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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: {Bu^%JEn  
  e\\ I,  
  一、实现方法 /H}83 C  
?:UDK?  
  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: T@X!vCjf6  
."9v1kW  
#pragma data_seg("shareddata") SV-pS>#  
HHOOK hHook =NULL; //钩子句柄 *r[PZ{D+  
UINT nHookCount =0; //挂接的程序数目 ;X\,-pjv  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 SC'fT!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 1;SWfKU?.  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey c\n\gQ:LQ  
static int KeyCount =0; `2 {x 8A  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 tM~R?9OaJ  
#pragma data_seg() ,*Sj7qb#  
y+@7k3"  
  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。 =T!M`  
S?;&vs9j  
  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^ )=N=wV  
e;,D!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 0&Zm3(}  
cKey,UCHAR cMask) o4tQ9X=}  
{ eqYa`h@g^  
 BOOL bAdded=FALSE; fAYm3+.l3  
 for(int index=0;index<MAX_KEY;index++){ IEHAPt'  
  if(hCallWnd[index]==0){ u PjJ>v  
   hCallWnd[index]=hWnd; l\a 0 k4  
   HotKey[index]=cKey; TN(1oJ:  
   HotKeyMask[index]=cMask; waldLb>7D  
   bAdded=TRUE; OSxr@  
   KeyCount++; `5Q0U%`W  
   break; sAWUtJ  
  } gTm[<Y  
 } /qEoiL###  
 return bAdded; Yaht<Hy  
} ux'!1mN  
//删除热键 +wr2TT~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dFK/  
{ 3 rV)JA  
 BOOL bRemoved=FALSE; dk# LAm0<  
 for(int index=0;index<MAX_KEY;index++){ BH0].-)[y!  
  if(hCallWnd[index]==hWnd){ _|`S9Nms  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ V'^Hn?1^  
    hCallWnd[index]=NULL; N!{('po  
    HotKey[index]=0; I 4 ,C-D  
    HotKeyMask[index]=0; 7NE"+EP\{2  
    bRemoved=TRUE; cE$7CSR  
    KeyCount--; FQ2 6(.  
    break; l`4hWs\I  
   } 9s7sn*aB#5  
  } Gk g)\ 3  
 } ?I6!m~  
 return bRemoved; gDa}8!+i  
} K1Snag  
Q,S~+bD(z  
l03{ ezJk[  
  DLL中的钩子函数如下: DY/xBwIF  
jhOQ)QE|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ZF!cXo7d  
{ w3WBgH  
 BOOL bProcessed=FALSE; #?DwOUw  
 if(HC_ACTION==nCode) =dSH8C"  
 { -|YG**i/  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 p#g o<Y#  
   switch(wParam) V(3^ev/  
   {  agp`<1h9  
    case VK_MENU: +}[M&D  
     MaskBits&=~ALTBIT; H0r@dn  
     break; 6}4?, r  
    case VK_CONTROL: GCm(3%{V%(  
     MaskBits&=~CTRLBIT; 0h=NbLr|S-  
     break; G'<:O(Imu  
    case VK_SHIFT: |C"(K-do  
     MaskBits&=~SHIFTBIT; BQTZt'p  
     break; g9C/Oj`I  
    default: //judge the key and send message >%LZ|*U  
     break; Sy()r 6n  
   } i[L5,%5<H  
   for(int index=0;index<MAX_KEY;index++){ $r+ _Y/  
    if(hCallWnd[index]==NULL) 4:wVT;?a  
     continue; v_^>*Vm*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U1nObA  
    { C)Ep}eHjf_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;&7dX^oH  
     bProcessed=TRUE; *WMI<w~_  
    } bji5X')~#  
   }  qHVZsZ  
  } Sq22]  
  else if((lParam&0xc000ffff)==1){ //有键按下 &`x1_*l  
   switch(wParam) hvW FzT5  
   { lEAf\T7  
    case VK_MENU: 8_$[SV$q  
     MaskBits|=ALTBIT; F^4mO|  
     break; iepolO=  
    case VK_CONTROL: k0r93 xa  
     MaskBits|=CTRLBIT; +q*WY*gX  
     break; p.@ kv  
    case VK_SHIFT: 6sjd:~J:  
     MaskBits|=SHIFTBIT; cvOCBg38BH  
     break; (E(J}r~E  
    default: //judge the key and send message , L_u X  
     break; {:;6 *W  
   } c o 8bnH  
   for(int index=0;index<MAX_KEY;index++){ 0nr5(4h  
    if(hCallWnd[index]==NULL) nMM:Tr  
     continue; l(A)Gd5>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <=nOyT9  
    { 2 o)8'Lp  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); d)>b/0CZ  
     bProcessed=TRUE; fM/~k>wl  
    } L0\~ K~q  
   } xqSoE[<v  
  } ,F%2'W  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 S$N!Dj@e;  
   for(int index=0;index<MAX_KEY;index++){ Fv_B(a  
    if(hCallWnd[index]==NULL) !}lCwV  
     continue; )B*D\9\Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Q6PaT@gs  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); QJ\+u  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 qt{lZ_$  
   } )WNw0cV}J>  
  } M "\Iw'5$  
 } {"PIS&]tR  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3s\}|LqX#  
} 3QI.|;X  
Llf#g#T  
  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: 'nIKkQ" N  
3-/F]}0y6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); H|)F-aL[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); pJdR`A-k|  
;IOM3'5 T@  
  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: B@j2^Dr~!  
+lplQh@RB  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) sEymwpm9  
{ YMn*i<m  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) [CG3&J  
 { b^:frjaE3  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ^]5^p9Jt"e  
  SaveBmp(); CSwPL>tUV  
  return FALSE; 1,7  
 } 3ncN) E/@  
 …… //其它处理及默认处理 ;e)`C v  
} ;RK;kdZ  
Lm8uN?  
BaVooN~C  
  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。 =28ZSo^  
9^+E$V1@  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 K+\2cf?bU  
dL]wu! wE  
  二、编程步骤 CzDV^Iv;Q{  
'iWDYZ?  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; b+`qGJrej  
yGY:EvH^?  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; V]Rt[l]  
|b4f3n  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Skg}/Ek  
+!Q*ie+q  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; S3UJ)@ E  
u!-v1O^[  
  5、 添加代码,编译运行程序。 4L bll%[9  
XL7||9,(h  
三、程序代码 '=0l{hv@  
R=2"5Hy=  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL esM r@Oc  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) x7xMSy  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ .uinv  
#if _MSC_VER > 1000 JU#m?4g  
#pragma once 'gtcy  
#endif // _MSC_VER > 1000 _WR/]1R  
#ifndef __AFXWIN_H__ "m%EFWUOl  
#error include 'stdafx.h' before including this file for PCH UHgW-N"  
#endif cd|/ 4L 6  
#include "resource.h" // main symbols T65"?=<EB  
class CHookApp : public CWinApp X[!S7[d-y  
{ sd9b9?qiu  
 public: "$/1.SX;]  
  CHookApp(); V x{   
  // Overrides O\SH;y,N  
  // ClassWizard generated virtual function overrides m3~_uc/+D  
  //{{AFX_VIRTUAL(CHookApp) 6p9 { z42  
 public: V.%LA. 8  
  virtual BOOL InitInstance(); fK _uuw4  
  virtual int ExitInstance(); '#C5m#v  
  //}}AFX_VIRTUAL ce [ Maw  
  //{{AFX_MSG(CHookApp) `mH]QjAO  
  // NOTE - the ClassWizard will add and remove member functions here. v\@pZw=x  
  // DO NOT EDIT what you see in these blocks of generated code ! H$V`,=H  
  //}}AFX_MSG $>7T s>8  
  DECLARE_MESSAGE_MAP() )5NWUuH 5  
}; ik](k"1{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); f/QwXO-U  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^T#jBqe  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _pmo 6O  
BOOL InitHotkey(); \Q^grX  
BOOL UnInit(); 4jc?9(y%  
#endif +z[+kir  
"@^Q" RF  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. &>!-67  
#include "stdafx.h" f@gvDo]Y  
#include "hook.h" b0/YX@  
#include <windowsx.h> AB{zkEuK  
#ifdef _DEBUG +cbF$,M4  
#define new DEBUG_NEW .C.b5x!  
#undef THIS_FILE xYZ,.  
static char THIS_FILE[] = __FILE__; .4ZOm'ko{  
#endif )~Gn7  
#define MAX_KEY 100 h@z0 x4_])  
#define CTRLBIT 0x04 %LM6=nt  
#define ALTBIT 0x02 L?Ys(a"k  
#define SHIFTBIT 0x01 ~MP |L?my  
#pragma data_seg("shareddata") ;%Px~g  
HHOOK hHook =NULL; NG`Y{QT6N  
UINT nHookCount =0; =XtQ\$Pax  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ^i r)z@P?V  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT O c.fvP^ZD  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey N~0ih T G5  
static int KeyCount =0; za+)2/ `L  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift G[*z,2Kb>  
#pragma data_seg() 7l ,f  
HINSTANCE hins; V;W{pd-I  
void VerifyWindow(); %NfXe[T  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) *VmX.  
//{{AFX_MSG_MAP(CHookApp)  +hKs  
// NOTE - the ClassWizard will add and remove mapping macros here. `!spi=f  
// DO NOT EDIT what you see in these blocks of generated code! =av0a !  
//}}AFX_MSG_MAP ;l1.jQh  
END_MESSAGE_MAP() B;S'l|-?  
as'yYn8  
CHookApp::CHookApp() rW090Py  
{ Bd7B\zM  
 // TODO: add construction code here, ^BM !TQ%!  
 // Place all significant initialization in InitInstance TtF+~K  
} PxQQfI>  
,"KfZf;?  
CHookApp theApp; '9=b@SaAj  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |N^"?bSt  
{ Qwt0~9n(  
 BOOL bProcessed=FALSE; ZJenwo  
 if(HC_ACTION==nCode) x.4z)2MO  
 { OrYN-A4{  
  if((lParam&0xc0000000)==0xc0000000){// Key up //;(KmU9  
   switch(wParam) Hq+QsplG  
   { g$jTP#%b  
    case VK_MENU: )[J @s=  
     MaskBits&=~ALTBIT; )iM( \=1ff  
     break; }6BXa  
    case VK_CONTROL: IuT)?S7O*k  
     MaskBits&=~CTRLBIT; ;c>"gW8  
     break; SO.u0!  
    case VK_SHIFT: j RcE241  
     MaskBits&=~SHIFTBIT; kG{};Vm  
     break; Y9|!= T%  
    default: //judge the key and send message d:w/{m% #  
     break; gS'7:UH,  
   } >~Xe` }'  
   for(int index=0;index<MAX_KEY;index++){ Yku6\/^  
    if(hCallWnd[index]==NULL) M.6uWwzQR  
     continue; -KV,l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @0s' (  
    { _"Z?O)d*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); NuSdN> 8ll  
     bProcessed=TRUE; G<=I\T'g;  
    } j}tM0Ug.U  
   } p"c6d'qe  
  } dq@ * 8ui  
  else if((lParam&0xc000ffff)==1){ //Key down qHp2;  
   switch(wParam) 0O,;[l  
   { Zs{7km  
    case VK_MENU: LSA6*Q51  
     MaskBits|=ALTBIT; !'~Ldl  
     break; /8Y8-&K0  
    case VK_CONTROL: {@iLfBh5  
     MaskBits|=CTRLBIT; >Oj$ Dn=  
     break; tq~4W% p/  
    case VK_SHIFT: l^}u S|c(  
     MaskBits|=SHIFTBIT; <8;~4"'a  
     break; ?P-O4  
    default: //judge the key and send message e"wz b< b  
     break; <" nWGF4d  
   } b r Iz8]  
   for(int index=0;index<MAX_KEY;index++) l?2  
   { i+qg*o$  
    if(hCallWnd[index]==NULL) ;4ybkOD  
     continue; bL`\l!qQx;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Exqz$'(W9  
    { 7%EIn9P  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); wM4{\  f\  
     bProcessed=TRUE; qqe"hruFJ  
    } .B- b51Uz  
   } Q-V8=.  
  } _AFje  
  if(!bProcessed){ x?V^ l*  
   for(int index=0;index<MAX_KEY;index++){ t6\H  
    if(hCallWnd[index]==NULL) %hN>o)  
     continue; P7b"(G%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) vD9\i*\2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >qB`0 3>  
   } ULxQyY;32  
  } F<4 :P=  
 } yna!L@ *@,  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,hu@V\SKv  
} HZ%V>88  
bR) P-9rs  
BOOL InitHotkey() vR:#g;mnk  
{ D.:`]W|  
 if(hHook!=NULL){ vT0Op e6m  
  nHookCount++; }=)u_q  
  return TRUE; AC(qx:/6  
 } s`H|o'0  
 else L=qhb;  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); XWAIW= .  
  if(hHook!=NULL) h6?^rS8U  
   nHookCount++; m!G(vhA,_w  
  return (hHook!=NULL); lAM)X&}0  
} v5L+B`~  
BOOL UnInit() H[p~1%Lq  
{ A r~/KRK  
 if(nHookCount>1){ -rI7ihr*  
  nHookCount--; M&V4|D  
  return TRUE; M j[+h|e  
 } ;Us6:}s  
 BOOL unhooked = UnhookWindowsHookEx(hHook); "lu^  
 if(unhooked==TRUE){ Bo8f52|  
  nHookCount=0; Z(tJd ,  
  hHook=NULL; :*,!gf  
 } ^|.T \  
 return unhooked; )s^gT]"N  
} nVWU\$Ft  
eA2*}"W  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0J'Cx&Rg  
{ Zf}2c8Vc4  
 BOOL bAdded=FALSE; W|@SXO)DY  
 for(int index=0;index<MAX_KEY;index++){ ^_Lnqk6  
  if(hCallWnd[index]==0){ USN'-Ah  
   hCallWnd[index]=hWnd; o g9|}E>  
   HotKey[index]=cKey; ?>*d82yO  
   HotKeyMask[index]=cMask; 4y+hr   
   bAdded=TRUE; SaF0JPm4z  
   KeyCount++; _ps4-<ugC  
   break; Zy3F%]V0  
  } `Zo5!"'  
 } jrN 5l1np  
 return bAdded; #e-7LmO~  
} paD[4L?4Hk  
fgtwV ji  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !gRU;ZQU_  
{ 0 fT*O  
 BOOL bRemoved=FALSE; X%-hTl  
 for(int index=0;index<MAX_KEY;index++){ CPNV\qCY  
  if(hCallWnd[index]==hWnd){ \R@}X cqZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <ZZfN@6  
    hCallWnd[index]=NULL; P;25 F  
    HotKey[index]=0; hl**G4z9q  
    HotKeyMask[index]=0; GYIQ[#'d7  
    bRemoved=TRUE; A@lM =   
    KeyCount--; jWxa [ >  
    break; 7mi*#X}  
   } ?^!J:D?  
  } U= n  
 } Q$.CtECo  
 return bRemoved; E{JTy{z-  
} M^ WoV }'  
|n,O!29  
void VerifyWindow() teDRX13=;  
{ '!Va9m*w7  
 for(int i=0;i<MAX_KEY;i++){ B &Z0ZWx  
  if(hCallWnd!=NULL){ =r]_$r%gR  
   if(!IsWindow(hCallWnd)){ !K*3bY`#  
    hCallWnd=NULL; :jTbzDqQ  
    HotKey=0; i`CNgScF>  
    HotKeyMask=0; 7SkW!5  
    KeyCount--; ,:}VbQ:3I  
   } md{1Jn"  
  } 7 8xiT  
 } 6@^ ?dQ  
} B\AyG4J  
r\b$/:y<e  
BOOL CHookApp::InitInstance() -6F\=  
{ u{W I 4n?  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^v;8 (eF  
 hins=AfxGetInstanceHandle(); Gv)*[7  
 InitHotkey(); T`v  
 return CWinApp::InitInstance(); hZ<FCY,/?  
} %:l\Vhhz  
C&d,|e "\  
int CHookApp::ExitInstance() ,bzgjw+R5  
{ 0[g5[?Vy  
 VerifyWindow(); i0x[w>\-  
 UnInit(); UeB St.  
 return CWinApp::ExitInstance(); 'SG<F,[3  
} -t`KCf,0  
|1OF!(:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file p0Ij 4   
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) '#lEUlB  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 3WkrG.$[b  
#if _MSC_VER > 1000 ,0Udz0  
#pragma once REJBm  
#endif // _MSC_VER > 1000 }darXtZKkK  
9ys[xOh WM  
class CCaptureDlg : public CDialog >> -{AR0  
{ `o+J/nc  
 // Construction W}(xE?9&  
 public: sV~|9/r  
  BOOL bTray; Cq=k3d#}  
  BOOL bRegistered; :oZ~&H5Q  
  BOOL RegisterHotkey(); 0#ePg6n  
  UCHAR cKey; 3=L5Y/  
  UCHAR cMask; i2O$oHd  
  void DeleteIcon(); x?R1/iHv  
  void AddIcon(); 2F1Bz<  
  UINT nCount; ,`ehR6b  
  void SaveBmp(); QA!'p1{#  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor M|z4Dy  
  // Dialog Data .0y .0=l  
  //{{AFX_DATA(CCaptureDlg) Y5IQhV.  
  enum { IDD = IDD_CAPTURE_DIALOG }; Y-DHW/Z~  
  CComboBox m_Key; Q?m= a0g  
  BOOL m_bControl; y7R{6W_U>  
  BOOL m_bAlt; F+Hmp\rM#  
  BOOL m_bShift; %`dVX EO  
  CString m_Path; Y#-pK)EeU  
  CString m_Number; hdH-VR4  
  //}}AFX_DATA d{'u97GDc  
  // ClassWizard generated virtual function overrides gWjz3ob  
  //{{AFX_VIRTUAL(CCaptureDlg) |2X+( F Ed  
 public: ]'i}}/}u2  
  virtual BOOL PreTranslateMessage(MSG* pMsg); /LCRi  
 protected: HFj@NRE6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support a=^>A1=  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); h7\16j  
  //}}AFX_VIRTUAL pvqbk2BO  
  // Implementation Q@l.p-:^U  
 protected: +r =p ,leb  
  HICON m_hIcon; g9gyx/'*  
  // Generated message map functions Bd13p_V"6  
  //{{AFX_MSG(CCaptureDlg) j=b-Y  
  virtual BOOL OnInitDialog(); #5IfF~* i  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); i'Q 4touy  
  afx_msg void OnPaint(); 9;pD0h|  
  afx_msg HCURSOR OnQueryDragIcon(); \%;5$ovV  
  virtual void OnCancel(); _vE[TFy  
  afx_msg void OnAbout(); ~{yQsEU  
  afx_msg void OnBrowse(); +u7nx  
  afx_msg void OnChange(); za4:Jdr  
 //}}AFX_MSG V@ph.)z  
 DECLARE_MESSAGE_MAP() =G/`r!r*0I  
}; \]t }N  
#endif f'M7x6W  
3:P "6mN  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file xOpCybmc  
#include "stdafx.h" X9uYqvP\(  
#include "Capture.h" Xu5^ly8p9q  
#include "CaptureDlg.h" a: OuDjFp  
#include <windowsx.h> 0(!=N 1l  
#pragma comment(lib,"hook.lib") G?{uR6s>#  
#ifdef _DEBUG I9r> 3?  
#define new DEBUG_NEW p8u -3  
#undef THIS_FILE c f1GA  
static char THIS_FILE[] = __FILE__; jJY!;f  
#endif a s?)6  
#define IDM_SHELL WM_USER+1 yy3-Xu4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >9]i#So^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4ze4{a^  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; L{i|OK^e  
class CAboutDlg : public CDialog Rlf#)4  
{ *[['X%f  
 public: }#f~"-O  
  CAboutDlg(); baM@HpMhM  
  // Dialog Data /3v`2=b  
  //{{AFX_DATA(CAboutDlg) L[:b\ O/p,  
  enum { IDD = IDD_ABOUTBOX }; 3/((7O[  
  //}}AFX_DATA V\o& {7!  
  // ClassWizard generated virtual function overrides 0j|JyS:}G  
  //{{AFX_VIRTUAL(CAboutDlg) @460r  
 protected: Gl>_C@n0h  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !tofO|E5  
  //}}AFX_VIRTUAL .Cf`D tK  
  // Implementation nqyB,vv0  
 protected: H#j Z'I  
  //{{AFX_MSG(CAboutDlg) vwQ6=  
  //}}AFX_MSG 4m$Xjj`vE  
  DECLARE_MESSAGE_MAP() "*aL(R  
}; dD8f`*"*=  
HBnnIbEtF'  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) )[hQK_e]  
{ .q7o7J%  
 //{{AFX_DATA_INIT(CAboutDlg) ;7 Y4 v`m  
 //}}AFX_DATA_INIT VpkkiN  
} y\"Kur*O  
G+xdh  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) )`.' QW  
{ qBIKJ  
 CDialog::DoDataExchange(pDX); ?KfV>.()  
 //{{AFX_DATA_MAP(CAboutDlg) u CNi&.  
 //}}AFX_DATA_MAP ,] ,dOIOwn  
} 9W <I~  
>w"k:O17  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) CwVORf,uA  
 //{{AFX_MSG_MAP(CAboutDlg) 42: 6=\  
 // No message handlers ;4 ON  
 //}}AFX_MSG_MAP gNG_,+=!  
END_MESSAGE_MAP() ]RJcY1  
m0 k~8^L@f  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) fgSe]q//  
: CDialog(CCaptureDlg::IDD, pParent) x:)8+Rn}  
{ SBBi"U:  
 //{{AFX_DATA_INIT(CCaptureDlg) Q7$K,7flf;  
  m_bControl = FALSE; "R/Xv+;  
  m_bAlt = FALSE; n++L =&Wd  
  m_bShift = FALSE; yqw#= fy  
  m_Path = _T("c:\\"); Zxwcj(d  
  m_Number = _T("0 picture captured."); IaLCWvHX  
  nCount=0; #A2)]XvY  
  bRegistered=FALSE; jQiK of>  
  bTray=FALSE; do1aH$Iw  
 //}}AFX_DATA_INIT 2= 6}! Y  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >)3[CU,  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ,1+)qv#|i  
} $fwv'  
2%Y]M%P  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) KGsH3{r  
{ 5 5_#?vw  
 CDialog::DoDataExchange(pDX); C"P40VQoo  
 //{{AFX_DATA_MAP(CCaptureDlg) _JjR= m  
  DDX_Control(pDX, IDC_KEY, m_Key); O:Fnxp5@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); _8CE|<Cn  
  DDX_Check(pDX, IDC_ALT, m_bAlt); m*MfGj(  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); / b_C9'S  
  DDX_Text(pDX, IDC_PATH, m_Path); (hn@+hc  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 6:(*u{  
 //}}AFX_DATA_MAP Iu`xe  
}  S=o1k  
S6r$n  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) =hO0 @w  
//{{AFX_MSG_MAP(CCaptureDlg) Ty21-0 F  
 ON_WM_SYSCOMMAND() H7KcPN(0  
 ON_WM_PAINT() BQcrF{q  
 ON_WM_QUERYDRAGICON() n%>c4*t  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) (gv1f  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) A@X&d y  
 ON_BN_CLICKED(ID_CHANGE, OnChange) .*N,x0 B(  
//}}AFX_MSG_MAP S WYIQ7*  
END_MESSAGE_MAP() jQp7TdvLE$  
=~i~SG/f  
BOOL CCaptureDlg::OnInitDialog() _^<HlfOK  
{ pk*cc h#  
 CDialog::OnInitDialog(); R)3P"sGuN  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); rVx%"_'*-  
 ASSERT(IDM_ABOUTBOX < 0xF000); ",c(cYVW  
 CMenu* pSysMenu = GetSystemMenu(FALSE); cboue LEt  
 if (pSysMenu != NULL) H\\0V.}!  
 { $vC!Us{z  
  CString strAboutMenu; 8T:|~%Sw  
  strAboutMenu.LoadString(IDS_ABOUTBOX); n\#RI9#\  
  if (!strAboutMenu.IsEmpty()) \/J7U|@Lt  
  { yE(>R(^  
   pSysMenu->AppendMenu(MF_SEPARATOR); Ccw6,2`&  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); s 9,?"\0Zm  
  } @"9^U_Qf1z  
 } Efm37Kv5l  
 SetIcon(m_hIcon, TRUE); // Set big icon Q3M;'m  
 SetIcon(m_hIcon, FALSE); // Set small icon "0F =txduS  
 m_Key.SetCurSel(0); }2^_Gaj  
 RegisterHotkey(); OA\2ja~+  
 CMenu* pMenu=GetSystemMenu(FALSE); $DmWK_A  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); <Q06<{]R8  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8$:4~:]/  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); <m"yPi3TY  
 return TRUE; // return TRUE unless you set the focus to a control MZGN,[~)6  
} {CM%QMM  
I@l' Fx  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $q]:m+Fm  
{ ?- 5{XrNm  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) T>l=0a #  
 { 6OJ`R.DM`  
  CAboutDlg dlgAbout; $z!o&3c'x  
  dlgAbout.DoModal(); )p&FDK#ob=  
 } ;O*y$|+PA  
 else -0 [^w  
 { ]>NP?S )R  
  CDialog::OnSysCommand(nID, lParam); \dAh^BK1(  
 } )&"l3*x  
} K<O1PrC  
:" 9 :J  
void CCaptureDlg::OnPaint() HL;y5o?  
{ S{7*uK3$  
 if (IsIconic()) 4#$~gTc@  
 { qm-G=EX  
  CPaintDC dc(this); // device context for painting +1j@n.)ft  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); [-)N}rL>  
  // Center icon in client rectangle (Yz EsY  
  int cxIcon = GetSystemMetrics(SM_CXICON); `p@YV(  
  int cyIcon = GetSystemMetrics(SM_CYICON); ~yH<,e  
  CRect rect; *~F\k):>  
  GetClientRect(&rect); tN&x6O+@  
  int x = (rect.Width() - cxIcon + 1) / 2; 8Yr_$5R  
  int y = (rect.Height() - cyIcon + 1) / 2; wf!?'*  
  // Draw the icon ^zv0hGk2  
  dc.DrawIcon(x, y, m_hIcon); +$KUy>  
 } Np4';H  
 else Hmt} @  
 { nYJ)M AG@  
  CDialog::OnPaint(); w(O/mUDX  
 } {{c/:FTEU  
} o +sb2:x  
fRp+-QvE  
HCURSOR CCaptureDlg::OnQueryDragIcon() g@!mV)c97  
{ PN ,pEk|  
 return (HCURSOR) m_hIcon; G992{B  
} !/W[6'M#p  
*ip2|2G$  
void CCaptureDlg::OnCancel() 8=rD'*  
{ e_Na_l]  
 if(bTray) EQDs bG0x  
  DeleteIcon(); c"w}<8  
  CDialog::OnCancel(); [hs_HYqJ  
} _&TA|Da  
%./vh=5)  
void CCaptureDlg::OnAbout() H]V@Q~?e  
{ {VBx;A3*I  
 CAboutDlg dlg; 3okh'P%+  
 dlg.DoModal(); 99%oY  
} T/DKT1P-  
A`Vz5WB  
void CCaptureDlg::OnBrowse() 8OoKP4,;  
{ `mTpL^f  
 CString str; aZt5/|B  
 BROWSEINFO bi; 8RJXY:%  
 char name[MAX_PATH]; tMxa:h;/x  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); L>~wcoB  
 bi.hwndOwner=GetSafeHwnd(); 3+mC96wN  
 bi.pszDisplayName=name; OOy]:t4 /  
 bi.lpszTitle="Select folder"; . :Q[Z  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ~^((tT  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi);  LAG*H  
 if(idl==NULL) L&O!"[++  
  return; Az.(tJ X"  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 5z8CUDt 0  
 str.ReleaseBuffer(); n?vw|'(}  
 m_Path=str; }eUeADbC  
 if(str.GetAt(str.GetLength()-1)!='\\') 5gnNgt~  
  m_Path+="\\"; ]J;pUH+u  
 UpdateData(FALSE); 2GNtO!B.  
} 0d!1;jy,T  
iiS^xqSNCt  
void CCaptureDlg::SaveBmp() {ndL]c'v  
{ |7Fe~TC  
 CDC dc; J;|r00M  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 7`;55Se  
 CBitmap bm; ~kUdHne (  
 int Width=GetSystemMetrics(SM_CXSCREEN); XXsN)2  
 int Height=GetSystemMetrics(SM_CYSCREEN); 1&A@Zo5|  
 bm.CreateCompatibleBitmap(&dc,Width,Height); W99MA5P  
 CDC tdc; G8%Q$  
 tdc.CreateCompatibleDC(&dc); H)&6I33`  
 CBitmap*pOld=tdc.SelectObject(&bm); %a%x`S3  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); gqR?hZD  
 tdc.SelectObject(pOld); [MfKBlA  
 BITMAP btm; DC4,*a~  
 bm.GetBitmap(&btm); ?4%'6R  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; t_HS0rxG  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); .#zmX\a  
 BITMAPINFOHEADER bih; f\O)+Vc  
 bih.biBitCount=btm.bmBitsPixel; Ag1*.t|  
 bih.biClrImportant=0; o@TxDG  
 bih.biClrUsed=0; H\7#$ HB  
 bih.biCompression=0; P@P(&{@  
 bih.biHeight=btm.bmHeight; et|QW;*L  
 bih.biPlanes=1; B. Rc s  
 bih.biSize=sizeof(BITMAPINFOHEADER); p!^.;c  
 bih.biSizeImage=size; 2 2K:[K  
 bih.biWidth=btm.bmWidth;  DJ?kQ  
 bih.biXPelsPerMeter=0; e573UB  
 bih.biYPelsPerMeter=0; 16"eyt>  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ]Igd<  
 static int filecount=0; *sI`+4h[  
 CString name; 8 x$BbK  
 name.Format("pict%04d.bmp",filecount++); \ FW{&X9a  
 name=m_Path+name; 0{bGVLp  
 BITMAPFILEHEADER bfh; ssVO+ T  
 bfh.bfReserved1=bfh.bfReserved2=0; Qhlgu!  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ,L ;ueAo  
 bfh.bfSize=54+size; 'V";"Ei  
 bfh.bfOffBits=54; j)IXe 0dMC  
 CFile bf; >SO !{  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ C'x?riJ/  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Sc Uh -y_  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); /Po't(-x  
  bf.WriteHuge(lpData,size); 2Cd#~  
  bf.Close(); lWj{pyZ  
  nCount++; o~7~S  
 } (=:9pbP  
 GlobalFreePtr(lpData); ax{+7  k  
 if(nCount==1) ;O=tSEe  
  m_Number.Format("%d picture captured.",nCount); p9]008C89  
 else 9Z}Y2:l'  
  m_Number.Format("%d pictures captured.",nCount); .kWMr^ g  
  UpdateData(FALSE); i=$##  
} \tf \fa  
&oJ=   
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) KKm &~^c  
{ wYnsd7@I  
 if(pMsg -> message == WM_KEYDOWN) +Bk d  
 { Mx<V;GPm  
  if(pMsg -> wParam == VK_ESCAPE) vt0XCUnK  
   return TRUE; {KJ!rT  
  if(pMsg -> wParam == VK_RETURN) 6 R}]RuFQ  
   return TRUE; JSXudz5 c  
 } ,f0|eu>  
 return CDialog::PreTranslateMessage(pMsg); j'Ry.8}  
} g.yr) LHt0  
K3jKOV8   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ] h3~>8<  
{ ,$irJz F  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ rlSar$  
  SaveBmp(); JR/:XYS+  
  return FALSE; b4`t, D  
} +4G]!tV6  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ l);M(<  
 CMenu pop; gMe)\5`\Y  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); {E *dDv  
 CMenu*pMenu=pop.GetSubMenu(0); ,Bh!|H(?L1  
 pMenu->SetDefaultItem(ID_EXITICON); "~~Js~  
 CPoint pt; JWhi*je  
 GetCursorPos(&pt); TR:V7 d  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); df_hmkyj  
 if(id==ID_EXITICON) X yi[z tN  
  DeleteIcon();  JvFd2@  
 else if(id==ID_EXIT) [DS.@97n  
  OnCancel(); * SH5p  
 return FALSE; Ua^#.K  
} hl`4_`3y  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); h}PeXnRU  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ] ?!#*<t r  
 AddIcon(); R;+vE'&CO  
 return res; ??& Q"6Oe  
} &2-dZK  
&DoYz[q  
void CCaptureDlg::AddIcon() !{'C.sb?~  
{ c#'t][Ii  
 NOTIFYICONDATA data; Fj? Q4_  
 data.cbSize=sizeof(NOTIFYICONDATA); -xg$qvK  
 CString tip; 9 cU]@j}2  
 tip.LoadString(IDS_ICONTIP); J^tLKTB  
 data.hIcon=GetIcon(0); )}QtK+Rq  
 data.hWnd=GetSafeHwnd(); x6Q,$B  
 strcpy(data.szTip,tip); r;}%} /IX  
 data.uCallbackMessage=IDM_SHELL; LIfQh  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Ne7HPSWiOP  
 data.uID=98;  + ]I7]  
 Shell_NotifyIcon(NIM_ADD,&data); eUP.:(E  
 ShowWindow(SW_HIDE); Fc{M N"  
 bTray=TRUE; )C^ZzmB  
} ;Fw{p{7<  
r8.R?5F@  
void CCaptureDlg::DeleteIcon() bgD4;)?5b  
{ [(Z{5gK  
 NOTIFYICONDATA data; I8*_\Ez  
 data.cbSize=sizeof(NOTIFYICONDATA); QWL$F:9:  
 data.hWnd=GetSafeHwnd(); jK`b6:#(,  
 data.uID=98; Z$qLY<aV  
 Shell_NotifyIcon(NIM_DELETE,&data); xUT]6T0dB  
 ShowWindow(SW_SHOW); hSQ*_#  
 SetForegroundWindow(); S]_iobWK  
 ShowWindow(SW_SHOWNORMAL); 1/b5i8I2 v  
 bTray=FALSE; HRX}r$  
} X>}-UHKV+  
9FB k|g"U)  
void CCaptureDlg::OnChange() \@")2o+  
{ }HdibCAOf  
 RegisterHotkey(); } a#RX$d&  
} "u#,#z_  
p0c*)_a*  
BOOL CCaptureDlg::RegisterHotkey() sw<GlF"  
{ R_? Q`+X  
 UpdateData(); ]w7wwU^^*U  
 UCHAR mask=0; fpd4 v|(  
 UCHAR key=0; a=m4)tjk  
 if(m_bControl) ?T.'  q  
  mask|=4; %x(||cq  
 if(m_bAlt) Tj0qq.  
  mask|=2; u!$+1fI>  
 if(m_bShift) 90R z#qrI*  
  mask|=1; 7$"{&T  
  key=Key_Table[m_Key.GetCurSel()]; -M\ae  
 if(bRegistered){ pBo=omQV  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Y.>F fL  
  bRegistered=FALSE; -8Z;s8ACo  
 }  862e  
 cMask=mask; bU$4"_eA B  
 cKey=key; Z=c&</9e  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ),DLrGOl  
 return bRegistered; {tE9m@[AF  
} CKB~&>xx  
&E& _Z6#  
  四、小结 -jXO9Q  
Epo/}y  
  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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