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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: <J!?eH9f  
  |TuFx=~5v  
  一、实现方法 .WW|v  
3 n1 > +8  
  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: }/F9(m  
]#J-itO  
#pragma data_seg("shareddata") |f+fG=a67V  
HHOOK hHook =NULL; //钩子句柄 =M34 HPG  
UINT nHookCount =0; //挂接的程序数目 Qh4Z{c@  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ^+9i~PjL  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 8' +I8J0l  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey C0'_bTfB  
static int KeyCount =0; D;X/7 p|>  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 c nV2}U/\  
#pragma data_seg() '_o(I  
< #7j~<  
  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。 1zY" Uxp  
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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: hu-6V="^9  
h) W|~y@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR lf2(h4[1R  
cKey,UCHAR cMask) h=ko_/<  
{ Yf x'7gj  
 BOOL bAdded=FALSE; ~ 6Hi"w  
 for(int index=0;index<MAX_KEY;index++){ (e[8`C  
  if(hCallWnd[index]==0){ 6"jV>CNc@  
   hCallWnd[index]=hWnd; ~a.ei^r  
   HotKey[index]=cKey; A)u,Hvn  
   HotKeyMask[index]=cMask; p}-B>v  
   bAdded=TRUE; -&r A<j  
   KeyCount++; XE : JL_  
   break; +L#Q3}=s  
  } ,+E"s3NW  
 } -2*Pm1\Z  
 return bAdded; o$,e#q)8  
} GhY MO6Q4  
//删除热键 rFYw6&;vOi  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) R"[U<^  
{ [!b=A:@  
 BOOL bRemoved=FALSE; 0 I[3%Q{  
 for(int index=0;index<MAX_KEY;index++){ lNqF@eCT9  
  if(hCallWnd[index]==hWnd){ N uq/y=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ wnbKUlb  
    hCallWnd[index]=NULL; |j7{zsH  
    HotKey[index]=0; 0uf)6(f  
    HotKeyMask[index]=0; 0-zIohSJdQ  
    bRemoved=TRUE; xX{gm'3UYa  
    KeyCount--; 47 9yG/+\  
    break; g2GHsVS  
   } c=~FXV!  
  } F]^ZdJ2  
 } # ,27,#  
 return bRemoved; ( T2 \   
} ,{{Z)"qaH  
C(5B/W6  
4$jb-Aw  
  DLL中的钩子函数如下: "9yQDS:  
hIMD2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) i 9wk)  
{ mEDi'!YE"  
 BOOL bProcessed=FALSE; l*<RKY8  
 if(HC_ACTION==nCode) m}?(c)ST  
 { Y @[Dy  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 $qh?$a  
   switch(wParam) "A,-/~cBV  
   {  F<A[S "  
    case VK_MENU: <LA!L  
     MaskBits&=~ALTBIT; 2$gOe^ &  
     break; eEMU,zCl  
    case VK_CONTROL: [f\TnXq24  
     MaskBits&=~CTRLBIT; D]$X@2A  
     break; o"@GYc["  
    case VK_SHIFT: t5jZ8&M5]  
     MaskBits&=~SHIFTBIT; ayoqitXD?  
     break; 84u %_4/  
    default: //judge the key and send message P+[\9Gg  
     break; 8iwqy0<  
   } tJ!s/|u(  
   for(int index=0;index<MAX_KEY;index++){ NU$?BiB?R  
    if(hCallWnd[index]==NULL) UqaV9  
     continue; 8!u8ZvbFG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  a 9f%p  
    { }o MY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Q{+N{/tF  
     bProcessed=TRUE; z\ ?cazQ  
    } '"14(BvW  
   } lq\/E`fc`  
  } 'J"m`a8no  
  else if((lParam&0xc000ffff)==1){ //有键按下 7>>6c7e  
   switch(wParam) dUL3UY3  
   { QIZbAnn_  
    case VK_MENU: \1b!I)T9  
     MaskBits|=ALTBIT; gl~>MasV&  
     break; .l(t\BfE~  
    case VK_CONTROL: Ud[Zv?tA:  
     MaskBits|=CTRLBIT; \w\{x0u  
     break; a}MSA/K(  
    case VK_SHIFT: COk;z.Kn  
     MaskBits|=SHIFTBIT; 1Ydym2  
     break; maR5hgWCHe  
    default: //judge the key and send message ([a[ fi  
     break; O+Qt8,  
   } ts3BmfR?  
   for(int index=0;index<MAX_KEY;index++){ j=~c( B  
    if(hCallWnd[index]==NULL) 3G)Wmmh"a  
     continue; aL%amL6CX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y>i?nC%*  
    { 0755;26Bx  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); KM ;'MlO  
     bProcessed=TRUE; `cBV+00YS  
    } m?Qr)F_M  
   } vPA {)l\K  
  } =UW! 7OzC  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 t^zmv PDK  
   for(int index=0;index<MAX_KEY;index++){ dJ}E,rW}  
    if(hCallWnd[index]==NULL) $Q cr  
     continue;  B1!b@0^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 9dFSppM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Z U^dLN- N  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 KixS)sG  
   } Q-g}{mFS  
  } 2po>%Cp  
 } ) ]x/3J@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); N1O.U"L;  
} ``p( )^zT  
qvH7otA  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: U*s QYt<?g  
9OnH3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bijE]:<AE7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~@wM[}ThP$  
g:sn/Zug]  
  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: O8drR4 Pt  
SuU_psF  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `pzXh0}|  
{ rL /e  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 8I`t`C/4  
 { |3A/Og  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 a*Oc:$  
  SaveBmp(); xF4>D!T%8  
  return FALSE; tgPx!5U  
 } ] _WB^  
 …… //其它处理及默认处理 _z$lg]q  
} sm~{fg  
~;*SW[4  
SXW8p>1Jw  
  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。 (!@ Q\P  
mu?6Phj  
  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。 bo  J  
5uU.K3G7  
  二、编程步骤 Ikn)XZU^  
[?vn>  
  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"; |%@.@c  
D/ SM/  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; $\ 0d9^)&  
UtebSQ+h\  
  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; 1j7sJ" *  
?/ @~ d  
  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; ?{OB+f}Mo  
A@kp` -  
  5、 添加代码,编译运行程序。 u ::2c  
VQQtxHTC3  
三、程序代码 $]Vvu{  
5zqlK-$  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL X(Wd  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) vIi#M0@N  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 5ZRO{rf  
#if _MSC_VER > 1000 MifPZQ  
#pragma once \[Dxg`;4  
#endif // _MSC_VER > 1000 IU8/B+hM~  
#ifndef __AFXWIN_H__ %6vf~oG  
#error include 'stdafx.h' before including this file for PCH wm$1LZ8o-`  
#endif 8$H_:*A?  
#include "resource.h" // main symbols d3$&I==;:  
class CHookApp : public CWinApp YtzB/q8I  
{ gdu8O!9)  
 public: TfYXF`d  
  CHookApp(); K9#=@}!3L  
  // Overrides }T}9AQ}|  
  // ClassWizard generated virtual function overrides <9]9;   
  //{{AFX_VIRTUAL(CHookApp) =-r[ s%t &  
 public: !8Rsz:7^-  
  virtual BOOL InitInstance(); 2&f] v`|M|  
  virtual int ExitInstance(); l.#iMi(@p~  
  //}}AFX_VIRTUAL ]5+db0  
  //{{AFX_MSG(CHookApp) lm?1 K:+[  
  // NOTE - the ClassWizard will add and remove member functions here. L|7F%oR  
  // DO NOT EDIT what you see in these blocks of generated code ! 4+Sq[Rv0  
  //}}AFX_MSG :+9KNyA  
  DECLARE_MESSAGE_MAP() uz(3ml^S  
}; bF#*cH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); $rAHtr  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XQW+6LEQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); XF`,mV4  
BOOL InitHotkey(); 7g}lg8M  
BOOL UnInit(); '8Q:}{  
#endif 8J P{`)  
jb!R  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. v[r5!,F  
#include "stdafx.h" NDJIaX:]  
#include "hook.h" iBq|]  
#include <windowsx.h> PhHBmM GL  
#ifdef _DEBUG ~VRt 6C  
#define new DEBUG_NEW *nv%~t   
#undef THIS_FILE 7gLN7_2  
static char THIS_FILE[] = __FILE__; : "|M  
#endif V'XmMn)!  
#define MAX_KEY 100 T+OQa+E@P  
#define CTRLBIT 0x04 \,-t]$9  
#define ALTBIT 0x02 'w?*4H  
#define SHIFTBIT 0x01 k* ayzg3F>  
#pragma data_seg("shareddata") lzQmD/i*  
HHOOK hHook =NULL; hP=^JH  
UINT nHookCount =0; 6^vMJ82U  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey E^:8Jehq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 7r`A6 \ !  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey D;pfogK @  
static int KeyCount =0; na;U]IK  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift v&hQ;v  
#pragma data_seg() YceX)  
HINSTANCE hins; h}X^  
void VerifyWindow(); ? 1OZEzA!  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) {9tKq--@E9  
//{{AFX_MSG_MAP(CHookApp) 2;Ij~~  
// NOTE - the ClassWizard will add and remove mapping macros here. 2VrO8q(  
// DO NOT EDIT what you see in these blocks of generated code! 7q>Y)*V  
//}}AFX_MSG_MAP Xndgs}zz  
END_MESSAGE_MAP() mVg$z  
_I$\O5  
CHookApp::CHookApp() ^ |k 7g  
{ (vq0Gl  
 // TODO: add construction code here, tgy= .o]  
 // Place all significant initialization in InitInstance @a08*"lbp  
} G@YX8!w U  
V &K:~[M  
CHookApp theApp; mgIB8D+6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7QXA*.' F  
{ j-e gsKR  
 BOOL bProcessed=FALSE; u!=9.3  
 if(HC_ACTION==nCode) O "jX|5  
 { 7oPLO(0L  
  if((lParam&0xc0000000)==0xc0000000){// Key up Y#>'.$ (Az  
   switch(wParam) C@{#OOa  
   { wABaNB=9;  
    case VK_MENU: h L 1q9%  
     MaskBits&=~ALTBIT; *hhPCYOm  
     break; LL|uMe"Jb  
    case VK_CONTROL: DrfOz#a0Uu  
     MaskBits&=~CTRLBIT; HLL[r0P`F  
     break; 'W!N1W@  
    case VK_SHIFT: ea"!:cL(g  
     MaskBits&=~SHIFTBIT; o"^+i#H!  
     break; njbEw4nX  
    default: //judge the key and send message hJr cy!P<a  
     break; B0_[bQoc1  
   } %?GLMf7)  
   for(int index=0;index<MAX_KEY;index++){ g"Eg=CU  
    if(hCallWnd[index]==NULL) V/X4WZs|i  
     continue; k<aKT?Ek>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5XK}8\  
    { (=hXt=hZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Mw=sW5Z  
     bProcessed=TRUE; >zYO1.~  
    } NQ7 j{dJ?  
   } S7{L-"D =y  
  } ~FnB!Mh}?  
  else if((lParam&0xc000ffff)==1){ //Key down v!\\aG/  
   switch(wParam) <M(Jqb cWa  
   { {o2pCH  
    case VK_MENU: 5Ocd2T'  
     MaskBits|=ALTBIT; +(v<_#wR-  
     break; qH3<,s*  
    case VK_CONTROL:  b)7uz>I  
     MaskBits|=CTRLBIT; j"FX ?|4  
     break; pF)}<<C  
    case VK_SHIFT: e(;1XqLM  
     MaskBits|=SHIFTBIT; 7+I%0U}m  
     break; t<_Jx<{2  
    default: //judge the key and send message ttazY#  
     break; D}n&`^1X+  
   } _cz&f%qr  
   for(int index=0;index<MAX_KEY;index++) 3=6`'PKRQ  
   { I) mP ?  
    if(hCallWnd[index]==NULL) mcbr3P  
     continue; ds@w=~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~VNN  
    {  tCT-cs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -P|EV|8=  
     bProcessed=TRUE; oV4+w_rrLc  
    } l[KFK%?  
   } Y)?dq(  
  } G k'j<a  
  if(!bProcessed){ G~,K$z/-l  
   for(int index=0;index<MAX_KEY;index++){ (~YFm"S  
    if(hCallWnd[index]==NULL) ?{bF3Mz=  
     continue; ( K5w0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @]*b$6tt  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); v&BKl  
   } ye-o'%{  
  } 0_Gi1)  
 } +f{CfWIKs  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); rgQ6/3}qc  
} A=Au>"nAA  
qT`sPEs;V  
BOOL InitHotkey() K<@gU\-!  
{ #St=%!  
 if(hHook!=NULL){ h/h`?vWu  
  nHookCount++; DP2 ^(d<  
  return TRUE; R5`"~qP-  
 } "qEi$a&]  
 else zdDn. vG  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); /:]`TlAb,  
  if(hHook!=NULL) 'r KDw06/  
   nHookCount++; =[wVRQ?  
  return (hHook!=NULL); wzX 1!?  
} ("2ukHc  
BOOL UnInit() l,FK\  
{ @"M%ZnFu  
 if(nHookCount>1){ :HSqa9>wa  
  nHookCount--; BMw_F)hTO  
  return TRUE; sE*A,z?  
 } EN lqoj1  
 BOOL unhooked = UnhookWindowsHookEx(hHook); X#l]%IrW!  
 if(unhooked==TRUE){ T6s~f$G  
  nHookCount=0; Q'f!392|  
  hHook=NULL; 1WGcv O)<  
 } V=<OV]0  
 return unhooked; Pn)^mt  
} ^;J@]&[ ~  
A;e[-5@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) zCrDbGvqF`  
{ Yjv[rH5v  
 BOOL bAdded=FALSE; f wN  
 for(int index=0;index<MAX_KEY;index++){ [4)q6N5`f  
  if(hCallWnd[index]==0){ gTz66a@i  
   hCallWnd[index]=hWnd; W"9?D  
   HotKey[index]=cKey; !V~`e9[rl  
   HotKeyMask[index]=cMask; y %dUry%>  
   bAdded=TRUE; Fs^d-I  
   KeyCount++; \;0J6LBc  
   break; ?Ji.bnfK  
  } I(6k.PQ  
 } ~z)diF<  
 return bAdded; :t &ib}v  
} R|PFGhi6"A  
U#oe8(?#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F...>%N$  
{ S~WsGLF s  
 BOOL bRemoved=FALSE; [ m*=Q  
 for(int index=0;index<MAX_KEY;index++){ n\v\<mVTb7  
  if(hCallWnd[index]==hWnd){ :Jp$_T&E  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ z/bJDSQ  
    hCallWnd[index]=NULL; #(o 'G4T  
    HotKey[index]=0; !!Tk'=t9"3  
    HotKeyMask[index]=0; )|>LSKT El  
    bRemoved=TRUE; gi::?ET/.  
    KeyCount--; \>0F{-cR$  
    break; pg3B^  
   } ?!H <V@a  
  } lk $S"OH!  
 } A1xY8?#?~c  
 return bRemoved; )A]E:]2  
} 8Z;wF  
h.Cr;w,2R  
void VerifyWindow() 0{ov LzW  
{ {7^7)^@  
 for(int i=0;i<MAX_KEY;i++){ yteJHaq  
  if(hCallWnd!=NULL){ rvT7 5dV0  
   if(!IsWindow(hCallWnd)){ MpbH!2J  
    hCallWnd=NULL; .pNPC|XU  
    HotKey=0; `Q2 `":  
    HotKeyMask=0; iE}jilU  
    KeyCount--; S[fzy$">  
   } ]A}'jP  
  } vt`hY4  
 } - #]?3*NO  
} jEBZ"Jvb  
o[AQS`  
BOOL CHookApp::InitInstance() 1gp3A  
{ C3fSSa%b  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); K~nk:}3Ui  
 hins=AfxGetInstanceHandle(); wyO@oi Vn  
 InitHotkey(); bK `'zi  
 return CWinApp::InitInstance(); ]a|3"DP5  
} V}732?Jy  
G!~[+B  
int CHookApp::ExitInstance() <wwcPe}  
{ 3 wVN:g7  
 VerifyWindow(); kq6K<e4jO  
 UnInit(); jREj]V>  
 return CWinApp::ExitInstance(); 9NwA5TP9_  
} ZVotIQ/Q'  
B 95}_q  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Tfc5R;Rw  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {.9phW4Vr?  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ jRXpEiM  
#if _MSC_VER > 1000 y4`<$gL   
#pragma once >So)KB  
#endif // _MSC_VER > 1000  eWO^n>Y  
[T', ZLR|  
class CCaptureDlg : public CDialog ocwRU0+j  
{ R4,j  
 // Construction h'wOslyFa  
 public: YIA}F1:  
  BOOL bTray; wC@5[e$  
  BOOL bRegistered; 2Mx9Kd'a r  
  BOOL RegisterHotkey(); +r)'?zU  
  UCHAR cKey; W(9fCDO;  
  UCHAR cMask; gkUG*Zw  
  void DeleteIcon(); CQfrAk4mu  
  void AddIcon(); 0;'kv |  
  UINT nCount; _+ K[1P  
  void SaveBmp(); *a Y`[,4#$  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor UJkg|eu  
  // Dialog Data #3maT*JY  
  //{{AFX_DATA(CCaptureDlg) 'UO,DFq[Fl  
  enum { IDD = IDD_CAPTURE_DIALOG }; y wlN4=  
  CComboBox m_Key; 7G}vQO  
  BOOL m_bControl; tx;DMxN!W  
  BOOL m_bAlt; Q[i/]  
  BOOL m_bShift; ug!DL=ZW  
  CString m_Path; JsOPI ]  
  CString m_Number; }x4,a6^  
  //}}AFX_DATA ,J?Hdy:R  
  // ClassWizard generated virtual function overrides ~uRG~,{rH  
  //{{AFX_VIRTUAL(CCaptureDlg) <by}/lF0  
 public: o[*</A }  
  virtual BOOL PreTranslateMessage(MSG* pMsg); '2=u<a B  
 protected: =tl[?6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support s}A)sBsaP3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); W#|]m=2W  
  //}}AFX_VIRTUAL v=?U{{xQ  
  // Implementation MjC;)z  
 protected: Ky`rf}cI>  
  HICON m_hIcon; +=%13cA*U  
  // Generated message map functions [w l:"rm  
  //{{AFX_MSG(CCaptureDlg) .['@:}$1  
  virtual BOOL OnInitDialog(); [6qa"Ie  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~T<#HSR`  
  afx_msg void OnPaint(); HGmgQ>q@M$  
  afx_msg HCURSOR OnQueryDragIcon(); s)<#a(!  
  virtual void OnCancel(); 1QM*oj:  
  afx_msg void OnAbout(); J=>?D@K  
  afx_msg void OnBrowse(); eSXt"t  
  afx_msg void OnChange(); I ,Q"<? &  
 //}}AFX_MSG /h%<e  
 DECLARE_MESSAGE_MAP() v'*Q[ ('  
}; vBsd.2t~  
#endif >x)YdgJ*  
WMBntB   
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file <Fb3\T L  
#include "stdafx.h" 70&v`"  
#include "Capture.h" 13Ga #  
#include "CaptureDlg.h" eN{[T PPCq  
#include <windowsx.h> yyh L]Uq"=  
#pragma comment(lib,"hook.lib") 8%JxXtWW`  
#ifdef _DEBUG (5{|']G  
#define new DEBUG_NEW IjN3 jU  
#undef THIS_FILE ';??0M  
static char THIS_FILE[] = __FILE__; e;pVoRI  
#endif *w4jET>  
#define IDM_SHELL WM_USER+1 ,.tT9? m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); EDvK9J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &$  F0  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ayyn6a8  
class CAboutDlg : public CDialog A|tee@H*0  
{ "xZ]i)  
 public: +Tc4+q!  
  CAboutDlg(); I})la!9   
  // Dialog Data b].:2  
  //{{AFX_DATA(CAboutDlg) H[V^wyi'z  
  enum { IDD = IDD_ABOUTBOX }; hN c;, 13  
  //}}AFX_DATA i0,{*LD%^  
  // ClassWizard generated virtual function overrides noe1*2*TE  
  //{{AFX_VIRTUAL(CAboutDlg) 0"o<( 1  
 protected: -h*Yd)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r9@O`i  
  //}}AFX_VIRTUAL gBHev1^y  
  // Implementation xBU\$ToC  
 protected: ;OmmXygl  
  //{{AFX_MSG(CAboutDlg) Jl&bWp^3  
  //}}AFX_MSG j11\t  
  DECLARE_MESSAGE_MAP() ,Ihuo5>/z  
}; [6BL C{2  
/7*jH2  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) lO8.Q"mxo  
{ F1R91V|  
 //{{AFX_DATA_INIT(CAboutDlg) 5/DTE:M<  
 //}}AFX_DATA_INIT k);z}`7  
} 8,YF>O&  
]R}#3(]1  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Ri4_zb  
{ UT [7 J  
 CDialog::DoDataExchange(pDX); m\7-/e2 a  
 //{{AFX_DATA_MAP(CAboutDlg) #h ;j2  
 //}}AFX_DATA_MAP ~X5yHf3  
} +,7dj:0S  
c a_N76o!  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) m{!BSl  
 //{{AFX_MSG_MAP(CAboutDlg) )V JAs|  
 // No message handlers ?+GbPG~  
 //}}AFX_MSG_MAP +-'qI_xo  
END_MESSAGE_MAP() E xKH%I  
nFW^^v<  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) w(r$n|Ks9  
: CDialog(CCaptureDlg::IDD, pParent) SDiZOypS  
{ COFs?L.`  
 //{{AFX_DATA_INIT(CCaptureDlg) ]l+Bg;F#V  
  m_bControl = FALSE; \l{*1lQ`  
  m_bAlt = FALSE; mW1Sd#0  
  m_bShift = FALSE; PTA;a 0A  
  m_Path = _T("c:\\"); n)} J<  
  m_Number = _T("0 picture captured."); Zqd&EOm  
  nCount=0; ,Ng3!2&$e  
  bRegistered=FALSE; K%qunjv  
  bTray=FALSE; {d}-SoxH  
 //}}AFX_DATA_INIT I"Ji_4QV  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 /`hr)  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); p]`pUw{  
} J=*y>Zt-b  
 g}Hk4+  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) tzi+A;>c(v  
{ WRh&4[G'  
 CDialog::DoDataExchange(pDX); &[*_ -  
 //{{AFX_DATA_MAP(CCaptureDlg) X~0l1 @!  
  DDX_Control(pDX, IDC_KEY, m_Key); kR^7Z7+#*  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Y@KZ:0<  
  DDX_Check(pDX, IDC_ALT, m_bAlt); nX5*pTfjL3  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); vIU+ZdBw  
  DDX_Text(pDX, IDC_PATH, m_Path); r{)d?Ho=  
  DDX_Text(pDX, IDC_NUMBER, m_Number); !/< 5.9!9r  
 //}}AFX_DATA_MAP 5|m|R"I*Y  
} KwPJ0 ]('_  
=t@m:  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ~0ZEnejy  
//{{AFX_MSG_MAP(CCaptureDlg) D\(,:_ge  
 ON_WM_SYSCOMMAND() 78+H|bH8  
 ON_WM_PAINT() *IGxa  
 ON_WM_QUERYDRAGICON() =d~]*[8  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ifTVTd7O  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) |rdG+ >  
 ON_BN_CLICKED(ID_CHANGE, OnChange) &-<"HW  
//}}AFX_MSG_MAP Lj*F KP\{  
END_MESSAGE_MAP() ol!o8M%Q  
KblOP{I  
BOOL CCaptureDlg::OnInitDialog() kjaz{&P  
{ n#z^uq|v  
 CDialog::OnInitDialog(); |GK [I  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ^ eM=h  
 ASSERT(IDM_ABOUTBOX < 0xF000); 1GOa'bxm  
 CMenu* pSysMenu = GetSystemMenu(FALSE);  =e$ #m;  
 if (pSysMenu != NULL) zIF &ZYP  
 { [w=x0J&  
  CString strAboutMenu; bQXxb(^  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 6 $ IXER  
  if (!strAboutMenu.IsEmpty()) t vk^L3=<  
  { JsnavI6  
   pSysMenu->AppendMenu(MF_SEPARATOR); bIp;$ZHy`K  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); kUP[&/Lc  
  } 7;CeQx/W)W  
 } [2i+f <  
 SetIcon(m_hIcon, TRUE); // Set big icon `Z|s p  
 SetIcon(m_hIcon, FALSE); // Set small icon ~e{2Y%  
 m_Key.SetCurSel(0); 1Dt"Rcn"4  
 RegisterHotkey(); yp@mxI@1  
 CMenu* pMenu=GetSystemMenu(FALSE); $k'f)E  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 3Xd+>'H  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); NnHwk)'  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); #cdLg-v  
 return TRUE; // return TRUE unless you set the focus to a control d.2b7q09  
} ) V@qH]  
}S#.Pw%  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `}zv17wp  
{ Jk{>*jYk`  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 3BY/&'oX  
 { q/;mxq$  
  CAboutDlg dlgAbout; v[Q)cqj/  
  dlgAbout.DoModal(); (R6ZoBZ  
 } E*(Q'p9C  
 else GGJ_,S*  
 { K"}Dbr  
  CDialog::OnSysCommand(nID, lParam);  \W=  
 } _ <>+Dk&  
} cYbO)?mC_  
+D h=D*  
void CCaptureDlg::OnPaint() I]k'0LG*^  
{ < ht >>  
 if (IsIconic()) Phb<##OB  
 { ~B=\![  
  CPaintDC dc(this); // device context for painting 2~ 'Q#(  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); (S2<6Nm8  
  // Center icon in client rectangle $hKgTf?  
  int cxIcon = GetSystemMetrics(SM_CXICON); \&TTe8  
  int cyIcon = GetSystemMetrics(SM_CYICON); E32z(:7M  
  CRect rect; ise@,[!  
  GetClientRect(&rect); SbGp  
  int x = (rect.Width() - cxIcon + 1) / 2; V >['~|  
  int y = (rect.Height() - cyIcon + 1) / 2; _I8-0DnOM  
  // Draw the icon *kKGsy  
  dc.DrawIcon(x, y, m_hIcon); Rw/G =zV@2  
 } ED?s[K  
 else sm_:M| [D  
 { U!e4_JBR'  
  CDialog::OnPaint(); I[4E?  
 } I?fE=2}9  
} :lE7v~!Z  
&1Y+ q]  
HCURSOR CCaptureDlg::OnQueryDragIcon() _p_F v>>:  
{ \6lXsu;I.X  
 return (HCURSOR) m_hIcon; iEU(1?m2-  
} ,7QnZ=F  
]-}a{z  
void CCaptureDlg::OnCancel() {^\-%3$  
{ t[Q^Xp  
 if(bTray) +$UfP(XmH  
  DeleteIcon(); 'P~*cr ?A  
  CDialog::OnCancel(); 4;*V^\',9  
} O Z#?  
`3+U6>U [  
void CCaptureDlg::OnAbout() ^M80 F7  
{ t%TZu>(1O  
 CAboutDlg dlg; +]>a`~   
 dlg.DoModal(); 'sA&Pm  
} djSN{>S  
Olno9_'  
void CCaptureDlg::OnBrowse() "~[Rwh?  
{ - a=yi d  
 CString str; %bimcRX#W  
 BROWSEINFO bi; q@\_q!  
 char name[MAX_PATH]; sbs"26IE  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); xv*mK1e  
 bi.hwndOwner=GetSafeHwnd(); gRFC n6Q  
 bi.pszDisplayName=name; iM9563v  
 bi.lpszTitle="Select folder"; V\G>e{  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; T+[e6/|  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); =CVw0'yZ  
 if(idl==NULL) ko:I.6-K  
  return; va<+)b\  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); $` oA$E3  
 str.ReleaseBuffer(); QB.7n&u  
 m_Path=str; ]u,~/Gy  
 if(str.GetAt(str.GetLength()-1)!='\\') B.WJ6.DkS  
  m_Path+="\\"; ms{R|vU%b  
 UpdateData(FALSE); \8$`:3,@  
} OM.^>=  
M ?3N  
void CCaptureDlg::SaveBmp() kzmt'/L8  
{ [D,:=p`  
 CDC dc; D# $gdjZ  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); - VE#:&  
 CBitmap bm; MCCZh{uo  
 int Width=GetSystemMetrics(SM_CXSCREEN); ku{aOV%  
 int Height=GetSystemMetrics(SM_CYSCREEN); 9=o b:  
 bm.CreateCompatibleBitmap(&dc,Width,Height); N\fT6#5B  
 CDC tdc; nZT@d;]U9  
 tdc.CreateCompatibleDC(&dc); |-mazvA  
 CBitmap*pOld=tdc.SelectObject(&bm); jgstx3  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); \1Bgs^  
 tdc.SelectObject(pOld); <2 Q@^  
 BITMAP btm; Y/^<t'o&  
 bm.GetBitmap(&btm); n>4S P_[E7  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; S?{5DxilO  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ep?0@5D}]  
 BITMAPINFOHEADER bih; '-vy Q^  
 bih.biBitCount=btm.bmBitsPixel; n~ql]Ln  
 bih.biClrImportant=0; [v`4OQF/  
 bih.biClrUsed=0; gfYB|VyWo  
 bih.biCompression=0; ;1dz?'%V  
 bih.biHeight=btm.bmHeight; /'1y`j<  
 bih.biPlanes=1; v<SEGv-  
 bih.biSize=sizeof(BITMAPINFOHEADER); IBqY$K+l  
 bih.biSizeImage=size; /OP*ARoC21  
 bih.biWidth=btm.bmWidth; 'l:2R,cP  
 bih.biXPelsPerMeter=0; J4vKfxEg  
 bih.biYPelsPerMeter=0; !BX62j\?  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); f+920/>!Z  
 static int filecount=0; R\}YD*  
 CString name; _y9P]@Q7%  
 name.Format("pict%04d.bmp",filecount++); ^55?VQB  
 name=m_Path+name; |FFC8R%@]u  
 BITMAPFILEHEADER bfh; 6ZR0_v;TD  
 bfh.bfReserved1=bfh.bfReserved2=0; *I67SBt  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Ig<p(G.;}  
 bfh.bfSize=54+size; E8i:ER $$7  
 bfh.bfOffBits=54; p[)<d_  
 CFile bf; ) b10%n^  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <C77_t  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); mc'p-orAf  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ~D5MAEazS  
  bf.WriteHuge(lpData,size); 5avO48;Vc  
  bf.Close(); 3~Ln:4[6ID  
  nCount++; w#T,g9  
 }  62jA  
 GlobalFreePtr(lpData); &[RU.Q!_H  
 if(nCount==1) 8:% R |b  
  m_Number.Format("%d picture captured.",nCount); /6zpVkV  
 else t {"iIz_S  
  m_Number.Format("%d pictures captured.",nCount); m3!M L>nLt  
  UpdateData(FALSE); GU3/s&9  
} bY~v0kg  
'EV  *-_k  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 1%"` =$q%  
{ _zh5KP[{  
 if(pMsg -> message == WM_KEYDOWN) ku?_/-ko]  
 { ]e.+u  
  if(pMsg -> wParam == VK_ESCAPE) E<uOk  
   return TRUE; QZr<=}   
  if(pMsg -> wParam == VK_RETURN) 9C;Y5E~'L  
   return TRUE; uw=Ube(  
 } ?vFh)U  
 return CDialog::PreTranslateMessage(pMsg); Hz8`)cv`  
} f'OvG@  
n*~   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ef&@aB  
{ >e;STU  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Jt6J'MOq  
  SaveBmp(); ap^=CEf   
  return FALSE; Q ~JKKq  
} 6# ";W2  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 1omvE9 %zM  
 CMenu pop; >UY_:cW4%m  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 9M]"%E!s  
 CMenu*pMenu=pop.GetSubMenu(0); W_\L_)^X  
 pMenu->SetDefaultItem(ID_EXITICON); J~3T8e#  
 CPoint pt; (Fzh1#  
 GetCursorPos(&pt); #<Nvy9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); NCnId}BT  
 if(id==ID_EXITICON) V1)P=?%(US  
  DeleteIcon(); I&8SP$S>J  
 else if(id==ID_EXIT) a~F@3Pd  
  OnCancel(); %J7mZB9  
 return FALSE; v8bl-9DQ  
} xsDa!  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); <C%-IZv$  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) (V.,~t@  
 AddIcon(); $sF#Na4^  
 return res; !9xANSb  
} j9ta0~x1*6  
6^O?p2xpo  
void CCaptureDlg::AddIcon() M#]|$\v(  
{ R.IUBw5;/  
 NOTIFYICONDATA data; d[e:}1  
 data.cbSize=sizeof(NOTIFYICONDATA); |$w={N^4  
 CString tip; ^FM9} t/U,  
 tip.LoadString(IDS_ICONTIP); ]H#Rm#q  
 data.hIcon=GetIcon(0); s9kLB.  
 data.hWnd=GetSafeHwnd(); q'F_ j"  
 strcpy(data.szTip,tip); yj'' \  
 data.uCallbackMessage=IDM_SHELL; ` .(S#!gw  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; \h7J/es^p!  
 data.uID=98; Mp"ci+Iu  
 Shell_NotifyIcon(NIM_ADD,&data); =+}}Sv2  
 ShowWindow(SW_HIDE); 2~WFLD  
 bTray=TRUE; _$\5ZVe  
} cJ##K/es  
k> &s( b  
void CCaptureDlg::DeleteIcon() P^3m:bE]  
{ \1mM5r~  
 NOTIFYICONDATA data; ~Oq,[,W  
 data.cbSize=sizeof(NOTIFYICONDATA); `JWYPsWk  
 data.hWnd=GetSafeHwnd(); QHs:=i~VH  
 data.uID=98; &1E~ \8U  
 Shell_NotifyIcon(NIM_DELETE,&data); MIlCUk  
 ShowWindow(SW_SHOW); XDdcq]*|  
 SetForegroundWindow(); &lPBqw  
 ShowWindow(SW_SHOWNORMAL); @=NVOJy}c  
 bTray=FALSE; e*2&s5 #RT  
} (Ef2 w[ '  
f:[d]J|  
void CCaptureDlg::OnChange() w}W@M,.^  
{ &O6;nJEI  
 RegisterHotkey(); m/hi~. D9  
} YNC0Z'c9  
?FV7|)f  
BOOL CCaptureDlg::RegisterHotkey() dD^_^'i  
{ j&[.2PW\  
 UpdateData(); u1) TG "+0  
 UCHAR mask=0; J4[x,(iq(  
 UCHAR key=0; / }XsuH  
 if(m_bControl) 1%hM8:)i_  
  mask|=4; VUy)4*  
 if(m_bAlt) foz5D9sQ  
  mask|=2; kyxSIQ^  
 if(m_bShift)  9VUm=Z#`  
  mask|=1; |c oEBFG  
  key=Key_Table[m_Key.GetCurSel()]; F7Dc!JNa  
 if(bRegistered){ -S,ir  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 827)n[#%|  
  bRegistered=FALSE; =EcIXDzC>  
 } rX!+@>4_L  
 cMask=mask; 1 x\VdT  
 cKey=key; \_gp50(3  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ]~\SR0  
 return bRegistered; yxCM l.  
} n4vXm  
3j+=3n,  
  四、小结 y4/>Ol]  
t?9 ;cS4  
  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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