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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: iM@$uD$_Q2  
  )O]6dd  
  一、实现方法 '{"Rjv7  
C`hdj/!A  
  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: eR$@Q  
LH5Z@*0#  
#pragma data_seg("shareddata") ECOJ .^  
HHOOK hHook =NULL; //钩子句柄 ~Q&J\'GQH  
UINT nHookCount =0; //挂接的程序数目 HU'Mi8xxy  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ob\-OMNs@  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 K6kz{R%`  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey hx9{?3#  
static int KeyCount =0; --WQr]U/  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 E+aePoU  
#pragma data_seg() S"cTi[9  
L}`/v]E"eU  
  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。 Am<5J,<uy  
xU.1GI%UPu  
  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: IMkE~0x4</  
}|.<EkA  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR |-Uh3WUE6  
cKey,UCHAR cMask) YNr"]SA@;  
{ B&]`OO>O  
 BOOL bAdded=FALSE; $fmTa02q>  
 for(int index=0;index<MAX_KEY;index++){ `,qft[1  
  if(hCallWnd[index]==0){ qYC&0`:H  
   hCallWnd[index]=hWnd; \baY+,Dr+  
   HotKey[index]=cKey; vqSpF6F q  
   HotKeyMask[index]=cMask; F\ B/q  
   bAdded=TRUE; z&6_}{2,]  
   KeyCount++; w:t~M[kTW  
   break; $*ff]>#  
  } 4j={ 9e<  
 } V4[-:k  
 return bAdded; !Y ,7%  
} x4WCAqi/2  
//删除热键 cUY-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) geme_  
{ eFG/!b<17  
 BOOL bRemoved=FALSE; n9B5D:.G  
 for(int index=0;index<MAX_KEY;index++){ fpR|+`k  
  if(hCallWnd[index]==hWnd){ :W.H#@'(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ rYb5#aT[  
    hCallWnd[index]=NULL; |J-X3`^\H  
    HotKey[index]=0; WC#6(H5t$  
    HotKeyMask[index]=0; V&*IZt&  
    bRemoved=TRUE; ,8e'<y  
    KeyCount--; .PB!1C.}@  
    break; o{PG& }K  
   } rfqwxr45h  
  } Pk;\^DRC  
 } `D4Wg<,9  
 return bRemoved; I L*B@E8  
} (/A.,8Ad  
I0m7;M7 P  
731Lz*IFg  
  DLL中的钩子函数如下: K!6T8^JH  
hY`<J]-'`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]3LLlXtK[  
{ ZSuoD$~k[  
 BOOL bProcessed=FALSE; TxJk.c  
 if(HC_ACTION==nCode) =\<NTu  
 { }9^:(ty2A  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 M& ZKc  
   switch(wParam) tu\XuDk y  
   {  #_DpiiS,.Q  
    case VK_MENU: wW%b~JX  
     MaskBits&=~ALTBIT; \D@j`o  
     break; ;/Hr ZhOE  
    case VK_CONTROL: )]fsl_Yq  
     MaskBits&=~CTRLBIT; 3Bl|~K;-  
     break; UD-+BUV  
    case VK_SHIFT: |{#St-!-7  
     MaskBits&=~SHIFTBIT; QLJ\>  
     break; ]64Pk9z=  
    default: //judge the key and send message tx09B)0  
     break; bBi>BP =  
   } %p 6Ms  
   for(int index=0;index<MAX_KEY;index++){ }b456J  
    if(hCallWnd[index]==NULL) %3`*)cp@  
     continue; t/[2{'R4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dcf,a<K\  
    { jr` swyg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !]F`qS>  
     bProcessed=TRUE; 7nB4(A2[S4  
    } b 7sfr!t_d  
   } W>jKWi,{  
  } HxO+JI`'3  
  else if((lParam&0xc000ffff)==1){ //有键按下 A?MM9Y}K  
   switch(wParam) JLd%rM\m  
   { nE]rPRU}[  
    case VK_MENU: #(tdJ<HvC|  
     MaskBits|=ALTBIT; z4YDngf=4  
     break; N3u06  
    case VK_CONTROL: /dCsZA  
     MaskBits|=CTRLBIT; ~cm4e>o  
     break; F$UL.`X _/  
    case VK_SHIFT: nvR%Ub x  
     MaskBits|=SHIFTBIT; OC&BJNOi  
     break; x// uF  
    default: //judge the key and send message f&vMv.  
     break; !KI^Z1dP(  
   } Tb] 7# v  
   for(int index=0;index<MAX_KEY;index++){ ;mpYcpI  
    if(hCallWnd[index]==NULL) a4s't% P  
     continue; ]!TE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bPTtA;u  
    { -|V#U`mwF  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); H,D5)1Uu  
     bProcessed=TRUE; _g Mr]%Q  
    } S<T 'B0r8  
   } KH2]:&6:Q  
  } 6w%n$tiX  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 `oMZ9Gq2E  
   for(int index=0;index<MAX_KEY;index++){ a j4ZS  
    if(hCallWnd[index]==NULL) "}X+vd``  
     continue; /4+L2O[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "nz\YQdg  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); r5gqRh}+  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 F > rr.  
   } .5\@G b.8  
  } UlWmf{1%]?  
 } >,,`7%Rv  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]WNY"B>+  
} jG ouwta  
~C{:G;Iy0  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: VP!4Nob  
,#XXwm ^I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >$ZhhM/} J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Tv#d>ZSD  
3/gR}\=  
  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: +X#6 d v$  
qb;b.P?~D$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) g{Av =66Z  
{ ASdW!4.p  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) =R:O`qdC4e  
 { >,Y+ 1  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 2=?3MXcjy  
  SaveBmp(); fln[Q2zl  
  return FALSE; e;v"d!H/  
 } U`[viH>K  
 …… //其它处理及默认处理 N4 x5!00  
} 8pEA3py  
A,&711Y  
[.&JQ  
  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。 5BA:^4zr?  
g(zeOS]q}  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 9qDM0'WuU  
RR=WD-l  
  二、编程步骤 bj`GGxzOb  
]-t>F  
  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"; kB?/_a`]  
Z;N3mD+\ye  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; .RmFYV0,  
sf$hsPC^  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 6*B%3\z)  
GPni%P#a@0  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 5`3 x(=b  
r?u4[ Oe#  
  5、 添加代码,编译运行程序。 ;i.MDW^N  
tQG'f*4  
三、程序代码 PCwc=  
N( 7(~D=)B  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5$!idfDr|m  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) wdt2T8`I/  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ?#a&eW  
#if _MSC_VER > 1000 Jqzw94  
#pragma once i\;ZEM{  
#endif // _MSC_VER > 1000 Y'000#+  
#ifndef __AFXWIN_H__ j|8!gW  
#error include 'stdafx.h' before including this file for PCH $S' TW3  
#endif Wtaz@ +  
#include "resource.h" // main symbols #)n$Q^9&  
class CHookApp : public CWinApp |11vm#  
{ ^>%.l'1/(  
 public: #9s)fR  
  CHookApp(); {Y/0BS2D  
  // Overrides i+5Qs-dHA  
  // ClassWizard generated virtual function overrides 6Br^Ugy  
  //{{AFX_VIRTUAL(CHookApp) N?t*4Y  
 public: pq]z%\$u  
  virtual BOOL InitInstance(); YFu>`w^Y  
  virtual int ExitInstance(); ]gX8z#*k  
  //}}AFX_VIRTUAL tJ_Y6oFm=  
  //{{AFX_MSG(CHookApp) O`Qke Z}  
  // NOTE - the ClassWizard will add and remove member functions here. T*@o?U  
  // DO NOT EDIT what you see in these blocks of generated code ! 02J(*_o  
  //}}AFX_MSG D?%[du:V  
  DECLARE_MESSAGE_MAP() B#hvw'}  
}; VMF?qT3Nd  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); v6DjNyg<x  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4pMp@ b  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  RSj8T<  
BOOL InitHotkey(); /tG as  
BOOL UnInit(); ;o)'dK  
#endif s]e `q4ip  
OYxYlUq  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Jw=7eay$F  
#include "stdafx.h" Y5 ;a  
#include "hook.h" k?HdW(HA  
#include <windowsx.h> E$z-|-{>  
#ifdef _DEBUG cQxUEY('+  
#define new DEBUG_NEW TDZ==<C  
#undef THIS_FILE Py #EjF12  
static char THIS_FILE[] = __FILE__; #-Mr3  
#endif ~$>JYJj  
#define MAX_KEY 100 a e-tAA[1Y  
#define CTRLBIT 0x04 Ohj^Z&j  
#define ALTBIT 0x02 b00$3,L   
#define SHIFTBIT 0x01 1p5'.~J+Q  
#pragma data_seg("shareddata") \: F$7 *Ne  
HHOOK hHook =NULL; &HLG<ISw  
UINT nHookCount =0; D1+1j:m  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey L|<j/bP  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT b 1.S21  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey zqrqbqK5R  
static int KeyCount =0; 8ZbXGQ  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 1!V[fPJ  
#pragma data_seg() 3n)Kzexh  
HINSTANCE hins; 8mmnnf{P  
void VerifyWindow(); 4".I*ij  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) r [^.\&-  
//{{AFX_MSG_MAP(CHookApp) ._>03,"  
// NOTE - the ClassWizard will add and remove mapping macros here. \VEnP=*:W  
// DO NOT EDIT what you see in these blocks of generated code! 9W(&g)`  
//}}AFX_MSG_MAP @D*PO-s9  
END_MESSAGE_MAP() ud(0}[  
w%TrL+v  
CHookApp::CHookApp() sZ&6g<8#y  
{ ts(u7CJd  
 // TODO: add construction code here, Gjq7@F'  
 // Place all significant initialization in InitInstance LCS.C(n,  
} '_7rooU9  
'Q=)-  
CHookApp theApp; {HM[ )t0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Jlb{1B$7  
{ EKcPJ\7  
 BOOL bProcessed=FALSE; b{-"GqMO  
 if(HC_ACTION==nCode) lb9?Uc@  
 { #J3}H   
  if((lParam&0xc0000000)==0xc0000000){// Key up 6ERMn"[_w  
   switch(wParam) 1yz%ud-l  
   { V:j^!*  
    case VK_MENU: E<tR8='F  
     MaskBits&=~ALTBIT; Eo ^m; p5  
     break; "(W;rl  
    case VK_CONTROL: ha;fxM]  
     MaskBits&=~CTRLBIT; +1yi{!j1  
     break; LKI\(%ba#  
    case VK_SHIFT: ,<K+.7,)E  
     MaskBits&=~SHIFTBIT; ZY7-.  
     break; %E#Ubm!  
    default: //judge the key and send message b==jlYa=  
     break; qov<@FvE0  
   } T=~d. &J  
   for(int index=0;index<MAX_KEY;index++){ /N%i6t<xU  
    if(hCallWnd[index]==NULL) l i?@BHEf  
     continue; + \%]<YO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ox<&T|  
    { 2G-"HOG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `WCL-OoZc5  
     bProcessed=TRUE; l=T;hk  
    } |.RyF@N`T  
   } aY,Bt  
  } jyF*JQjK4  
  else if((lParam&0xc000ffff)==1){ //Key down B_[I/ ?  
   switch(wParam) $ S3b<]B  
   { A p?,y?  
    case VK_MENU: JAjiG^]  
     MaskBits|=ALTBIT; ?kZ-,@h:  
     break; 3mYW]  
    case VK_CONTROL: `Rq|*:LV  
     MaskBits|=CTRLBIT; "XV@O jr E  
     break; (O(TFE5^  
    case VK_SHIFT: M0C)SU5"  
     MaskBits|=SHIFTBIT; _2`b$/)-  
     break; -Wmb M]Z  
    default: //judge the key and send message a%HNz_ro  
     break; b"#S92R+  
   } s&o9LdL  
   for(int index=0;index<MAX_KEY;index++) I:oEt  
   { Ebj0 {ZL  
    if(hCallWnd[index]==NULL) 1 Vc_jYO@  
     continue; ECM#J28D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =$bF[3D  
    { -le^ 5M7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); TlyBpG=p  
     bProcessed=TRUE; Y ~I>mc]  
    } \hI?XnL#  
   } 'xai5X  
  } 6J JA"] `  
  if(!bProcessed){ S}h d,"I  
   for(int index=0;index<MAX_KEY;index++){ 3  ;F  
    if(hCallWnd[index]==NULL) F[O147&C  
     continue; ,)d`_AD+5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ,KM%/;1Dm  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ` W );+s  
   } 0e#PN@  
  } /@ g 8MUq7  
 } eJ<P  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6rmx{Bt  
} z<!A;.iD  
r6Vw!^]8u8  
BOOL InitHotkey() ;aD~1;q  
{ \VIY[6sn\M  
 if(hHook!=NULL){ G8w@C  
  nHookCount++; mYJ8O$  
  return TRUE; uMG y-c  
 } jCtk3No  
 else 2P`./1L  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); BB3 a8  
  if(hHook!=NULL) oF+yh!~mM  
   nHookCount++; UJp'v_hN  
  return (hHook!=NULL); D?S|]]Y!q  
} c 8  
BOOL UnInit() &@|? %  
{ paN=I=:*M  
 if(nHookCount>1){ TBJ?8W(  
  nHookCount--; euT=]j  
  return TRUE; ?(B}w*G~  
 } "38<14V  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 6ZI7V!k  
 if(unhooked==TRUE){ O"TVxP:  
  nHookCount=0; S=V  
  hHook=NULL; Ufi#y<dP  
 } *UW 8|\;  
 return unhooked; ljrJC  
} 6=JJ!`"<2  
rmvrv.$3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ' ZTRl+  
{ +ru`Zw5,  
 BOOL bAdded=FALSE; b0h\l#6  
 for(int index=0;index<MAX_KEY;index++){ KgD$P(J:[  
  if(hCallWnd[index]==0){ H*0g*(  
   hCallWnd[index]=hWnd; +RpCh!KP  
   HotKey[index]=cKey; zCA8}](C^  
   HotKeyMask[index]=cMask; t xnH~;(  
   bAdded=TRUE; t'W6Fmwkx  
   KeyCount++; B[8 RBTsA  
   break; 7yg {0a  
  } &``nD  
 } ]P7gEBi  
 return bAdded; 5lzbg   
} B3[X{n$px  
:$yOic}y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ym ]g0a  
{ &e).l<B  
 BOOL bRemoved=FALSE; buzpmRoN)  
 for(int index=0;index<MAX_KEY;index++){ 'CqAjlj  
  if(hCallWnd[index]==hWnd){ k)F!gV#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ r/ATZAgHP  
    hCallWnd[index]=NULL; " @ ""  
    HotKey[index]=0; ^qC.bv]&  
    HotKeyMask[index]=0; 6OC4?#96%'  
    bRemoved=TRUE; sP@XV/`3L6  
    KeyCount--; 8aRmHy"9l  
    break; Bw`?zd\*  
   } lc fAb@}2  
  } (?XIhpd  
 } !7#*Wdt+P  
 return bRemoved; q |Pebe=  
} =w_T{V  
MxGQM>  
void VerifyWindow() a>8] +@  
{ d^IX(y*$  
 for(int i=0;i<MAX_KEY;i++){ v\!Cq+lFML  
  if(hCallWnd!=NULL){ Edh9=sxL  
   if(!IsWindow(hCallWnd)){ {nA+-=T  
    hCallWnd=NULL; ~KGE(o4p  
    HotKey=0; "k [$euV  
    HotKeyMask=0; Wx;%W"a  
    KeyCount--; p'@z}T?F  
   } :nnch?J_  
  } (1er?4  
 }  L=!h`k  
} ' t(#HBU  
*n@rPr-  
BOOL CHookApp::InitInstance() E:\#Ur2  
{ SU7,uxF  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); xK1w->[  
 hins=AfxGetInstanceHandle(); A~?)g!tS<  
 InitHotkey(); r_'];  
 return CWinApp::InitInstance(); 1T~`$zS7  
}  d*([!!i  
Td^62D;  
int CHookApp::ExitInstance() /-@F|,O)$n  
{ V~o'L#a  
 VerifyWindow(); #gf0*:p  
 UnInit(); D2MIV&pahP  
 return CWinApp::ExitInstance(); 9ucoQ@  
} $V<fJpA  
$'*{&/@  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file yQu/({D  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 98zJ?NaD&  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ UNrO$aX!1'  
#if _MSC_VER > 1000 ph2 _P[S'  
#pragma once Vn/FW?d7  
#endif // _MSC_VER > 1000 4uE/!dT  
>K%+h)%kI  
class CCaptureDlg : public CDialog Y3)*MqZlF  
{ Lq@uwiq!  
 // Construction Dg ~k"Ice  
 public: 65+2+p  
  BOOL bTray; "x_G6JE4tv  
  BOOL bRegistered; _a?x)3\v  
  BOOL RegisterHotkey(); G}WY0FC6  
  UCHAR cKey; %3HF_DNOY=  
  UCHAR cMask; $Zrc-tkV  
  void DeleteIcon(); YO@~y *,  
  void AddIcon(); K"Irg.  
  UINT nCount; G-o6~"J\  
  void SaveBmp(); G&6`?1k  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor /W}"/W9  
  // Dialog Data K7qR  
  //{{AFX_DATA(CCaptureDlg) 6k37RpgH  
  enum { IDD = IDD_CAPTURE_DIALOG }; Y|-&=  
  CComboBox m_Key; 8k Sb92  
  BOOL m_bControl; /(s N@kt  
  BOOL m_bAlt; O+Db#FW  
  BOOL m_bShift; a(`"qS  
  CString m_Path; ?FZ) LZM  
  CString m_Number; e]:(.Wb- 9  
  //}}AFX_DATA A4L.bBl  
  // ClassWizard generated virtual function overrides =G 'c%  
  //{{AFX_VIRTUAL(CCaptureDlg) <{eJbNp  
 public: %wJ>V-\e  
  virtual BOOL PreTranslateMessage(MSG* pMsg); N_0B[!B]  
 protected: shY8h   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1)-VlQK p  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); sk t9mU  
  //}}AFX_VIRTUAL e&<=+\ul  
  // Implementation v+d`J55  
 protected: 1:I _ ;O_  
  HICON m_hIcon; b^P\Kky  
  // Generated message map functions | gGD3H  
  //{{AFX_MSG(CCaptureDlg) xCu\jc)2  
  virtual BOOL OnInitDialog(); ~!Rf5QA85  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); b|.<rV'BTt  
  afx_msg void OnPaint(); B-$ps=G+z  
  afx_msg HCURSOR OnQueryDragIcon(); }qhND-9#@  
  virtual void OnCancel(); OR10IS  
  afx_msg void OnAbout(); "@xL9[d  
  afx_msg void OnBrowse(); *>lXCx  
  afx_msg void OnChange(); `7 Nk;  
 //}}AFX_MSG !,DA`Yt  
 DECLARE_MESSAGE_MAP() Qz<i{r-z  
}; jq/CXYv  
#endif JWxSN9.X  
ae+*gkPv8  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file J@q!N;eh|  
#include "stdafx.h" 5*y6{7FLp  
#include "Capture.h" A{Y/eG8  
#include "CaptureDlg.h" Ht~YSQ~:y  
#include <windowsx.h> A(JgAV1{  
#pragma comment(lib,"hook.lib") Qer}eg`R  
#ifdef _DEBUG gp^xl>E  
#define new DEBUG_NEW )Y=ti~?M(  
#undef THIS_FILE }A<fCm7  
static char THIS_FILE[] = __FILE__;  7"])Y  
#endif G/_8xmsU  
#define IDM_SHELL WM_USER+1 ]rO/IuB  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [5P1 pkZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &:=[\Ws R  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; //}KWz  
class CAboutDlg : public CDialog .`h:1FP 8  
{ +L=a\8Ep  
 public: pG$l   
  CAboutDlg(); xHn "D@  
  // Dialog Data g`H;~ w  
  //{{AFX_DATA(CAboutDlg) RWGAxq`9f  
  enum { IDD = IDD_ABOUTBOX }; 2&<&q J  
  //}}AFX_DATA 6?l|MU"Q.  
  // ClassWizard generated virtual function overrides ~:UAL}b{\~  
  //{{AFX_VIRTUAL(CAboutDlg) ~=Fp0l)#  
 protected: Rdy-6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support B,{Q[  
  //}}AFX_VIRTUAL [g lhru=+  
  // Implementation 3=^B &AB  
 protected: v *@R U  
  //{{AFX_MSG(CAboutDlg) kE{-h'xADD  
  //}}AFX_MSG idZ]d6  
  DECLARE_MESSAGE_MAP() %wmbFj}  
}; o5w =  
\r\wqz7  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) d((,R@N'  
{ %Q5 |RL D  
 //{{AFX_DATA_INIT(CAboutDlg) n_t.l<V  
 //}}AFX_DATA_INIT SKSI\]Cc  
} 4AN(4"$N  
ek0,@Vg9  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) IU rGJ#}O  
{ .!g  
 CDialog::DoDataExchange(pDX); TI637yqCU  
 //{{AFX_DATA_MAP(CAboutDlg) V_H0z  
 //}}AFX_DATA_MAP frbeCBP&)  
} k{+ Gv}Y  
m^1'aO_;q  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 9Qc=D"'  
 //{{AFX_MSG_MAP(CAboutDlg) ~qb-uT\(99  
 // No message handlers x /?w1  
 //}}AFX_MSG_MAP q>dERN&  
END_MESSAGE_MAP() I- WR6s=  
m)xz_Plc  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !;&{Q^}  
: CDialog(CCaptureDlg::IDD, pParent) MZ <BCRB  
{ (L7%V !  
 //{{AFX_DATA_INIT(CCaptureDlg) M}!E :bv'  
  m_bControl = FALSE; S>EO6z#   
  m_bAlt = FALSE; sKL"JA T  
  m_bShift = FALSE; @D=i|f  
  m_Path = _T("c:\\"); #j6qq3OG  
  m_Number = _T("0 picture captured."); x`zE#sD  
  nCount=0; kwpbgQ  
  bRegistered=FALSE; G/_9!lE  
  bTray=FALSE; 1(m[L=H5>  
 //}}AFX_DATA_INIT Nvj KB)J  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .^!uazPE0  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); s!j vBy  
} hXP'NS`iv  
o<i\1<eI  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) N5@l[F7I  
{ ey) 8q.5  
 CDialog::DoDataExchange(pDX); $ud\CU:r  
 //{{AFX_DATA_MAP(CCaptureDlg) (p}N cn.  
  DDX_Control(pDX, IDC_KEY, m_Key); N/eFwv.Er  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); n~v*  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Q`(h  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); jR mo9Bb2  
  DDX_Text(pDX, IDC_PATH, m_Path); \Qe`>nA  
  DDX_Text(pDX, IDC_NUMBER, m_Number); l=ZX9<3  
 //}}AFX_DATA_MAP JReJlDu  
} eRvnN>L  
};nOG;  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) vo]$[Cp|4  
//{{AFX_MSG_MAP(CCaptureDlg) }Uunlz<  
 ON_WM_SYSCOMMAND() Qon>[<]B  
 ON_WM_PAINT() HT=-mwa_]  
 ON_WM_QUERYDRAGICON() 2)+ddel<Z  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) bRK[u\,  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 0z=^_Fb  
 ON_BN_CLICKED(ID_CHANGE, OnChange) rn%q*_3-o  
//}}AFX_MSG_MAP WRfhxl  
END_MESSAGE_MAP() 3^p;'7x  
]ZM-c~nL  
BOOL CCaptureDlg::OnInitDialog() ./E<v  
{ u75(\<{  
 CDialog::OnInitDialog(); >iFi~)i_4y  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); `ouCQ]tKz  
 ASSERT(IDM_ABOUTBOX < 0xF000); Nd61ns(N  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 5TVA1  
 if (pSysMenu != NULL) jmh$6 N% F  
 { z)]Br1  
  CString strAboutMenu; 8z'_dfP=5  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ttA0* >'  
  if (!strAboutMenu.IsEmpty()) v[=TPfX0  
  { l*>, :y  
   pSysMenu->AppendMenu(MF_SEPARATOR); SOo}}a0  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); YV/JZc f  
  } Vh5Z'4N  
 } 2f7]= snCG  
 SetIcon(m_hIcon, TRUE); // Set big icon z Ud{9B$  
 SetIcon(m_hIcon, FALSE); // Set small icon z Feo8S  
 m_Key.SetCurSel(0); / WJ+e  
 RegisterHotkey(); PvqG5-L~W  
 CMenu* pMenu=GetSystemMenu(FALSE); " )/febBS  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Y8%*S%yO  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 0N4+6k|  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); m<| *  
 return TRUE; // return TRUE unless you set the focus to a control y?yWM8  
} G7d)X^q!xS  
KPMId`kf  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) cuo'V*nWQ  
{ ":,J<|Oy  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ok<!/"RX$  
 { a;[=b p  
  CAboutDlg dlgAbout; a<mM )[U  
  dlgAbout.DoModal(); \XT~5N6  
 } )0p7d:%mV  
 else dSw%Qv*y  
 { QPT%CW61M  
  CDialog::OnSysCommand(nID, lParam); :x/L.Bz  
 } n6s[q- td  
} =s$UU15  
xO2CgqEb  
void CCaptureDlg::OnPaint() g|PRk9  
{ x^P~+(g  
 if (IsIconic()) >'96SE3  
 { X*Cvh|  
  CPaintDC dc(this); // device context for painting xRPU GGv  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]J>{ZL   
  // Center icon in client rectangle `u7"s'  
  int cxIcon = GetSystemMetrics(SM_CXICON); iP^o]4[c  
  int cyIcon = GetSystemMetrics(SM_CYICON); \rY<DxtOq  
  CRect rect; K"U[OZC`  
  GetClientRect(&rect); @Zov&01  
  int x = (rect.Width() - cxIcon + 1) / 2; :Vl2\H=P  
  int y = (rect.Height() - cyIcon + 1) / 2; ;Alw`'  
  // Draw the icon EwH_k  
  dc.DrawIcon(x, y, m_hIcon); RYem(%jq  
 } Z/w "zCd  
 else 52>,JHq  
 { r&?i>.Kz8  
  CDialog::OnPaint(); ohj(1jt  
 } |B/A)(c yV  
} AEr8^6  
!$5.\D  
HCURSOR CCaptureDlg::OnQueryDragIcon() FF7  
{ Ua= w;h  
 return (HCURSOR) m_hIcon; !<I3^q  
} S@PAtB5  
t;e+WZkV  
void CCaptureDlg::OnCancel() T.kQ] h2ZG  
{ :Mq-4U.e  
 if(bTray) +9d]([Lx  
  DeleteIcon(); Y] "_}  
  CDialog::OnCancel(); ZAcH`r*  
} #Kd^t =k  
fKN&0N |^R  
void CCaptureDlg::OnAbout() :^oF0,-qZ  
{ KoL3CA"N  
 CAboutDlg dlg; ui$JQ_P  
 dlg.DoModal(); ?YTngIa  
} H^N 5yOj/  
^~Dmb2h  
void CCaptureDlg::OnBrowse() 5$w`m3>i(  
{ leSR2os  
 CString str; {D9m>B3"{  
 BROWSEINFO bi; ~KF>Jow?Y  
 char name[MAX_PATH]; BQTibd  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ;Q&|-`NK  
 bi.hwndOwner=GetSafeHwnd(); Y4.t:Uzr  
 bi.pszDisplayName=name; zPKx: I3  
 bi.lpszTitle="Select folder"; NiCB.a  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; !?u{2 D  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~gA p`Q  
 if(idl==NULL) ;mw$(ZKa#  
  return; _K5R?"H0  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); C+=8?u<  
 str.ReleaseBuffer(); gZLzE*NZ  
 m_Path=str; 9;*-y$@  
 if(str.GetAt(str.GetLength()-1)!='\\') jx7b$x]  
  m_Path+="\\"; :s5wFumD  
 UpdateData(FALSE); q;<=MO/  
} s v}o%  
-lNq.pp3-$  
void CCaptureDlg::SaveBmp() _R 6+bB$  
{ ?=\&O=_ln  
 CDC dc; bXw!fYm&  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); YAoGVey  
 CBitmap bm; 8:)W!tr  
 int Width=GetSystemMetrics(SM_CXSCREEN); <*4BT}r,^2  
 int Height=GetSystemMetrics(SM_CYSCREEN); }KZt7)  
 bm.CreateCompatibleBitmap(&dc,Width,Height); :g`j gn 0  
 CDC tdc; ~dFdO7  
 tdc.CreateCompatibleDC(&dc); CC<(V{Png  
 CBitmap*pOld=tdc.SelectObject(&bm); 6|-V{  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); WE|-zo  
 tdc.SelectObject(pOld); 'q_^28rK  
 BITMAP btm; S);SfNh%CL  
 bm.GetBitmap(&btm); (v'#~)R_`  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; RrG5`2  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &eqeQD6  
 BITMAPINFOHEADER bih; #S*`7MvM  
 bih.biBitCount=btm.bmBitsPixel; $k|:V&6SV  
 bih.biClrImportant=0; N#Y|MfLc  
 bih.biClrUsed=0; nbECEQ:|B  
 bih.biCompression=0; =>kE`"{!  
 bih.biHeight=btm.bmHeight; PqJB&:ZV  
 bih.biPlanes=1; `pfZJ+  
 bih.biSize=sizeof(BITMAPINFOHEADER); aGR!T{`   
 bih.biSizeImage=size; Q2L>P<87T  
 bih.biWidth=btm.bmWidth; 'wg>=|Q5  
 bih.biXPelsPerMeter=0; DNGXp5I  
 bih.biYPelsPerMeter=0; Q,f~7IVX  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); R iPxz=kr  
 static int filecount=0; z3bRV{{YqN  
 CString name; R|&Rq(ow"  
 name.Format("pict%04d.bmp",filecount++); [K=M; $iQ  
 name=m_Path+name; R'udC}  
 BITMAPFILEHEADER bfh; \Xr Sn_p-  
 bfh.bfReserved1=bfh.bfReserved2=0; a At<36{?  
 bfh.bfType=((WORD)('M'<< 8)|'B'); U_8 Z&  
 bfh.bfSize=54+size; 6Kbc:wlR  
 bfh.bfOffBits=54; bl8EzO  
 CFile bf; djk?;^8  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6VsgZ"Il  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); %lbDcEsf9  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); :"~SKJm  
  bf.WriteHuge(lpData,size); hp$/O4fD  
  bf.Close(); r+D ?_Lk  
  nCount++; 0'3f^Ajf  
 } 5p}ri,Y<  
 GlobalFreePtr(lpData); +}.~"  
 if(nCount==1) l@irA tg4  
  m_Number.Format("%d picture captured.",nCount); w!j'k|b>  
 else J2BCaAwEP,  
  m_Number.Format("%d pictures captured.",nCount); C+m%_6<  
  UpdateData(FALSE); (\8~W*ej"  
} @|2L>N  
UD!-.I]  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) dKk#j@[n"  
{ GGQ%/i]:  
 if(pMsg -> message == WM_KEYDOWN) X"k:+  
 { V`WSZ  
  if(pMsg -> wParam == VK_ESCAPE) Z0'&@P$  
   return TRUE; I,lX;~xb  
  if(pMsg -> wParam == VK_RETURN) LJc"T)>$`  
   return TRUE; JqmxS*_P  
 } \}n\cUy-  
 return CDialog::PreTranslateMessage(pMsg); p=jpk@RX  
} }mYxI^n  
s?5vJ:M Xr  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) )z^NJ'v4(  
{ Im g$D*BM  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ hE;|VSdo  
  SaveBmp(); BI|TM2oa  
  return FALSE; cSD$I^$oq  
} +7KRoF|  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ f|'0FI  
 CMenu pop; \V_ Tc`  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); (k^o[HF  
 CMenu*pMenu=pop.GetSubMenu(0); ib\_MNIb  
 pMenu->SetDefaultItem(ID_EXITICON); &E+mXEve  
 CPoint pt; ;TC"n!ew  
 GetCursorPos(&pt); QG=K^g  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); II'"Nkxd  
 if(id==ID_EXITICON) 9R m\@E [  
  DeleteIcon(); 67g"8R#.V  
 else if(id==ID_EXIT) FX1H2N(  
  OnCancel(); a_3w/9L4r  
 return FALSE; (uVL!%61k  
} FTQNS8  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); mz|p=[lR|  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) j>`-BN_  
 AddIcon(); ~Jh1$O,9o  
 return res; %#<MCiaK  
} *N&~Uq^  
sR4B/1'E  
void CCaptureDlg::AddIcon() o* ~aB_  
{ f}t8V% ^E  
 NOTIFYICONDATA data; < 2SWfH1>  
 data.cbSize=sizeof(NOTIFYICONDATA); g.*DlD%%  
 CString tip; M5kw3Jy5  
 tip.LoadString(IDS_ICONTIP); CUN1.i<pk8  
 data.hIcon=GetIcon(0); .]e_je_  
 data.hWnd=GetSafeHwnd(); .|e8v _2J  
 strcpy(data.szTip,tip); kW7$Gw]-  
 data.uCallbackMessage=IDM_SHELL; 4:9N]1JCb  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; mIZ6[ ?  
 data.uID=98; 1{A K=H')  
 Shell_NotifyIcon(NIM_ADD,&data); jx{wOb~oO)  
 ShowWindow(SW_HIDE); z*UgRLKZD  
 bTray=TRUE; )*XD"-9  
} v&qL r+_7  
IG Ax+3V  
void CCaptureDlg::DeleteIcon() }a%1$>sj  
{ GO)5R,  
 NOTIFYICONDATA data; $Jo4n>/  
 data.cbSize=sizeof(NOTIFYICONDATA); U,K=(I7OBX  
 data.hWnd=GetSafeHwnd(); &/n*>%2  
 data.uID=98; 1Ror1%Q"?  
 Shell_NotifyIcon(NIM_DELETE,&data);  i}_"  
 ShowWindow(SW_SHOW); neQ~h4U"  
 SetForegroundWindow(); [DZ|Ltv  
 ShowWindow(SW_SHOWNORMAL); @'9m()%-]g  
 bTray=FALSE; YsMM$rjP +  
} ?C`r3  
*XOLuPL>6)  
void CCaptureDlg::OnChange() X;1yQ |su  
{ 8'"=y}]H~  
 RegisterHotkey(); tZG l^mA"g  
} N%F4ug@i   
P1R5}i  
BOOL CCaptureDlg::RegisterHotkey() 2){O&8A  
{ PJ YUD5  
 UpdateData(); \U3v5|Q  
 UCHAR mask=0; ?<` ;lu/eL  
 UCHAR key=0; ~F^tLi!5  
 if(m_bControl) M1icj~Jr  
  mask|=4; !zfKj0^  
 if(m_bAlt) ed2r<H$  
  mask|=2; !QpOrg  
 if(m_bShift) }xry  
  mask|=1; NBL%5!'  
  key=Key_Table[m_Key.GetCurSel()]; H:)_;k  
 if(bRegistered){ npd:aGx  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 15S&,$ 1&  
  bRegistered=FALSE; y 2)W"PuG  
 } 6e8 gFQ"w2  
 cMask=mask; f92z/5%V  
 cKey=key; TlowEh8r  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); &1Cs'  
 return bRegistered; ,+ 5:}hR+  
} d'"|Qg_'  
U\u07^h[  
  四、小结 ez5J+  
B Dp")[l  
  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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