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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: <FT7QO$I  
  .t8)`MU6.  
  一、实现方法 yaUtDC.|  
\v2!5z8|  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: sZ `Tv[  
AxEyXT(h5  
#pragma data_seg("shareddata") &G {GLP?H  
HHOOK hHook =NULL; //钩子句柄 &o:5lxR{  
UINT nHookCount =0; //挂接的程序数目 [M|^e;tWK  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 6h:QSVfx  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 n Bu!2c  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ?@64gdlwq  
static int KeyCount =0; =2R4Z8G  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ":]X r!e  
#pragma data_seg() g3^s_*A  
8g#$Y2P  
  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。 LmrdVSs_  
.;? Bni  
  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: {U5sRM|I  
pBsb>wvej  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR dY1t3@E  
cKey,UCHAR cMask) :qzg?\(  
{ VPMu)1={:p  
 BOOL bAdded=FALSE; &[E\2 E  
 for(int index=0;index<MAX_KEY;index++){ u64#,mC[*  
  if(hCallWnd[index]==0){ bC{4a_B  
   hCallWnd[index]=hWnd; WtM%(8Y[]  
   HotKey[index]=cKey; -cgO]q+Oq  
   HotKeyMask[index]=cMask; h<.5:a  
   bAdded=TRUE; (J:+'u  
   KeyCount++; ]!hjKu"  
   break; ]S2rqKB  
  } )2f#@0SVL  
 } SB62(#YR  
 return bAdded; _"8n&=+  
} 'E| %l!xO  
//删除热键 E|O&bUMh  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) At7!Pas#@g  
{ omG2p  
 BOOL bRemoved=FALSE; &Vlno*  
 for(int index=0;index<MAX_KEY;index++){ eg[EFI.h  
  if(hCallWnd[index]==hWnd){ (:o F\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >AJ/!{jD*  
    hCallWnd[index]=NULL; N?\X 2J1  
    HotKey[index]=0; (Y1*Bs[l  
    HotKeyMask[index]=0; <A3%1 82  
    bRemoved=TRUE; ni;_Un~  
    KeyCount--; K~(RV4oF8B  
    break; DUOoTl p  
   } g)hEzL0k  
  } v\x l?F  
 } $>rt0LOF  
 return bRemoved; mGT('iTM4  
} U:7h>Z0W  
Ah &D5,3  
)E^4\3 ^:  
  DLL中的钩子函数如下: c*_I1}l  
_-Aw`<_*-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -)?~5Z   
{ u9>.x zYG  
 BOOL bProcessed=FALSE; 5Lt&P 5BY  
 if(HC_ACTION==nCode) 9r7QE&.  
 { D|Z,eench  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 vdNh25a<h  
   switch(wParam) @-;-DB]j  
   {  Xig+[2zS  
    case VK_MENU: 7BF't!-2F  
     MaskBits&=~ALTBIT; ^$_a_ft#  
     break; 5in6Y5ckj  
    case VK_CONTROL: wLU w'Ai  
     MaskBits&=~CTRLBIT; ^<<( }3  
     break; 5gV8=Ml"V  
    case VK_SHIFT: ag?@5q3J}  
     MaskBits&=~SHIFTBIT; 5\f*xY  
     break; qB7.LR*'  
    default: //judge the key and send message DSy,#yA  
     break; qEf )TW(  
   } PF!Q2t5c3  
   for(int index=0;index<MAX_KEY;index++){ f b_tda",}  
    if(hCallWnd[index]==NULL) s iv KXd  
     continue; .$4DK*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5<a)SP 0  
    { J C1T033 r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); o&?Tz*"l  
     bProcessed=TRUE; d+ih]?  
    } !?ayZ5G([  
   } #joU}Rj|  
  } ,US~p_M!  
  else if((lParam&0xc000ffff)==1){ //有键按下 "~7| !9<  
   switch(wParam) *=S\jek  
   { 4^alAq^  
    case VK_MENU: K~@-*8%  
     MaskBits|=ALTBIT; X&M4 c5Li  
     break; J*,Ed51&7  
    case VK_CONTROL: c1CP1 2  
     MaskBits|=CTRLBIT; j>?H^fB  
     break; _QBd3B %  
    case VK_SHIFT: 8+ B.x  
     MaskBits|=SHIFTBIT; ss,t[`AV{  
     break; w_,.  
    default: //judge the key and send message uiE9#G  
     break; #JO#PV%  
   } cPI #XPM=  
   for(int index=0;index<MAX_KEY;index++){ }.2pR*W  
    if(hCallWnd[index]==NULL) b3EW"^Ar  
     continue; xv 7^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) YIfPE{,  
    { CHWyy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); cdP+X'Y4D  
     bProcessed=TRUE; ))G%C6-  
    } Si*Pi  
   } GMgsM6.R  
  } d)r=W@tF]  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 0'BR Sa<  
   for(int index=0;index<MAX_KEY;index++){ 2{XQDOyA  
    if(hCallWnd[index]==NULL) U`<EpO{j|  
     continue; N iNZh;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) '_r|L1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); YcRjbF,|6  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ?8! 4!P%n  
   } i3;Z:,A4NN  
  } z=>]E 1'RL  
 } &!/L^Y*+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Ax0u \(p<^  
} qg:1  
cKF02?)TX  
  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: lUCdnp;w'  
{E6b/G?Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9eGM6qW\_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); SY<!-g<1F  
} %S1OQC  
  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: A[ /0on5r  
'4dnC2a]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5 ;dg#hO  
{ gA2\c5F<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) XV%L6x  
 { [:g6gAuh,  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 bMkn(_H)\  
  SaveBmp(); <LZvG IMl  
  return FALSE; )V)4N[?GC  
 } Q`AJR$L  
 …… //其它处理及默认处理 _rs!6tp  
} A_Sl#e  
 9<[RXY  
}#EiL !Pv  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 c4L5"_#`x-  
X"iy.@7  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 y"$|?187x  
./5|i*ow  
  二、编程步骤 a2Q9tt>Q  
:7:Nx`D8  
  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"; 1;vn*w`p  
^"6xE nA]  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 'n!;7*  
R*Pfc91}  
  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; YIgzFt[L  
c 0!bn b  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; q* Ns]f'a  
((EN&X,v  
  5、 添加代码,编译运行程序。 (.%:Q0i1  
7ou2SL}k  
三、程序代码 $Xz9xzOR  
kc~Z1  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL !p&M,6  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) %tUJ >qYU  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ nF A7@hsm  
#if _MSC_VER > 1000 ,W*<e-  
#pragma once z6'zNM7M  
#endif // _MSC_VER > 1000 @YpA'cX7  
#ifndef __AFXWIN_H__ "St,4 b  
#error include 'stdafx.h' before including this file for PCH _QY0j%W  
#endif 8"8sI  
#include "resource.h" // main symbols x*BfRj  
class CHookApp : public CWinApp 1K^/@^  
{ ^x 4,}'(  
 public: ,W{Qv<oo  
  CHookApp(); x3wyIio*  
  // Overrides SGNi~o  
  // ClassWizard generated virtual function overrides qUpMq:Uw  
  //{{AFX_VIRTUAL(CHookApp)  @tDVW *!  
 public: 9J% dd0  
  virtual BOOL InitInstance(); :8Q6=K87  
  virtual int ExitInstance(); fB  
  //}}AFX_VIRTUAL @f*/V e0.  
  //{{AFX_MSG(CHookApp) 5IdmKP|  
  // NOTE - the ClassWizard will add and remove member functions here. uO7Ti]H  
  // DO NOT EDIT what you see in these blocks of generated code ! YfxZ<  
  //}}AFX_MSG UvQxtT]  
  DECLARE_MESSAGE_MAP() 7OC ,KgJ3  
}; qG=`'%,m  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 2R2Z6}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); PcUi+[s;x  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Fo?2nQ<  
BOOL InitHotkey(); [uAfE3  
BOOL UnInit(); a}jaxGy  
#endif tJHzhH)  
KkAk(9Q/3  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. l<7 b  
#include "stdafx.h" X5>p~;[9  
#include "hook.h" 20%xD e  
#include <windowsx.h> Gtg; 6&2  
#ifdef _DEBUG zUwz[^d<C  
#define new DEBUG_NEW %I6iXq#  
#undef THIS_FILE )vuxy  
static char THIS_FILE[] = __FILE__; fKrOz! b  
#endif [|k@Suv |z  
#define MAX_KEY 100 O$$s]R6  
#define CTRLBIT 0x04 V)N9V|O'  
#define ALTBIT 0x02 IWm|6@y  
#define SHIFTBIT 0x01 S'6(&"XC H  
#pragma data_seg("shareddata") De4+4&  
HHOOK hHook =NULL; !R)v2Mk|  
UINT nHookCount =0; UnW,|n8  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey R['qBHQ?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT +(cs,?`\  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey TmzEZ<} &7  
static int KeyCount =0; x,>@IEN7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift zpg*hlv  
#pragma data_seg() 9-bDgzk   
HINSTANCE hins; #<v3G)|aS  
void VerifyWindow(); *]x]U >EF  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Ae`K 9  
//{{AFX_MSG_MAP(CHookApp) $qIMYX  
// NOTE - the ClassWizard will add and remove mapping macros here. evimnV  
// DO NOT EDIT what you see in these blocks of generated code! mKxQ U0`  
//}}AFX_MSG_MAP 17<\Q(YQ=  
END_MESSAGE_MAP() }4eSB  
+sgishqn9  
CHookApp::CHookApp() gR~XkU  
{ xQaN\):^8  
 // TODO: add construction code here, @xO< ~  
 // Place all significant initialization in InitInstance uiDR}   
} 47 m:z5;  
Dyt}"r\  
CHookApp theApp; D}\% Q #  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5 ^f>L2  
{ #{ `(;83  
 BOOL bProcessed=FALSE; Nv #vfh9}P  
 if(HC_ACTION==nCode) EVRg/ {X  
 { kCN9`9XI{  
  if((lParam&0xc0000000)==0xc0000000){// Key up \!G&:<h  
   switch(wParam) @Cw<wrem  
   { ,pf<"^li  
    case VK_MENU: &:'Uh W-t  
     MaskBits&=~ALTBIT; \ J9@p  
     break; oEKLuy  
    case VK_CONTROL: sbkWJy  
     MaskBits&=~CTRLBIT; &*MwKr<y  
     break; a#j0N5<Nl  
    case VK_SHIFT: N55;oj_K  
     MaskBits&=~SHIFTBIT; p0'A\@|  
     break; HtmJIH:  
    default: //judge the key and send message &W`yHQ"JY  
     break; /-G;#Wm  
   } DghX(rs_  
   for(int index=0;index<MAX_KEY;index++){ rDUNA@r  
    if(hCallWnd[index]==NULL) A[=)Zw "  
     continue; S37Bl5W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )}n`MRDB  
    { -4;{QB?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /e#_Yg  
     bProcessed=TRUE; u -CY-  
    } ,j9}VnW)  
   } R;'Pe>  
  } {$O.@#'  
  else if((lParam&0xc000ffff)==1){ //Key down 3EF|1B/5  
   switch(wParam) /`}C~  
   { p4HX83y{  
    case VK_MENU: gWgYZX  
     MaskBits|=ALTBIT; Q[`_Y3@j  
     break; 8Ay#6o  
    case VK_CONTROL: !Edc]rg7  
     MaskBits|=CTRLBIT; pmIQD"  
     break; 2$=?;~  
    case VK_SHIFT: jyLpe2 S  
     MaskBits|=SHIFTBIT; r`B8Cik  
     break; Vk@u|6U'  
    default: //judge the key and send message WR gAc%  
     break; ,MuLu,$/  
   } kJHUaXM  
   for(int index=0;index<MAX_KEY;index++) $*L@y m  
   { J3y5R1?EP  
    if(hCallWnd[index]==NULL) d!e$BiC  
     continue; Gzc{2"p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) osPX%k!yw  
    { Xk(c2s&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  V:F)m!   
     bProcessed=TRUE; IWuR=I$t  
    } &hyr""NkAm  
   } Y -o*d@  
  } m:II<tv  
  if(!bProcessed){ 5JIa?i>B  
   for(int index=0;index<MAX_KEY;index++){ pbR84g^p.S  
    if(hCallWnd[index]==NULL) $PHKI B(  
     continue; Y@_ i32,r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  4\dc  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); K (Z d-U  
   } 8O("o7~"  
  } HQ ^> ~  
 } }4 P@`>e/`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); IEjKI"  
} n=L;(jp<j  
+cQ4u4  
BOOL InitHotkey() u5$\E]+ _  
{ >77 /e@  
 if(hHook!=NULL){ =n i&*&  
  nHookCount++; 6>SP5|GG  
  return TRUE; lmQ!q>N  
 }   VG q'  
 else y<8)mw  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); R%8nR6iG"  
  if(hHook!=NULL) 9I+;waLlB  
   nHookCount++; - :*PXu  
  return (hHook!=NULL); r >u0Y  
} P_,f  
BOOL UnInit() ) ?+-Z2BwA  
{ OT{qb!eYI  
 if(nHookCount>1){ #@ 3RYx  
  nHookCount--; Pm#B'N#*N|  
  return TRUE; W>bhSKV%  
 } !+JSguy  
 BOOL unhooked = UnhookWindowsHookEx(hHook); %* vYX0W"  
 if(unhooked==TRUE){ 7 I&7YhFI  
  nHookCount=0; {YcVeCq+N  
  hHook=NULL; b+OLmd  
 } ]^3_eHa^d  
 return unhooked; OcQ_PE5\  
} zb?wl fT  
I{_St8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) o%Vf#W  
{ -=Q_E^'  
 BOOL bAdded=FALSE; y$r9Y!?s  
 for(int index=0;index<MAX_KEY;index++){ U^+9l?ol  
  if(hCallWnd[index]==0){ ?" {+m  
   hCallWnd[index]=hWnd; ga4 gH>4  
   HotKey[index]=cKey; 83412@&  
   HotKeyMask[index]=cMask; )XnG.T{0|  
   bAdded=TRUE; HsR#dp+s~  
   KeyCount++; @1*lmFq'kV  
   break; ,b-wo  
  } 2GqPS  
 } 28f-8B  
 return bAdded; 5caYA&R  
} N>/*)Frt  
[YHvyfk~_  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) zv@'x nY]  
{ ojs&W]r0Z  
 BOOL bRemoved=FALSE; i\3BA"ZX  
 for(int index=0;index<MAX_KEY;index++){ /q uf'CV}  
  if(hCallWnd[index]==hWnd){ W ;P1T"*A  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ' uo`-Y  
    hCallWnd[index]=NULL; u5H#(&Om  
    HotKey[index]=0; }<2F]UuR  
    HotKeyMask[index]=0; ![7v_l\Q  
    bRemoved=TRUE; }(a y(  
    KeyCount--; Te[[xhTyw  
    break; j /)cdP  
   } pEH[fA]  
  } >u*woNw(XM  
 } d=oOMXYa   
 return bRemoved; I%e7:cs>  
} JV36@DVQ  
7Kk rfJqN  
void VerifyWindow() }h +a8@  
{ i_`YZ7Hxp  
 for(int i=0;i<MAX_KEY;i++){ DECX18D  
  if(hCallWnd!=NULL){ / v5Pk.!o  
   if(!IsWindow(hCallWnd)){ 7KRc^ *pZs  
    hCallWnd=NULL; ~e 6yaX8S  
    HotKey=0; O.& 6J/  
    HotKeyMask=0; yZ0;\Tr*J  
    KeyCount--; @ RTQJ+ms  
   } mH;Z_ME"  
  } O<6/0ub&+h  
 } :{_Or'L  
} q E$ .a[  
zesEbR)j  
BOOL CHookApp::InitInstance() uqTOEHH7  
{ F|xXMpC.f  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); O3bK>9<K  
 hins=AfxGetInstanceHandle(); `Jm{K*&8Q  
 InitHotkey(); oxO}m7 ULH  
 return CWinApp::InitInstance(); :e+GtN?  
} e!tgWYN  
<' P|g  
int CHookApp::ExitInstance() 1G.+)*:3  
{ QAygr4\X^  
 VerifyWindow(); 2-j|q6m5  
 UnInit(); Qi=rhN`  
 return CWinApp::ExitInstance(); T2Y`q'  
} R&ou4Y:DG  
lmH!I )5  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file rt^z#2$  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) *ivbk /8  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Zr}`W \  
#if _MSC_VER > 1000 pxI*vgfN7  
#pragma once JGj_{|=:  
#endif // _MSC_VER > 1000 <( BAws(X  
1 _5[5K^  
class CCaptureDlg : public CDialog C>T6{$xkC  
{ <>j, Q  
 // Construction *zX<`E  
 public: =_^g]?5i  
  BOOL bTray; ik8e  
  BOOL bRegistered; `d OjCA_&  
  BOOL RegisterHotkey(); pM(y?zGt  
  UCHAR cKey; :\4O9f*5+  
  UCHAR cMask; })mez[UmZ  
  void DeleteIcon(); U}gYZi;;$  
  void AddIcon(); JiI(?I  
  UINT nCount; U-WrZ|-  
  void SaveBmp(); \R79^  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor p-*BB_J"  
  // Dialog Data Xo%Anqk  
  //{{AFX_DATA(CCaptureDlg) `&pb`P<`  
  enum { IDD = IDD_CAPTURE_DIALOG }; _F@FcFG1Z*  
  CComboBox m_Key; ,x{5,K.yWq  
  BOOL m_bControl; F6%rH$aS  
  BOOL m_bAlt; ;A- Ef  
  BOOL m_bShift; 6\::Ku4_2  
  CString m_Path; dcHkb,HsO  
  CString m_Number; >$R-:>~zN  
  //}}AFX_DATA jDXmre?  
  // ClassWizard generated virtual function overrides _ORW'(:Z  
  //{{AFX_VIRTUAL(CCaptureDlg) ^+GN8LUs  
 public: ?7G[`@^Y  
  virtual BOOL PreTranslateMessage(MSG* pMsg); p%3';7W\  
 protected: #(  kT  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support b]|7{yMV  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); A=XM(2{aN  
  //}}AFX_VIRTUAL H.>KYiv+  
  // Implementation Ei}DA=:s  
 protected: ?|s[/zPS=  
  HICON m_hIcon; xFpJ#S&  
  // Generated message map functions ^xqh!  
  //{{AFX_MSG(CCaptureDlg) c#Y9L+O  
  virtual BOOL OnInitDialog(); u{H_q&1  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); koqH~>ZtD  
  afx_msg void OnPaint(); b%)a5H(  
  afx_msg HCURSOR OnQueryDragIcon(); C y& L,  
  virtual void OnCancel(); {ld([  
  afx_msg void OnAbout(); .S5&MNE  
  afx_msg void OnBrowse(); GbL,k? ey  
  afx_msg void OnChange(); 8=2)I.   
 //}}AFX_MSG D~mGv1t"  
 DECLARE_MESSAGE_MAP() 4cV(Z-\  
}; *S=v1 s/  
#endif }'@*Olj  
~?L. n:wu  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file i, )kI  
#include "stdafx.h" ;c;;cJc!  
#include "Capture.h" `mWg$e,  
#include "CaptureDlg.h" A$5!]+  
#include <windowsx.h> -7pZRnv  
#pragma comment(lib,"hook.lib") l[.pI];T  
#ifdef _DEBUG !MGQ+bD6  
#define new DEBUG_NEW Y.}n,y|J}  
#undef THIS_FILE "arbUX~d  
static char THIS_FILE[] = __FILE__; gqC:r,a  
#endif Gm6^BYCk  
#define IDM_SHELL WM_USER+1 ,$*IJeKx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wiFckF/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  z!F?#L5  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; t;4{l`dk  
class CAboutDlg : public CDialog `[:f;2(@  
{ ZAiQofQ:2  
 public: ]0O pd9  
  CAboutDlg(); /Wj9Stj5  
  // Dialog Data G4=v2_]  
  //{{AFX_DATA(CAboutDlg) 9^aMmN&6N2  
  enum { IDD = IDD_ABOUTBOX }; :_?>3c}L  
  //}}AFX_DATA GJ((eAS)  
  // ClassWizard generated virtual function overrides +Uk/Zg w^  
  //{{AFX_VIRTUAL(CAboutDlg) "urQUpF  
 protected: tZ6KU11O  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ^c!Hur6)  
  //}}AFX_VIRTUAL (>Tu~Vo  
  // Implementation =UYc~VUYnT  
 protected: ~5JXY5 *o  
  //{{AFX_MSG(CAboutDlg) U~T/f-CT  
  //}}AFX_MSG ,m:MI/ )p  
  DECLARE_MESSAGE_MAP() {WC{T2:8  
}; SYC_=X  
+ 1cK (Si  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) $)\ocsO  
{ :ox+WY  
 //{{AFX_DATA_INIT(CAboutDlg) aIm\tPbb  
 //}}AFX_DATA_INIT 2?m'Dy'JE  
} ND I|;   
,ur_n7+LH  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1YS{; y[o  
{ g.,IQ4o  
 CDialog::DoDataExchange(pDX); ,7/N=mz  
 //{{AFX_DATA_MAP(CAboutDlg) M/#<=XhA  
 //}}AFX_DATA_MAP [1Vh3~>J6  
} un..UU4  
W/&cnp\  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) p'_* >%4~  
 //{{AFX_MSG_MAP(CAboutDlg) .=K@M"5&  
 // No message handlers G8<,\mg+  
 //}}AFX_MSG_MAP /r]IY.  
END_MESSAGE_MAP() WAob"`8]  
Ao=.=0os  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) g8B@M*JA  
: CDialog(CCaptureDlg::IDD, pParent) lJ}lO,g  
{ ;zp0,[r  
 //{{AFX_DATA_INIT(CCaptureDlg) g y&B"`  
  m_bControl = FALSE; 7 bpV=  
  m_bAlt = FALSE; :.Np7[~{  
  m_bShift = FALSE; 'KXvn0  
  m_Path = _T("c:\\"); tTP"*Bb  
  m_Number = _T("0 picture captured."); %pV/(/Q  
  nCount=0; 0A|.ch  
  bRegistered=FALSE; f4:g D*YT  
  bTray=FALSE; /tV)8pEj  
 //}}AFX_DATA_INIT PCD1I98  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Pirc49c  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 4m%_#J{  
} b~cN#w #  
 @4H*kA  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) WzZb-F  
{ Z.rKV}yjY  
 CDialog::DoDataExchange(pDX); 0h$23.  
 //{{AFX_DATA_MAP(CCaptureDlg) mNs&*h}  
  DDX_Control(pDX, IDC_KEY, m_Key); 7zy6`O P  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); bl:.D~@  
  DDX_Check(pDX, IDC_ALT, m_bAlt); jYuH zf  
  DDX_Check(pDX, IDC_SHIFT, m_bShift);  &grT}  
  DDX_Text(pDX, IDC_PATH, m_Path); H{9di\xnEm  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ^TnBtIU-B  
 //}}AFX_DATA_MAP p"Fj6T2  
} O~w&4F;{  
Rsqb<+7  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ULAAY$o@5  
//{{AFX_MSG_MAP(CCaptureDlg) 7X1T9'j I2  
 ON_WM_SYSCOMMAND() KLlW\MF1  
 ON_WM_PAINT() *qGxQ?/  
 ON_WM_QUERYDRAGICON() j@Z4(X L  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) $\{@wL  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) lS9rgq<n  
 ON_BN_CLICKED(ID_CHANGE, OnChange) P b2exS(  
//}}AFX_MSG_MAP ZOfyy E  
END_MESSAGE_MAP() hesL$Z [  
,%yjEO  
BOOL CCaptureDlg::OnInitDialog() vA:1z$m  
{ BPe5c :z  
 CDialog::OnInitDialog(); h_Q9 c  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 0I& !a$:  
 ASSERT(IDM_ABOUTBOX < 0xF000); {_l@ws  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Bo_Ivhe[m  
 if (pSysMenu != NULL) 9>\s81^  
 { 8 <EE4y  
  CString strAboutMenu; ~[isR|>  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 27G6C`}  
  if (!strAboutMenu.IsEmpty()) TU7Qt<  
  { t%V!SvT8+  
   pSysMenu->AppendMenu(MF_SEPARATOR); 8`kK)iCq  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Mb uD8B  
  } XeKIue@_  
 } HTvA]-AuM  
 SetIcon(m_hIcon, TRUE); // Set big icon 8( 7DW |\  
 SetIcon(m_hIcon, FALSE); // Set small icon +P81&CaY  
 m_Key.SetCurSel(0); Hh4$Qr;R  
 RegisterHotkey(); BUuNI_?M#5  
 CMenu* pMenu=GetSystemMenu(FALSE); iLNKC'  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); JZ]4?_l  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); tJ i#bg%  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); b_:]Y<{> f  
 return TRUE; // return TRUE unless you set the focus to a control m "h{HgJd  
} seB ^o}  
}RDGk+x7|  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) oxha8CF]D  
{ >7p?^*&7;  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) u-$(TyDEl|  
 { vzd1:'^t  
  CAboutDlg dlgAbout; y08.R. l  
  dlgAbout.DoModal(); |Xlpgdiu  
 } 4(f[Z9 iZ]  
 else 8lg $]  
 { bO8g#rO  
  CDialog::OnSysCommand(nID, lParam); @GK0j"_  
 } /Z94<}C6b  
}  bF0 y`  
4%0eX]  
void CCaptureDlg::OnPaint() Cq(dj^/~m  
{ Xk8+m>   
 if (IsIconic()) esIE i!d  
 { mw-0n  
  CPaintDC dc(this); // device context for painting ` <cB 6  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); q~48lxDU  
  // Center icon in client rectangle ! av B&Z  
  int cxIcon = GetSystemMetrics(SM_CXICON); ?k CK$P  
  int cyIcon = GetSystemMetrics(SM_CYICON); D .oX>L#:  
  CRect rect; ^y]CHr  
  GetClientRect(&rect); o['HiX  
  int x = (rect.Width() - cxIcon + 1) / 2; aqSHo2]DX9  
  int y = (rect.Height() - cyIcon + 1) / 2; ^OnU;8IC  
  // Draw the icon \!Cix}}1  
  dc.DrawIcon(x, y, m_hIcon); Gt3V}"B3\  
 } [#.E=s+&  
 else m-dyvW+  
 { AK]{^Hvz  
  CDialog::OnPaint(); ) wtVFG  
 } >7[. {Y  
} ;Kob]b  
01uMbtM  
HCURSOR CCaptureDlg::OnQueryDragIcon() Y?a*-"  
{ wC+_S*M-K  
 return (HCURSOR) m_hIcon; L<'3O),}  
} dbQUW#<Q  
BT.;l I  
void CCaptureDlg::OnCancel()  \09eH[  
{ _~ZNX+4  
 if(bTray) /7/d u[P6  
  DeleteIcon(); OX d617  
  CDialog::OnCancel(); B2w\  
} -!f)P=S  
"l&=a1l  
void CCaptureDlg::OnAbout() ) jv]Oz  
{ TPH`{  
 CAboutDlg dlg; [DpGL/Y.  
 dlg.DoModal(); RY3ANEu+  
} /Uth#s:  
=NMT H[  
void CCaptureDlg::OnBrowse() VJmX@zX9  
{ xOnbY U  
 CString str; |WqEJ*$,  
 BROWSEINFO bi; r2M Iw  
 char name[MAX_PATH]; (&HAjB  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Ir'(GB  
 bi.hwndOwner=GetSafeHwnd(); D/uGL t~D(  
 bi.pszDisplayName=name; v10p]=HmO  
 bi.lpszTitle="Select folder"; _H@Y%"ZHJ6  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ,#:*dl  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6;6a.iZ  
 if(idl==NULL) (hWr!(>C4]  
  return; \n$s5i-  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); G- wQ weJ9  
 str.ReleaseBuffer(); +aR.t@D+"Y  
 m_Path=str; D;VQoO  
 if(str.GetAt(str.GetLength()-1)!='\\') d$Y3 a^O|  
  m_Path+="\\"; RZ 4xR  
 UpdateData(FALSE); {G$I|<MD2T  
} zO8`xrN!  
mO<sw  
void CCaptureDlg::SaveBmp() d*Q:[RUf,  
{ 41Bp^R}^/  
 CDC dc; s3@sX_2  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); t>.1,'zb  
 CBitmap bm; [!1z; /  
 int Width=GetSystemMetrics(SM_CXSCREEN); 2NHuZ.af  
 int Height=GetSystemMetrics(SM_CYSCREEN); VtIPw&KHW  
 bm.CreateCompatibleBitmap(&dc,Width,Height); erTb9`N4  
 CDC tdc; f'P}]_3(  
 tdc.CreateCompatibleDC(&dc); =2!AK[KxX  
 CBitmap*pOld=tdc.SelectObject(&bm); xEdCGwgp#  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); `7_=2C  
 tdc.SelectObject(pOld); DID&fj9m  
 BITMAP btm; swNJ\m  
 bm.GetBitmap(&btm); pie<jZt  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; OjO$.ecT  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); jyQ Bx  
 BITMAPINFOHEADER bih; ;Yo9e~  
 bih.biBitCount=btm.bmBitsPixel; wgfy; #  
 bih.biClrImportant=0; ^T*^L=L_(  
 bih.biClrUsed=0; x}Qet4vV  
 bih.biCompression=0; dJID '2a  
 bih.biHeight=btm.bmHeight; Xvu|ss  
 bih.biPlanes=1; y Nb&;E7 H  
 bih.biSize=sizeof(BITMAPINFOHEADER); .I\)1kjX  
 bih.biSizeImage=size; hDa I@_86  
 bih.biWidth=btm.bmWidth; *%< Ku&C  
 bih.biXPelsPerMeter=0; ;ELQIHnD"  
 bih.biYPelsPerMeter=0; DwM4/m  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); (}E-+:vFU  
 static int filecount=0; uX_A4ht*  
 CString name; . +_IpygQ  
 name.Format("pict%04d.bmp",filecount++); G tI]6t  
 name=m_Path+name; j$r.&,m  
 BITMAPFILEHEADER bfh; ~um+r],@@  
 bfh.bfReserved1=bfh.bfReserved2=0; ;m6Mm`[i<  
 bfh.bfType=((WORD)('M'<< 8)|'B'); BkfWZ O{7  
 bfh.bfSize=54+size; \bAsn89O  
 bfh.bfOffBits=54; E><!Owxt/  
 CFile bf; F%QZe*m[  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ p_h)|*W{  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +9Z RCmV  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 4 4%jz-m  
  bf.WriteHuge(lpData,size); k#"Pv"  
  bf.Close(); Ij; =  
  nCount++; V"":_`1VW  
 } V# Mw  
 GlobalFreePtr(lpData); bSHlR#!6  
 if(nCount==1) N_S>%Z+  
  m_Number.Format("%d picture captured.",nCount); LL3RC6;e  
 else G#n99X@-  
  m_Number.Format("%d pictures captured.",nCount); T3 xr Ua&  
  UpdateData(FALSE); `< 8Fc`;[  
} BOqq=WY  
d bU  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) h.0Y!'?  
{ XvBEC_xWZ  
 if(pMsg -> message == WM_KEYDOWN) SPKen}g  
 { ?m-kpW8  
  if(pMsg -> wParam == VK_ESCAPE) Y68`B"3  
   return TRUE; 9HMW!DSK`  
  if(pMsg -> wParam == VK_RETURN) <}'hkEh{d=  
   return TRUE; pKK&+umg  
 } 3$f%{~3  
 return CDialog::PreTranslateMessage(pMsg); w`XwW#!}@$  
} K@xp!  
/Z<"6g?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Dz, Fu:)  
{ .N~qpynY  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Yh/-6wg  
  SaveBmp(); $$YLAgO4  
  return FALSE; 4/D ~H+k  
} v8g3]MVj3  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ pJ7wd~wF*  
 CMenu pop; B.fLgQK0  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); FxOhF03\=[  
 CMenu*pMenu=pop.GetSubMenu(0); }%k,PYe/  
 pMenu->SetDefaultItem(ID_EXITICON); :@g@jcbYq`  
 CPoint pt; #$V`%2>  
 GetCursorPos(&pt); =QEg~sD^)s  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); rC]jz$sle  
 if(id==ID_EXITICON) aM'0O![d  
  DeleteIcon(); ,-u | l  
 else if(id==ID_EXIT) =!NYvwg6;o  
  OnCancel(); I%xrDiK97  
 return FALSE; }i_[wq{E&  
} lv9Ss-c4  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 'qLk"   
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) j9C=m"O  
 AddIcon(); =0xuH>WY}w  
 return res; b!hxx Z  
} u&l2s&i  
R =HN>(U  
void CCaptureDlg::AddIcon() S |T:rc(~  
{ ?!(/;RU1  
 NOTIFYICONDATA data; W.p->,N  
 data.cbSize=sizeof(NOTIFYICONDATA); GV)#>PL  
 CString tip; e 1{t qNJ  
 tip.LoadString(IDS_ICONTIP); bj` cYL%  
 data.hIcon=GetIcon(0); ]!H*oP8a*  
 data.hWnd=GetSafeHwnd(); q|2{W.P5qi  
 strcpy(data.szTip,tip); ;}IF'ANA  
 data.uCallbackMessage=IDM_SHELL; ~Av]LW  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; SqY;2:  
 data.uID=98; jM J[6qj  
 Shell_NotifyIcon(NIM_ADD,&data); M0o=bYI  
 ShowWindow(SW_HIDE); Y%qhgzz?/  
 bTray=TRUE; sBp|Lo  
} FsZM_0>/s  
><OdHRh@#  
void CCaptureDlg::DeleteIcon() z2t;!]"'l  
{ "Gcr1$xG8!  
 NOTIFYICONDATA data; h./cs'&  
 data.cbSize=sizeof(NOTIFYICONDATA); ?zUV3Qgzj  
 data.hWnd=GetSafeHwnd(); ~bT0gIc  
 data.uID=98; hXS'*vO"  
 Shell_NotifyIcon(NIM_DELETE,&data); bf3LNV|  
 ShowWindow(SW_SHOW); "n '*_rh>+  
 SetForegroundWindow(); G/(oQA  
 ShowWindow(SW_SHOWNORMAL); @FkNT~OZ  
 bTray=FALSE; If6wkY6sR  
} P>euUVMPz4  
.^#{rk  
void CCaptureDlg::OnChange() 'N='B<^;%  
{ eFXxkWR)  
 RegisterHotkey(); -a3+C,I8g  
} 3f's>+,#%  
/@FB;`'  
BOOL CCaptureDlg::RegisterHotkey() 5`oor86  
{ W_8 FzXA  
 UpdateData(); =YA%= d_  
 UCHAR mask=0; SiojOH  
 UCHAR key=0; #Vn=(U4}!_  
 if(m_bControl) m'k`p5[=h  
  mask|=4; &g,K5at  
 if(m_bAlt) R2Tvo?xI7  
  mask|=2; ?-<t-3%hyV  
 if(m_bShift) !=&]#-;b  
  mask|=1; <)Kjf/x  
  key=Key_Table[m_Key.GetCurSel()]; < Q\`2{  
 if(bRegistered){ _1y|#o  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 2EE/xnwX  
  bRegistered=FALSE; H?40yu2m5  
 } O,qR$#l   
 cMask=mask; hv*n";V   
 cKey=key; )2YU|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); pRc(>P3;  
 return bRegistered; y(.WK8  
} !nVX .m9  
IvIBf2D;Q  
  四、小结 NL&g/4A[a  
l[G ,sq"  
  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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