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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: !{4bC  
  ^qPS&G  
  一、实现方法 D?P1\<A~  
8yCQWDE}  
  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: ,IG?(CK|  
;%Zn)etu  
#pragma data_seg("shareddata") "3VMjF\  
HHOOK hHook =NULL; //钩子句柄 1{bsh?zd  
UINT nHookCount =0; //挂接的程序数目 lHSu T2)x;  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 fg8U* 7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 #VM-\02o  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey /qO?)p3gk  
static int KeyCount =0; 9h'klaE(  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ,7izrf8  
#pragma data_seg() 8}Su7v1  
*M()z.N  
  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。 SK {ALe  
R6 dD17  
  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: f*ZIBTb 9  
%/=#8v4*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR qU:Mvb^5&  
cKey,UCHAR cMask) x2H?B` 5  
{ ;PhX[y^*  
 BOOL bAdded=FALSE; vq*)2.  
 for(int index=0;index<MAX_KEY;index++){ }_o!f V  
  if(hCallWnd[index]==0){ `K \(I#z  
   hCallWnd[index]=hWnd; ,a?$F1Z-  
   HotKey[index]=cKey; "e~"-B7(\Y  
   HotKeyMask[index]=cMask; ZYD3[" ~x  
   bAdded=TRUE; Y7 `i~K;  
   KeyCount++; 9oJ=:E~CP  
   break; [)83X\CO  
  } e025m}%SU  
 } U^{'"x+  
 return bAdded; I4^}C;p0?  
} $NhKqA`0  
//删除热键 QyX ?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Kly`V]XE  
{ &d^u$Y5  
 BOOL bRemoved=FALSE; m8njP-CZ  
 for(int index=0;index<MAX_KEY;index++){ W]DZ'  
  if(hCallWnd[index]==hWnd){ fF} NPl  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ aqAWaO  
    hCallWnd[index]=NULL; 8k`rj;  
    HotKey[index]=0; N>4uqFo  
    HotKeyMask[index]=0; vd'd@T  
    bRemoved=TRUE; f.&Y_G3a<  
    KeyCount--; VC@{cVT  
    break; @AU<'?k  
   } ^gD%#3>X  
  } 5KFd/9  
 } =e$6o2!'}  
 return bRemoved; wH Q$F(by  
} 4`#3p@-  
= A;B-_c  
zg83->[  
  DLL中的钩子函数如下: pg'3j3JW$  
\;Ywr3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ONw;NaE,  
{ jPf*qe>U  
 BOOL bProcessed=FALSE; ?4i:$.A Y  
 if(HC_ACTION==nCode) 4#BoS9d2I<  
 { =D2x@ank[  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 < l%3P6|  
   switch(wParam) x0!5z1KQh  
   {  YaDr.?  
    case VK_MENU: $!_]mz6*  
     MaskBits&=~ALTBIT; , 1{)B  
     break; (S[" ak  
    case VK_CONTROL: jTJ]: EN  
     MaskBits&=~CTRLBIT; T7{Z0-  
     break; .<C}/Cl  
    case VK_SHIFT: :LwNOuavN  
     MaskBits&=~SHIFTBIT; xW;-=Q  
     break; GKNH{|B$D  
    default: //judge the key and send message 2So7fZa^wg  
     break; U ExK|t  
   } yEe4{j$  
   for(int index=0;index<MAX_KEY;index++){ UldG0+1d  
    if(hCallWnd[index]==NULL) s]=s|  
     continue; ;h"?h*}m!\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,HFoy-Yq  
    { duKR;5:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); YkKq}DXj  
     bProcessed=TRUE; <([1(SY2e  
    } "38ya2*  
   } .V?i3  
  } `%x6;Ha  
  else if((lParam&0xc000ffff)==1){ //有键按下 :+SpZ>  
   switch(wParam) &T8prE?  
   { / 1jb8w'  
    case VK_MENU: Tv& -n  
     MaskBits|=ALTBIT; |? !Ew# w  
     break; D+.h *{gD  
    case VK_CONTROL: 4u zyU_  
     MaskBits|=CTRLBIT; uwl;(zwh_  
     break; IZ;%lV7t  
    case VK_SHIFT: : qKxm(  
     MaskBits|=SHIFTBIT; +Zx+DW cq  
     break; Zq--m/  
    default: //judge the key and send message +FWkhmTv  
     break; I T)rhi:  
   } i[~oMwc&  
   for(int index=0;index<MAX_KEY;index++){ b0 CtQe  
    if(hCallWnd[index]==NULL) zhDmZ  
     continue; hY.zwotH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u$N2uFc  
    { c%aY6dQG&%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); rlvo&(a  
     bProcessed=TRUE; 3+;}2x0-F  
    } byYdX'd.  
   } {@u;F2?  
  } {iqH 27\E  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 V=}b>Jo2j  
   for(int index=0;index<MAX_KEY;index++){ L_.BcRy  
    if(hCallWnd[index]==NULL) 9IKFrCO9,  
     continue; VN[h0+n4Th  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) dE*n!@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;wfzlUBC  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Nt^R~#8hF>  
   } r[zxb0YA  
  } &WIiw$@  
 } \k1psqw^O  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); J(0.eD91v  
} h$p]#]uMb  
Nw}y_Qf{  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: !aD/I%X  
Zi=Nr3b  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); TE4{W4I  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <a|$ Bl  
Ctxs]S tU%  
  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: Yw=Ve 0  
#5kQn>R  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) xn&G`  
{ <@}~Fp@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) *]fBd<(8  
 { 2;G^>BP<  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \+E{8&TH'  
  SaveBmp(); bIP{DxKS  
  return FALSE; VpJ/M(UD-  
 } e uS"C*  
 …… //其它处理及默认处理 (xJ6 : u  
} aD,sx#g0  
Efb>ZQ  
bE2^sx`(  
  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。 8H3|i7.1h  
@eN x:}  
  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。 )eNR4nF  
?5nF` [rx  
  二、编程步骤 e%&2tf4  
SUXRWFl  
  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"; T^8t<S@`  
udDhJ?  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; nsqs*$  
NaSgK  
  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; f0fN1  
Au$|@  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; Ql> DS~a  
bR@ e6.<i  
  5、 添加代码,编译运行程序。 {Q[{H'Oa  
^WP`;e  
三、程序代码 FFl[[(`%D  
_|xO4{X  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "P=OpFV  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) + ?n81|7`  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Crmxsw.W^Y  
#if _MSC_VER > 1000 l;: L0(('  
#pragma once , gk49z9  
#endif // _MSC_VER > 1000 7_taqcj  
#ifndef __AFXWIN_H__ !Ac<A.  
#error include 'stdafx.h' before including this file for PCH U(DK~#}  
#endif gk\IivPb  
#include "resource.h" // main symbols l [?o du4  
class CHookApp : public CWinApp ]:JoGGE a0  
{ PD12gUU?  
 public: ~AxA ,  
  CHookApp(); HcA;'L?Dw  
  // Overrides 9@ 6y(#s  
  // ClassWizard generated virtual function overrides ^SB?NRk  
  //{{AFX_VIRTUAL(CHookApp) nnX,_5s  
 public: bE.,)GY  
  virtual BOOL InitInstance();  Q0' xn  
  virtual int ExitInstance(); '<~l% q  
  //}}AFX_VIRTUAL @.T '>;izr  
  //{{AFX_MSG(CHookApp) "o/:LCE  
  // NOTE - the ClassWizard will add and remove member functions here. Zf |%t  
  // DO NOT EDIT what you see in these blocks of generated code ! kt.z,<w5O  
  //}}AFX_MSG W~+ ] 7<  
  DECLARE_MESSAGE_MAP() XKB)++Q=  
}; >tnQuFKg]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ^$SI5WK&)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); d0~F|j\#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); n5A0E2!  
BOOL InitHotkey(); 0'`>20Y  
BOOL UnInit(); Iodk1Y;  
#endif X>j% y7v  
Oemi}  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. `uy)][j-  
#include "stdafx.h" ulV)X/]1  
#include "hook.h" f8kPbpV,  
#include <windowsx.h> .{x-A{l  
#ifdef _DEBUG 9l9 nT  
#define new DEBUG_NEW Ub*Gv(Pg  
#undef THIS_FILE zE5%l`@|o  
static char THIS_FILE[] = __FILE__;  XeDiiI  
#endif Vu0jNKUV  
#define MAX_KEY 100 C Fq3  
#define CTRLBIT 0x04 4G0Er?D   
#define ALTBIT 0x02 =4uL1[0'  
#define SHIFTBIT 0x01 *Hy-D</w%  
#pragma data_seg("shareddata") tM]~^U  
HHOOK hHook =NULL; '9%72yG  
UINT nHookCount =0; R)d1]k8  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Bs(\e^}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT XRCiv  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey xtYX}u  
static int KeyCount =0; fEE[h uG  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift DcA{E8Y  
#pragma data_seg() R9nW5f Nf  
HINSTANCE hins; I~?D^   
void VerifyWindow(); bmVksi2b  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 0gw0  
//{{AFX_MSG_MAP(CHookApp) nS)U+q-x&o  
// NOTE - the ClassWizard will add and remove mapping macros here. js)M c*]&  
// DO NOT EDIT what you see in these blocks of generated code! %719h>$  
//}}AFX_MSG_MAP -jdS8n4  
END_MESSAGE_MAP() HtB>#`'  
0]=|3-n  
CHookApp::CHookApp() J3gJSRT@P  
{ K>X#,lE-  
 // TODO: add construction code here, )WavG1  
 // Place all significant initialization in InitInstance 13wO6tS k  
} Aq%TZ_m  
__M(dN(^  
CHookApp theApp; }.ZX.qYX  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %!I7tR#;  
{ Gs;wx_k^  
 BOOL bProcessed=FALSE; .dX ^3  
 if(HC_ACTION==nCode) hAtf)  
 { nI.K|hU:P  
  if((lParam&0xc0000000)==0xc0000000){// Key up ;QkUW<(  
   switch(wParam) "n3r,  
   { HpY-7QTPJ~  
    case VK_MENU: 3:Q5dr+1_  
     MaskBits&=~ALTBIT; ;rZR9fR  
     break; OjTb2[Q  
    case VK_CONTROL: UZ7Zzc#g  
     MaskBits&=~CTRLBIT; L#mf[a@pCn  
     break; O4J <u-E$  
    case VK_SHIFT: [E<NEl *  
     MaskBits&=~SHIFTBIT; =V~p QbZ  
     break; >J!4x(;Yh  
    default: //judge the key and send message 7p*PDoM6`  
     break; .1<QB{4~v  
   } P}hHx<L  
   for(int index=0;index<MAX_KEY;index++){ t=o2:p6&  
    if(hCallWnd[index]==NULL) &7_xr.c7  
     continue; / r6^]grg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _Y@vO  
    { W5 ^eCYHoi  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); r:0F("},  
     bProcessed=TRUE; wb~B Y  
    } b>SG5EqU@  
   } l =~EweuM  
  } 5<ZE.'O  
  else if((lParam&0xc000ffff)==1){ //Key down K}7E;O5m"  
   switch(wParam) koDIxj'%X  
   { @-=0T!/  
    case VK_MENU: 1"tyxAo\  
     MaskBits|=ALTBIT; ?D ?_D,"C  
     break; c-1,((p  
    case VK_CONTROL: ieuq9ah#  
     MaskBits|=CTRLBIT; :b t;DJ@  
     break; 1) 7n (  
    case VK_SHIFT: vOIK6-   
     MaskBits|=SHIFTBIT; Ahl-EVIr<  
     break; 4.Luy  
    default: //judge the key and send message >dO1)  
     break; R5OP=Q8  
   } Aiyx!Q6vT  
   for(int index=0;index<MAX_KEY;index++) $Y'}wB{pc  
   { MYNNeO  
    if(hCallWnd[index]==NULL) ]e`&py E  
     continue; C#<b7iMg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8Ld{Xg  
    { SQ&nQzL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); A$d)xq-]K  
     bProcessed=TRUE; &%eWCe+ +  
    } Wk<heF  
   } Xc8r[dX  
  } b>g&Pf#N!  
  if(!bProcessed){ xE>H:YPm  
   for(int index=0;index<MAX_KEY;index++){ ]mIcK  
    if(hCallWnd[index]==NULL) 8i$quHd&x  
     continue; i/UDda"E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) J:W|2U="  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); E%Tpby}^'  
   } 4-j3&(  
  } TOF_m$@#  
 } 4mHR+SZy  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); V9KI?}q:W  
} ` mvPbZ0<  
K|^PHe  
BOOL InitHotkey() ctg U  
{ S7oPdzcU-  
 if(hHook!=NULL){ }-`N^  
  nHookCount++; %vF,wQC  
  return TRUE; l-^2>K[  
 } s"OP[YEke/  
 else gR5 EK$  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); jGm`Qg{<  
  if(hHook!=NULL) ky4 ;7RK  
   nHookCount++; HKB?G~  
  return (hHook!=NULL); q|7i6jq\*R  
} P"-*'q,9  
BOOL UnInit() ~l {*XM  
{ RBOb/.$  
 if(nHookCount>1){ pg<m0g@W*;  
  nHookCount--; #3VOC#.  
  return TRUE; {*yFTP"93  
 } ws/e~ T<c  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 69q#Zw[,,  
 if(unhooked==TRUE){ h D5NX  
  nHookCount=0; ^Pwtu  
  hHook=NULL; TA4>12C6  
 } 5:R$xgc  
 return unhooked; jpwR\"UJ  
} ;*{"|l qe  
Tumv0=q4wd  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "mk@p=d  
{ DtEvt+h  
 BOOL bAdded=FALSE; 6DkFIkS  
 for(int index=0;index<MAX_KEY;index++){ *sJT\J$D[  
  if(hCallWnd[index]==0){ \p4>onGI  
   hCallWnd[index]=hWnd; =Ff _)k  
   HotKey[index]=cKey; ZYS`M?Au  
   HotKeyMask[index]=cMask; bm>N~DC  
   bAdded=TRUE; bwR$9 10b  
   KeyCount++; 7];AB;0"  
   break; 8n&Gn%DvX  
  } !l6Ez_'  
 } P^3`znq{  
 return bAdded; $Wy(Wtrx|  
} %3%bRP  
o:wI{?%-3  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yf4I<v$y  
{ ;OMR5KAz  
 BOOL bRemoved=FALSE; N4HIQ\p  
 for(int index=0;index<MAX_KEY;index++){ 6y+_x'  
  if(hCallWnd[index]==hWnd){ hr@kU x  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :QoW*Gs1  
    hCallWnd[index]=NULL; kuq&8f~!  
    HotKey[index]=0; 42oW]b%P{;  
    HotKeyMask[index]=0; B}(r>8?dm  
    bRemoved=TRUE; /nq\*)S#&  
    KeyCount--; aRV .;S  
    break; QjlQsN!  
   } 8l.bT|#O  
  } ApD`i+Y@  
 } !jQj1QZR`  
 return bRemoved; G'U! #  
} Rs@>LA  
"M;aNi^B  
void VerifyWindow() fEo5j`}  
{ 8@ZZ[9kt  
 for(int i=0;i<MAX_KEY;i++){ T)Y{>wT  
  if(hCallWnd!=NULL){ oNEjlV*  
   if(!IsWindow(hCallWnd)){ <da-iY\5  
    hCallWnd=NULL; |LLDaA-=0  
    HotKey=0; @fQvAok  
    HotKeyMask=0; XN^l*Q?3n  
    KeyCount--; 56?RFnZ&j  
   } %f?Z/Wn  
  } fsjCu!  
 } y9Q #%a8V  
} g:fkM{"{  
!AXt6z cZ  
BOOL CHookApp::InitInstance() b!<\#[ A4  
{ drQI@sPp  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); .fgVzDR|+  
 hins=AfxGetInstanceHandle(); >~;= j~  
 InitHotkey(); V8hmfV~=]P  
 return CWinApp::InitInstance(); F$j?}  
} OZR{+YrB^  
( 5 BZZ  
int CHookApp::ExitInstance() ^ 'ws/(  
{ h-<Qj,L{W  
 VerifyWindow(); "h5.^5E6  
 UnInit(); cx ~XG  
 return CWinApp::ExitInstance(); ~@\sN+VS  
} |SfCuV#g/<  
7_Op(C4,nC  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file .3'U(U  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) oLS/  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ [gDl<6a#4  
#if _MSC_VER > 1000 t-i\gq^  
#pragma once (PC)R9r5  
#endif // _MSC_VER > 1000 2EH0d6nt  
Ya &\b 6  
class CCaptureDlg : public CDialog 2b/Cs#-  
{ hLr\;Swyp  
 // Construction /o^/ J~/3  
 public: _+9o'<#u(  
  BOOL bTray; >} E  
  BOOL bRegistered; G3o`\4p  
  BOOL RegisterHotkey(); }60/5HNr  
  UCHAR cKey; [Y4Wm?  
  UCHAR cMask; 3wMnTT"At  
  void DeleteIcon(); 4(dgunP  
  void AddIcon(); (h|E@gRa  
  UINT nCount; |va^lT  
  void SaveBmp();  5]*!N  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor v~A*?WU;n  
  // Dialog Data &^7(?C' u  
  //{{AFX_DATA(CCaptureDlg) lhPxMMS`j  
  enum { IDD = IDD_CAPTURE_DIALOG }; +!K*FU=).  
  CComboBox m_Key; u}.mJDL  
  BOOL m_bControl; >QdT 7gB  
  BOOL m_bAlt; !;UoZ~  
  BOOL m_bShift; nT%ko7~-  
  CString m_Path; >qVSepK3  
  CString m_Number; (<}BlL   
  //}}AFX_DATA qP$)V3l  
  // ClassWizard generated virtual function overrides _fccZf(yC.  
  //{{AFX_VIRTUAL(CCaptureDlg) @R Jr ~y0  
 public: r=/$}l4  
  virtual BOOL PreTranslateMessage(MSG* pMsg); iS< ^MD  
 protected:  R;zf x/  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support uO)vGzt3^x  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2;K2|G7  
  //}}AFX_VIRTUAL &O5O@3:7]  
  // Implementation `n RF"T_  
 protected: +{#L,0t  
  HICON m_hIcon; g2?yT ?  
  // Generated message map functions hEFOT]P4  
  //{{AFX_MSG(CCaptureDlg) 26;Gt8  
  virtual BOOL OnInitDialog(); NwVhJdo  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ]=p^32  
  afx_msg void OnPaint(); "yc|ng  
  afx_msg HCURSOR OnQueryDragIcon(); I+,CiJ|4  
  virtual void OnCancel(); c^<~Y$i  
  afx_msg void OnAbout(); ]_j= { 0%  
  afx_msg void OnBrowse(); p=m:^9/  
  afx_msg void OnChange(); !4T!@"#  
 //}}AFX_MSG m8V}E& 6  
 DECLARE_MESSAGE_MAP() Q_Wg4n5  
}; `2/V.REX$h  
#endif D/afa8>LQH  
eM@xs<BR  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 91-[[<  
#include "stdafx.h" tAPf#7{|   
#include "Capture.h" yp[,WZt  
#include "CaptureDlg.h" .%!^L#g  
#include <windowsx.h> TT no  
#pragma comment(lib,"hook.lib") EywBT  
#ifdef _DEBUG os7xwI;T  
#define new DEBUG_NEW cTq;<9Iew  
#undef THIS_FILE 3~{0X-  
static char THIS_FILE[] = __FILE__; DJ9x?SL@KD  
#endif /|lAxAm?  
#define IDM_SHELL WM_USER+1 W4bN']?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;E ,i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p: )=i"uL  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; S503b*pM  
class CAboutDlg : public CDialog w:/3%-  
{ kZ PL$ \/A  
 public: CvR-lKV<  
  CAboutDlg(); %@:6&  
  // Dialog Data T2n3g|4  
  //{{AFX_DATA(CAboutDlg) S>)[n]f  
  enum { IDD = IDD_ABOUTBOX }; %WC ^aKfY  
  //}}AFX_DATA #hP>IU  
  // ClassWizard generated virtual function overrides &F:.OVzX  
  //{{AFX_VIRTUAL(CAboutDlg) 2C1NDrS;}  
 protected: ?bpV dm!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S{3c}>n  
  //}}AFX_VIRTUAL z4~p(tl  
  // Implementation 7<Qmpcp =  
 protected: wFMw&=j  
  //{{AFX_MSG(CAboutDlg) 4*D"*kR;  
  //}}AFX_MSG /2 hk9XM  
  DECLARE_MESSAGE_MAP() &po!X )  
}; 9 r&JsCc  
~ivOSr7s}  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) gX7R-&[UD  
{ IT)3Et@Y  
 //{{AFX_DATA_INIT(CAboutDlg) C#4_`4{  
 //}}AFX_DATA_INIT >q0%yh-  
} IA{W-RRb  
!{{gL=_@  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) |fIyq}{7  
{ f$tm<:)Y  
 CDialog::DoDataExchange(pDX); T:Ovh.$  
 //{{AFX_DATA_MAP(CAboutDlg) 7>f"4r_r6<  
 //}}AFX_DATA_MAP u:f.;?  
} ksCF"o /@V  
-SfU.XlZl  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 8O$ LY\G  
 //{{AFX_MSG_MAP(CAboutDlg) 3m9b  
 // No message handlers (,tu7u{  
 //}}AFX_MSG_MAP [ [w |  
END_MESSAGE_MAP() nMZ)x-  
qGX#(,E9;  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +jK-k_  
: CDialog(CCaptureDlg::IDD, pParent) IibYGF  
{ ,QpFVlPU  
 //{{AFX_DATA_INIT(CCaptureDlg) gWoUE7.3`  
  m_bControl = FALSE; ~ rQ,%dH  
  m_bAlt = FALSE; ?Pa(e)8\  
  m_bShift = FALSE; u>G9r#~`k  
  m_Path = _T("c:\\"); 9zS   
  m_Number = _T("0 picture captured."); =*I|z+  
  nCount=0; 8 ]exsn Z  
  bRegistered=FALSE; ,Si{]y  
  bTray=FALSE; Z1:%Aq xP  
 //}}AFX_DATA_INIT 3!osQ1  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 {y a .  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); pkae91  
} &oq 0XV.M^  
Goc?HR  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) w^ OB  
{ ~#jiX6<I  
 CDialog::DoDataExchange(pDX); 7Xu#|k  
 //{{AFX_DATA_MAP(CCaptureDlg) zA8@'`Id  
  DDX_Control(pDX, IDC_KEY, m_Key); wpN3-D  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); fISK3t/=C  
  DDX_Check(pDX, IDC_ALT, m_bAlt); _ilitwRN3  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); UAT\ .  
  DDX_Text(pDX, IDC_PATH, m_Path); /PeT4hW}  
  DDX_Text(pDX, IDC_NUMBER, m_Number); eU@Mv5&6  
 //}}AFX_DATA_MAP 5 7t.Ud  
} 1kw*Q:   
)dqNN tS  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) mJ=V <_  
//{{AFX_MSG_MAP(CCaptureDlg) 7s#8-i  
 ON_WM_SYSCOMMAND() oI[rxr  
 ON_WM_PAINT() xVbRCu#Z  
 ON_WM_QUERYDRAGICON() G_J}^B*?%v  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ]K*R[  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) gwQMy$  
 ON_BN_CLICKED(ID_CHANGE, OnChange) iB"ji4[z  
//}}AFX_MSG_MAP abm 3q!a-  
END_MESSAGE_MAP() Um 6}h@>  
lZ.lf.{F  
BOOL CCaptureDlg::OnInitDialog() TH'8^wf  
{ [A/2 Ms  
 CDialog::OnInitDialog(); RJzIzv99m  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); kHylg{i{"  
 ASSERT(IDM_ABOUTBOX < 0xF000); d+,!p8Q  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;nP(S`'  
 if (pSysMenu != NULL) 5cinI^x)f  
 { M TZCI}  
  CString strAboutMenu; Z#-N$%^F  
  strAboutMenu.LoadString(IDS_ABOUTBOX); kx?Yin8K  
  if (!strAboutMenu.IsEmpty()) MO0NNVVi%U  
  { Y`(Ri-U4  
   pSysMenu->AppendMenu(MF_SEPARATOR); _1qR1< V  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 3MFT P5~  
  } @R50M (@W  
 } #` gu<xlW  
 SetIcon(m_hIcon, TRUE); // Set big icon Xi) ;dcNJ  
 SetIcon(m_hIcon, FALSE); // Set small icon rMi\#[o B  
 m_Key.SetCurSel(0); v-d"dC`  
 RegisterHotkey(); SFd_k9  
 CMenu* pMenu=GetSystemMenu(FALSE); ){w{#  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); gqy>;A:kO  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); fc8ODk*;E  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); k|?[EWIi^  
 return TRUE; // return TRUE unless you set the focus to a control 3&7? eO7*  
} VGD~) z57  
(0b\%;}  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 7=^}{  
{ k[ zyR  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) o]Ne|PEpO  
 { Y;_F,4H  
  CAboutDlg dlgAbout; P.@dB.Ny  
  dlgAbout.DoModal(); 7Tdx*1 U  
 } }7 +%k/  
 else /go[}X5QR[  
 {  gmbRH5k  
  CDialog::OnSysCommand(nID, lParam); 8]^|&"i.\d  
 } Wn+s:o v  
} #eOHe4Vt  
,^8':X"A{!  
void CCaptureDlg::OnPaint() jaodcT0  
{ IRx% L?  
 if (IsIconic()) 7$Z_'GJ]1C  
 { 5(J?C-Pk  
  CPaintDC dc(this); // device context for painting D^6iQW+.P  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); g/!MEOVx  
  // Center icon in client rectangle UIyLtoxu  
  int cxIcon = GetSystemMetrics(SM_CXICON); O}Pqbx&  
  int cyIcon = GetSystemMetrics(SM_CYICON); )5~T%_  
  CRect rect; b)Da6fp  
  GetClientRect(&rect); 7 uL.=th'  
  int x = (rect.Width() - cxIcon + 1) / 2; SA}Dkt&,  
  int y = (rect.Height() - cyIcon + 1) / 2; = NZgbl  
  // Draw the icon f0sLe 3  
  dc.DrawIcon(x, y, m_hIcon); 03v+eT  
 } ^C ~Ryw7  
 else U@y)x+:  
 { qzbW0AM[M  
  CDialog::OnPaint(); M' z.d  
 } g^+p7G  
} LxhS 9  
(KyOo,a  
HCURSOR CCaptureDlg::OnQueryDragIcon() re[5lFQ~Z  
{ wrgB =o  
 return (HCURSOR) m_hIcon; 2} pZyS  
} BYEZ[cM  
JS^DyBXc  
void CCaptureDlg::OnCancel() G`O*AQ}[  
{ rP7 QW)NF  
 if(bTray) c86KDEF  
  DeleteIcon(); r/'!#7dLG-  
  CDialog::OnCancel(); |{kbc0*  
} lr~ |=}^  
"/e)v{  
void CCaptureDlg::OnAbout() ,zM@)Q ;9  
{ >dJuk6J&c&  
 CAboutDlg dlg; ~9FL]qo  
 dlg.DoModal(); R)JH D7 1  
} ub~ t}  
^.8~}TT-U  
void CCaptureDlg::OnBrowse() A1+:y,wXs  
{ A(E}2iP9=  
 CString str; nL=+`aq_  
 BROWSEINFO bi;  d=^QK{8  
 char name[MAX_PATH]; Pb?vi<ug+  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); :FI D ,  
 bi.hwndOwner=GetSafeHwnd(); F ><_gIT  
 bi.pszDisplayName=name; mN]WjfII  
 bi.lpszTitle="Select folder"; ;UTM9.o[  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Q&r. wV|  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); -fFtHw:kHh  
 if(idl==NULL) =h vPq@C%  
  return; A_S7z*T  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); gjG SI'M0B  
 str.ReleaseBuffer(); $3 -QM  
 m_Path=str; Anyy  
 if(str.GetAt(str.GetLength()-1)!='\\') r_$*euh@  
  m_Path+="\\"; @,.D]43  
 UpdateData(FALSE); _J6 Xq\  
} kh.P)h'9  
u:|^L]{  
void CCaptureDlg::SaveBmp() qH4|k 2Lm  
{ g&y (-  
 CDC dc; <A Hzs  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); R;Dj70g  
 CBitmap bm; %P s.r{%{  
 int Width=GetSystemMetrics(SM_CXSCREEN); ,M{G X  
 int Height=GetSystemMetrics(SM_CYSCREEN); g@!U^mr*3  
 bm.CreateCompatibleBitmap(&dc,Width,Height); <`pNdy4  
 CDC tdc; tcXXo&ZS  
 tdc.CreateCompatibleDC(&dc); MF<ZB_@  
 CBitmap*pOld=tdc.SelectObject(&bm); ]?1_.Wjtt  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ^PNDxtd|v  
 tdc.SelectObject(pOld); k5aB|xo  
 BITMAP btm; @z ",1^I  
 bm.GetBitmap(&btm); # tu>h  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; hQj@D\}  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); } uS0N$4  
 BITMAPINFOHEADER bih; N!~]D[D  
 bih.biBitCount=btm.bmBitsPixel; b_nE4>  
 bih.biClrImportant=0; 41Q 5%2  
 bih.biClrUsed=0; $L0sBW&  
 bih.biCompression=0; I m I$~q'  
 bih.biHeight=btm.bmHeight; q{9 \hEeb  
 bih.biPlanes=1; $?W2'Xm!V  
 bih.biSize=sizeof(BITMAPINFOHEADER); q}L`8(a  
 bih.biSizeImage=size; nX3?7"v  
 bih.biWidth=btm.bmWidth; ?lD)J?j  
 bih.biXPelsPerMeter=0; ;&CLb`<y  
 bih.biYPelsPerMeter=0; g?"QahH G  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 7!cLTq  
 static int filecount=0; \_,p@r]Q  
 CString name; TSewq4`K  
 name.Format("pict%04d.bmp",filecount++); kqih`E9P7B  
 name=m_Path+name; Skci;4T(  
 BITMAPFILEHEADER bfh; 1}la)lC  
 bfh.bfReserved1=bfh.bfReserved2=0; Y}R$RDRL  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 2 G_KTYJ  
 bfh.bfSize=54+size; xSD*e 0  
 bfh.bfOffBits=54; M;<!C%K>  
 CFile bf; (CIcM3|9C  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Wrb[\ ?-  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); y*^UGJC:  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }#D=Rf?2\P  
  bf.WriteHuge(lpData,size); }ZVond$y4  
  bf.Close(); b)'CP Cu*  
  nCount++; eg/itty  
 } ].xSX0YQ%  
 GlobalFreePtr(lpData); @;OsHudd  
 if(nCount==1) o]&q'>Rf  
  m_Number.Format("%d picture captured.",nCount); /jJD {  
 else *]U`]!Esp  
  m_Number.Format("%d pictures captured.",nCount); N\__a~'0p  
  UpdateData(FALSE); /5Qh*.(S  
} Qb?a[[3  
!gW`xVGv  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \;N+PE  
{ o+{,>t  
 if(pMsg -> message == WM_KEYDOWN) @ywtL8"1~  
 { Jfr'OD2$ %  
  if(pMsg -> wParam == VK_ESCAPE) WT,I~'r=S  
   return TRUE; bT 42G [x  
  if(pMsg -> wParam == VK_RETURN) n',X,P0  
   return TRUE; {H[N|\  
 } 7d>w]R,Z  
 return CDialog::PreTranslateMessage(pMsg); Ygk_gBRiC  
} R q@|o5O  
nm#23@uZ4K  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *:TwO=)  
{ 0,RYO :`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 5@>hjXi"Y  
  SaveBmp(); ?[ )}N _o#  
  return FALSE; r]cq|Nv8:  
} hOk9y=  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ,e'm@d$Q*  
 CMenu pop; z[J=WI  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); id9QfJ9t  
 CMenu*pMenu=pop.GetSubMenu(0); G3TS?u8Q  
 pMenu->SetDefaultItem(ID_EXITICON); dT'}:2  
 CPoint pt; *B!Ox}CI.L  
 GetCursorPos(&pt); w>f.@luO4  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 0=HB!{ @  
 if(id==ID_EXITICON) %HpPTjAW  
  DeleteIcon(); }:faHLYT  
 else if(id==ID_EXIT) N}U+K  
  OnCancel(); ]dGH i \  
 return FALSE; 0'*{BAWx  
} ]*| hd/j  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 9*I[q[>9  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) uQdH ():  
 AddIcon(); z{OL+-OY  
 return res; B(Yg1jAe  
} 4_-&PZ,d  
3LfF{ED@  
void CCaptureDlg::AddIcon() m]U  
{ KdozB!\  
 NOTIFYICONDATA data; qc,EazmU  
 data.cbSize=sizeof(NOTIFYICONDATA); xwsl$Rj  
 CString tip; agwbjkU/  
 tip.LoadString(IDS_ICONTIP); 7WmLC  
 data.hIcon=GetIcon(0); fpQFNV  
 data.hWnd=GetSafeHwnd(); wT!?.Y)aj  
 strcpy(data.szTip,tip); `uPO+2  
 data.uCallbackMessage=IDM_SHELL; xL_QTj  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; %TN$   
 data.uID=98; ."dT6uE  
 Shell_NotifyIcon(NIM_ADD,&data); OAq-(_H  
 ShowWindow(SW_HIDE); l=XZBe*[g'  
 bTray=TRUE; ?@@$)2_*u  
} F>{bVPh VA  
d>F7i~W  
void CCaptureDlg::DeleteIcon() X~VI}dJ  
{ =:g\I6'a  
 NOTIFYICONDATA data; =t_+ajY%  
 data.cbSize=sizeof(NOTIFYICONDATA); `m(ZX\W]  
 data.hWnd=GetSafeHwnd(); A94:(z;{  
 data.uID=98; Y_n/rD>  
 Shell_NotifyIcon(NIM_DELETE,&data); m_Hg!Lg  
 ShowWindow(SW_SHOW); ^jL)<y4`  
 SetForegroundWindow(); ?qsLR  
 ShowWindow(SW_SHOWNORMAL); hd'QMr[;  
 bTray=FALSE; _Ml?cT/J.O  
} ;C*2Djb*n  
,?m@Ko7Y  
void CCaptureDlg::OnChange() YC%x W*  
{ dl=)\mSFjF  
 RegisterHotkey(); fIpS P@$<  
} +arh/pd_I  
 j7_,V?5z  
BOOL CCaptureDlg::RegisterHotkey() r+%3Y:dZE  
{  =AaF$R  
 UpdateData(); JQbaD-  
 UCHAR mask=0; L>/$l(  
 UCHAR key=0; zZ-/S~l  
 if(m_bControl) aO1.9! <v  
  mask|=4; 8HLL3H0  
 if(m_bAlt) T$MXsq  
  mask|=2; ph b ;D  
 if(m_bShift) )OQm,5F1  
  mask|=1; Oi|cTZ@A-  
  key=Key_Table[m_Key.GetCurSel()]; 5w>TCx  
 if(bRegistered){ V$DB4YM1k  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ]E"J^mflGK  
  bRegistered=FALSE; |+8rYIms`  
 } rV"3oM]Lo  
 cMask=mask; ^[[@P(e>  
 cKey=key; -T+YMAFU_  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); uu]C;wl  
 return bRegistered; k2->Z);X  
} uYs45 G  
4V[(RXc/  
  四、小结 4mW$+lzn  
81#x/&E]  
  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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