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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: 2W2T  
  I$MlIz$l v  
  一、实现方法 y$9! rbL  
3H0B+F2XQ  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: PfyJJAQ[  
j ijwHL  
#pragma data_seg("shareddata") YWs?2I  
HHOOK hHook =NULL; //钩子句柄 :Nv7Wt!  
UINT nHookCount =0; //挂接的程序数目 ]-9w'K d  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 |j81?4<)v  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 MB7*AA;  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey -Lu&bVt<>  
static int KeyCount =0; T9XUNR{&  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 .xuzu#-  
#pragma data_seg() jRd$Vt  
/&<V5?1|  
  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。 !/!ga)Y  
_6V1oe2  
  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: iEZ+Znon  
]<C]`W2{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR c#>(8#'.U  
cKey,UCHAR cMask) vS)>g4  
{ 1;H"4u_IG&  
 BOOL bAdded=FALSE; -jy0Kl/p  
 for(int index=0;index<MAX_KEY;index++){ T=)qD2?  
  if(hCallWnd[index]==0){ Dk>6PBl  
   hCallWnd[index]=hWnd; ".%d{z}vz  
   HotKey[index]=cKey; -- FzRO{D  
   HotKeyMask[index]=cMask; !><asaB]1  
   bAdded=TRUE; +'-.c"  
   KeyCount++; vg5_@7  
   break; ;kY~-Om  
  } 3 z(4axH'  
 } "TJ*mN.i{}  
 return bAdded; mLpM8~L  
} 92t.@!m`  
//删除热键 -fl6M-CYX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) bc4V&  
{ ]d-.Mw,'  
 BOOL bRemoved=FALSE; o{! :N>(  
 for(int index=0;index<MAX_KEY;index++){ ! xG*W6IT  
  if(hCallWnd[index]==hWnd){ as|w} $  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ PCHspe9!y  
    hCallWnd[index]=NULL; pA8As  
    HotKey[index]=0; W>i"p~!  
    HotKeyMask[index]=0; ];4!0\M  
    bRemoved=TRUE; U: Wet,  
    KeyCount--; YcX\t6VK  
    break; 4l%1D.3-O  
   } w3ni@'X8  
  } !& >`  
 }  u\L}B!  
 return bRemoved; q :TNf\/o  
} pm,xGo2  
8\!E )M|4  
%^HE^ &  
  DLL中的钩子函数如下: fO&`A:JY  
y:}qoT_.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) TKv!wKI  
{ uBa<5YDF  
 BOOL bProcessed=FALSE; N{S) b  
 if(HC_ACTION==nCode) p/?o^_s  
 { 8"9&x} tl-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 F{!pii5O9  
   switch(wParam) w\YS5!P,V  
   {  ,d,2Q  
    case VK_MENU: Xs2 jR14`  
     MaskBits&=~ALTBIT; a \1QnCy  
     break; %Qlc?Wl:  
    case VK_CONTROL: %:d7Ts&?Z  
     MaskBits&=~CTRLBIT; h7!O K  
     break; T1 $E][@Iv  
    case VK_SHIFT: p>;@]!YWQ  
     MaskBits&=~SHIFTBIT; =I546($  
     break; (+epRC  
    default: //judge the key and send message 7!pKlmQ  
     break; DJL.P6-W  
   } $VvgzjrH  
   for(int index=0;index<MAX_KEY;index++){ 'v~'NWfd  
    if(hCallWnd[index]==NULL) PnA{@n\  
     continue; JRo/ HY+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `.@sux!lu  
    { 0DmA3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .{h"0<x  
     bProcessed=TRUE; BZ?Ck[E]Z  
    } 5M~{MdF|.  
   } `a4&_`E,p  
  } PY.K_(D  
  else if((lParam&0xc000ffff)==1){ //有键按下 hOU H1m.  
   switch(wParam) 'UIFP#GtFO  
   { o5tCbsHj-  
    case VK_MENU: MhD'  
     MaskBits|=ALTBIT; "mW'tm1+  
     break; oNAnJ+_  
    case VK_CONTROL: 2URGd#{VQ  
     MaskBits|=CTRLBIT; &Mk!qE<:N  
     break; ]=q auf>3  
    case VK_SHIFT: _TOWqV^  
     MaskBits|=SHIFTBIT; J8alqs7  
     break; );7 d_#  
    default: //judge the key and send message ,G t!nm_  
     break; QDg5B6>$  
   } @@Ybg6.+*  
   for(int index=0;index<MAX_KEY;index++){ 'K?h6?#  
    if(hCallWnd[index]==NULL) A-CU%G9  
     continue; tb+gCs'D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Fvl\.  
    { S{+t>en  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); X3:z=X&Zd  
     bProcessed=TRUE; szsVk#p  
    } w*VN =  
   } ,=u;1  
  } c,~uurVi  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 .*-8rOcc  
   for(int index=0;index<MAX_KEY;index++){ j ~-N2b6z  
    if(hCallWnd[index]==NULL) u?Ffqt9'  
     continue; ?'MkaG0g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) '@t$3 hk  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); UA6id|G  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 aj&L ZDD6  
   } q`c!!Lg  
  } Z6Fu~D2U y  
 } OX7=g$S 1  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); yW|J`\`^T  
} b w P=f.  
F/s n"2  
  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: H -Mb:4  
>3uNh:|>/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N#T'}>ty  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u9hd%}9Qd?  
s:3[#&PQpN  
  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: M&V'*.xz  
|(>`qL{|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6m:$mhA5  
{ tAAMSb9[d  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ..)J6L5l  
 { /+Z*)q+SbT  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 :<J7g`f  
  SaveBmp(); f$C{Z9_SX  
  return FALSE; xe!bfzU  
 } 6gV*G  
 …… //其它处理及默认处理 o}rG:rhIh  
} ~[ufL25K  
cpdESc9W  
nI*.(+h  
  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。 k*$WAOJEW  
!D??Y^6bI  
  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。 ` B)@  
I&1Lm)W&  
  二、编程步骤 I1<WHq  
=^4Z]d  
  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"; <s9{o uZ  
7f>=-sv  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; [neuwdN  
y:;.r:  
  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; g:Hj1!'  
v;]rFc#Px[  
  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; P<PZ4hNx  
ALMsF2H  
  5、 添加代码,编译运行程序。 |:eTo<  
F 3|^b{'zO  
三、程序代码 =[( 34#  
&QHJ%c  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL j, 0`k  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) )~U1sW&t  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ X1@DI_  
#if _MSC_VER > 1000 |}=eY?iXo  
#pragma once "_WN[jm  
#endif // _MSC_VER > 1000 #3&@FzD_P  
#ifndef __AFXWIN_H__ =CLPz8  
#error include 'stdafx.h' before including this file for PCH "hk# pQ  
#endif e*:K79 y  
#include "resource.h" // main symbols |v!N1+v0  
class CHookApp : public CWinApp QOWGQl%!  
{ Bj@>iw?g'  
 public: $.`o  
  CHookApp(); ER"69zQg|2  
  // Overrides ofy"SM  
  // ClassWizard generated virtual function overrides CWdsOS=  
  //{{AFX_VIRTUAL(CHookApp) T fLqxioqZ  
 public: J"r?F0  
  virtual BOOL InitInstance(); (D>_O$o  
  virtual int ExitInstance(); V^_A{\GK  
  //}}AFX_VIRTUAL {-Y;!  
  //{{AFX_MSG(CHookApp) :iE b^F}  
  // NOTE - the ClassWizard will add and remove member functions here. `ASDUgx Mq  
  // DO NOT EDIT what you see in these blocks of generated code ! JK/{Ik F  
  //}}AFX_MSG :;{M0  
  DECLARE_MESSAGE_MAP() Btm,'kBG  
}; 9j 2t|D4uT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); @c|=onx5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2) X#&IE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .6wPpLG?{  
BOOL InitHotkey(); \g}]u(zg%  
BOOL UnInit(); U6.aoqb%  
#endif &4?&tGi  
z!}E2j_9P  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. )?rq8VO  
#include "stdafx.h" B>2R-pa4~  
#include "hook.h" Q"&Mr+  
#include <windowsx.h> V*?cMJ_G  
#ifdef _DEBUG F^%w%E\  
#define new DEBUG_NEW _b&|0j:Ud  
#undef THIS_FILE ~,)jZ-fw  
static char THIS_FILE[] = __FILE__; 6W i n!4  
#endif d/d)MoaJ*t  
#define MAX_KEY 100 h P6f   
#define CTRLBIT 0x04 B;9,Qbb  
#define ALTBIT 0x02 !l[;,l   
#define SHIFTBIT 0x01 F[ E'R.:  
#pragma data_seg("shareddata") '@{:Fr G*U  
HHOOK hHook =NULL; io#}z4"'qY  
UINT nHookCount =0; KIF9[/P  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 7b"fpB  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT | eBwcC#^  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey `J.,dqGb  
static int KeyCount =0; Sdq}?-&Sa  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift  [Sm<X  
#pragma data_seg() t'44X  
HINSTANCE hins; <6Q^o[L  
void VerifyWindow(); a#p+.)Wm  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ,.)wCZ,wca  
//{{AFX_MSG_MAP(CHookApp) Z)rW>I  
// NOTE - the ClassWizard will add and remove mapping macros here. x{R440"  
// DO NOT EDIT what you see in these blocks of generated code! Olzw)WjG  
//}}AFX_MSG_MAP E+L7[  
END_MESSAGE_MAP() @\by`3*Q  
xFu ,e  
CHookApp::CHookApp() 0z=KnQx"4  
{ tJ(xeb  
 // TODO: add construction code here, owNwj  
 // Place all significant initialization in InitInstance k(ouE|B  
} ^>|ZN2  
bDl:,7;  
CHookApp theApp; /M2in]oH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) K=f4<tP_  
{ Clf$EX;~  
 BOOL bProcessed=FALSE; b**vUt\  
 if(HC_ACTION==nCode) =R5W KX  
 { yY$^ R|t  
  if((lParam&0xc0000000)==0xc0000000){// Key up | Y:`>2ev  
   switch(wParam) UQ0!tFx  
   { 4=,J@N-  
    case VK_MENU: !u7KgB<=/F  
     MaskBits&=~ALTBIT; !9d7wPUFr  
     break; +g1>h ,K 3  
    case VK_CONTROL: H!;N0",]N  
     MaskBits&=~CTRLBIT; oG,>Pk  
     break; O=Su E/q  
    case VK_SHIFT: y [Vd*8  
     MaskBits&=~SHIFTBIT; +<E#_)}`D6  
     break; P'~`2W0sz  
    default: //judge the key and send message >2#<gp3  
     break; e r3M vw  
   } 6))":<J  
   for(int index=0;index<MAX_KEY;index++){ _T)y5/[  
    if(hCallWnd[index]==NULL) ?_H9>/:.  
     continue; OX"Na2-el  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /d&m#%9Up]  
    { x1:mT[[$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); P-X|qVNK1Z  
     bProcessed=TRUE; I9kz)Q o  
    } {a[BhK'g  
   } TuwP'g[  
  } 'n|U   
  else if((lParam&0xc000ffff)==1){ //Key down Y}[<KK}_  
   switch(wParam) e'mF1al  
   { \Z5Wp5az},  
    case VK_MENU: wUvE  
     MaskBits|=ALTBIT; jIKg* @  
     break; n@pwOHQn<|  
    case VK_CONTROL: ed'[_T}T3t  
     MaskBits|=CTRLBIT; c]pz&  
     break; QQAEG#.5  
    case VK_SHIFT: "%T~d[M  
     MaskBits|=SHIFTBIT; W^<AUT  
     break; U5"u h} 3  
    default: //judge the key and send message "kApGNB  
     break; 8u*<GbKGI  
   } z83v J*.  
   for(int index=0;index<MAX_KEY;index++) a?gF;AYk  
   { 9~V'Wev  
    if(hCallWnd[index]==NULL) !*l/Pr^8  
     continue; }Y-V!z5z!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) s#7"ZN  
    { #IH9S5B [  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); NDRD PD  
     bProcessed=TRUE; |lhnCShw  
    } (MXy\b<  
   } Oti;wf G7o  
  } W B:0}b0Gu  
  if(!bProcessed){ xh;gAh5n  
   for(int index=0;index<MAX_KEY;index++){ W'6DwV|  
    if(hCallWnd[index]==NULL) !oyo_h  
     continue; 0YoKSo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) v7(7WfqP  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;Tbo \Wp9  
   }  ]]p\1G  
  } *k(FbZ  
 } S$b)X"h  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 8*-)[+s9il  
} bg~CV&]M  
hP:>!KJ  
BOOL InitHotkey() u-~ec{oBu  
{ DVd8Ix<  
 if(hHook!=NULL){ ";.j[p:gi  
  nHookCount++; Hec8pL  
  return TRUE; WSpF/Wwc  
 } -UEi  
 else _sy{rnaqvb  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 4`?PtRX  
  if(hHook!=NULL) 5=;cN9M@  
   nHookCount++; |ts0j/A]Pi  
  return (hHook!=NULL); ]{=y8]7  
} -gGw_w?)(  
BOOL UnInit() M2%@bETJ  
{ jNxTy UU  
 if(nHookCount>1){ =*fq5v  
  nHookCount--; #GGa,@O  
  return TRUE; xn, u$@F  
 } 0=,Nz  
 BOOL unhooked = UnhookWindowsHookEx(hHook); X !h>13fW  
 if(unhooked==TRUE){ !$98 U~L  
  nHookCount=0; { {?-& yA  
  hHook=NULL; w!UF^~  
 } KY&Lv^1_|  
 return unhooked; |}{gE=]  
} X!g;;DB\  
?[#w*Am7  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) TJYhgna  
{ W$]qo|2P  
 BOOL bAdded=FALSE; 8`S1E0s  
 for(int index=0;index<MAX_KEY;index++){ W9l ](Ow  
  if(hCallWnd[index]==0){ ;tQc{8O6L  
   hCallWnd[index]=hWnd; <IWg]AJT :  
   HotKey[index]=cKey; bR3Crz(9G  
   HotKeyMask[index]=cMask; i).Vu}W#S  
   bAdded=TRUE; ((Av3{05H&  
   KeyCount++; 'LoWp} f9  
   break; dQ;8,JzIw&  
  } Dt!KgI3  
 } $mK;{9Z  
 return bAdded; z1b@JCWE  
} ~g{1lcqQP  
8$c) ]Bv  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) iUz?mt;k  
{ KsGW@Ho:  
 BOOL bRemoved=FALSE; vcW(?4e  
 for(int index=0;index<MAX_KEY;index++){ In4VS:dD  
  if(hCallWnd[index]==hWnd){ 7zzFM  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %KF I~Qk  
    hCallWnd[index]=NULL; b7hICO-w  
    HotKey[index]=0; pIR_2Eq  
    HotKeyMask[index]=0; 2r2:  
    bRemoved=TRUE; %V;* E]  
    KeyCount--; 'WHI.*=  
    break; p+Q9?9  
   } nt"\FZ*;3  
  } Fr50hrtkU  
 } mfj%-)l9  
 return bRemoved; `i|!wD,=\  
} ")9^  
<:AA R2=  
void VerifyWindow() w nBvJb]4l  
{ #[i3cn  
 for(int i=0;i<MAX_KEY;i++){ h>>~Bi  
  if(hCallWnd!=NULL){ -5v{p  
   if(!IsWindow(hCallWnd)){ @u$NB3  
    hCallWnd=NULL; l`#rhuy`  
    HotKey=0; 7 2i&-`&4  
    HotKeyMask=0; 3\ ]j4*i!  
    KeyCount--; xrXfZ>$5bM  
   } ^PC;fn,I  
  } cY+fZ=  
 } x _kT Wq  
} Z;NaIJiL-  
Eve,*ATI  
BOOL CHookApp::InitInstance() 43g1/,klm  
{ Dy5&-yk  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); EPwU{*F  
 hins=AfxGetInstanceHandle(); N G vb]  
 InitHotkey(); 3rMi:*?  
 return CWinApp::InitInstance(); 7[ n |3  
} g?iZ RM  
Gv]94$'J9  
int CHookApp::ExitInstance() <k3KCt  
{ >;"%Db  
 VerifyWindow(); ;TC]<N.YJT  
 UnInit(); [ Y{  
 return CWinApp::ExitInstance(); SnX)&>B  
} P_H2[d&/>D  
o+{7"Na8[  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^r<l#D,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) &hZ.K"@7{  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ mz x$(u  
#if _MSC_VER > 1000 [xb'73  
#pragma once t%,:L.?J#  
#endif // _MSC_VER > 1000 p<pGqW  
bz 7?F!  
class CCaptureDlg : public CDialog OZz/ip-!lc  
{ Zcw <USF8  
 // Construction fHwS12SB  
 public: "PS ) "t  
  BOOL bTray; 5{!"}  
  BOOL bRegistered; YHY*dk*|C  
  BOOL RegisterHotkey(); yzl}!& E  
  UCHAR cKey; )b%zYD9p  
  UCHAR cMask; QxbG-B^)=  
  void DeleteIcon(); x8c>2w;6x^  
  void AddIcon(); [j TU nP  
  UINT nCount; (QojIdHt  
  void SaveBmp(); 6)ysiAH?  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Kc@Sw{JR#7  
  // Dialog Data 0,&] 2YJ  
  //{{AFX_DATA(CCaptureDlg) ,jW a&7  
  enum { IDD = IDD_CAPTURE_DIALOG }; #y"LFoJn  
  CComboBox m_Key; UCj<FN `  
  BOOL m_bControl; `|&0j4(Pg  
  BOOL m_bAlt; @o1#J` rv  
  BOOL m_bShift; UHk)!P>  
  CString m_Path;  `2\:b^h  
  CString m_Number; 4M0p:Ey '  
  //}}AFX_DATA RkTYvAk|kY  
  // ClassWizard generated virtual function overrides '"c`[L7Wn  
  //{{AFX_VIRTUAL(CCaptureDlg) x <aR|r  
 public: _V8;dv8  
  virtual BOOL PreTranslateMessage(MSG* pMsg); -glGOTk  
 protected: I!(BwYd  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ttB>PTg#  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); *2.h*y'u  
  //}}AFX_VIRTUAL hhWy-fP#  
  // Implementation \QG2V$  
 protected: }G^'y8U  
  HICON m_hIcon; m$hkmD|  
  // Generated message map functions '~7zeZ'  
  //{{AFX_MSG(CCaptureDlg) -2u)orWP  
  virtual BOOL OnInitDialog(); h3GUFiZ.  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); zmu+un"\j  
  afx_msg void OnPaint(); u|\?6fz  
  afx_msg HCURSOR OnQueryDragIcon(); \J#&]o)Y  
  virtual void OnCancel(); FI$ -."F  
  afx_msg void OnAbout(); Hj`\Fm*A  
  afx_msg void OnBrowse(); sV0NDM0  
  afx_msg void OnChange(); 9; 9ge  
 //}}AFX_MSG VV 54$a  
 DECLARE_MESSAGE_MAP() @.)[U:N  
}; tv~Y5e&8  
#endif py%~Qz%  
CGb4C(%-7  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ZzQLbCV  
#include "stdafx.h" WWOt>C~zV  
#include "Capture.h" 3xdJ<Lrq  
#include "CaptureDlg.h" `|v/qk7 ^?  
#include <windowsx.h> p&4n"hC  
#pragma comment(lib,"hook.lib") .A_R6~::  
#ifdef _DEBUG 9KJ}A i  
#define new DEBUG_NEW 4pelIoj  
#undef THIS_FILE %.'oY%  
static char THIS_FILE[] = __FILE__; XIdC1%pr;  
#endif ( *K)D$y  
#define IDM_SHELL WM_USER+1 ,&fZo9J9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3` D['  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); gNDMJ^`  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; p=kt+H&;  
class CAboutDlg : public CDialog Tdz#,]Q   
{ AGO"),  
 public: ufw[Ei$I:  
  CAboutDlg(); cW"DDm g  
  // Dialog Data jP2#w{xq  
  //{{AFX_DATA(CAboutDlg) |b^UPrz)VS  
  enum { IDD = IDD_ABOUTBOX }; $A/?evJi8R  
  //}}AFX_DATA }s6Veosl  
  // ClassWizard generated virtual function overrides |YV> #l  
  //{{AFX_VIRTUAL(CAboutDlg) e"{"g[b/7  
 protected: {^:NII]  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Di}M\!-[  
  //}}AFX_VIRTUAL JY;u<xl  
  // Implementation SXvflr] =m  
 protected: 3u+i  
  //{{AFX_MSG(CAboutDlg) O,v C:av  
  //}}AFX_MSG T{-gbo`Yji  
  DECLARE_MESSAGE_MAP() 1,]FLsuy  
}; W!Hn`T   
V\]j^$  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @t*D<B$  
{ ukc 7Z OQ  
 //{{AFX_DATA_INIT(CAboutDlg) Tow!5VAM  
 //}}AFX_DATA_INIT j+q)  
} cD)9EFo  
H5 :,hrZY  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) WU@_aw[  
{ <r>Sj /w<D  
 CDialog::DoDataExchange(pDX); WiQVZ {  
 //{{AFX_DATA_MAP(CAboutDlg) o1*P|.`  
 //}}AFX_DATA_MAP 3p?nQ O)L  
} +9pock  
DnG9bVm>  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) z}Us+>z+jc  
 //{{AFX_MSG_MAP(CAboutDlg) #T{)y  
 // No message handlers F+ RE  
 //}}AFX_MSG_MAP b35 3+7"|  
END_MESSAGE_MAP() X=lsuKREZ  
i3d 2+N`  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 0w< ilJ  
: CDialog(CCaptureDlg::IDD, pParent) sX3qrRY  
{ L$+_  
 //{{AFX_DATA_INIT(CCaptureDlg) ;O{bF8 U  
  m_bControl = FALSE; h+Yd \k  
  m_bAlt = FALSE; oR,zr  
  m_bShift = FALSE; _iEnS4$A8  
  m_Path = _T("c:\\"); "O|.e`C%^  
  m_Number = _T("0 picture captured."); | WTWj  
  nCount=0; .jC5 y&  
  bRegistered=FALSE; kt\,$.v8  
  bTray=FALSE; b?lRada{I  
 //}}AFX_DATA_INIT E`hR(UL ?  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 HVhd#Q;  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); UugR  
} 'Nuy/\[{\  
P{:Zxli0  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) w:iMrQeJg  
{ r ?<kWR?w  
 CDialog::DoDataExchange(pDX); ?,+&NX3m  
 //{{AFX_DATA_MAP(CCaptureDlg) 'jO8C2Th%  
  DDX_Control(pDX, IDC_KEY, m_Key); l]Xbd{  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); B4*y-Q.*  
  DDX_Check(pDX, IDC_ALT, m_bAlt); j{2 0  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); nt-_)4Fm  
  DDX_Text(pDX, IDC_PATH, m_Path); r:E4Wi{\  
  DDX_Text(pDX, IDC_NUMBER, m_Number); }[drR(]`dO  
 //}}AFX_DATA_MAP _8F;-7Sz  
} KsK]y,^Z  
;3xi.^=B  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) gy~2LY!}  
//{{AFX_MSG_MAP(CCaptureDlg) `-R&4%t%  
 ON_WM_SYSCOMMAND() v}D0t]  
 ON_WM_PAINT() *QI Yq  
 ON_WM_QUERYDRAGICON() w Jp1Fl~  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) h x8pg,X  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Tp.]{*  
 ON_BN_CLICKED(ID_CHANGE, OnChange) .3VL  
//}}AFX_MSG_MAP e>.^RtDF  
END_MESSAGE_MAP() |cp_V  
eH!V%dX  
BOOL CCaptureDlg::OnInitDialog() {D :WXvI  
{ !<VP[%2L~  
 CDialog::OnInitDialog(); 2Ub-ufkU  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Li0+%ijM  
 ASSERT(IDM_ABOUTBOX < 0xF000); \/gf_R_GN  
 CMenu* pSysMenu = GetSystemMenu(FALSE); bb\XZ~)F  
 if (pSysMenu != NULL) 3 |LRb/|  
 { :D;pDl  
  CString strAboutMenu; q #7Nk)<.  
  strAboutMenu.LoadString(IDS_ABOUTBOX); r$'.$k\  
  if (!strAboutMenu.IsEmpty()) ]@Z nP,8  
  { &(l.jgqg&  
   pSysMenu->AppendMenu(MF_SEPARATOR); in,0(I&I  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); )'e1@CR  
  } A:2CP&*  
 } d#$Pf=}  
 SetIcon(m_hIcon, TRUE); // Set big icon r!eW]M  
 SetIcon(m_hIcon, FALSE); // Set small icon N;BuBm5K  
 m_Key.SetCurSel(0); 1>Vq<z  
 RegisterHotkey(); A-_M=\  
 CMenu* pMenu=GetSystemMenu(FALSE); T /IX(b'<  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); H"k\(SPVS  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ; lrO?sm  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); <SOG?Lh~  
 return TRUE; // return TRUE unless you set the focus to a control IR:{{ (  
} :oC;.u<*8  
*8;<w~  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) z8%qCq  
{ zSk`Ou8M  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) %[9ty`UE  
 { ad47 42  
  CAboutDlg dlgAbout; Tz.okCo]z  
  dlgAbout.DoModal(); j)@{_tv6;  
 } ;;XY&J  
 else bwP@}(K  
 { [cZ/)tm  
  CDialog::OnSysCommand(nID, lParam); 2J$vX(  
 } BhbfPQ  
} tlg}"lY  
u2$.EM/iae  
void CCaptureDlg::OnPaint() uTPAf^|  
{ :pz@'J  
 if (IsIconic()) n5BD0q  
 { t0v >J9  
  CPaintDC dc(this); // device context for painting !O}e)t  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Ie=gI+2  
  // Center icon in client rectangle 1q5S"=+W[  
  int cxIcon = GetSystemMetrics(SM_CXICON); Uam %u  
  int cyIcon = GetSystemMetrics(SM_CYICON); JdUdl_D z  
  CRect rect; (vzYgU,  
  GetClientRect(&rect); _y>drvg  
  int x = (rect.Width() - cxIcon + 1) / 2; :V#xrH8R  
  int y = (rect.Height() - cyIcon + 1) / 2; 5WxNH}{  
  // Draw the icon (a-Lx2T  
  dc.DrawIcon(x, y, m_hIcon); z j#<X  
 } S Te8*=w  
 else  F0zaA  
 { YPq:z"`-y4  
  CDialog::OnPaint(); &(Hw:W 9  
 } /-^J0f+l3  
} s"w^E\ >6  
GE=S.P;  
HCURSOR CCaptureDlg::OnQueryDragIcon() KHC Fz  
{  AW|SD  
 return (HCURSOR) m_hIcon; "iX\U'`  
} 4MW oGV9  
m?Cb^WgcF  
void CCaptureDlg::OnCancel() Oj_F1. r  
{ DrAIQ7Jd  
 if(bTray) aj .7t =^  
  DeleteIcon(); *3@8,~_tp  
  CDialog::OnCancel(); O\Z!7UQ$  
} L>E{~yh  
eLXL5&}`fh  
void CCaptureDlg::OnAbout() .'38^  
{ n <> ^cD  
 CAboutDlg dlg; SK@ p0:  
 dlg.DoModal(); 45< gO1  
} i!3*)-a\~`  
oAB:H \  
void CCaptureDlg::OnBrowse() `nEqw/I  
{ f O+lD  
 CString str; ?Ov~\[) F  
 BROWSEINFO bi; T@#?{eA  
 char name[MAX_PATH]; EL z5P}L6  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); C0Fd<|[  
 bi.hwndOwner=GetSafeHwnd(); =ONM#DxH  
 bi.pszDisplayName=name; iCh 8e>+  
 bi.lpszTitle="Select folder"; ~Jsu"kr  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; o]qwN:8^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); NRT]dYf"z  
 if(idl==NULL) ,C 0y3pL  
  return; )Td{}vbIh  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); EowzEGq!a5  
 str.ReleaseBuffer(); `r3 klL,W'  
 m_Path=str; ,2^A<IwR  
 if(str.GetAt(str.GetLength()-1)!='\\') JgKhrDx  
  m_Path+="\\"; 8==M{M/eM  
 UpdateData(FALSE); k W 8>VnW  
} 2P@6Qe ?  
>JY\h1+ H  
void CCaptureDlg::SaveBmp() \b!E"I_^  
{ gn~^Ajo  
 CDC dc; qIQ 61><  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); O#O"]A  
 CBitmap bm; 9(z) ^ G  
 int Width=GetSystemMetrics(SM_CXSCREEN); 1x\k:2U  
 int Height=GetSystemMetrics(SM_CYSCREEN); (RG "2I3  
 bm.CreateCompatibleBitmap(&dc,Width,Height); D2gyn-]\  
 CDC tdc; um_J%v6ER  
 tdc.CreateCompatibleDC(&dc); y3QS! 3I  
 CBitmap*pOld=tdc.SelectObject(&bm); !io1~GpKS  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); '!?t+L%gO  
 tdc.SelectObject(pOld); >g~IP>  
 BITMAP btm; gV h&c 4  
 bm.GetBitmap(&btm); xWK/uE(  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; kz6fU\U  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); p>3QW3<  
 BITMAPINFOHEADER bih; P{_%p<:V  
 bih.biBitCount=btm.bmBitsPixel; *vIP\NL?H  
 bih.biClrImportant=0; 2*#i/SE_  
 bih.biClrUsed=0; PN<Vqt W  
 bih.biCompression=0; GQd[7j[sh  
 bih.biHeight=btm.bmHeight; Dr=$}Y  
 bih.biPlanes=1; >BK/HuS  
 bih.biSize=sizeof(BITMAPINFOHEADER); zks7wt]A  
 bih.biSizeImage=size; x{K"z4xbI  
 bih.biWidth=btm.bmWidth; &ynAB)  
 bih.biXPelsPerMeter=0; 2]5Li/   
 bih.biYPelsPerMeter=0; &=n/h5e0t&  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =&9c5"V&  
 static int filecount=0; UQ7]hX9  
 CString name; In1n.oRFn^  
 name.Format("pict%04d.bmp",filecount++); )s, t BU+N  
 name=m_Path+name; c?}G;$  
 BITMAPFILEHEADER bfh; &nI>`Q'  
 bfh.bfReserved1=bfh.bfReserved2=0; U:3O E97  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 33D2^ Sf6"  
 bfh.bfSize=54+size; =mPe wx'  
 bfh.bfOffBits=54; +r;t]  
 CFile bf; tCGx]\  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ "$o>_+U  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); g)TZ/,NQ{  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); xDH#K0-#L  
  bf.WriteHuge(lpData,size); j3N d4#  
  bf.Close(); N|>JLZ>  
  nCount++; .QZjJ9pvK  
 } M eep  
 GlobalFreePtr(lpData); IvY3iRq6  
 if(nCount==1) w%X@os}E  
  m_Number.Format("%d picture captured.",nCount); ]$9y7Bhj.  
 else 42 lw>gzr!  
  m_Number.Format("%d pictures captured.",nCount); YwF&-~mp7n  
  UpdateData(FALSE); ~OR^  
} A?}[rM Z  
P:vp/x!  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) `aG _m/7|  
{ *) T"-}F  
 if(pMsg -> message == WM_KEYDOWN) 8HJ,6Lr;  
 { |W=-/~X  
  if(pMsg -> wParam == VK_ESCAPE) `sso Wn4  
   return TRUE; %D:VcY9OC  
  if(pMsg -> wParam == VK_RETURN) 'bSWJ/;p)  
   return TRUE; }+pwSjsno  
 } s2|.LmC3|B  
 return CDialog::PreTranslateMessage(pMsg); 8]b;l; W5  
} &QW&K  
!y/e Fx  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) & /T}  
{ m;>G]Sbe  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 3BD&;.<r  
  SaveBmp(); [r3sk24  
  return FALSE; Eri007?D  
} 0,0Z!-Y  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ K\fD';  
 CMenu pop; Y%0rji  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !m9hL>5vR  
 CMenu*pMenu=pop.GetSubMenu(0); %cUC~, g_(  
 pMenu->SetDefaultItem(ID_EXITICON); [M%? [E}>  
 CPoint pt; aQ\SV0PI  
 GetCursorPos(&pt); h%W,O,K/  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ji\LC%U-  
 if(id==ID_EXITICON) rXMc0SPk  
  DeleteIcon(); )[ZXPD  
 else if(id==ID_EXIT) hE`d@  
  OnCancel(); x7<l*WQ  
 return FALSE; fKr_u<|  
} v^s?=9  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); \mJR^t  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~1}fL 1~5  
 AddIcon(); N '&>bO?@`  
 return res; 4^:dmeMZ`  
} A- Abj'  
R13k2jLSQ  
void CCaptureDlg::AddIcon() JeNX5bXW  
{ % 33O)<?  
 NOTIFYICONDATA data; U YJ>L  
 data.cbSize=sizeof(NOTIFYICONDATA); /j$pV  
 CString tip; G/},lUzLg  
 tip.LoadString(IDS_ICONTIP); U>.5vK.+  
 data.hIcon=GetIcon(0); s[h;9 I1w  
 data.hWnd=GetSafeHwnd(); u t4:LHF  
 strcpy(data.szTip,tip); *aWh]x9TlU  
 data.uCallbackMessage=IDM_SHELL; *WJK&  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; - ry  
 data.uID=98; N}7b^0k  
 Shell_NotifyIcon(NIM_ADD,&data); a*D<J}xe  
 ShowWindow(SW_HIDE); RfD#/G3|  
 bTray=TRUE; .|07IH/Di{  
} {Ke IYjE  
@}!?}QU  
void CCaptureDlg::DeleteIcon() m,q)lbRl  
{ &1^~G0 Rh\  
 NOTIFYICONDATA data; OGJrwl  
 data.cbSize=sizeof(NOTIFYICONDATA); SIR2 Kc0  
 data.hWnd=GetSafeHwnd(); ONcLhwH  
 data.uID=98; Et-|[ eL  
 Shell_NotifyIcon(NIM_DELETE,&data); *?uUP  
 ShowWindow(SW_SHOW); ;'V[8`Z@  
 SetForegroundWindow(); -#/DK   
 ShowWindow(SW_SHOWNORMAL); Ps\4k#aOv  
 bTray=FALSE; R_GA`U\ {  
} 7]5~ml3:  
P{`fav  
void CCaptureDlg::OnChange() l$c/!V[3  
{ iWr #H  
 RegisterHotkey(); PZZPx<?N  
} Rc4=zimr+  
d#bg(y\G|  
BOOL CCaptureDlg::RegisterHotkey() Z+);}>-5  
{ P(8 uL|^  
 UpdateData(); |P|2E~[r  
 UCHAR mask=0; &Fuk+Cu{  
 UCHAR key=0; Zj ` ;IYFG  
 if(m_bControl) mdrqX<x'~  
  mask|=4; %Y'/_ esH2  
 if(m_bAlt) *9=}f;~  
  mask|=2; CW8YNJ'  
 if(m_bShift) AU%Yr 6  
  mask|=1; p= x &X~  
  key=Key_Table[m_Key.GetCurSel()]; !J<0.nO/:  
 if(bRegistered){ tq'hiS(b  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); z~p!7q&g  
  bRegistered=FALSE; udr|6EjD.  
 } bVN?7D(  
 cMask=mask; hH;i_("i(h  
 cKey=key; 4K`b?{){+a  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); mA,{E-T  
 return bRegistered; Th\T$T`X$  
} iRG6Cw2  
4A(h'(^7A  
  四、小结 z+wegF  
j^U"GprA  
  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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