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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: zu|=1C#5h  
  nV+]jQ~o  
  一、实现方法 RF.8zea{O`  
@;H1s4OZ  
  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: P :D6w){  
5nJmabw3  
#pragma data_seg("shareddata") XKT2u!Lx  
HHOOK hHook =NULL; //钩子句柄 tD !$!\`O  
UINT nHookCount =0; //挂接的程序数目 ]h0K*{  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 9='=wWW  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 jCv%[H7  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey qox31pnS  
static int KeyCount =0; %y}l^P5z  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 >6zXr.  
#pragma data_seg() a76`"(W  
Hze~oAP+  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ]R  s  
h> A}vI*:  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: c<j  +"  
[P?.( *  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Af_yb`W?  
cKey,UCHAR cMask) - d(RK_  
{ 7BDoF!kCx  
 BOOL bAdded=FALSE; */yR _f  
 for(int index=0;index<MAX_KEY;index++){ L;s,xV  
  if(hCallWnd[index]==0){ YXWlg%s  
   hCallWnd[index]=hWnd; J`4{O:{4  
   HotKey[index]=cKey; U:o(%dk  
   HotKeyMask[index]=cMask; L=."<,\  
   bAdded=TRUE; dY%>C75O  
   KeyCount++; >,. x'{  
   break; 4P\?vz"  
  } .8.LW4-ff  
 } x nm!$ $W  
 return bAdded; G.#sX  
} qC aM]Y  
//删除热键 SvD^'( x  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t)/:VImY  
{ c- {;P>L  
 BOOL bRemoved=FALSE; `;fk,\8t%  
 for(int index=0;index<MAX_KEY;index++){ =/jCDY  
  if(hCallWnd[index]==hWnd){ |&]04  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ my^2}>wi  
    hCallWnd[index]=NULL; C0@[4a$8f  
    HotKey[index]=0; B&oP0 jS  
    HotKeyMask[index]=0; d;9F2,k$w  
    bRemoved=TRUE;  E\! <=  
    KeyCount--; 96$qH{]Ap  
    break; #+,O  
   } RRH[$jk  
  } 9!06R-h  
 } ai,Nx:r   
 return bRemoved; nY[]k p@  
} XLNR%)l  
k^Q>  
4]$$ar)  
  DLL中的钩子函数如下: iCrLZ" $M  
Rg?m$$X`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~9KxvQzt  
{ 1-M\K^F  
 BOOL bProcessed=FALSE; dW8M^A&  
 if(HC_ACTION==nCode) PRE\ 2lLY  
 { (]l}QR%Bxu  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 {a `#O9  
   switch(wParam)  ,m-/R  
   {  D7"RZF\)  
    case VK_MENU: YzD6S*wb  
     MaskBits&=~ALTBIT; oTqv$IzqP  
     break; )KPQ8y!d  
    case VK_CONTROL: )D1=jD(  
     MaskBits&=~CTRLBIT; x.OCE`  
     break; t$W~X~//  
    case VK_SHIFT: R%Y#vUmBV{  
     MaskBits&=~SHIFTBIT; xYGB{g]  
     break; $ }D9)&f;  
    default: //judge the key and send message yxt `  
     break; ]7ZY|fP2  
   } c<gvUVHIxR  
   for(int index=0;index<MAX_KEY;index++){ _PR> <L_  
    if(hCallWnd[index]==NULL) e:&(y){n(  
     continue; C3p/|{TP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .%rB-vO:g  
    { \-?@ &' :  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); If*t$f>y4N  
     bProcessed=TRUE; LgX"Qk&Ca  
    } ^Q'^9M2)  
   } A=5A8B1  
  } *&VqAc%qD  
  else if((lParam&0xc000ffff)==1){ //有键按下 iEJY[P1  
   switch(wParam) (3>Z NTm  
   { OYsG#  
    case VK_MENU: v)a$;P%  
     MaskBits|=ALTBIT; },G>+ s8h  
     break; ;ESuj'*t  
    case VK_CONTROL: C=z7Gk=  
     MaskBits|=CTRLBIT; U%~L){<V[  
     break; [N-t6Z*  
    case VK_SHIFT: +%hA 6n  
     MaskBits|=SHIFTBIT; )K0BH q7r  
     break; (gn)<JJS}  
    default: //judge the key and send message fq"<=  
     break; ?xbPdG":R  
   } i9FHEu_  
   for(int index=0;index<MAX_KEY;index++){ 0WjPo  
    if(hCallWnd[index]==NULL) eaI!}#>R +  
     continue; P{-f./(JD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) FB-_a  
    { #l!Sz247  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); KF#,Q  
     bProcessed=TRUE; )fo9Qwe  
    } >,Zf3M  
   } V>`xTQG  
  } :i4>&4j  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 %0z&k!P  
   for(int index=0;index<MAX_KEY;index++){ SbLx`]rI  
    if(hCallWnd[index]==NULL) #$GDKK  
     continue; :$`"M#vMX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `]{/(pIgW;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !\0UEC  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 )aOPR|+  
   } HktvUJ(Ii  
  } Y!8Ik(/~i  
 } -2dk8]KB]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <3;Sq~^  
} ) DzbJ}  
Fj`6v"h  
  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: (>E 70|T  
=psX2?%L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Zljj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `nxm<~-\  
kAEm#oz=g  
  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: xt%-<%s%f  
4EO,9#0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) U2DE"  
{ YmS}*>oz  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) f ,?P1D\  
 { g?'4G$M  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 c:/ H}2/C  
  SaveBmp(); bk**% ]  
  return FALSE; =c-,uW11[  
 } 1?6;Oc^  
 …… //其它处理及默认处理 <3wfY #;><  
} i U^tv_1  
<4gT8 kQ$x  
.."=  
  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。 ;BsPms@U  
RN0@Q~oTI  
  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<*l+Qc  
BnLM;5 >  
  二、编程步骤 ? (&)p~o  
/5ngPHy&  
  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"; bN6FhKg|  
cI9}YSk  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ~v 2E<S3  
<mm. b  
  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; ^MyuD?va  
M>pcG.6V  
  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; !);kjXQS?  
]vJ] i <|b  
  5、 添加代码,编译运行程序。 J!$q"0G'WT  
Fu*~{n  
三、程序代码 ?F@0"qi  
X  8V^  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL t,*hxzD"  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) T9@W,0#  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ &TmN^R>  
#if _MSC_VER > 1000 #PzRhanX  
#pragma once Q0)6 2[cMm  
#endif // _MSC_VER > 1000 kvzGI>H:  
#ifndef __AFXWIN_H__ q1Ja*=r  
#error include 'stdafx.h' before including this file for PCH ?h;Zdv>`xz  
#endif ~bp^Q| wM  
#include "resource.h" // main symbols m"{D}(TA  
class CHookApp : public CWinApp CH6^;.  
{ _E[zYSo`  
 public: pNN6PsLt  
  CHookApp(); n5Ad@Bg  
  // Overrides U*.Wx0QM  
  // ClassWizard generated virtual function overrides c :S A#.  
  //{{AFX_VIRTUAL(CHookApp) Q3t9J"=1g  
 public: ZSKSMI%D  
  virtual BOOL InitInstance(); 0-ISOA&  
  virtual int ExitInstance(); 9V]\,mD=  
  //}}AFX_VIRTUAL y#'|=0vTvP  
  //{{AFX_MSG(CHookApp) V^a] @GK:  
  // NOTE - the ClassWizard will add and remove member functions here. J2 "n:  
  // DO NOT EDIT what you see in these blocks of generated code ! TG\3T%gH/s  
  //}}AFX_MSG H'fmQf  
  DECLARE_MESSAGE_MAP() a9CY,+ z5B  
}; XwKB+Yj0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); r sf +dC  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]V,wIy C  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Sga/i?!  
BOOL InitHotkey(); B 4pJg  
BOOL UnInit(); Voi`OCut  
#endif fdIO'L_  
ZGUhje!  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. G+^Q _w  
#include "stdafx.h" gpBpG  
#include "hook.h" EkV LSur  
#include <windowsx.h>  #K8kz  
#ifdef _DEBUG  aKkG[q N  
#define new DEBUG_NEW qVOlUH  
#undef THIS_FILE #{]X<et  
static char THIS_FILE[] = __FILE__; /8\gT(@  
#endif 1epj/bB&  
#define MAX_KEY 100 9?xMsu-H  
#define CTRLBIT 0x04 DYJ F6O  
#define ALTBIT 0x02 S&y(A0M  
#define SHIFTBIT 0x01 iw!kV  
#pragma data_seg("shareddata") A.a UWh  
HHOOK hHook =NULL; E2M|b  
UINT nHookCount =0; @Sxb}XI!f  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 86c@Kk7z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 8+ P)V4}  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey >z'kCv  
static int KeyCount =0; a?4'',~  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Nwu,:}T  
#pragma data_seg() }g1V6 `8&  
HINSTANCE hins; VKcO]_W1  
void VerifyWindow(); Mqu>#lL  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) q*,g  
//{{AFX_MSG_MAP(CHookApp) EV}c,*);y  
// NOTE - the ClassWizard will add and remove mapping macros here. K !&{k94  
// DO NOT EDIT what you see in these blocks of generated code! $Hr qX?&r  
//}}AFX_MSG_MAP Rf)lFi  
END_MESSAGE_MAP() *.X!AJ;M=O  
P4x Q:$2!  
CHookApp::CHookApp() Uq0GbLjv"  
{ qJ).;S{AAt  
 // TODO: add construction code here, r=Up-(j  
 // Place all significant initialization in InitInstance PNwXZ/N%  
} -e6~0%X  
N/ 7Q(^  
CHookApp theApp; E1(2wJ-3"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) KkVFY+/)  
{ ZJCD)?]=3  
 BOOL bProcessed=FALSE; ZP>KHiA  
 if(HC_ACTION==nCode) a}~Xns  
 { >syQDB  
  if((lParam&0xc0000000)==0xc0000000){// Key up HmWU;9Vn+  
   switch(wParam) h,-8( S  
   { s8,N9o[.~P  
    case VK_MENU: [42vO  
     MaskBits&=~ALTBIT; P`JO6O:&  
     break; ][ri A  
    case VK_CONTROL: %UEV['=  
     MaskBits&=~CTRLBIT; 's.%rre%  
     break; UZ8 vZ  
    case VK_SHIFT: 8!a6)Zeux  
     MaskBits&=~SHIFTBIT; pBW|d\8  
     break; .VFa,&5;3  
    default: //judge the key and send message 9>y6zFTV  
     break; {ZiZ$itf  
   } 9C?;'  
   for(int index=0;index<MAX_KEY;index++){ ZeVb< g  
    if(hCallWnd[index]==NULL) 6\MH2&L<  
     continue; a!Z.ZA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5,3Yt~\m  
    { T~shJ0%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ~&>|u5C*@  
     bProcessed=TRUE; Rj&V~or  
    } ]JQ';%dne  
   } 2hOr#I$/  
  } H5@N<v5 u  
  else if((lParam&0xc000ffff)==1){ //Key down (DzV3/+p^  
   switch(wParam) iOCx7j{BS  
   { *XRAM.  
    case VK_MENU: h,:8TMJRRN  
     MaskBits|=ALTBIT; "i+fO&LpZ  
     break;  nwH'E  
    case VK_CONTROL: 9$-V/7@)  
     MaskBits|=CTRLBIT; DOi\DJV!  
     break; @ lo6?9oNo  
    case VK_SHIFT: 4a'GWzUtS  
     MaskBits|=SHIFTBIT; W0vdU;?%  
     break; vWbf5?  
    default: //judge the key and send message ^a=,,6T  
     break; FX+;azE7  
   } ^rz8c+ly  
   for(int index=0;index<MAX_KEY;index++) f0S&_gt  
   { r^<W$-#  
    if(hCallWnd[index]==NULL) ?k$3( -  
     continue; PCxv_Svf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i qCZIahf  
    { <t9#~x#'b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %_*q'6K  
     bProcessed=TRUE; B^W0Ik`m  
    } yqdh LX|Mk  
   } |Gc2w]\3  
  } RS'%;B-)  
  if(!bProcessed){ sq6|J])GgU  
   for(int index=0;index<MAX_KEY;index++){ .Rq|F  
    if(hCallWnd[index]==NULL) /ESmQc:DWB  
     continue; yFp8 >  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Gy*6I)l  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); hhu !'(j  
   } Isa]5>  
  } *ujn+0)[  
 } -rYOx9P4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *,w9#?2x  
} tx=~bm"*?  
wO6`Ap t1:  
BOOL InitHotkey() #q`-"2"|  
{ 1:I47/  
 if(hHook!=NULL){ Z-(Vfp4  
  nHookCount++; l`s_Id#  
  return TRUE; 9Ra_[1  
 } y99 3uP   
 else 16q"A$  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 'Wv=mBEfZ  
  if(hHook!=NULL) Do3;-yp>`  
   nHookCount++; -\mbrbG9H  
  return (hHook!=NULL); 3c<). aC0f  
} Y|bCbaF  
BOOL UnInit() :-x F=Y(;  
{ S<Zb>9pl  
 if(nHookCount>1){ w!{g^*R+!  
  nHookCount--; v1 h*/#  
  return TRUE; K8 Y/sHl  
 } j(Tt-a("z  
 BOOL unhooked = UnhookWindowsHookEx(hHook); pVTx# rY  
 if(unhooked==TRUE){ ;\yVwur  
  nHookCount=0; $i@~$m7d-  
  hHook=NULL; s'yA^ VPf  
 } $xT'cl/IH  
 return unhooked; D]nVhOg|  
} ejYJOTT{^  
ADoxma@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w{$t:l)2,  
{ HbWl:yU  
 BOOL bAdded=FALSE; D{~mJDUzK  
 for(int index=0;index<MAX_KEY;index++){ T7eo_Mn  
  if(hCallWnd[index]==0){ B|#*I[4`w@  
   hCallWnd[index]=hWnd; Hd(|fc{2  
   HotKey[index]=cKey; MqXN,n+`k  
   HotKeyMask[index]=cMask; SooSOOAx[  
   bAdded=TRUE; Z/=x(I0  
   KeyCount++; m09 Bds  
   break; {b4+ Yc  
  } (dO, +~  
 } ,@2d <d]  
 return bAdded; >SA?lG8f%  
} E]PHO\f-m}  
't3/< h<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -P+( =U  
{ Yn ZV.&4{  
 BOOL bRemoved=FALSE; !@E=\Sm8EV  
 for(int index=0;index<MAX_KEY;index++){ RH+3x7 l  
  if(hCallWnd[index]==hWnd){ ?A7&SdJaO  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p;av63 i  
    hCallWnd[index]=NULL; `PI,tmv!  
    HotKey[index]=0; WZ}c)r*R  
    HotKeyMask[index]=0; "7_6iB&@<  
    bRemoved=TRUE; yE3g0@*  
    KeyCount--; mO$]f4}  
    break; &E.ckWf  
   } z@hlN3dg  
  } _iBNy   
 } i>gbT+*E!  
 return bRemoved; GJW>8*&&(  
} Hf P2o5-  
>U@7xeK  
void VerifyWindow() A@^e 4\  
{ /I~iUND"G  
 for(int i=0;i<MAX_KEY;i++){ 2[i:bksjW  
  if(hCallWnd!=NULL){ cPe0o'`[  
   if(!IsWindow(hCallWnd)){ =>".  
    hCallWnd=NULL; 8 /Z  
    HotKey=0; Nq>74q]}n8  
    HotKeyMask=0; Ct[{>asun  
    KeyCount--; ^S*~<0NQ'  
   } m_~!Lj[u.  
  } E )D*~2o/  
 } l ,0]iVJ  
} pv%UsbY  
e2|2$|  
BOOL CHookApp::InitInstance() f1F#U @U  
{ $5aRu,  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); \gferWm  
 hins=AfxGetInstanceHandle(); FJl#NOp&  
 InitHotkey(); !%n3_tZC  
 return CWinApp::InitInstance(); fw@n[u{~  
} '6*^s&H~  
H8j#rC#&pm  
int CHookApp::ExitInstance() !gv/jdF  
{ #)`N  
 VerifyWindow(); X $LX;Lv  
 UnInit(); o ohgZ&k2]  
 return CWinApp::ExitInstance(); <^+~? KDZM  
} H)S&sx#q]  
j!9p#JK#u  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ia !t~~f  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ]c,ttS _  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Afi;s. ,  
#if _MSC_VER > 1000 NDLk+n  
#pragma once E!;giPq*n  
#endif // _MSC_VER > 1000 Iy8>9m'5  
3B:U>F,]4  
class CCaptureDlg : public CDialog !P7&{I,e  
{ cOa.]Kk  
 // Construction o|lEF+  
 public: [eI{vH{  
  BOOL bTray; Y3G$(+i8  
  BOOL bRegistered; ]MJyBz+k  
  BOOL RegisterHotkey(); JgXP2|Y!  
  UCHAR cKey; KWIH5* AM  
  UCHAR cMask; n@[&SgZq  
  void DeleteIcon(); <oG+=h  
  void AddIcon(); q6'3-@%  
  UINT nCount; NqcmjHvy  
  void SaveBmp(); WT$m*I  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor i8A{DMc,U  
  // Dialog Data ZaQg SE>Y  
  //{{AFX_DATA(CCaptureDlg) :X-Z|Pv8  
  enum { IDD = IDD_CAPTURE_DIALOG }; VR/7CI4=  
  CComboBox m_Key; +grIw# j  
  BOOL m_bControl; FHWzwi*u}  
  BOOL m_bAlt; T4n.C~  
  BOOL m_bShift; !$r4 lu  
  CString m_Path; $PA=7`\MP/  
  CString m_Number; ~`M>&E@Y_/  
  //}}AFX_DATA (h>Jz  
  // ClassWizard generated virtual function overrides 37'@,*m`  
  //{{AFX_VIRTUAL(CCaptureDlg) 6#P\DT  
 public: jH26-b<  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ,Oojh;P_  
 protected: WoGK05w  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support p#HbN#^Hy  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); "/6<k0.D&  
  //}}AFX_VIRTUAL z,/0e@B >  
  // Implementation 9{bG @g  
 protected: 'vKB]/e;  
  HICON m_hIcon; w8E6)wF=7  
  // Generated message map functions e _\]Q-  
  //{{AFX_MSG(CCaptureDlg) &U\Xy+  
  virtual BOOL OnInitDialog(); Cw1Jl5OVZ  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); =/wAk0c^y  
  afx_msg void OnPaint(); i1RU5IRy|j  
  afx_msg HCURSOR OnQueryDragIcon(); tX)l$oRPr  
  virtual void OnCancel(); b6%T[B B  
  afx_msg void OnAbout(); sdP% Y<eAT  
  afx_msg void OnBrowse(); MkJ}dncg*  
  afx_msg void OnChange(); /MHqt=jP6  
 //}}AFX_MSG csZIBi  
 DECLARE_MESSAGE_MAP() j.O7-t%C  
};  hM   
#endif 5m2(7FC%su  
WK5~"aw  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file g7!P|  
#include "stdafx.h" 1{\{'EP{  
#include "Capture.h" V*P3C5 l  
#include "CaptureDlg.h" 7e$\|~<  
#include <windowsx.h> kGhWr M  
#pragma comment(lib,"hook.lib") t/z]KdK P  
#ifdef _DEBUG  qGG  
#define new DEBUG_NEW sIQd }  
#undef THIS_FILE hYRGIpu5  
static char THIS_FILE[] = __FILE__; 4?YhqJ  
#endif |eT?XT<=o  
#define IDM_SHELL WM_USER+1 q H&7Q{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); sXm8KV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -FA]%Pl<'  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; M,1Yce%+}  
class CAboutDlg : public CDialog ])paU8u  
{ Gw3eO&X3i  
 public: OoOKr  
  CAboutDlg(); #W`>vd}  
  // Dialog Data !Irmc*;QE  
  //{{AFX_DATA(CAboutDlg) 9hG)9X4  
  enum { IDD = IDD_ABOUTBOX }; jG=*\lK6  
  //}}AFX_DATA A[L+w9  
  // ClassWizard generated virtual function overrides pC,MiV$c"  
  //{{AFX_VIRTUAL(CAboutDlg) "-JJ6Bk  
 protected: mlCw(i,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5P_%Vp`B2  
  //}}AFX_VIRTUAL cF{5[?wS  
  // Implementation xzF@v>2S+  
 protected: t6p}LNm(V  
  //{{AFX_MSG(CAboutDlg) pQr `$:ga  
  //}}AFX_MSG xi=Z<G  
  DECLARE_MESSAGE_MAP() JzH\_,,  
}; -DDH)VO  
+f/G2qY!t  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) D&_Ir>"\  
{ !FOPFPn  
 //{{AFX_DATA_INIT(CAboutDlg) VQE8hQ37  
 //}}AFX_DATA_INIT z:f[<`,GT  
} tK)E*!  
*k'D%}N:  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) w6>'n }  
{ NikY0=i  
 CDialog::DoDataExchange(pDX); !f\,xa|M  
 //{{AFX_DATA_MAP(CAboutDlg) %Y8#I3jVJ  
 //}}AFX_DATA_MAP q,-bw2   
} pUby0)}t  
hKv3;jcd  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) UlQZw*ce  
 //{{AFX_MSG_MAP(CAboutDlg) ]$/TsN  
 // No message handlers vH_QSx;C#  
 //}}AFX_MSG_MAP nW2 fB8yq  
END_MESSAGE_MAP() [B3qZ"  
$7~ k#_#PC  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) D*3\4=6x  
: CDialog(CCaptureDlg::IDD, pParent) *44^M{ti<  
{ l]R O'  
 //{{AFX_DATA_INIT(CCaptureDlg) 01Bs7@"+  
  m_bControl = FALSE; q:N"mp<%  
  m_bAlt = FALSE; u )+;(Vd  
  m_bShift = FALSE; >-rDBk ;K  
  m_Path = _T("c:\\"); )M(;:#le  
  m_Number = _T("0 picture captured."); c;DWSgIw  
  nCount=0; A,-UW+:  
  bRegistered=FALSE; C;2!c  
  bTray=FALSE; O-- "\4  
 //}}AFX_DATA_INIT aW hhq@  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 s6SG%Vd  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); e$>.x< Eq  
} %lPAq  
b0PqP<{t  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) tcOgF:  
{ F VW&&ft  
 CDialog::DoDataExchange(pDX); Unev[!  
 //{{AFX_DATA_MAP(CCaptureDlg) kQ4-W9u  
  DDX_Control(pDX, IDC_KEY, m_Key); j|3p.Cy  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); TS+itU62  
  DDX_Check(pDX, IDC_ALT, m_bAlt); z7'3d7r?  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); y BF3Lms  
  DDX_Text(pDX, IDC_PATH, m_Path); K(RG:e~R0i  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ]~~PD?jh  
 //}}AFX_DATA_MAP UO^"<0u  
} &UH .e  
xe}d&  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) <+D(GH};  
//{{AFX_MSG_MAP(CCaptureDlg) pk2OZ,14Mj  
 ON_WM_SYSCOMMAND() E/x``,k  
 ON_WM_PAINT() V 9Bi2\s*  
 ON_WM_QUERYDRAGICON() _?Zg$7VJ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) >?s[g)np  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 4UD7!  
 ON_BN_CLICKED(ID_CHANGE, OnChange) >mRA|0$  
//}}AFX_MSG_MAP to~Ap=E  
END_MESSAGE_MAP() 6QVdnXoG/  
<a%9d<@m  
BOOL CCaptureDlg::OnInitDialog() v <1d3G=G  
{ bqpy@WiI S  
 CDialog::OnInitDialog(); x zmg'Br  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); eqD|3YX  
 ASSERT(IDM_ABOUTBOX < 0xF000); *(~7H6  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 9%aBW7@SK  
 if (pSysMenu != NULL) G3]TbU!!T  
 { zr%2oFeX,  
  CString strAboutMenu; 'Ba Ba=  
  strAboutMenu.LoadString(IDS_ABOUTBOX); $/</J]2`;  
  if (!strAboutMenu.IsEmpty()) FbB^$ ]*  
  { h-u63b1"?  
   pSysMenu->AppendMenu(MF_SEPARATOR);  m~"<k d  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); cLl=?^DB  
  } K#q1/2  
 } _jt>%v4}4  
 SetIcon(m_hIcon, TRUE); // Set big icon l<I.;FN^9@  
 SetIcon(m_hIcon, FALSE); // Set small icon urmx})=  
 m_Key.SetCurSel(0); /IS_-h7>XS  
 RegisterHotkey(); L+y}hb r  
 CMenu* pMenu=GetSystemMenu(FALSE); &P 'cf|KI  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); (VeX[*}I  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); b 'p0T1K(  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4PG]L`J{  
 return TRUE; // return TRUE unless you set the focus to a control xgV. <^  
} Z,AF^,H[  
X5i?B b.  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `l+{jrRb<  
{ @-y.Y}k#$~  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) UMsJg7~  
 { 5tUp[/]pl  
  CAboutDlg dlgAbout; h^ wu8E   
  dlgAbout.DoModal(); >jxo,xz  
 } |r2 U4 ^  
 else  ! K:  
 { {RFpTh7f:  
  CDialog::OnSysCommand(nID, lParam); %5<uQc9  
 } AA[(rw  
} gZbC[L  
apsR26\^  
void CCaptureDlg::OnPaint() I6?n>  
{ LbX>@2(&  
 if (IsIconic()) R7%' v Zk  
 { %Wy$m?gD  
  CPaintDC dc(this); // device context for painting Cx(|ZD^  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ,h1 z8.wD|  
  // Center icon in client rectangle feg  
  int cxIcon = GetSystemMetrics(SM_CXICON); !DgN@P.o  
  int cyIcon = GetSystemMetrics(SM_CYICON); o%dKi]  
  CRect rect; D"kss5>w  
  GetClientRect(&rect); v eP)ElX  
  int x = (rect.Width() - cxIcon + 1) / 2; 1#rcxUSi  
  int y = (rect.Height() - cyIcon + 1) / 2; .bcoH  
  // Draw the icon Y*0AS|r!  
  dc.DrawIcon(x, y, m_hIcon); +o+e*B7Eh  
 } NN(ZH73  
 else t5 :4'%|  
 { n.+%eYM<  
  CDialog::OnPaint(); 0X6|pC~  
 } v%gkQa  
} 9z>I&vcX  
:&*Y Io  
HCURSOR CCaptureDlg::OnQueryDragIcon() =[]V$<G'w{  
{ o@SL0H-6|  
 return (HCURSOR) m_hIcon; wuRB[KLe  
} -E, d)O`;$  
M\4pTcz{  
void CCaptureDlg::OnCancel() SMX70T!'9  
{ qPle=6U[IL  
 if(bTray) MR$R#  
  DeleteIcon(); G i 1Jl"  
  CDialog::OnCancel(); dw'&Av' |E  
} )S41N^j.  
7K"{}:  
void CCaptureDlg::OnAbout() )F_0('=t  
{ @ol}~&"  
 CAboutDlg dlg; kg0X2^#b  
 dlg.DoModal(); @)[Q6w`x  
} RsTz3]`yv  
9g %1^$R  
void CCaptureDlg::OnBrowse() 4^4<Le-G  
{ @E Srj[  
 CString str; / =]h@m-`  
 BROWSEINFO bi; 3$<u3Zi6  
 char name[MAX_PATH];  UZJ^ e$N  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); L'1!vu *Rg  
 bi.hwndOwner=GetSafeHwnd(); s2SxMFDP  
 bi.pszDisplayName=name; q [}<LU  
 bi.lpszTitle="Select folder"; u@ MUcW  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; b$7p`Ay  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); eBUexxBY  
 if(idl==NULL) )\nKr;4MH  
  return; ['~E _z  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >9-$E?Mt  
 str.ReleaseBuffer(); l(&3s:Ud  
 m_Path=str; XPJsnu  
 if(str.GetAt(str.GetLength()-1)!='\\') V { #8+  
  m_Path+="\\"; G;RFY!o  
 UpdateData(FALSE); HpbSf1VvAf  
} 2bu,_<K.  
l', +l{\Z  
void CCaptureDlg::SaveBmp() <V[Qs3uo(  
{ 1Ce7\A  
 CDC dc; Z5x&P_.x[  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); RCZ"BxleU  
 CBitmap bm; HL8onNq  
 int Width=GetSystemMetrics(SM_CXSCREEN); QMO.Bnek  
 int Height=GetSystemMetrics(SM_CYSCREEN); =&%}p[ 3g  
 bm.CreateCompatibleBitmap(&dc,Width,Height); )P13AfK  
 CDC tdc; j p"hbV  
 tdc.CreateCompatibleDC(&dc); \kN?7b^  
 CBitmap*pOld=tdc.SelectObject(&bm); d_7v1)j  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); "2l$}G  
 tdc.SelectObject(pOld); rdQKzJiX=U  
 BITMAP btm; 7+(on  
 bm.GetBitmap(&btm); `kE ;V!n?  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; RA];hQI?  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); DxM$4  
 BITMAPINFOHEADER bih; KM-d8^\:  
 bih.biBitCount=btm.bmBitsPixel; 1>~bzXY#  
 bih.biClrImportant=0; 0H9UM*O  
 bih.biClrUsed=0; G4&vrM,f  
 bih.biCompression=0; pL [JGn  
 bih.biHeight=btm.bmHeight; \&!qw[;O  
 bih.biPlanes=1; k-V3l  
 bih.biSize=sizeof(BITMAPINFOHEADER); &\Ze<u  
 bih.biSizeImage=size; ]Rk4"i  
 bih.biWidth=btm.bmWidth; ` x|=vu-  
 bih.biXPelsPerMeter=0; .}n-N #  
 bih.biYPelsPerMeter=0; 19h@fA[:  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); #gq!L  
 static int filecount=0;  a,ff8Qm  
 CString name; Lg%3M8-W~  
 name.Format("pict%04d.bmp",filecount++); nrEG4X9  
 name=m_Path+name; e=ITAH3b  
 BITMAPFILEHEADER bfh; gZf8/Tp\z  
 bfh.bfReserved1=bfh.bfReserved2=0; s(.H"_ a  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ID_#a9N  
 bfh.bfSize=54+size; 4UxxmREx;  
 bfh.bfOffBits=54; W(#u^,$e[  
 CFile bf; c1Rn1M,2k  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ^-^ii 3G`  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 634OH*6  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); R:+cumHr  
  bf.WriteHuge(lpData,size); Be$v%4  
  bf.Close(); rv?4S`Z,x$  
  nCount++; 3< 'bi}{  
 } 1m~-q4D)V  
 GlobalFreePtr(lpData); `=Z3X(Kc  
 if(nCount==1) BjSd\Ul  
  m_Number.Format("%d picture captured.",nCount); {D$5M/$  
 else /:Q  
  m_Number.Format("%d pictures captured.",nCount); ;:PxWm|_  
  UpdateData(FALSE); Of}dsav   
} mu*RXLai  
ljP<WD  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) B?nw([4m  
{ (=-6'23q)  
 if(pMsg -> message == WM_KEYDOWN) Q "vhl2RX  
 { I/B*iW^  
  if(pMsg -> wParam == VK_ESCAPE) _ ?o>i/  
   return TRUE; 0$g;O5y"i  
  if(pMsg -> wParam == VK_RETURN) 4JO[yN  
   return TRUE; *|4/XHi  
 } g\2/Ia+/@  
 return CDialog::PreTranslateMessage(pMsg); p![UOI"W  
} |[_%zV;p>v  
#E$*PAB  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %,UTFuM`  
{ /lS5B6NU  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ }'p"q )  
  SaveBmp(); %dwI;%0  
  return FALSE; *'cyFu$  
} jwL\|B oE  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ fW w+'xF!  
 CMenu pop; l`<1Y|  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;#?G2AAv  
 CMenu*pMenu=pop.GetSubMenu(0); hiKyU! )Hv  
 pMenu->SetDefaultItem(ID_EXITICON); 207FD  
 CPoint pt; fZiwuq !_  
 GetCursorPos(&pt); wnU-5r&!]  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this);  JfsvK2I  
 if(id==ID_EXITICON) ]iY O}JuX  
  DeleteIcon(); ]!X[[w)  
 else if(id==ID_EXIT) Sby(?yg  
  OnCancel(); dKQu  
 return FALSE; AM0CIRX$  
} 6_L<&RmLg  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ^WkqRs  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) nB;[;dC z  
 AddIcon(); &+]-e;[  
 return res; / # d^  
} 9$#@Oe8*  
P''>wjMH0  
void CCaptureDlg::AddIcon() ,m Nd#  
{ d{Cg3v`Rd  
 NOTIFYICONDATA data; M%YxhuT0  
 data.cbSize=sizeof(NOTIFYICONDATA); !l-Q.=yw  
 CString tip; YB1Jv[  
 tip.LoadString(IDS_ICONTIP); 4:= VHd  
 data.hIcon=GetIcon(0); m}(M{^\|  
 data.hWnd=GetSafeHwnd(); Dk Ef;P  
 strcpy(data.szTip,tip); qjsEyro$-  
 data.uCallbackMessage=IDM_SHELL; " ?Ux\)*  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; y(wb?86#W5  
 data.uID=98; xpJ=yxO  
 Shell_NotifyIcon(NIM_ADD,&data); m al?3*x/  
 ShowWindow(SW_HIDE); H]}mg='kI  
 bTray=TRUE; '=`af>Nc  
} TkR#Kzv380  
cGyR_8:2cv  
void CCaptureDlg::DeleteIcon() Nwo*tb:  
{ +|--}iE5n  
 NOTIFYICONDATA data; X%$1%)C9  
 data.cbSize=sizeof(NOTIFYICONDATA); Zb7%$1)L~  
 data.hWnd=GetSafeHwnd(); p}Um+I=1  
 data.uID=98; B7wzF"  
 Shell_NotifyIcon(NIM_DELETE,&data); Qv<p$Up6  
 ShowWindow(SW_SHOW); `MHixQ;j  
 SetForegroundWindow(); Q@uWh:  
 ShowWindow(SW_SHOWNORMAL); Ob/i_  
 bTray=FALSE; R7 rO7M !  
} :PK2! 0nK  
"A*;V  
void CCaptureDlg::OnChange() {"2Hv;x  
{ Mh2Zj  
 RegisterHotkey(); TBIr^n>Z<k  
} r~G  amjS  
>`l^ C  
BOOL CCaptureDlg::RegisterHotkey() ;H3~r^>c  
{ yIC C8M  
 UpdateData(); * a^wYWa  
 UCHAR mask=0; <iBn-EG l>  
 UCHAR key=0; `oTV)J'~  
 if(m_bControl) CTe!jMZ=  
  mask|=4; ;Y,zlq2  
 if(m_bAlt) e8E'X  
  mask|=2; XmaRg{22  
 if(m_bShift) S5:&_&R8[  
  mask|=1; 8>9MeDE  
  key=Key_Table[m_Key.GetCurSel()]; $DaQM'-  
 if(bRegistered){ :r2d%:h%2  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); }KYOde@  
  bRegistered=FALSE; voFg6zoV_  
 } kxR!hA8wv4  
 cMask=mask; v cUGBGX_&  
 cKey=key; = c1>ja  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); +,g!xv4Q  
 return bRegistered; 4M!wm]n/%5  
} uz I-1@`  
XgyLlp;,O  
  四、小结 4:Oq(e_(  
OrF.wcg  
  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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