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用Visual C++实现屏幕抓图程序

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 在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示: n(.L=VuXn  
  }@~+%_;  
  一、实现方法 wScr:o+K>L  
y,K> Wb9e  
  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: eh8lPTKil  
l5D4 ?`|  
#pragma data_seg("shareddata") ^O}J',Fm%f  
HHOOK hHook =NULL; //钩子句柄 a`zHx3Yg  
UINT nHookCount =0; //挂接的程序数目 e'p"gX  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 v3(0Mu0J  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 4y!GFhMh  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey FD[4?\W]#  
static int KeyCount =0; +|H,N7a<  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 )@<HG$#  
#pragma data_seg() `~\8fN  
DcG=u24Xy!  
  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。 U;*O7K=P  
E= .clA  
  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: ENI|e,'[  
IJC]Al,df  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR P76gJ@#m  
cKey,UCHAR cMask) KUC%Da3  
{ CAmIwAx6;  
 BOOL bAdded=FALSE; q\<NW%KtX  
 for(int index=0;index<MAX_KEY;index++){ 2`> (LH  
  if(hCallWnd[index]==0){ 5bd4]1 gj  
   hCallWnd[index]=hWnd; BU7QK_zT:  
   HotKey[index]=cKey; shO4>Ha  
   HotKeyMask[index]=cMask; _Fe=:q  
   bAdded=TRUE; 7K+eI!m.s  
   KeyCount++; fAfB.|cd  
   break; t gHN\@yj  
  } gZ-:4G|J  
 } %Aa_Bumf*:  
 return bAdded; Vt-V'`Y  
} %d<UMbS^  
//删除热键 rB|4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) rrq7UJ;  
{ Yv2L0bUo:  
 BOOL bRemoved=FALSE; qD /h/  
 for(int index=0;index<MAX_KEY;index++){ /<dl"PWkJv  
  if(hCallWnd[index]==hWnd){ ymT]ow6C  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &B++ "f  
    hCallWnd[index]=NULL; c{39,oF  
    HotKey[index]=0;  v&7x ~!O  
    HotKeyMask[index]=0; Y&y<WN}Q  
    bRemoved=TRUE; lwo,D}  
    KeyCount--; wRq f'  
    break; 4VkJtu5  
   } J7~Kjl  
  } /Ao.b|mm  
 } {UF|-VaG  
 return bRemoved; 4{b/Nv:b  
} dEor+5}  
@V@<j)3P  
NH1ak(zHW  
  DLL中的钩子函数如下: Tz7R:S.  
!\5)!B  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) AboRuHQ  
{ JD AX^]  
 BOOL bProcessed=FALSE; u/wWD@,  
 if(HC_ACTION==nCode) a t=;}}X  
 { |>-0q~  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 L:jv%;DM  
   switch(wParam) ): r'IR  
   {  RhE|0N=  
    case VK_MENU: tMo=q7ig  
     MaskBits&=~ALTBIT; XHY,;4  
     break; Ppx4#j  
    case VK_CONTROL: H{_6e6`e.  
     MaskBits&=~CTRLBIT; ENf(E9O  
     break; n.o_._mu2  
    case VK_SHIFT: %*Yb J_j7  
     MaskBits&=~SHIFTBIT; lH"VLO2l  
     break; ^HHT>K-m  
    default: //judge the key and send message VY0-18 o  
     break; ntZHO}'  
   } ,{Z!T5 |  
   for(int index=0;index<MAX_KEY;index++){ 7qdB   
    if(hCallWnd[index]==NULL) E clsOBg  
     continue; Owh:(EJ"d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^n\g,  
    { u#3Cst8Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); qf%p#+:B3  
     bProcessed=TRUE; cOP%R_ak?  
    } e^hI[LbNC  
   } ZPHatC  
  } G52z5-=v  
  else if((lParam&0xc000ffff)==1){ //有键按下 ^YEMR C  
   switch(wParam) kB-<17  
   { rwAycW7  
    case VK_MENU: 5"Y:^_8  
     MaskBits|=ALTBIT; Ul|htB<1:  
     break; w X.]O!^X~  
    case VK_CONTROL: <"LA70Hkk  
     MaskBits|=CTRLBIT; q)tNH/  
     break; ]yas]5H   
    case VK_SHIFT: @$?*UI6y  
     MaskBits|=SHIFTBIT; =Unu>p}2V  
     break; U2(mWQ[mO  
    default: //judge the key and send message fc%C!^7  
     break; Z'c9xvy5  
   } NHzVA*f  
   for(int index=0;index<MAX_KEY;index++){ W1O Y}2kj  
    if(hCallWnd[index]==NULL) L#/<y{  
     continue; p%e/>N.P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (KT+7j0^  
    { Kp/l2?J"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;oRgg'k<  
     bProcessed=TRUE; Vc "+|^  
    } Oi~.z@@  
   } 7*47mJyc  
  } v0+$d\mP4<  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 jft@ 'W53  
   for(int index=0;index<MAX_KEY;index++){ #M:Vwn JX  
    if(hCallWnd[index]==NULL) 5+*CBG}  
     continue; Dfd%Z;Yu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) DcZ,a E]  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \0^Je>-:U  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Njs'v;-K  
   } |f+fG=a67V  
  } CSMx]jbb  
 } r7  *'s  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); FdMTc(>  
} iKgH :[j  
=OooTZb:x-  
  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: R,W w/D  
Gv 6#LcF#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); EBplr ,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J|dj`Z ?  
2Xp?O+b#"O  
  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: bcFZ ~B  
DgC;1U'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) w0fFm"A|W  
{ stlkt>9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) /??nO Vvt  
 { CrEC@5 j  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Na_O :\x#  
  SaveBmp(); !o8(9F  
  return FALSE; ~*ll,<L:  
 } IVSd,AR7yY  
 …… //其它处理及默认处理 LW+^m6O  
} v,,Dz8!Ty  
LT) G"U~  
l\~F0Z/O  
  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。 k54Vh=p  
zgA/B{DaC;  
  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。 c=~FXV!  
z<n&P7k5j  
  二、编程步骤 0o-KjX?kP  
M`.v/UQn  
  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"; dO\irv)  
K1^x+I7%U[  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; [V.#w|n  
8hm|9  
  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; lAx^!#~\  
##qs{s^ ]  
  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; ^`oyf{w@  
+umVl  
  5、 添加代码,编译运行程序。 63y&MaqSJ  
p>GxSE)  
三、程序代码 jsnk*>j  
3+2cD  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 4Rev7Mc  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) YVB\9{H?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ V<G=pPC'H  
#if _MSC_VER > 1000 SFx|9$hXm  
#pragma once  oN7JNMT  
#endif // _MSC_VER > 1000 v6`TbIq%  
#ifndef __AFXWIN_H__ WEFvJ0]  
#error include 'stdafx.h' before including this file for PCH [DO UIR9  
#endif !_My]>S  
#include "resource.h" // main symbols k874tD  
class CHookApp : public CWinApp gl~>MasV&  
{ ;33LuD<h.  
 public: l9Sx'<  
  CHookApp(); ^+zhzfJ  
  // Overrides yUzpl[*e^o  
  // ClassWizard generated virtual function overrides 2[R{IV8e  
  //{{AFX_VIRTUAL(CHookApp) f|X./J4Bl  
 public: vTY+J$N__  
  virtual BOOL InitInstance(); E||[(l,b  
  virtual int ExitInstance(); XF 8$D  
  //}}AFX_VIRTUAL fd} U l  
  //{{AFX_MSG(CHookApp) }D>nXhO&  
  // NOTE - the ClassWizard will add and remove member functions here. ?XNQ_m8f  
  // DO NOT EDIT what you see in these blocks of generated code !  ^q=D!g  
  //}}AFX_MSG 8Qt'Y9|  
  DECLARE_MESSAGE_MAP() :;(zA_-  
}; dJ}E,rW}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); DHlCus=ic  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,Bg)p_B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u!VAAX  
BOOL InitHotkey(); WfDpeXdO  
BOOL UnInit(); b;XUv4~V  
#endif 8V$:th('  
aOH$}QnS  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. >u:t2DxE  
#include "stdafx.h" ZfYva(zP{Q  
#include "hook.h" "Wz#<! .r  
#include <windowsx.h> w[S!U<9/  
#ifdef _DEBUG *>a+`|[1*  
#define new DEBUG_NEW \Gk4J<  
#undef THIS_FILE r- ];@  
static char THIS_FILE[] = __FILE__; &eHhj9  
#endif ~Yw`w 2  
#define MAX_KEY 100 NlS/PWc6(  
#define CTRLBIT 0x04 B8'e,9   
#define ALTBIT 0x02 C \B&'+uR  
#define SHIFTBIT 0x01 lnk`D(>W  
#pragma data_seg("shareddata") 1k *gbXb  
HHOOK hHook =NULL; q{?ku!cL  
UINT nHookCount =0; 7z=zJ4C  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey _*SA_.0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT {{WA=\N8C  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 1b,,uI_  
static int KeyCount =0; ^K#PcPF-j  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift UE[5Bw?4X  
#pragma data_seg() QKAo}1Pq  
HINSTANCE hins; u&!QP4$"z  
void VerifyWindow(); ^\z.E?v%  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ^MUSq(  
//{{AFX_MSG_MAP(CHookApp) l#W9J.q(  
// NOTE - the ClassWizard will add and remove mapping macros here. &F*L=Ng  
// DO NOT EDIT what you see in these blocks of generated code! Tjfg[Z/x  
//}}AFX_MSG_MAP H|1owmbD  
END_MESSAGE_MAP() YB^[HE\#y  
&3Q!'pJJ  
CHookApp::CHookApp() 'ow`ej  
{ S-^RZ"  
 // TODO: add construction code here, q^e4  
 // Place all significant initialization in InitInstance 'n9<z)/,!  
} 2&f] v`|M|  
|-W7n'n  
CHookApp theApp; J5Nz<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4+Sq[Rv0  
{ >>**n9\q  
 BOOL bProcessed=FALSE; H>x(c|ZBp  
 if(HC_ACTION==nCode) XQW+6LEQ  
 { x2|YrkGv  
  if((lParam&0xc0000000)==0xc0000000){// Key up RGw=!0V  
   switch(wParam) |hp_<F9.  
   { 1 h.=c  
    case VK_MENU: (o!v,=# 6{  
     MaskBits&=~ALTBIT; BrdHTk= Vy  
     break; 8b0!eB#_Ee  
    case VK_CONTROL: eVobs2s  
     MaskBits&=~CTRLBIT; x-Kq=LFy.  
     break; 1^*M*>&d<  
    case VK_SHIFT: yEnurq%J  
     MaskBits&=~SHIFTBIT; |a(%a43fC  
     break; mG? g  
    default: //judge the key and send message O>Vb7`z0<  
     break; QJL%J  
   } /kl41gx  
   for(int index=0;index<MAX_KEY;index++){ QEe\1>1"&  
    if(hCallWnd[index]==NULL) l (EDe  
     continue; y<Hka'(%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =*VKp{5=  
    { Hh_Yd)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Sn I-dXNF  
     bProcessed=TRUE; e/pZLj]M  
    } PdUlwT? 8C  
   } OJ (ho&((  
  } XYJ7k7zc+Y  
  else if((lParam&0xc000ffff)==1){ //Key down '[E|3K5d  
   switch(wParam) )ZU)$dJ>V  
   { Vv"JN?dHi  
    case VK_MENU: <oweLRt  
     MaskBits|=ALTBIT; cs]N%M^s  
     break; e)pQh& uD  
    case VK_CONTROL: O]"3o,/]G  
     MaskBits|=CTRLBIT; *SW.K{{  
     break; 6TN!63{Cz  
    case VK_SHIFT: wT;3>%Mtr  
     MaskBits|=SHIFTBIT; &+@~;p 5F  
     break; -dCM eC  
    default: //judge the key and send message Q}pnb3J>T  
     break; D(EY"s37  
   } BoJYP  
   for(int index=0;index<MAX_KEY;index++) So&an !  
   { {[r}&^K15  
    if(hCallWnd[index]==NULL) 9ANC,+0p  
     continue; 8<,b5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) vx:MLmZ.  
    { mN5`Fct*A>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~hubh!d=  
     bProcessed=TRUE; 28 h3Ayw4  
    } _R&}CP  
   } 1ga-8&!  
  } :)!X%2 _  
  if(!bProcessed){ yv.Y-c=  
   for(int index=0;index<MAX_KEY;index++){ u"rK5'  
    if(hCallWnd[index]==NULL) L0v& m  
     continue; Oeua<,]Z~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1b4aY> Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $U,`M"  
   } SfKm]Z>Hp  
  } DU_38tz  
 } TTg>g~t`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); e-$ U .cx  
} +UzFHiGy#  
+f{CfWIKs  
BOOL InitHotkey()  2C9wOO  
{ Gp=X1 F  
 if(hHook!=NULL){ #St=%!  
  nHookCount++; [ \I&/?On  
  return TRUE; 8"!Z^_y)  
 } }*WNrS">S  
 else Y{].%xM5  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); =@#[@Ia  
  if(hHook!=NULL) SU0K#:  
   nHookCount++; UjmBLXz@T  
  return (hHook!=NULL); ]+1?T)<!  
} s?;rP,{:p  
BOOL UnInit() ^i3~i?\,P  
{ f/spJ<B).4  
 if(nHookCount>1){ _xgF?#  
  nHookCount--; i^c  
  return TRUE; Yjv[rH5v  
 } #UR4I2t*  
 BOOL unhooked = UnhookWindowsHookEx(hHook); g8 (zvG;Y  
 if(unhooked==TRUE){ 7U#`^Q}  
  nHookCount=0; Vp =  
  hHook=NULL; `aY{$>$S  
 } %@IZ41<C  
 return unhooked; l26DPtWi  
} hZ0p /Bdv  
s : c  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I!(.tu6u6c  
{ ;Qpp`  
 BOOL bAdded=FALSE; 9Y:JA]U&8  
 for(int index=0;index<MAX_KEY;index++){ 8'=8!V  
  if(hCallWnd[index]==0){ z7+y{-{Z  
   hCallWnd[index]=hWnd; &KfRZ`9H  
   HotKey[index]=cKey; b .9]b  
   HotKeyMask[index]=cMask; ],ow@}  
   bAdded=TRUE; Xg*IOhF6x  
   KeyCount++; 8l|v#^v  
   break; vkE[Ur>  
  } 8i!~w 7z  
 } M[5zn  
 return bAdded; 'jp nQcwxx  
} 9moenkL  
*wW/nr=\;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !:Lb^C;/  
{ >SJ# rZ  
 BOOL bRemoved=FALSE; @";z?xj  
 for(int index=0;index<MAX_KEY;index++){ o[AQS`  
  if(hCallWnd[index]==hWnd){ {;4AdZk  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]JQk,<l5E  
    hCallWnd[index]=NULL; AL/`Pqlk  
    HotKey[index]=0; k[oU}~*U+  
    HotKeyMask[index]=0; -Z&6PT7  
    bRemoved=TRUE; Ba/Z<1)  
    KeyCount--; zGFo -C  
    break; O`e0r%SJ  
   } ^n5[pF}Gw  
  } Ij>x3L\-  
 } dbGW`_zQ4  
 return bRemoved; fRo_rj _  
} z^ +CD-  
Wt+aW  
void VerifyWindow() _5Q?]-M  
{ )%8oE3O#  
 for(int i=0;i<MAX_KEY;i++){ +r)'?zU  
  if(hCallWnd!=NULL){ 70! &  
   if(!IsWindow(hCallWnd)){ P/._ tQu6  
    hCallWnd=NULL; {H eIY2  
    HotKey=0; o uKID_ '  
    HotKeyMask=0; UJkg|eu  
    KeyCount--; ,)A^3Q*  
   } 7G}vQO  
  } 10 dVV[=  
 } yEt:g0Z \  
} D3yG@lIP3  
ZjLzS]\a  
BOOL CHookApp::InitInstance() ^GdU$%aa  
{ MP,l*wVd  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); /=4P< &J  
 hins=AfxGetInstanceHandle(); 8Dpf{9Y-E  
 InitHotkey(); ]B0 >r^  
 return CWinApp::InitInstance(); b3e:F{n ^  
} w[PWJ! <  
qOz,iR?}  
int CHookApp::ExitInstance() NtMK+y  
{ F.?`<7  
 VerifyWindow(); /_E:sI9(  
 UnInit(); aR.1&3fE  
 return CWinApp::ExitInstance(); U7J0&  
} xI'<4lo7Z  
m` cw:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file wJh|$Vn  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Y."ujo#bB  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %*P59%  
#if _MSC_VER > 1000 %JDG aG'  
#pragma once 12Qcjj%F*  
#endif // _MSC_VER > 1000 R|H9AM ~E  
49}yw3-  
class CCaptureDlg : public CDialog [8.ufpZ  
{ "xZ]i)  
 // Construction 2;%DE<Z  
 public: ?*E Y~'I  
  BOOL bTray; {rGq|Bj  
  BOOL bRegistered; S5d:?^PGg  
  BOOL RegisterHotkey(); Mm-FdP m  
  UCHAR cKey; #/@U|g  
  UCHAR cMask; &'Qz  
  void DeleteIcon(); g~.,-V}  
  void AddIcon(); FQB)rxP  
  UINT nCount; ( gO?-0  
  void SaveBmp(); WKX5Dl  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?AP2Opsl  
  // Dialog Data k);z}`7  
  //{{AFX_DATA(CCaptureDlg) y?<[g;MuT  
  enum { IDD = IDD_CAPTURE_DIALOG }; %0INtq  
  CComboBox m_Key; rB?u.jn0T  
  BOOL m_bControl; KSVIX!EsX  
  BOOL m_bAlt; wQ!~c2a<8  
  BOOL m_bShift; 9:A>a3KOH  
  CString m_Path; 5}9-)\8=z  
  CString m_Number; [{N i94:d  
  //}}AFX_DATA vX)6N#D!  
  // ClassWizard generated virtual function overrides Ql%7wrK  
  //{{AFX_VIRTUAL(CCaptureDlg) =nFT0];  
 public: B+);y  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9 f-T>}  
 protected: Zqd&EOm  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support J:f>/  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); J><O 51  
  //}}AFX_VIRTUAL t2p/NIn  
  // Implementation yt>Pf <AI  
 protected: &o^wgmS   
  HICON m_hIcon; C-qsyJgZy  
  // Generated message map functions \q Q5x  
  //{{AFX_MSG(CCaptureDlg) %2BFbaE  
  virtual BOOL OnInitDialog(); ro@Zbm;P  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); r{)d?Ho=  
  afx_msg void OnPaint(); FO_nS   
  afx_msg HCURSOR OnQueryDragIcon(); qS&PMQ"$  
  virtual void OnCancel(); Z/q%%(fh 0  
  afx_msg void OnAbout(); "x9xJ  
  afx_msg void OnBrowse(); 2-llT  
  afx_msg void OnChange(); Qu!\Cx@  
 //}}AFX_MSG Rt7}e09HV  
 DECLARE_MESSAGE_MAP() M=yZ5~3  
}; "c!s\iuBU  
#endif ||`w MWq  
}S*6+4  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;zs*Zd7h M  
#include "stdafx.h" :FG}k Y  
#include "Capture.h" [w=x0J&  
#include "CaptureDlg.h" hNDhee`%6  
#include <windowsx.h> <kLY1 EILM  
#pragma comment(lib,"hook.lib") ]~?k%Mpw  
#ifdef _DEBUG "oz @w'rG  
#define new DEBUG_NEW CSr{MF`]e  
#undef THIS_FILE MF 5w.@62X  
static char THIS_FILE[] = __FILE__; rO]C`bg  
#endif b8b-M]P-=  
#define IDM_SHELL WM_USER+1 O b8[P=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &=HM}h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); KNY<"b  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 07(E/A]  
class CAboutDlg : public CDialog #> CN,eiZ  
{ =7e8N&-nv  
 public: n:wn(BC3  
  CAboutDlg(); |o!<@/iH=  
  // Dialog Data <(f4#B P  
  //{{AFX_DATA(CAboutDlg) `b\4h/~  
  enum { IDD = IDD_ABOUTBOX }; EAY9~b6~c  
  //}}AFX_DATA GC4$9q}C4Z  
  // ClassWizard generated virtual function overrides e3S6+H),I  
  //{{AFX_VIRTUAL(CAboutDlg) } \823 U %  
 protected: }rO4b>J  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support DVB:8"Bu  
  //}}AFX_VIRTUAL e. [+xOu`  
  // Implementation ,7j`5iq[m  
 protected: =x7ODBYW^  
  //{{AFX_MSG(CAboutDlg) (XW#,=rYk  
  //}}AFX_MSG wSAm[.1i  
  DECLARE_MESSAGE_MAP() ADR`j;2  
}; &Mc mA  
Ce0I8B2y  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) rW`F|F%  
{ w}YHCh  
 //{{AFX_DATA_INIT(CAboutDlg) gIRCJ=e[b  
 //}}AFX_DATA_INIT ~f@<]  
} v,M2|x\r}  
RF;N]A?*  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) VtKN{sSnu  
{ [ =9R5.)c  
 CDialog::DoDataExchange(pDX); :w];N|48s  
 //{{AFX_DATA_MAP(CAboutDlg) *jJ62-o  
 //}}AFX_DATA_MAP a6]!4  
} ALw uw^+  
S5d{dTPq  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) b~Ruhi[E  
 //{{AFX_MSG_MAP(CAboutDlg) r]E$uq bR  
 // No message handlers TtvS|09p;  
 //}}AFX_MSG_MAP [-CG&l2?L  
END_MESSAGE_MAP() 1z`,*eD7  
T+[e6/|  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) {10ms_s  
: CDialog(CCaptureDlg::IDD, pParent) 2tbqmWw/s  
{ c !;wp,c  
 //{{AFX_DATA_INIT(CCaptureDlg) /Mk)H d  
  m_bControl = FALSE; oby*.61?5l  
  m_bAlt = FALSE; $e_ps~{7$  
  m_bShift = FALSE; {Q-U=me\  
  m_Path = _T("c:\\"); OP&[5X+Y  
  m_Number = _T("0 picture captured."); J{Ay(  
  nCount=0; N0piL6Js  
  bRegistered=FALSE; dL\8^L  
  bTray=FALSE; xC{NIOYn'  
 //}}AFX_DATA_INIT };j&)M  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 nZT@d;]U9  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~h@tezF  
} Y]lqtre*Y  
Ocb2XEF  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 7X|r';"?i  
{  n=&c5!  
 CDialog::DoDataExchange(pDX); >ob/@  
 //{{AFX_DATA_MAP(CCaptureDlg) 3/AUV%+  
  DDX_Control(pDX, IDC_KEY, m_Key); 42u\Y_^ID  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); vhHMxOZ;  
  DDX_Check(pDX, IDC_ALT, m_bAlt); VMWg:=~$  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); X2`>@GR/>  
  DDX_Text(pDX, IDC_PATH, m_Path); LnDj   
  DDX_Text(pDX, IDC_NUMBER, m_Number); _y9P]@Q7%  
 //}}AFX_DATA_MAP 6:,^CI|@ t  
} ["F,|e{y$  
>S!DIL  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) [!le 9aNg  
//{{AFX_MSG_MAP(CCaptureDlg) ]'Yw#YB  
 ON_WM_SYSCOMMAND() f*],j  
 ON_WM_PAINT() DSC4  
 ON_WM_QUERYDRAGICON() dO[4}FZ$  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) bw\=F_>L  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) !`_f\  
 ON_BN_CLICKED(ID_CHANGE, OnChange) j 7 URg>i0  
//}}AFX_MSG_MAP 0vp I#q  
END_MESSAGE_MAP() 50&F#v%YB  
fYy.>m+P1  
BOOL CCaptureDlg::OnInitDialog() F 29AjW86  
{ %?hLo8  
 CDialog::OnInitDialog(); e_], O_ Z  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); md"%S-a_dT  
 ASSERT(IDM_ABOUTBOX < 0xF000); kDq%Y[6Z  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;#9| l=  
 if (pSysMenu != NULL) l;A_Aii(  
 { ]5f M?:<l  
  CString strAboutMenu; P@YL.'KU)  
  strAboutMenu.LoadString(IDS_ABOUTBOX); #&83;uys  
  if (!strAboutMenu.IsEmpty()) 3 \r@f_p  
  { df *#?Ok  
   pSysMenu->AppendMenu(MF_SEPARATOR); <UJJ],)^1A  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); L_"(A #H:  
  } AJfi,rFPg  
 } kA!(}wRL  
 SetIcon(m_hIcon, TRUE); // Set big icon c)MR+'d\WO  
 SetIcon(m_hIcon, FALSE); // Set small icon L5 9oh  
 m_Key.SetCurSel(0); ;J-Ogt@d7  
 RegisterHotkey(); rs Uw(K^  
 CMenu* pMenu=GetSystemMenu(FALSE); DXW?;|8)O  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); $sF#Na4^  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :ZS 8Zm"  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 3D{4vMm X  
 return TRUE; // return TRUE unless you set the focus to a control h5rP]dbhXU  
} Sn2Ds)Pfx3  
C'/M/|=Q#  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Z,!Xxv;4  
{ ^>8]3@ Nh  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) H r^15  
 { 5A$az03y$\  
  CAboutDlg dlgAbout; lzs(i 2pA  
  dlgAbout.DoModal(); l$VxE'&LQ  
 } LQ\ ELJj  
 else /~l/_Jct@G  
 { 8;g.3Qv  
  CDialog::OnSysCommand(nID, lParam); R``V Q  
 } t9n   
} O {6gNR,*  
Uc_`Eh3y  
void CCaptureDlg::OnPaint() uxC   
{ _SIs19"lR  
 if (IsIconic()) _lPl)8k  
 { M&djw`B  
  CPaintDC dc(this); // device context for painting J'ZFIT_>  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); r` `i C5Ii  
  // Center icon in client rectangle FK@ f'  
  int cxIcon = GetSystemMetrics(SM_CXICON); _A,-[*OKI  
  int cyIcon = GetSystemMetrics(SM_CYICON); cxD}t'T  
  CRect rect; ))IgB).3M  
  GetClientRect(&rect); ()C^ta_]  
  int x = (rect.Width() - cxIcon + 1) / 2; 85|95P.<  
  int y = (rect.Height() - cyIcon + 1) / 2; |c oEBFG  
  // Draw the icon d@6:|auO  
  dc.DrawIcon(x, y, m_hIcon); 5G'&9{oB  
 } c[h'`KXJf-  
 else t}XB|h  
 { _7=pw5[  
  CDialog::OnPaint(); *]m kyAhi  
 } k>:/D  
} _)#=>$k\  
)7I.N]=  
HCURSOR CCaptureDlg::OnQueryDragIcon() /=muj9|+s  
{ lbKv  
 return (HCURSOR) m_hIcon;  hmBnV  
} ayH%  qp  
d4p{5F7]^  
void CCaptureDlg::OnCancel() &ppE|[{  
{ h\=p=M  
 if(bTray) xH"W}-#[  
  DeleteIcon(); $kkp*3{ot  
  CDialog::OnCancel(); }_a +X  
} "#-Nqq  
R0Ax$Cv{  
void CCaptureDlg::OnAbout() `R=a@DQ  
{ iHE0N6%q  
 CAboutDlg dlg; 7 >PF~=  
 dlg.DoModal(); e8d5(e  
} y:g7'+c  
e;A^.\SP  
void CCaptureDlg::OnBrowse() _W@,@hOH  
{ =2RhPD  
 CString str; -+3be(u  
 BROWSEINFO bi; vQ-i xh  
 char name[MAX_PATH]; {yvb$ND|j{  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); )l+XDI  
 bi.hwndOwner=GetSafeHwnd(); JqI6k6~Q^  
 bi.pszDisplayName=name; ?%cn'=>ZI  
 bi.lpszTitle="Select folder"; zW"~YaO%C  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; S2J#b"Y  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6 QN1+MwB  
 if(idl==NULL) c;c:Ea5  
  return; !lR0w|  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); /]ku$.mr\  
 str.ReleaseBuffer(); _MM   
 m_Path=str; gB(9vhj $  
 if(str.GetAt(str.GetLength()-1)!='\\') y#b;uDY  
  m_Path+="\\"; uk`T+@K  
 UpdateData(FALSE); 9 '2=  
}  M*d-z  
OOCQsoN  
void CCaptureDlg::SaveBmp() kx|me~I  
{ ' 2>l  
 CDC dc; iKg75%;t  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %z(9lAe  
 CBitmap bm; ~_ *H)|  
 int Width=GetSystemMetrics(SM_CXSCREEN); LWD.  
 int Height=GetSystemMetrics(SM_CYSCREEN); $GQphXb$  
 bm.CreateCompatibleBitmap(&dc,Width,Height); y7CWBTH0>  
 CDC tdc; jMK3T  
 tdc.CreateCompatibleDC(&dc); ,/~[S  
 CBitmap*pOld=tdc.SelectObject(&bm); 66oK3%[  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ;5<P|:^  
 tdc.SelectObject(pOld); 3"5.eZSOW  
 BITMAP btm; ;xL67e%?  
 bm.GetBitmap(&btm); GA.BI"l  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ] } '^`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Y mq3ty]Pe  
 BITMAPINFOHEADER bih; O'fk&&l  
 bih.biBitCount=btm.bmBitsPixel; .\$Wy$ d  
 bih.biClrImportant=0; ?~!tM}X0:3  
 bih.biClrUsed=0; 8fnR1mWG  
 bih.biCompression=0; d;{y`4p)s  
 bih.biHeight=btm.bmHeight; 1:_=g#WH  
 bih.biPlanes=1; moCK- :  
 bih.biSize=sizeof(BITMAPINFOHEADER); &(g|="T  
 bih.biSizeImage=size; Z #EvRC  
 bih.biWidth=btm.bmWidth; :ztyxJv1  
 bih.biXPelsPerMeter=0; <_t5:3HL  
 bih.biYPelsPerMeter=0; sD2 ^_w6j  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); VQ2Fnb4  
 static int filecount=0; P Q,+hq  
 CString name; f7Zf}1|  
 name.Format("pict%04d.bmp",filecount++); )Lb72;!?  
 name=m_Path+name; 9/G!0uE  
 BITMAPFILEHEADER bfh; aRX  
 bfh.bfReserved1=bfh.bfReserved2=0; zwnw'  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 85} ii{S  
 bfh.bfSize=54+size; r ^MiRa  
 bfh.bfOffBits=54; 7gm:ZS   
 CFile bf; dN<5JQql  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ *E}Oh  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); b{BaQ>.(`  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); q@%h^9.  
  bf.WriteHuge(lpData,size); \BUqDd!  
  bf.Close(); v~}5u 5 $O  
  nCount++; c#  xO<  
 } EMh r6</  
 GlobalFreePtr(lpData); (`pNXQ0n  
 if(nCount==1) 9\>sDSCx  
  m_Number.Format("%d picture captured.",nCount); [^M|lf   
 else pisB,wP$2  
  m_Number.Format("%d pictures captured.",nCount); 3%2jwR  
  UpdateData(FALSE); UQ~4c,  
} lBmm(<~Z  
wLUF v(&C  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5z~\5x  
{ "5}%"-#  
 if(pMsg -> message == WM_KEYDOWN) ]\BUoQ7I/  
 { d&u 7]<yDA  
  if(pMsg -> wParam == VK_ESCAPE) )v1CC..  
   return TRUE; (]XbPW  
  if(pMsg -> wParam == VK_RETURN) sPy2/7Wqd  
   return TRUE; zKxvN3!  
 } f;wc{qy  
 return CDialog::PreTranslateMessage(pMsg); On&L#pf  
} 4V$fGjJ3  
k2p'G')H  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {a@>6)  
{ %2D17*eK  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ j#VIHCzlr  
  SaveBmp(); KDD@%E  
  return FALSE; e:OyjG5_  
} ^=0 $  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 7~b!4x|Z  
 CMenu pop; Yj|]Uff8O  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); /C$ xH@bb  
 CMenu*pMenu=pop.GetSubMenu(0); 94{)"w]  
 pMenu->SetDefaultItem(ID_EXITICON); Q0~j$Jc  
 CPoint pt; 6Y7H|>g)  
 GetCursorPos(&pt); 6^E`Sa! s  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); FZXyfZw!|  
 if(id==ID_EXITICON) `G?qY8  
  DeleteIcon(); e g3L:rk_  
 else if(id==ID_EXIT) JMlV@t7y<  
  OnCancel(); <'&F;5F3V  
 return FALSE; p)3nyN=|_  
} ((|IS[  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); !;dSC<   
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) a2yE:16o6  
 AddIcon(); =& -[TPW  
 return res; 8Kk\*8 <  
} 0E6lmz`O  
VVuR+=.&  
void CCaptureDlg::AddIcon() 8!zb F<W9  
{ B4yh3cf  
 NOTIFYICONDATA data; T2weAk#J  
 data.cbSize=sizeof(NOTIFYICONDATA); S|K}k:v8  
 CString tip; t1ze-Ht;  
 tip.LoadString(IDS_ICONTIP); w`gyE 6A  
 data.hIcon=GetIcon(0); 6OB",  
 data.hWnd=GetSafeHwnd(); V1utUGJV  
 strcpy(data.szTip,tip); .Yx_:h=u  
 data.uCallbackMessage=IDM_SHELL; ?QpNjsF  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; QCpM|,drS  
 data.uID=98; , 2`~ NPb  
 Shell_NotifyIcon(NIM_ADD,&data); !/hsJ9  
 ShowWindow(SW_HIDE); 3nFt1E   
 bTray=TRUE; "&QH6B1U6H  
} 5~r2sCDPk  
&5Y_>{,  
void CCaptureDlg::DeleteIcon() P`"mM?u  
{ =|SdVv   
 NOTIFYICONDATA data; <KQ(c`KW7  
 data.cbSize=sizeof(NOTIFYICONDATA); .y):Rh^  
 data.hWnd=GetSafeHwnd(); 4tJa-7  
 data.uID=98; HI!4  
 Shell_NotifyIcon(NIM_DELETE,&data); NK/4OAt%  
 ShowWindow(SW_SHOW); z~Na-N  
 SetForegroundWindow(); Q~Ea8UT. #  
 ShowWindow(SW_SHOWNORMAL); 2]ti!<  
 bTray=FALSE; pbn\9C/  
} [,g~m9  
D7Zm2Kj  
void CCaptureDlg::OnChange() `fS^ j-_M  
{ *<9$D  
 RegisterHotkey(); C2/}d? bki  
} 4~|<` vqN  
T+CajSV  
BOOL CCaptureDlg::RegisterHotkey() K2ewucn  
{ .\)A@ua^  
 UpdateData(); jv&+<j`r  
 UCHAR mask=0; L`3n2DEBf  
 UCHAR key=0; (|u31[  
 if(m_bControl) ~UPZ<  
  mask|=4; -cfx2;68  
 if(m_bAlt) n?QZFeI`  
  mask|=2; _T*AC.  
 if(m_bShift) 1"]P`SY$r  
  mask|=1; 8MF2K6  
  key=Key_Table[m_Key.GetCurSel()]; !7 _\P7M  
 if(bRegistered){ DTY<0Q.  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); <avQR9'&  
  bRegistered=FALSE; DW2>&|  
 } nSS=%,?  
 cMask=mask; f)6))  
 cKey=key; N|dD!  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); :zp`6l  
 return bRegistered; "J19*<~  
} I}.i@d'O  
dM]#WBOP y  
  四、小结 oU+F3b}5p  
C`K^L=8`{  
  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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