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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: oTa! F;I  
  4l$8lYi  
  一、实现方法 &y(aByI y  
"5y^s!/  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: FBY~Z$o0.  
l&|{uk  
#pragma data_seg("shareddata") !k s<VJh  
HHOOK hHook =NULL; //钩子句柄 =~0XdS/1  
UINT nHookCount =0; //挂接的程序数目 YD+C1*c!  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 YKx0Zs  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 [ThzLk#m  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey bs`/k&'  
static int KeyCount =0; wcL0#[)  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ~o2{Wn["  
#pragma data_seg() %qE#^ U  
{ a_L /"7  
  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。 -{7N]q)}  
&&y@/<t  
  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: =[jBOx&  
zp9 ?Ia  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR o>*{5>#k'  
cKey,UCHAR cMask) ]_pL79y  
{ -[`W m7en  
 BOOL bAdded=FALSE; 5:PZ=jPR  
 for(int index=0;index<MAX_KEY;index++){ 8/F2V?iT  
  if(hCallWnd[index]==0){ R|M:6]}   
   hCallWnd[index]=hWnd; s24H.>Z  
   HotKey[index]=cKey; $U0(%lIU  
   HotKeyMask[index]=cMask; MnS"M[y3  
   bAdded=TRUE; @'rO=(-b  
   KeyCount++; % (.PRRI  
   break; ;C{_T:LS  
  } *AA1e}R{B  
 } #rC/y0niH  
 return bAdded; GbE3 :;JI  
} vOj$-A--qU  
//删除热键 e=R} 4`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dog,vUu  
{ 7, 4x7!  
 BOOL bRemoved=FALSE; :_H88/?RR  
 for(int index=0;index<MAX_KEY;index++){ *&PgDAQ  
  if(hCallWnd[index]==hWnd){ jFc{$#g-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ x!jhWX  
    hCallWnd[index]=NULL; POG5x  
    HotKey[index]=0; ( 0h]<7  
    HotKeyMask[index]=0; SeTU`WLEm  
    bRemoved=TRUE; y5ExEXa  
    KeyCount--; |S8pq4eKJ_  
    break; C,]Ec2  
   } GGuLxc?(  
  } 3TtW2h>M  
 } h P1|l  
 return bRemoved; #.='dSj  
} gi6_la+  
i,HAXPi  
,@;<u'1\G  
  DLL中的钩子函数如下: [y:LA ~q  
\'KzSkC8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) QezK&iJg  
{ ?l(hS\N,  
 BOOL bProcessed=FALSE; zN:752d^+r  
 if(HC_ACTION==nCode) Cf N; `  
 { <>Im$N ai  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ,rdM{ r  
   switch(wParam) G~]BC#nB_  
   {  3 /e !7  
    case VK_MENU: 1%+^SR72  
     MaskBits&=~ALTBIT; D5p22WY  
     break; FN R& :  
    case VK_CONTROL: k);!H+  
     MaskBits&=~CTRLBIT; 3YRzBf:h  
     break; r__M1 !3  
    case VK_SHIFT: %Fv)$ :b  
     MaskBits&=~SHIFTBIT; #?*jdN:  
     break; d0^2<  
    default: //judge the key and send message +x2xQ8#|~~  
     break; P:v y  
   } O+N-x8W{  
   for(int index=0;index<MAX_KEY;index++){ t]ZSo-  
    if(hCallWnd[index]==NULL) !jbjrzv9  
     continue; T,fz/5w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z|2liQrf+  
    { KOQTvJ_#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Bz{ g4!ku  
     bProcessed=TRUE; /b|sv$BN  
    } xpk|?/6  
   } {;zPW!G  
  } k y98/6  
  else if((lParam&0xc000ffff)==1){ //有键按下 X@)lPr$a  
   switch(wParam) 2$91+N*w9  
   { kYAvzuGRb  
    case VK_MENU: nGVqVSxKT  
     MaskBits|=ALTBIT; +9X[gef8  
     break; AL0Rn e N  
    case VK_CONTROL: i@* ^]'  
     MaskBits|=CTRLBIT; 9& j]  
     break; [;I8ZVE  
    case VK_SHIFT: gg(U}L ]:  
     MaskBits|=SHIFTBIT; #<o#kJL  
     break; ht |r+v-  
    default: //judge the key and send message >`:+d'Jv0  
     break; 63HkN4D4  
   } {E/TC%  
   for(int index=0;index<MAX_KEY;index++){ kXr%73s  
    if(hCallWnd[index]==NULL) ^XM;D/Gp~  
     continue; ]`prDw'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1GdD  
    { Q Y'-]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); lu_Gr=#O  
     bProcessed=TRUE; 5o/rV.I  
    } Jy_'(hG  
   } m"R(_E5  
  } g8Z14'Ke  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 8##jd[o&p~  
   for(int index=0;index<MAX_KEY;index++){ ^U}0D^jDeE  
    if(hCallWnd[index]==NULL) o[#a}5Y  
     continue; z"3c+?2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) (zBQ^97]  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ={^#E?  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 oK6lCGM5  
   } |BW,pT  
  } S2)S/ nf  
 } 3p4?-Dd|_$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %j@FZ )a[  
} &}O!l'  
jvQ"cs$.  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: }H=OVbQor  
e`r;`a&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {P&^Erx  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); J~q+G  
dI-5%Um  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: YW<2:1A|  
p/h&_^EXU  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ao T7sy7  
{ L])w-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Q8?D}h  
 { EcIQ20Z_-  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 M>@R=f  
  SaveBmp(); W1 Qc1T8  
  return FALSE; >nQ yF  
 } !\1W*6U8;  
 …… //其它处理及默认处理 Oq6n.:8g"  
} .h,xBT`}Ji  
KU,w9<~i(  
I0K!Kcu5Iu  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 09Y?!,  
}eM<A$J  
  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。 moR2iyO_  
de9l;zF  
  二、编程步骤 |`wsKr'  
=joXP$n^  
  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"; j_@3a)[NY  
K"7;Y#1g  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; K/`RZ!  
)1Nnn  
  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; RFY!o<   
-G#k/Rz6  
  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; .E#Sm?gK  
5Q`n6x|  
  5、 添加代码,编译运行程序。 'V#ew\  
N?0y<S ?!  
三、程序代码 1 ],, Ar5  
D 'cY7P  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL % VpBB  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) nM-SDVFM  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 8"mW!M  
#if _MSC_VER > 1000 D^55:\4(  
#pragma once a +yI2s4Z  
#endif // _MSC_VER > 1000 !m(L0YH  
#ifndef __AFXWIN_H__ ;bZ*6-\!-  
#error include 'stdafx.h' before including this file for PCH 1Uk~m  
#endif vN:[  
#include "resource.h" // main symbols uz3pc;0LPY  
class CHookApp : public CWinApp xY2_*#{.  
{ *)1Vs'!-  
 public: Wxau]uix  
  CHookApp(); 4UjE*Aq  
  // Overrides g)qnjeSs]  
  // ClassWizard generated virtual function overrides uhB!k-ir  
  //{{AFX_VIRTUAL(CHookApp) orH0M!OtS!  
 public: Fx5d@WNa>  
  virtual BOOL InitInstance(); 6L9[U^`@  
  virtual int ExitInstance(); P lH`(n#  
  //}}AFX_VIRTUAL $'YKB8C  
  //{{AFX_MSG(CHookApp) ggc?J<Dv  
  // NOTE - the ClassWizard will add and remove member functions here. w/5^R  
  // DO NOT EDIT what you see in these blocks of generated code ! y*h1W4:^-  
  //}}AFX_MSG #Jz&9I<OKx  
  DECLARE_MESSAGE_MAP() _/~ ,a  
}; +'KE T,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); W#I:j: p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,M.!z@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Y{vwOs  
BOOL InitHotkey(); QM_X2Ho  
BOOL UnInit(); <3=qLm  
#endif NLZZMr  
Du:p!nO  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. YQV?S  
#include "stdafx.h" An #Hb=  
#include "hook.h" s%[GQQ-N  
#include <windowsx.h> ywynx<Wg  
#ifdef _DEBUG Kt,yn A  
#define new DEBUG_NEW 34wM%@D*c  
#undef THIS_FILE dP7Vs a+  
static char THIS_FILE[] = __FILE__; F] ?@X  
#endif 4UD=Y?zK  
#define MAX_KEY 100 kEhm'  
#define CTRLBIT 0x04 ct4 [b|  
#define ALTBIT 0x02 E? eWv)//  
#define SHIFTBIT 0x01 }?]yxa~  
#pragma data_seg("shareddata") L3GC[$S  
HHOOK hHook =NULL; PuZs 5J3  
UINT nHookCount =0; Ocwp]Mut&  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey x2;i< |  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT '&:1?i)  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ( *>/w$%  
static int KeyCount =0; 2FIR]@MQd  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift FaE#\Q  
#pragma data_seg() hMeqs+  
HINSTANCE hins; w zqd g  
void VerifyWindow(); 1i/::4=  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) nt0\q'&  
//{{AFX_MSG_MAP(CHookApp) )R8%'X;U  
// NOTE - the ClassWizard will add and remove mapping macros here. Th^(f@.w  
// DO NOT EDIT what you see in these blocks of generated code! N^ s!!Sbpq  
//}}AFX_MSG_MAP dG-or  
END_MESSAGE_MAP() XQ 3*  
4Kn9*V  
CHookApp::CHookApp() mvq7G  
{  6Z&u  
 // TODO: add construction code here, ]osx.  
 // Place all significant initialization in InitInstance ]TBtLU3  
} o9Txo (tYU  
qwF*(pTHq  
CHookApp theApp;  S2&9# 6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) WVWS7N\  
{ n(1wdlEp  
 BOOL bProcessed=FALSE; 3p3WDL7  
 if(HC_ACTION==nCode) {[,Wn:  
 { zn V1kqGU  
  if((lParam&0xc0000000)==0xc0000000){// Key up )nNCB=YF!  
   switch(wParam) 6b ]1d04hT  
   { ZEj!jWP2m  
    case VK_MENU: /MKNv'5&!%  
     MaskBits&=~ALTBIT; 0SMQDs5j  
     break; w3=)S\  
    case VK_CONTROL: nx-1*  
     MaskBits&=~CTRLBIT; O~h94 B`  
     break; (D>y6r> r  
    case VK_SHIFT: XpgV09.EE  
     MaskBits&=~SHIFTBIT; k%]DT.cE  
     break; dv'E:R(a  
    default: //judge the key and send message Wm)-zvNY;  
     break; NFY|^*bll  
   } L$lo~7<]  
   for(int index=0;index<MAX_KEY;index++){ tS (i711  
    if(hCallWnd[index]==NULL) 7a:*Y"f,~  
     continue; 4@v1jJj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z|3`0eWIG  
    { qE0FgqRB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); <mZrR3v'D  
     bProcessed=TRUE; X a"XB  
    } lI4J=8O0  
   } F?b'L JS  
  } "7kgez#Y  
  else if((lParam&0xc000ffff)==1){ //Key down x2C/L  
   switch(wParam) =t3vbV  
   { p@/(.uE  
    case VK_MENU: M|UxE/  
     MaskBits|=ALTBIT; YX ;n6~y  
     break; (_w %  
    case VK_CONTROL: 4ZI!,lv*  
     MaskBits|=CTRLBIT; w%3Fg~Up  
     break; \E$1lc  
    case VK_SHIFT: ls"b#eFC#  
     MaskBits|=SHIFTBIT; %2Epgh4?  
     break; 5pRY&6So  
    default: //judge the key and send message ua`6M  
     break; z;dcAdz9  
   } k,,!P""  
   for(int index=0;index<MAX_KEY;index++) gX@nPZjg  
   { psIkG0 &  
    if(hCallWnd[index]==NULL) Hz}+SAZ  
     continue; xH<'GB)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +{xMIl_  
    { d"H<e}D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _W0OM[  
     bProcessed=TRUE; D =r-  
    } 50LHF %  
   } A&<?   
  } :1aL9 fT  
  if(!bProcessed){ CAUijMI@  
   for(int index=0;index<MAX_KEY;index++){ A\".t=+7  
    if(hCallWnd[index]==NULL) ;Z ]<S_#-  
     continue; ?R;nL{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 3sZ,|,ueD  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); uAu( +zV2  
   } $gVLk.  
  } of8mwnZR  
 } <ROpuY\!l  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); cMDRWh  
} Ia=_78MgZ  
k)`$%[K8  
BOOL InitHotkey() !0Idp%  
{ `n 3FT=  
 if(hHook!=NULL){ \F 3C=M@:  
  nHookCount++; M#OH Y *  
  return TRUE; j%pCuC&"  
 } =/6p#d*0  
 else }{ n\tzR  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); \Yj#2ww  
  if(hHook!=NULL) g<fDY6jt  
   nHookCount++; WP5VcBC  
  return (hHook!=NULL); aZ`<PdA  
} /61by$E  
BOOL UnInit() B?SNea,I4  
{ yeh8z:5Z O  
 if(nHookCount>1){ FZiZg;  
  nHookCount--; (%[Tk[  
  return TRUE; ~xS@]3n=  
 } jCzGus!rM  
 BOOL unhooked = UnhookWindowsHookEx(hHook); RCI4~q  
 if(unhooked==TRUE){ aH%ZetLNJ  
  nHookCount=0; 1Gsw-a;a  
  hHook=NULL; !:(C"}5wM  
 } np\st7&f6  
 return unhooked; "YJ[$TG  
} nO~b=qO  
|GtY*|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /D0RC  
{ <eY %sFq,  
 BOOL bAdded=FALSE; 75ZH  
 for(int index=0;index<MAX_KEY;index++){ cVp[ Z#B  
  if(hCallWnd[index]==0){ *4t-e0]j@w  
   hCallWnd[index]=hWnd; k({2yc#RD&  
   HotKey[index]=cKey; q(IZJGb  
   HotKeyMask[index]=cMask; :$=|7v  
   bAdded=TRUE; - %|P  
   KeyCount++; *zq.C  
   break; h40'@u^W  
  } a mqOxb  
 } {>@QJlE0  
 return bAdded; ! .AhzU1%Y  
} SSE3tcRRl  
pprejUR  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) czI{qi5N  
{ )!e3.C|V1W  
 BOOL bRemoved=FALSE; 9`B0fv Q&  
 for(int index=0;index<MAX_KEY;index++){ XYe~G@Q Z  
  if(hCallWnd[index]==hWnd){ ,yICNtP  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /}Yqf`CZy  
    hCallWnd[index]=NULL; Hle\ON  
    HotKey[index]=0; :r&iM b:Ra  
    HotKeyMask[index]=0; wUoiXi09  
    bRemoved=TRUE; Q"%QQo}}  
    KeyCount--; Z?17Pu'Dp  
    break; 0#QKVZq2>  
   } p%F8'2)}  
  } 3cqQL!Gm  
 } i'HPRY  
 return bRemoved; :[xvlW29  
} F.<L> G7{1  
bpW!iY/q3  
void VerifyWindow() 7:>sc]Z  
{ pz 7H To;p  
 for(int i=0;i<MAX_KEY;i++){ I5qM.@%zB  
  if(hCallWnd!=NULL){ 86%%n?"}  
   if(!IsWindow(hCallWnd)){ Yt+h2ft!  
    hCallWnd=NULL; ["a"x>X&  
    HotKey=0; (s s3A9tG  
    HotKeyMask=0; :\b|dvI<  
    KeyCount--; 6PU/{c  
   } D+sQPymI  
  } Sh&iQ_vq  
 } &~ *.CQa  
} k#C f})  
wK ?@.l)u  
BOOL CHookApp::InitInstance() 2ev*CX6.  
{ @4drjT  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1a$IrQE  
 hins=AfxGetInstanceHandle(); := <0=JE#  
 InitHotkey(); }_}KVI  
 return CWinApp::InitInstance(); t0Zk-/s  
} BC! 6O/kr  
U]hF   
int CHookApp::ExitInstance() hv>KX  
{ ZjD)? 4  
 VerifyWindow(); '^iUx,,ZQ  
 UnInit(); v^SsoX>WMH  
 return CWinApp::ExitInstance(); q8>t!rh<R  
} @TzvT3\q  
#6=MKpR  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file XWUP=D~  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) X*F_<0RC1  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ cJDd0(tD!  
#if _MSC_VER > 1000 M-J<n>hl  
#pragma once LL(|$}yW  
#endif // _MSC_VER > 1000 ZyI$M3{J  
0C$8g Y*  
class CCaptureDlg : public CDialog E  T:T7  
{ {\G `]r-cM  
 // Construction +;Cr];b3  
 public: V}" g~=  
  BOOL bTray; sI,W%I':d  
  BOOL bRegistered; Vr=OYI'A  
  BOOL RegisterHotkey(); PD6_)PXn  
  UCHAR cKey; raE Mm  
  UCHAR cMask; 19c@`?  
  void DeleteIcon(); 2&he($HIzg  
  void AddIcon(); c2 Aps  
  UINT nCount; ^m!_ 2_q  
  void SaveBmp(); 1J{fXh  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor <T+!V-Pj*  
  // Dialog Data &!L:"]=+  
  //{{AFX_DATA(CCaptureDlg) =']3(6*  
  enum { IDD = IDD_CAPTURE_DIALOG }; #.._c?%4/  
  CComboBox m_Key; Y$<D9f s3  
  BOOL m_bControl; pKT2^Q}-h  
  BOOL m_bAlt; ]Gv!M?:  
  BOOL m_bShift; RWKH%C[Yd  
  CString m_Path; FhkkW W L  
  CString m_Number; 3mO;JXd  
  //}}AFX_DATA c_.-b=zm  
  // ClassWizard generated virtual function overrides 9QwKakci  
  //{{AFX_VIRTUAL(CCaptureDlg) mwC=o5O  
 public: bsS:"/?>  
  virtual BOOL PreTranslateMessage(MSG* pMsg); SeEw.;Xw  
 protected: n~.*1. P  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support v2)g 1sXd  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &~~wX,6+  
  //}}AFX_VIRTUAL &nj&:?w  
  // Implementation "m$3)7 $  
 protected: " 6CMA 0R  
  HICON m_hIcon; /<Ld'J  
  // Generated message map functions i47j lyH  
  //{{AFX_MSG(CCaptureDlg) =0 qpVFvU  
  virtual BOOL OnInitDialog(); {"S6\%=  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); H8{ol6wc)6  
  afx_msg void OnPaint(); ]:ZdV9`  
  afx_msg HCURSOR OnQueryDragIcon(); ["3\eFg  
  virtual void OnCancel(); i7*EbaYzUO  
  afx_msg void OnAbout(); 4J0Rv od_  
  afx_msg void OnBrowse(); LWnR?Qve<  
  afx_msg void OnChange(); VT%:zf  
 //}}AFX_MSG o}$1Ay*q`  
 DECLARE_MESSAGE_MAP() "=1;0uy]  
}; |[$~\MU  
#endif x/ *-P b-_  
+4))/` DA  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;# uZhd  
#include "stdafx.h" 5!X1G8h)uy  
#include "Capture.h" O|kOI?f  
#include "CaptureDlg.h" 9?<{_'  
#include <windowsx.h> aUU7{o_Z  
#pragma comment(lib,"hook.lib") 3g~'5Ao  
#ifdef _DEBUG _S}A=hK'  
#define new DEBUG_NEW V  ~@^`Gd  
#undef THIS_FILE ,%9df+5k  
static char THIS_FILE[] = __FILE__; z (?=Iv3  
#endif m ci/'b Xt  
#define IDM_SHELL WM_USER+1 -7 U| a/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `=lc<T^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "N?+VkZEv  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; u #w29Pm  
class CAboutDlg : public CDialog m908jI_So  
{ v'!a\b`9  
 public: N$>^g"6 o  
  CAboutDlg(); iBTYY{-wF  
  // Dialog Data S! v(+|  
  //{{AFX_DATA(CAboutDlg) <{5EdX  
  enum { IDD = IDD_ABOUTBOX }; #S]ER907  
  //}}AFX_DATA qOih`dla  
  // ClassWizard generated virtual function overrides ar9]"s+'  
  //{{AFX_VIRTUAL(CAboutDlg) ;r[@v347  
 protected: Ej ".axjT  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support W2FD+ wt  
  //}}AFX_VIRTUAL _tTNG2  
  // Implementation gKYfQ+  
 protected: "ZM4F?x  
  //{{AFX_MSG(CAboutDlg) E_e6^Sk5B(  
  //}}AFX_MSG j>-gO,v, y  
  DECLARE_MESSAGE_MAP() 4%nE*H%  
}; q@t0NvNSu  
)G^ KDj"  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ",7Q   
{ *!s;"U  
 //{{AFX_DATA_INIT(CAboutDlg) i.D3'l  
 //}}AFX_DATA_INIT aI^/X {d  
} nw>8GivO  
9RN-suE[  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) /='. 4 v  
{ (3J$>Na  
 CDialog::DoDataExchange(pDX); .qMOGbd?  
 //{{AFX_DATA_MAP(CAboutDlg) 3b'QLfU&#  
 //}}AFX_DATA_MAP m< _S_c  
} ojyIQk+  
S"wR%\NIp  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7(5xL T$  
 //{{AFX_MSG_MAP(CAboutDlg) 5[0 O'%$  
 // No message handlers y{dTp  
 //}}AFX_MSG_MAP =  C4  
END_MESSAGE_MAP() EkgE_8  
&e 6CJ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) W`\R%>$H  
: CDialog(CCaptureDlg::IDD, pParent) e/0<[s*#Q  
{ x=ul&|^7D  
 //{{AFX_DATA_INIT(CCaptureDlg) qlL`jWJ  
  m_bControl = FALSE; TT =b79k  
  m_bAlt = FALSE; ]E\n9X-{  
  m_bShift = FALSE; ;;L[e]Z  
  m_Path = _T("c:\\"); 1 $/%m_t  
  m_Number = _T("0 picture captured."); }:X*7 n(&  
  nCount=0; +qh[N@F  
  bRegistered=FALSE; bFe+m1Q_  
  bTray=FALSE; /"eey(X  
 //}}AFX_DATA_INIT Jn{OWw2  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .C8PitS  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); sCR67/  
} =c/wplv*  
}ZYv~E'  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) fQ#l3@in  
{ +L7n<U3  
 CDialog::DoDataExchange(pDX); $STaQ28C  
 //{{AFX_DATA_MAP(CCaptureDlg) 1P~X8=9h  
  DDX_Control(pDX, IDC_KEY, m_Key); VeW>[08  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 7;KwLT9  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 6Yx4lWBR?  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); bbrXgQ`s+w  
  DDX_Text(pDX, IDC_PATH, m_Path); ^$b Y,CE  
  DDX_Text(pDX, IDC_NUMBER, m_Number);  o4|M0  
 //}}AFX_DATA_MAP E[/\7 v\  
} SQX:7YF~  
RhncBKm*M  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Ney/[3 A  
//{{AFX_MSG_MAP(CCaptureDlg) 8C*c{(4  
 ON_WM_SYSCOMMAND() <YdE1{fm  
 ON_WM_PAINT() z^'gx@YD*v  
 ON_WM_QUERYDRAGICON() S:h{2{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) xai*CY@cQ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) .Y&)4+ckL  
 ON_BN_CLICKED(ID_CHANGE, OnChange) : Zlwp6  
//}}AFX_MSG_MAP ;M)QwF1  
END_MESSAGE_MAP() z6*X%6,8  
N@t|7~  
BOOL CCaptureDlg::OnInitDialog() etTn_v  
{ r>o63Q:  
 CDialog::OnInitDialog();  #"@|f  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); *MKO I'  
 ASSERT(IDM_ABOUTBOX < 0xF000); \WxukYH  
 CMenu* pSysMenu = GetSystemMenu(FALSE); L7dd(^  
 if (pSysMenu != NULL) o,_? ^'@  
 { < jJ  
  CString strAboutMenu; OX\A|$GS  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 3yVMXK  
  if (!strAboutMenu.IsEmpty()) MF5[lK9e  
  { 0yD9SJn  
   pSysMenu->AppendMenu(MF_SEPARATOR); k?+?v?I =  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); .yz}ROmN^  
  } E=nIRG|g  
 } vSEuk}pk  
 SetIcon(m_hIcon, TRUE); // Set big icon y*qVc E  
 SetIcon(m_hIcon, FALSE); // Set small icon #d6)#:uss  
 m_Key.SetCurSel(0); { \81i8b]  
 RegisterHotkey(); o]4*|ARPs  
 CMenu* pMenu=GetSystemMenu(FALSE); ? m DI#~)  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); E|iQc8gr&  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); F(>Np2oi6  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); .+$ Q<L  
 return TRUE; // return TRUE unless you set the focus to a control 'Gj3:-xqL  
} 9Z4nAc  
RoPRQCE  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 3}}38A|4  
{ I>W=x'PkLn  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 6 (]Dh;gC  
 { fdFo#P  
  CAboutDlg dlgAbout; oKuI0-*mR  
  dlgAbout.DoModal(); "&Y`+0S8  
 } k>;`FFQU>  
 else HiZ*+T.B  
 { Q'=x|K#xj  
  CDialog::OnSysCommand(nID, lParam); *\ R ]NV  
 } X% t1 T4  
} IG2r#N|C#  
F3On?x)  
void CCaptureDlg::OnPaint() Te"ioU?.  
{ k\5c|Wq|g  
 if (IsIconic()) ~%&LTX0s|  
 { La`NPY_:>  
  CPaintDC dc(this); // device context for painting "~sW"n(F_  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); >*35C`^  
  // Center icon in client rectangle (A9Fhun  
  int cxIcon = GetSystemMetrics(SM_CXICON); 5?{ r  
  int cyIcon = GetSystemMetrics(SM_CYICON); +^60T$  
  CRect rect; TM%| '^)  
  GetClientRect(&rect); ]cHgleHQ  
  int x = (rect.Width() - cxIcon + 1) / 2; +r2+X:#~T  
  int y = (rect.Height() - cyIcon + 1) / 2; ]d$8f  
  // Draw the icon "@V Y  
  dc.DrawIcon(x, y, m_hIcon); j()7_  
 } (ZUHvvL  
 else oB(?_No7  
 { ,Vc6Gwm  
  CDialog::OnPaint(); wr$("A(  
 } oH97=>  
} ,wQ5.U,  
DhKS pA  
HCURSOR CCaptureDlg::OnQueryDragIcon() ;`0%t$@-  
{ C0T;![/4A  
 return (HCURSOR) m_hIcon; Sc]B#/~B  
} +}Dw3;W}m  
xQ7l~O b  
void CCaptureDlg::OnCancel() fDv2JdiU  
{ V5+=e^pa2  
 if(bTray) s}vAS~~2L3  
  DeleteIcon(); j'Fpjt"&=  
  CDialog::OnCancel(); <sb~ ^B  
} ZgTW.<.%2  
{'7B6  
void CCaptureDlg::OnAbout() - YEZ]:"  
{ ha]VWt%}  
 CAboutDlg dlg; }|h# \$w  
 dlg.DoModal(); Ua:}Vn&!  
} ^UP`%egR  
*7uH-u"5d  
void CCaptureDlg::OnBrowse() ZF!h<h&,  
{ 9 P l  
 CString str; Kn5~d(:  
 BROWSEINFO bi; NVkV7y X]  
 char name[MAX_PATH]; `KZm0d{H  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 5'OrHk;u  
 bi.hwndOwner=GetSafeHwnd(); 3#LlDC_WC  
 bi.pszDisplayName=name; %z=le7  
 bi.lpszTitle="Select folder"; /CrSu  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; uy>q7C  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); p*XANGA  
 if(idl==NULL) (p"%O  
  return; 4>wP7`/+y  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); R$R *'l  
 str.ReleaseBuffer(); !z\h| wU+  
 m_Path=str; \1k79c  
 if(str.GetAt(str.GetLength()-1)!='\\') Hus)c3Ty7  
  m_Path+="\\"; '{cIAw/"n  
 UpdateData(FALSE); S,88*F(<^q  
} tH!]Z4}u  
R)c?`:iUB  
void CCaptureDlg::SaveBmp() /2&c$9=1  
{ LQ@"Xe]5  
 CDC dc; ;YaQB#GK%  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 6fkRrD  
 CBitmap bm; 0CHH)Bku  
 int Width=GetSystemMetrics(SM_CXSCREEN); 5?f ^Rz  
 int Height=GetSystemMetrics(SM_CYSCREEN); ^ gdaa>L  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ) ;EBz  
 CDC tdc; tj'\tW+s'  
 tdc.CreateCompatibleDC(&dc);  on4HKeO  
 CBitmap*pOld=tdc.SelectObject(&bm); iDpSj!x/_  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); `aOFs+<)  
 tdc.SelectObject(pOld); * ` JYC  
 BITMAP btm; z0 d.J1VW  
 bm.GetBitmap(&btm); lov!o: dJ  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; &)QX7*H  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); xB@ T|EP  
 BITMAPINFOHEADER bih; bTI|F]^!  
 bih.biBitCount=btm.bmBitsPixel; ?e%ZOI  
 bih.biClrImportant=0; lt/1f{v[:  
 bih.biClrUsed=0; p'Y^ X  
 bih.biCompression=0; })'B<vq  
 bih.biHeight=btm.bmHeight; ,V7nzhA2  
 bih.biPlanes=1; 0 j^Kgx  
 bih.biSize=sizeof(BITMAPINFOHEADER); B`EJb71^Xy  
 bih.biSizeImage=size; Lc}LGq!  
 bih.biWidth=btm.bmWidth; T6'^EZZY  
 bih.biXPelsPerMeter=0; N:^n('U&j  
 bih.biYPelsPerMeter=0; kXViWOXU^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); EfqX y>W  
 static int filecount=0; N"Z{5A  
 CString name; pJ>P[  
 name.Format("pict%04d.bmp",filecount++); &j;wCvE4+  
 name=m_Path+name; ez7A4>/  
 BITMAPFILEHEADER bfh; R8K&R\  
 bfh.bfReserved1=bfh.bfReserved2=0; %:i7s-0w  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ;xy"\S]  
 bfh.bfSize=54+size; [|v][Hwv  
 bfh.bfOffBits=54; %7hrk  
 CFile bf; Kf3"Wf^q   
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ n3WlZ!$  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); aHD]k8 m z  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); pd?M f=>#  
  bf.WriteHuge(lpData,size); G0Iw-vf  
  bf.Close(); ldf\;Qk  
  nCount++; [DuttFX^x  
 } :'Vf g[Uq  
 GlobalFreePtr(lpData); )705V|v  
 if(nCount==1) TP*hd  
  m_Number.Format("%d picture captured.",nCount); vz&|J   
 else 7P } W *  
  m_Number.Format("%d pictures captured.",nCount); 9i:L&dN  
  UpdateData(FALSE); 5=-Q4d  
} yNPVOp*  
_O?`@g?i  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) e1yt9@k,  
{ `>o{P/HN  
 if(pMsg -> message == WM_KEYDOWN) ,KH#NY]  
 { =F|{# F  
  if(pMsg -> wParam == VK_ESCAPE) /'SNw?&  
   return TRUE; U4'#T%*  
  if(pMsg -> wParam == VK_RETURN) 6bg ;q(*7  
   return TRUE; . '6gZKXY  
 } 7g^]:3f!   
 return CDialog::PreTranslateMessage(pMsg); XPc^Tq  
} Lj({[H7D!  
: 6jbt:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .xCZ1|+gG  
{ x>K Or,f  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 4Z3su^XR  
  SaveBmp(); 6jaEv#  
  return FALSE; /|}EL%a  
} &C_j\7Dq  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ cVv=*81\  
 CMenu pop; `bq<$e  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); }RF(CwZr(  
 CMenu*pMenu=pop.GetSubMenu(0); g&L!1<, p  
 pMenu->SetDefaultItem(ID_EXITICON); 70?\ugxA  
 CPoint pt; Z-%\ <zT  
 GetCursorPos(&pt); ic:zsuEm  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); b`Zx!^  
 if(id==ID_EXITICON) M/f<A$xx_  
  DeleteIcon(); #~]zhHI  
 else if(id==ID_EXIT) 'ms-*c&  
  OnCancel(); { l/U6](  
 return FALSE; q1x`Bj   
} `7E;VL^Y1  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ZvM(Q=^  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) <_L,t 1H{  
 AddIcon(); qz_7%c]K[  
 return res; LBeF&sb6  
} 6q\bB  
w{8xpAqm  
void CCaptureDlg::AddIcon() j^sg6.Z*  
{ (XTG8W sN  
 NOTIFYICONDATA data; k=$TGqQY?  
 data.cbSize=sizeof(NOTIFYICONDATA); ;nfdGB  
 CString tip; bW427B0  
 tip.LoadString(IDS_ICONTIP); Wu/]MBM  
 data.hIcon=GetIcon(0); BKCiIfkZ  
 data.hWnd=GetSafeHwnd(); 5Pc;5 o0C  
 strcpy(data.szTip,tip); au(D66VO  
 data.uCallbackMessage=IDM_SHELL; r8?gD&c}  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ma]F7dZ5  
 data.uID=98; QT5TE: D  
 Shell_NotifyIcon(NIM_ADD,&data); UW={[h{.|@  
 ShowWindow(SW_HIDE); 0],r0  
 bTray=TRUE; NG=-NxEcN  
} :`#d:.@]o@  
QO:!p5^:  
void CCaptureDlg::DeleteIcon() /{J4:N'B>  
{ rBzuKQK}J  
 NOTIFYICONDATA data; rgQOj^xKv^  
 data.cbSize=sizeof(NOTIFYICONDATA); *8A  
 data.hWnd=GetSafeHwnd(); C3f' {}  
 data.uID=98; ! I:%0D  
 Shell_NotifyIcon(NIM_DELETE,&data); )AtD}HEv  
 ShowWindow(SW_SHOW); !?jrf] A@  
 SetForegroundWindow(); M] %?>G  
 ShowWindow(SW_SHOWNORMAL); _yx>TE2e  
 bTray=FALSE; VT)oLj/A  
} 3*XNV  
}"H,h)T  
void CCaptureDlg::OnChange() R%WCH?B<}  
{ r|8d 4  
 RegisterHotkey(); hh%-(HaLX3  
} B"w?;EeV.  
a5^] 20Fa  
BOOL CCaptureDlg::RegisterHotkey() sE<V5`Z=  
{ 79j+vH!zh  
 UpdateData(); $rBq"u=,0+  
 UCHAR mask=0; Pj^{|U21  
 UCHAR key=0; 05#1w#i  
 if(m_bControl) h2A <"w  
  mask|=4;  qA7>vi%  
 if(m_bAlt) NiEUW.0  
  mask|=2; RLXL&  
 if(m_bShift) ,-LwtePJ0  
  mask|=1; +o{R _  
  key=Key_Table[m_Key.GetCurSel()]; M/'sl;  
 if(bRegistered){ U}[d_f  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); NNR`!Pty  
  bRegistered=FALSE; qr^3R&z!}  
 } xt* 3'v  
 cMask=mask; nHAS(  
 cKey=key; {]!mrAjD  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); f}ji?p  
 return bRegistered; \)904W5R  
} ah&D%8E  
Sv#XIMw{,  
  四、小结 XEp{VC@=  
[!uG1GJ>  
  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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