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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: iOU6V  
  ADDSCY=,  
  一、实现方法 ++6`sMJ  
pEBM3r!X  
  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: (tIo:j  
gy#/D& N[  
#pragma data_seg("shareddata") xJ>fm%{5  
HHOOK hHook =NULL; //钩子句柄 OB Otuu.  
UINT nHookCount =0; //挂接的程序数目 p "n$!ilbm  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 9 7GV2]-M  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 =t9\^RIx)?  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 'gC_)rK*  
static int KeyCount =0; /fZe WU0W  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 jcuB  
#pragma data_seg() k5:G-BQ:  
9 Vkb>yFX'  
  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。 Nl^;A> <u  
mZSD(  
  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: _jLL_GD  
o]yl ;I  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR w80oXXs[#  
cKey,UCHAR cMask) ,l !Ta "  
{ `Aw^H!  
 BOOL bAdded=FALSE; . $BUw  
 for(int index=0;index<MAX_KEY;index++){ =Je[c,&j$?  
  if(hCallWnd[index]==0){ tnH2sHby  
   hCallWnd[index]=hWnd; Al}6q{E9+8  
   HotKey[index]=cKey; `UD/}j@  
   HotKeyMask[index]=cMask; /|tJ6T1LrB  
   bAdded=TRUE; }&cu/o4  
   KeyCount++; A#.edVj.g4  
   break; ,K)_OVB  
  } w_.F' E  
 } mq@6Q\Z+  
 return bAdded; ii T"5`KY  
} >/l? g5{  
//删除热键 i,>khc  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hIy~B['  
{ "iy  
 BOOL bRemoved=FALSE; %zG;Q@  
 for(int index=0;index<MAX_KEY;index++){ w65K[l;2  
  if(hCallWnd[index]==hWnd){ 1S{D6#bE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ J]{QB^?  
    hCallWnd[index]=NULL; ]^h]t~  
    HotKey[index]=0;  Uwf +  
    HotKeyMask[index]=0; yv t.  
    bRemoved=TRUE; L 6 c 40  
    KeyCount--; > V-A;S:  
    break; O_ `VV*  
   } } Yb[   
  } ^E;kgED5  
 } pMw*9s X  
 return bRemoved; IwQ"eUnK  
} 4!Fo$9  
NjVYLn<.r  
'@o;-'b  
  DLL中的钩子函数如下: ]<ldWL  
) i;1*jK  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~IYUuWF(  
{ +"rDT1^V  
 BOOL bProcessed=FALSE; zQcL|  (N  
 if(HC_ACTION==nCode) _Gn2o2T  
 { Y~c|hfL  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 )eUh=eW  
   switch(wParam) &XIt5<$~R  
   {  ^uKwB;@  
    case VK_MENU: |Luqoa  
     MaskBits&=~ALTBIT; wxKX{Bs  
     break; ck: T,F{}  
    case VK_CONTROL: MqW7cjg  
     MaskBits&=~CTRLBIT; n6wV.?8  
     break; \y97W&AN  
    case VK_SHIFT: |]jb& M  
     MaskBits&=~SHIFTBIT; Z InpMp  
     break; '~5LY!H(pT  
    default: //judge the key and send message NCiW^#b  
     break; VJeu 8ZJ.  
   } VEWi_;=J1  
   for(int index=0;index<MAX_KEY;index++){ \:b3~%Fz  
    if(hCallWnd[index]==NULL) [4YTDEv%  
     continue; >"^ O"E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Nv#t:J9f  
    { Oxm>c[R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); LhA*F[6$M  
     bProcessed=TRUE; qX/y5F`  
    } v[ . cd*b  
   } MLXNZd   
  } GZEc l'h*  
  else if((lParam&0xc000ffff)==1){ //有键按下 fT;s-v[`k  
   switch(wParam) nEJq_  
   { ,f~J`3(&  
    case VK_MENU: qB5j;@ r  
     MaskBits|=ALTBIT; 1Ir21un  
     break; k Z?=AXu  
    case VK_CONTROL: 6/5YjO|a  
     MaskBits|=CTRLBIT; F0GxH?  
     break; ,c;Kzp>e  
    case VK_SHIFT: H3z: ZTI  
     MaskBits|=SHIFTBIT; aRj9E}  
     break; $Ipg&`S"  
    default: //judge the key and send message Njxv4cc  
     break; Z_$%.  
   } C^O VB-  
   for(int index=0;index<MAX_KEY;index++){ Y1OCLnK~  
    if(hCallWnd[index]==NULL) (7vF/7BZ|_  
     continue; = I:.X ;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [A~y%bI"  
    { i`(XLi}k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); h?AS{`.1  
     bProcessed=TRUE; DVG(V w  
    } {&cJDqz5=  
   } ^NRl//  
  } &q3"g*q  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 FEW14 U'O  
   for(int index=0;index<MAX_KEY;index++){  DGRXd#  
    if(hCallWnd[index]==NULL) N@2dA*T,  
     continue; \z>fb%YW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `nUXDmdwzO  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ),0g~'I~D  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 7r7YNn/?  
   } 'H3^e}   
  } T5R-B=YWu  
 } ;ic3).H  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); v_<rNc,z-s  
} 6^V=?~a&z  
pM+ AjPr  
  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: !<j'Ea  
|nc@"OJ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %>yG+Od5Z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); IshKH -  
' KP@W9j  
  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: n&L+wqJ  
^&B@Uw5{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "7 4-4  
{ dz:E?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) h:W;^\J:-  
 { riUwBiVa?2  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 >W%EmnLK  
  SaveBmp(); p ?*Q- f  
  return FALSE; iIvc43YV%  
 } 4-? C>  
 …… //其它处理及默认处理 zpzK>DH(  
} Cl5uS%g  
<->{  
o15-ZzE-  
  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。 "~#3&3HVS  
DH[p\Wy'  
  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。 mi=Q{>rb  
iNWw;_|1  
  二、编程步骤 :yL] ;J  
ed]=\Key  
  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"; "fQ~uzg="  
Pnk5mK$  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; p2Z?T}fa}&  
"An,Q82oHf  
  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; z#zI1Am(O  
JUsQ,ETn  
  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; >NO[UX%yP  
D|lzGt  
  5、 添加代码,编译运行程序。 spGb!Y`mR  
5 f@)z"j  
三、程序代码 61,;Uc\T  
?274uAO'  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ]jtK I4  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) /1Qr#OJ(]  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ &VhroHO  
#if _MSC_VER > 1000 z#8~iF1  
#pragma once NiNM{[3oS  
#endif // _MSC_VER > 1000 p?{Xu4(  
#ifndef __AFXWIN_H__ .sxcCrQE  
#error include 'stdafx.h' before including this file for PCH O)C\v F#  
#endif zE336  
#include "resource.h" // main symbols N"pc,Q\xU  
class CHookApp : public CWinApp H~oail{EQ  
{ 5/q}`T9i%7  
 public: cCSs  
  CHookApp(); fWCo;4<5?  
  // Overrides x5|I  
  // ClassWizard generated virtual function overrides %G3h?3  
  //{{AFX_VIRTUAL(CHookApp) GX)u|g  
 public: w ~.f  
  virtual BOOL InitInstance(); _A M*@|p,  
  virtual int ExitInstance(); l3KVW5-!gS  
  //}}AFX_VIRTUAL .4_o>D  
  //{{AFX_MSG(CHookApp) }^4Xv^dW>g  
  // NOTE - the ClassWizard will add and remove member functions here. %OtFHhb  
  // DO NOT EDIT what you see in these blocks of generated code ! Bp*K]3_  
  //}}AFX_MSG 6~0$Z-);(  
  DECLARE_MESSAGE_MAP() Z_PNI#h*  
}; bADnW4N`6;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 6h>wt-tRC  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9V'%<pk''(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Eou~P h*t  
BOOL InitHotkey(); ~< P 0]ju  
BOOL UnInit(); a[v0%W ]u  
#endif .0p0_f=  
ZWii)0'PV  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. t#yk ->,  
#include "stdafx.h" G !<Z.]  
#include "hook.h" ~Xw"}S5  
#include <windowsx.h> !ds"9w  
#ifdef _DEBUG 5(Cl1Yse=r  
#define new DEBUG_NEW JHW "-b  
#undef THIS_FILE Zvhsyz|  
static char THIS_FILE[] = __FILE__; JBD7h5|Lc  
#endif UN7EF/!Zz  
#define MAX_KEY 100 zUDg&-J3  
#define CTRLBIT 0x04 !*/*8re  
#define ALTBIT 0x02 Nw:GCf-L  
#define SHIFTBIT 0x01 \Lq h j  
#pragma data_seg("shareddata") R7]l{2V#^  
HHOOK hHook =NULL; TSA,WP\  
UINT nHookCount =0; KMt`XaC9e  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey B6=ebM`q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ,c$,!.r  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey rjl`&POqc  
static int KeyCount =0; i}b${n o  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift r~[Ia!U?  
#pragma data_seg() m9)p-1y@5  
HINSTANCE hins; 6f;fx}y  
void VerifyWindow(); 3yANv?$a  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) iz5CAxm  
//{{AFX_MSG_MAP(CHookApp) '#! gh?  
// NOTE - the ClassWizard will add and remove mapping macros here. vrl;"Fm+  
// DO NOT EDIT what you see in these blocks of generated code! d[[]P X  
//}}AFX_MSG_MAP cD@(/$wt  
END_MESSAGE_MAP() )W|w C#  
-T!f,g3vW  
CHookApp::CHookApp() ~"dA~[r L  
{ ::o lN  
 // TODO: add construction code here, _t:$XJ`bTk  
 // Place all significant initialization in InitInstance 6L:x^bM  
} r)qnl9?;`]  
"vA}FV%tRq  
CHookApp theApp; agkA}O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5NBV[EP  
{ U6=..K!q  
 BOOL bProcessed=FALSE; \%u3  
 if(HC_ACTION==nCode) ]5BX :%  
 { sPd Gw~{  
  if((lParam&0xc0000000)==0xc0000000){// Key up ,"2s`YC  
   switch(wParam) R[Ll59-  
   { :#2Bw]z&z  
    case VK_MENU: eeIhed9  
     MaskBits&=~ALTBIT; "BD~xP(  
     break; %mL-$*  
    case VK_CONTROL: YTAmgkF\4  
     MaskBits&=~CTRLBIT; R5"K]~  
     break; |b[+I?X  
    case VK_SHIFT: ADZ};:]  
     MaskBits&=~SHIFTBIT; ~a%Z;Aj  
     break; ~7Y+2FZ  
    default: //judge the key and send message V=)_yIS  
     break; Gb"r|(!  
   } l|xZk4@_uE  
   for(int index=0;index<MAX_KEY;index++){ /`9sPR6e  
    if(hCallWnd[index]==NULL) z+ s6)Ad  
     continue; 0WT{,/>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hhb?6]Z/  
    { #btLa\HJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); UYFwS/ RW}  
     bProcessed=TRUE; [N1hWcfvd  
    } hp8%.V$f  
   } f6|KN+.  
  } Vw[6t>`  
  else if((lParam&0xc000ffff)==1){ //Key down l;af~ef)'  
   switch(wParam) Ok>gh2e[c  
   { -g)9R%>-  
    case VK_MENU: UU'|Xz9~  
     MaskBits|=ALTBIT; r`%+M7  
     break; `J]fcE%T0R  
    case VK_CONTROL: ttXXy3G#  
     MaskBits|=CTRLBIT; syk!7zfK  
     break; nv)2!mAh\  
    case VK_SHIFT: )X04K~6lY  
     MaskBits|=SHIFTBIT; :z}MIuf  
     break; El<]b7  
    default: //judge the key and send message .b\$MZ"(  
     break; 0MV>"aV  
   } #G|qD  
   for(int index=0;index<MAX_KEY;index++) 6cpw~  
   { ^?$WVB  
    if(hCallWnd[index]==NULL) KiRUvWqa  
     continue; ]'5;|xc9$/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _C.BFE _p  
    { ^Y<|F!0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); qe#P?[  
     bProcessed=TRUE; u7bLZU 0  
    } !)  S ?m  
   } ~n[d4qV&  
  } x2@U.r"zo  
  if(!bProcessed){ 0_k '.5l%  
   for(int index=0;index<MAX_KEY;index++){ &GNxo$CG  
    if(hCallWnd[index]==NULL) "dsU>3u  
     continue; } $uxJB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ZPc@Zr`z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Wf>zDW^"R  
   } : k7uGD  
  } x8!ol2\`<  
 } ^BUYjq%(`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Av?2<  
} \2nUa ;  
: m)   
BOOL InitHotkey() Ib|Rf;J~-  
{ CL)lq)1(  
 if(hHook!=NULL){ "+\lws  
  nHookCount++; h tx;8:  
  return TRUE; f} Np/  
 } vgD {qg@  
 else ,REJt  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); V<D.sd<  
  if(hHook!=NULL) / y A7%2  
   nHookCount++; !E,A7s  
  return (hHook!=NULL); KQ `qpX^d  
} _8Z_`@0  
BOOL UnInit() j>]nK~[ka  
{ kgy:Q'  
 if(nHookCount>1){ 4VHqBQ4  
  nHookCount--; ;^ La"m  
  return TRUE; xBUya4w  
 } HODz*pI  
 BOOL unhooked = UnhookWindowsHookEx(hHook); /R~1Zj2&  
 if(unhooked==TRUE){ *4U^0e  
  nHookCount=0; Jo$G,Q  
  hHook=NULL; IGS1|  
 } rm4.aO~-F  
 return unhooked; vy_D>tp  
} '7D,m H  
4%2~Wi8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !l|5z G  
{ cZH-"  
 BOOL bAdded=FALSE; W3Dc r@Dy  
 for(int index=0;index<MAX_KEY;index++){ v$(lZa1  
  if(hCallWnd[index]==0){ 61/.K_%I.  
   hCallWnd[index]=hWnd; MS>t_C(  
   HotKey[index]=cKey; rSxxH]-  
   HotKeyMask[index]=cMask; {g2@6ct  
   bAdded=TRUE; #?*WPq  
   KeyCount++; pAb.c  
   break; NM]s8cK_  
  } _$wmI/_J M  
 } *?y+e  
 return bAdded; /EibEd\  
} smdZxFl  
NB\{'  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !:|TdYrmj  
{ h@:TpE+N  
 BOOL bRemoved=FALSE; &LF` W  
 for(int index=0;index<MAX_KEY;index++){ #O$  
  if(hCallWnd[index]==hWnd){ AX?fuDLs  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ I8+~ &V}  
    hCallWnd[index]=NULL; [cTe54n  
    HotKey[index]=0; %STliJ  
    HotKeyMask[index]=0; %|^OOU}  
    bRemoved=TRUE; )x}l3\s  
    KeyCount--; %{(x3\ *&  
    break; hX`hs- *qM  
   } o;W`4S^  
  } $e\h}A6  
 } 'eo KZX+  
 return bRemoved; i<H wTmm$  
} B=>RH!&  
Q:|l`*.R  
void VerifyWindow() Z|_K6v/c  
{ GwG4LIp  
 for(int i=0;i<MAX_KEY;i++){ '"?C4mbSl  
  if(hCallWnd!=NULL){ '"<6.,Ae  
   if(!IsWindow(hCallWnd)){ =Zu^80/  
    hCallWnd=NULL; V[}4L| ad  
    HotKey=0; >N;F8v  
    HotKeyMask=0; Ypeiy `.  
    KeyCount--; U~} U\_  
   } nSF``pp+  
  } uch>AuF:  
 } p8kr/uMP ;  
} UA4J>1 i  
B3H|+  
BOOL CHookApp::InitInstance() /;7y{(o  
{ ;<$H)`*  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); !/^-;o7  
 hins=AfxGetInstanceHandle(); Sr&515  
 InitHotkey(); -6tgsfEr  
 return CWinApp::InitInstance(); 4Ue_Y 'LmM  
} "V>R9dO{"!  
Cw~RJ^a_  
int CHookApp::ExitInstance() cTXri8K_  
{ `((Yc]:7  
 VerifyWindow(); H;U)b{  
 UnInit(); Mn$]I) $  
 return CWinApp::ExitInstance(); 3m>+-})d  
} f'<Q.Vh<  
Mmo6MZ^  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file JOb*-q|y  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) pG34Qw  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ V7Z4T6j4  
#if _MSC_VER > 1000 o]ag"Q  
#pragma once t~e<z81p  
#endif // _MSC_VER > 1000 ~_9n.C  
b{d4xU8'  
class CCaptureDlg : public CDialog n:0}utU4  
{ bn(`O1r[(  
 // Construction JXixYwm  
 public: ~`GhS<D  
  BOOL bTray; kdxz!  
  BOOL bRegistered; l" q1?kaVg  
  BOOL RegisterHotkey(); /erN;Oo%<  
  UCHAR cKey; Dy]I8_  
  UCHAR cMask; >6~k9>nDb<  
  void DeleteIcon(); RrhT'':[  
  void AddIcon(); 4\pWB90V  
  UINT nCount; j ,)P9V  
  void SaveBmp(); DbZ0e5  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7R3fqU.Rq  
  // Dialog Data PN$X N<  
  //{{AFX_DATA(CCaptureDlg) 'qArf   
  enum { IDD = IDD_CAPTURE_DIALOG }; =\,uy8HX  
  CComboBox m_Key; zP:cE  
  BOOL m_bControl; FYb34LY  
  BOOL m_bAlt; C@Nv;;AlU  
  BOOL m_bShift; +&X%<S W  
  CString m_Path; -w;(cE  
  CString m_Number; v}sY|p"  
  //}}AFX_DATA  Og2vGzD  
  // ClassWizard generated virtual function overrides !Oj)B1gc6&  
  //{{AFX_VIRTUAL(CCaptureDlg) K. %U  
 public: '`|A I:L  
  virtual BOOL PreTranslateMessage(MSG* pMsg); /w8"=6Vv~  
 protected: fQ'.8'>T  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0l=+$& D  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); )-Ej5'iHr  
  //}}AFX_VIRTUAL ?!=iu!J  
  // Implementation }C  /]  
 protected: :^'O}2NP  
  HICON m_hIcon; 4g}FB+[u  
  // Generated message map functions ZkP {[^6d\  
  //{{AFX_MSG(CCaptureDlg) >#}2J[2HQ  
  virtual BOOL OnInitDialog(); dl5=q\1=  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ygS L  
  afx_msg void OnPaint(); M wab!Ya  
  afx_msg HCURSOR OnQueryDragIcon(); (f_g7B2&y  
  virtual void OnCancel(); PSRzrv$l  
  afx_msg void OnAbout(); !ph" mf$-  
  afx_msg void OnBrowse(); li] 6Pj,  
  afx_msg void OnChange(); =39 ?:VoD  
 //}}AFX_MSG EQIUSh)M  
 DECLARE_MESSAGE_MAP() j'HkBW:L  
}; 2$ !D* <  
#endif wNNB;n` l  
2b=)6H1  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file wQ+dJ3b$  
#include "stdafx.h" U{~SXk'2+  
#include "Capture.h" /ahNnCtu?1  
#include "CaptureDlg.h" Z~6[ Z  
#include <windowsx.h> G\/"}B:(  
#pragma comment(lib,"hook.lib") mmEp'E  
#ifdef _DEBUG Q}*y$se!  
#define new DEBUG_NEW ]DvO:tM  
#undef THIS_FILE ?-OPX_i_  
static char THIS_FILE[] = __FILE__; =s}Xy_+:  
#endif joa5|t!D9  
#define IDM_SHELL WM_USER+1 QM5 .f+/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 85|fyX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); V8-h%|$p3W  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Te{ *6-gO3  
class CAboutDlg : public CDialog BHj\G7,S  
{ B|%tE{F  
 public: 02JoA+  
  CAboutDlg(); DjCx~@  
  // Dialog Data .mL#6P!d3^  
  //{{AFX_DATA(CAboutDlg) U@Tj B  
  enum { IDD = IDD_ABOUTBOX }; I\Glc=T*  
  //}}AFX_DATA ?0<w  
  // ClassWizard generated virtual function overrides 8BXqZVm.  
  //{{AFX_VIRTUAL(CAboutDlg) Y-~~,Yl~  
 protected: G{x[uE2X&f  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [9mL $;M W  
  //}}AFX_VIRTUAL ;`v% sx#  
  // Implementation }:z5t,u6  
 protected: h:/1X' 3d  
  //{{AFX_MSG(CAboutDlg) cPn+<M#  
  //}}AFX_MSG ,>LRa  
  DECLARE_MESSAGE_MAP() 7m9 " 8   
}; )F pJ 1  
68R1AqU_  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ~V)?>)T  
{ ~S; Z\  
 //{{AFX_DATA_INIT(CAboutDlg) % *z-PT22  
 //}}AFX_DATA_INIT 9l+{OA  
} 8cm@a*2%  
jU=<r  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) WxGSv#u  
{ *s)}Bj  
 CDialog::DoDataExchange(pDX); Eff\Aq{  
 //{{AFX_DATA_MAP(CAboutDlg) F6S~$<  
 //}}AFX_DATA_MAP ad n|N  
} nhdTTap&9  
fP%Fyg^k  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7;LO2<|1  
 //{{AFX_MSG_MAP(CAboutDlg) h<p3'  
 // No message handlers v })Q  
 //}}AFX_MSG_MAP |G=[5e^s[  
END_MESSAGE_MAP() GlR~%q-jiQ  
rUwE?Ekn/  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ivrXwZ7jT  
: CDialog(CCaptureDlg::IDD, pParent) %*)2s,8  
{ W"hcaa,&  
 //{{AFX_DATA_INIT(CCaptureDlg) ?\H.S9CZ^  
  m_bControl = FALSE; (:\LWJX0=  
  m_bAlt = FALSE; G+"8l!dC?  
  m_bShift = FALSE; (U87}}/l  
  m_Path = _T("c:\\"); ;RN8\re  
  m_Number = _T("0 picture captured."); q42FP q  
  nCount=0; ua 8m;>R  
  bRegistered=FALSE; FUeq \Wuo  
  bTray=FALSE; *+lsZ8'^C  
 //}}AFX_DATA_INIT gs`^~iD]m  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &1)xoZ'\  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); @?&Wm3x9  
} O|v (5 8A  
J\W-dI  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) CJNG) p  
{ P#G.lft"O  
 CDialog::DoDataExchange(pDX); #Ws 53mT  
 //{{AFX_DATA_MAP(CCaptureDlg) 6E9N(kFYs  
  DDX_Control(pDX, IDC_KEY, m_Key); ,EhVSrh)_4  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); X<MpN5%|Wo  
  DDX_Check(pDX, IDC_ALT, m_bAlt); (;6s)z  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ,9ml>ji`=  
  DDX_Text(pDX, IDC_PATH, m_Path); sms1%%~  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 8?jxDW a  
 //}}AFX_DATA_MAP oL *n>dH  
} a0d ,  
17py ).\  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) x3p9GAd#  
//{{AFX_MSG_MAP(CCaptureDlg) ER|!KtCSM  
 ON_WM_SYSCOMMAND() aqQ o,5U>  
 ON_WM_PAINT() ZTf_#eS$  
 ON_WM_QUERYDRAGICON() 'M%5v'$y  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) dl[ob,aCK  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) boQ)fV"  
 ON_BN_CLICKED(ID_CHANGE, OnChange) (Nz]h:}r  
//}}AFX_MSG_MAP R "E<8w  
END_MESSAGE_MAP() sQk|I x  
yMIT(  
BOOL CCaptureDlg::OnInitDialog() P"4Mm, C  
{ ~8Sqa%F>  
 CDialog::OnInitDialog(); k@q Wig  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); hhq$g{+[  
 ASSERT(IDM_ABOUTBOX < 0xF000); nN{dORJlx  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 1 Nk1MGV  
 if (pSysMenu != NULL) bf98B4<  
 { aR(E7mXQ  
  CString strAboutMenu; &d 3HB=x  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &|z544  
  if (!strAboutMenu.IsEmpty()) ag]*DsBt  
  { \8_V(lU   
   pSysMenu->AppendMenu(MF_SEPARATOR); &,uC9$  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); J'7 y   
  } +>E5X4JC  
 } q0|Z oP  
 SetIcon(m_hIcon, TRUE); // Set big icon z<QIuq  
 SetIcon(m_hIcon, FALSE); // Set small icon :c;_a-69  
 m_Key.SetCurSel(0); a"qR J-@  
 RegisterHotkey(); /Nqrvy=  
 CMenu* pMenu=GetSystemMenu(FALSE); OLFt;h  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); lS{4dvr?w  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); lV7IHX1P  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4 ?2g&B\  
 return TRUE; // return TRUE unless you set the focus to a control n2 na9dX)w  
} wG:$6  
5`UJouHi  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;qVG \wQq  
{ T5{T[YdX<  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) >40 GP#Vz  
 { Gmgeve  
  CAboutDlg dlgAbout; a#R %8)  
  dlgAbout.DoModal(); )_pt*xo  
 } x(yX0 ,P/7  
 else B? TpBd  
 { G"fdu(.@  
  CDialog::OnSysCommand(nID, lParam); W8uVd zQ   
 } %QE5<2k  
} 8 DL hk  
4^MSX+zt  
void CCaptureDlg::OnPaint() ^^Bm$9  
{ Uf[T_  
 if (IsIconic()) F(G<* lA  
 { ;x RjQR  
  CPaintDC dc(this); // device context for painting Z]e4pR6!  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~GYpa t  
  // Center icon in client rectangle G* Ib^;$u  
  int cxIcon = GetSystemMetrics(SM_CXICON); |)';CBb  
  int cyIcon = GetSystemMetrics(SM_CYICON); 4d6% t2  
  CRect rect; ;:^ Lv  
  GetClientRect(&rect); 1bDJ}M~]z  
  int x = (rect.Width() - cxIcon + 1) / 2; wV %8v\  
  int y = (rect.Height() - cyIcon + 1) / 2; V4oak!}?  
  // Draw the icon d.b?! kn  
  dc.DrawIcon(x, y, m_hIcon); 6o9sR)c ?  
 } XL?A w  
 else oEPNN'~3  
 { G/%Ubi6%  
  CDialog::OnPaint(); B^Bbso'{1  
 } I-,Xwj-  
} ?V6 %>RU  
[M<{P5q  
HCURSOR CCaptureDlg::OnQueryDragIcon() (-#rFO5~l  
{ dd19z%  
 return (HCURSOR) m_hIcon; Cl-S=q@>V  
} tbRE/L<  
v?%0~!  
void CCaptureDlg::OnCancel() Flne=ij6g  
{ uJm#{[  
 if(bTray) &:C{/QnA  
  DeleteIcon(); 3P3:F2S R  
  CDialog::OnCancel(); `L+ ~&M  
} y 2cL2c$BT  
u& AQl.u  
void CCaptureDlg::OnAbout() `J]<_0kX}%  
{  Q;Q  
 CAboutDlg dlg; /H.(d 4C  
 dlg.DoModal(); nxf {PbHk  
} D@}St:m}  
PGMv(}%;  
void CCaptureDlg::OnBrowse() % Mw'e/?  
{ T&mbXMN  
 CString str; e%'z=%(  
 BROWSEINFO bi; vx PDC~3;  
 char name[MAX_PATH]; #?A]v>I;C  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); CF,8f$:2  
 bi.hwndOwner=GetSafeHwnd(); /bu'6/!`  
 bi.pszDisplayName=name; KuU3DTS85Z  
 bi.lpszTitle="Select folder"; zL6 \p)y  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; nq),VPJi  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); pqkcf \  
 if(idl==NULL) - a   
  return; CL EpB2_  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); )#)nBM2\  
 str.ReleaseBuffer(); J.*[gt%O|  
 m_Path=str; mQmBf|Rl  
 if(str.GetAt(str.GetLength()-1)!='\\')  W{L  
  m_Path+="\\"; ;`;G/1]#9  
 UpdateData(FALSE); Z={D0`  
} HDa~7wE  
l@~1CMyN  
void CCaptureDlg::SaveBmp() r94j+$7  
{ Y1m}@k,+M  
 CDC dc; >a?OXqYP  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); D$Kz9GVZq  
 CBitmap bm; r.Y*{!t  
 int Width=GetSystemMetrics(SM_CXSCREEN); T$#FAEz  
 int Height=GetSystemMetrics(SM_CYSCREEN); =I+l=;05Rd  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Bm65 W  
 CDC tdc; `WraOsoY  
 tdc.CreateCompatibleDC(&dc); >cBGw'S  
 CBitmap*pOld=tdc.SelectObject(&bm); cZCGnzy  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); )[e%wPu4e  
 tdc.SelectObject(pOld); J(3gT }z-  
 BITMAP btm; 3D]2$a_d  
 bm.GetBitmap(&btm); Mp]yKl  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 4jDs0Hn"  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); uWJ#+XK.  
 BITMAPINFOHEADER bih; N8Rm})  
 bih.biBitCount=btm.bmBitsPixel; L*kh?PS;  
 bih.biClrImportant=0; 1}i&HIr!b  
 bih.biClrUsed=0; Usa{J:  
 bih.biCompression=0; =)mXCA^  
 bih.biHeight=btm.bmHeight; # Nu%]  
 bih.biPlanes=1; :;" aUHU'  
 bih.biSize=sizeof(BITMAPINFOHEADER); Ib_n'$5#z  
 bih.biSizeImage=size;  #a|6Q 8  
 bih.biWidth=btm.bmWidth; ~E^yM=:h  
 bih.biXPelsPerMeter=0; ckH$E%j   
 bih.biYPelsPerMeter=0; KK&<Vw|O\  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ))%@@l[  
 static int filecount=0; *#9VC)Q  
 CString name; |@T5$Xg]5  
 name.Format("pict%04d.bmp",filecount++); ]+^;vc 1r  
 name=m_Path+name; s_S<gR  
 BITMAPFILEHEADER bfh; NqQM! B]  
 bfh.bfReserved1=bfh.bfReserved2=0; ^8o_Iz)r,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 2N8rM}?90  
 bfh.bfSize=54+size; g:G%Ei~sF  
 bfh.bfOffBits=54; &4w\6IR  
 CFile bf; V6DBKq  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ XgwMppacw  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 6Tm Rc  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); \;3B?8wbIl  
  bf.WriteHuge(lpData,size);  ;'2`M  
  bf.Close(); 2eZk3_w  
  nCount++; PfwI@%2  
 } $V`KrA~]  
 GlobalFreePtr(lpData); W+F<P@[u<$  
 if(nCount==1) m &0(%  
  m_Number.Format("%d picture captured.",nCount); 0U>t>&,"  
 else *` @XKK  
  m_Number.Format("%d pictures captured.",nCount); %a)0?U  
  UpdateData(FALSE); aTL8l.c2  
} b0~H>cnA  
Gvt;Q,hH  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) y(aAp.S>  
{ PV,kYM6  
 if(pMsg -> message == WM_KEYDOWN) y V 9]_k  
 { Z@>=&  
  if(pMsg -> wParam == VK_ESCAPE) Rye ~w6  
   return TRUE; O<eWq]  
  if(pMsg -> wParam == VK_RETURN) ~$?y1Yv  
   return TRUE; =!pu+&I 9  
 } /pAm8vK   
 return CDialog::PreTranslateMessage(pMsg); J1gEjd   
} %2rHvF=  
=sUl`L+w,L  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /ZIJ<#o[  
{ Q`@$j,v  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ H|rX$P  
  SaveBmp();  uu WY4j6  
  return FALSE;  K$37}S5  
} o+"0.B  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ t?du+:  
 CMenu pop; S|RpA'n  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); A4 A6F<  
 CMenu*pMenu=pop.GetSubMenu(0); ] dm1Qm  
 pMenu->SetDefaultItem(ID_EXITICON); EMVoTW)z  
 CPoint pt; W|r+J8  
 GetCursorPos(&pt); ^LEmi1L  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); P/C+L[X=  
 if(id==ID_EXITICON) Z uFV tW@  
  DeleteIcon(); g "K#&  
 else if(id==ID_EXIT) #Vn>ue+?  
  OnCancel(); K c2OLz#  
 return FALSE; $ +GFOO  
} @^y?Bh9jQ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); }ZM*[j  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) EL 8N[]RF  
 AddIcon(); [G'!`^V,  
 return res; [0tf Y0  
} m>*A0&??[  
E.H,1 {  
void CCaptureDlg::AddIcon() .@8m\  
{ {LB }v;?l  
 NOTIFYICONDATA data; 9J2q`/6~e  
 data.cbSize=sizeof(NOTIFYICONDATA); ;mo\ yW1  
 CString tip; Wd^F%)(  
 tip.LoadString(IDS_ICONTIP); Bah.\ZsYQP  
 data.hIcon=GetIcon(0);  ^ :  
 data.hWnd=GetSafeHwnd(); R[>;_}5">  
 strcpy(data.szTip,tip); @sg T[P*ut  
 data.uCallbackMessage=IDM_SHELL; #2lvfR|  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; fbzKO^Ub  
 data.uID=98; C+L_61  
 Shell_NotifyIcon(NIM_ADD,&data); }Pm(oR'KTJ  
 ShowWindow(SW_HIDE); $_URXI  
 bTray=TRUE; :9!0 Rm  
} 9pl_V WrQ  
4I:JaRT d  
void CCaptureDlg::DeleteIcon() U Qi^udGFD  
{ t6h`WAZV  
 NOTIFYICONDATA data; %!HnGwv-  
 data.cbSize=sizeof(NOTIFYICONDATA); QNa}M{5>h  
 data.hWnd=GetSafeHwnd(); IioE<wS)  
 data.uID=98; |W~V@n8"6  
 Shell_NotifyIcon(NIM_DELETE,&data); QGbD=c7  
 ShowWindow(SW_SHOW); {xBjEhQm  
 SetForegroundWindow();  Z$#ZYD  
 ShowWindow(SW_SHOWNORMAL); g+KzlS[6  
 bTray=FALSE; U$/Hp#~X  
} +2au ;^N  
Hh/ -^G  
void CCaptureDlg::OnChange() YPff)0Nh  
{ C tC`:!Q  
 RegisterHotkey(); ?`l=!>C4s  
} 4MtqQq4%  
c~L6fvS  
BOOL CCaptureDlg::RegisterHotkey() )QSt7g|OF  
{ 1{Alj27  
 UpdateData(); 4_m /_Z0x  
 UCHAR mask=0; ]|$$:e^U9  
 UCHAR key=0; \_I)loPc8  
 if(m_bControl) vN%j-'D\A4  
  mask|=4; 'j"N2NJ  
 if(m_bAlt) P8,{k  
  mask|=2; 6JFDRsX>)?  
 if(m_bShift) N>}K+M>  
  mask|=1; {OhkuON  
  key=Key_Table[m_Key.GetCurSel()]; H-cBXp5z  
 if(bRegistered){ R !%m5Q?5  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ?k:])^G5  
  bRegistered=FALSE; &zh+:TRm  
 } M9 2~iM  
 cMask=mask; J! 6z  
 cKey=key; |b-Zy~6  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ad$Qs3)6o  
 return bRegistered; P15 *VPy  
} %oCjZ"ke  
J_wz'eIb0  
  四、小结 oCdOC5  
+&N&D"9A  
  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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