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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: `n&:\Ib  
  1Q@]b_"Xh  
  一、实现方法 ]-gyXE1.r  
z0[@O)Sj  
  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: ggD T5hb  
bRvGetX  
#pragma data_seg("shareddata") @&\Y:aRO%i  
HHOOK hHook =NULL; //钩子句柄 K<P d.:  
UINT nHookCount =0; //挂接的程序数目 QFP9"FM5F  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 H )ej]DXy  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ACyK#5E  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey wI@87&  
static int KeyCount =0; @R&d<^I&M  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 'AA9F$Dz  
#pragma data_seg() atyvo0fNd  
4!dc/K  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 XPdmz!,b  
kqBZsfF  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: U3_${  
-8l<5g7  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Qx)b4~F?  
cKey,UCHAR cMask) *(9Tl]w  
{ GLsa]}m,9  
 BOOL bAdded=FALSE; 3E*|^*  
 for(int index=0;index<MAX_KEY;index++){ (=j;rfvP  
  if(hCallWnd[index]==0){ b~aM=71  
   hCallWnd[index]=hWnd; ](Fey0@  
   HotKey[index]=cKey; %,\JTN|g|A  
   HotKeyMask[index]=cMask; J ?o  
   bAdded=TRUE;  qb? <u  
   KeyCount++; ! I:N<  
   break; kX8C'D4 gX  
  } ZJ3g,dc  
 } -#ZvjEaey  
 return bAdded; PYCN3s#Gi  
} sh :$J[  
//删除热键 M=iTwK  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @j|E"VYY  
{ &5 "!  0  
 BOOL bRemoved=FALSE; 3^/w`(-{@  
 for(int index=0;index<MAX_KEY;index++){ >V6t L;+  
  if(hCallWnd[index]==hWnd){ }Ulxt:}   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _[HZ[9c!  
    hCallWnd[index]=NULL; L-|l$Ti"  
    HotKey[index]=0; @:>]jp}uq  
    HotKeyMask[index]=0; 0:V /z3?  
    bRemoved=TRUE; \V-N~_-H  
    KeyCount--; l5D)UO  
    break; 5f*_K6,v  
   } D40 vCax^J  
  } 3"x_Y  
 } OHndZ$'fI  
 return bRemoved; 4\n ~  
} >ai,6!  
*L^W[o  
L$5,RUy  
  DLL中的钩子函数如下: 6q^$}eOt  
A|ZT ;\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) JX&U?Z  
{ WFF?VBT'^  
 BOOL bProcessed=FALSE; 3m>YR-n$  
 if(HC_ACTION==nCode) 7${<u0((!  
 { # 55>?  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 i(.e=  
   switch(wParam) D /QLp3+o  
   {  h4]^~stI  
    case VK_MENU: 8 W  
     MaskBits&=~ALTBIT; fS8Pi,!  
     break; s/3sOb}sA  
    case VK_CONTROL: 1o_Zw.  
     MaskBits&=~CTRLBIT; !K=$Q Uq  
     break; pvWj)4e  
    case VK_SHIFT: t"~X6o|R  
     MaskBits&=~SHIFTBIT; 1 K^-tms  
     break; )-iUUak  
    default: //judge the key and send message 5,O:"3>c  
     break; ZOppec1D  
   } 9qzHy}A  
   for(int index=0;index<MAX_KEY;index++){ A;^{%S  
    if(hCallWnd[index]==NULL) _ Fk^lDI-  
     continue; F7=\*U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) b; vVlIG  
    { YXF^4||j.c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >$3 =yw%  
     bProcessed=TRUE; uVX,[%*P  
    } |<1A<fU8a  
   } uTl"4;&j  
  } ,Cy&tRjR B  
  else if((lParam&0xc000ffff)==1){ //有键按下 m<;MOS  
   switch(wParam) ulEtZ#O{_  
   { 3+ C;zDKa  
    case VK_MENU: VVuNU"-  
     MaskBits|=ALTBIT; f*m^x7  
     break; QD-Bt=S7l  
    case VK_CONTROL: { q&`B  
     MaskBits|=CTRLBIT; 6aAN8wO;b  
     break; $fPiR  
    case VK_SHIFT: 3EA_-?  
     MaskBits|=SHIFTBIT; Oz xiT +  
     break; !QqVJ a{j  
    default: //judge the key and send message od!s5f!  
     break; QY\'Uu{  
   } qM>Dt  
   for(int index=0;index<MAX_KEY;index++){ W3X;c*j  
    if(hCallWnd[index]==NULL) or)fx/%h  
     continue; |\C.il7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y'}c$*OkI  
    { :4\_upRE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); h7xgLe@  
     bProcessed=TRUE; h-m0Ro?6  
    } y#O/Xw  
   } r $LU$F  
  } Fv nf;']q  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 |^w&dj\,  
   for(int index=0;index<MAX_KEY;index++){ `"xzC $  
    if(hCallWnd[index]==NULL) '81Rwp  
     continue; t?;=\%^<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) sI#h&V,9  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); IpKI6[2{`f  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 p@?(m/m$  
   } &Ci_wDJ  
  } {-|El}.M  
 } _JKz5hSl  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <rU+{&FKNL  
} X&i" K'mV  
20Rm|CNH?  
  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: ZS&lXgo  
nXh<+7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f\:I1y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Z#GR)jb+  
\x_$Pu  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: {PL,3EBG  
On+0@hh  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) B]>rcjD  
{ Xs2B:`,hh  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) k$,y1hH;f8  
 { `y1,VY  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 @d ^MaXp_P  
  SaveBmp(); x ;]em9b  
  return FALSE; YIl,8! z~  
 } %!L*ec%,  
 …… //其它处理及默认处理 OJ7y  
} ?xE'i[F @  
GlT/JZ9  
S2=x,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。 <1U *{y  
Hxj8cX UF|  
  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。 /\pUA!G)BD  
)VG_Y9;Xk:  
  二、编程步骤 H .sfM   
hSk  
  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"; od3b,Q  
pTYV@5|  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Q0""wR q'  
2bpFQ8q  
  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; 7. eiM!7g  
h{PJ4U{W  
  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; [} %=& B  
0B5d$0  
  5、 添加代码,编译运行程序。 ]mi)x6 3^  
^;EwZwH[  
三、程序代码 DH4|lb}  
FJB /tg  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ~HBx5Cpi  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) )U2%kmt  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Z1DF)  
#if _MSC_VER > 1000 &Qv%~dvW  
#pragma once sDy~<$l?  
#endif // _MSC_VER > 1000 cdfnM%`>\  
#ifndef __AFXWIN_H__ SsIN@  
#error include 'stdafx.h' before including this file for PCH mZ#IP  
#endif NV3oJ0f&2  
#include "resource.h" // main symbols uq]E^#^  
class CHookApp : public CWinApp .zdmUS :  
{ Uetna!ABB  
 public: &$pA,Gjin\  
  CHookApp(); DJH,#re>  
  // Overrides ,j[1!*Z_[  
  // ClassWizard generated virtual function overrides 5S #6{Y =  
  //{{AFX_VIRTUAL(CHookApp) p/jAr+XM  
 public: N*Xl0m(Q  
  virtual BOOL InitInstance(); bj+foNvu\  
  virtual int ExitInstance(); tkhEjTZ  
  //}}AFX_VIRTUAL mp0! S  
  //{{AFX_MSG(CHookApp)  #U/L8  
  // NOTE - the ClassWizard will add and remove member functions here. I]N!cEr;@-  
  // DO NOT EDIT what you see in these blocks of generated code ! Eqt>_n8  
  //}}AFX_MSG  bzX/Zts  
  DECLARE_MESSAGE_MAP() V5d|Lpm  
}; 5{M$m&$1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); <Ow+LJWQK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A:,V)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Um I,?p  
BOOL InitHotkey(); boIFN;Aq"  
BOOL UnInit(); 2}#VB;B  
#endif ! 9=Y(rb  
6E:5w9_=c  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. r Ww.(l  
#include "stdafx.h" izr 3{y5  
#include "hook.h" X#u< 3<P  
#include <windowsx.h> 2H`;?#Uq:  
#ifdef _DEBUG vb k4  
#define new DEBUG_NEW :j% B(@b  
#undef THIS_FILE g+u5u\k  
static char THIS_FILE[] = __FILE__; KU;m.{  
#endif unkA%x{W;  
#define MAX_KEY 100 X0%BE!  
#define CTRLBIT 0x04 Z-z(SKL  
#define ALTBIT 0x02 &d[%  
#define SHIFTBIT 0x01 3+:uV  
#pragma data_seg("shareddata") ltXGm)+  
HHOOK hHook =NULL; =D?{d{JT  
UINT nHookCount =0; wEbO|S+K1  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey v|YJ2q?19  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 7o`pNcabtz  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey PAy7b7m~B  
static int KeyCount =0; .h;X5q1  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift <p8>"~ R  
#pragma data_seg() (I(k$g[>  
HINSTANCE hins; Y@V6/D} 1  
void VerifyWindow(); uBBW2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) \AB*C_Ri  
//{{AFX_MSG_MAP(CHookApp) ;Q%3WD  
// NOTE - the ClassWizard will add and remove mapping macros here. I6F $@  
// DO NOT EDIT what you see in these blocks of generated code! R2nDK7j  
//}}AFX_MSG_MAP uWerC?da  
END_MESSAGE_MAP() ,koG*sn  
l`RFi)u~&  
CHookApp::CHookApp() :<E\&6# oC  
{ ZUeA&&{  
 // TODO: add construction code here, f n\&%`U  
 // Place all significant initialization in InitInstance ~Uaz;<"j0  
} bR|1* <  
<fcw:Ae  
CHookApp theApp; xT3l>9i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Dlu]4n[LB  
{ /pnQKy.  
 BOOL bProcessed=FALSE; zH?&FtO  
 if(HC_ACTION==nCode) \G &q[8F\  
 { 9 kS;_(DB  
  if((lParam&0xc0000000)==0xc0000000){// Key up -;o`(3wZq  
   switch(wParam) oJ)v6"j  
   { wi-{&  
    case VK_MENU: qt#4i.Iu+  
     MaskBits&=~ALTBIT; %p.hwgvnp  
     break; tM{U6k  
    case VK_CONTROL: -`e`U%n  
     MaskBits&=~CTRLBIT; [$(/H;  
     break; >CPoeIHK  
    case VK_SHIFT: Pr^p ^s  
     MaskBits&=~SHIFTBIT; ~m@w p  
     break; jp QmKX  
    default: //judge the key and send message TGQDt|+Z  
     break; ;Ajy54}7  
   } N&+DhKw  
   for(int index=0;index<MAX_KEY;index++){ mnWbV\VY  
    if(hCallWnd[index]==NULL) W/| C  
     continue; @V# wYt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lIF*$#`oh*  
    { {uMqd-Uu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); FUU/=)^P$  
     bProcessed=TRUE; J*CfG;Y:  
    } 5mYI5~ p  
   } wa4(tM2  
  } ]gGCy '*)  
  else if((lParam&0xc000ffff)==1){ //Key down $5m_)]w4a  
   switch(wParam) jF%[.n[BU  
   { LC:bHM, e  
    case VK_MENU: M 4TFWOC1  
     MaskBits|=ALTBIT; W&(98}oT  
     break; rSfvHO:R  
    case VK_CONTROL: O1K~]Nt  
     MaskBits|=CTRLBIT; )Y+?)=~  
     break; hV4B?##O  
    case VK_SHIFT: .Qeml4(`3  
     MaskBits|=SHIFTBIT; )|zna{g\  
     break; #5.L%F  
    default: //judge the key and send message :,(ZMx\  
     break; d[.JEgU  
   } (KxL*gB  
   for(int index=0;index<MAX_KEY;index++) 0Ku%9wh-  
   { V2?&3Z) W  
    if(hCallWnd[index]==NULL) xd`!z`X!,s  
     continue; !56gJJ-r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R]{AJ"p  
    { NQ(}rr'.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); tcxs%yWO1  
     bProcessed=TRUE; S4Vv _k-&  
    } ku}I; k |  
   } l6Q75i)eF  
  } #GHLF  
  if(!bProcessed){ ]xIfgSq  
   for(int index=0;index<MAX_KEY;index++){ [#R<Z+c  
    if(hCallWnd[index]==NULL) %L9A6%gr  
     continue; (^Kcyag4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) D;0xROW8{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :{v:sK  
   } rpT{0 >5  
  } UMJ>6 Ko8  
 } KGm"-W  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); W<D(M.61A  
} 7+I2" Hy  
{E~ MqrX  
BOOL InitHotkey() pQ Y.MZSA  
{ }3Y3f).ZW  
 if(hHook!=NULL){ q:1_D>  
  nHookCount++; z!I(B^)BkT  
  return TRUE; 5Y8/ZW~D0  
 } R]Q4+  
 else 5PQs1B  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); =Jx,.|Bf  
  if(hHook!=NULL) 1=t\|Th-  
   nHookCount++; ZkJYPXdn?  
  return (hHook!=NULL); jF\J+:5M  
} I!;#Nk>  
BOOL UnInit() ,e ~@  
{ yv<0fQ  
 if(nHookCount>1){  o2ndnIL  
  nHookCount--;  -'|pt,)  
  return TRUE; :>[;XT<  
 } 5)yQrS !{:  
 BOOL unhooked = UnhookWindowsHookEx(hHook); sQS2U6  
 if(unhooked==TRUE){ ~4mgYzOmD`  
  nHookCount=0; .#;;pu7W  
  hHook=NULL; fodr1M4J  
 } f#p.=F$  
 return unhooked; M9@#W"  
} M#qZ0JT4  
*S.2p*Vd  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) P~0d'Oi  
{ O>Nop5#o  
 BOOL bAdded=FALSE; kgz2/,  
 for(int index=0;index<MAX_KEY;index++){ ?6 "F.\ O@  
  if(hCallWnd[index]==0){ %Iv0<oU  
   hCallWnd[index]=hWnd; URW'*\Xjb  
   HotKey[index]=cKey; .Wq`q F(;  
   HotKeyMask[index]=cMask; qu[x=LZ_  
   bAdded=TRUE; ,diV;d  
   KeyCount++; e6f!6a+%  
   break; i%W,Y8\uf*  
  } Q H%{r4  
 } !o 7uZC\  
 return bAdded; +mP3 y~|-j  
} eP3)8QC  
d%9r"=/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NdQXQa?,  
{ H3.WAg[`  
 BOOL bRemoved=FALSE; $2^V#GWo  
 for(int index=0;index<MAX_KEY;index++){ ujcNSX*  
  if(hCallWnd[index]==hWnd){ PL8eM]XS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 'B"kUh%3$5  
    hCallWnd[index]=NULL; g2hxWf"  
    HotKey[index]=0; 3Lq?Y7#KQp  
    HotKeyMask[index]=0; =ot`V; Q>  
    bRemoved=TRUE; [pmZ0/l  
    KeyCount--; P,O9On  
    break; KW.S)+<H&  
   } s&lZxnIjc  
  } '8>#`Yba  
 } T"Wq:  
 return bRemoved; )*^PMf  
}  -[a0\H  
`ge{KB;*n#  
void VerifyWindow() r! 5C3  
{ CD^_>sya  
 for(int i=0;i<MAX_KEY;i++){ _SC>EP8:Z  
  if(hCallWnd!=NULL){ R$*{@U  
   if(!IsWindow(hCallWnd)){ WZCX&ui  
    hCallWnd=NULL; { >Y<!  
    HotKey=0; =?57*=]0M  
    HotKeyMask=0; >;QkV6i7  
    KeyCount--; -)?~5Z   
   } u9>.x zYG  
  } "wxs  
 } q]5"V>D \  
} FI~)ZhE)]  
QHsS|\u  
BOOL CHookApp::InitInstance() jjz<V(Sk  
{ "31GC7  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ,KIa+&vJW@  
 hins=AfxGetInstanceHandle(); 0ldde&!p  
 InitHotkey(); g?i_10Xlp  
 return CWinApp::InitInstance(); `a2Oj@jP  
} 0sq/_S  
&^4W+I{H  
int CHookApp::ExitInstance() /,= wP)  
{ sj`9O-?49  
 VerifyWindow(); (>>pla^  
 UnInit(); .dp~%!"Sn,  
 return CWinApp::ExitInstance(); x-Z`^O  
} :%A1k2  
C|W_j&S65  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $Kb-mFR  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 788q<7E  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ,+*8 @>c  
#if _MSC_VER > 1000  tB[(o%k  
#pragma once d+ih]?  
#endif // _MSC_VER > 1000 !?ayZ5G([  
#joU}Rj|  
class CCaptureDlg : public CDialog u3 ?+Hu|*T  
{ $&k2m^R<  
 // Construction Z[AJat@H  
 public: E] t:_v  
  BOOL bTray; J(M0t~RZ  
  BOOL bRegistered; ez86+  
  BOOL RegisterHotkey(); T[<llh'+  
  UCHAR cKey; bR*T}w$<  
  UCHAR cMask; $z{HNY* 2  
  void DeleteIcon(); $}OU~d1q  
  void AddIcon(); N(}7M~m>  
  UINT nCount; &N*S   
  void SaveBmp(); 0wZLkU_(  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor D Z ~|yH  
  // Dialog Data 5HL JkOV5  
  //{{AFX_DATA(CCaptureDlg)  h:#  
  enum { IDD = IDD_CAPTURE_DIALOG }; .rG Rdb  
  CComboBox m_Key; Ua V9T:)x  
  BOOL m_bControl; Nf0b?jn-  
  BOOL m_bAlt; /n?5J`6  
  BOOL m_bShift; **-%5 ~  
  CString m_Path; ?$;_a%v6  
  CString m_Number; w>H!H6Q  
  //}}AFX_DATA \ fU{$  
  // ClassWizard generated virtual function overrides x7Ly,  
  //{{AFX_VIRTUAL(CCaptureDlg) zmf5!77  
 public: A>OL5TCl  
  virtual BOOL PreTranslateMessage(MSG* pMsg); xJ>hN@5}i  
 protected: c 2?(.UV  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support '_r|L1  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); YcRjbF,|6  
  //}}AFX_VIRTUAL 5:CC\!&QBV  
  // Implementation 9qwVBu ;  
 protected: -1S+fUkiK/  
  HICON m_hIcon; wXXv0OzK  
  // Generated message map functions Xj+1]KRN  
  //{{AFX_MSG(CCaptureDlg) |mk$W$h  
  virtual BOOL OnInitDialog(); j=dHgnVvj  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); PM=I  
  afx_msg void OnPaint(); )J~Q x-jG  
  afx_msg HCURSOR OnQueryDragIcon(); I^M3>}p  
  virtual void OnCancel(); } %S1OQC  
  afx_msg void OnAbout(); A[ /0on5r  
  afx_msg void OnBrowse(); '4dnC2a]  
  afx_msg void OnChange(); $hndb+6q  
 //}}AFX_MSG HQ@X"y n  
 DECLARE_MESSAGE_MAP() gl.P#7X  
}; 9S&6u1  
#endif Mk|h ><Q"  
'$1-A%e$1  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file F2oY_mA  
#include "stdafx.h" &E {/s  
#include "Capture.h" 6$)Yqg`X  
#include "CaptureDlg.h" i]hFiX  
#include <windowsx.h> wOHK dQ'  
#pragma comment(lib,"hook.lib") wc~a}0uz  
#ifdef _DEBUG I.y|AQB  
#define new DEBUG_NEW e#kPf 'gL  
#undef THIS_FILE E;VW6[M  
static char THIS_FILE[] = __FILE__; ]4uIb+(S  
#endif rI; e!EW  
#define IDM_SHELL WM_USER+1 Ez<J+#)t  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `$nMTx]Y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l:z :tJ#(  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; iL/(WAB_od  
class CAboutDlg : public CDialog HP3~.1Sp  
{ ~SUA.YuF  
 public: 0u'4kF!P!  
  CAboutDlg(); 'R*xg2!i  
  // Dialog Data n AoGG0$5  
  //{{AFX_DATA(CAboutDlg) \&&kUpI  
  enum { IDD = IDD_ABOUTBOX }; 6IctW5b  
  //}}AFX_DATA QKwWX_3%Z]  
  // ClassWizard generated virtual function overrides J= ia  
  //{{AFX_VIRTUAL(CAboutDlg) x +q"%9.c  
 protected: 5l=B,%s  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pyT+ba#  
  //}}AFX_VIRTUAL Z, lUO.  
  // Implementation ":Kn@S'{(  
 protected: {,]BqFXv  
  //{{AFX_MSG(CAboutDlg) MN$j{+!Q  
  //}}AFX_MSG fB3O zff  
  DECLARE_MESSAGE_MAP() X']>b   
}; _-o*3gmbQ  
 +h9U V  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) +&4PGv53J  
{ E,c~.jYc  
 //{{AFX_DATA_INIT(CAboutDlg) f8#WT$Ewy  
 //}}AFX_DATA_INIT 6!n"E@Bwu  
} L`R,4mI.W  
CbQ@l@d]  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) b v\V>s  
{ xGk@BA=0<  
 CDialog::DoDataExchange(pDX); n{r+t=X  
 //{{AFX_DATA_MAP(CAboutDlg) %,K|v  
 //}}AFX_DATA_MAP V~Tjz%<  
} W ;P1T"*A  
' uo`-Y  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) u5H#(&Om  
 //{{AFX_MSG_MAP(CAboutDlg) }<2F]UuR  
 // No message handlers ![7v_l\Q  
 //}}AFX_MSG_MAP 6zRJ5uI,/  
END_MESSAGE_MAP() YUT"A{L  
,h #!!j\j6  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) W#u}d2mP  
: CDialog(CCaptureDlg::IDD, pParent) T55l-.>  
{ @Sq=#f/=  
 //{{AFX_DATA_INIT(CCaptureDlg) 7@fd[  
  m_bControl = FALSE; 6N~ jt  
  m_bAlt = FALSE; >,@Fz)\:{'  
  m_bShift = FALSE; <j ;HRm  
  m_Path = _T("c:\\"); nKu`Ta*fX  
  m_Number = _T("0 picture captured."); E;VBoN [  
  nCount=0; ;FMK>%Zq  
  bRegistered=FALSE; ZNOoyWYi5  
  bTray=FALSE; pr;<n\Y{  
 //}}AFX_DATA_INIT 6ynQCD  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 xXA$16kd  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); g~FB&U4c  
} u\t[rC=yd  
[O"i!AQ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 2O<S ig=  
{ )P|%=laE8  
 CDialog::DoDataExchange(pDX); E0xUEAO  
 //{{AFX_DATA_MAP(CCaptureDlg) $rFv(Qc^=  
  DDX_Control(pDX, IDC_KEY, m_Key); 9'8OGCN  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 0a8nBo7A-X  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ^ b-H  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); z6Su`  
  DDX_Text(pDX, IDC_PATH, m_Path); )6bxP&k  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 4 3]6J]!)  
 //}}AFX_DATA_MAP :e+GtN?  
} e!tgWYN  
<' P|g  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 1G.+)*:3  
//{{AFX_MSG_MAP(CCaptureDlg) xBgf)'W_Z  
 ON_WM_SYSCOMMAND() y^;qT_)#  
 ON_WM_PAINT() A'[A!NL%  
 ON_WM_QUERYDRAGICON() :vurU$\  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ^3=8*Xr  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;2L=WR%  
 ON_BN_CLICKED(ID_CHANGE, OnChange) qhK;#<#  
//}}AFX_MSG_MAP ^z[s;:-  
END_MESSAGE_MAP() \RQ5$!O  
.8b 4  
BOOL CCaptureDlg::OnInitDialog() P2`ks[u+i  
{ }s}9@kl;&  
 CDialog::OnInitDialog(); a P{xMB#1h  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); B1nb23SY T  
 ASSERT(IDM_ABOUTBOX < 0xF000); B{)Du :)  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Z]w_2- -  
 if (pSysMenu != NULL) cb'8Li8,j  
 { wTIf#y1=9  
  CString strAboutMenu; -)y"EJ(N  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ;Jx ^  
  if (!strAboutMenu.IsEmpty()) OR?8F5o?p  
  { /jj!DO#  
   pSysMenu->AppendMenu(MF_SEPARATOR); _x UhDu%  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ]"/ *7NM  
  } ,l0s(Cg  
 } GExG1n-  
 SetIcon(m_hIcon, TRUE); // Set big icon 5Qy,P kje  
 SetIcon(m_hIcon, FALSE); // Set small icon f1=8I_>=  
 m_Key.SetCurSel(0); uUc[s"\  
 RegisterHotkey(); -F8%U:2a  
 CMenu* pMenu=GetSystemMenu(FALSE); 3g-}k  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); F6%rH$aS  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ;A- Ef  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6\::Ku4_2  
 return TRUE; // return TRUE unless you set the focus to a control dcHkb,HsO  
} >$R-:>~zN  
LR9'BUfFv  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (/@o7&>*50  
{ +S/8{2%?DG  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) V 8n}"  
 { f_Wn[I{  
  CAboutDlg dlgAbout; =602%ef\  
  dlgAbout.DoModal(); KJ9~"v  
 } ,(c="L4[  
 else !kV?h5@Bo  
 { l" sR\`~  
  CDialog::OnSysCommand(nID, lParam); }DZkCzK  
 } o,aI<5"  
} e;!<3b  
NoKYHN^*w  
void CCaptureDlg::OnPaint() i^QcW!X&  
{ (qPZEZKx  
 if (IsIconic()) %+pXzw`B  
 { $7BD~U   
  CPaintDC dc(this); // device context for painting k?S-peyRO  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )3G?5 OTS  
  // Center icon in client rectangle A@DIq/^xM  
  int cxIcon = GetSystemMetrics(SM_CXICON); Qz$.t>@V=  
  int cyIcon = GetSystemMetrics(SM_CYICON); UI8M<  
  CRect rect; uk\GAm@O  
  GetClientRect(&rect); 2l\Oufer"  
  int x = (rect.Width() - cxIcon + 1) / 2; S:1! )7  
  int y = (rect.Height() - cyIcon + 1) / 2; ,9A[o`b  
  // Draw the icon PMrvUM62  
  dc.DrawIcon(x, y, m_hIcon); ?^"S%Vb  
 } 7gJy xQ  
 else 0;XnNz3&  
 { /1OhW>W3eH  
  CDialog::OnPaint(); c69C=WQ  
 } ~z< ? Wh  
} [6/ %ynlP  
;$%+TN  
HCURSOR CCaptureDlg::OnQueryDragIcon() Pt1Htt:BE  
{ aqyXxJS8  
 return (HCURSOR) m_hIcon; P, >#  
} Wg$MKc9Vy[  
pkxW19h*0  
void CCaptureDlg::OnCancel() #D>8\#53V/  
{ |J6CH87>  
 if(bTray) T 7 h C]R  
  DeleteIcon(); Y.}n,y|J}  
  CDialog::OnCancel(); "arbUX~d  
} gqC:r,a  
Gm6^BYCk  
void CCaptureDlg::OnAbout() ,$*IJeKx  
{ wiFckF/  
 CAboutDlg dlg; a{-}8f6  
 dlg.DoModal(); `[:f;2(@  
}  Ng-3|N  
Pd@?(WQ  
void CCaptureDlg::OnBrowse() ^$T>3@rDB  
{ 1= <Qnmw  
 CString str; Y)a 7osML  
 BROWSEINFO bi; @|cas|U.r  
 char name[MAX_PATH]; r-!8in2  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); e8gD(T  
 bi.hwndOwner=GetSafeHwnd(); f|< *2Mk  
 bi.pszDisplayName=name; t=yM}#r$  
 bi.lpszTitle="Select folder"; U| y+k`  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; w>!KUT  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Qp< 6qM35  
 if(idl==NULL) "1l d4/  
  return; 7Y$p3]0e+  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); {WC{T2:8  
 str.ReleaseBuffer(); SYC_=X  
 m_Path=str; + 1cK (Si  
 if(str.GetAt(str.GetLength()-1)!='\\') $)\ocsO  
  m_Path+="\\"; r?Z8_5Y  
 UpdateData(FALSE); &]ImO RN  
} IRcZyry  
:Tjo+vw7$H  
void CCaptureDlg::SaveBmp() xl<Cstr  
{ "4ovMan  
 CDC dc; N 2x\O~7  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); jt;,7Ek  
 CBitmap bm; /O&j1g@  
 int Width=GetSystemMetrics(SM_CXSCREEN); gN(8T_r  
 int Height=GetSystemMetrics(SM_CYSCREEN); K\;b3  
 bm.CreateCompatibleBitmap(&dc,Width,Height); IJs` 3?  
 CDC tdc; 0_%u(?  
 tdc.CreateCompatibleDC(&dc); BGUP-_&  
 CBitmap*pOld=tdc.SelectObject(&bm); FfP Ce5)  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 8-po|  
 tdc.SelectObject(pOld); PR.?"$!D{  
 BITMAP btm; %+`$Lb?{  
 bm.GetBitmap(&btm); 8Y&(o-R0  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; %*Y:Rm'>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); NB>fr#pb  
 BITMAPINFOHEADER bih; )TP7gLv=b  
 bih.biBitCount=btm.bmBitsPixel; +=:CW'B5  
 bih.biClrImportant=0; a|66[  
 bih.biClrUsed=0; 9?]4s-~  
 bih.biCompression=0; n32BHOVE  
 bih.biHeight=btm.bmHeight; L.erP* w  
 bih.biPlanes=1; Cj ykM])  
 bih.biSize=sizeof(BITMAPINFOHEADER); 1'}~;?_  
 bih.biSizeImage=size; zs7K :OlkA  
 bih.biWidth=btm.bmWidth; K72U0}$B  
 bih.biXPelsPerMeter=0; fpzC#  
 bih.biYPelsPerMeter=0; b~cN#w #  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS);  @4H*kA  
 static int filecount=0; WzZb-F  
 CString name; Z.rKV}yjY  
 name.Format("pict%04d.bmp",filecount++); 3VKArv-  
 name=m_Path+name; `F(KM '  
 BITMAPFILEHEADER bfh; ^ b}_[B  
 bfh.bfReserved1=bfh.bfReserved2=0; IEO5QV:u:  
 bfh.bfType=((WORD)('M'<< 8)|'B'); e >MC 3D`5  
 bfh.bfSize=54+size; Au:Q4x.  
 bfh.bfOffBits=54; 3;#v$F8R  
 CFile bf; A-4\;[P\  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ q*-q5FE  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); }}K4 4<]u  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); dRt]9gIsx  
  bf.WriteHuge(lpData,size); }cMb0`oA  
  bf.Close(); YB~}!F [(  
  nCount++; rHh<_5-/>  
 } llI`"a  
 GlobalFreePtr(lpData); `2U zJ~  
 if(nCount==1) .3!=]=  
  m_Number.Format("%d picture captured.",nCount); >H?8?a D  
 else rsA K0R+  
  m_Number.Format("%d pictures captured.",nCount); HPm12&8,  
  UpdateData(FALSE); C:zK{+  
} FhS:.  
?MyXii<a  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) e=TB/W_  
{ b6Dve]  
 if(pMsg -> message == WM_KEYDOWN) kW5g]Q   
 { =A04E  
  if(pMsg -> wParam == VK_ESCAPE)  [v#t  
   return TRUE; hQPiGIs  
  if(pMsg -> wParam == VK_RETURN) RCo!sZP}  
   return TRUE; k)dLJ<EM  
 } OZs^c2 W  
 return CDialog::PreTranslateMessage(pMsg); t-i;  
} KR%DpQ&{'  
@'s^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -AJe\ J 2  
{ 591Syyy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ "{j4?3f)  
  SaveBmp(); $#8dtF  
  return FALSE; .[ NB"\<q  
} `/8Dmg  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ %fo+Y+t  
 CMenu pop; U,~\}$<I  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); `(.K|l}  
 CMenu*pMenu=pop.GetSubMenu(0); |Fm(  
 pMenu->SetDefaultItem(ID_EXITICON); uI!rJc>TX  
 CPoint pt; PW~+=,  
 GetCursorPos(&pt); V8 }yK$4b  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); nB WVG  
 if(id==ID_EXITICON) p,Qr9p3y  
  DeleteIcon(); ab: yH ')  
 else if(id==ID_EXIT) 2 D>WIOX  
  OnCancel(); 5iwJdm  
 return FALSE; r|:i: ii  
} U;Y{=07a@  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ^#9 &Rk!t  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) "VRcR  
 AddIcon(); \f5$L`  
 return res; lqTTTk  
} y}FTLX $  
tQ&.;{5[f  
void CCaptureDlg::AddIcon() LaG./+IP  
{ pMe'fC~*  
 NOTIFYICONDATA data; NVAt-u0LB  
 data.cbSize=sizeof(NOTIFYICONDATA); yL7D;<!S&  
 CString tip; u`O xY  
 tip.LoadString(IDS_ICONTIP); P=OHiG\z  
 data.hIcon=GetIcon(0); DKx8<yEky  
 data.hWnd=GetSafeHwnd(); py6|uGN  
 strcpy(data.szTip,tip); =rMT1  
 data.uCallbackMessage=IDM_SHELL; nm_]2z O  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; $0~H~ -  
 data.uID=98; s=h  
 Shell_NotifyIcon(NIM_ADD,&data); '%vb&a!.6  
 ShowWindow(SW_HIDE); !X[b 4p  
 bTray=TRUE; 6*J`2U9Q  
} 3pl/k T.\  
P4-`<i]!S  
void CCaptureDlg::DeleteIcon() q;3.pRw(  
{ N0,wT6.  
 NOTIFYICONDATA data; */;[ -9  
 data.cbSize=sizeof(NOTIFYICONDATA); F#*vJb)  
 data.hWnd=GetSafeHwnd(); *$1M= $  
 data.uID=98; u^8:/~8K  
 Shell_NotifyIcon(NIM_DELETE,&data); Y!N *J  
 ShowWindow(SW_SHOW); TL-sxED,,D  
 SetForegroundWindow(); (sHqzWh  
 ShowWindow(SW_SHOWNORMAL); y0k*iS e  
 bTray=FALSE; )7l+\t  
} e)]9u$x  
k7z;^:  
void CCaptureDlg::OnChange() *NHBwXg+  
{ ;P3sDN  
 RegisterHotkey(); jCa%(2~iQ7  
} rXPq'k'h#-  
OX d617  
BOOL CCaptureDlg::RegisterHotkey() B2w\  
{ -!f)P=S  
 UpdateData(); "l&=a1l  
 UCHAR mask=0; 8QDs4Bv|  
 UCHAR key=0; U` uP^  
 if(m_bControl) r BQFC 4L  
  mask|=4; 7=(r k  
 if(m_bAlt) rJ|Q%utYz  
  mask|=2; DN3#W w2[r  
 if(m_bShift) BQu_)@  
  mask|=1; kclClB:PS  
  key=Key_Table[m_Key.GetCurSel()]; W ZdEfY{  
 if(bRegistered){ %5Hsd  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \ 'G%%%;4  
  bRegistered=FALSE; SR7$m<0t*  
 } 0*^ J;QGE  
 cMask=mask; i`U:uwW`  
 cKey=key; 1D%3|_id^  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 5 0uYU[W  
 return bRegistered; M0zJGIT~b  
} ofH=h  
ufyqfID  
  四、小结 eM Ym@~4  
Y /$`vgqs  
  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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