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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: Mi F( &#  
  w7vQ6jkH  
  一、实现方法 A.r.tf}:  
m2ph8KC  
  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: j)juvat  
57;( P  
#pragma data_seg("shareddata") ]5MT-qU  
HHOOK hHook =NULL; //钩子句柄 u9]M3>  
UINT nHookCount =0; //挂接的程序数目 %+UTs'I  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 I7t}$ S6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Lw?>1rTT/  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey V|{~9^  
static int KeyCount =0; gI@nE:(m  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 &b2@+/ F  
#pragma data_seg() .v9i|E=<~  
 BrZ17  
  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。 Q^?$2ck=  
{?X +Yw  
  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:  ;CV'  
RtDTcaW/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR g|4>S<uC  
cKey,UCHAR cMask) ^?0?*  
{ %(s2{$3  
 BOOL bAdded=FALSE; ma"M?aM  
 for(int index=0;index<MAX_KEY;index++){ A v;NQt8ut  
  if(hCallWnd[index]==0){ 1 7 iw`@  
   hCallWnd[index]=hWnd; Y'R/|:YL@  
   HotKey[index]=cKey; +j$nbU0U  
   HotKeyMask[index]=cMask; k9VWyq__  
   bAdded=TRUE; 2&AX_#P  
   KeyCount++; P;|63" U  
   break; V=Bmpg  
  } {`Mb),G  
 } )]m4FC:  
 return bAdded; Uf?+oc'{  
} sp0_f;bC  
//删除热键 ?;w\CS^Qu  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) UCo<ie\V  
{ b8$%=Xp  
 BOOL bRemoved=FALSE; K;TTGK  
 for(int index=0;index<MAX_KEY;index++){ (@O,U  
  if(hCallWnd[index]==hWnd){ >}u#KBedE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ x'%vL",%  
    hCallWnd[index]=NULL;  8*uaI7;*  
    HotKey[index]=0; !&v"+ K3lU  
    HotKeyMask[index]=0; 9R&.$5[W(s  
    bRemoved=TRUE; B\;fC's+  
    KeyCount--; eV0eMDY5  
    break; ?tT89m3_E  
   }  FE1En  
  } 8|\xU9VT  
 } jo0XOs  
 return bRemoved; i/C0 (!  
} -}8r1jQH;  
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G2:.8 ok  
  DLL中的钩子函数如下: vQDR;T"]  
c5[ ~2e  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) R F;u1vEQ8  
{ Y&i&H=U  
 BOOL bProcessed=FALSE; ~4ijiw$  
 if(HC_ACTION==nCode) >R\@W(-g`  
 { Nvd(Tad  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 .Lm`v0' w  
   switch(wParam) T+!0`~`  
   {  Z_T~2t  
    case VK_MENU: ^vOEG;TR<-  
     MaskBits&=~ALTBIT; 5?E;Yy A  
     break; +bWo{   
    case VK_CONTROL: b}hQU~,E  
     MaskBits&=~CTRLBIT; 2D3mTpw  
     break; UK[+I]I p  
    case VK_SHIFT: iciRlx.$c  
     MaskBits&=~SHIFTBIT; t*c_70|@k  
     break; HLE%f;  
    default: //judge the key and send message gM6o~ E  
     break; #vPk XcP  
   } grJ(z)c  
   for(int index=0;index<MAX_KEY;index++){ w&&)v~Y_  
    if(hCallWnd[index]==NULL) Ti#x62X{  
     continue; m x2Ov u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Maiyd  
    { a]I~.$G   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); s-l3_210  
     bProcessed=TRUE; C"h7'+Kw  
    } [-#q'S  
   } n+Ng7  
  } OoZv\"}!_  
  else if((lParam&0xc000ffff)==1){ //有键按下 g_"B:DR  
   switch(wParam) J^pq<   
   { F}5skD=  
    case VK_MENU: Vz y )jf  
     MaskBits|=ALTBIT; 3tmS/ tQp  
     break; Uz `OAb  
    case VK_CONTROL: +# @2,  
     MaskBits|=CTRLBIT; 48 mTL+*  
     break; ZYz8ul$E  
    case VK_SHIFT: miY=xwK&  
     MaskBits|=SHIFTBIT; ED A6b]  
     break;  b|Eo\l2  
    default: //judge the key and send message .5#+)] l  
     break; GGGz7_s ?  
   } . B6mvb\  
   for(int index=0;index<MAX_KEY;index++){ 2y9$ k\<xV  
    if(hCallWnd[index]==NULL) 3C#Sr6  
     continue; e&9v`8}   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Js9 EsN%  
    { 2W)KfS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); h<BTu7a`r  
     bProcessed=TRUE; -TyBb]  
    } hWr}Uui  
   } m;u:_4  
  } BR~+CBH  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 asYUb&Hz88  
   for(int index=0;index<MAX_KEY;index++){ _^F%$K6  
    if(hCallWnd[index]==NULL) ^ pocbmg  
     continue; (abtCuZ8z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?"p.Gy)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8oJp_sw  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 biH ZyUJ  
   } {XLRrU!*  
  } : )k|Onz  
 } rX|{nb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Ys@\~?ym+  
} FOuPj+}F  
B)&z% +  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: |eej}G(,m}  
sTi3x)#xB  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |b|bL 7nx  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U+@rLQ.-  
?a~#`<  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: +3-f$/po  
FF30 VlJ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /I0}(;^y  
{ U{3Pk0rZ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ->@iw!5xu  
 { fvoPV &:  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 WAGU|t#."  
  SaveBmp(); snny! 0E\m  
  return FALSE; W0# VDe]>  
 } R^6^ {q  
 …… //其它处理及默认处理  `=I@W  
} ],f%: ?%50  
!f# [4Xw  
b*cVC^{Dy  
  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。 *Di ;Gf@  
B|- W  
  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。 8?t}S2n2  
%r:Uff@  
  二、编程步骤 }<H0CcG  
DA/ \[w?J  
  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"; Bvz& p)(  
ZJ |&t  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; <{k8 K6  
Xm^/t#  
  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; oBWa\N  
WNiM&iU  
  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@;E  
OH vV_  
  5、 添加代码,编译运行程序。 `xFgYyiQd  
m2to94yh  
三、程序代码 gg :{Xf*`  
PKt;]T0  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL +HY.m+T  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 8Y~\:3&1<  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ~G8haN4  
#if _MSC_VER > 1000 *En4~;l  
#pragma once I<$m%  
#endif // _MSC_VER > 1000 O[HBw~  
#ifndef __AFXWIN_H__ 7u[$  
#error include 'stdafx.h' before including this file for PCH 7^Y`'~Y^  
#endif ?xzDz  
#include "resource.h" // main symbols NE-c[|rq  
class CHookApp : public CWinApp r?=3TAA  
{ nbU?:=P  
 public: >2LlBLQ  
  CHookApp(); 4Kn)5>  
  // Overrides :&$ WWv  
  // ClassWizard generated virtual function overrides wRQMuFGY  
  //{{AFX_VIRTUAL(CHookApp) VJ|8 0?4h  
 public: M7\KiQd  
  virtual BOOL InitInstance(); a |0f B4G  
  virtual int ExitInstance(); \.{ZgL5"  
  //}}AFX_VIRTUAL b@)nB  
  //{{AFX_MSG(CHookApp) #e$vv!&}  
  // NOTE - the ClassWizard will add and remove member functions here. *uvE`4V^Jg  
  // DO NOT EDIT what you see in these blocks of generated code ! )F%zT[Auph  
  //}}AFX_MSG !+ ??3-q  
  DECLARE_MESSAGE_MAP() vN`JP`IBx  
}; $ Q*^c"&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); +ZPn[|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?YhGW   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hbTJXP~~?  
BOOL InitHotkey(); fBct%M 3  
BOOL UnInit(); Y j*Y*LB~  
#endif v^(J+d_>   
)W3kBDD  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. "l 1z@  
#include "stdafx.h" C 4hvk'=  
#include "hook.h" 8POLp9>X  
#include <windowsx.h> lxOUV?m^N  
#ifdef _DEBUG F;)qM|7  
#define new DEBUG_NEW p(x<h  
#undef THIS_FILE 3Cl&1K #5  
static char THIS_FILE[] = __FILE__; _qq>-{-Ym  
#endif L ^{C4}x=  
#define MAX_KEY 100 ,M$ J yda  
#define CTRLBIT 0x04 5*r5?ne  
#define ALTBIT 0x02 h>&t``<  
#define SHIFTBIT 0x01 %jj\w>  
#pragma data_seg("shareddata") H.[t&VO  
HHOOK hHook =NULL; /7yd&6`I  
UINT nHookCount =0; hO4* X  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 7N[Cs$_]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT u#v];6N  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey <=PYu:]h  
static int KeyCount =0; z#{%[X2  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift K{]\}7+   
#pragma data_seg() $D(q  
HINSTANCE hins; 2"L a}Vx2  
void VerifyWindow(); >7nOR  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) >Ms_bfSK  
//{{AFX_MSG_MAP(CHookApp) @7OE:& #V  
// NOTE - the ClassWizard will add and remove mapping macros here. 3Vb/Mn!k  
// DO NOT EDIT what you see in these blocks of generated code! $C9['GGR  
//}}AFX_MSG_MAP D 13bQ&\B-  
END_MESSAGE_MAP() -Oc  
NUGiDJ+[  
CHookApp::CHookApp() &3bhK5P  
{ IyGW>g6_.  
 // TODO: add construction code here, YfU6 mQ  
 // Place all significant initialization in InitInstance "!_,N@\t  
} rd4mAX6@  
P(Q}r 7F~(  
CHookApp theApp; 3"iJ/Hc}9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) o.KE=zp&z  
{ m[6c{$A/w  
 BOOL bProcessed=FALSE; zr[|~-  
 if(HC_ACTION==nCode) DO9_o9'  
 { 4W36VtQ@E  
  if((lParam&0xc0000000)==0xc0000000){// Key up I"r[4>>B>0  
   switch(wParam) *aS[^iX?s  
   { 5Z(#)sa0Og  
    case VK_MENU: L QA6iZBP  
     MaskBits&=~ALTBIT; $5Tjo T  
     break; [HSN*LXe  
    case VK_CONTROL: OK=ANQjs(  
     MaskBits&=~CTRLBIT; 2+qU9[kd|  
     break; ETtoY<`#  
    case VK_SHIFT: m15> ^i^W  
     MaskBits&=~SHIFTBIT; wGAeOD  
     break; udGZ%Mr_  
    default: //judge the key and send message qq[Enf|/y  
     break; Ai.^~#%X  
   } Bz*6M  
   for(int index=0;index<MAX_KEY;index++){ TWT h!  
    if(hCallWnd[index]==NULL) P_%kYcX'  
     continue; rZ^VKO`~I1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5{O9<~,  
    { %Y<3v \`_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "BD$-]  
     bProcessed=TRUE; lehuJgz'OO  
    } ^?o>(K  
   } 5!}fd/}Uk  
  } ,S\AUUt%  
  else if((lParam&0xc000ffff)==1){ //Key down PBp+(o-  
   switch(wParam) _cD-E.E%  
   { #i}:CI>2  
    case VK_MENU: :ej`]yK |  
     MaskBits|=ALTBIT; e[*%tx H  
     break; p )w{}@%r  
    case VK_CONTROL: /faP@Q3kR  
     MaskBits|=CTRLBIT; y`p(}X`>  
     break; &U0Y#11Cx  
    case VK_SHIFT: >J_%'%%f  
     MaskBits|=SHIFTBIT; Gjo&~*;  
     break; nj5Hls  
    default: //judge the key and send message ,NoWAmv  
     break; iE=:}"pI"  
   } NM&R\GI  
   for(int index=0;index<MAX_KEY;index++) &xMQ  
   {  o C#W  
    if(hCallWnd[index]==NULL) W#lt_2!j  
     continue; fW8whN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <-Q0s%mNj,  
    { [gxH,=Pb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); PHQ99&F1  
     bProcessed=TRUE; pm k;5 d  
    } 37nGFH`K2m  
   } G=qT{c 8Q  
  } OysO55i  
  if(!bProcessed){ |g8Q.*"l[  
   for(int index=0;index<MAX_KEY;index++){ f`"@7-N  
    if(hCallWnd[index]==NULL) p-,(P+Np  
     continue; 8$y5) ~Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) i $;y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 7=[/J*-m  
   } R?H[{A X  
  } =>,X)+O  
 }  NncII5z  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &)#bdt[  
} k9 NPC"  
g RBbL1  
BOOL InitHotkey() Tl`HFZQ1  
{ f4r)g2Zb[  
 if(hHook!=NULL){ mZ}C)&,m2  
  nHookCount++; [V_\SQV0  
  return TRUE; +DA ,|~k_  
 } pQ yH`  
 else R1NwtnS  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Q9NKQuSu  
  if(hHook!=NULL) -VhxnhS  
   nHookCount++; Y<9]7R(\;  
  return (hHook!=NULL); QPJz~;V2  
} cSWn4-B@l  
BOOL UnInit() LP:F'Q:<  
{ l F*x\AT  
 if(nHookCount>1){ D!nx%%q  
  nHookCount--; JWo).  
  return TRUE; Kuy0Ci  
 } P* .0kR1n  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Y[Kpd[)[v  
 if(unhooked==TRUE){ 8$C?j\J|*  
  nHookCount=0; Y!w {,\3  
  hHook=NULL; Tg\wBhJr|  
 } %:/?eZ  
 return unhooked; 1@{qPmf^  
} ewORb  
4+'d">+|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u:GDM   
{ 6R+EG{`  
 BOOL bAdded=FALSE; wTkcR^  
 for(int index=0;index<MAX_KEY;index++){ HA0Rv#p  
  if(hCallWnd[index]==0){ *zTEK:+_  
   hCallWnd[index]=hWnd; SWPb=[WEz  
   HotKey[index]=cKey; VAet!H+]  
   HotKeyMask[index]=cMask; R"V^%z;8o  
   bAdded=TRUE; '5 kSr(  
   KeyCount++; }Z3+z@L  
   break; Z"Byv.yqb  
  } \:|"qk  
 } @w{"6xc%a  
 return bAdded; o0\d`0-el  
} 2V)qnMxAZJ  
 j2%?-(U  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Os"T,`F2s  
{ !@wG22iC4d  
 BOOL bRemoved=FALSE; 8lfKlXR78  
 for(int index=0;index<MAX_KEY;index++){ 2(iv+<t  
  if(hCallWnd[index]==hWnd){ u RPvo}!=1  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ K6M_b?XekA  
    hCallWnd[index]=NULL; a<d$P*I(cH  
    HotKey[index]=0; u[~= a 5:4  
    HotKeyMask[index]=0; jpRC6b?  
    bRemoved=TRUE; 6qH^&O][  
    KeyCount--; d gRTV<vM  
    break; o=ULo &9  
   } P[<EFj E  
  } &&K"3"um  
 } SvN2}]Kh  
 return bRemoved; gq[`g=x  
} _yP02a^2  
sTChbks  
void VerifyWindow() +#MQ8d  
{ fZF.eRP '  
 for(int i=0;i<MAX_KEY;i++){ Kb,#Ot  
  if(hCallWnd!=NULL){ G0&'B6I>  
   if(!IsWindow(hCallWnd)){ Zq\Vq:MX  
    hCallWnd=NULL; Q3|I.I e  
    HotKey=0; lJ/{.uK  
    HotKeyMask=0; h(MS>=  
    KeyCount--; v7@O ,%  
   } @1^:V-=  
  } E!zAUEVQm[  
 } T,SCK^  
} }j6<S-s~  
gi5Ffvs$  
BOOL CHookApp::InitInstance() ?Y | *EH  
{ C:$pAE(  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); TB(!*t  
 hins=AfxGetInstanceHandle(); kRH;c,E@  
 InitHotkey(); |dI,4Z\Qb  
 return CWinApp::InitInstance(); #,PB(  
} 9i*Xd$ G  
i8H!4l  
int CHookApp::ExitInstance() k*Vf2O3${  
{ "'\f?A9  
 VerifyWindow(); XX|wle1Kg  
 UnInit(); F-I\x  
 return CWinApp::ExitInstance(); vg ^&j0  
} y&{ Z"+B5  
d0CFMy6  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file }&:F,q*  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) n9N '}z  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Y:'#jY*V  
#if _MSC_VER > 1000 JBxizJBP  
#pragma once h(Ccm44  
#endif // _MSC_VER > 1000 v'X=|$75  
T^XU5qgN  
class CCaptureDlg : public CDialog Qb~&a1&s#  
{ Kt/Wd  
 // Construction ^":Dk5gl  
 public: +KKx\m*  
  BOOL bTray; H]d'#1G  
  BOOL bRegistered; M +Jcg b]  
  BOOL RegisterHotkey(); 9 &p;2/H  
  UCHAR cKey; *&sXC@^@^  
  UCHAR cMask; T_1p1Sg  
  void DeleteIcon(); gg}^@h&?  
  void AddIcon(); Z5%TpAu[  
  UINT nCount; r(uf yC&  
  void SaveBmp(); e lzKtVw  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 2-!n+#Cdf  
  // Dialog Data 2B=''W  
  //{{AFX_DATA(CCaptureDlg) |y~un9j +  
  enum { IDD = IDD_CAPTURE_DIALOG }; qs'ggF1  
  CComboBox m_Key; b"QeCw#v`>  
  BOOL m_bControl; ]53'\TH  
  BOOL m_bAlt; ajMI7j^G  
  BOOL m_bShift; PquATAzQA  
  CString m_Path; @E5 }v  
  CString m_Number; KXTx{R  
  //}}AFX_DATA h<ULp &g  
  // ClassWizard generated virtual function overrides WA&&*ae5`  
  //{{AFX_VIRTUAL(CCaptureDlg) \NI0rL  
 public: 8`S6BkfC|  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 'I *&P5|  
 protected: p&4#9I5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support P2^((c  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); *N|s+  
  //}}AFX_VIRTUAL ZUxlk+o9d  
  // Implementation !ii'hwFm$  
 protected: oHI/tS4 _  
  HICON m_hIcon; ]p sx\ZMa  
  // Generated message map functions e:H9!  
  //{{AFX_MSG(CCaptureDlg) SuU %x2  
  virtual BOOL OnInitDialog(); b$Ch2Qz0q  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 6a\YD{D] _  
  afx_msg void OnPaint(); dx It.h   
  afx_msg HCURSOR OnQueryDragIcon(); `GD>3-   
  virtual void OnCancel(); _$Hx:^p:  
  afx_msg void OnAbout(); KB^i=+xr  
  afx_msg void OnBrowse(); |#D$9+  
  afx_msg void OnChange(); fW'U7&O  
 //}}AFX_MSG 999E0A$dkv  
 DECLARE_MESSAGE_MAP() M$Of.  
}; )-4xI4  
#endif ;4rTm@6  
!j|93*  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file _Z|3qQ  
#include "stdafx.h" rJ UXA<:2  
#include "Capture.h" ]A2l%V_7  
#include "CaptureDlg.h" V*U*_Y  
#include <windowsx.h> :*wjC.Z  
#pragma comment(lib,"hook.lib") _hb@O2f  
#ifdef _DEBUG ;uazQyo6  
#define new DEBUG_NEW t%f6P  
#undef THIS_FILE wWNHZ v&  
static char THIS_FILE[] = __FILE__; U'tfsf/V  
#endif 0 w#[?.  
#define IDM_SHELL WM_USER+1 30Z RKrW"~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8Qg,UX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )|@ H#kv?  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [# '38  
class CAboutDlg : public CDialog 0u'qu2mV  
{ B "z`X!\  
 public: T]fu[yRVvg  
  CAboutDlg(); Cp@' k;(  
  // Dialog Data ?]# U~M<'  
  //{{AFX_DATA(CAboutDlg) Aj;F$(su  
  enum { IDD = IDD_ABOUTBOX }; %4Thb\T  
  //}}AFX_DATA bqt*d)$  
  // ClassWizard generated virtual function overrides tsA+B&R_]  
  //{{AFX_VIRTUAL(CAboutDlg) VYZkHjj)2i  
 protected: :z!N_]t  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4,|A\dXE  
  //}}AFX_VIRTUAL Evn=3Tw  
  // Implementation :uD*Q/  
 protected: #*<*|AwoW|  
  //{{AFX_MSG(CAboutDlg) AGN5=K*D  
  //}}AFX_MSG d:"]*EZ [  
  DECLARE_MESSAGE_MAP() NZyGC Vh@  
}; }(r%'(.6  
DP D%8a)?  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 07_ym\N  
{ 6DFF:wrm&  
 //{{AFX_DATA_INIT(CAboutDlg) %;E/{gO  
 //}}AFX_DATA_INIT TFWx(}1  
} p(F}[bP  
lo*)% fy  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) <?UIux  
{ KnC;j-j  
 CDialog::DoDataExchange(pDX); /@<Pn&Rq  
 //{{AFX_DATA_MAP(CAboutDlg) z3  lZ3  
 //}}AFX_DATA_MAP L]goHs  
} Qw ukhD7  
\V#2K><  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) |nN{XjNfP5  
 //{{AFX_MSG_MAP(CAboutDlg) rR4_=S<Mi:  
 // No message handlers y0d a8sd)  
 //}}AFX_MSG_MAP E2s lpo  
END_MESSAGE_MAP() D9;2w7v  
DJ)z~W2I*  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) R N1q/H|  
: CDialog(CCaptureDlg::IDD, pParent) Bw31h3yB  
{ cVt MCgx  
 //{{AFX_DATA_INIT(CCaptureDlg) ]Fc<% wzp  
  m_bControl = FALSE; G 1 rsd  
  m_bAlt = FALSE; N;9m&)@JR'  
  m_bShift = FALSE; #-_';Er\  
  m_Path = _T("c:\\"); U9[ &ci  
  m_Number = _T("0 picture captured."); ' {L5 3cH=  
  nCount=0; S`Jo^!VJ4  
  bRegistered=FALSE; 4E`y*Hmzy+  
  bTray=FALSE; TU-4+o%;  
 //}}AFX_DATA_INIT I]"wT2@T;7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 s:y~vd(Vi  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); QQso<.d&  
} v>FsP$p4yE  
Zxm Mw  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) [4NJ]r M%  
{ FYI*44E  
 CDialog::DoDataExchange(pDX); CfguL@tR.  
 //{{AFX_DATA_MAP(CCaptureDlg) :esHtkyML  
  DDX_Control(pDX, IDC_KEY, m_Key); d;3/Vr$t=  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 6q[|U_3I@  
  DDX_Check(pDX, IDC_ALT, m_bAlt); BitP?6KX  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); B&~#.<23:  
  DDX_Text(pDX, IDC_PATH, m_Path);  R\%&Q|  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 2nW:|*:/p6  
 //}}AFX_DATA_MAP 3[g%T2&[  
} =l_B58wrx  
)uvs%hK  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) [*<F   
//{{AFX_MSG_MAP(CCaptureDlg) _;G. QwHr  
 ON_WM_SYSCOMMAND() ,9I %t%sb  
 ON_WM_PAINT() #,0PLU3%  
 ON_WM_QUERYDRAGICON() N02X*NC  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 0j^QY6  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) :Yi1#  
 ON_BN_CLICKED(ID_CHANGE, OnChange) @5!Mr5;  
//}}AFX_MSG_MAP Z*EK56.b  
END_MESSAGE_MAP() VQ5D?^'0/  
>+iJ(jqq  
BOOL CCaptureDlg::OnInitDialog() *;Q IAd  
{ b ^wL{q  
 CDialog::OnInitDialog(); &_-,Nxsf  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Y40`~  
 ASSERT(IDM_ABOUTBOX < 0xF000); &@tD/Jw3  
 CMenu* pSysMenu = GetSystemMenu(FALSE); :a M ZJm  
 if (pSysMenu != NULL) *f%uc  
 { si:p98[w  
  CString strAboutMenu; G_GV  
  strAboutMenu.LoadString(IDS_ABOUTBOX); [?3]+xr :  
  if (!strAboutMenu.IsEmpty()) uD=i-IHT  
  { (yjx+K_[  
   pSysMenu->AppendMenu(MF_SEPARATOR); p^|IN'lx,  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ]Ek6EuaK  
  } < j}n/G]  
 } _i_^s0J  
 SetIcon(m_hIcon, TRUE); // Set big icon g.wp }fz  
 SetIcon(m_hIcon, FALSE); // Set small icon _MF:?p,l  
 m_Key.SetCurSel(0); 3*< O-Jr  
 RegisterHotkey(); aDrF" j  
 CMenu* pMenu=GetSystemMenu(FALSE); s}8(__|  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); W(h].'N  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); k[9~Er+  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); `SdvX n  
 return TRUE; // return TRUE unless you set the focus to a control Aofk<O!M  
} f tS^|%p  
@>Y.s6a  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) : +Na8\d  
{ pCXceNFo  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) +Bg$]~ T  
 { Lnin;0~{  
  CAboutDlg dlgAbout; T r|B:)X  
  dlgAbout.DoModal(); ~HWH2g  
 } q]%eLfC(  
 else h<)YZ[;x  
 { nQe^Bn  
  CDialog::OnSysCommand(nID, lParam); ~#z8Q{!O  
 } bXSsN\:Y@[  
} x*]&Ca0+  
>o=O^:/L  
void CCaptureDlg::OnPaint() H =Y7#{}  
{ v2OK/W,0  
 if (IsIconic()) V}?*kx~T2C  
 { +m|S7yr'  
  CPaintDC dc(this); // device context for painting ^|u7+b'|t  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 8|Wu8z--  
  // Center icon in client rectangle d']CBoK  
  int cxIcon = GetSystemMetrics(SM_CXICON); <>=A6  
  int cyIcon = GetSystemMetrics(SM_CYICON); }e/#dMEi  
  CRect rect; %sd1`1In  
  GetClientRect(&rect); N_ 3$B=  
  int x = (rect.Width() - cxIcon + 1) / 2; mGss9eZa  
  int y = (rect.Height() - cyIcon + 1) / 2; ]!@z3Hv3  
  // Draw the icon  rG#o*oA  
  dc.DrawIcon(x, y, m_hIcon); up(6/-/.7  
 } 7Cx*Ts$  
 else Hz?C9q3BX  
 { \<cs:C\h7  
  CDialog::OnPaint(); v[k;R  
 } ZGILV  
} /INjP~C  
$KSdNFtM)A  
HCURSOR CCaptureDlg::OnQueryDragIcon() vBP 5n  
{ ~3f`=r3/.  
 return (HCURSOR) m_hIcon; <1t.f}}uX  
} T0:%,o  
d@sAB1:  
void CCaptureDlg::OnCancel() JQi+y;  
{ ~>&Jks_Q  
 if(bTray) 4Ss4jUj  
  DeleteIcon(); ^("23mhfJ  
  CDialog::OnCancel(); |hx"yy'ux  
} NOC8h\s}(  
{RG4m{#9  
void CCaptureDlg::OnAbout() v'0WE  
{ sBN"eHg  
 CAboutDlg dlg; QcW6o,  
 dlg.DoModal(); \`ya08DP(  
} l(irNKutgo  
o|Q:am'H  
void CCaptureDlg::OnBrowse() SRU }-  
{ N>zpx U {  
 CString str; I_?+;<n  
 BROWSEINFO bi; 1/JtL>SKE  
 char name[MAX_PATH]; 9i6z  p'  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); $-J0ou8~  
 bi.hwndOwner=GetSafeHwnd(); x9DG87P~+  
 bi.pszDisplayName=name; rI'kGqU  
 bi.lpszTitle="Select folder"; ^bD)Tg5K  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; =nVEdRU  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); N7Kg52|  
 if(idl==NULL) 9Dat oi  
  return; !^[i"F:G  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); AVn?86ri  
 str.ReleaseBuffer(); $Ph T:  
 m_Path=str; teQ <v[W.  
 if(str.GetAt(str.GetLength()-1)!='\\') OON]E3yy  
  m_Path+="\\"; *KMW6dg;  
 UpdateData(FALSE); =,MX%-2  
} QL].)Vgf  
jDO"?@+  
void CCaptureDlg::SaveBmp() [:hTwBRF  
{ sKg IKYG}T  
 CDC dc; Oax6_kmOj  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); pr=f6~Z-y  
 CBitmap bm; ;7:_:o[.  
 int Width=GetSystemMetrics(SM_CXSCREEN); .RazjXAY  
 int Height=GetSystemMetrics(SM_CYSCREEN); j7(S=  
 bm.CreateCompatibleBitmap(&dc,Width,Height); E Pd9'9S  
 CDC tdc; )ajF ca@v  
 tdc.CreateCompatibleDC(&dc); h!~Qyb>W  
 CBitmap*pOld=tdc.SelectObject(&bm); v=pkze  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); bZ5cKQ\6  
 tdc.SelectObject(pOld); -XJXl}M.  
 BITMAP btm; YcRo>:I  
 bm.GetBitmap(&btm); GLBzlZ?  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {uCX F~v  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Eo) #t{{  
 BITMAPINFOHEADER bih; > w-fsL  
 bih.biBitCount=btm.bmBitsPixel; _c z$w5`  
 bih.biClrImportant=0; s)A=hB-V  
 bih.biClrUsed=0; -X]?ql*%`  
 bih.biCompression=0; kd=|Iip;(  
 bih.biHeight=btm.bmHeight; h,*-V 'X.k  
 bih.biPlanes=1; kB! iEoIBA  
 bih.biSize=sizeof(BITMAPINFOHEADER); y/.I<5+Bu  
 bih.biSizeImage=size; M#u~]?hS  
 bih.biWidth=btm.bmWidth; 0Tv0:c>8;(  
 bih.biXPelsPerMeter=0; hZwbYvu  
 bih.biYPelsPerMeter=0; 4[XiD*  *  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Fkvf[!Ci  
 static int filecount=0; =Hd+KvA  
 CString name; K,f"Q<sU%  
 name.Format("pict%04d.bmp",filecount++); mNQ~9OJ1  
 name=m_Path+name; nb30<h  
 BITMAPFILEHEADER bfh; 0en Bq>vr  
 bfh.bfReserved1=bfh.bfReserved2=0; _xmS$z)TO  
 bfh.bfType=((WORD)('M'<< 8)|'B'); i-YSt5iq  
 bfh.bfSize=54+size; :Z R5<Y>  
 bfh.bfOffBits=54; U =i=E}'  
 CFile bf; H %bXx-  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Y00hc8<  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); "y7IH GJ\3  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 4!U)a  
  bf.WriteHuge(lpData,size); lf9mdbm  
  bf.Close(); }m -A #4.  
  nCount++; Lz/{ q6>  
 } p Lwtm@  
 GlobalFreePtr(lpData); olxnQYFo  
 if(nCount==1) FoW|BGA~  
  m_Number.Format("%d picture captured.",nCount); 1$S`>M%a  
 else 2v\<MrL  
  m_Number.Format("%d pictures captured.",nCount); +H  SKFp  
  UpdateData(FALSE); (:|rCZC  
} X(npgkVP\  
/J5)_> R:  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 0F-%C>&g  
{ >4G~01  
 if(pMsg -> message == WM_KEYDOWN) 3%(BZ23  
 { 2EC<8}CG  
  if(pMsg -> wParam == VK_ESCAPE) [r0`D^*=  
   return TRUE; ukDaX  
  if(pMsg -> wParam == VK_RETURN) Kt`/+k)m  
   return TRUE; hQ80R B  
 } ^//`Dz  
 return CDialog::PreTranslateMessage(pMsg); ec&K}+p@  
} l Zz%W8"  
0..]c-V(G  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) oU/{<gs  
{ w{"ro~9o  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ @=6*]:p2.  
  SaveBmp(); K}( @Ek  
  return FALSE; w!rw%  
} <3fY,qw  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 9#:B_?e=  
 CMenu pop; 1wLEkp!~  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); L(q~%  
 CMenu*pMenu=pop.GetSubMenu(0); Ve[[J"ze  
 pMenu->SetDefaultItem(ID_EXITICON); m:)s UC0  
 CPoint pt; )ZMR4U$+v  
 GetCursorPos(&pt); 9CFh'>}$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); :;URLl0  
 if(id==ID_EXITICON) *[+{KJ  
  DeleteIcon(); XR+  
 else if(id==ID_EXIT) {lbNYjknS  
  OnCancel(); l&_PsnU  
 return FALSE; ]T;  
} l\_81oZ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ,DD}o  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ho%G  
 AddIcon(); 4XgzNwm  
 return res; hH~GH'dnaE  
} 2v`Q;%7O  
 s-Qq#T  
void CCaptureDlg::AddIcon() kL e{3>}j  
{ 6^sH3=#  
 NOTIFYICONDATA data; xs^wRE_  
 data.cbSize=sizeof(NOTIFYICONDATA); <"@5. f1"Y  
 CString tip; G<>h>c1>z  
 tip.LoadString(IDS_ICONTIP); I#:Dk?"O2  
 data.hIcon=GetIcon(0); OV/ &'rC  
 data.hWnd=GetSafeHwnd(); H+5S )r  
 strcpy(data.szTip,tip); N gagzsJ=  
 data.uCallbackMessage=IDM_SHELL; dYZB> OS  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; i}/Het+(  
 data.uID=98; }t0JI3  
 Shell_NotifyIcon(NIM_ADD,&data); C#@-uo2  
 ShowWindow(SW_HIDE); B) BR y%  
 bTray=TRUE; |e91KmiqJ  
} Ge ?Q)N  
|F49<7XB[~  
void CCaptureDlg::DeleteIcon() fS]Z`U"  
{ /kV5~i<1S  
 NOTIFYICONDATA data; qZ%0p*P#_  
 data.cbSize=sizeof(NOTIFYICONDATA); yJ*g ;  
 data.hWnd=GetSafeHwnd(); ,!QtViA7  
 data.uID=98; xm0(U0 >  
 Shell_NotifyIcon(NIM_DELETE,&data); ~Z}DN*S  
 ShowWindow(SW_SHOW); I_is3y0  
 SetForegroundWindow(); q"u,r6ED  
 ShowWindow(SW_SHOWNORMAL); qHu\3@px  
 bTray=FALSE; g4Nl"s*~  
} fF^A9{{BS  
XBm ^7'  
void CCaptureDlg::OnChange() C1x(4&h  
{ kZ'wXtBYe  
 RegisterHotkey(); S\sy] 1*?$  
} <_yy0G  
Tbj}04;I  
BOOL CCaptureDlg::RegisterHotkey() q{XeRQ'/  
{ /hYFOZ  
 UpdateData(); d0YQLh  
 UCHAR mask=0; XblZlWP#  
 UCHAR key=0; _xGC0f (  
 if(m_bControl) (!%w  
  mask|=4; T/?C_i  
 if(m_bAlt) #c(BBTuX  
  mask|=2; B:6VD /qC  
 if(m_bShift) 0,wmEV!)  
  mask|=1; 9P*p{O{_  
  key=Key_Table[m_Key.GetCurSel()]; 1"No~/_  
 if(bRegistered){ I+rLKGZC  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); fv:&?gc  
  bRegistered=FALSE; h]WW?.   
 } Ee^>Q*wahw  
 cMask=mask; zYEb#*Kar  
 cKey=key; <f;X s(  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); |N0RBa4%  
 return bRegistered; A\v]ZN4  
} 7Mb-v}  
aPin6L$;)  
  四、小结 MPMAFs  
J+=?taZ  
  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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