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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: /&CmO>^e  
  G P:FSprP  
  一、实现方法 ?."&MZ  
ME;n^y\8  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: D?C)BcN  
aO@ 7O*  
#pragma data_seg("shareddata") %FS$zOsgGK  
HHOOK hHook =NULL; //钩子句柄  }8@M@  
UINT nHookCount =0; //挂接的程序数目 28/ ADZ  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 mNb ?*3\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 V$"ujRp  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey QCH}-q)  
static int KeyCount =0;  %VzKqh  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 fLSXPvm  
#pragma data_seg() ,*&G1|_6  
R+nMy=I%8  
  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。  )LJnLo+  
hq:&wN 7Q  
  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: s@z}YH  
~7$&WzD  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ^qg?6S4  
cKey,UCHAR cMask) L7= Q<D<  
{ "6R 5+  
 BOOL bAdded=FALSE; z >YFyu#LF  
 for(int index=0;index<MAX_KEY;index++){ 'mH) d  
  if(hCallWnd[index]==0){ VA"*6F   
   hCallWnd[index]=hWnd; Xg=x7\V  
   HotKey[index]=cKey; GK9/D|h4  
   HotKeyMask[index]=cMask; %]gn?`O  
   bAdded=TRUE; :N<.?%Kf  
   KeyCount++; s:2|c]wQ#R  
   break; ~6pr0uyO`  
  } yC3yij<oR  
 } 2:BF[c`  
 return bAdded; 3I!?e!y3(  
} -29gL_dk.  
//删除热键 2u"7T_"2D  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =/u% c!  
{ j:}J}P  
 BOOL bRemoved=FALSE; :}h>by=  
 for(int index=0;index<MAX_KEY;index++){ rQOWLg!"  
  if(hCallWnd[index]==hWnd){ t~e<z81p  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~_9n.C  
    hCallWnd[index]=NULL; L4b:F0  
    HotKey[index]=0; ) c/% NiN  
    HotKeyMask[index]=0; < -uc."6\  
    bRemoved=TRUE; 'Q =7/dY3I  
    KeyCount--; 2+cNo9f  
    break; [U@ *1  
   } ?_oF:*~\  
  } Fi. aC;sx  
 } |.F  
 return bRemoved; RbGJ)K!  
} 7R3fqU.Rq  
;>%~9j1C  
kW`r=u  
  DLL中的钩子函数如下: 'S<%Xm  
>Jw6l0z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) qC_mu)6  
{ 8 F2|  
 BOOL bProcessed=FALSE; xy8#2  
 if(HC_ACTION==nCode) ~ ^>417>  
 { Ku/~ N#  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 $55U+)C<  
   switch(wParam) X; 5Jb  
   {  k-E{d04-2  
    case VK_MENU: F,GN[f-  
     MaskBits&=~ALTBIT; `:wvh(  
     break; aYn8 ^  
    case VK_CONTROL: hKNY+S})g  
     MaskBits&=~CTRLBIT; ~"lJ'&J}  
     break; v[TYc:L=  
    case VK_SHIFT: ~1*A  
     MaskBits&=~SHIFTBIT; !mRx$ %ul  
     break; q8Nn%o=5V  
    default: //judge the key and send message \ A%eG&  
     break; -/ x W  
   } 1[E#vdbT  
   for(int index=0;index<MAX_KEY;index++){ 4Hb $0l  
    if(hCallWnd[index]==NULL) >sD4R}\})  
     continue; w-b' LP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Vvt  ;  
    { Kzb`$CGK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); R0;ef D  
     bProcessed=TRUE; )9B:wc"  
    } 6*nAo8gl  
   } HPQ/~0$  
  } %d m-?`  
  else if((lParam&0xc000ffff)==1){ //有键按下 1|ZhPsD.}g  
   switch(wParam) ++}\v9Er  
   { GIftrYr  
    case VK_MENU: |!H?+Jj:  
     MaskBits|=ALTBIT; C#i UP|7hh  
     break; H^~.mBP n  
    case VK_CONTROL: -fgC" 2H  
     MaskBits|=CTRLBIT; ' )-M\'S$E  
     break; dQgk.k  
    case VK_SHIFT: aV`&L,Q)7E  
     MaskBits|=SHIFTBIT; CKlL~f EL  
     break; s$DrR  
    default: //judge the key and send message pi@Xkw  
     break; fd8!KO  
   } VW@ x=m  
   for(int index=0;index<MAX_KEY;index++){ t` 8!AhOgc  
    if(hCallWnd[index]==NULL) }wwe}E-e  
     continue; K"<*a"1I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) JR9$. fGJ  
    { (QB+%2v  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); tZ2K$!/B  
     bProcessed=TRUE; 2 ?|gnbE:  
    } td{O}\s7D  
   } ~%#mK:+  
  } `C_'|d<HA  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 b-@\R\T  
   for(int index=0;index<MAX_KEY;index++){ 7S$&S;  
    if(hCallWnd[index]==NULL) PT9v*3Bq~  
     continue; R4e&^tI@*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 8[bkHfI  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); DF1<JdO+  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 LS.r%:$mb  
   } K(T\9J.  
  }  m@rSz  
 } Ep~wWQh  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~2uh'e3  
} U5/qf8)yO  
>qn/<??  
  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: 7ODaX.t->  
?4z8)E9Ju  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %G?K@5?j?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kII7z;<^`  
RbQ <m!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: LH]CUfUrUE  
49 }{R/:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) DFe;4BdC  
{ TSL9ax4j  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Psa@@'w  
 { :DkAQ-<~  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Y:x/!-  
  SaveBmp(); R9r+kj_  
  return FALSE; AxCI 0  
 } PI|`vC|yy&  
 …… //其它处理及默认处理 *]s&8/Gmb  
} ';RI7)<  
h3Fo-]0  
)QY![&k}1z  
  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。 6J%iZ  
en9en=n|  
  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。 _$/ +D:K  
Sl~x$9`  
  二、编程步骤 =^h~!ovj:  
<%bw/  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; S|R|]J|  
3@5p"X  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 8&}~'4[b[$  
xRDiRj  
  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; 3vJ12=  
d*;$AYI#R  
  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; $W!]fcZlB  
<>4!XPo%J  
  5、 添加代码,编译运行程序。 ;R[&pDx  
zp=!8Av  
三、程序代码 }++5_Z_  
'M'w,sID  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL K5 vNhA  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) -S; &Q'Mt  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ <fM>Yi5  
#if _MSC_VER > 1000 9Z!lmfnJ  
#pragma once @?2n]n6  
#endif // _MSC_VER > 1000 g0#q"v55  
#ifndef __AFXWIN_H__ )&Z>@S^  
#error include 'stdafx.h' before including this file for PCH K&pM o.  
#endif G%w_CMfH  
#include "resource.h" // main symbols izt^Wi|  
class CHookApp : public CWinApp 9NIy#  
{ p$!@I  
 public: B.-A $/  
  CHookApp(); 2mJ:c  
  // Overrides c%<2z  
  // ClassWizard generated virtual function overrides ` %' z  
  //{{AFX_VIRTUAL(CHookApp) Ao`_",E  
 public: b>q6:=((  
  virtual BOOL InitInstance(); 6 S*zzJ.0K  
  virtual int ExitInstance(); 6$B'Q30}r  
  //}}AFX_VIRTUAL LZ&uj{ <  
  //{{AFX_MSG(CHookApp) b!~TAT&8  
  // NOTE - the ClassWizard will add and remove member functions here.  *q"G }  
  // DO NOT EDIT what you see in these blocks of generated code ! [V< 1_zqt  
  //}}AFX_MSG 5~\Kj#PBx  
  DECLARE_MESSAGE_MAP() N+>'J23d!  
}; ,OBQv.D3>a  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); t* z'c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5upShtC  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w yD%x(  
BOOL InitHotkey(); I #l;~a<9z  
BOOL UnInit(); >_#)3K1y8  
#endif g.*&BXZi  
{a4xF2  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. (Nt[v;BnO  
#include "stdafx.h" D=w9cKa  
#include "hook.h" 9H$g?';  
#include <windowsx.h> $y6rvQ 2>S  
#ifdef _DEBUG 3bH5C3(u  
#define new DEBUG_NEW 7jezw'\=~  
#undef THIS_FILE )l2P}k7`  
static char THIS_FILE[] = __FILE__; `Yogq)G}  
#endif -c$z 2Q)  
#define MAX_KEY 100 92(~'5Qr  
#define CTRLBIT 0x04 S1C^+Sla]  
#define ALTBIT 0x02 0}-#b7eR  
#define SHIFTBIT 0x01 RdkU2Y}V  
#pragma data_seg("shareddata") S_T  
HHOOK hHook =NULL; kbq:U8+k  
UINT nHookCount =0; T+W3_xISX  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 8on[%Vk  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT JFJIls  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey oQBiPN+v.3  
static int KeyCount =0; 1,u{&%yL"w  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift QJM(UfHUD  
#pragma data_seg() n `#+L~X  
HINSTANCE hins; z\h, SX<U  
void VerifyWindow(); W8uVd zQ   
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) %QE5<2k  
//{{AFX_MSG_MAP(CHookApp) 8 DL hk  
// NOTE - the ClassWizard will add and remove mapping macros here. 4^MSX+zt  
// DO NOT EDIT what you see in these blocks of generated code! tBTJmih"  
//}}AFX_MSG_MAP ,# iZS&  
END_MESSAGE_MAP() )6C`&Mj  
T:)% P6/  
CHookApp::CHookApp() ._K$0U!  
{ hwZ6 .  
 // TODO: add construction code here, \vs%U}IrO  
 // Place all significant initialization in InitInstance T"A^[ r*  
} t!l/`e%J  
<!hpfTz*  
CHookApp theApp; <dJIq"){  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) CMKhS,,o  
{ 9M0d+:YJ  
 BOOL bProcessed=FALSE; +QQ YPEx+  
 if(HC_ACTION==nCode) Ahd\TH  
 { x{QBMe`  
  if((lParam&0xc0000000)==0xc0000000){// Key up IE@ z@+\(  
   switch(wParam) G#g{3}dcK  
   { ?V6 %>RU  
    case VK_MENU: [M<{P5q  
     MaskBits&=~ALTBIT; (-#rFO5~l  
     break; dd19z%  
    case VK_CONTROL: Cl-S=q@>V  
     MaskBits&=~CTRLBIT; tbRE/L<  
     break; SDJ;*s-  
    case VK_SHIFT: l92!2$]b  
     MaskBits&=~SHIFTBIT; $ #t|(\  
     break; &:C{/QnA  
    default: //judge the key and send message 3P3:F2S R  
     break; +0dQORo  
   } O '@m4@L   
   for(int index=0;index<MAX_KEY;index++){ 0\ZaMu #  
    if(hCallWnd[index]==NULL) wFn@\3%l`  
     continue; AE]i V{p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )fy <P;g  
    { ~t$mw,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); A &;EV#]ge  
     bProcessed=TRUE; Y]M^n&f  
    } ;*"!:GR%h  
   } 3a/[."W u  
  } #efqG=q  
  else if((lParam&0xc000ffff)==1){ //Key down %h3L  
   switch(wParam) k>$FT `  
   { EI%M Azj}  
    case VK_MENU: =]WW'~  
     MaskBits|=ALTBIT; @-}D7?  
     break; $8EV, 9^U  
    case VK_CONTROL: A4}JZi6@  
     MaskBits|=CTRLBIT; IsWcz+1n  
     break; ^#}dPGm  
    case VK_SHIFT: [U% .Gi  
     MaskBits|=SHIFTBIT; ef^Cc)S-Q  
     break; 1mY+0  
    default: //judge the key and send message 0I(uddG3  
     break; ntDRlX  
   } ;`;G/1]#9  
   for(int index=0;index<MAX_KEY;index++) Z={D0`  
   { [..,(  
    if(hCallWnd[index]==NULL) xcAF  
     continue; ?,D>+::  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .A )\F",X  
    { 0,;E.Py?.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); d*]Dv,#X  
     bProcessed=TRUE; d'x<- l9  
    } xYT#!K1*  
   } &e/@yu)x,  
  } FLi(#9  
  if(!bProcessed){ o(?VX`2"  
   for(int index=0;index<MAX_KEY;index++){ 782[yLyv  
    if(hCallWnd[index]==NULL) s$js5 ou  
     continue; k, $I59  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 97['VOh0  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); J(3gT }z-  
   } T_(qN;_  
  } *(@L+D0N  
 } M@',3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); jc${.?m  
} ._8xY$l$  
dM$N1DB{U+  
BOOL InitHotkey() bbfDt^  
{ N |OMj%Uk  
 if(hHook!=NULL){ CpUI|Rs  
  nHookCount++; g5lmUKlQ$0  
  return TRUE; % JgRcx  
 } iSSc5ek4  
 else e{^:/WcYB  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); P-/XYZ]`  
  if(hHook!=NULL) stf,<W  
   nHookCount++; {m?K2]](  
  return (hHook!=NULL); U:s} /to  
} *#9VC)Q  
BOOL UnInit() |@T5$Xg]5  
{ o(B<!ji~'  
 if(nHookCount>1){ J=f:\]@Oy  
  nHookCount--; v_?s1+w  
  return TRUE; owfp^hla  
 } B2ek&<I7N  
 BOOL unhooked = UnhookWindowsHookEx(hHook); :t2 9`x  
 if(unhooked==TRUE){ Z;|0"K  
  nHookCount=0; vjOG?-  
  hHook=NULL; 2VoEQ  
 } lM@<_=2  
 return unhooked; aF; ]7i@  
} &CB.*\0  
hqhu^.}]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <3i4NXnL2  
{ I_"Hgx<  
 BOOL bAdded=FALSE; -13P 2<i+  
 for(int index=0;index<MAX_KEY;index++){ WH pUjyBP  
  if(hCallWnd[index]==0){ iBGSBSeL&  
   hCallWnd[index]=hWnd; 3p?<iVE  
   HotKey[index]=cKey; =j'J !M  
   HotKeyMask[index]=cMask; r`&2-]  
   bAdded=TRUE; vF*^xhh  
   KeyCount++; 0?J|C6XM#4  
   break; E<X{72fb>  
  } RTgQ#<W8  
 } IGh !d?D  
 return bAdded; d- Z+fz  
} Rye ~w6  
}[=xe(4]D  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I =tyQ`  
{ 4 ~MJ4:  
 BOOL bRemoved=FALSE; Zq\RNZ}  
 for(int index=0;index<MAX_KEY;index++){ 2$j Ot}  
  if(hCallWnd[index]==hWnd){ AHp830\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ QK``tWLIg7  
    hCallWnd[index]=NULL; #Lhj0M;a  
    HotKey[index]=0; RTPq8S"  
    HotKeyMask[index]=0; Tc'{i#%9j  
    bRemoved=TRUE; #f|NM7  
    KeyCount--; 'XZI{q2i  
    break; A-Q{*{^#  
   } .pB8=_e:  
  } ${E[pT  
 } 0gwm gc/#  
 return bRemoved; ?d>P+).  
} "2#-xOCO  
n!l./>N  
void VerifyWindow() ]RJb;  
{ Oet#wp/I  
 for(int i=0;i<MAX_KEY;i++){ 1Rb XM n  
  if(hCallWnd!=NULL){ !yV,|)y5F  
   if(!IsWindow(hCallWnd)){ ]]h:#A2  
    hCallWnd=NULL; Y^94iOk%T  
    HotKey=0; ?'ez.a}  
    HotKeyMask=0; 5 CY_Ay\  
    KeyCount--; EL 8N[]RF  
   } [G'!`^V,  
  } [0tf Y0  
 } 3gPD(r1g  
} $p}~,Kp/  
$$bTd3N+  
BOOL CHookApp::InitInstance() XL.CJ5y>  
{ Z}'F"}QI  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1{hoO<CJ  
 hins=AfxGetInstanceHandle(); Z3abem<Q  
 InitHotkey(); p^4;fD  
 return CWinApp::InitInstance(); @qO8Jg"Q  
} #pDGaqeX  
Bp$+ F/  
int CHookApp::ExitInstance() t=E|RYC(k  
{ !CVBG *E^l  
 VerifyWindow(); D_ Bx>G9  
 UnInit(); C+L_61  
 return CWinApp::ExitInstance(); }Pm(oR'KTJ  
} $_URXI  
NrI 5uC7  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ulPrb>i  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) LrM.wr zI/  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ O yH!V&w  
#if _MSC_VER > 1000 4U! .UNi  
#pragma once "z#?OV5  
#endif // _MSC_VER > 1000 cyHak u+  
+/~\b/  
class CCaptureDlg : public CDialog ].<sAmL^  
{ #<tWYE  
 // Construction jL7MmR#y5"  
 public: avxn}*:X.  
  BOOL bTray; yf#%)-7(  
  BOOL bRegistered; e??{&[  
  BOOL RegisterHotkey(); -'H+lrmv  
  UCHAR cKey; {Hp}F!X$  
  UCHAR cMask; !6tC[W`  
  void DeleteIcon(); +U_-Lq )  
  void AddIcon(); \_I)loPc8  
  UINT nCount; $R$c1C'oX  
  void SaveBmp(); ]tdo&  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor _#YHc[Wz  
  // Dialog Data (15Yw9Mv  
  //{{AFX_DATA(CCaptureDlg) [P&,}o)+E0  
  enum { IDD = IDD_CAPTURE_DIALOG }; "! 6 B5Oz  
  CComboBox m_Key;  oRbYna?J  
  BOOL m_bControl; iQ]c k-  
  BOOL m_bAlt; aWsKJo>j[#  
  BOOL m_bShift; WtdkA Sj  
  CString m_Path; 7f\^VG  
  CString m_Number; \2<yZCn  
  //}}AFX_DATA xu?QK6D:  
  // ClassWizard generated virtual function overrides \]`(xxt1  
  //{{AFX_VIRTUAL(CCaptureDlg) ~oW8GQ  
 public: *UL|{_)c  
  virtual BOOL PreTranslateMessage(MSG* pMsg); >ya-  
 protected: )p^jsv.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ae_ E;[mj  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); @x F8' [<  
  //}}AFX_VIRTUAL +#JhhW Zj(  
  // Implementation (&]15 FJ$1  
 protected: =ci5&B?  
  HICON m_hIcon; f93X5hFnF  
  // Generated message map functions tEX~72v  
  //{{AFX_MSG(CCaptureDlg) s^t1PfP(,  
  virtual BOOL OnInitDialog(); POg0=32  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); |16BidWi  
  afx_msg void OnPaint(); &|{,4V0%A  
  afx_msg HCURSOR OnQueryDragIcon(); L{0OMyUA  
  virtual void OnCancel(); }.$ B1%2  
  afx_msg void OnAbout(); x5 ~E'~_  
  afx_msg void OnBrowse(); 4b(irDT3F  
  afx_msg void OnChange(); U}wq~fD  
 //}}AFX_MSG vzm4  
 DECLARE_MESSAGE_MAP() 3N%Ev o  
}; Rw{v"n  
#endif e/Oj T  
~m|?! ]n  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file l/UG+7  
#include "stdafx.h" x0;}b-f  
#include "Capture.h" PZhZK VZx  
#include "CaptureDlg.h" geN%rD  
#include <windowsx.h> kJeOlO[  
#pragma comment(lib,"hook.lib") U?ic$J]N  
#ifdef _DEBUG D&m"~wI  
#define new DEBUG_NEW 9la~3L_g  
#undef THIS_FILE Tc(v\|F,  
static char THIS_FILE[] = __FILE__; .F3LA6se  
#endif h>%JG'DV  
#define IDM_SHELL WM_USER+1 jTgh+j]AP  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~S>ba']  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }3_G|  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Iw |[*Nu-  
class CAboutDlg : public CDialog a4.: i  
{ ~JPzjE  
 public: 3M*[a~  
  CAboutDlg(); GWZXRUc  
  // Dialog Data j2qfEvU  
  //{{AFX_DATA(CAboutDlg) <\~#\A=;  
  enum { IDD = IDD_ABOUTBOX }; % P)}(e6y  
  //}}AFX_DATA P1>X5:  
  // ClassWizard generated virtual function overrides OYp8r  
  //{{AFX_VIRTUAL(CAboutDlg) lFV|GJ  
 protected: FEmlC,%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]b| @<E7Y  
  //}}AFX_VIRTUAL 64X#:t+  
  // Implementation (3r,PS@Qq@  
 protected: T2;  9  
  //{{AFX_MSG(CAboutDlg) h#ot)m|I  
  //}}AFX_MSG =xet+;~ji  
  DECLARE_MESSAGE_MAP() =~m"TQv  
}; s? #lhI  
7uNI  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5g2+Ar(  
{ V=MZOj6  
 //{{AFX_DATA_INIT(CAboutDlg) j5^b~F%  
 //}}AFX_DATA_INIT R_&z2I  
} $*-L8An?  
K3D $ hb  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "TJ^Z!  
{ @il}0  
 CDialog::DoDataExchange(pDX); i~L7h=__  
 //{{AFX_DATA_MAP(CAboutDlg) 'B6H/d>  
 //}}AFX_DATA_MAP Hv*O9!cC  
} n7uD(cL  
l'\b(3JF  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) tb\pjLB][  
 //{{AFX_MSG_MAP(CAboutDlg) S]g)^f'a65  
 // No message handlers xyz86r ^u  
 //}}AFX_MSG_MAP !P3|T\|]+  
END_MESSAGE_MAP() ".<p R} qp  
r1atyK  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) QjU"|$  
: CDialog(CCaptureDlg::IDD, pParent) wJkkc9Rh'(  
{ our5k   
 //{{AFX_DATA_INIT(CCaptureDlg) @R{&>Q:.  
  m_bControl = FALSE; # t Ki6u  
  m_bAlt = FALSE; V'/%)oU\"  
  m_bShift = FALSE; jQ}| ]pj+  
  m_Path = _T("c:\\"); _ 0E,@[  
  m_Number = _T("0 picture captured."); /[5up  
  nCount=0; '~J6 mojE  
  bRegistered=FALSE; t%@ pyK  
  bTray=FALSE; L 3@wdC ~0  
 //}}AFX_DATA_INIT >,vuC4v-  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 6si-IJ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 7yl'!uz)9  
} MsQS{ok+  
ApB0)N  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Z9I./s9  
{ cTp+M L  
 CDialog::DoDataExchange(pDX); W0k q>s4  
 //{{AFX_DATA_MAP(CCaptureDlg) UxtZBNn8  
  DDX_Control(pDX, IDC_KEY, m_Key); 1| DI'e[X  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5Ncd1  
  DDX_Check(pDX, IDC_ALT, m_bAlt); U+ =q_ <  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); pE N`&'4  
  DDX_Text(pDX, IDC_PATH, m_Path); OQvJdjST  
  DDX_Text(pDX, IDC_NUMBER, m_Number); xd<68%Cn  
 //}}AFX_DATA_MAP +\chHOsw  
} + aF jtb  
6}$cDk`dz  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) GkFNLM5'  
//{{AFX_MSG_MAP(CCaptureDlg) mgWtjV 8  
 ON_WM_SYSCOMMAND() qFk(UazN  
 ON_WM_PAINT() ^*OA%wg3=h  
 ON_WM_QUERYDRAGICON() &IYkeGQr  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) /o2eKx  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 6"(&lK\^  
 ON_BN_CLICKED(ID_CHANGE, OnChange) hlZjk0ez  
//}}AFX_MSG_MAP ?}>tfDu'  
END_MESSAGE_MAP() { L5m`-x  
[tN/}_]  
BOOL CCaptureDlg::OnInitDialog() x!+ a,+G  
{ edQ><lz  
 CDialog::OnInitDialog(); vI@8DWs  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ) LG/n  
 ASSERT(IDM_ABOUTBOX < 0xF000); Lsdu:+-  
 CMenu* pSysMenu = GetSystemMenu(FALSE); y (A"g3^=  
 if (pSysMenu != NULL) o%a$m9I  
 { @[Th{HTc.G  
  CString strAboutMenu; $B2@mC([S  
  strAboutMenu.LoadString(IDS_ABOUTBOX); MgekLP )&  
  if (!strAboutMenu.IsEmpty()) )j]RFt  
  { :`K;0`C +  
   pSysMenu->AppendMenu(MF_SEPARATOR); sMx\WTyz  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ]{hfM  
  } ~ocr^V{"<~  
 } VbjFQ@[l!  
 SetIcon(m_hIcon, TRUE); // Set big icon w'!gLta  
 SetIcon(m_hIcon, FALSE); // Set small icon ^&}Y>O,  
 m_Key.SetCurSel(0); H;6V  
 RegisterHotkey(); ! [X<>  
 CMenu* pMenu=GetSystemMenu(FALSE); ,x/j&S9!  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); kL-+V)Kl  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); So:89T  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); .JqIAC~  
 return TRUE; // return TRUE unless you set the focus to a control QS_u<B  
} Z& %61jGK  
= 4If7  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) &Ru6Yt0W  
{ d={}a,3?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) .jCdJ =z  
 { L`\ILJz  
  CAboutDlg dlgAbout; }7V/(K  
  dlgAbout.DoModal(); vv u((b  
 } wv<"W@& 9  
 else 7Q`4*H6  
 { [;(| ^0  
  CDialog::OnSysCommand(nID, lParam); 46vz=# ,6L  
 } x~W&a*WNT  
} /mb| %U]~  
5XhV+t g.  
void CCaptureDlg::OnPaint() by {~gu  
{ DeUDZL%/  
 if (IsIconic()) "Xm'(c(  
 { ,=mn*  
  CPaintDC dc(this); // device context for painting aU3&=aN+  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Bpgl U=Qr  
  // Center icon in client rectangle h41v}5!-  
  int cxIcon = GetSystemMetrics(SM_CXICON); 8S0)_L#S  
  int cyIcon = GetSystemMetrics(SM_CYICON); xZkLN5I{  
  CRect rect; *"#>Ov>  
  GetClientRect(&rect); {M=tw  
  int x = (rect.Width() - cxIcon + 1) / 2; `);`E_'U k  
  int y = (rect.Height() - cyIcon + 1) / 2; S4Rv6{r:  
  // Draw the icon i_MDLS>-  
  dc.DrawIcon(x, y, m_hIcon); K1Tzy=Z9j  
 } ;{>z\6N  
 else (Yx rZ_F'b  
 { Q>.-u6(&  
  CDialog::OnPaint(); M?_VYK  
 } Cc=`:ED+  
} 0c]Lm?&  
;a68>5Lm*  
HCURSOR CCaptureDlg::OnQueryDragIcon() y"7?]#$9/  
{ `+<5QtD  
 return (HCURSOR) m_hIcon; ~2pctqMA  
} Tj.;\a|d  
K$rH{dUM  
void CCaptureDlg::OnCancel()  Jl}$) '  
{ 7Npz {C{I  
 if(bTray) Qd@`jwjS  
  DeleteIcon(); 0.?|%;^ib  
  CDialog::OnCancel(); r|&qXb x  
} ;VvqKyUh7`  
hG3b7!^#g  
void CCaptureDlg::OnAbout() ecr pv+  
{ `/#6k>  
 CAboutDlg dlg; z7J#1q~:yY  
 dlg.DoModal(); -FJ 5N}R  
} >V NMQ  
Z,ag5 w`]L  
void CCaptureDlg::OnBrowse() TVKuvKH8U  
{ &C?]n.A  
 CString str; K^9!Qp  
 BROWSEINFO bi; 7:;P>sF@  
 char name[MAX_PATH]; C#(4>'  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); w(s"r p}  
 bi.hwndOwner=GetSafeHwnd(); W| ~Ehg  
 bi.pszDisplayName=name; BjJ+~R  
 bi.lpszTitle="Select folder"; AWGeK-^  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ]_j{b)t  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 7ej"q  
 if(idl==NULL) 2T iUo(MK  
  return; 7j{SCE;  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); eFbr1IV  
 str.ReleaseBuffer(); y&B~UeB:q  
 m_Path=str; m ?LOd9  
 if(str.GetAt(str.GetLength()-1)!='\\') }F**!%4d  
  m_Path+="\\"; r\a9<nZ{  
 UpdateData(FALSE); |UE&M3S  
} WM:we*k8h  
YG<?|AS/  
void CCaptureDlg::SaveBmp() D@&0 P&  
{ eZT923tD  
 CDC dc; HBeOK  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); b?qtTce  
 CBitmap bm; p-r}zc9@  
 int Width=GetSystemMetrics(SM_CXSCREEN); aw {?UvL&  
 int Height=GetSystemMetrics(SM_CYSCREEN); vY:A7yGW  
 bm.CreateCompatibleBitmap(&dc,Width,Height); !bS:!Il9=  
 CDC tdc; 4w\cS&X~C  
 tdc.CreateCompatibleDC(&dc); A)&OR]0[  
 CBitmap*pOld=tdc.SelectObject(&bm); 5 J61PuH   
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6 O!&!  
 tdc.SelectObject(pOld); jv?`9{-  
 BITMAP btm; o"J}@nF  
 bm.GetBitmap(&btm); v 4DF #O  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; },e f(  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); .{*V^[.  
 BITMAPINFOHEADER bih; d7qHUx'=z  
 bih.biBitCount=btm.bmBitsPixel; Ft#d & I  
 bih.biClrImportant=0; ci <`*>l  
 bih.biClrUsed=0; e@F9'z4  
 bih.biCompression=0; *O+G}_}  
 bih.biHeight=btm.bmHeight; t[Xx LG*  
 bih.biPlanes=1; -tlRe12  
 bih.biSize=sizeof(BITMAPINFOHEADER); ;3-5U&Axt  
 bih.biSizeImage=size; Yc BY[i0  
 bih.biWidth=btm.bmWidth; ]2+7?QL,  
 bih.biXPelsPerMeter=0; bO^#RVH  
 bih.biYPelsPerMeter=0; F\ yxXOI  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); m$Lq#R={Z  
 static int filecount=0; }PTYNidlR  
 CString name; dd@qk`Zl&A  
 name.Format("pict%04d.bmp",filecount++); K1AI:$H  
 name=m_Path+name; uhz:G~x!  
 BITMAPFILEHEADER bfh; y+hC !-  
 bfh.bfReserved1=bfh.bfReserved2=0; $*tq$DZ4&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); =X'i^Q  
 bfh.bfSize=54+size; iP6$;Y{ZA  
 bfh.bfOffBits=54; 7y1J69IK  
 CFile bf; :,X,!0pWRp  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _@3@_GE  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); WLma)L`L  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Xt %;]1n  
  bf.WriteHuge(lpData,size); (iXo\y`z  
  bf.Close(); P,^`|\#7  
  nCount++; M.iR5Uh  
 } hqd}L~o:  
 GlobalFreePtr(lpData); Dm?>U1{   
 if(nCount==1) {{7%z4l  
  m_Number.Format("%d picture captured.",nCount);  c %w h  
 else vtM!?#  
  m_Number.Format("%d pictures captured.",nCount); tt2`N3Eu\  
  UpdateData(FALSE); .{%~4$yu7  
} TR/'L!EE  
n>T1KC%  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) k\W%^Z  
{ v<c~ '?YzO  
 if(pMsg -> message == WM_KEYDOWN) ?&W1lYY  
 { AQ:cim `  
  if(pMsg -> wParam == VK_ESCAPE) 6m"_=.k%  
   return TRUE; bU9B2'%E  
  if(pMsg -> wParam == VK_RETURN) 28>PmH]7  
   return TRUE; GP6-5Y"8  
 } !g{9]"Z1T  
 return CDialog::PreTranslateMessage(pMsg); 4)./d2/E  
} O&YX V  
y1z<{'2x  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) s\A"B#9r  
{ hyqsMkW|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ '# K:e  
  SaveBmp(); vX|ZPn#  
  return FALSE; SEsc"l8  
} &(a#I]`9M  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `vs= CYs  
 CMenu pop; O]rAo  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); (GB2("p`  
 CMenu*pMenu=pop.GetSubMenu(0); dXR 70/  
 pMenu->SetDefaultItem(ID_EXITICON); c^0Yu Bps[  
 CPoint pt;  Gh;Ju[6  
 GetCursorPos(&pt); Y Y4"r\V  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ]4f;%pE  
 if(id==ID_EXITICON) uJ ;7]  
  DeleteIcon(); rF C6"_  
 else if(id==ID_EXIT) ^~~&[wY  
  OnCancel(); &E|2-)  
 return FALSE; P{2V@ <}  
} 0\3mS{s  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); :.KN;+tP  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) v"'Co6fw  
 AddIcon(); LDDeZY"xd  
 return res; :C6  
} #Hm*<s.  
V mxVE=l  
void CCaptureDlg::AddIcon() u;1/.`NPB  
{ ie4keVlXc  
 NOTIFYICONDATA data; X"QIH|qx-  
 data.cbSize=sizeof(NOTIFYICONDATA); g%()8QxE1  
 CString tip; ZI"L\q=|0#  
 tip.LoadString(IDS_ICONTIP); S;a'@5  
 data.hIcon=GetIcon(0); eeI aH >  
 data.hWnd=GetSafeHwnd(); m# #( uSh  
 strcpy(data.szTip,tip); 3I!xa*u  
 data.uCallbackMessage=IDM_SHELL; cBICG",TA  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .XPcH(q  
 data.uID=98; gq9D#B  
 Shell_NotifyIcon(NIM_ADD,&data); &0B< iO<f  
 ShowWindow(SW_HIDE); a^yBtb~,P  
 bTray=TRUE; 3#fu; ??1.  
} Q\(VQ1c  
[$; \1P/  
void CCaptureDlg::DeleteIcon() m)G=4kK52-  
{ v(ABZNIn  
 NOTIFYICONDATA data; IT,d(UV_  
 data.cbSize=sizeof(NOTIFYICONDATA); w)x`zVwO  
 data.hWnd=GetSafeHwnd(); eL)* K>T  
 data.uID=98; Be"Swz(n  
 Shell_NotifyIcon(NIM_DELETE,&data); ]RYk Y7>`  
 ShowWindow(SW_SHOW); -QH[gi{%`  
 SetForegroundWindow(); J?/.|Y]e  
 ShowWindow(SW_SHOWNORMAL); uP,{yna(  
 bTray=FALSE; /4 zO  
} 7%rSo^t,L  
Fy4jujP<  
void CCaptureDlg::OnChange() x;H#-^LxW=  
{ |12Cg>;j*n  
 RegisterHotkey(); oicett=5  
} **\BP,]}  
e|wH5(V  
BOOL CCaptureDlg::RegisterHotkey() z-(#Mlq:!  
{ ucm 3'j  
 UpdateData(); "BB#[@  
 UCHAR mask=0; 1FfdW>ay*  
 UCHAR key=0; gcImk0NIY  
 if(m_bControl) )tQG5.to  
  mask|=4; }qUNXE@  
 if(m_bAlt) s>sIji  
  mask|=2; 4m++>q  
 if(m_bShift) [BS3y`c  
  mask|=1; jF}zv  
  key=Key_Table[m_Key.GetCurSel()]; KMz\h2X  
 if(bRegistered){ b`Wn98s  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); G?-27Jk8  
  bRegistered=FALSE; hjiU{@q  
 } !Ju?REH   
 cMask=mask; NN5V|# P}  
 cKey=key; 7I;Give{  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); rl)(4ad=  
 return bRegistered; 9kPwUAw  
} fShf4G_w\  
p},6W,f  
  四、小结 qB3{65  
N" |^AF  
  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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