateCompatibleDC(&dc); *X;g Y  
 CBitmap*pOld=tdc.SelectObject(&bm); m`c(J1Et  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ~QsQ7SAs  
 tdc.SelectObject(pOld); wz!]]EQ!o  
 BITMAP btm; 4[!&L:tR  
 bm.GetBitmap(&btm); ^~5tntb.  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; NoJo-vo*  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); -7" >A~c  
 BITMAPINFOHEADER bih; .6 E7 R  
 bih.biBitCount=btm.bmBitsPixel; AMYoSc  
 bih.biClrImportant=0; A_%}kt (6  
 bih.biClrUsed=0; t@/r1u|iq  
 bih.biCompression=0; 5Wi5`8m  
 bih.biHeight=btm.bmHeight; *0R=(Gy  
 bih.biPlanes=1; g-%uw[pf  
 bih.biSize=sizeof(BITMAPINFOHEADER); ii*Ty!Sa  
 bih.biSizeImage=size; i c]f o  
 bih.biWidth=btm.bmWidth; 5hpb=2  
 bih.biXPelsPerMeter=0;  j>s%q .  
 bih.biYPelsPerMeter=0; Drlt xI)  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); C_#0Y_O  
 static int filecount=0; xL>0&R  
 CString name; =I/J !}.  
 name.Format("pict%04d.bmp",filecount++); ZF;S}1  
 name=m_Path+name; 5Tp n`2F  
 BITMAPFILEHEADER bfh; |U^ ff^]  
 bfh.bfReserved1=bfh.bfReserved2=0; \FTv N  
 bfh.bfType=((WORD)('M'<< 8)|'B'); @ z#k~  
 bfh.bfSize=54+size; EW4XFP4 c  
 bfh.bfOffBits=54; #IBBaxOk  
 CFile bf; ?V[yw=sl04  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ zPV/{)S  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); G-n`X":$DT  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ^B& Z  
  bf.WriteHuge(lpData,size); fD\h5`-  
  bf.Close();  df 1* [  
  nCount++; u(ZS sftat  
 } 1"odkM  
 GlobalFreePtr(lpData); BJj~fNm1Zr  
 if(nCount==1) 3 XfXMVm  
  m_Number.Format("%d picture captured.",nCount); SsznV}{^  
 else mk4%]t"  
  m_Number.Format("%d pictures captured.",nCount); jd2Fh):q  
  UpdateData(FALSE); m2|0<P@k!  
} !gf&l ^)  
'KQu z)-  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) g\(7z P  
{ VY _(0  
 if(pMsg -> message == WM_KEYDOWN) hkU# lt  
 { Ky nZzR  
  if(pMsg -> wParam == VK_ESCAPE) (I[o;0w  
   return TRUE; t41cl  
  if(pMsg -> wParam == VK_RETURN) ?o.G@-  
   return TRUE; =,@SZsM*B  
 } jQ`"Op 3  
 return CDialog::PreTranslateMessage(pMsg); %q*U[vv  
} nLtP^ 1~9H  
cR5<.$aY  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) KH KqE6  
{ >; W)tc,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Y,(eu*Za  
  SaveBmp(); DR0W)K ^  
  return FALSE; <O>Q;}>gfc  
} Zo0&<QWj  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ,XA;S5FE  
 CMenu pop; Ew;<iY[  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )%tf,3  
 CMenu*pMenu=pop.GetSubMenu(0); p[uwG31IL`  
 pMenu->SetDefaultItem(ID_EXITICON); E?XA/z !  
 CPoint pt; >leOyBEAR  
 GetCursorPos(&pt); r>)\"U#  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); >Le mTr  
 if(id==ID_EXITICON) Dea;9O  
  DeleteIcon(); F'#3wCzt  
 else if(id==ID_EXIT) 95!xTf  
  OnCancel(); mtOrb9` m  
 return FALSE; D\`$  
} W;-Qze\D  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); u%h<5WNh<  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _+;x 4K;  
 AddIcon(); z{n=G  
 return res; r\Nn WS J  
} J5o"JRJ"  
So8P 8TCK  
void CCaptureDlg::AddIcon() UJm`GO  
{ sJ?kp^!g  
 NOTIFYICONDATA data; W"Rii]GK"  
 data.cbSize=sizeof(NOTIFYICONDATA); O.$<Bf9  
 CString tip; nu3 A'E`'k  
 tip.LoadString(IDS_ICONTIP); Z?x]HB`r  
 data.hIcon=GetIcon(0); {[9^@k  
 data.hWnd=GetSafeHwnd(); WWO jyj  
 strcpy(data.szTip,tip); +.R-a+y3  
 data.uCallbackMessage=IDM_SHELL; 3Q]MT  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Rp<Xu6r  
 data.uID=98; & aLR'*]6  
 Shell_NotifyIcon(NIM_ADD,&data); v[|iuOU  
 ShowWindow(SW_HIDE); 9]YmP8  
 bTray=TRUE; cQ8:;-M   
} \D[BRE+  
vB Jva8;Q  
void CCaptureDlg::DeleteIcon() 16+@#d%#p  
{ K7l{&2>?  
 NOTIFYICONDATA data; AHA*yC  
 data.cbSize=sizeof(NOTIFYICONDATA); .6"7Xxe]<  
 data.hWnd=GetSafeHwnd(); an7N<-?  
 data.uID=98; f@}(<#  
 Shell_NotifyIcon(NIM_DELETE,&data); o+t?OG/0  
 ShowWindow(SW_SHOW); M)xK+f2_[  
 SetForegroundWindow(); )b7mzDp(  
 ShowWindow(SW_SHOWNORMAL); -(iJ<  
 bTray=FALSE; p>zE/Pw~  
} g<C})84y3  
z]WT>4  
void CCaptureDlg::OnChange() ;PHnv5 x@f  
{ hB.dqv]^  
 RegisterHotkey(); s=nds"J  
} u<8Q[_E&  
?~K2&eo  
BOOL CCaptureDlg::RegisterHotkey() P:=AD W c  
{ fr?eOigbl  
 UpdateData(); 'I~dJEW7  
 UCHAR mask=0; %qQ(@TG  
 UCHAR key=0; 4mAtYm  
 if(m_bControl) %G@aZWk Sa  
  mask|=4; @$*c0 . |z  
 if(m_bAlt) 96.Wfx  
  mask|=2; <#Lw.;(U;k  
 if(m_bShift) 4[ra  
  mask|=1; S'O0'5U@  
  key=Key_Table[m_Key.GetCurSel()]; JU@$(  
 if(bRegistered){ + ND9###  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); .3&m:P8zV  
  bRegistered=FALSE; ;H=6u  
 } 2ya`2 m  
 cMask=mask; *O5+?J Z!  
 cKey=key; OS 6 )`  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); s7e'9Bx  
 return bRegistered; 6)$_2G%Zq  
} <H)@vW]_  
ws=TR  
  四、小结 }B- A*TI<h  
Dpd$&Wr0Y  
  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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