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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: 5fBW#6N/  
  scUWI"  
  一、实现方法 ghiFI<)VY  
wLC|mByq  
  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: A`Bg"k:D  
.HG0%Vp  
#pragma data_seg("shareddata") @[S\ FjI  
HHOOK hHook =NULL; //钩子句柄 c;bp[ Y3R  
UINT nHookCount =0; //挂接的程序数目 dDy9yw%f?  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 _, ;c2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 w_I}FPT<(:  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Aj4i}pT  
static int KeyCount =0; &`63"^y  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 {E`f(9r:  
#pragma data_seg() A:ef}OCL  
}T+pd#>  
  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。 MqI!i>  
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  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: T;}pMRd%  
*Ta*0Fr=9|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 0BIH.ZV#  
cKey,UCHAR cMask) kf$0}T`  
{ @$;"nVZ4v  
 BOOL bAdded=FALSE; M(S:&GOU  
 for(int index=0;index<MAX_KEY;index++){ 8\t~ *@"  
  if(hCallWnd[index]==0){ mY3x (#I  
   hCallWnd[index]=hWnd; m`-{ V<(M  
   HotKey[index]=cKey; d7tH~9GX8  
   HotKeyMask[index]=cMask; cX553&  
   bAdded=TRUE; C sn"sf  
   KeyCount++; @K]D :MSS  
   break; 3%xj-7z W  
  } SVaC)O(  
 } z&d&Ky  
 return bAdded; V4Ql6vg_f  
} H5=-b@(  
//删除热键 q=E<y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jO$3>q  
{ Xi1/wbC  
 BOOL bRemoved=FALSE; WrL&$dEJ?M  
 for(int index=0;index<MAX_KEY;index++){ U)+Yh  
  if(hCallWnd[index]==hWnd){ }} l04kN_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -pc*$oe  
    hCallWnd[index]=NULL; \=4[v-3 H  
    HotKey[index]=0; p}}o#a~V),  
    HotKeyMask[index]=0; q!9SANTx  
    bRemoved=TRUE; R y0n_J:7  
    KeyCount--; zrG&p Z  
    break; _Y*]'?g`  
   } Q5/".x^@  
  } 2bfKD'!aH  
 } 4?,N;Q  
 return bRemoved; +=^10D  
} a4L8MgF&$-  
3ePG=^K^  
L*1C2EL/q  
  DLL中的钩子函数如下: `(EY/EsY  
 &jf:7y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~k4S~!(U0  
{ ,)nO   
 BOOL bProcessed=FALSE; SV}I+O_w  
 if(HC_ACTION==nCode) W :jC2,s!m  
 { WeE>4>^  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ,Rk;*MEMJ  
   switch(wParam) c63DuHA*C  
   {  Y|g8xkI}XB  
    case VK_MENU: '$PiyM|V  
     MaskBits&=~ALTBIT; c Q|nL  
     break; /A4zR  
    case VK_CONTROL: 4E}/{1  
     MaskBits&=~CTRLBIT; tD.md _E  
     break; |28z4.  
    case VK_SHIFT:  =h\,-8  
     MaskBits&=~SHIFTBIT; (5re'Pl  
     break; &hEtVkK  
    default: //judge the key and send message 7g cr$&+e  
     break; ]4yWcnf  
   } B{lBUv(B  
   for(int index=0;index<MAX_KEY;index++){ V,fSn:8%M  
    if(hCallWnd[index]==NULL) uMtq4.  
     continue; $3|++?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :a R&t#<"E  
    { J"L+`i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Z~ VOO7|m  
     bProcessed=TRUE; r'uD|T H  
    } Oj6-  
   } YgC J s;  
  } 0$%:zHi5g  
  else if((lParam&0xc000ffff)==1){ //有键按下 dQQh$*IL?{  
   switch(wParam) (2Z-NVU#  
   { VlXUrJ9&  
    case VK_MENU: fa;\4#  
     MaskBits|=ALTBIT; t{| KL<d]  
     break; 7 /w)^&8  
    case VK_CONTROL: c=K . |g,  
     MaskBits|=CTRLBIT; r*fZS$e  
     break; Q}2aBU.f  
    case VK_SHIFT: J1T_wA_  
     MaskBits|=SHIFTBIT; >uN{cohs  
     break; [nB[]j<R*  
    default: //judge the key and send message ^+^#KC8]W  
     break; anjU3j  
   } !jGe_xB}~  
   for(int index=0;index<MAX_KEY;index++){ ,&rlt+wE  
    if(hCallWnd[index]==NULL) ;"$Wfy  
     continue; a.#`>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UR44 iA]  
    { Ds? @ LE|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {M96jjiInf  
     bProcessed=TRUE; /qa{*"2Qo  
    } YD_hg#=n  
   } lO! Yl:;m%  
  } ]*|+06  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 (B{`In8G>y  
   for(int index=0;index<MAX_KEY;index++){ \C $LjSS-  
    if(hCallWnd[index]==NULL) : a @_GIC  
     continue; > L_kSC?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) sa$CCQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); lk]q\yO_%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 eW, {E)x:  
   } HjAhz  
  } 4t]ccqX*{  
 } VAX@'iZr  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); w{l}(:xPp  
} |*ss`W7F,2  
vg[A/$gLM  
  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: Zvz Zs  
Jw3VWc ]]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); UKV0xl  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); YEH /22  
$5N%!  
  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: \!M6-kmi  
t% Sgw%f  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ut.%=o;&[  
{ m/@ ;N,K  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) !Hq$7j_  
 { 2o2jDQ|7  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 @6\Id7`Ea  
  SaveBmp(); A!B: vJ  
  return FALSE; /9T.]H ~  
 } _)-t#Ve  
 …… //其它处理及默认处理 3m%oXT  
} C+o1.#]JM  
n-zAkKM  
x7\b-EC  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ]!CMo+  
O(x1Ja,&  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 }huj%Pnk )  
3-x ;_  
  二、编程步骤 B' }h6ZH  
9U~fc U6  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; U )kl !  
8J|2b; Vf  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Nz/PAs7g6  
JBqL0H  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Qw>~] d,Z  
c12mT(+-  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; NxY B)`~  
>TI/W~M  
  5、 添加代码,编译运行程序。 r@")MOGc  
(;\" K?  
三、程序代码 [$\KS_,Mn  
B&:9uPRzZ  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL WH|TdU$V  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) gOiZ8K!  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ZHu"& &  
#if _MSC_VER > 1000 >b\{y}[  
#pragma once `Iwl\x[A  
#endif // _MSC_VER > 1000 |5il5UP  
#ifndef __AFXWIN_H__ 7v'aw"~  
#error include 'stdafx.h' before including this file for PCH J9aqmQj('  
#endif U{1%ldOJ%  
#include "resource.h" // main symbols xB5qX7*.  
class CHookApp : public CWinApp p>#sR4d>  
{ `qoRnG  
 public: F8xz^UQO  
  CHookApp(); ^mH:8_=(.  
  // Overrides HSwC4y}  
  // ClassWizard generated virtual function overrides 2 |`7_*\  
  //{{AFX_VIRTUAL(CHookApp) -gn!8G1  
 public: -S\gDB bb  
  virtual BOOL InitInstance(); HxUJ 0Q  
  virtual int ExitInstance(); v 9k\[E?  
  //}}AFX_VIRTUAL _2Zc?*4  
  //{{AFX_MSG(CHookApp) ,GeW_!Q[  
  // NOTE - the ClassWizard will add and remove member functions here. _oz1'}=  
  // DO NOT EDIT what you see in these blocks of generated code ! :m]KVcF.  
  //}}AFX_MSG ql/K$#u  
  DECLARE_MESSAGE_MAP() )6 U6~!k  
}; J:Mn 5hdK=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); >c`r&W.t  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h2jrO9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M!i["($_  
BOOL InitHotkey(); Fs$mLa  
BOOL UnInit(); *@;bWUJ  
#endif GG &J  
G*s5GG@Z.  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. SI`ems{1>c  
#include "stdafx.h" vVhSl$mW  
#include "hook.h" mzO5&h7  
#include <windowsx.h> 8I8{xt4   
#ifdef _DEBUG xe"A;6H  
#define new DEBUG_NEW 5J-slNNCQ  
#undef THIS_FILE U8S<wf&  
static char THIS_FILE[] = __FILE__; M{z&h>  
#endif D`'h8:\  
#define MAX_KEY 100 zK_Q^M`  
#define CTRLBIT 0x04 VwN=AFk Oj  
#define ALTBIT 0x02 \h>6k  
#define SHIFTBIT 0x01 1y3)ogL  
#pragma data_seg("shareddata") a#D \8;  
HHOOK hHook =NULL; 8B?*?,n5  
UINT nHookCount =0; %45*DT  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey %E8HLTEvl  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ~@#s<a,%;  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey j'x@P+A  
static int KeyCount =0; -!lSk?l  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift G#L6;  
#pragma data_seg() 63`5A3rii  
HINSTANCE hins; `#*`hH8  
void VerifyWindow(); "M;[c9  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) &t U&ZH  
//{{AFX_MSG_MAP(CHookApp) {3T&6LA  
// NOTE - the ClassWizard will add and remove mapping macros here. z? Iu;X  
// DO NOT EDIT what you see in these blocks of generated code! s .@Szq  
//}}AFX_MSG_MAP qXprD.; }  
END_MESSAGE_MAP() qP[_!C.  
I)\{?LdHR  
CHookApp::CHookApp() v}5||s!=  
{ U:AB%gr[  
 // TODO: add construction code here, TH"<6*f2L  
 // Place all significant initialization in InitInstance u g_c}Nv=Y  
} i,zZJ=a$  
a8YFH$Xh  
CHookApp theApp; !a4`SjOgu  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ')T*cLQ><  
{ ]`q]\EH  
 BOOL bProcessed=FALSE; fh*7VuAc  
 if(HC_ACTION==nCode) R5 i xG9  
 { \WqC^Di  
  if((lParam&0xc0000000)==0xc0000000){// Key up x"7PnN|~  
   switch(wParam) B?db`/G9  
   { aECpe'!m4  
    case VK_MENU: $0cE iq?Hf  
     MaskBits&=~ALTBIT; e= XC$Jv  
     break; |hS^eK_  
    case VK_CONTROL: _1jbNQa  
     MaskBits&=~CTRLBIT; aI>F8R?  
     break; !gL1  
    case VK_SHIFT: G?^w <  
     MaskBits&=~SHIFTBIT; z5_jx&^Z  
     break; \j<aFOT(  
    default: //judge the key and send message : sG/  
     break; l1.eAs5U  
   } \qDY0hIv t  
   for(int index=0;index<MAX_KEY;index++){ Mr*CJgy  
    if(hCallWnd[index]==NULL) SBaTbY0  
     continue; dUBf.2 ry  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cj4o[l  
    { _aU :[v*!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); hltUf5m'b  
     bProcessed=TRUE; BI<(]`FP;s  
    } J vl-=~  
   } _} j6Pw'  
  } g* -}9~  
  else if((lParam&0xc000ffff)==1){ //Key down L'$({  
   switch(wParam) Zbr1e5?  
   { =Qn8Y`U  
    case VK_MENU: iOk`_LG#  
     MaskBits|=ALTBIT; 4QE")Ge  
     break; O) )j  
    case VK_CONTROL:  T4J WZ  
     MaskBits|=CTRLBIT; N3V4Mpf  
     break; ]M 2n%9  
    case VK_SHIFT: #<@_mbQ@|K  
     MaskBits|=SHIFTBIT; UhXVeGO  
     break; <'j ygZ(  
    default: //judge the key and send message #sv:)p  
     break; J[UTn'M8]  
   } #^_7i)=~  
   for(int index=0;index<MAX_KEY;index++) F ~e}=Nb  
   { *l@T 9L[M'  
    if(hCallWnd[index]==NULL) Odm1;\=Eg+  
     continue; rcf#8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *o6QBb  
    { p`S~UBcL.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); z<s ~`  
     bProcessed=TRUE; 7H)tF&  
    } ?IDkDv!na~  
   } DG=_E\"#  
  } ; m:I  
  if(!bProcessed){ PWV+ M@  
   for(int index=0;index<MAX_KEY;index++){ iA4VT,  
    if(hCallWnd[index]==NULL) .B! L+M< [  
     continue; 3!Mb<W.3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) - v=ndJ.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 1`1Jn*|TI  
   } lrgvY>E0  
  } /GA-1cS_(  
 } 5r0Sl89J  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !MOcF5M  
} PkOtg[Z  
ZC&~InN  
BOOL InitHotkey() 9?|m ^  
{ .4!wp&  
 if(hHook!=NULL){ m~@Lt~LZs  
  nHookCount++; YCBUc<)  
  return TRUE; >qdRqy)DC  
 } +p-S36K~,7  
 else yg%T{hyzH  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); km}E&ao  
  if(hHook!=NULL) CbMClnF  
   nHookCount++; $cGV)[KWp@  
  return (hHook!=NULL); 'l1cuAP!+  
} InG<B,/W?  
BOOL UnInit() ^Uldyv/  
{ 6a6N$v"  
 if(nHookCount>1){ ?YM0VB,y  
  nHookCount--; g:>dF#  
  return TRUE; K14{c1  
 } xQ=L2pX  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ,f .#-  
 if(unhooked==TRUE){ kCKCJ }N  
  nHookCount=0; VKr oikz@]  
  hHook=NULL; &RlYw#*1.  
 } 6w0r)  
 return unhooked; aV n+@g<.  
} {z# W-  
PR>%@-Vgj  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) mTa^At"  
{ V/8yW3]Xy  
 BOOL bAdded=FALSE; w.Kp[  
 for(int index=0;index<MAX_KEY;index++){ w'Jo).OW~  
  if(hCallWnd[index]==0){ 6o GF6C  
   hCallWnd[index]=hWnd; g1q%b%8T  
   HotKey[index]=cKey; rgu7g  
   HotKeyMask[index]=cMask; M,eq-MEK  
   bAdded=TRUE; s`L>mRw`  
   KeyCount++; c`V~?]I>  
   break; M'xG.'  
  } Lw{'mtm  
 } HTP~5J  
 return bAdded; o&HFlDZ5jO  
} {"^#CSi  
=!2(7Nr  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 84-7!< 6i  
{ ld'Aaxl&  
 BOOL bRemoved=FALSE; E"%G@,|3*  
 for(int index=0;index<MAX_KEY;index++){ -\~x^5K  
  if(hCallWnd[index]==hWnd){ V[">SiOg  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _MGhG{p7t  
    hCallWnd[index]=NULL; Il#9t?/  
    HotKey[index]=0; n 4EZy<~m  
    HotKeyMask[index]=0; zj'uKBDl  
    bRemoved=TRUE; ;Z#DB$o\  
    KeyCount--; cK2Us+h  
    break; @xAfD{}f!  
   } "cX*GTNi8  
  } SZC1$..2T  
 } 5,?Au  
 return bRemoved; j=w`%nh4"f  
} qo0]7m7|  
q*{Dy1Tj  
void VerifyWindow() aEqDxr6  
{ -cWxS{vO  
 for(int i=0;i<MAX_KEY;i++){ n]%yf9,w  
  if(hCallWnd!=NULL){ E9S&UU,K  
   if(!IsWindow(hCallWnd)){ [3hOc/]s  
    hCallWnd=NULL; 2d-C}&}L\  
    HotKey=0; ht^xc c  
    HotKeyMask=0; rKWkT"  
    KeyCount--; Psu*t%nQ?A  
   } 24/ ^_Td  
  } 5I@2UvV8  
 } }5Pzen  
} qn@:A2e d  
2;=xH t  
BOOL CHookApp::InitInstance() <7sGA{  
{ !4 G9`>n  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); nK|WzUtp  
 hins=AfxGetInstanceHandle(); ZIM 5$JdCv  
 InitHotkey(); ?!kPW^gD  
 return CWinApp::InitInstance(); eMDraJv@  
} vh^,8pPy  
{KalVZX2R  
int CHookApp::ExitInstance() fwi( qx1=}  
{ u:D,\`;)  
 VerifyWindow(); i9k/X&V  
 UnInit(); .TetN}w  
 return CWinApp::ExitInstance(); SiQszV.&  
} ~m.@{Do0p  
nc.X+dx:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file / L/hR4  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3.s.&^  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ] 'ybu&22  
#if _MSC_VER > 1000 YV>]c9!q  
#pragma once yPza  
#endif // _MSC_VER > 1000 IPT\d^|f  
.`K<Iug1  
class CCaptureDlg : public CDialog |Ptv)D  
{ [.NG~ cpb  
 // Construction )R'~{;z }  
 public: ]J7.d$7T  
  BOOL bTray; V}kQXz"9  
  BOOL bRegistered; =%V(n{7=  
  BOOL RegisterHotkey(); BSB;0OM  
  UCHAR cKey; G\ht)7SGgf  
  UCHAR cMask; ~1v5H]T{  
  void DeleteIcon(); K=82fF(-  
  void AddIcon(); +1%7*2q,  
  UINT nCount; YCd[s[  
  void SaveBmp(); UL.x*@o  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ("B[P/  
  // Dialog Data WD7IF+v  
  //{{AFX_DATA(CCaptureDlg) qx~-(|s`H  
  enum { IDD = IDD_CAPTURE_DIALOG }; >FabmIcC  
  CComboBox m_Key; K`?",G?_  
  BOOL m_bControl; Q-}yZ  
  BOOL m_bAlt; {"uLV{d  
  BOOL m_bShift; %nfaU~IqK  
  CString m_Path; kq kj.#u  
  CString m_Number; %Z=%E!*  
  //}}AFX_DATA {FU,om9  
  // ClassWizard generated virtual function overrides [_h/Dh C:+  
  //{{AFX_VIRTUAL(CCaptureDlg) i7/I8y  
 public: 09SLQVo  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Bqd'2HQd  
 protected: :_FnQhzg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %`[Oz[V  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); KK%R3{  
  //}}AFX_VIRTUAL ;L458fYs  
  // Implementation T!*lTzNHm  
 protected: "ebm3t@C  
  HICON m_hIcon; V94eUmx>?+  
  // Generated message map functions A+&^As2  
  //{{AFX_MSG(CCaptureDlg) 9=J+5V^qD<  
  virtual BOOL OnInitDialog(); [Cx'a7KWL  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); LzW8)<N  
  afx_msg void OnPaint(); 0//?,'.  
  afx_msg HCURSOR OnQueryDragIcon(); K*_5M  
  virtual void OnCancel(); m ["`Op4  
  afx_msg void OnAbout(); V_T.#"C4=z  
  afx_msg void OnBrowse(); n@)Kf A)&  
  afx_msg void OnChange(); ~<?+(V^D  
 //}}AFX_MSG ,33[/j  
 DECLARE_MESSAGE_MAP() L:ox$RU  
}; $6ev K~  
#endif /uM;g9 m  
'*~_!lE5  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file |KHaL?  
#include "stdafx.h" `H.~ # $  
#include "Capture.h" WDC+Jmlgp  
#include "CaptureDlg.h" 4iD-jM_D  
#include <windowsx.h> N:]71+  
#pragma comment(lib,"hook.lib") Wz~=JvRHh  
#ifdef _DEBUG s?8vs%(l  
#define new DEBUG_NEW .I"Qu:``  
#undef THIS_FILE +EZ Lic  
static char THIS_FILE[] = __FILE__; .m&JRzzV  
#endif *t JgQ[  
#define IDM_SHELL WM_USER+1 gua +-##)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b V5{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Cz%tk}2  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; I0 78[3b  
class CAboutDlg : public CDialog &?R2zfcM  
{ .S l{m[nV8  
 public: \~]HfDu  
  CAboutDlg(); Z-fQ{&a{  
  // Dialog Data c&{1Z&Y  
  //{{AFX_DATA(CAboutDlg) .K=r.tf~  
  enum { IDD = IDD_ABOUTBOX }; ?+]prbt)  
  //}}AFX_DATA 3~I|KF7x  
  // ClassWizard generated virtual function overrides M?i U$qI  
  //{{AFX_VIRTUAL(CAboutDlg) gkJL=,  
 protected: QxSJLi7t  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support SM;*vkwz~  
  //}}AFX_VIRTUAL i: 6`Rmz1.  
  // Implementation $?.0>0 ,<  
 protected: yM *-e m  
  //{{AFX_MSG(CAboutDlg) @%7IZg;P6  
  //}}AFX_MSG ET_a>]<mv  
  DECLARE_MESSAGE_MAP() WU wH W  
}; 8!~8:?6n  
g[]UM;D*  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) N%hV+># Z  
{ 2qw-:  
 //{{AFX_DATA_INIT(CAboutDlg) Tq\S-K}4!  
 //}}AFX_DATA_INIT Fgf5OHX  
} 9w^lRbn  
3C,G~)= x  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) -|ho 8alF  
{ TY(B]Q_o  
 CDialog::DoDataExchange(pDX); raWs6b4Q  
 //{{AFX_DATA_MAP(CAboutDlg) ^PnXnH?  
 //}}AFX_DATA_MAP r\OunGUP  
} WIe7>wkC  
cBZK t  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) n9 LTrhLqp  
 //{{AFX_MSG_MAP(CAboutDlg) x)Y?kVw21"  
 // No message handlers iP7 Cku}l  
 //}}AFX_MSG_MAP 5s=ZA*(sY  
END_MESSAGE_MAP() @H{QHi  
NUlp4i~Q  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) D5o[z:V7"  
: CDialog(CCaptureDlg::IDD, pParent) S>-x<'Os  
{ Z*+0gJ<Y  
 //{{AFX_DATA_INIT(CCaptureDlg) i `m&X6)\j  
  m_bControl = FALSE; ?ztI8 I/  
  m_bAlt = FALSE; BB x359  
  m_bShift = FALSE; XX85]49`%  
  m_Path = _T("c:\\"); BGtr=&Hq  
  m_Number = _T("0 picture captured."); B6N/nCvHK  
  nCount=0; n{d0}N =  
  bRegistered=FALSE; #41xzN  
  bTray=FALSE; ^#|Sl D]  
 //}}AFX_DATA_INIT $pKlF0 .  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 /6=IL  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); UZ5O%SF  
} skd3E4  
Q[j'FtP%  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) e -!6m #0  
{ `D44I;e^1;  
 CDialog::DoDataExchange(pDX); q*L>MV  
 //{{AFX_DATA_MAP(CCaptureDlg) (Dy6I;S  
  DDX_Control(pDX, IDC_KEY, m_Key); U$*AV<{%   
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Jy#c 6  
  DDX_Check(pDX, IDC_ALT, m_bAlt); dRdI('  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); bW]7$?acv  
  DDX_Text(pDX, IDC_PATH, m_Path); HE;}B!>  
  DDX_Text(pDX, IDC_NUMBER, m_Number); iyA=d{S;V  
 //}}AFX_DATA_MAP L701j.7"  
} 50s1o{xwc  
rr@h9bak;g  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Vu0d\l^$  
//{{AFX_MSG_MAP(CCaptureDlg) M id v  
 ON_WM_SYSCOMMAND() yQT cO^E  
 ON_WM_PAINT() u|ph_?6 o  
 ON_WM_QUERYDRAGICON() 1zGD~[M  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) O$qxo &  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) C+0MzfLgf  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 8t1XZ  
//}}AFX_MSG_MAP S55h}5Y  
END_MESSAGE_MAP() \;!}z3Ww  
J?wCqA  
BOOL CCaptureDlg::OnInitDialog() h23"<  
{ TpAE9S  
 CDialog::OnInitDialog(); fH@P&SX  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ty"|yA  
 ASSERT(IDM_ABOUTBOX < 0xF000); WE{fu{x  
 CMenu* pSysMenu = GetSystemMenu(FALSE); XIGz_g;#'w  
 if (pSysMenu != NULL) H*m3i;"4p\  
 { B\73 Vf  
  CString strAboutMenu; kB)u@`</mV  
  strAboutMenu.LoadString(IDS_ABOUTBOX); R@X65o  
  if (!strAboutMenu.IsEmpty()) 'o8,XBv-  
  { =xH>,-8}  
   pSysMenu->AppendMenu(MF_SEPARATOR); \u/=?b  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); N>j*{]OY+{  
  } *MWI`=c  
 }  OtZtl* 5  
 SetIcon(m_hIcon, TRUE); // Set big icon !cO<N~0*5x  
 SetIcon(m_hIcon, FALSE); // Set small icon i&}LuF8  
 m_Key.SetCurSel(0); Ox aS<vQ3  
 RegisterHotkey(); wxG*mOw  
 CMenu* pMenu=GetSystemMenu(FALSE); ^sJp!hi4=)  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); U|+`Eth8(  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ccW{88II7w  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4l{La}Aj  
 return TRUE; // return TRUE unless you set the focus to a control fhHTp_u)2  
} P6'0:M@5  
=lh&oPc1  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) JS >"j d#  
{ ~W gO{@Mw  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) &4p~i Z  
 { ?G5,x  
  CAboutDlg dlgAbout; %CrpUx  
  dlgAbout.DoModal(); O4W 2X@  
 } XQ Si  
 else X=k|SayE8  
 { X*r?@uK5  
  CDialog::OnSysCommand(nID, lParam); z)&&Ym#  
 } ]V"B`ip[2  
} U`4t4CHA  
)d5mZE!3  
void CCaptureDlg::OnPaint() JkNRXC:  
{ OH5#.${O  
 if (IsIconic()) - :x6X$=  
 { Pv$O=N6-  
  CPaintDC dc(this); // device context for painting #/K71Y  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); wD<W'K   
  // Center icon in client rectangle f./j%R@  
  int cxIcon = GetSystemMetrics(SM_CXICON); cn ;2&  
  int cyIcon = GetSystemMetrics(SM_CYICON); ;sSRv9Xb  
  CRect rect; \D! I"mr  
  GetClientRect(&rect); {f>e~o  
  int x = (rect.Width() - cxIcon + 1) / 2; ]"vpCL  
  int y = (rect.Height() - cyIcon + 1) / 2; nlx~yUXL4  
  // Draw the icon d:n .Vp  
  dc.DrawIcon(x, y, m_hIcon); I\6^]pi,  
 } B{Lzgw u;  
 else L<N=,~  
 { o PA m*  
  CDialog::OnPaint(); s.!gsCQme  
 } VC NQ}h[D  
} @%As>X<3t  
,xC@@>f  
HCURSOR CCaptureDlg::OnQueryDragIcon() =NL(L  
{ b U>.Bp]  
 return (HCURSOR) m_hIcon; :W1B"T<  
} 6.QzT(  
@w[HXb  
void CCaptureDlg::OnCancel() bjs{_?  
{ ~$ "P\iJ  
 if(bTray) * @'N/W/8  
  DeleteIcon(); wEb10t,  
  CDialog::OnCancel(); O>2i)M-h9x  
} <SNu`,/I  
,S=ur%  
void CCaptureDlg::OnAbout() Md1ePp]  
{ a"X9cU[  
 CAboutDlg dlg; CF@j]I@{   
 dlg.DoModal(); ]hi5 nA  
} kt hy9<!$  
m2PI^?|e  
void CCaptureDlg::OnBrowse() `9p;LZC1K  
{ V5HK6-T  
 CString str; 'u4TI=[6  
 BROWSEINFO bi; .d%CD`8!  
 char name[MAX_PATH]; @7,k0H9Moa  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); t\\`#gc9~i  
 bi.hwndOwner=GetSafeHwnd(); Ouc$M2m0!  
 bi.pszDisplayName=name; &BJ"T  
 bi.lpszTitle="Select folder"; %8g1h)F"S  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 7F wo t&  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 05o 1  
 if(idl==NULL) CR'1,  
  return; j q1 |`:  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >Y"Ru#Ju9  
 str.ReleaseBuffer(); pu6@X7W"  
 m_Path=str; pK@8= +  
 if(str.GetAt(str.GetLength()-1)!='\\') i}r|Zo  
  m_Path+="\\"; ORo,.#<  
 UpdateData(FALSE); - 1tiy.^$F  
} UrEfFtH'  
rl](0"Y0 t  
void CCaptureDlg::SaveBmp() 6Y&`mgMF'  
{ J`d;I#R%c  
 CDC dc; ._US8  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); +I r  
 CBitmap bm; C7 T}:V](q  
 int Width=GetSystemMetrics(SM_CXSCREEN); xg_9#  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5? 1:RE(1  
 bm.CreateCompatibleBitmap(&dc,Width,Height); &`Ek-b!7  
 CDC tdc; =^`?O* /;  
 tdc.CreateCompatibleDC(&dc); O p,_d^  
 CBitmap*pOld=tdc.SelectObject(&bm); |t uh/e@dx  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); i5jsM\1j  
 tdc.SelectObject(pOld); 2N[/Cc2Tg/  
 BITMAP btm; q2~@z-q)b  
 bm.GetBitmap(&btm); XMw*4j2E  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; >K-S&Y  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); qv.s-@l8  
 BITMAPINFOHEADER bih; 3DS&-rN  
 bih.biBitCount=btm.bmBitsPixel; )lrmP(C*.a  
 bih.biClrImportant=0; wOs t).  
 bih.biClrUsed=0; I7e.p m  
 bih.biCompression=0; .FpeVjR''  
 bih.biHeight=btm.bmHeight; \*5${[  
 bih.biPlanes=1; 8t >nL  
 bih.biSize=sizeof(BITMAPINFOHEADER); %{;1i  
 bih.biSizeImage=size; 7 HM%Cd  
 bih.biWidth=btm.bmWidth; 7FGi+  
 bih.biXPelsPerMeter=0; ![j?/376  
 bih.biYPelsPerMeter=0; IcP\#zhEv  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ME.a * v  
 static int filecount=0; fv/Nf"  
 CString name; bfX yuv  
 name.Format("pict%04d.bmp",filecount++); Yh2[ nF_  
 name=m_Path+name; @p ZjJ<9QM  
 BITMAPFILEHEADER bfh; ZGj ^,?a  
 bfh.bfReserved1=bfh.bfReserved2=0; Bvsxn5z+:  
 bfh.bfType=((WORD)('M'<< 8)|'B'); _T\cJcWf  
 bfh.bfSize=54+size; )J{ .z   
 bfh.bfOffBits=54; chA7R'+LA  
 CFile bf; Xli$4 uL   
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ a|eHo%Qt  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); VMIX=gTZ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 7-#   
  bf.WriteHuge(lpData,size); p(Ux]_s%  
  bf.Close(); \45F;f_r6  
  nCount++; bYAtUEv  
 } .W s\%S  
 GlobalFreePtr(lpData); b|oT!s  
 if(nCount==1) #gsJ tT9  
  m_Number.Format("%d picture captured.",nCount); cPy/}A  
 else "."ow|  
  m_Number.Format("%d pictures captured.",nCount); 7!U^?0?/  
  UpdateData(FALSE); #g=  
} |ya.c\}q  
ohna1a^  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) qsWy <yL+  
{ SNtk1pG>  
 if(pMsg -> message == WM_KEYDOWN) <NWq0 3:&  
 { M>[e1y>7  
  if(pMsg -> wParam == VK_ESCAPE) z"P/Geb:O  
   return TRUE; `3yK<-  
  if(pMsg -> wParam == VK_RETURN) U*4r<y9R  
   return TRUE; sm"s2Ci=}  
 } ,0a\Ka {^  
 return CDialog::PreTranslateMessage(pMsg); DS=$* Trk  
} nvQTJ4,,  
l"-Z#[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) o$Ju\(Y$<+  
{ m~0Kos%^*b  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ! k 1 Ge+  
  SaveBmp(); d}Q% I  
  return FALSE; pO92cGJ8  
} LU/;` In  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ EpH_v`  
 CMenu pop; f@[qS7ok  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); R$X~d8o>%  
 CMenu*pMenu=pop.GetSubMenu(0); O,JS*jXl  
 pMenu->SetDefaultItem(ID_EXITICON); GZ^Qt*5 {  
 CPoint pt; }OY/0p-Z  
 GetCursorPos(&pt); X ,{ 3_  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ALj~e#{;z  
 if(id==ID_EXITICON) BP}@E$  
  DeleteIcon(); TV=K3F5)M  
 else if(id==ID_EXIT) McpQ7\*h  
  OnCancel(); ocu,qL)W  
 return FALSE; m?kyAW'|  
} B"8jEYT5  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); T'{9!By,P  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) k/(]1QnW  
 AddIcon(); NfUt\ p*  
 return res; #q 4uS~  
} d f!i}L  
^t:dcY7  
void CCaptureDlg::AddIcon() 2RQ- L  
{ Wy%FF\D.Y  
 NOTIFYICONDATA data; 6$[7hlE  
 data.cbSize=sizeof(NOTIFYICONDATA); `Qjs {H  
 CString tip; rr,w/[  
 tip.LoadString(IDS_ICONTIP); xHMFYt+0$G  
 data.hIcon=GetIcon(0); R0%M9;>1  
 data.hWnd=GetSafeHwnd(); 4(p`xdr}K  
 strcpy(data.szTip,tip); 2vWn(6`  
 data.uCallbackMessage=IDM_SHELL; Q8MIpa!:  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 0(*L)s,5  
 data.uID=98; f7y.##WG  
 Shell_NotifyIcon(NIM_ADD,&data); v2_` iwE  
 ShowWindow(SW_HIDE); J#t-." f6^  
 bTray=TRUE; A; wT`c  
} UWidT+'Sa  
J ZkQ/vp(  
void CCaptureDlg::DeleteIcon() LT"H -fTgs  
{ tj$[szo  
 NOTIFYICONDATA data; s&Y"a,|Z  
 data.cbSize=sizeof(NOTIFYICONDATA); kg 8Dn  
 data.hWnd=GetSafeHwnd(); <Se9 aD  
 data.uID=98; \5 rJ  
 Shell_NotifyIcon(NIM_DELETE,&data); M~N/er  
 ShowWindow(SW_SHOW); SnR2o3r-Of  
 SetForegroundWindow(); U (#JC(E-#  
 ShowWindow(SW_SHOWNORMAL); X =%8*_  
 bTray=FALSE; 7f4O~4.[i  
} :eSsqt9]9  
$rI 1|;^  
void CCaptureDlg::OnChange() Fn7OmxfD  
{ Qn,6s%n  
 RegisterHotkey(); _&/ {A|n  
} a6-.|tt#t  
Px&_6}YWy  
BOOL CCaptureDlg::RegisterHotkey() 1I{8 |  
{ "i\#L`TkzX  
 UpdateData(); A&bj l[s  
 UCHAR mask=0; |-G2pu;  
 UCHAR key=0; 4e Y?#8  
 if(m_bControl) !nCq8~#  
  mask|=4; N -]/MB 8  
 if(m_bAlt) #,u|*O:  
  mask|=2; [ r8 ZAS  
 if(m_bShift) U!`iKy-  
  mask|=1; B+snHabS6  
  key=Key_Table[m_Key.GetCurSel()]; !TJ,:c]4{!  
 if(bRegistered){ 0'fswa)  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); XS">`9o!  
  bRegistered=FALSE; [d8Q AO1;)  
 } RGE(#   
 cMask=mask; {X&lgj  
 cKey=key; YT Zi[/  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); o]Rlivahm  
 return bRegistered; qQi\/~Y[:  
} 4] uj+J  
eM:J_>7t  
  四、小结 6oNcj_?7?q  
~e 1l7H;  
  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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