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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: E/IoYuB  
  ])3(@.  
  一、实现方法 R-lpsvDDL2  
|h(05Kbk  
  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: tVFydN~  
4<(U/58a*  
#pragma data_seg("shareddata") `_Fxb@"R  
HHOOK hHook =NULL; //钩子句柄 z3l(4WP  
UINT nHookCount =0; //挂接的程序数目 u/>+cT6}  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 NGq@x%T  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 lz >>{  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey )E>nr Z  
static int KeyCount =0; <yxy ;o  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 K 0Gm ?(  
#pragma data_seg() 6Ud6F t6  
[ 30ta<-  
  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。 yZcnky  
lZ>j:/R8^&  
  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: ngI3.v/R  
rf=ndjrH  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ZW)_dg9  
cKey,UCHAR cMask) -gK*&n~  
{ vn5O8sD  
 BOOL bAdded=FALSE; odaCKhdk  
 for(int index=0;index<MAX_KEY;index++){ _KZ&/  
  if(hCallWnd[index]==0){ wJ Qm7n-+  
   hCallWnd[index]=hWnd; h5^qo ^;g7  
   HotKey[index]=cKey; FBGe s[,  
   HotKeyMask[index]=cMask; o7=#ye&P  
   bAdded=TRUE; aTU[H~dTU  
   KeyCount++; R?L? 6~/q  
   break; 7+;$_,Xo<  
  } fjP(r+[  
 } ![H{ndH!Q  
 return bAdded; %(YU*Tf~  
} c3]`W7E6L  
//删除热键 7*I:cga  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _6!@>`u~  
{ w8iXuRv  
 BOOL bRemoved=FALSE; Iy8fN"I9D  
 for(int index=0;index<MAX_KEY;index++){ QpI\\Zt6  
  if(hCallWnd[index]==hWnd){ .4O~a  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ "HwSW4a]  
    hCallWnd[index]=NULL; 5 ^867  
    HotKey[index]=0; -XNawpl`  
    HotKeyMask[index]=0; UEeq@ot/4  
    bRemoved=TRUE; XT` 2Z=  
    KeyCount--; 4];<` %  
    break; ,d`6 {ll  
   } YHQvx_0yP  
  } tRu j}n+x  
 } Uy98lv  
 return bRemoved; e~P4>3  
} mIh >8))E  
 hSgH;k  
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  DLL中的钩子函数如下: Bj*\)lG<  
qac8zt#2 C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) H9%[! RF  
{ cf+EQY  
 BOOL bProcessed=FALSE; P1qQ)-J  
 if(HC_ACTION==nCode) aGbHDo  
 { !))!! {  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Hn sPXF'8g  
   switch(wParam) K=N8O8R$y  
   {  %Kzu&*9Hb  
    case VK_MENU: Vf#g~IOI  
     MaskBits&=~ALTBIT; o*sss  
     break; [!ilcHE)  
    case VK_CONTROL: +%  !'~  
     MaskBits&=~CTRLBIT; ,,=VF(@G  
     break; F!7\Za,  
    case VK_SHIFT: ?A]/ M~3B  
     MaskBits&=~SHIFTBIT; tV"Jh>Z  
     break; ?XllPnuKt%  
    default: //judge the key and send message M.3ULt8  
     break; JA2oy09G  
   } 7KJ%-&L^  
   for(int index=0;index<MAX_KEY;index++){ ^@HWw@GA  
    if(hCallWnd[index]==NULL) 31 &;3?3>  
     continue; MN^d28^/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m(KBg'kQ  
    { w\lc;4U   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \N[2-;[3  
     bProcessed=TRUE; >J) 9&?  
    } +%=lu14G  
   } M REB  
  } >UnLq:G  
  else if((lParam&0xc000ffff)==1){ //有键按下 ]O&\Pn0q  
   switch(wParam) 3Pgld*i7  
   { ^y.|KA3[  
    case VK_MENU: !S#K6:  
     MaskBits|=ALTBIT; L};P*{q2Z  
     break; L Z}m;  
    case VK_CONTROL: ~?z u5,vb  
     MaskBits|=CTRLBIT; Aaug0X  
     break; S{jm4LZ  
    case VK_SHIFT: i6P'_  
     MaskBits|=SHIFTBIT; p735i`8  
     break; t03T1.:(Mg  
    default: //judge the key and send message WP5Vev9*+  
     break; e(H{C  
   } X:mm<4  
   for(int index=0;index<MAX_KEY;index++){ oer3DD(  
    if(hCallWnd[index]==NULL) I(uM`g  
     continue; 4w#:?Y _\[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1Vx>\A  
    { e/b | sl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); vD76IG jm  
     bProcessed=TRUE; 3$4I  
    } 3w}ul~>j  
   } G * =>  
  } sL)7MtNwy  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 "EBCf.3-  
   for(int index=0;index<MAX_KEY;index++){ Q9k;PJ`@  
    if(hCallWnd[index]==NULL) ^VsE2CX  
     continue; WDJ rN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /BwG\GhM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 1h3`y  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 0-:dzf  
   } sspGB>h8l  
  }  y7vA[us  
 } 4m!w<c0NL  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); } 8[  
} /^$n&gI  
PQ2rNY6  
  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: a y$CUw  
pfQ3Y$z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); YBL.R;^v  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ac'pu,v  
gjzU%{T ?  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ',!>9Dj  
r0s(MyI  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {hoe^07XK  
{ 4+:'$Nw  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) DD}YbuO7  
 { WsW]  1p  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 {Ga=; 0  
  SaveBmp(); D*'sOB(  
  return FALSE; 5DJ!:QY!  
 } ujf7r`;u.  
 …… //其它处理及默认处理 U~w8yMxX  
} O~|Y#T  
YB.@zL0.(  
X/h|;C* 9  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 gF:| j(  
"gt1pf~y  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 p@U[fv8u  
j!"5, ~  
  二、编程步骤 vCUbbQz  
: . PRM+  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; "A0y&^4B@  
ccT <UIpq  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ]"'1-h91  
ji<(}d~L*  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; a7aj:.wi  
sF3@7~m4  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ^O!;KIe{g  
TLq^5,qG  
  5、 添加代码,编译运行程序。 6?a z  
.yHi"ss3  
三、程序代码 eQ*zi9na  
gHFQs](G.  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 3R%yKa#  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) i:Gyi([C  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ~=9S AJr]  
#if _MSC_VER > 1000 Qe_C^ (P  
#pragma once Rm`P.;%  
#endif // _MSC_VER > 1000 TW}].A_-  
#ifndef __AFXWIN_H__ ^fE8|/]nG9  
#error include 'stdafx.h' before including this file for PCH IY|`$sHb  
#endif `VF_rC[?  
#include "resource.h" // main symbols yb,$UT"]  
class CHookApp : public CWinApp i(kx'ua?  
{ <sSH^J4QqX  
 public: Tj}%G  
  CHookApp(); FiSx"o  
  // Overrides &?5me:aU  
  // ClassWizard generated virtual function overrides Mkr &30il[  
  //{{AFX_VIRTUAL(CHookApp) aq\Fh7  
 public: {^k7}`7,  
  virtual BOOL InitInstance(); o#>Mf464I  
  virtual int ExitInstance(); l| y.6v  
  //}}AFX_VIRTUAL DVf}='en8  
  //{{AFX_MSG(CHookApp) 5n1`$T.WG  
  // NOTE - the ClassWizard will add and remove member functions here. L`(\ud  
  // DO NOT EDIT what you see in these blocks of generated code ! ' H4m"  
  //}}AFX_MSG yCuLo`  
  DECLARE_MESSAGE_MAP() P9 y+rF.  
}; M(I%QD  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); )G-u;1rd  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Wiw~oXo  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >!%+9@a}  
BOOL InitHotkey(); 4q.yp0E  
BOOL UnInit(); #fk1'c2  
#endif  ^Vf@J  
a^_W}gzzd  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. wc-v]$DW  
#include "stdafx.h" Ai)>ot  
#include "hook.h" H?,Dv>.#*  
#include <windowsx.h> 14A(ZWwq9  
#ifdef _DEBUG ?f6SKC  
#define new DEBUG_NEW F6}YM|  
#undef THIS_FILE cP\ZeG#<  
static char THIS_FILE[] = __FILE__; !tb!%8{~  
#endif |oSqy  
#define MAX_KEY 100 gyegdky3  
#define CTRLBIT 0x04 ryqu2>(   
#define ALTBIT 0x02 qJ2Z5  
#define SHIFTBIT 0x01 nM *}VI  
#pragma data_seg("shareddata") M+%qVwp  
HHOOK hHook =NULL; x U"g~hT  
UINT nHookCount =0; Pz\ByD  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 4iZg2"[D  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT A 8-a}0Gh  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey *rB@[ (/  
static int KeyCount =0; !yr4B "kz  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift f'*/IG  
#pragma data_seg() (?TK P 7  
HINSTANCE hins; /F46Ac}I  
void VerifyWindow(); <H{K&,Z(ZM  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) lnK  
//{{AFX_MSG_MAP(CHookApp) k7j[tB#  
// NOTE - the ClassWizard will add and remove mapping macros here. 9EY`j,{4  
// DO NOT EDIT what you see in these blocks of generated code! rz&'wCiOO  
//}}AFX_MSG_MAP ;-BN~1Jg  
END_MESSAGE_MAP() \En"=)A  
BoOuN94  
CHookApp::CHookApp() u~>G8y)k9O  
{ x-W~&`UU  
 // TODO: add construction code here, j"fx|6l)  
 // Place all significant initialization in InitInstance q8n@fi6  
} y#8 W1%{x  
i`W~-J  
CHookApp theApp; U| ?68B3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) mU"Am0Bdjq  
{ Y[_|sIy*  
 BOOL bProcessed=FALSE; 'X6Z:dZY  
 if(HC_ACTION==nCode) g4YlG"O[~  
 { X|G[Ma?   
  if((lParam&0xc0000000)==0xc0000000){// Key up 2-jXj9kp`  
   switch(wParam) f~/hsp~Hp  
   { %*o  
    case VK_MENU: &5XEjY>@  
     MaskBits&=~ALTBIT; z30 mk  
     break; EUVD)+it  
    case VK_CONTROL: :U/]*0b  
     MaskBits&=~CTRLBIT; #Ma:Av/ )  
     break; !0P:G#o-$  
    case VK_SHIFT: w%..*+P  
     MaskBits&=~SHIFTBIT; Ul6|LTY  
     break; [zXC\)&!  
    default: //judge the key and send message Gt _tL%  
     break; q'4P/2)va  
   } fD3'Ye<R  
   for(int index=0;index<MAX_KEY;index++){ ^,F G 9  
    if(hCallWnd[index]==NULL) BgT ^  
     continue; Jh&DL8`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) snfFRc(RE  
    { 3~3tjhw;]9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^JMG'@x  
     bProcessed=TRUE; 9U.Ctx:F  
    } W3>9GY90R  
   } 9d/- +j'  
  } u*=^>LD  
  else if((lParam&0xc000ffff)==1){ //Key down R59iuHQ[  
   switch(wParam) Ot\[Ya''  
   { k]r4b`x`  
    case VK_MENU: pQ0*)}l,  
     MaskBits|=ALTBIT; =d ;#Nu-  
     break; p2rT0gu!  
    case VK_CONTROL: 9XDSL[[  
     MaskBits|=CTRLBIT; xcmg3:s  
     break;  \SQ4yc  
    case VK_SHIFT: jR[c3EA ;  
     MaskBits|=SHIFTBIT; e>e${\ =,  
     break; I9+h-t  
    default: //judge the key and send message :fL7"\ pf~  
     break; pA_u;*  
   } sPW :[  
   for(int index=0;index<MAX_KEY;index++) H3R{+7  
   { BRY/[QRqZ  
    if(hCallWnd[index]==NULL) -['& aey}a  
     continue; 3>L5TYa  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8g_kZ^<[  
    { 0<@['W}G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); e/+.^ '{  
     bProcessed=TRUE; #>:S&R?2t  
    } E+XS7':I  
   } |?^qs nB  
  } !=,zy  
  if(!bProcessed){ }UGSE2^1  
   for(int index=0;index<MAX_KEY;index++){ \VOv&s;h  
    if(hCallWnd[index]==NULL) 0F- +)S?M[  
     continue; Tb2#y]27  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ZLKbF9lo  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); m5N,[^-  
   }  C&qo$C  
  } V 1d#7rP  
 } Q~wS2f`)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); L#a!fd  
} <h#W*a  
tF/Ni*\^rV  
BOOL InitHotkey() ~PyS;L}  
{ Wm"#"l4  
 if(hHook!=NULL){ x(EwHg>;  
  nHookCount++; ZEDvY=@a   
  return TRUE; <Bn0wr8)\  
 } %?+Lkj&  
 else hTEb?1CXU  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); BH}Cx[n?~  
  if(hHook!=NULL) SOsz=bVx  
   nHookCount++; fNx!'{o"  
  return (hHook!=NULL); |n;);T(  
} @IbZci)1  
BOOL UnInit() 1@LUxU#Uu$  
{ > JA-G@3i  
 if(nHookCount>1){ V+lS\E.  
  nHookCount--; q!U$\Q&  
  return TRUE; Tzj v-9^V  
 } *rxYal4ad  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 7>MG8pf3a  
 if(unhooked==TRUE){ K^"l.V#J  
  nHookCount=0; WY@g=W>+  
  hHook=NULL; l0t(t*[Mj  
 } SnUR?k1  
 return unhooked; #d[Nm+~ko  
} E+<GsN]  
~$^ >Vo  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #M!{D  
{ lq3D!+ m  
 BOOL bAdded=FALSE; cg]Gt1SU  
 for(int index=0;index<MAX_KEY;index++){ qo \9,<  
  if(hCallWnd[index]==0){ `mD!z.`U  
   hCallWnd[index]=hWnd; 6/g 82kqpk  
   HotKey[index]=cKey; Z 369<  
   HotKeyMask[index]=cMask; @C=gMn.E  
   bAdded=TRUE; AH'3 5Kf)  
   KeyCount++; 1K|F;p  
   break; u~ FVI  
  } B9 ?58v&  
 } *m>[\)  
 return bAdded; ,1CmB@  
} bxO/FrwTj{  
=)jo}MB  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~9k E.  
{ `?l /HUw  
 BOOL bRemoved=FALSE; `) ],FE*:  
 for(int index=0;index<MAX_KEY;index++){ T]/>c  
  if(hCallWnd[index]==hWnd){ (w"(RM~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ZO<\rX (  
    hCallWnd[index]=NULL; ()t~X Q  
    HotKey[index]=0; PC255  
    HotKeyMask[index]=0; yEh{9S%6p  
    bRemoved=TRUE; If&y 5C  
    KeyCount--; u+6D|  
    break; [%6)  
   } ?5};ONjN  
  } Vep 41\g^  
 } vQ2{ +5!|  
 return bRemoved; iY,oaC~?"N  
} %WmTG }L)  
@y * TVy  
void VerifyWindow() BjTgZ98J  
{ y[AB,Dd  
 for(int i=0;i<MAX_KEY;i++){ 9Nv?j=*$  
  if(hCallWnd!=NULL){ 6 A#xFPYY{  
   if(!IsWindow(hCallWnd)){ ug;\`.nT^  
    hCallWnd=NULL; ?0JNaf  
    HotKey=0; i!RYrae  
    HotKeyMask=0; k w   
    KeyCount--; yFd94 2  
   } K@Q%NK,  
  } Z8Vof~  
 } II~91IEk  
} o"A)t=  
,D<U PtPQ  
BOOL CHookApp::InitInstance() :mf&,?  
{ r[GH#vF;7  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); VUHf-bKl  
 hins=AfxGetInstanceHandle(); !V/7q'&t=  
 InitHotkey(); 4UzXTsjM7  
 return CWinApp::InitInstance(); \\Q){\S  
} 5e7\tBab  
}ALli0n`V)  
int CHookApp::ExitInstance() 7kT X  
{ aXZi2  
 VerifyWindow(); G^dzE/ :  
 UnInit(); o>Dd1 j  
 return CWinApp::ExitInstance(); -Xw S?*O  
} W_3BL]^=  
&uBf sa$  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Bm%|WQK  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) b+hN\/*]  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~kDJ-V  
#if _MSC_VER > 1000 8]1,EE<  
#pragma once bs16G3- p  
#endif // _MSC_VER > 1000 Xrpvq(]  
+qT+iHa|n  
class CCaptureDlg : public CDialog #qD[dC$[t  
{ U^U hZ!  
 // Construction $4)L~g|  
 public: u$(ei2f  
  BOOL bTray; |R!ozlL{}  
  BOOL bRegistered; bz~aj}"`  
  BOOL RegisterHotkey(); ]?oJxW.  
  UCHAR cKey; K~S*<?  
  UCHAR cMask; @M'qi=s*  
  void DeleteIcon(); I'p+9H$  
  void AddIcon(); Q1|zX@,  
  UINT nCount; yaWY>sB  
  void SaveBmp(); ?cKTeGrS  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor p0]\QM l1  
  // Dialog Data k#8`996P  
  //{{AFX_DATA(CCaptureDlg) -Wh 2hWg+  
  enum { IDD = IDD_CAPTURE_DIALOG }; "Ehh9 m1&  
  CComboBox m_Key; <8Nr;96IA  
  BOOL m_bControl; f\.y z[  
  BOOL m_bAlt; #e,TS`"eD  
  BOOL m_bShift; a) P r&9I  
  CString m_Path; 6PS[OB{3  
  CString m_Number; b0f6p>~q^  
  //}}AFX_DATA uwZ,l-6T  
  // ClassWizard generated virtual function overrides Cg`lQY U  
  //{{AFX_VIRTUAL(CCaptureDlg) <hTHY E=  
 public: o90g;Vog  
  virtual BOOL PreTranslateMessage(MSG* pMsg); tns8B  
 protected: o)7Ot\:E  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support J]{<Z?%  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); dga4|7-MY  
  //}}AFX_VIRTUAL [C<K~  
  // Implementation <m VFC  
 protected: UL>2gl4s/  
  HICON m_hIcon; op9vz[o#4  
  // Generated message map functions ,9_O4O%  
  //{{AFX_MSG(CCaptureDlg) ^~7Mv^A  
  virtual BOOL OnInitDialog(); "19#{yX4  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); [{)Z^  
  afx_msg void OnPaint(); @ F $}/  
  afx_msg HCURSOR OnQueryDragIcon(); (6:.u.b  
  virtual void OnCancel(); NqNU:_}  
  afx_msg void OnAbout(); ;Oqf{em];  
  afx_msg void OnBrowse(); #=33TvprR2  
  afx_msg void OnChange(); W83PMiN"T-  
 //}}AFX_MSG '-[hy>t  
 DECLARE_MESSAGE_MAP() X"r.*fb;N  
}; w\eC{,00:  
#endif =s]2?m  
j2u'5kJ G  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file XBkaum4j  
#include "stdafx.h" 5$HG#2"Kb#  
#include "Capture.h" H.' 9]*  
#include "CaptureDlg.h" <g;,or#$  
#include <windowsx.h> &0%Z b~ts  
#pragma comment(lib,"hook.lib") .35~+aqC  
#ifdef _DEBUG pUF JQ*  
#define new DEBUG_NEW @fp@1n  
#undef THIS_FILE xRhGBb{@s  
static char THIS_FILE[] = __FILE__; {k-_+#W"  
#endif HQ" trV  
#define IDM_SHELL WM_USER+1 GIcq|Pe  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &|ne!wu  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); A%F8w'8(  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; R%\3[  
class CAboutDlg : public CDialog C,W_0= !e  
{ 26nwUNak  
 public: hZL!%sL7  
  CAboutDlg(); b|DU  
  // Dialog Data f:&JKB)N  
  //{{AFX_DATA(CAboutDlg) !-470J  
  enum { IDD = IDD_ABOUTBOX }; ]GY8f3~|{  
  //}}AFX_DATA  aY(s &  
  // ClassWizard generated virtual function overrides 0=6mb]VUi=  
  //{{AFX_VIRTUAL(CAboutDlg) {nUmlP=mS  
 protected: xW5`.^5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support QK0]9   
  //}}AFX_VIRTUAL fx(8 o+  
  // Implementation o4EY2  
 protected: 8w:mL^6x  
  //{{AFX_MSG(CAboutDlg) m[2[9 bQ0  
  //}}AFX_MSG V61oK  
  DECLARE_MESSAGE_MAP() mHju$d  
}; wZ\93W-}  
NcF>}f,}\  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @#t<!-8d  
{ \-6y#R-B  
 //{{AFX_DATA_INIT(CAboutDlg) {Hl(t$3V`  
 //}}AFX_DATA_INIT =CD6x= l6  
} >h#juO"  
R(^Sse  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6c-'CW  
{ |g^YD;9s.  
 CDialog::DoDataExchange(pDX); u;rmqo1  
 //{{AFX_DATA_MAP(CAboutDlg) (n?f016*%d  
 //}}AFX_DATA_MAP hf9i%,J  
} hN=kU9@knC  
zNKB'hsK  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) VpHwc!APq  
 //{{AFX_MSG_MAP(CAboutDlg) x  zF  
 // No message handlers 1<#D3CXK  
 //}}AFX_MSG_MAP |&WYu,QQ4  
END_MESSAGE_MAP() ]] 0M  
5ILKYUg,  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ,JK0N_=  
: CDialog(CCaptureDlg::IDD, pParent) WeH_1$n5  
{ ;ZI8vF b  
 //{{AFX_DATA_INIT(CCaptureDlg) vW*Mf}=  
  m_bControl = FALSE; oi7k#^  
  m_bAlt = FALSE; #BBDI  
  m_bShift = FALSE; k}<H  
  m_Path = _T("c:\\"); URm<Ji  
  m_Number = _T("0 picture captured."); -nC&t~sD  
  nCount=0; CStNCBZ|\  
  bRegistered=FALSE; v mkiw1  
  bTray=FALSE; DU"Gz!X]Jd  
 //}}AFX_DATA_INIT mMZ{W+"[f  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 [O_5`X9|  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 9x4z m  
} +0ukLc@  
oP56f"BE(  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) fI0"#i v}  
{ g_l-@  
 CDialog::DoDataExchange(pDX); aDX&j2/  
 //{{AFX_DATA_MAP(CCaptureDlg) B:v_5e\f@  
  DDX_Control(pDX, IDC_KEY, m_Key); )3e_H s+  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Y+23 jlgb  
  DDX_Check(pDX, IDC_ALT, m_bAlt); \^y~w~g?  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); [Nm?qY  
  DDX_Text(pDX, IDC_PATH, m_Path); /O.q4p  
  DDX_Text(pDX, IDC_NUMBER, m_Number); b+whZtNk7  
 //}}AFX_DATA_MAP RfvvX$  
} Y}.f&rLe  
.c<U5/  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) -t<1A8%  
//{{AFX_MSG_MAP(CCaptureDlg) I'{Ctc  
 ON_WM_SYSCOMMAND() rf+}J_  
 ON_WM_PAINT() ak:f4dEd  
 ON_WM_QUERYDRAGICON() &DYC3*)Jih  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Iy*Q{H3[  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) p%bMfi*T  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 4,QA {v  
//}}AFX_MSG_MAP M9Sj@ww  
END_MESSAGE_MAP() u"hr4+/  
4<1V  
BOOL CCaptureDlg::OnInitDialog() N&k\X]U  
{ h|'|n/F  
 CDialog::OnInitDialog(); vOKNBR2  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); fYZd:3VdC  
 ASSERT(IDM_ABOUTBOX < 0xF000); qPDRB.K|}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); U_aI!`WXd  
 if (pSysMenu != NULL) qycf;Kl:6  
 { -3d`e2^&}  
  CString strAboutMenu; Kt]vTn7!9  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ZK2&l8  
  if (!strAboutMenu.IsEmpty()) G^L9[c= ,  
  {  4J=6U&b  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9$[MM*r  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 8>vNa  
  } 7bGt'gvv  
 } c-.F {~  
 SetIcon(m_hIcon, TRUE); // Set big icon Ik5-ooZ&{  
 SetIcon(m_hIcon, FALSE); // Set small icon 2|RxowXZ"  
 m_Key.SetCurSel(0); Z5wQhhH  
 RegisterHotkey(); ?0z/i^I  
 CMenu* pMenu=GetSystemMenu(FALSE); _E-{*,7bZS  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); zC[LcC*+J  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); hlc g[Qdo*  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Ym -U{a  
 return TRUE; // return TRUE unless you set the focus to a control Pq-@waH3  
} _q@lP|  
 ]5ibg"{S  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) :=q9ay   
{ I%j]pY4  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) =''*'a-P  
 { l9y%@7  
  CAboutDlg dlgAbout; Vj)"?|V  
  dlgAbout.DoModal(); oOXJ7 |n  
 } >: @\SU  
 else @JP6F[d  
 { xw1,Wbu]  
  CDialog::OnSysCommand(nID, lParam); &s\,+d0  
 } F[v^43-^_  
} 0q1+5  
J04R,B  
void CCaptureDlg::OnPaint() lKRp9isn^  
{ lL'K1%{+ \  
 if (IsIconic()) j_zy"8Y{  
 { [R~@#I P!  
  CPaintDC dc(this); // device context for painting N=8CVI  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ')fIa2dO/  
  // Center icon in client rectangle }4Gn$'e  
  int cxIcon = GetSystemMetrics(SM_CXICON); , d4i0;2}+  
  int cyIcon = GetSystemMetrics(SM_CYICON); ,zBc-Cm  
  CRect rect; ^M1O)   
  GetClientRect(&rect); p1ER<_fp  
  int x = (rect.Width() - cxIcon + 1) / 2; {N-*eV9#  
  int y = (rect.Height() - cyIcon + 1) / 2; K<u~[^R  
  // Draw the icon yN}<l%  
  dc.DrawIcon(x, y, m_hIcon); g87M"kQKA  
 } j8t_-sU9 i  
 else JQ\o[t  
 { t 9.iWIr  
  CDialog::OnPaint(); DEzL]1;P  
 }  ck`$ `  
} }-WuHh#  
@Z~0!VY  
HCURSOR CCaptureDlg::OnQueryDragIcon() _1\H{x  
{ .ityudT<  
 return (HCURSOR) m_hIcon; `[f IK,  
} ) .H nK  
T!5g:;~y >  
void CCaptureDlg::OnCancel() D_I_=0qNd  
{ ~eGtoEY  
 if(bTray) PF;`mdi-,  
  DeleteIcon(); xx%*85<  
  CDialog::OnCancel(); DTx>^<Tk  
} js=w!q0)9  
54&&=NVs|  
void CCaptureDlg::OnAbout() \OF"hPq  
{ d[KG0E5`  
 CAboutDlg dlg; 9t0NO-a  
 dlg.DoModal(); }nNCgH  
} !iGZo2LV  
p \,PY  
void CCaptureDlg::OnBrowse() cz*Z/5XH  
{ ^G(+sb[t  
 CString str; 32):&X"AIh  
 BROWSEINFO bi; pd}af iF  
 char name[MAX_PATH]; ~FZ=  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); e_CgZ  
 bi.hwndOwner=GetSafeHwnd(); ;z^C\=om  
 bi.pszDisplayName=name; Sc$]ar]S  
 bi.lpszTitle="Select folder"; z4c{W~}`  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; {= l 9{K`~  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ^<'=]?xr  
 if(idl==NULL) .^* .-8q  
  return; 9.$k^|~  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Yf,U2A\  
 str.ReleaseBuffer(); x AR9* <-  
 m_Path=str; v`pIovn  
 if(str.GetAt(str.GetLength()-1)!='\\') pWXoJ0N  
  m_Path+="\\"; dJd(m&.|N  
 UpdateData(FALSE); !BW6l)=L  
} |Orp:e!  
+&hd3  
void CCaptureDlg::SaveBmp() ;?0k>  
{ -XtDGNH F  
 CDC dc; 2_lb +@[W  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); qY$/i#  
 CBitmap bm; re\&'%~K  
 int Width=GetSystemMetrics(SM_CXSCREEN); sKI{AHJ?X  
 int Height=GetSystemMetrics(SM_CYSCREEN); Y5Jrkr)k  
 bm.CreateCompatibleBitmap(&dc,Width,Height); |/-H:\5  
 CDC tdc; !r*Ogv[  
 tdc.CreateCompatibleDC(&dc); vEIDf{  
 CBitmap*pOld=tdc.SelectObject(&bm); INj2B@_  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 8P= z"y  
 tdc.SelectObject(pOld); !4B($]t  
 BITMAP btm; k&PxhDf  
 bm.GetBitmap(&btm); u*J,3o} <  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; @NS=  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Wp<4F 6C$@  
 BITMAPINFOHEADER bih; k-&fPEjG  
 bih.biBitCount=btm.bmBitsPixel; WS?"OTH.^\  
 bih.biClrImportant=0; h{&}p-X&[  
 bih.biClrUsed=0;  0"_FQv  
 bih.biCompression=0; g~JN"ap  
 bih.biHeight=btm.bmHeight; m:,S1V_jl  
 bih.biPlanes=1; pIy+3&\e;  
 bih.biSize=sizeof(BITMAPINFOHEADER); 2#bpWk9  
 bih.biSizeImage=size; 2Po e-=  
 bih.biWidth=btm.bmWidth; 4iiW{rh4  
 bih.biXPelsPerMeter=0; El$yM.M"  
 bih.biYPelsPerMeter=0; VnB"0 "%w  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); OTNcNY  
 static int filecount=0; t_PAXj  
 CString name; `|\z#Et  
 name.Format("pict%04d.bmp",filecount++); Rh:edQ #  
 name=m_Path+name; -_@3!X1~i+  
 BITMAPFILEHEADER bfh; o0Y {k8  
 bfh.bfReserved1=bfh.bfReserved2=0; rG _T!']~  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Ne)H*DT  
 bfh.bfSize=54+size; ~hSr06IY  
 bfh.bfOffBits=54; yrnIQu*Uu  
 CFile bf; #R<ErX)F  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8R;)WlLu=  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #G;0yB:76  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); f?OFMac  
  bf.WriteHuge(lpData,size); A3VXh^y+  
  bf.Close(); $y\\ ?  
  nCount++; 2`XG"[@  
 } -^i[   
 GlobalFreePtr(lpData); XANPI|  
 if(nCount==1) s%K 9;(RWI  
  m_Number.Format("%d picture captured.",nCount); FvpI\%#~  
 else z3V[ Vi  
  m_Number.Format("%d pictures captured.",nCount); '+6SkZ  
  UpdateData(FALSE); WQ(*A $  
} <g SZt\  
|2#)lGA  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) UQmdm$.  
{ LZirw'  
 if(pMsg -> message == WM_KEYDOWN) kf3 u',}R  
 { 5.KhI<[  
  if(pMsg -> wParam == VK_ESCAPE) afVl)2h  
   return TRUE; .Du-~N4\  
  if(pMsg -> wParam == VK_RETURN) KiXRBFo  
   return TRUE; TC7Rw}jF  
 } To_Y 8 G  
 return CDialog::PreTranslateMessage(pMsg); u|v2J/_5Y  
} Vz(O=w=  
n&? --9r  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #nTzn2  
{ q2o`.f+I  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ VI{!ZD]  
  SaveBmp(); `Ap<xT0H  
  return FALSE; D"x;/I  
} >5rb4  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ z}>q/!q  
 CMenu pop; CK<Wba  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Q{s9{  
 CMenu*pMenu=pop.GetSubMenu(0); : MfY8P)  
 pMenu->SetDefaultItem(ID_EXITICON); l[Hgh,  
 CPoint pt; ID/=YG@  
 GetCursorPos(&pt); 2U;6sn*e  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ?AMn>v  
 if(id==ID_EXITICON) q%g!TFMg  
  DeleteIcon(); cPFs K*w  
 else if(id==ID_EXIT) = ;hz,+  
  OnCancel(); xSnkv,my<  
 return FALSE; ] LcCom:]  
} %25GplMT  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); fi |k)  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 2P`Z >_  
 AddIcon(); z|p C*1A\  
 return res; 'T!^H  
} t)!(s,;T  
w"A.*8Iu  
void CCaptureDlg::AddIcon() }:04bIaV  
{ sbeS9vE  
 NOTIFYICONDATA data; e}xx4mYo  
 data.cbSize=sizeof(NOTIFYICONDATA); -rn%ASye  
 CString tip; aR- ?t14  
 tip.LoadString(IDS_ICONTIP); ZGa;'  
 data.hIcon=GetIcon(0); /AT2<w  
 data.hWnd=GetSafeHwnd(); apz) 4%A  
 strcpy(data.szTip,tip); n<GTc{>Z  
 data.uCallbackMessage=IDM_SHELL; !HV<2q()  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; f ye=8 r  
 data.uID=98; H ~VeY\:w  
 Shell_NotifyIcon(NIM_ADD,&data); ?M<q95pL  
 ShowWindow(SW_HIDE); -z s5WaJn/  
 bTray=TRUE; 9;ZaL7>  
} UrMEL; @g  
!_yWe  
void CCaptureDlg::DeleteIcon() ?:sk [f6  
{ f/?uo sS  
 NOTIFYICONDATA data; #YiphR&  
 data.cbSize=sizeof(NOTIFYICONDATA); j[ fE^&  
 data.hWnd=GetSafeHwnd(); 8q}955Nl  
 data.uID=98; m@,u&9K  
 Shell_NotifyIcon(NIM_DELETE,&data); A$7j B4  
 ShowWindow(SW_SHOW); ~x-"?K  
 SetForegroundWindow(); io[>`@=  
 ShowWindow(SW_SHOWNORMAL); F|wT']1Y  
 bTray=FALSE; rk E;OU  
} 99KW("C1F  
+u[^@>_I0  
void CCaptureDlg::OnChange() hFQ*50n}  
{ I(5sKU3<  
 RegisterHotkey(); ;%ng])w=;  
} X-_ $jKfM  
G`oY(2U  
BOOL CCaptureDlg::RegisterHotkey() Ib&]1ger#=  
{ "Dt: 8Nf^  
 UpdateData(); @'> Ul!.]  
 UCHAR mask=0; 6)h~9iK  
 UCHAR key=0; {0o ,2]o!:  
 if(m_bControl) gb^<6BYUG  
  mask|=4; \z8j6 h  
 if(m_bAlt) H "; !A=0  
  mask|=2; N hY`_?)  
 if(m_bShift) ,Qh9}I7;C  
  mask|=1; 6N#0D2~^  
  key=Key_Table[m_Key.GetCurSel()]; N0V`xrS  
 if(bRegistered){ N?{.}-Q  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); :#zVF[Y(2  
  bRegistered=FALSE; 0hpU9w}12  
 } @TraEBJGL  
 cMask=mask; Jwtt&" c0.  
 cKey=key; ?X'l&k>  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Njmb{L]Cps  
 return bRegistered; t!&p5wJ*Q  
} r @URs;O=  
-d]v6q'1  
  四、小结 3n)\D<f]#  
9zD,z+  
  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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