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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: 2aN<w'pA  
  I=DxRgt  
  一、实现方法 _-TA{21)  
.;7> y7$*  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: E:`v+S_h  
%@"!8Y(j  
#pragma data_seg("shareddata") {a(&J6$VE  
HHOOK hHook =NULL; //钩子句柄 "&.S&=FlI  
UINT nHookCount =0; //挂接的程序数目 Dnf*7)X  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 LOy0hN-$b  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ZraT3  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey rjx6Djo>  
static int KeyCount =0; a>O9pX  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 4LH[4Yj?`  
#pragma data_seg() e4>"92hX  
*J|(jdu7  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 <[:o !$  
?:{sH#ua  
  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: RDqFL.-S  
tCG76LH  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR t"072a  
cKey,UCHAR cMask) a|7a_s4(  
{ 1BHG'y  
 BOOL bAdded=FALSE; 2 {Vcb  
 for(int index=0;index<MAX_KEY;index++){ M$4[)6Y  
  if(hCallWnd[index]==0){ }Z-Z|G)#  
   hCallWnd[index]=hWnd; pCh2SQ(Q>  
   HotKey[index]=cKey; -s|8<A||"  
   HotKeyMask[index]=cMask; ]i<[d ,  
   bAdded=TRUE; KnhoaBB  
   KeyCount++; e=vsuqGT  
   break; eB> s=}|  
  } ew _-Eb  
 } $d S@y+  
 return bAdded; zq+o+o>xo  
} 9^FziM  
//删除热键 5irwz4.4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) QqNW}: #  
{ c9qR'2  
 BOOL bRemoved=FALSE; $$APgj"|<  
 for(int index=0;index<MAX_KEY;index++){ HB+|WW t>  
  if(hCallWnd[index]==hWnd){ EtbnE*S  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ xL|;VyD  
    hCallWnd[index]=NULL; S"Lx%  
    HotKey[index]=0; j>uj=B@  
    HotKeyMask[index]=0; osARA3\Xt  
    bRemoved=TRUE; c~QS9)=E  
    KeyCount--; =OIw*L8C"I  
    break;  qy)_wM  
   } ;9o;r)9~  
  } -HSs^dP`  
 } g_5QA)4x  
 return bRemoved; gz2\H}  
} o8e?J\?  
n1 6 `y}  
n Ox4<Wk&  
  DLL中的钩子函数如下: nJ4pTOc  
=K'cM=WM6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) QrO\jAZ{Ag  
{ {7TlN.(  
 BOOL bProcessed=FALSE; -7J|l  
 if(HC_ACTION==nCode) 2(5ebe[  
 { qTZFPfyU  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 n  -(  
   switch(wParam) Hbv6_H  
   {  qW:HNEiir  
    case VK_MENU: T91moRv  
     MaskBits&=~ALTBIT; K\"R&{+=  
     break; u:0aM}9A  
    case VK_CONTROL: lL1k.& |5m  
     MaskBits&=~CTRLBIT; pym!U@$t  
     break; F}Vr:~  
    case VK_SHIFT: 2'=T[<nNB  
     MaskBits&=~SHIFTBIT; ifN64`AhRX  
     break; uqz]J$  
    default: //judge the key and send message s0Z uWVip  
     break; X7k.zlH7T  
   } @(r /dZc  
   for(int index=0;index<MAX_KEY;index++){  hI9  
    if(hCallWnd[index]==NULL) __mF ?m  
     continue; (/35p g6\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @gY)8xMbA  
    { 4pw6bK,s2\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); q6YXM  
     bProcessed=TRUE; quY:pqG38q  
    } MSf;ZB  
   } eX@L3BKp  
  } F:x [  
  else if((lParam&0xc000ffff)==1){ //有键按下 n; {76Q  
   switch(wParam) ;a:[8Yi  
   { tcxcup%  
    case VK_MENU: 6@DF  
     MaskBits|=ALTBIT; %^RN#_ro(3  
     break; ]_N|L|]M  
    case VK_CONTROL: ER,1(1]N  
     MaskBits|=CTRLBIT; vWAL^?HUP  
     break; d!eYqM7-G  
    case VK_SHIFT: "DYJ21Ut4  
     MaskBits|=SHIFTBIT; U&O: _>~  
     break; N-lkYL-%\j  
    default: //judge the key and send message sr8cYLm5R  
     break; ]U"94S U:)  
   } 8OgLn?"P  
   for(int index=0;index<MAX_KEY;index++){ !47n[Zs  
    if(hCallWnd[index]==NULL) <[w=TdCPs  
     continue; #%DE;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -Uml_/rd_  
    { *}P~P$q%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Gz .|]:1  
     bProcessed=TRUE; ;*MLRXq  
    } 21"1NJzP  
   } eJg8,7WC  
  } t5 G9!Nn  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 X&kp;W  
   for(int index=0;index<MAX_KEY;index++){ j]`PSl+w  
    if(hCallWnd[index]==NULL) 1I:+MBGin  
     continue; O%bEB g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) vN;mP d~g  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); EFz&N\2  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 eA<0$Gs,h  
   } !KUi\yQ1  
  } ~@}Bi@*  
 } eio 4k-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); B {>7-0  
} rW$[DdFA5{  
s0vDHkf8  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: \-g)T}g,I  
.mR8q+I6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <7~'; K  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); A}l3cP; `#  
WPQ fhr#|  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: a |X a3E  
s7F.sg  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4t=G   
{ PUUwv_  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) wRVUu)  
 { uA< n  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 RCpR3iC2  
  SaveBmp(); 4%4 }5UYN  
  return FALSE; ~sh`r{0  
 } `EaLGzw  
 …… //其它处理及默认处理 }~L.qG  
} s%W C/ZK  
')cMiX\v  
9iQq.$A.  
  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。 F%RRd/'  
|!4K!_y  
  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。 1eF3`  
.6Pw|xu`Pw  
  二、编程步骤 5?x>9C a  
wfH^<jY)E  
  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"; I`!<9OTBj  
6^`1\ #f  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; F'21jy&  
K|[*t~59  
  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; jWA(C; W  
'd9INz.  
  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; %#kg#@z_`e  
%lGl,me H  
  5、 添加代码,编译运行程序。 t7aefV&_,  
HMNLa*CL'  
三、程序代码 cPlZXf  
H*PSR  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ;{N!Eb`S  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) fumm<:<CLO  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 5j?3a1l0  
#if _MSC_VER > 1000 yd d7I&$  
#pragma once \XZ/v*d0  
#endif // _MSC_VER > 1000 "~|6tQLc  
#ifndef __AFXWIN_H__ gi1^3R[  
#error include 'stdafx.h' before including this file for PCH .[ICx  
#endif RMdk:YvBg  
#include "resource.h" // main symbols Hquc o  
class CHookApp : public CWinApp `r9!zffyS  
{ Hx?;fl'G%  
 public: X aMJDa|M  
  CHookApp(); 3`DQo%<  
  // Overrides g,!L$,/F  
  // ClassWizard generated virtual function overrides VAHh~Q6 ;e  
  //{{AFX_VIRTUAL(CHookApp) w9EOC$|Y  
 public: H&-zZc4\  
  virtual BOOL InitInstance(); &i6),{QN  
  virtual int ExitInstance(); zBzZxK>$  
  //}}AFX_VIRTUAL yb\_zE\  
  //{{AFX_MSG(CHookApp) n-tgX?1'  
  // NOTE - the ClassWizard will add and remove member functions here. Yi.N&&o  
  // DO NOT EDIT what you see in these blocks of generated code ! +V{kb<P  
  //}}AFX_MSG *nkoPVpC  
  DECLARE_MESSAGE_MAP() $Nhs1st*8  
}; inMA:x}cF1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); +~ P2C6@G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -(;26\lE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); n{ar gI8wF  
BOOL InitHotkey(); -&zZtDd F  
BOOL UnInit(); rlOAo`hd  
#endif Rl?_^dPx  
f.KN-f8<F  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. YJT&{jYi  
#include "stdafx.h" j8 ^Iz  
#include "hook.h" 2K/4Rf0;  
#include <windowsx.h> m[~y@7AK<  
#ifdef _DEBUG mn"G_I  
#define new DEBUG_NEW 8e1UmM[  
#undef THIS_FILE 3YOq2pW72G  
static char THIS_FILE[] = __FILE__; "*e$aTZB\  
#endif qN9(S:_Px  
#define MAX_KEY 100 -=)H{  
#define CTRLBIT 0x04 }C"%p8=HM  
#define ALTBIT 0x02 NJWA3zz   
#define SHIFTBIT 0x01 ?BeiY zg  
#pragma data_seg("shareddata") .ypL=~Rp  
HHOOK hHook =NULL; ^@s1Z7  
UINT nHookCount =0; Ot_]3:`J~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 6]WAUK%h  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT |\pj;XU  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey h+g_rvIG*  
static int KeyCount =0; t%/&c::(6  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift JcsHt;  
#pragma data_seg() Z&+ g;(g  
HINSTANCE hins; ctZ uA+  
void VerifyWindow(); FrGgga$  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) m$>H u@Va  
//{{AFX_MSG_MAP(CHookApp) Rq'S>#e  
// NOTE - the ClassWizard will add and remove mapping macros here. PR#exm&  
// DO NOT EDIT what you see in these blocks of generated code! +>6iYUa  
//}}AFX_MSG_MAP gwuI-d^  
END_MESSAGE_MAP() >* f-Wde  
pP&7rRhw  
CHookApp::CHookApp() O:;w3u7;u  
{ c_$=-Khk  
 // TODO: add construction code here, -P$PAg5"2  
 // Place all significant initialization in InitInstance %rL.|q9  
} NX*Q F+  
O`IQ(,yef  
CHookApp theApp; )-I { ^(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [Kg+^N% +  
{ pZ.ecZe/  
 BOOL bProcessed=FALSE; NvceYKp:  
 if(HC_ACTION==nCode) S6Q  
 { -">;-3,K  
  if((lParam&0xc0000000)==0xc0000000){// Key up u5`u>.!  
   switch(wParam) -:+|zF@f  
   { 6jD=F ^jw  
    case VK_MENU: r= `Jn6@  
     MaskBits&=~ALTBIT; oGnSPI5KGC  
     break; w e//|fA<  
    case VK_CONTROL: cJ= 6r :  
     MaskBits&=~CTRLBIT; $f <(NM6?  
     break; ]nn98y+  
    case VK_SHIFT: %D{6[8  
     MaskBits&=~SHIFTBIT; i &nSh ]KK  
     break; ]g3JZF-  
    default: //judge the key and send message BO?%'\  
     break; zZPO&akB"  
   } nV|EQs4(  
   for(int index=0;index<MAX_KEY;index++){ o q Xg  
    if(hCallWnd[index]==NULL) {3mRq"e  
     continue; EHJ.T~X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ( Y[Q,  
    { :D5Rlfj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); L\J;J%fz.  
     bProcessed=TRUE;  ,f%S'(>w  
    } ~g]Vw4pv  
   } I3L<[-ZE  
  } zFfr. g;L  
  else if((lParam&0xc000ffff)==1){ //Key down 8b& /k8i:  
   switch(wParam) VPJElRSH  
   { w,.TTTad  
    case VK_MENU: n:?a$Ldgm  
     MaskBits|=ALTBIT; Qz1E 2yJ  
     break; UcHJR"M~c  
    case VK_CONTROL:  R B  
     MaskBits|=CTRLBIT; |mfvr *7  
     break; -$ls(oot  
    case VK_SHIFT: 4SxX3Fw  
     MaskBits|=SHIFTBIT; q"lSZ; 'E  
     break; -=Q*Ml#I  
    default: //judge the key and send message +5*95-;0  
     break; 9s q  
   } V~3a!-m\  
   for(int index=0;index<MAX_KEY;index++) s2V:cMXFn  
   { L,/%f<wd  
    if(hCallWnd[index]==NULL) .W%)*&WH\  
     continue; b{&)6M)zo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M'O <h  
    { ?dg [:1R}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %YscBG  
     bProcessed=TRUE; Czu9o;xr  
    } 194)QeoFw  
   } CY5Z{qiX  
  } ITI)soa~  
  if(!bProcessed){ A}9`S6@@  
   for(int index=0;index<MAX_KEY;index++){ )*J^K?!S  
    if(hCallWnd[index]==NULL) 0v?"t OT!  
     continue; %J?xRv!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Q(?#'<.#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); JX;G<lev  
   } FDs>m #e  
  } aeJHMHFc  
 } YK'<NE3 4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); z>Y-fN`,  
} r q].UCj  
BX7kO0j  
BOOL InitHotkey() D/&o& G96  
{ T.BW H2gRP  
 if(hHook!=NULL){ zTSTEOP}%Y  
  nHookCount++; 6%_nZvRv  
  return TRUE; UB@+c k  
 } .t!x<B  
 else +I|vzz`ZVr  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); KkbDW3-  
  if(hHook!=NULL) b]#AI qt  
   nHookCount++; hL{KRRf>  
  return (hHook!=NULL); tS=(}2Q  
} 7`'Tbp  
BOOL UnInit() "<1{9  
{ /(*q}R3Kfo  
 if(nHookCount>1){ }&J q}j  
  nHookCount--; :crW9+  
  return TRUE; FvjPdN/L?R  
 } dR,fXQm  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 29.h91  
 if(unhooked==TRUE){ @RKryY)  
  nHookCount=0; z Rr*7G  
  hHook=NULL; #)O6 5GI  
 } aX'*pK/-  
 return unhooked; sDlO#  
} %P|/A+Mg"  
Z@!+v 19^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) mz0X3  
{ /nA{#HY  
 BOOL bAdded=FALSE; YNF k  
 for(int index=0;index<MAX_KEY;index++){ BW4J>{  
  if(hCallWnd[index]==0){ htF] W|z  
   hCallWnd[index]=hWnd; ggR.4&<  
   HotKey[index]=cKey; gjDHo$  
   HotKeyMask[index]=cMask; HIZe0%WPw  
   bAdded=TRUE; 2^ nxoye  
   KeyCount++; !Wnb|=j  
   break; ](8[}CeL  
  } '5$b-x6F  
 } >|UOz&  
 return bAdded; j A%u 5V  
} 2FJ*f/  
^<2p~h0 \  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) LZY"3Jn[nQ  
{ lt8|9"9<  
 BOOL bRemoved=FALSE; @Jw-8Q{  
 for(int index=0;index<MAX_KEY;index++){ SE  %pw9  
  if(hCallWnd[index]==hWnd){ kt:! 7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ YIYmiv5  
    hCallWnd[index]=NULL; EaN6^S=  
    HotKey[index]=0; s2'h  
    HotKeyMask[index]=0; -[.[>&`/  
    bRemoved=TRUE; u'BaKWPS  
    KeyCount--; 4|?;TE5  
    break; 1=V-V<  
   } h2d(?vOT  
  } xwo<' xT  
 } MQ8J<A Pf-  
 return bRemoved; $ddCTS^  
} $xN|5;+  
}5"u[Z.  
void VerifyWindow() "4{r6[dn  
{ UJ   
 for(int i=0;i<MAX_KEY;i++){ k{-Cwo  
  if(hCallWnd!=NULL){ vEJbA  
   if(!IsWindow(hCallWnd)){ Q*Pq{]0K  
    hCallWnd=NULL; 9\7en%(M  
    HotKey=0; cbTm'}R(G  
    HotKeyMask=0; i9x+A/ o[  
    KeyCount--; /j.9$H'y  
   } >4CbwwMA  
  } _oeS Uzq.  
 } gg2( 5FPP  
} w\O;!1iU  
4o[{>gW  
BOOL CHookApp::InitInstance() sfl<qD+?  
{ \'O"~W  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); )Pv%#P-<  
 hins=AfxGetInstanceHandle(); o`-msz  
 InitHotkey(); 6Z"X}L,*  
 return CWinApp::InitInstance(); 0o&5 ]lEe  
} $IpccZpA  
A.w.rVDD  
int CHookApp::ExitInstance() 6D3B^.r j]  
{ X"%gQ.1|{j  
 VerifyWindow(); yJIscwF  
 UnInit(); o }m3y  
 return CWinApp::ExitInstance(); vnuN6M{  
} 5v*\Zr5ha  
nX8v+:&}  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file CU!Dhm/U  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) b&U62iq  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ c7H^$_^=  
#if _MSC_VER > 1000 } 0y"F  
#pragma once |`FY1NN   
#endif // _MSC_VER > 1000 KMax$  
t%8BK>AHvw  
class CCaptureDlg : public CDialog G 01ON0  
{ A,!-{/wc  
 // Construction G' 1'/  
 public: J#83 0r(-  
  BOOL bTray; cFXp  
  BOOL bRegistered; [dz _R  
  BOOL RegisterHotkey(); B%68\  
  UCHAR cKey; I7 ]8Y=xf  
  UCHAR cMask; N?8!3&TiV  
  void DeleteIcon(); f _:A0  
  void AddIcon(); Zv{'MIv&v  
  UINT nCount; n `Ac 3A  
  void SaveBmp(); #KvlYZ+1  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor M<&= S  
  // Dialog Data ;$Jo+#  
  //{{AFX_DATA(CCaptureDlg) {P-):  
  enum { IDD = IDD_CAPTURE_DIALOG }; 1|=A*T-<M  
  CComboBox m_Key; |Y.?_lC  
  BOOL m_bControl; :Zlwy-[  
  BOOL m_bAlt; 0=$T\(0g  
  BOOL m_bShift; 'Pbr v  
  CString m_Path; #5uOx(>  
  CString m_Number; uXiN~j &Be  
  //}}AFX_DATA #O&8A  
  // ClassWizard generated virtual function overrides uQzXfOq  
  //{{AFX_VIRTUAL(CCaptureDlg) /x *3}oI  
 public: \w8\1~#  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 7d\QB (~  
 protected: K (|}dl:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @O~pV`_tD  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); nJ;.Td  
  //}}AFX_VIRTUAL .6J$,.Ig  
  // Implementation cWm$;`Q#\  
 protected: # f\rt   
  HICON m_hIcon; FP>2C9:d  
  // Generated message map functions %z$#6?OK^  
  //{{AFX_MSG(CCaptureDlg) 5bb(/YtFy  
  virtual BOOL OnInitDialog(); cZ3v=ke^  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2fS:- 8N  
  afx_msg void OnPaint(); vih9 KBT  
  afx_msg HCURSOR OnQueryDragIcon(); ~VB1OLgv#.  
  virtual void OnCancel(); Dt1jW  
  afx_msg void OnAbout(); 4I[P>  
  afx_msg void OnBrowse(); B<C&xDRZ0  
  afx_msg void OnChange(); \{D" !e  
 //}}AFX_MSG bI`g|v  
 DECLARE_MESSAGE_MAP() 2Khv>#l  
}; 6S{l' !s'  
#endif  Fk;Rfqq  
ugBCBr  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file HVAYPerH  
#include "stdafx.h" _u Il  
#include "Capture.h" ;FEqe 49  
#include "CaptureDlg.h" pK4)yu+  
#include <windowsx.h> K)P%;X  
#pragma comment(lib,"hook.lib") Tj- s4x  
#ifdef _DEBUG O".=r}  
#define new DEBUG_NEW QsW/X0YBv  
#undef THIS_FILE Fj!U|l\_9  
static char THIS_FILE[] = __FILE__; H;"4 C8K7  
#endif !`r$"}g  
#define IDM_SHELL WM_USER+1 ajpX L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8?C5L8)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w2'5#`m  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 5-A\9UC*@  
class CAboutDlg : public CDialog & nK<:^n  
{ ./~(7o$  
 public: *K; ~!P  
  CAboutDlg(); I`#JwMU;m  
  // Dialog Data J~- 4C)  
  //{{AFX_DATA(CAboutDlg)  AOx[  
  enum { IDD = IDD_ABOUTBOX }; S8gs-gL#Og  
  //}}AFX_DATA d d;T-wa}  
  // ClassWizard generated virtual function overrides Xnh8e  
  //{{AFX_VIRTUAL(CAboutDlg) ##ANrG l  
 protected: i@'dH3-kO  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support P93@;{c(  
  //}}AFX_VIRTUAL K> e7pu  
  // Implementation ;n},"&  
 protected: sR8"3b<qA  
  //{{AFX_MSG(CAboutDlg) 3 gf1ownC  
  //}}AFX_MSG |f##5fB  
  DECLARE_MESSAGE_MAP() % u6Sr5A[s  
}; b`_Q8 J  
paMa+jhQQ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) FgO)DQm  
{ _vZOZKS+  
 //{{AFX_DATA_INIT(CAboutDlg) LgYq.>Nl9  
 //}}AFX_DATA_INIT [00m/fT6  
} ,+ ~W4<f  
%XTI-B/K  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) x)VJFuqy  
{ =\d?'dII:  
 CDialog::DoDataExchange(pDX); Xm&L B X  
 //{{AFX_DATA_MAP(CAboutDlg) \`"ht  
 //}}AFX_DATA_MAP Ap !lQ>p  
} w*Ihk)  
"7`<~>9t.  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) .|=\z9_7S8  
 //{{AFX_MSG_MAP(CAboutDlg) E} .^kc[(4  
 // No message handlers . ]M"# \  
 //}}AFX_MSG_MAP 92-I~ !d  
END_MESSAGE_MAP() w#J2 wS  
A)KZa"EX  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) |K~Nw&rZ]  
: CDialog(CCaptureDlg::IDD, pParent) N uI9iU  
{ QCJM&  
 //{{AFX_DATA_INIT(CCaptureDlg) oXS}IL og'  
  m_bControl = FALSE; DL.!G  
  m_bAlt = FALSE; ?1".;foZ  
  m_bShift = FALSE; _XT pU  
  m_Path = _T("c:\\"); /7LR;>Bj  
  m_Number = _T("0 picture captured."); ET >](l9  
  nCount=0; uIrG*K  
  bRegistered=FALSE; |&jXp%4T  
  bTray=FALSE; .8|X   
 //}}AFX_DATA_INIT t:c.LFrF  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 /L#?zSt  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); mcok/,/  
} L8n|m!MOD  
lRdChoL$2  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 6zn5UW#q  
{ _aMF?Pj~m  
 CDialog::DoDataExchange(pDX); GJUL$9  
 //{{AFX_DATA_MAP(CCaptureDlg) FgI3   
  DDX_Control(pDX, IDC_KEY, m_Key); jq-_4}w?C  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ?hM64jI|  
  DDX_Check(pDX, IDC_ALT, m_bAlt); (I}v[W  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); j~QwV='S  
  DDX_Text(pDX, IDC_PATH, m_Path); Qei" '~1a  
  DDX_Text(pDX, IDC_NUMBER, m_Number); { "E\Jcjl\  
 //}}AFX_DATA_MAP R GX=)  
} c"xK`%e  
UZ$/Ni  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) E!AE4B1bd  
//{{AFX_MSG_MAP(CCaptureDlg) k+4#!.HX^  
 ON_WM_SYSCOMMAND() Cls%M5MH  
 ON_WM_PAINT() 07$o;W@  
 ON_WM_QUERYDRAGICON() xwty<?dRW1  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) |)G<,FJQE_  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) R FH0  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 2px|_)i  
//}}AFX_MSG_MAP t0I{q0  
END_MESSAGE_MAP() =rK+eG#,  
>OK^D+v"j  
BOOL CCaptureDlg::OnInitDialog() 8.~kK<)!  
{  yOKI*.}  
 CDialog::OnInitDialog(); abEmRJTmW  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); -!9G0h&i|  
 ASSERT(IDM_ABOUTBOX < 0xF000); [trwBZ^D~  
 CMenu* pSysMenu = GetSystemMenu(FALSE); bJ;'`sw1  
 if (pSysMenu != NULL) ;UP$yM;  
 { UY 2OZ& &  
  CString strAboutMenu; 2Hv+W-6v  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Tac$LS\Q  
  if (!strAboutMenu.IsEmpty()) m#F`] {  
  { 9)=ctoZ'  
   pSysMenu->AppendMenu(MF_SEPARATOR); ei{eTp4HpV  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);  f V(J|  
  } YnP5i#"  
 } cs'{5!i]  
 SetIcon(m_hIcon, TRUE); // Set big icon d`6 ' Z  
 SetIcon(m_hIcon, FALSE); // Set small icon V470C@  
 m_Key.SetCurSel(0); +t;7tQDVB  
 RegisterHotkey(); Xs?o{]Fe  
 CMenu* pMenu=GetSystemMenu(FALSE); D#)b+7N-  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); E+JqWR5  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); tRfo$4#NY  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 1!gbTeVlY  
 return TRUE; // return TRUE unless you set the focus to a control S Z$Kz n  
} *WT`o>  
>dG[G>  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 7\q~%lDE  
{ 6MkP |vr6  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ;w[0t}dPl  
 { OydwE  
  CAboutDlg dlgAbout; #C3.Jef  
  dlgAbout.DoModal(); -D$8  
 } m9Hit8f@Q  
 else #1G:lhkC  
 { ""|Qtubv  
  CDialog::OnSysCommand(nID, lParam); ?K\axf>F  
 } ZQ0F$J)2~  
} :08,JL{  
}Z,x~G  
void CCaptureDlg::OnPaint() IB7E}56l  
{ # Vha7  
 if (IsIconic()) Qz N&>sk"  
 { .VzT:4-<Q"  
  CPaintDC dc(this); // device context for painting 1y4  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); <A'$%`6m  
  // Center icon in client rectangle 0_t`%l=  
  int cxIcon = GetSystemMetrics(SM_CXICON); 8*T=Xei8  
  int cyIcon = GetSystemMetrics(SM_CYICON); *`RkTc G  
  CRect rect; `^y7f  
  GetClientRect(&rect);  ][h}  
  int x = (rect.Width() - cxIcon + 1) / 2; ( ICd}  
  int y = (rect.Height() - cyIcon + 1) / 2; \;"=QmRD%:  
  // Draw the icon }U9G    
  dc.DrawIcon(x, y, m_hIcon); \} :PLCKT  
 } *=7U4W  
 else ,nB5/Lx  
 { tC9n k5~  
  CDialog::OnPaint(); Oo% d]8W  
 } 3kMf!VL  
} cpJ|w3x B  
ilx)*Y  
HCURSOR CCaptureDlg::OnQueryDragIcon() t1y4 7fX6  
{ )TH@# 1  
 return (HCURSOR) m_hIcon; 0=E]cQwh  
} 0s2v'A[\  
`^Em&6!!  
void CCaptureDlg::OnCancel() <yFu*(Q  
{ X*Prll(  
 if(bTray)  'CkIz"Wd  
  DeleteIcon(); H}bJ"(9$vC  
  CDialog::OnCancel(); v-_e)m^  
} vOpK Np  
7s{GbU\  
void CCaptureDlg::OnAbout() <<R*2b  
{ kq,ucU%>p  
 CAboutDlg dlg; KNIn:K^/  
 dlg.DoModal(); 5,6"&vU,  
} [ ~&/s:Vvo  
ah+iZ}E%  
void CCaptureDlg::OnBrowse() wx0j(:B]  
{ X*@dj_,  
 CString str; xx%j.zDI]  
 BROWSEINFO bi; o$lM$E:  
 char name[MAX_PATH]; b 7?hI  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 8C9-_Ng`  
 bi.hwndOwner=GetSafeHwnd(); DX K?Cv71z  
 bi.pszDisplayName=name; <;Zmjeb+#  
 bi.lpszTitle="Select folder"; (rm?jDm   
 bi.ulFlags=BIF_RETURNONLYFSDIRS; I75DUJqy]  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); &AbNWtCV+G  
 if(idl==NULL) *.d)OOpLo  
  return; \Et3|Iv  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); oHn Ky[1  
 str.ReleaseBuffer(); U0N 60  
 m_Path=str; SmSH2m-  
 if(str.GetAt(str.GetLength()-1)!='\\') e [mm  
  m_Path+="\\"; 6.nCV 0xA  
 UpdateData(FALSE); FSW_<%  
} <+vw@M  
+Kbjzh3<wG  
void CCaptureDlg::SaveBmp() iVq'r4S  
{ f5VLw`m}.8  
 CDC dc; y''z5['  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); XBu"-(  
 CBitmap bm; &H/'rd0M  
 int Width=GetSystemMetrics(SM_CXSCREEN); S8j{V5R'  
 int Height=GetSystemMetrics(SM_CYSCREEN); GM f `A,>  
 bm.CreateCompatibleBitmap(&dc,Width,Height); T&u5ki4NE  
 CDC tdc; z !rL s76  
 tdc.CreateCompatibleDC(&dc); *kDCliL  
 CBitmap*pOld=tdc.SelectObject(&bm); Cl8Cg~2  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); fN^8{w/O  
 tdc.SelectObject(pOld); \B,@`dw  
 BITMAP btm; P%&0]FCx  
 bm.GetBitmap(&btm); >rKIG~P_  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; !0LWa"  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); My[pr_xg  
 BITMAPINFOHEADER bih; ;LSANr&  
 bih.biBitCount=btm.bmBitsPixel; MPg)=LI  
 bih.biClrImportant=0; c>:wd@w  
 bih.biClrUsed=0; 9} M?P  
 bih.biCompression=0; Hp!-248S  
 bih.biHeight=btm.bmHeight; k],Q9  
 bih.biPlanes=1; rgtT~$S  
 bih.biSize=sizeof(BITMAPINFOHEADER); =BAW[%1b  
 bih.biSizeImage=size; ryUQU^v  
 bih.biWidth=btm.bmWidth; ,,Q O^j]4~  
 bih.biXPelsPerMeter=0; peuZ&yK+"  
 bih.biYPelsPerMeter=0; 'UX!*5k<:  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [H^z-6x:0  
 static int filecount=0; 9oR@U W1  
 CString name; ^sEYOX\  
 name.Format("pict%04d.bmp",filecount++); PB`Y g  
 name=m_Path+name; jrr*!^4|  
 BITMAPFILEHEADER bfh; Mhf5bN|wQ  
 bfh.bfReserved1=bfh.bfReserved2=0; &n}f?  
 bfh.bfType=((WORD)('M'<< 8)|'B'); qCpp6~]Um  
 bfh.bfSize=54+size; }1i`6`y1  
 bfh.bfOffBits=54; VfC<WVYiZ  
 CFile bf; &zeyE;/Hj  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ][h%UrV  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); _w+:Dv~*a  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ?u=Fj_N_  
  bf.WriteHuge(lpData,size); j8{i#;s!"  
  bf.Close(); qqr?!vem6  
  nCount++; f:|1_j  
 } 6J6BF%  
 GlobalFreePtr(lpData); J76kkW`5  
 if(nCount==1) QIvVcfM^  
  m_Number.Format("%d picture captured.",nCount); {e9@-  
 else JZ*/,|1}EC  
  m_Number.Format("%d pictures captured.",nCount); BmMGx8P  
  UpdateData(FALSE); 6x[}g  
} L<-_1!wh  
FvXZ<(A{  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \[_t]'p  
{ a /l)qB#  
 if(pMsg -> message == WM_KEYDOWN) {9;CNsd  
 { >#~& -3  
  if(pMsg -> wParam == VK_ESCAPE) _w(7u(Z  
   return TRUE; R0]1xGz  
  if(pMsg -> wParam == VK_RETURN) (\hx` Yh=>  
   return TRUE; 7#ibN!  
 } q#ClnG*  
 return CDialog::PreTranslateMessage(pMsg); Ou!2 [oe@M  
} X0H!/SlS  
{V$|3m>:*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Qu"\wE^.`  
{ }c`"_L  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ #Z`q+@@ ]A  
  SaveBmp(); AFDq}*2Qb  
  return FALSE; i6tf2oqO7  
} o_Z5@F  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ K&ZtRRDd  
 CMenu pop; mPN@{.(j  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); i,E{f  
 CMenu*pMenu=pop.GetSubMenu(0); w QH<gJE/:  
 pMenu->SetDefaultItem(ID_EXITICON); rc>4vB_ha  
 CPoint pt; K>r,(zgVc  
 GetCursorPos(&pt); )=Z>#iH1  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ]J}  
 if(id==ID_EXITICON) 3kIN~/<R+7  
  DeleteIcon(); +N9X/QFKV  
 else if(id==ID_EXIT) ?{|q5n  
  OnCancel(); \y)rt )  
 return FALSE; w\}ieI8J  
} |\<`Ib4j  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); THbh%)Zv+  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) '()xHEGl3  
 AddIcon(); }=UHbU.n~!  
 return res; ?'Xj g#}<  
} F2dHH^  
ogtEAv~e7N  
void CCaptureDlg::AddIcon() M7a.8-!1  
{ m!4ndO;0vh  
 NOTIFYICONDATA data; fc%xS7&  
 data.cbSize=sizeof(NOTIFYICONDATA); uK#4(eY=W  
 CString tip; dTC7Fm  
 tip.LoadString(IDS_ICONTIP); Y. 5_6'Eo?  
 data.hIcon=GetIcon(0); gsv uE  
 data.hWnd=GetSafeHwnd(); a 3b/e8c  
 strcpy(data.szTip,tip); goRL1L,5  
 data.uCallbackMessage=IDM_SHELL; f/NH:1)y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; |`Ntv }  
 data.uID=98;  |`f$tj  
 Shell_NotifyIcon(NIM_ADD,&data); Z!#!Gu*V  
 ShowWindow(SW_HIDE); 1onM j  
 bTray=TRUE; z8~NZ;A  
} \oXpi$  
+p_CN*10H  
void CCaptureDlg::DeleteIcon() pb?c$n$u*  
{ `PdQX.wN  
 NOTIFYICONDATA data; NP#w +Qw  
 data.cbSize=sizeof(NOTIFYICONDATA); /k6MzFoid  
 data.hWnd=GetSafeHwnd(); *{@Nq=fE  
 data.uID=98;  u\x}8pn  
 Shell_NotifyIcon(NIM_DELETE,&data); P*Uwg&Qz)  
 ShowWindow(SW_SHOW); OwUhdiG  
 SetForegroundWindow(); }bpQq6ZF  
 ShowWindow(SW_SHOWNORMAL); +L| ?~p`V  
 bTray=FALSE; M~#gRAUJ  
} Xe'x[(l  
bv9]\qC]T<  
void CCaptureDlg::OnChange() p2[n$61   
{ _476pZ_  
 RegisterHotkey(); N/'b$m5= S  
} swoQ'  
BB$>h}  
BOOL CCaptureDlg::RegisterHotkey() d>&,9c%  
{ #m<nAR  
 UpdateData(); kr5">"7  
 UCHAR mask=0; VimE@Hz  
 UCHAR key=0; He/8=$c%  
 if(m_bControl) qu6D 5t  
  mask|=4; 7qLpZ/  
 if(m_bAlt) C12Fl  
  mask|=2; Nw/  ku  
 if(m_bShift) eKLZt%=  
  mask|=1; `$<.pOm  
  key=Key_Table[m_Key.GetCurSel()]; |'8Nh  
 if(bRegistered){ Nk 8B_{  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask);  O67W&nz  
  bRegistered=FALSE; mPK:R^RjG&  
 } o>i4CCU+  
 cMask=mask; B6As,)RjD:  
 cKey=key; 4*#18<u5  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); H8zK$!  
 return bRegistered; V)-+Fd,=  
} m6K}|j  
'$IKtM`L  
  四、小结 _LUhZlw  
\0I_<  
  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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