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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: %wc=Mf  
  ]jkaOj  
  一、实现方法 ,j'>}'wG)  
N1pw*<&  
  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: 88]UA  
Zn-F!Lsv  
#pragma data_seg("shareddata") cTq}H_hC  
HHOOK hHook =NULL; //钩子句柄 Zy<gA >  
UINT nHookCount =0; //挂接的程序数目 s={jwI50  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 @@])B#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 BB>R=kt  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey !_ng_,J  
static int KeyCount =0; YNRorE   
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 <8'-azpJ6<  
#pragma data_seg() M^e;WY@ D  
9q4%s?)j  
  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。 QoU0>p+ 2  
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  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: 9"jhS0M  
o'`:$ (  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ipIexv1/S  
cKey,UCHAR cMask) 8}Qmhm`_j=  
{ IpRdGT02  
 BOOL bAdded=FALSE; ]P5|V4FXo  
 for(int index=0;index<MAX_KEY;index++){ NDmTxW#g  
  if(hCallWnd[index]==0){ t/3t69\x  
   hCallWnd[index]=hWnd; 5y1:oiE/  
   HotKey[index]=cKey; tbNIl cAWS  
   HotKeyMask[index]=cMask; RTEzcJ>  
   bAdded=TRUE; NJe^5>4`  
   KeyCount++; }H>}v/  
   break; h VQj$TA  
  } Jxq;Uu9  
 } sXpA^pT"T  
 return bAdded; 7M#irCX  
} $v6`5;#u  
//删除热键 `!JcQ'u  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #cZ<[K q6  
{ [5iBXOmpS=  
 BOOL bRemoved=FALSE;  /uyZ[=5  
 for(int index=0;index<MAX_KEY;index++){ 2brxV'tk  
  if(hCallWnd[index]==hWnd){ 5d4/}o}%"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {FrcpcrQa  
    hCallWnd[index]=NULL; :'F7^N3;H  
    HotKey[index]=0; $4&%<'l3I  
    HotKeyMask[index]=0; V"r2 t9A  
    bRemoved=TRUE;   OH*  
    KeyCount--; zS6oz=  
    break; HZ+l){u  
   } Kb/w+J S  
  } Pr!H>dH8o  
 } j~ 'a %P  
 return bRemoved; qkg`4'rLg  
} m7F"kD  
,f]GOH  
Y >83G`*}b  
  DLL中的钩子函数如下: Zdm7As]  
lV*dQwa?i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }3Mnq?.-  
{ l?UFe$9(  
 BOOL bProcessed=FALSE; 5g-AB`6T  
 if(HC_ACTION==nCode) A%zX LV=3O  
 { wS)2ymRg  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 3G;#QK -c  
   switch(wParam) 3T|xUY)G4  
   {  $YNWT\FE  
    case VK_MENU: Fr,qVYf  
     MaskBits&=~ALTBIT; RTJ\|#w  
     break; t.ci!#/d  
    case VK_CONTROL: !qQ B}sAf  
     MaskBits&=~CTRLBIT; &.ilku/  
     break; V=?qU&r<+  
    case VK_SHIFT: k v>rv37u  
     MaskBits&=~SHIFTBIT; lDV}vuM<4  
     break; {?zBc E:  
    default: //judge the key and send message 5xsGSoa+  
     break; Kz>Bw;R(  
   } EV$$wrohQ`  
   for(int index=0;index<MAX_KEY;index++){ /ZeN\ybx  
    if(hCallWnd[index]==NULL) j -R9=vB2  
     continue; =u.jZ*u]WT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \a .^5g  
    { [PI!.9H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /4!.G#DLQ  
     bProcessed=TRUE; Si:$zGL$(  
    } [\rnJ lE  
   } =Ay'\j  
  } ]8c%)%Vi  
  else if((lParam&0xc000ffff)==1){ //有键按下 JSAbh\Mq6  
   switch(wParam) hbOyrjan x  
   { gpe/dfyJ9  
    case VK_MENU: L2jjkyX]  
     MaskBits|=ALTBIT; )yj:P  
     break; fGz++;b<S  
    case VK_CONTROL: :9O"?FE  
     MaskBits|=CTRLBIT; `/4 R$E{  
     break; DA(ur'D  
    case VK_SHIFT: dYn<L/#  
     MaskBits|=SHIFTBIT; *wd@YMOP  
     break; xaSg'8-  
    default: //judge the key and send message .Z0$KQ'iy  
     break; a*g7uaoP  
   } T0Kjnzs  
   for(int index=0;index<MAX_KEY;index++){ e-`=?tct  
    if(hCallWnd[index]==NULL) r) SG!;X  
     continue; 8F;f&&L"y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B9[eLh!  
    { dHUcu@,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %^?yI  
     bProcessed=TRUE; u |EECjJn  
    } a(a 2xa  
   } %!vgAH4  
  } Cr  a@  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 w~n7l97Pw  
   for(int index=0;index<MAX_KEY;index++){ "7. lsL5  
    if(hCallWnd[index]==NULL) z5k9|.hgw  
     continue; iem@ K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 0]._|Ubn6)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9eh9@~mU"l  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ?cH,!2  
   } t'.oty=  
  } WYayr1  
 } L4x08 e  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3SMb#ce*o  
} c'XvZNf .C  
@'ln)RT,  
  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: T]fBVA  
Shm$>\~=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "+@>!U  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [Up0<`Q{I_  
Z6F^p8O-  
  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: D rMG{Yiu  
.R<Ke\y/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) R'Y=- yF  
{ 2GB+st,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ]-D&/88``  
 { 5YW.s   
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ]%4rL S  
  SaveBmp(); @TWtM#  
  return FALSE; +kXj+2  
 } CL%+`c0  
 …… //其它处理及默认处理 jr=>L:  
} (oiF05n h  
OSDx  
>,#7 3u#  
  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。 ,];4+&|8kW  
Naqz":%.  
  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。 IdzrQP  
<.N33 7!  
  二、编程步骤 &M5_G$5n  
eKT'd#o2R  
  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"; MUeS8:q-N  
 -l ?J  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; =D"H0w <zw  
6 pQbh*  
  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; 2o\GU  
}z/Y Hv%  
  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;  mDJg-BQ  
|9D;2N(&!  
  5、 添加代码,编译运行程序。 <jnra4>  
rK@UCRf  
三、程序代码 2 ~zo)G0  
gEBwn2  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Bv)4YU  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) w2mLL?P  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 7H=^~J  
#if _MSC_VER > 1000 FX6 *`  
#pragma once =q4 QBAW  
#endif // _MSC_VER > 1000 R[/]iK+!&  
#ifndef __AFXWIN_H__ <r1N6(n  
#error include 'stdafx.h' before including this file for PCH R'.YE;leBG  
#endif jxt^d  
#include "resource.h" // main symbols VHUOI64*  
class CHookApp : public CWinApp 2|8&=K /  
{ U_/<tWl\[3  
 public: sXmZ0Dv  
  CHookApp(); "?yu^  
  // Overrides j$f`:A  
  // ClassWizard generated virtual function overrides @uWPo2  
  //{{AFX_VIRTUAL(CHookApp) oV 7A"8L^a  
 public: [)ybPIv]  
  virtual BOOL InitInstance(); 02EbmP  
  virtual int ExitInstance(); -A\J:2a|  
  //}}AFX_VIRTUAL u\]aUP e  
  //{{AFX_MSG(CHookApp) ,XZ[L? >  
  // NOTE - the ClassWizard will add and remove member functions here. BUozpqN}  
  // DO NOT EDIT what you see in these blocks of generated code ! fV` R7m.  
  //}}AFX_MSG f7Dx.-  
  DECLARE_MESSAGE_MAP() q%/ciPgE  
}; g3i !>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); luEP5l2&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1 ^k#g,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;h }^f-  
BOOL InitHotkey(); dF- d  
BOOL UnInit(); R^i8AbFW  
#endif 6-'Y*  
g@ ZZcBx  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 'x-PQQ  
#include "stdafx.h" 1HBdIWhHv.  
#include "hook.h" xzGs%01]  
#include <windowsx.h> @+S5"W  
#ifdef _DEBUG |0wUOs*5  
#define new DEBUG_NEW l*l(QvN_  
#undef THIS_FILE [P*w$Hn  
static char THIS_FILE[] = __FILE__; h2Pvj37  
#endif Ef}rMkv  
#define MAX_KEY 100 rdL>yT/A  
#define CTRLBIT 0x04 `B^ HW8  
#define ALTBIT 0x02 Ux2p qPb  
#define SHIFTBIT 0x01 gda3{g7<)  
#pragma data_seg("shareddata") u/@dWeY[]  
HHOOK hHook =NULL; aXSTA ,%  
UINT nHookCount =0; wN])"bmB  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Z~.3)6,z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 05<MsxB"w  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey u.}z}'-  
static int KeyCount =0; ^PCshb##  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift D:uBr|('  
#pragma data_seg() _a"\g9{%*  
HINSTANCE hins; p^LUyLG`  
void VerifyWindow(); XOM@Pi#z  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) n{~W s^d  
//{{AFX_MSG_MAP(CHookApp) Y^?J3[@  
// NOTE - the ClassWizard will add and remove mapping macros here. }tIIA"dZ  
// DO NOT EDIT what you see in these blocks of generated code! tXocGM {6C  
//}}AFX_MSG_MAP GUe&WW:Sqk  
END_MESSAGE_MAP() .&53WL[D|  
,UdTUw~F  
CHookApp::CHookApp() ijYSYX@  
{ 27;t,Oq}  
 // TODO: add construction code here, UeVRd  
 // Place all significant initialization in InitInstance P2nb&lVdu  
} !2('Cq_^  
*lN>RWbM%  
CHookApp theApp; &k5 Z|d|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >^@/Ba$h  
{ XK)qDg  
 BOOL bProcessed=FALSE; _Z:WgO].  
 if(HC_ACTION==nCode) hr8v O"tZN  
 { r9/PmZo4x  
  if((lParam&0xc0000000)==0xc0000000){// Key up +yq Z\$ii  
   switch(wParam) /&>6#3df-  
   { Um k9  
    case VK_MENU: BO b#9r  
     MaskBits&=~ALTBIT; Ny;(1N|&3  
     break; &b 2Vt  
    case VK_CONTROL: (~r"N?`  
     MaskBits&=~CTRLBIT; %} _{_Z  
     break; o0>z6Ya<  
    case VK_SHIFT: uC>X;<^   
     MaskBits&=~SHIFTBIT; 5]WpH0kzO  
     break; * Yr)>;^  
    default: //judge the key and send message g`jO  
     break; i0($@6Lh  
   } Z[baQO  
   for(int index=0;index<MAX_KEY;index++){ )w8h2=l  
    if(hCallWnd[index]==NULL) ,H3~mq]  
     continue; xj/ +Z!,9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nQc]f*  
    { m~fA=#l l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7P`|wNq  
     bProcessed=TRUE; K h}Oiw  
    } b7It8  
   } Y5~_y?BX  
  } n lsQf3  
  else if((lParam&0xc000ffff)==1){ //Key down '3f"#fF6  
   switch(wParam) ]@W.5!5H  
   { Uk u~"OGC  
    case VK_MENU: ?qviJDD|f  
     MaskBits|=ALTBIT; `e t0i.  
     break; P9/5M4]tt  
    case VK_CONTROL: /q4<ZS#  
     MaskBits|=CTRLBIT; z?HP%g'M~  
     break; D>u1ngu  
    case VK_SHIFT: *dn~-W.  
     MaskBits|=SHIFTBIT; \N\Jny  
     break; ]q0mo1-EZ!  
    default: //judge the key and send message 'H<0:bQ=I  
     break; D7b<&D@  
   } \v7M`! &  
   for(int index=0;index<MAX_KEY;index++) 6@-VLO))O  
   { Kr!(<i  
    if(hCallWnd[index]==NULL) 0xVue[ep  
     continue; s[ |sfqB1`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1&~u:RUXe  
    { x8Rmap@L.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Kb~s'cTxIO  
     bProcessed=TRUE; m}] bP  
    } @Y'BqDFlZ  
   } LL+ROX^M  
  } >A#wvQl7   
  if(!bProcessed){ u/e-m/  
   for(int index=0;index<MAX_KEY;index++){ nz:I\yA  
    if(hCallWnd[index]==NULL) `<Xq@\H  
     continue; #`5{?2gS9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Ey$J.qw3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); j4L ) D  
   } n$Z@7r  
  } #pbPaRJL(  
 } U+t|wK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Gxu&o%x [  
} dUOvv/,FZT  
bv`gjR  
BOOL InitHotkey() jN:!V t  
{ yjODa90!G  
 if(hHook!=NULL){ 7@u0;5p|  
  nHookCount++; *ktM<N58  
  return TRUE; |?n=~21"1O  
 } utxT$1iJn~  
 else  $9dm2#0d  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); )cnB>Qul  
  if(hHook!=NULL) XJ~_FiB  
   nHookCount++; `y; s1nL  
  return (hHook!=NULL);  H  
} 5n,?>> p$  
BOOL UnInit() E.]sX_X?  
{ 7pDov@K<{  
 if(nHookCount>1){ 6R V]9  
  nHookCount--; ^GG6%=g'  
  return TRUE; [pOQpfo\  
 } m5lMh14E  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 7u]0dHj  
 if(unhooked==TRUE){ t>QAM6[  
  nHookCount=0; aJlSIw*Q,  
  hHook=NULL; Be+CV">2  
 } zXQ o pQ1  
 return unhooked; ">]v'h(s  
} V`$Jan  
<>`+" O}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) OJ ng  
{ sZ #Ck"n  
 BOOL bAdded=FALSE; *joy%F  
 for(int index=0;index<MAX_KEY;index++){ uBI?nv,  
  if(hCallWnd[index]==0){ w*`5b!+/  
   hCallWnd[index]=hWnd; il `O*6-  
   HotKey[index]=cKey; XQ&iV7   
   HotKeyMask[index]=cMask; %pmowo~{  
   bAdded=TRUE; Ym+k \h  
   KeyCount++; m RB-}  
   break; ^'Wkb7L  
  } n<6p0w  
 } 1J<Wth{  
 return bAdded; A6Ttx{]  
} v]|^.x:  
9E^IEwq'  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `f`\j -Lu  
{ `An`"$z  
 BOOL bRemoved=FALSE; 8FyJo.vr(  
 for(int index=0;index<MAX_KEY;index++){ %m]9";   
  if(hCallWnd[index]==hWnd){ {"l_x]q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Z.+-MNWV  
    hCallWnd[index]=NULL; <d~P;R(@  
    HotKey[index]=0; 8MgoAX,p  
    HotKeyMask[index]=0; +HNY!fv9  
    bRemoved=TRUE; XYIZ^_My  
    KeyCount--; [8AGW7_  
    break; |i'V\" hW  
   } p_S8m|%  
  } MVU5+wX  
 } ]5W0zNb*  
 return bRemoved; =vLeOX  
} PV vNu5k  
'"LrGvkZ  
void VerifyWindow() bFk >IifN  
{ g#qt<d}j  
 for(int i=0;i<MAX_KEY;i++){ iLw O4i  
  if(hCallWnd!=NULL){ wvsKn YKX  
   if(!IsWindow(hCallWnd)){ Ub=g<MYHV  
    hCallWnd=NULL; Cw]& B  
    HotKey=0; %7 h _D  
    HotKeyMask=0; ez_qG=J .  
    KeyCount--; 'F3Xb  
   } r=6-kC!T9  
  } 62K7afH  
 } TB 9{e!4  
} ,-^Grmr4M  
O_aZ\28};C  
BOOL CHookApp::InitInstance() kx8\]'  
{ }yZ9pTB.?E  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;Ut0tm  
 hins=AfxGetInstanceHandle(); <RY5ZP  
 InitHotkey(); p Ux ~  
 return CWinApp::InitInstance(); ocBfs^ aW  
} MIvAugUOl  
,R/HT@  
int CHookApp::ExitInstance() 4d3]L` f  
{ nsFOtOdd  
 VerifyWindow(); 0FmYM@Wc  
 UnInit(); 3Z#k9c_b  
 return CWinApp::ExitInstance(); 9 lE[oAC  
} lR[[]Yn  
"mc/fp  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ($EA/|z  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) t98t&YUpm  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ s*{l}~fPkW  
#if _MSC_VER > 1000 Pn|A>.)z  
#pragma once i-[ic!RnKj  
#endif // _MSC_VER > 1000 >2l1t}"\  
uu L"o  
class CCaptureDlg : public CDialog c'nEbelE  
{ /tI8JXcUK  
 // Construction O@r%G0Jge  
 public: UN#XP$utY  
  BOOL bTray; .g71?^?(  
  BOOL bRegistered; lPyGL-Q  
  BOOL RegisterHotkey(); .&dW?HS  
  UCHAR cKey; oLK-~[p  
  UCHAR cMask;  (`PgvBL:  
  void DeleteIcon(); )8]O|Z-CU  
  void AddIcon(); ]vRte!QJ;  
  UINT nCount; d2sY.L  
  void SaveBmp(); JVbR5"+.  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor `>&V_^y+  
  // Dialog Data +-YMW;5  
  //{{AFX_DATA(CCaptureDlg) 7/QQ&7+NkS  
  enum { IDD = IDD_CAPTURE_DIALOG }; !_CBf#0  
  CComboBox m_Key; 3Ob"R%Yo  
  BOOL m_bControl; N>##} i  
  BOOL m_bAlt; 9}^nozR,I  
  BOOL m_bShift; y}5V3)P  
  CString m_Path; |}s)Wo  
  CString m_Number; eMyh&@7(F  
  //}}AFX_DATA Vm}OrFA  
  // ClassWizard generated virtual function overrides a@:(L"Or  
  //{{AFX_VIRTUAL(CCaptureDlg) :VpRpj4f  
 public: o1<Y#db[  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ("-Co,4ey  
 protected: "F?p\I)(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support BM5+;h !  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ]OIB;h;3  
  //}}AFX_VIRTUAL "8}p>gS  
  // Implementation :YaEMQJ^  
 protected: .CGPG,\2  
  HICON m_hIcon; G"P@AOw  
  // Generated message map functions ggQ/_F8u  
  //{{AFX_MSG(CCaptureDlg) Vg'vL[Y  
  virtual BOOL OnInitDialog(); u6^cLQO+  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); jp=z ^l  
  afx_msg void OnPaint(); F]]1>w*/0  
  afx_msg HCURSOR OnQueryDragIcon(); xUl=N   
  virtual void OnCancel(); ?WPuTPw{  
  afx_msg void OnAbout(); EH{m~x[Ei  
  afx_msg void OnBrowse(); ~L\KMB/9e=  
  afx_msg void OnChange(); #M kXio; h  
 //}}AFX_MSG -X+G_rY  
 DECLARE_MESSAGE_MAP() qv\n]M_&  
}; Er/h:=  
#endif B].V|8h  
kN(*.Q|VZ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file o2M+=O@  
#include "stdafx.h" ~ 8L]!OQ9=  
#include "Capture.h" w#|uR^~  
#include "CaptureDlg.h" (jb9Uk_t  
#include <windowsx.h> @@~OA>^  
#pragma comment(lib,"hook.lib") j}9][Fm1*  
#ifdef _DEBUG ;e,_F/@`  
#define new DEBUG_NEW =rSJ6'2("  
#undef THIS_FILE 8~*<s5H  
static char THIS_FILE[] = __FILE__; x!5b" "  
#endif ; kPx@C   
#define IDM_SHELL WM_USER+1 SOE 5`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5cj]Y)I-~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Jw13 Wb-  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [Q"*I2&  
class CAboutDlg : public CDialog 4 mj\wBp  
{ A^lJlr:_`  
 public: c;siMWw;  
  CAboutDlg(); &b :u~puM  
  // Dialog Data JX4uH>6  
  //{{AFX_DATA(CAboutDlg) <ZmC8&Uo  
  enum { IDD = IDD_ABOUTBOX }; dy/\>hu  
  //}}AFX_DATA 5cahbx1"  
  // ClassWizard generated virtual function overrides r'bctFsD  
  //{{AFX_VIRTUAL(CAboutDlg) sBUK v(U)  
 protected: \"=4)Huv  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dCq-&3?t  
  //}}AFX_VIRTUAL oDz%K?29%  
  // Implementation K"Vo'9R[_  
 protected: !O|d,)$q  
  //{{AFX_MSG(CAboutDlg) WcRTv"4&  
  //}}AFX_MSG h8 Wv t's  
  DECLARE_MESSAGE_MAP() ^a+W!  
}; MnToL@  
F)fCj^ zL  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) _:dt8+T#  
{ =QdHji/sB  
 //{{AFX_DATA_INIT(CAboutDlg) RRSkXDU}  
 //}}AFX_DATA_INIT W5 l)mAv  
} iczJXA+  
vNdMPulr{  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) <'(O0  
{ ~x67v+I  
 CDialog::DoDataExchange(pDX); 2;8I0BH*'  
 //{{AFX_DATA_MAP(CAboutDlg) [l~Gwaul>  
 //}}AFX_DATA_MAP ;MSdTHN"  
} 7 2Zp%a=  
VtM:~|v  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) )|52B;yZx  
 //{{AFX_MSG_MAP(CAboutDlg) X8(H#Ef[  
 // No message handlers aTi2=HL=S  
 //}}AFX_MSG_MAP ,orq&#*Wd  
END_MESSAGE_MAP() kT7x !7C  
<HYK9{Q  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) LYTx8  
: CDialog(CCaptureDlg::IDD, pParent) SNLZU%jan  
{ sd(Yr6~..  
 //{{AFX_DATA_INIT(CCaptureDlg) Z]L_{=*  
  m_bControl = FALSE; C1V:_-  
  m_bAlt = FALSE; (i3V  
  m_bShift = FALSE; ]IF QD  
  m_Path = _T("c:\\"); R\i8O^[  
  m_Number = _T("0 picture captured."); s,z$Vt"h*K  
  nCount=0; KImBQ2^Tu  
  bRegistered=FALSE; K!AW8FnHkZ  
  bTray=FALSE; XSfl'Fll D  
 //}}AFX_DATA_INIT zY11.!2  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ~Qg:_ @@\  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); |ZJ<J)y  
} /-C`*P=:u  
RC[mpR ;2  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <[*%d~92z  
{ <n#phU Q  
 CDialog::DoDataExchange(pDX); ;JpsRf!  
 //{{AFX_DATA_MAP(CCaptureDlg) >JSk/]"  
  DDX_Control(pDX, IDC_KEY, m_Key); NY(z 3G  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5Q/&,NP  
  DDX_Check(pDX, IDC_ALT, m_bAlt); !UzMuGj  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 8%+F.r  
  DDX_Text(pDX, IDC_PATH, m_Path); 3bWYRW  
  DDX_Text(pDX, IDC_NUMBER, m_Number); B|fh 4FNy  
 //}}AFX_DATA_MAP v d{`*|x  
} ;FQ<4PR$  
k 4HE'WY  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) S*aMUV&  
//{{AFX_MSG_MAP(CCaptureDlg) \r.{Ru  
 ON_WM_SYSCOMMAND() 0fOx&"UAB  
 ON_WM_PAINT() DfPC@` k  
 ON_WM_QUERYDRAGICON() ?cyBF*o  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) b-/8R|Mem  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) |qOoL*z  
 ON_BN_CLICKED(ID_CHANGE, OnChange) E*B6k!:  
//}}AFX_MSG_MAP y3Z\ Y[  
END_MESSAGE_MAP() -(oFO'Lbg  
bU3P; a(  
BOOL CCaptureDlg::OnInitDialog() {4C/ZA{|l  
{ wI0NotC  
 CDialog::OnInitDialog(); "r+v^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); R5"5Z?'  
 ASSERT(IDM_ABOUTBOX < 0xF000); a+-X\qN  
 CMenu* pSysMenu = GetSystemMenu(FALSE); c }-AD r9  
 if (pSysMenu != NULL) 5%6{ ePh{  
 { V/t/uNm  
  CString strAboutMenu; y^u9Ttf{  
  strAboutMenu.LoadString(IDS_ABOUTBOX); `] fud{  
  if (!strAboutMenu.IsEmpty()) e> zv+9'Q  
  { eb ` !  
   pSysMenu->AppendMenu(MF_SEPARATOR); Rfx}[!<{N  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); c>$PLO^  
  } n%Rl$  
 } $~;h}I  
 SetIcon(m_hIcon, TRUE); // Set big icon -J6G=+ s/  
 SetIcon(m_hIcon, FALSE); // Set small icon K|Cb6''  
 m_Key.SetCurSel(0); `SfBT1#5G  
 RegisterHotkey(); ;h"St0   
 CMenu* pMenu=GetSystemMenu(FALSE); B=<Z@u  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); hf`5NcnP  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); VG=mA4Dd  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5 LX'fL7zU  
 return TRUE; // return TRUE unless you set the focus to a control #^>Md59N  
} 15l{gbCW  
IG(1h+5 R(  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) pzcl@  
{ o5(~nQ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) i"_@iN0N  
 { \@8.BCWK  
  CAboutDlg dlgAbout; m) q e  
  dlgAbout.DoModal(); zbL8 pp  
 } `w(~[`F t  
 else H6oU Ne  
 { 0K<|>I  
  CDialog::OnSysCommand(nID, lParam); Cu $mb}@  
 } f(*ygI  
} 2?}5U)Hg  
\RF{ITV$kD  
void CCaptureDlg::OnPaint() xb (Cd  
{ ;1MRBk,  
 if (IsIconic()) |19zjhl  
 { C f(g  
  CPaintDC dc(this); // device context for painting dI%#cf1  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); S|Yz5)*  
  // Center icon in client rectangle q}+Fm?B   
  int cxIcon = GetSystemMetrics(SM_CXICON); =jWjUkm2  
  int cyIcon = GetSystemMetrics(SM_CYICON); 0|chRX  
  CRect rect; }od5kK;  
  GetClientRect(&rect); ' X9D(?O  
  int x = (rect.Width() - cxIcon + 1) / 2; $&ZN%o3  
  int y = (rect.Height() - cyIcon + 1) / 2; x-@}x@n&[  
  // Draw the icon bm\Zp  
  dc.DrawIcon(x, y, m_hIcon); DX b=Ku  
 } +M{A4nYY|1  
 else Uaz$<K6  
 { \:5M0  
  CDialog::OnPaint(); =U`9_]~1c@  
 } O/ ih9,  
} U{Xx)l/o  
YVW`|'7)|  
HCURSOR CCaptureDlg::OnQueryDragIcon() y?-zQs0  
{ .QLjaEja  
 return (HCURSOR) m_hIcon; KmX?W/%R  
} xsERnF>`  
) OE!vA  
void CCaptureDlg::OnCancel() r^ Mu`*x*  
{ Ls2g#+  
 if(bTray) JU`5K}H<  
  DeleteIcon(); zqlgJn  
  CDialog::OnCancel(); zf.&E3Sn  
} + d289"  
,&ld:v?~  
void CCaptureDlg::OnAbout() rk)h_zN  
{ -VafN   
 CAboutDlg dlg; +\s&v!  
 dlg.DoModal(); Mrly(*!U"@  
} sIz*r Gz  
:YUQKy  
void CCaptureDlg::OnBrowse() GS qt:<Qs  
{ V+>.Gf  
 CString str; pRc<U^Z.h  
 BROWSEINFO bi; =%ry-n G  
 char name[MAX_PATH]; P+gY LX8  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); P>wTp)  
 bi.hwndOwner=GetSafeHwnd(); *V[6ta'  
 bi.pszDisplayName=name; vD91t/_+  
 bi.lpszTitle="Select folder"; Z~Vups#+f  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 8-geBlCE,  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); \wb0%> 0  
 if(idl==NULL) e .(  
  return; iji2gWV}h  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); H6 V!W\:s  
 str.ReleaseBuffer(); AD@-H0Y  
 m_Path=str; u?V Tnsu  
 if(str.GetAt(str.GetLength()-1)!='\\') \eoJ6IRE\T  
  m_Path+="\\"; +sm9H"_0  
 UpdateData(FALSE); @q++eGm\Q  
} c W^  
_@A%t&l  
void CCaptureDlg::SaveBmp() c 0.? d]  
{ sA:k8aj  
 CDC dc; Z_WJgH2c  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); XM:Y(#?l  
 CBitmap bm; qGhwbg  
 int Width=GetSystemMetrics(SM_CXSCREEN); ]s>y se  
 int Height=GetSystemMetrics(SM_CYSCREEN); K0-AP $  
 bm.CreateCompatibleBitmap(&dc,Width,Height); w#w?Y!JXo  
 CDC tdc; ){FXonVP  
 tdc.CreateCompatibleDC(&dc); u0i;vO)MNt  
 CBitmap*pOld=tdc.SelectObject(&bm); w<$0n#5  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); v?<Tkw ^F  
 tdc.SelectObject(pOld); X{-901J1  
 BITMAP btm; R7NE= X4  
 bm.GetBitmap(&btm);  .H7xG'$  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; F&)(G\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ~7O.}RP0  
 BITMAPINFOHEADER bih; g"|/^G_6S  
 bih.biBitCount=btm.bmBitsPixel; 4) z*Vux  
 bih.biClrImportant=0; 5169E*  
 bih.biClrUsed=0; =q"o%dc`R  
 bih.biCompression=0; _d*QA{  
 bih.biHeight=btm.bmHeight; jrLV\(p  
 bih.biPlanes=1; ^#p+#_*V  
 bih.biSize=sizeof(BITMAPINFOHEADER); K<~J*k<v  
 bih.biSizeImage=size; ^/:G`'  
 bih.biWidth=btm.bmWidth; 4fgYO]  
 bih.biXPelsPerMeter=0; %=<Kb\  
 bih.biYPelsPerMeter=0; 5"^Z7+6  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); z8*{i]j  
 static int filecount=0; 4u+4LB*  
 CString name; D\ kd6  
 name.Format("pict%04d.bmp",filecount++); 2y#[uSqB  
 name=m_Path+name; M0Vs9K=  
 BITMAPFILEHEADER bfh; Ns5'K^  
 bfh.bfReserved1=bfh.bfReserved2=0; S E0&CV4  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ]h 4r@L3  
 bfh.bfSize=54+size; =b/:rSd$NA  
 bfh.bfOffBits=54; y25L`b  
 CFile bf; -;W`0 k^  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ {/Qg4pc!  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Rpou.RrXR7  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8%#pv}  
  bf.WriteHuge(lpData,size); ]>H'CM4JR  
  bf.Close(); [*W l=  
  nCount++; )Nkf'&  
 } /4 %ycr6  
 GlobalFreePtr(lpData); @zq]vX-A_  
 if(nCount==1) 2NvbQ 3c5  
  m_Number.Format("%d picture captured.",nCount); W*.6'u)9  
 else s%Irh;Bs  
  m_Number.Format("%d pictures captured.",nCount); 344E4F"ph  
  UpdateData(FALSE); ~pG,|\9  
} o@@, }  
qJ%AbdOI8  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ?r/)s()ALf  
{ U%H6jVE  
 if(pMsg -> message == WM_KEYDOWN) <)9dTOdd  
 { (^9dp[2  
  if(pMsg -> wParam == VK_ESCAPE) 2x<4&^  
   return TRUE; 0o_wy1O1,  
  if(pMsg -> wParam == VK_RETURN) -_+,HyJP  
   return TRUE; O]%Vh l  
 } q&d5V~q  
 return CDialog::PreTranslateMessage(pMsg); R~!md  
} |]+PDc%  
^J?y mo$>0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [a!*m<  
{ z!>ml3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Rr"D)|Y;C(  
  SaveBmp(); *z6m644H  
  return FALSE; 1vUW$)?X  
} =+"=|cQ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ )9s 6(Iu  
 CMenu pop; {/}p"(^  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ~LSD\+  
 CMenu*pMenu=pop.GetSubMenu(0); iiD }2y b  
 pMenu->SetDefaultItem(ID_EXITICON); ZxU3)`O  
 CPoint pt; XI7:y4M  
 GetCursorPos(&pt); N)Qz:o0W  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +p):   
 if(id==ID_EXITICON) <EM'|IR?  
  DeleteIcon(); 2{I+H'w8:  
 else if(id==ID_EXIT) }KFM8CbS  
  OnCancel(); g ^4<ve  
 return FALSE; +xn59V  
} >NjgLJh  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 3w$Ib}7   
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 5KRI}f  
 AddIcon(); H`EsFKw\%  
 return res; hYY-Eq4TC  
} U8GvUysB!  
!7y:|k,ac  
void CCaptureDlg::AddIcon() k\A[p\  
{ M$MFUGS'  
 NOTIFYICONDATA data; &hSF  
 data.cbSize=sizeof(NOTIFYICONDATA); FC }r~syqA  
 CString tip; RC+`sZ E9  
 tip.LoadString(IDS_ICONTIP); (U^f0wJg  
 data.hIcon=GetIcon(0); J8#3?Lp  
 data.hWnd=GetSafeHwnd(); *7G5\[gI$  
 strcpy(data.szTip,tip); WYY&MHp  
 data.uCallbackMessage=IDM_SHELL; [$FiXH J  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 4">C0m;ks  
 data.uID=98; z,IUCNgM  
 Shell_NotifyIcon(NIM_ADD,&data); H:!pFj  
 ShowWindow(SW_HIDE); 4$MV]ldUI  
 bTray=TRUE; ,@r 0-gL  
} 'q, L*  
.y^T 3?}I  
void CCaptureDlg::DeleteIcon() 9KDm<Q-mf  
{ ;k5B@z/<S  
 NOTIFYICONDATA data; %hV]vm  
 data.cbSize=sizeof(NOTIFYICONDATA); YJMaIFt  
 data.hWnd=GetSafeHwnd(); R(W}..U0R"  
 data.uID=98; -,^Z5N#\|  
 Shell_NotifyIcon(NIM_DELETE,&data); $@@@</VbP  
 ShowWindow(SW_SHOW); -cL wjI  
 SetForegroundWindow(); L2{b~`UvP  
 ShowWindow(SW_SHOWNORMAL); <g'0q*qE  
 bTray=FALSE; x{I, gu|+  
} ZZJ<JdD  
.kZ<Q]Vk  
void CCaptureDlg::OnChange() -PLh|  
{ MHF7hk ps}  
 RegisterHotkey(); r l>e~i  
} RE.t<VasP  
C[Nh>V7=  
BOOL CCaptureDlg::RegisterHotkey() \3 M%vJ  
{ /{ FSG!  
 UpdateData(); 35Cm>X  
 UCHAR mask=0; Be~In~~  
 UCHAR key=0; 3"p'WZ>  
 if(m_bControl) ]=?.LMjnH  
  mask|=4; ^Q5advxuq  
 if(m_bAlt) 8 GW0w  
  mask|=2; #55_hY#  
 if(m_bShift) hL}AgY@  
  mask|=1; NZ:KJ8ea"  
  key=Key_Table[m_Key.GetCurSel()]; iNv"!'|  
 if(bRegistered){ U]64HuL  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); %WAaoR&u  
  bRegistered=FALSE; W:V.\  
 } rhj_cw  
 cMask=mask; N%fDgK  
 cKey=key; 9/$Cq  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); l }WvO]  
 return bRegistered; !]2`dp\!  
} 9Z lfY1=  
$3yn-'o'A  
  四、小结 GyLp&aa  
0q_?<v_ 1  
  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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