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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: F) {f{-@)  
  }!0,(<EsV  
  一、实现方法 nf,>l0,,'  
yZHQql%J O  
  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: m(y?3} h  
t"2WJ-1k}  
#pragma data_seg("shareddata") @_Aqk{3  
HHOOK hHook =NULL; //钩子句柄 ^4Tr @g#]"  
UINT nHookCount =0; //挂接的程序数目 }CsUZ&*&  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 5U|f"3&8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 86/CA[Y-  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey L}nj#z4g  
static int KeyCount =0; cy)L%`(7  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 sa#=#0yg  
#pragma data_seg() $MKx\qx}  
1(w0* `  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ]WN{8   
o80pmy7@  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: x?:WR*5w  
g0rdF  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR j!mI9*hP  
cKey,UCHAR cMask) aP8Im1<A  
{ )7q;F m_/  
 BOOL bAdded=FALSE; g]$>G0E`oD  
 for(int index=0;index<MAX_KEY;index++){ 1kio.9NIp  
  if(hCallWnd[index]==0){ 1dfA 8=L,s  
   hCallWnd[index]=hWnd; '0H +2  
   HotKey[index]=cKey; 8PXleAn  
   HotKeyMask[index]=cMask; VOG DD@  
   bAdded=TRUE; F5:*;E;$  
   KeyCount++; :J(a;/~ip  
   break; U(W#H|  
  } )#ic"UtR  
 } j V:U%  
 return bAdded; m%ET!+  
} &lBfW$PZjk  
//删除热键 /Ia=/Jj7N  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hx)Ed  
{ KPW: r#d  
 BOOL bRemoved=FALSE; |t]-a%A=w  
 for(int index=0;index<MAX_KEY;index++){ 3(^9K2.s}  
  if(hCallWnd[index]==hWnd){ *2 MUG h  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ fQ#mx.|8y  
    hCallWnd[index]=NULL; >P\T nb"Q\  
    HotKey[index]=0; Fj1/B0acS  
    HotKeyMask[index]=0; %|SbZ)gcQ  
    bRemoved=TRUE; ,>{4*PM(  
    KeyCount--; X?>S24I"9  
    break; ^%go\ C ;  
   } wjS3ItB  
  } l-t:7`=|  
 } YvBUx#\  
 return bRemoved; b\=0[kBQw  
} ;a{ Dr  
C9gF2ii|?  
deHBY4@  
  DLL中的钩子函数如下: ywq{9)vq  
!G\1$"T$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8"oS1W  
{ w$Dp m.0(  
 BOOL bProcessed=FALSE;  V}8J&(\  
 if(HC_ACTION==nCode) w/YKWv{_S  
 { 4yRT!k}o  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Ba`]Sm=  
   switch(wParam) qf)]!w U9  
   {  C!qW:H  
    case VK_MENU: xBB:b\  
     MaskBits&=~ALTBIT; WpTC,~-  
     break; $|(roC(  
    case VK_CONTROL: }{iR+M X  
     MaskBits&=~CTRLBIT; 14oD^`-t  
     break;  M?}2  
    case VK_SHIFT: C,tlp  
     MaskBits&=~SHIFTBIT; >kC@7h5)  
     break; ]NTHit^EX  
    default: //judge the key and send message kdxs{b"t  
     break; ,wX/cUyZ  
   } .WyI.Y1  
   for(int index=0;index<MAX_KEY;index++){ E8%O+x}  
    if(hCallWnd[index]==NULL) ,j&o H$mW  
     continue; #7Qn\C2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]t(g7lc}U  
    { /&kZ)XOi  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Yn J=&21  
     bProcessed=TRUE; ?_HTOOa  
    } !o*oT}6n  
   } j:<E=[Kl  
  } i]Kq  
  else if((lParam&0xc000ffff)==1){ //有键按下 [W^6=7EO  
   switch(wParam) -(:BkA  
   { K<s\:$VVh  
    case VK_MENU: ^gb2=gWZ<  
     MaskBits|=ALTBIT; 3c9v~5og4  
     break; :dLS+cTC  
    case VK_CONTROL: m{b(^K9}  
     MaskBits|=CTRLBIT; 2a? d:21 B  
     break; D;Az>]>q  
    case VK_SHIFT: &X|z(vSJ$  
     MaskBits|=SHIFTBIT; 3*8#cSQ/6o  
     break; YJ3970c/M  
    default: //judge the key and send message T*YdGIFO  
     break; l8^^ O   
   } r43dnwX  
   for(int index=0;index<MAX_KEY;index++){ |nm,5gPNC  
    if(hCallWnd[index]==NULL) Yq1 ~"he8  
     continue; jRgv 8n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M.|hnGX N  
    { o^7NZ]m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Ui?t@.  
     bProcessed=TRUE; 'BUdySng  
    } ^]aDLjD  
   } P6IhpB59  
  } YdeSJ(:  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 j5$Sm  
   for(int index=0;index<MAX_KEY;index++){ ss,6;wfX  
    if(hCallWnd[index]==NULL) .bpxSU%X  
     continue; eQ C`e#%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) j4G,Z4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Q%t8cJ L  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ?dxhe7m  
   } @<alWBS  
  } ?+5K2Zk  
 } c&'T By  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]^ j)4us  
} Dm4\Rld{  
8dL(cC  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: !sR`]0  
^[qmELW#7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); OM, uR3,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p=Vm{i7  
NEJ Nu_Z  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ^-=,q.[7  
RQe#X6'h  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Rjh/M`|  
{ t%8*$"~X  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) #>>-:?X  
 { =&}dP%3LC)  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 "I+wU`AIek  
  SaveBmp(); ,&l>^w/  
  return FALSE; 1lMU('r%  
 } '9^x"U9c  
 …… //其它处理及默认处理 e%UFY-2  
} W6wgX0H  
@$~%C) %u  
jfgAI7;b  
  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。 $vc:u6I[  
}|A%2!Q}  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 #kV= ;(lq  
*4r;H2%c  
  二、编程步骤 (( t8  
t@!oc"z}@  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; HYpB]<F  
1[B?nk  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ]1p&*xX:Bj  
}hl# e[$  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; u^:!!Suo  
fv`%w  
  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; lDAw0 C3  
4'_uN$${$  
  5、 添加代码,编译运行程序。 se(_`a/4Q  
=\_MJ?A$  
三、程序代码 A u(Ngq  
!xa,[$w(^  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL v?Y9z!M  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) +gT?{;3[i  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ - d>)  
#if _MSC_VER > 1000 BH%eu 7`t  
#pragma once tR2IjvmsX  
#endif // _MSC_VER > 1000 (^057  
#ifndef __AFXWIN_H__ *a+~bX)18  
#error include 'stdafx.h' before including this file for PCH )7J@A%u  
#endif odj|" ZK  
#include "resource.h" // main symbols _>&zhw2  
class CHookApp : public CWinApp BU])@~$  
{ qFvtqv2  
 public: m: w/[|_  
  CHookApp(); :Fm+X[n  
  // Overrides Pm;"Y!S<  
  // ClassWizard generated virtual function overrides #ljfcQm  
  //{{AFX_VIRTUAL(CHookApp) ,hX03P-X  
 public: J6::(0HM  
  virtual BOOL InitInstance(); -*tP_=-Dg  
  virtual int ExitInstance(); WvN5IHo 8i  
  //}}AFX_VIRTUAL *S{%+1F  
  //{{AFX_MSG(CHookApp) PVV\@  
  // NOTE - the ClassWizard will add and remove member functions here. &HW%0lTs%  
  // DO NOT EDIT what you see in these blocks of generated code ! z!t &zkAK  
  //}}AFX_MSG ##yi^;3Y  
  DECLARE_MESSAGE_MAP() t5e%"}>7H  
}; |4 wVWJ7   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); e9N 1xB  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O7q-MeMM  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]36R_Dp  
BOOL InitHotkey(); TQbhK^]  
BOOL UnInit(); rX fQ_  
#endif '<8ewU  
9I9J}&4  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. /t ,ujTK  
#include "stdafx.h" 2<Ub[R  
#include "hook.h" :^?ZVi59j  
#include <windowsx.h> ,R*ru*  
#ifdef _DEBUG f*kT7PJG  
#define new DEBUG_NEW xOD;pRZQ  
#undef THIS_FILE m"@M~~bh  
static char THIS_FILE[] = __FILE__; >*Y~I0>  
#endif ,?i#NN5p  
#define MAX_KEY 100 K+Ehj(eF  
#define CTRLBIT 0x04 Yc\;`C  
#define ALTBIT 0x02  ae#7*B  
#define SHIFTBIT 0x01 8a e]tX5$  
#pragma data_seg("shareddata") q6/ o.j   
HHOOK hHook =NULL; }^P(p?~  
UINT nHookCount =0; ?u 9) GJO[  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey t</Kel|D  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT /koNcpJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 'du:Bxl`d4  
static int KeyCount =0; (q3(bH~T)  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift I)DLnnQQ  
#pragma data_seg() j3z&0sc2(0  
HINSTANCE hins; Z\O ,9  
void VerifyWindow(); &|Z:8]'P  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) T4qbyui{  
//{{AFX_MSG_MAP(CHookApp) ugucq},[  
// NOTE - the ClassWizard will add and remove mapping macros here. 6}{2W<  
// DO NOT EDIT what you see in these blocks of generated code! S 8h/AW6l  
//}}AFX_MSG_MAP Q|+m)A4@  
END_MESSAGE_MAP() lHz:Iibt  
n5oB#>tI0  
CHookApp::CHookApp() )"|g&=  
{ Bn47O~  
 // TODO: add construction code here, ]?mWnEi!z  
 // Place all significant initialization in InitInstance w doA>a?q  
} Cl4y9|  
vF3>nN(]  
CHookApp theApp; R7Hn8;..  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 56&s'  
{ N;RZIg(x  
 BOOL bProcessed=FALSE; T" 8>6a@}E  
 if(HC_ACTION==nCode) &=t$ AIu  
 { BI,K?D&W-  
  if((lParam&0xc0000000)==0xc0000000){// Key up 7f[nNng  
   switch(wParam) #`v`e"  
   { BJ~Q\Si6  
    case VK_MENU: ~F>oNbJIv  
     MaskBits&=~ALTBIT; kzgH p,;R{  
     break; t3v*P6  
    case VK_CONTROL: pg*'2AT  
     MaskBits&=~CTRLBIT; #j iQa"  
     break; 0>VgO{X  
    case VK_SHIFT: k`2 K?9\  
     MaskBits&=~SHIFTBIT; xWn.vSos  
     break; D-A#{e _  
    default: //judge the key and send message Hfm4  
     break; 7^as~5'&-  
   } W"VN2  
   for(int index=0;index<MAX_KEY;index++){ 44RZk|U1J{  
    if(hCallWnd[index]==NULL) :#c?`>uV  
     continue; W{ @lt}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) S1E2E3  
    { lb`P9mbr+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); x-CY G?-x  
     bProcessed=TRUE; W&BwBp]K  
    } %w6> 3#e  
   }  CG$S?  
  } }B^s!y&b  
  else if((lParam&0xc000ffff)==1){ //Key down ZEUd?"gaR  
   switch(wParam) G-bG}9vc]  
   { Nr3td`;  
    case VK_MENU: 7:{4'Wr@6|  
     MaskBits|=ALTBIT; :14O=C  
     break; p5c'gziR  
    case VK_CONTROL: m!N_TOl-^  
     MaskBits|=CTRLBIT; q;tsA"l  
     break; (fm\kV  
    case VK_SHIFT: = J).(E89  
     MaskBits|=SHIFTBIT; tG{e(  
     break; "p2 $R*ie  
    default: //judge the key and send message v#YO3nD  
     break; 1}KNzMHk9  
   } (3c,;koRR  
   for(int index=0;index<MAX_KEY;index++) _Vj O [hx  
   { :[|`&_D9J  
    if(hCallWnd[index]==NULL) a5L#c=  
     continue; 'rp(k\ pY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J Y %B:  
    { qC.jXU?rO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;QREwT~H  
     bProcessed=TRUE; 4U C/pGZY  
    } pk: ruf`)  
   } &Mo=V4i>  
  } Nd^9.6,JU  
  if(!bProcessed){ T* -*U /  
   for(int index=0;index<MAX_KEY;index++){ @\u)k  
    if(hCallWnd[index]==NULL) %jKR\f G  
     continue; 3,3{wGvHHW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /=,^fCCN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); roj/GZAy"  
   } m5{Y  
  } Nz*qz"T  
 } ;wJLH\/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); m*CIbkDsZ  
} VGWqy4m  
,'={/)c<  
BOOL InitHotkey() CH`4FR.-  
{ B~u{Lv TE  
 if(hHook!=NULL){ ElqHZ$a?  
  nHookCount++; >^D"%Oj y  
  return TRUE; [M@i,d-;A  
 } qSkt }F%'  
 else OA4NXl'  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); RvYew!n  
  if(hHook!=NULL) }@SZ!-t%rD  
   nHookCount++; ~k|~Q\   
  return (hHook!=NULL); 6"-LGK:  
} hSp[BsF`,  
BOOL UnInit() A{y3yH`#h  
{ 3vQ?vS|2  
 if(nHookCount>1){ hY-;Wfg  
  nHookCount--; UyD=x(li  
  return TRUE; H,:Cg:E/^  
 } b;9v.MZ4>g  
 BOOL unhooked = UnhookWindowsHookEx(hHook); *G'zES0x  
 if(unhooked==TRUE){ @T?:[nPf&F  
  nHookCount=0; a%Mbq;  
  hHook=NULL; K34ca-~  
 } ;# {XNq<1  
 return unhooked; FspI[g UN,  
} J);1Tpm  
(<itE3P  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]/JE#  
{ A9p$5jt7  
 BOOL bAdded=FALSE; A6q,"BS^d  
 for(int index=0;index<MAX_KEY;index++){ f.V0uBDN  
  if(hCallWnd[index]==0){ qaG%PH}a  
   hCallWnd[index]=hWnd; jR }h3!  
   HotKey[index]=cKey; 1#aOgvf  
   HotKeyMask[index]=cMask; >~>=[M0  
   bAdded=TRUE; D'|#5>G  
   KeyCount++; ?u'JhZ  
   break; }I; =IYrN  
  } aNv6 "  
 } }Jjq]lW  
 return bAdded; [~f%z(vI  
} g3e\'B'  
@D[;$YEk  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) X7NRQ3P@  
{ ',*I=JW;  
 BOOL bRemoved=FALSE; (^eE8j/K  
 for(int index=0;index<MAX_KEY;index++){ vh KA8vr  
  if(hCallWnd[index]==hWnd){ }\*dD2qNL}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ czdNqk.kh  
    hCallWnd[index]=NULL; 0O!%NL[,  
    HotKey[index]=0; 42U3>  
    HotKeyMask[index]=0; W%Br%VQJ  
    bRemoved=TRUE; frc>0\  
    KeyCount--; 1a/@eqF''  
    break; +@usJkxul  
   } v|t^th,  
  } rZ w&[ G  
 } Ij@YOt  
 return bRemoved; ~" }t8`vP1  
} '`/1?,=  
dH&N<  
void VerifyWindow() ?!Rl p/  
{ X<,sc;"b`k  
 for(int i=0;i<MAX_KEY;i++){ OHp 121  
  if(hCallWnd!=NULL){ ra_`NsKF}  
   if(!IsWindow(hCallWnd)){ ^0~?3t5  
    hCallWnd=NULL; V8[woJ5x  
    HotKey=0; lJ R",_  
    HotKeyMask=0; CuT[V?^iD  
    KeyCount--; UKMrR9[x*  
   } &R\ .^3  
  } jW?.>(  
 } VSmshld  
} #E{OOcM  
1wE~dpnx  
BOOL CHookApp::InitInstance() @~QW~{y  
{ uH65DI<  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); gPQ2i])"Q  
 hins=AfxGetInstanceHandle(); rguC#Xt!4  
 InitHotkey(); #x':qBv#  
 return CWinApp::InitInstance(); -.ha\t0J  
} HQQc<7c ",  
j9x}D;? n  
int CHookApp::ExitInstance() 5c3 )p^ ]g  
{ C1r]kF  
 VerifyWindow(); v(h   
 UnInit(); *oZBv4Vh   
 return CWinApp::ExitInstance(); _d %H;<_  
} lwQI 9U[O2  
5a5 I+* c  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 2+sNt6B2  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) &0Wv+2l @  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ H.|FEV@  
#if _MSC_VER > 1000 H5^ 'J`0\  
#pragma once J3S@1"   
#endif // _MSC_VER > 1000 2@uo2]o)  
J@p[v3W  
class CCaptureDlg : public CDialog /NMd GKr  
{ BT`D|<  
 // Construction i7mT<w>?  
 public: `<b 3e(A  
  BOOL bTray; JV(|7Sk  
  BOOL bRegistered; Ol{)U;, `  
  BOOL RegisterHotkey(); + [|2k(U  
  UCHAR cKey; pWwaN4  
  UCHAR cMask; h1FM)n[E7  
  void DeleteIcon(); &AZr (>  
  void AddIcon(); <,HdX,5  
  UINT nCount; Ia0.I " ,  
  void SaveBmp(); 7MOjZD4?  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?`,Xb.NA$K  
  // Dialog Data #N[nvIi}  
  //{{AFX_DATA(CCaptureDlg) ZK{VQ~  
  enum { IDD = IDD_CAPTURE_DIALOG }; pWO,yxr:  
  CComboBox m_Key; o*'J8El\y^  
  BOOL m_bControl; l?pZdAE  
  BOOL m_bAlt; ,DXNq`24  
  BOOL m_bShift; cqRIi~`  
  CString m_Path; &N[~+"  
  CString m_Number; 2}b1PMpZG  
  //}}AFX_DATA >m44U 9   
  // ClassWizard generated virtual function overrides [@uL)*o_#  
  //{{AFX_VIRTUAL(CCaptureDlg) tm#T8iF  
 public: NVcL9"ht*@  
  virtual BOOL PreTranslateMessage(MSG* pMsg); %fJ*Ql4M  
 protected: .Rd@,3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u"?cmg<.1  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); $X WJxQRUv  
  //}}AFX_VIRTUAL {S'xZ._=  
  // Implementation >|XQfavE  
 protected: @&83/U?  
  HICON m_hIcon; RUlM""@b  
  // Generated message map functions ncu &<j}U  
  //{{AFX_MSG(CCaptureDlg) =5[}&W  
  virtual BOOL OnInitDialog(); #'v7mEwt  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2|qE|3&{'  
  afx_msg void OnPaint(); w2@ `0  
  afx_msg HCURSOR OnQueryDragIcon(); ~{=+dQ  
  virtual void OnCancel(); FxTOc@<  
  afx_msg void OnAbout(); 5ok3q@1_]{  
  afx_msg void OnBrowse(); CsQ}eW8uEf  
  afx_msg void OnChange(); n;xtUw6 \  
 //}}AFX_MSG [NQ`S ~_:  
 DECLARE_MESSAGE_MAP() .B6$U>>NS^  
}; _^0yE_ili  
#endif 5owUQg,W  
Q/1 6D  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file M$FQoRwH  
#include "stdafx.h" OzA"i y  
#include "Capture.h" "m3u}!`3  
#include "CaptureDlg.h" Y"K7$+5#\  
#include <windowsx.h> dSS_^E[{  
#pragma comment(lib,"hook.lib") `Ft.Rwj2:m  
#ifdef _DEBUG BYqDC<Fq  
#define new DEBUG_NEW qCc'w8A  
#undef THIS_FILE 4IG'T m  
static char THIS_FILE[] = __FILE__; <DvpqlT  
#endif <q~&g &&+  
#define IDM_SHELL WM_USER+1 )67Kd]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); BBnj}XP*4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /IxMRi=  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 4["$}O5  
class CAboutDlg : public CDialog qg 4:Vq  
{ z%hB=V!~91  
 public: ;v[F@O~*)  
  CAboutDlg(); TMhUo#`I|  
  // Dialog Data E;@` { v  
  //{{AFX_DATA(CAboutDlg) wbU pD(  
  enum { IDD = IDD_ABOUTBOX }; `-hFk88  
  //}}AFX_DATA ;E,%\<  
  // ClassWizard generated virtual function overrides H/|Mq#K  
  //{{AFX_VIRTUAL(CAboutDlg) ${8 1~  
 protected: QDzFl1\P  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $f7#p4;}(  
  //}}AFX_VIRTUAL w5b D  
  // Implementation cZe,l1$  
 protected: S"!nM]2L  
  //{{AFX_MSG(CAboutDlg) #W @6@Mv  
  //}}AFX_MSG erdWGUfQOe  
  DECLARE_MESSAGE_MAP() _WVeb}  
}; Ja4O*C<  
THi*'D/  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) smoz5~  
{ N>z_uPy{A  
 //{{AFX_DATA_INIT(CAboutDlg) zRx-xWo  
 //}}AFX_DATA_INIT [@eNb^ R  
} ((SN We  
2~<?E`+  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) LR@rn2Z  
{ -|~6Zf"  
 CDialog::DoDataExchange(pDX); DDwH9*  
 //{{AFX_DATA_MAP(CAboutDlg) nBgksB*A  
 //}}AFX_DATA_MAP ?}D@{%O3T  
} )Jz L  
f[6;)ZA  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) N32!*TsWs  
 //{{AFX_MSG_MAP(CAboutDlg) ?i>.<IPOq  
 // No message handlers )|~pocXt<  
 //}}AFX_MSG_MAP ~]*P/'-{#  
END_MESSAGE_MAP() SaH0YxnY+  
x\]%TTps  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Hq?-e?Nc  
: CDialog(CCaptureDlg::IDD, pParent) :D-My28'  
{ I: P/ ?-  
 //{{AFX_DATA_INIT(CCaptureDlg) WtN o@e'  
  m_bControl = FALSE; /[#<@o  
  m_bAlt = FALSE; 7{ (t_N >  
  m_bShift = FALSE; ,P3nZ  
  m_Path = _T("c:\\"); @SF*Kvb&  
  m_Number = _T("0 picture captured."); 4yV}4f$q  
  nCount=0; ZxlQyr`~a(  
  bRegistered=FALSE; f]tc$`vb  
  bTray=FALSE; qt=gz6!  
 //}}AFX_DATA_INIT ZZL.&Ho  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 G'^Qi}o  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^w5`YI4<  
} V:4]]z L}  
th}Q`vg0  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) t|0Zpp;  
{ ^G.PdX$M  
 CDialog::DoDataExchange(pDX); 2j9Mr  
 //{{AFX_DATA_MAP(CCaptureDlg) '2vZ%C$  
  DDX_Control(pDX, IDC_KEY, m_Key); %a{$M{s  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); x6d+`4  
  DDX_Check(pDX, IDC_ALT, m_bAlt); {9q~bt  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ykrb/j|rK  
  DDX_Text(pDX, IDC_PATH, m_Path); %>_ZUu3M  
  DDX_Text(pDX, IDC_NUMBER, m_Number); .S>:-j'u  
 //}}AFX_DATA_MAP AifnC4  
} M. O3QKU4  
)mT{w9u  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) UIc )]k%  
//{{AFX_MSG_MAP(CCaptureDlg) .>%(bH8S  
 ON_WM_SYSCOMMAND() S c_#BD.  
 ON_WM_PAINT() L=nyloz,0  
 ON_WM_QUERYDRAGICON() Nih8(pbe  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 6}ct{Q  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) QCIH1\`jW  
 ON_BN_CLICKED(ID_CHANGE, OnChange) %e.tAl"!$  
//}}AFX_MSG_MAP "a %5on  
END_MESSAGE_MAP() x9)^0Hbo  
$-H#M] Gq  
BOOL CCaptureDlg::OnInitDialog() vY&[=2=  
{ |j($2.  
 CDialog::OnInitDialog(); }SIUsh'  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); h W\q  
 ASSERT(IDM_ABOUTBOX < 0xF000); @iWql*K;m  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 8x#SpDI  
 if (pSysMenu != NULL) 6,"86  
 { 3e+ Ih2  
  CString strAboutMenu; H,bYzWsrPo  
  strAboutMenu.LoadString(IDS_ABOUTBOX); } QVREj  
  if (!strAboutMenu.IsEmpty()) G9J+D?'hH  
  { Sz|;wsF{  
   pSysMenu->AppendMenu(MF_SEPARATOR); P~/Gla k  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); MA0 }BJoW  
  } o,dO.isgh>  
 } ~UA:_7#\M  
 SetIcon(m_hIcon, TRUE); // Set big icon +L D\~dcV+  
 SetIcon(m_hIcon, FALSE); // Set small icon M}2a/}4   
 m_Key.SetCurSel(0); gM~ dPM|  
 RegisterHotkey(); bBA #o\[  
 CMenu* pMenu=GetSystemMenu(FALSE); ejP273*ah  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); f-6-!  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); H/n3il_-I  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); &~Qi+b0!  
 return TRUE; // return TRUE unless you set the focus to a control 5]D"y Ay81  
} ^EY^.?Mg  
p2s*'dab7  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) N]f"+  
{ e=S51q_0  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) :!H]gC 4  
 { 3m:[o`L  
  CAboutDlg dlgAbout; }{/3yXk[G  
  dlgAbout.DoModal(); YTP6m9hA+  
 } &o@IMbJ8  
 else ?hu}wl)  
 { s @\UZ C  
  CDialog::OnSysCommand(nID, lParam); 3.,O7 k7y  
 } S?TyC";!  
} (|H1zO  
Qz6Ry\u  
void CCaptureDlg::OnPaint() qXC>D Gy  
{ &} %rZU  
 if (IsIconic()) >S/m(98  
 { ?[{_*qh  
  CPaintDC dc(this); // device context for painting >(nb8T|  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); S-@E  
  // Center icon in client rectangle >Wvb!8N  
  int cxIcon = GetSystemMetrics(SM_CXICON); 91Bl{  
  int cyIcon = GetSystemMetrics(SM_CYICON); w;f$oT  
  CRect rect; e lj]e  
  GetClientRect(&rect); hn]><kaA  
  int x = (rect.Width() - cxIcon + 1) / 2; DMO8~5  
  int y = (rect.Height() - cyIcon + 1) / 2; NbG`v@yH  
  // Draw the icon $]O;D~  
  dc.DrawIcon(x, y, m_hIcon); }&|S8:   
 } QfqosoP\D  
 else (prqo1e@  
 { :2^j/  
  CDialog::OnPaint(); 6yZ!K  
 } mhTi{t_fHM  
} .[YM0dt  
rZ}y'A   
HCURSOR CCaptureDlg::OnQueryDragIcon() (`%$Aa9J  
{ c!#DD;<Q  
 return (HCURSOR) m_hIcon; rfj>/?8!@  
} i%RN0UO^  
mFoE2?Y  
void CCaptureDlg::OnCancel() =^  
{ c~j")o  
 if(bTray) !\D[lh}rL  
  DeleteIcon(); ;oL`fQyr  
  CDialog::OnCancel(); 8bl&-F `  
} Y [8~M8QX  
.C$4jR.KC  
void CCaptureDlg::OnAbout() zg)-RCG  
{ 7ip$#pzo  
 CAboutDlg dlg; Qy!*U%tG'  
 dlg.DoModal(); q0* e1QL  
} dS9L(&  
B5FRe'UC  
void CCaptureDlg::OnBrowse() `+Ko{rf+9  
{ M3>c?,O)J  
 CString str; ~ti{na4W<  
 BROWSEINFO bi; J QSp2b@'H  
 char name[MAX_PATH]; 7&ty!PpD  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); A}K2"lQ#>,  
 bi.hwndOwner=GetSafeHwnd(); @JFfyQ {-  
 bi.pszDisplayName=name; -44{b<:D  
 bi.lpszTitle="Select folder"; !cblmF;0  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; GJ1ap^k  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); l]:nncpns  
 if(idl==NULL) 2|2'?  
  return; 0xv@l^B  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !aylrJJ  
 str.ReleaseBuffer(); ?;{ d  
 m_Path=str; %qN_<W&Ze  
 if(str.GetAt(str.GetLength()-1)!='\\') O+ ].'  
  m_Path+="\\"; Pr|:nJs  
 UpdateData(FALSE); oaxCcB=\  
} k{M4.a[(  
53vnON#{*  
void CCaptureDlg::SaveBmp() 6;|6@j  
{ "DWw]\xO](  
 CDC dc; yWsJa)e3*@  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); uU+R,P0  
 CBitmap bm; kH&KE5  
 int Width=GetSystemMetrics(SM_CXSCREEN); 8v eG^o  
 int Height=GetSystemMetrics(SM_CYSCREEN); ZjCT * qx  
 bm.CreateCompatibleBitmap(&dc,Width,Height); iA=QK u!  
 CDC tdc; I.V?O}   
 tdc.CreateCompatibleDC(&dc); k5s8s@  
 CBitmap*pOld=tdc.SelectObject(&bm); a!OS2Tz:  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); TgFj- "L\  
 tdc.SelectObject(pOld); ?ykQ]r6a<  
 BITMAP btm; wOfx7D  
 bm.GetBitmap(&btm); 6xDYEvHS  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; oRJ!J-Z]  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |s<IZ2z]}R  
 BITMAPINFOHEADER bih; soSdlV{  
 bih.biBitCount=btm.bmBitsPixel; /iz{NulOz*  
 bih.biClrImportant=0; /Mac:;W`  
 bih.biClrUsed=0; 4<P=wK=a8X  
 bih.biCompression=0; iR_j h=2{  
 bih.biHeight=btm.bmHeight; x:Mh&dq?  
 bih.biPlanes=1; -o\o{?t,  
 bih.biSize=sizeof(BITMAPINFOHEADER); '{e9Vh<x  
 bih.biSizeImage=size; pb>TUKvT&  
 bih.biWidth=btm.bmWidth; 6oh\#v3zV  
 bih.biXPelsPerMeter=0; r8]y1 Om<  
 bih.biYPelsPerMeter=0; V5]}b[X  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); j=&]=0F  
 static int filecount=0; Wc6Jgpl  
 CString name; %3"xn!'vf  
 name.Format("pict%04d.bmp",filecount++); k PuY[~i%  
 name=m_Path+name; pQ:7%+Om  
 BITMAPFILEHEADER bfh; y;'yob  
 bfh.bfReserved1=bfh.bfReserved2=0; QJeL&mf  
 bfh.bfType=((WORD)('M'<< 8)|'B'); '>8IOC  
 bfh.bfSize=54+size; _zuaImJ0o  
 bfh.bfOffBits=54; `a$c6^a  
 CFile bf; HUP~  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ p,(gv])ie  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Nft~UggK  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); G=1&:nW'  
  bf.WriteHuge(lpData,size); !c 3c%=W  
  bf.Close(); ^`BiA'gPPC  
  nCount++; -'q#u C  
 } 8ClOd<I  
 GlobalFreePtr(lpData); z' oK 0"  
 if(nCount==1) ! 06 !`LT  
  m_Number.Format("%d picture captured.",nCount); pfs'2AFj  
 else r)4GH%+?fv  
  m_Number.Format("%d pictures captured.",nCount); $oPx2sb  
  UpdateData(FALSE); //x^[fkNq)  
} eUY/H1  
{ :^;byd  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -k4w$0)  
{ R]LRgfi9  
 if(pMsg -> message == WM_KEYDOWN) 5o v F$qn  
 { s *8)|N  
  if(pMsg -> wParam == VK_ESCAPE) =sp5.-r  
   return TRUE; =hw&2c  
  if(pMsg -> wParam == VK_RETURN) #![9QUvcf  
   return TRUE; eNQQ`ll@m  
 } j=q*b Qr  
 return CDialog::PreTranslateMessage(pMsg); t\GoUeH]  
} &1!T@^56  
BXzn-S  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) H}ie D"T_  
{ x/<eY<Vgm?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ -2D/RE7|  
  SaveBmp(); GBh$nVn$  
  return FALSE; nfj8z@!  
} ls;!Og9  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <~d3L4h*<  
 CMenu pop; B IW?/^  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); y TbOBl  
 CMenu*pMenu=pop.GetSubMenu(0); KxA ^?,t[  
 pMenu->SetDefaultItem(ID_EXITICON); 5 R*  
 CPoint pt; ?Q?=I,2bP  
 GetCursorPos(&pt); oJ:\8>)9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); \ #yKCA';  
 if(id==ID_EXITICON) =x &"aF1  
  DeleteIcon(); {E 'go]  
 else if(id==ID_EXIT) hOOkf mOM  
  OnCancel(); \me'B {aa  
 return FALSE; y;GwMi $KI  
} g,k} nkIT  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); rDD,eNjG  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) tCF,KP?  
 AddIcon(); w%3*T#tp  
 return res; &E/0jxM1  
} 4qYT  
6T`F'Fk[  
void CCaptureDlg::AddIcon() ?z[k.l+6w  
{ s7789pR  
 NOTIFYICONDATA data; *XCgl*% *  
 data.cbSize=sizeof(NOTIFYICONDATA); WDF;`o*3  
 CString tip; 8kRqF?rbj  
 tip.LoadString(IDS_ICONTIP); {:%A  
 data.hIcon=GetIcon(0); #Wf9`  
 data.hWnd=GetSafeHwnd(); j%q,]HCANh  
 strcpy(data.szTip,tip); C"gH>G  
 data.uCallbackMessage=IDM_SHELL; e I^Q!b8n  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;  BH<jnQ  
 data.uID=98; =O.%)|  
 Shell_NotifyIcon(NIM_ADD,&data); +YX *.dW  
 ShowWindow(SW_HIDE); o-}q|tD$<  
 bTray=TRUE; =/Lwprj  
} xQ]^wT.Q  
#~JR_oQE!  
void CCaptureDlg::DeleteIcon() <@](uWu  
{ \F;  S  
 NOTIFYICONDATA data; 5bZjW~d  
 data.cbSize=sizeof(NOTIFYICONDATA); e,X {.NS  
 data.hWnd=GetSafeHwnd(); yu.N>[=  
 data.uID=98; ~%D=\iE  
 Shell_NotifyIcon(NIM_DELETE,&data); Cqra\  
 ShowWindow(SW_SHOW); @p\te7(P%  
 SetForegroundWindow(); 5*#3v:l/9  
 ShowWindow(SW_SHOWNORMAL); + lNAog  
 bTray=FALSE; "J=A(w5   
} -Uo"!o>x|  
wvnuE<o8  
void CCaptureDlg::OnChange() NDo>"in  
{ FSNzBN  
 RegisterHotkey(); >hFg,5 _l3  
} .wPu #*  
k@Q>(`  
BOOL CCaptureDlg::RegisterHotkey() %"gV>E_u  
{ C4h4W3w  
 UpdateData(); T1_qAz+  
 UCHAR mask=0; ssUm1F\  
 UCHAR key=0; \Um &  
 if(m_bControl) O={ ?c1i:  
  mask|=4; nuucYm%IF-  
 if(m_bAlt) 'VQ mK#  
  mask|=2; 0{k*SCN#  
 if(m_bShift) 4f-I,)qCBk  
  mask|=1; bkSI1m3  
  key=Key_Table[m_Key.GetCurSel()]; W*!u_]K>  
 if(bRegistered){ !C>'a:  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); >&-" X# :  
  bRegistered=FALSE; }|-Yd"$  
 } h4,S /n  
 cMask=mask; CY?19Ak-xd  
 cKey=key; :&-j{8p-  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); p(6!7t:  
 return bRegistered; An2Wj  
} 6?uo6 I  
lD]/Kx  
  四、小结 <], ~V\m  
bmd3fJb`r  
  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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