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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: a* D|$<V  
  07MLK8jS  
  一、实现方法 #nxx\,i>  
u4nXK <KL|  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: xAO ]u[J  
h7w<.zwu t  
#pragma data_seg("shareddata") U!`'Qw;  
HHOOK hHook =NULL; //钩子句柄 * K7L5.  
UINT nHookCount =0; //挂接的程序数目 q>X:z0H  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 \ lKQ'_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 |% kK?!e+-  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey )- \w  
static int KeyCount =0; Umd!j,  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 S:j0&*  
#pragma data_seg() |UaI i^  
Q6>vF)( -  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 b$ eJH  
eyG.XAP  
  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: 0VZj;Jg}q  
Y\=:j7'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 3k(?`4JJ  
cKey,UCHAR cMask) QRjt.Ry|  
{ t2gjhn^p  
 BOOL bAdded=FALSE; e8#3Y+Tc  
 for(int index=0;index<MAX_KEY;index++){ %)e+w+  
  if(hCallWnd[index]==0){ *~"`&rM(  
   hCallWnd[index]=hWnd; 0k>&MkM\^  
   HotKey[index]=cKey; 6]3 ZUH;  
   HotKeyMask[index]=cMask; W | }Hl{}  
   bAdded=TRUE; 7wnzef?)  
   KeyCount++; PLyu1{1" z  
   break; _aGdC8%[  
  } WI9.?(5q  
 } 7lpVK]  
 return bAdded; X>4`{x`  
} 9..k/cH  
//删除热键 a]k&$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z8@]e}n  
{ u0e#iX  
 BOOL bRemoved=FALSE; |{nI.>  
 for(int index=0;index<MAX_KEY;index++){ LKZI@i)  
  if(hCallWnd[index]==hWnd){ 5zGj,y>u  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ aVb]H0  
    hCallWnd[index]=NULL; nX S%>1o,  
    HotKey[index]=0; 525 >=h  
    HotKeyMask[index]=0; +NY4j-O  
    bRemoved=TRUE; ]3,0 8JW=  
    KeyCount--; L_r & 'B  
    break; CvJm7c  
   } N'1~wxd  
  } :&%;s*-9  
 } 6. jZy~  
 return bRemoved; Hn~1x'$  
} 6b|`[t  
ChGM7uu2  
gK(4<PO'  
  DLL中的钩子函数如下: NZuFxJ-`  
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LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Y P c<  
{ <7^~r(DP  
 BOOL bProcessed=FALSE; Zy%Z]dF  
 if(HC_ACTION==nCode) yDC97#%3u  
 { ,Ai i>D]  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ;cr6Xop#?  
   switch(wParam) GP$ Y4*y/  
   {  B,>FhX>h  
    case VK_MENU: U VKN#"_{  
     MaskBits&=~ALTBIT; ^4[[+r  
     break; Q(6(Scp{  
    case VK_CONTROL: "Zk6B"o)  
     MaskBits&=~CTRLBIT; DE ws+y-*  
     break; VZoOdR:d  
    case VK_SHIFT: \sd"iMEi  
     MaskBits&=~SHIFTBIT; C":\L>Ax  
     break; DO1{r/Ib.{  
    default: //judge the key and send message l'T0<  
     break; ^Q>*f/.KN  
   } xW =$j|  
   for(int index=0;index<MAX_KEY;index++){ Ol[gck|~  
    if(hCallWnd[index]==NULL) o }A #-   
     continue; ea0tx3'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HqBPY[;s  
    { >G2-kL_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); PuaosMn(9  
     bProcessed=TRUE; CE,O m^  
    } @U{M"1zZe  
   } #:|?t&On  
  } JZzf,G:  
  else if((lParam&0xc000ffff)==1){ //有键按下 RHVv}N0  
   switch(wParam) '.yWL  
   { F*}Q^%  
    case VK_MENU: |sa7Y_  
     MaskBits|=ALTBIT; 5-HJ&Q  
     break; ,d>~='  
    case VK_CONTROL: U_'q-*W  
     MaskBits|=CTRLBIT; ,~xU>L^  
     break; "}p?pF<'0  
    case VK_SHIFT: >` QX xTn  
     MaskBits|=SHIFTBIT; g{hA,-3  
     break; [Z\1"m  
    default: //judge the key and send message +3>/,w(x  
     break; x 5Dt5Yp"o  
   } D~OhwsL4  
   for(int index=0;index<MAX_KEY;index++){ %k #Nu  
    if(hCallWnd[index]==NULL) *hs<Ez.cC  
     continue; p0y?GNQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SsX05>  
    { p,\bez  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {K4t8T]  
     bProcessed=TRUE; [E (M(w':  
    } tcEf ~|3  
   } lO> 7`2x=F  
  } YBIe'(p  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 MIF[u:&  
   for(int index=0;index<MAX_KEY;index++){ @^cgq3H'  
    if(hCallWnd[index]==NULL) [; ?{BB  
     continue; 0DIM]PS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) kZ-~ ;fBe  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,7jiHF  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 *.%)rm  
   } hX| UE  
  } 0Y*gJ!a  
 } KH>sCEt  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <S@mQJS!y  
} vC<kpf!  
t0H=NUP8  
  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: irb.F>(x  
u6I0<i_KZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); H0 n@kKr  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W?J*9XQ`  
s*/ G- lY  
  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: 36WzFq#  
'3UIriY6  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) s k6|_  
{ ,tF" 4|#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Bj($_2M%+  
 { u|>U`[Zpj  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 [I<'E LX  
  SaveBmp(); MQH8Q$5D  
  return FALSE; O\F^@;] F6  
 } *Gh8nQbh  
 …… //其它处理及默认处理 1qKxg  
} k>;r9^D  
I u~aTgHX%  
Doc'7P  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 'A(-MTd%  
:G=1$gb  
  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。 rn[}{1I33Q  
VE"0 VB.  
  二、编程步骤 &R FM d=  
lPQ Ut!xI  
  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"; \]#;!6ge  
ySK Yqt z  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; \3(| c#c  
UH,4b`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; NT9- j#V  
!na0Y  
  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; t2%@py*bU  
2X;0z$  
  5、 添加代码,编译运行程序。 WlRZ|.  
}%ZG> LG5J  
三、程序代码 0/00 W6r0  
lyH X#]  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL )tI2?YIR  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Nw$[a$^n  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ VDu .L8  
#if _MSC_VER > 1000 L5qCv -{  
#pragma once I;.! hV>E  
#endif // _MSC_VER > 1000 &B7+>Ix,  
#ifndef __AFXWIN_H__ ?)o4 Kt'h  
#error include 'stdafx.h' before including this file for PCH t k/K0u  
#endif >;&V~q:di  
#include "resource.h" // main symbols Y=Ar3O*F  
class CHookApp : public CWinApp yH"$t/cU"R  
{ i&'^9"Z)O  
 public: [F V=@NI  
  CHookApp(); ':2*+  
  // Overrides U>B5LU9&  
  // ClassWizard generated virtual function overrides k5%0wHpk=  
  //{{AFX_VIRTUAL(CHookApp) xBE RCO^  
 public: UFIAgNKl  
  virtual BOOL InitInstance(); D7_Hu'y<o  
  virtual int ExitInstance(); Jn@Mbl  
  //}}AFX_VIRTUAL cM<hG:4%wX  
  //{{AFX_MSG(CHookApp) 0@e}hv;  
  // NOTE - the ClassWizard will add and remove member functions here. {Fp`l\,  
  // DO NOT EDIT what you see in these blocks of generated code ! vz #wP  
  //}}AFX_MSG }!yD^:[ 5  
  DECLARE_MESSAGE_MAP() yc%E$g  
}; !%RJC,X  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); <.7I8B7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #nf%ojh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); QOh w  
BOOL InitHotkey(); mLk6!&zN  
BOOL UnInit(); XAULD]Q  
#endif Fb{`a[&  
>upXt?  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Aiks>Cyi23  
#include "stdafx.h" ~ut& U  
#include "hook.h" ug6f   
#include <windowsx.h> tp0!,ne*  
#ifdef _DEBUG K.iH  
#define new DEBUG_NEW Yr"!&\[oz  
#undef THIS_FILE q{De&Bu  
static char THIS_FILE[] = __FILE__; " ,aT<lw.  
#endif hA1gkEM2o  
#define MAX_KEY 100 {7![3`%7  
#define CTRLBIT 0x04 ?<yq 2`\4O  
#define ALTBIT 0x02 peTO-x^a-  
#define SHIFTBIT 0x01 0q>NE <L  
#pragma data_seg("shareddata") $kD`$L@U  
HHOOK hHook =NULL; dj y:  
UINT nHookCount =0; leb^,1/D6  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey MNf@HG  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT  fBWJ%W  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey [;IDTo!<>  
static int KeyCount =0; hDD~,/yVxs  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift mcz(,u}  
#pragma data_seg() c2\rjK   
HINSTANCE hins; =4M.QA@lI!  
void VerifyWindow(); n2y/zP>TC  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) {7Gx9(  
//{{AFX_MSG_MAP(CHookApp) l`M5'r]l  
// NOTE - the ClassWizard will add and remove mapping macros here. }KaCf,O  
// DO NOT EDIT what you see in these blocks of generated code! {Z?$Co^R  
//}}AFX_MSG_MAP X4P}aC  
END_MESSAGE_MAP() UU;-q_H6  
f?>-yMR|  
CHookApp::CHookApp() ;oY(I7  
{ s7UhC.>'@  
 // TODO: add construction code here, L`HH);Ozw  
 // Place all significant initialization in InitInstance BudWbZ5>Ep  
} Fyh?4!/.  
T) Zt'M  
CHookApp theApp; yjOu]K:X  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 1W}nYU  
{ SN[L4}{  
 BOOL bProcessed=FALSE; '!yS72{$2  
 if(HC_ACTION==nCode) GOZQ5m -  
 { q(jkit~`A  
  if((lParam&0xc0000000)==0xc0000000){// Key up FQ_%)Ty2  
   switch(wParam) O'!r]0Q  
   { "3Xv%U9@  
    case VK_MENU: rKy-u  
     MaskBits&=~ALTBIT; V$-~%7@>;9  
     break; 1|l)gfcP  
    case VK_CONTROL: I4o =6ts  
     MaskBits&=~CTRLBIT; ,>QMyI hv  
     break; *b6I%MZn  
    case VK_SHIFT: d Ik8TJ  
     MaskBits&=~SHIFTBIT; Xew1LPI  
     break; StdS$XW  
    default: //judge the key and send message O7'<I|aD  
     break; p29yaM  
   } MR?*GI's  
   for(int index=0;index<MAX_KEY;index++){ [B"dH-r7  
    if(hCallWnd[index]==NULL) ;Txv -lfS  
     continue; u6iU[5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 56bud3CVs  
    { =$)4:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6=G~6Qu  
     bProcessed=TRUE; 5M<' A=  
    } v ]/OAH6D  
   } nL":0!DTRD  
  } ]< s\V-y  
  else if((lParam&0xc000ffff)==1){ //Key down R%Ui6dCLo  
   switch(wParam) `FzYvd"N  
   { d4y9AE@k  
    case VK_MENU: FUyB"-<  
     MaskBits|=ALTBIT; f.aB?\"f6  
     break; Uw2,o|=O  
    case VK_CONTROL: #K :-Bys5v  
     MaskBits|=CTRLBIT; $S6HZG:N  
     break; kvW|=  
    case VK_SHIFT: X6LhM  
     MaskBits|=SHIFTBIT; q3AJwELXw  
     break; 9lZAa8Rxi  
    default: //judge the key and send message nOAJ9  
     break; <THZ2`tTK3  
   } d}{LM!s  
   for(int index=0;index<MAX_KEY;index++) Hhe{ +W@~  
   { =9qGEkd3  
    if(hCallWnd[index]==NULL) lC'{QUC  
     continue; QQg8+{>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *PSvHXNi  
    { V-KL%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); :jt;EzCLg%  
     bProcessed=TRUE; vU_d=T%$  
    } | ((1V^  
   } T~i%j@Q.6  
  } &=F-moDD  
  if(!bProcessed){ zb>f;[  
   for(int index=0;index<MAX_KEY;index++){ :]CzN^k(1c  
    if(hCallWnd[index]==NULL) [%j?.N  
     continue; "3{#d9Gs  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) > 63)z I  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >lD;0EN  
   } (O)\#%,@R  
  } Q00R<hu@F  
 } uipq=Yp.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Usa+b A  
} B ~fSMB6h  
n S_Ta  
BOOL InitHotkey() @~m=5C  
{ GVmC }>z  
 if(hHook!=NULL){ 0bMoUy*q  
  nHookCount++; G(U9rJ9  
  return TRUE; lLb:f6N  
 } v! 7s M  
 else _GVE^yW~z  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ?M*7@t@  
  if(hHook!=NULL) g M4Pj[W  
   nHookCount++; r4O|()  
  return (hHook!=NULL); IDy_L;'`*  
}  9R9__w;  
BOOL UnInit() Y3#Nux%  
{ L'zE<3O'3  
 if(nHookCount>1){ uije#cj#O  
  nHookCount--; ,:D=gQ@`  
  return TRUE; a}:A,t<6  
 } z]^+^c_  
 BOOL unhooked = UnhookWindowsHookEx(hHook); D Irgq|8  
 if(unhooked==TRUE){ HXQ e\r  
  nHookCount=0; `I5O4|K)  
  hHook=NULL; +c^_^Z$_4o  
 } s|Z:}W?{  
 return unhooked; PG{i,xq_B{  
} ?b||Cr  
=43I1&_   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) D`6iDi t  
{ s}6+8fE"  
 BOOL bAdded=FALSE; ze`1fO|%  
 for(int index=0;index<MAX_KEY;index++){ 6iG(C.b  
  if(hCallWnd[index]==0){ Zy^=fM  
   hCallWnd[index]=hWnd; 1EVfowIl  
   HotKey[index]=cKey; ^>C 11v  
   HotKeyMask[index]=cMask; = 96G8hlT  
   bAdded=TRUE; Zp?4uQ)[W  
   KeyCount++; 7ftR 4  
   break; EXuLSzQwv  
  } a:85L!~:l  
 } (+* ][|T  
 return bAdded; {P-xCmZ~Wt  
} GL1'Zo  
JPEIT  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) M\Se_  
{ PgMbMH  
 BOOL bRemoved=FALSE; z~,mRgc$B  
 for(int index=0;index<MAX_KEY;index++){ |6aJwe+*  
  if(hCallWnd[index]==hWnd){ tQWWgLM  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2d*_Qq1  
    hCallWnd[index]=NULL; Fh K&@@_  
    HotKey[index]=0; z v>Oh#  
    HotKeyMask[index]=0; >OV<_(S4  
    bRemoved=TRUE; +b^]Pz5  
    KeyCount--; NUCiY\td  
    break; hk%k(^ekU]  
   } Hou*lCA  
  } t8QRi!\=  
 } F|>05>8  
 return bRemoved; (Yv{{mIy  
} B MM--y@  
T-'~?[v  
void VerifyWindow() ow$q7uf  
{ kY"KD22a  
 for(int i=0;i<MAX_KEY;i++){ ]jyM@  
  if(hCallWnd!=NULL){ @Br {!#Wf  
   if(!IsWindow(hCallWnd)){ u:@U $:sZ  
    hCallWnd=NULL; Y25^]ON*\^  
    HotKey=0; ^T:gb]i'Qa  
    HotKeyMask=0; ?]c+j1 i  
    KeyCount--; 8V9 [a*9  
   } xACdZB(  
  } 7Y1GUIRa3  
 } wJe?t$ac?  
} %%%S"$t  
{T=52h=e  
BOOL CHookApp::InitInstance() fiVHRSX60  
{ jfD1  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); .h4\{|  
 hins=AfxGetInstanceHandle();  4*TmlY  
 InitHotkey(); qTT,U9]:  
 return CWinApp::InitInstance(); Tk*w3c"$  
} WF2NG;f=  
rAb&I"\ZY  
int CHookApp::ExitInstance() >O#grDXb  
{ 24u x  
 VerifyWindow(); iXFP5a>|  
 UnInit(); c pk^!@c  
 return CWinApp::ExitInstance(); 9'nH2,_  
} )0k']g5  
n2 {SV  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file :P$#MC  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 6.5wZN9<|  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ =>|C~@C?  
#if _MSC_VER > 1000 PFM' & ;V  
#pragma once (&[[46  
#endif // _MSC_VER > 1000 +H_MV=A^  
)55\4<ty  
class CCaptureDlg : public CDialog d--'Rn5  
{ pu+ur=5&  
 // Construction i%-Ld Ka}"  
 public: {^}0 G^  
  BOOL bTray; ]E3<UR  
  BOOL bRegistered; .$!{-v[  
  BOOL RegisterHotkey(); n((vY.NDV  
  UCHAR cKey; $bvJTuw  
  UCHAR cMask; ,lt8O.h-l  
  void DeleteIcon(); .&1C:>  
  void AddIcon(); 2 rN ,D(  
  UINT nCount; #aar9  
  void SaveBmp(); M6rc!K  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Qd &" BEs  
  // Dialog Data 9MY7a=5E~  
  //{{AFX_DATA(CCaptureDlg) L?5f+@0.  
  enum { IDD = IDD_CAPTURE_DIALOG }; \( )# e  
  CComboBox m_Key; [8XLK4e  
  BOOL m_bControl; ?kTWpXx"=  
  BOOL m_bAlt; HN6}R|IH  
  BOOL m_bShift; El- ? %  
  CString m_Path; e5?PkFV^a1  
  CString m_Number; a.@qGsIH  
  //}}AFX_DATA :7g=b%;  
  // ClassWizard generated virtual function overrides T6#CK  
  //{{AFX_VIRTUAL(CCaptureDlg) WC,+Cn e  
 public: `.%JjsD<  
  virtual BOOL PreTranslateMessage(MSG* pMsg); !ABiy6d  
 protected: rJJ[X4$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support vUA0FoOp  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Sv'y e  
  //}}AFX_VIRTUAL 5D Y\:AF  
  // Implementation W_`A"WdT.  
 protected: l@JSK ;  
  HICON m_hIcon; ]Mi.f3QlO6  
  // Generated message map functions h3* x[W  
  //{{AFX_MSG(CCaptureDlg) F_;DN: {  
  virtual BOOL OnInitDialog(); | ?yo 3  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); &a,OfSz  
  afx_msg void OnPaint();  \ %=9  
  afx_msg HCURSOR OnQueryDragIcon(); F {+`uG  
  virtual void OnCancel(); r?/A?DMe  
  afx_msg void OnAbout(); TUIk$U?/I  
  afx_msg void OnBrowse(); G:W>I=^DaR  
  afx_msg void OnChange(); 'heJ"k?  
 //}}AFX_MSG `J0i.0p  
 DECLARE_MESSAGE_MAP() ^|!I +  
}; c{+AJ8  
#endif }8-\A7T  
? "/ fPV-  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Iu@y(wyg  
#include "stdafx.h" -r7]S  
#include "Capture.h" bzN-*3YE=  
#include "CaptureDlg.h" A{eLl  
#include <windowsx.h> +rXF{@ l  
#pragma comment(lib,"hook.lib") E Y<8B3y  
#ifdef _DEBUG sP@X g;]  
#define new DEBUG_NEW Lw1EWN6}_&  
#undef THIS_FILE .|qK +Hnc  
static char THIS_FILE[] = __FILE__; h}`!(K^;3  
#endif P>ceeoYQuA  
#define IDM_SHELL WM_USER+1 H*^\h?s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); H( jXI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4mjgt<`  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Yc r3HLJy  
class CAboutDlg : public CDialog {c?JuV4q?  
{ lbdTQ6R  
 public: H9)m^ *  
  CAboutDlg(); O,2~"~kF  
  // Dialog Data i':i_kU  
  //{{AFX_DATA(CAboutDlg) gi/@ j  
  enum { IDD = IDD_ABOUTBOX }; B+d<F[ |  
  //}}AFX_DATA F>je4S;  
  // ClassWizard generated virtual function overrides |{r$jZeE  
  //{{AFX_VIRTUAL(CAboutDlg) A>`945|  
 protected: 51C2u)HE  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `:m!~  
  //}}AFX_VIRTUAL '_\;jFAM  
  // Implementation 6qWdd&1  
 protected: \c v?^AI  
  //{{AFX_MSG(CAboutDlg) {`=0 |oP}  
  //}}AFX_MSG 7uorQfR?  
  DECLARE_MESSAGE_MAP() |BT MJ:B  
}; vbx6I>\Y  
u]-_<YZ'B  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1n5(S<T  
{ @`opDu!  
 //{{AFX_DATA_INIT(CAboutDlg) :2 >hoAJJ  
 //}}AFX_DATA_INIT TGXa,A{  
} B vo5-P6XY  
>(w2GD?  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) |Xi%   
{ `p b5*h6r!  
 CDialog::DoDataExchange(pDX); RO;Bl:x4  
 //{{AFX_DATA_MAP(CAboutDlg) n<sd!xmqFx  
 //}}AFX_DATA_MAP ,;?S\V  
} =gfI!w  
\<Sv3xy&O  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) YJg,B\z}  
 //{{AFX_MSG_MAP(CAboutDlg) 0~wF3BgV  
 // No message handlers n+@F`]K e  
 //}}AFX_MSG_MAP (&|_quP7O  
END_MESSAGE_MAP() @E( 7V(m/  
HoV^Y6  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Oa;X +  
: CDialog(CCaptureDlg::IDD, pParent) EN{]Qb06A  
{ !Cgx.   
 //{{AFX_DATA_INIT(CCaptureDlg) " 96yp4v@  
  m_bControl = FALSE; D(p\0V  
  m_bAlt = FALSE; Jd\apBIf  
  m_bShift = FALSE; 9)xUA;Qw?z  
  m_Path = _T("c:\\"); ah @uUHB  
  m_Number = _T("0 picture captured."); :@W.K5  
  nCount=0; NNhL*C[_7  
  bRegistered=FALSE; G22NQ~w8  
  bTray=FALSE; Pq*s{  
 //}}AFX_DATA_INIT V.ht, ~l  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Zwcy4>8  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); >Vy>O &r  
} 21s4MagC  
dzK{ Z  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) `l2O?U-@  
{ QB.J,o*XD4  
 CDialog::DoDataExchange(pDX); CQel3Jtt.  
 //{{AFX_DATA_MAP(CCaptureDlg) du$|lxC  
  DDX_Control(pDX, IDC_KEY, m_Key); mk7&<M  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); /@AEJ][$  
  DDX_Check(pDX, IDC_ALT, m_bAlt); }X GEX:1K  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); r`)L ~/  
  DDX_Text(pDX, IDC_PATH, m_Path); q~CA0AR  
  DDX_Text(pDX, IDC_NUMBER, m_Number); JN^ &S  
 //}}AFX_DATA_MAP SN4Q))dAU  
} `%+ mO88o  
]E  =Iu  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ,+`61J3W  
//{{AFX_MSG_MAP(CCaptureDlg) (-]r~Ol^  
 ON_WM_SYSCOMMAND() q-nSLE+_;  
 ON_WM_PAINT() [I4ege>  
 ON_WM_QUERYDRAGICON() Kvsh  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) {G <kA(Lm  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) s yU9O&<  
 ON_BN_CLICKED(ID_CHANGE, OnChange) y/e 2l  
//}}AFX_MSG_MAP dz~co Z9  
END_MESSAGE_MAP() ,q(&)L$S  
b jAnaya  
BOOL CCaptureDlg::OnInitDialog() ThPE 0V  
{ ^pM+A6 XY  
 CDialog::OnInitDialog(); +<,gB $j  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); sr@j$G#uW5  
 ASSERT(IDM_ABOUTBOX < 0xF000); r{L4]|(utY  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *[=bR>  
 if (pSysMenu != NULL) "V{yi!D{<  
 { G:x*BH+  
  CString strAboutMenu; K)TrZ 2  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ~|wbP6</:-  
  if (!strAboutMenu.IsEmpty()) # :T-hRu  
  { pJN${  
   pSysMenu->AppendMenu(MF_SEPARATOR); 0$7.g!h?  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); VqL.iZ-  
  } +[SgO}sF  
 } 2pdvWWh3l  
 SetIcon(m_hIcon, TRUE); // Set big icon .>z][2oz  
 SetIcon(m_hIcon, FALSE); // Set small icon eIl]oC7*  
 m_Key.SetCurSel(0); xBu1Ak8w  
 RegisterHotkey(); XZw6Xtn  
 CMenu* pMenu=GetSystemMenu(FALSE); JdZ+Hp3.  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); P0 `Mdk371  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Xl@cHO=i  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); AoA!q>  
 return TRUE; // return TRUE unless you set the focus to a control WyP W*  
} 099sN"kf  
~=R SKyzt  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) > iE!m  
{ }I`a`0/  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) EUsI%p  
 { oK{ V7  
  CAboutDlg dlgAbout; UT}i0I9  
  dlgAbout.DoModal(); oD}uOC}FS{  
 } Kscd}f)yx?  
 else EGl^!.'  
 { "UwH\T4I  
  CDialog::OnSysCommand(nID, lParam); yV)la@c  
 } DcSnia62f  
} @ P|LLG'  
OFje+S  
void CCaptureDlg::OnPaint() 1Bxmm#  
{ ?eV4 SH  
 if (IsIconic()) +a^F\8H  
 { <AJ97MLcc  
  CPaintDC dc(this); // device context for painting tGB@$UmfU  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); HHqwq.zIy  
  // Center icon in client rectangle Gycm,Cy  
  int cxIcon = GetSystemMetrics(SM_CXICON); dg4vc][  
  int cyIcon = GetSystemMetrics(SM_CYICON); Vf(6!iRP@  
  CRect rect; Wu)>U  
  GetClientRect(&rect); R *F l8   
  int x = (rect.Width() - cxIcon + 1) / 2; jD7NblX  
  int y = (rect.Height() - cyIcon + 1) / 2; tpuYiL  
  // Draw the icon @29U@T  
  dc.DrawIcon(x, y, m_hIcon); |d6T/Uxo  
 } h$L"8#  
 else RmZ]" `  
 { mDZ*E!B  
  CDialog::OnPaint(); a1Qv@p^._b  
 } xeGb?DPu  
} \c^45<G2qA  
? `J[[",  
HCURSOR CCaptureDlg::OnQueryDragIcon() ~}Rj$%_  
{ r H~" 4  
 return (HCURSOR) m_hIcon; I@\OaUGr+  
} BC'llD  
s`>[F@N7.o  
void CCaptureDlg::OnCancel() -GLMmZJt  
{ 1#1 riM -  
 if(bTray) KD^N)&k^Kp  
  DeleteIcon(); ZoArQ(YFy  
  CDialog::OnCancel(); h;3cd0  
} 3j3N!T9  
?.Pg\ur  
void CCaptureDlg::OnAbout() 5E notp[  
{ | [ >UH  
 CAboutDlg dlg; }<'5 z qS  
 dlg.DoModal(); Ks}Xgc\  
} ,-z9 #t  
KF4PJi;*  
void CCaptureDlg::OnBrowse() z5TuGY b<  
{ %6_AM  
 CString str; qTQBt}  
 BROWSEINFO bi; Z(!00^  
 char name[MAX_PATH]; o6//IOZ  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 3MRc 4UlB  
 bi.hwndOwner=GetSafeHwnd(); Y3O#Q)-j$  
 bi.pszDisplayName=name; -kbg\,PW  
 bi.lpszTitle="Select folder"; [LRLJ_~g5  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; M`S0u~#tI  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); %Z*sU/^  
 if(idl==NULL) bu51$s?B  
  return; V\6]n2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); t]X w{)T  
 str.ReleaseBuffer(); 2<}NB?f`N  
 m_Path=str; n9s iX  
 if(str.GetAt(str.GetLength()-1)!='\\') j!3 Gz  
  m_Path+="\\"; Uo2GK3nT  
 UpdateData(FALSE); ;`6^6p\p  
} |2KAo!PI  
2YDM9`5xs\  
void CCaptureDlg::SaveBmp() U)3DQ6T99  
{ fNrgdfo  
 CDC dc; NssELMtF!g  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); tr7<]Hm:  
 CBitmap bm; i E CrI3s  
 int Width=GetSystemMetrics(SM_CXSCREEN); ~/*MY  
 int Height=GetSystemMetrics(SM_CYSCREEN); g(4xC7xK6  
 bm.CreateCompatibleBitmap(&dc,Width,Height); gJM`[x`T  
 CDC tdc; Y/7 $1k  
 tdc.CreateCompatibleDC(&dc); H@l}WihW  
 CBitmap*pOld=tdc.SelectObject(&bm); H9CS*|q6r  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); !A%<#Gjt  
 tdc.SelectObject(pOld); rylzcN9RM$  
 BITMAP btm; ciMzf$+G$  
 bm.GetBitmap(&btm); K#"O a h  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; HF(KN{0.B  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 3d|9t9v  
 BITMAPINFOHEADER bih; YQY%M>F@d%  
 bih.biBitCount=btm.bmBitsPixel; 3$X'Y]5a  
 bih.biClrImportant=0; D::rGB?.b  
 bih.biClrUsed=0; G\(|N9^:  
 bih.biCompression=0; 8(* [Fe9  
 bih.biHeight=btm.bmHeight; +!|9hF'  
 bih.biPlanes=1; NQ6sGL  
 bih.biSize=sizeof(BITMAPINFOHEADER); k-}b{  
 bih.biSizeImage=size; 8Ac:_Zg  
 bih.biWidth=btm.bmWidth; sM9+dh  
 bih.biXPelsPerMeter=0; ^`G}gWBx}w  
 bih.biYPelsPerMeter=0; l]5w$dded~  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); O?|gp<=d  
 static int filecount=0; _8E/) M  
 CString name; &%-73nYw  
 name.Format("pict%04d.bmp",filecount++); N ,z6y5Lu  
 name=m_Path+name; Dtj&W<NXo  
 BITMAPFILEHEADER bfh; Jkek-m  
 bfh.bfReserved1=bfh.bfReserved2=0; pxa(  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 4]E3c AJ  
 bfh.bfSize=54+size; qT^I?g"!  
 bfh.bfOffBits=54; Ng_!zrx04  
 CFile bf; ,2W8=ON  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ rvw)-=qR[  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 53[~bwD  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); :ijAqfX  
  bf.WriteHuge(lpData,size); " W|%~h  
  bf.Close(); ~sXcnxLz  
  nCount++; D"D<+ ;S#  
 } /Sh#_\x  
 GlobalFreePtr(lpData); 6AhM=C  
 if(nCount==1)  E@b(1@  
  m_Number.Format("%d picture captured.",nCount); 15sp|$&`  
 else /~<@*-'  
  m_Number.Format("%d pictures captured.",nCount); |)*fRL,  
  UpdateData(FALSE); q*9!,!e  
} aca=yDs2  
J Px~VnE%%  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) *I0T{~  
{ y_?Me]  
 if(pMsg -> message == WM_KEYDOWN) j?+X\PtQ  
 { ?[ lV-  
  if(pMsg -> wParam == VK_ESCAPE) <.? jc%  
   return TRUE; `V04\05  
  if(pMsg -> wParam == VK_RETURN) >m$ 1+30X  
   return TRUE; )h)]SF}  
 } (}2~<   
 return CDialog::PreTranslateMessage(pMsg); % S os  
} <q@a~'Ai?!  
sL$:"=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) )<tI!I][j  
{ S@/IQR  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ a5 TioQ  
  SaveBmp(); ~5oPpTAe  
  return FALSE; G2T|RT $_K  
} n~V ]Z  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ uu>Pkfo  
 CMenu pop; @8I4[TE  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;N?]eM}yf  
 CMenu*pMenu=pop.GetSubMenu(0); p|p l  
 pMenu->SetDefaultItem(ID_EXITICON); ^\S~?0^m  
 CPoint pt; Ug<#en  
 GetCursorPos(&pt); (:> ,u*x%  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Bn &Ws  
 if(id==ID_EXITICON) q1KZ5G)6GJ  
  DeleteIcon(); \}|o1Xh2  
 else if(id==ID_EXIT) Sxh]R+Xb  
  OnCancel(); Iepsz  
 return FALSE; jJPGrkr  
} 4.5|2 \[  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); gK'1ZLdZ2  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) OD!& .%  
 AddIcon(); <d$x.in  
 return res; XcUwr  
} VG ;kPzze  
"[ZB+-|[0  
void CCaptureDlg::AddIcon() /x p|  
{ }xh$T'M8  
 NOTIFYICONDATA data; oc>{?.^  
 data.cbSize=sizeof(NOTIFYICONDATA); ,1+y/{S  
 CString tip; )`O~f_pIC  
 tip.LoadString(IDS_ICONTIP); .0`m\~L  
 data.hIcon=GetIcon(0); !'9Feoez  
 data.hWnd=GetSafeHwnd(); 9~/J35  
 strcpy(data.szTip,tip); <"my^  
 data.uCallbackMessage=IDM_SHELL; R[hzMU}KB  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 4J/}]Dr5  
 data.uID=98; 7\s"o&G  
 Shell_NotifyIcon(NIM_ADD,&data); ?b>,9A.Z  
 ShowWindow(SW_HIDE); IHv[v*4:  
 bTray=TRUE; 9^#c| 0T  
} 7%|~>  
6"&6 `f  
void CCaptureDlg::DeleteIcon() "ozr+:#\  
{ t^G"f;Ra+  
 NOTIFYICONDATA data; cmU1!2.1E  
 data.cbSize=sizeof(NOTIFYICONDATA); 1oW ED*B  
 data.hWnd=GetSafeHwnd(); heC/\@B  
 data.uID=98; $m-2Hh qZ  
 Shell_NotifyIcon(NIM_DELETE,&data); (Hb:?(  
 ShowWindow(SW_SHOW); 4i(JZN?  
 SetForegroundWindow(); UKT%13CO4U  
 ShowWindow(SW_SHOWNORMAL); aGtf z)  
 bTray=FALSE; oF1,QQ^dg  
} os:A]  
Sp;G'*g  
void CCaptureDlg::OnChange() Vg>dI&O  
{ ic#`N0s?  
 RegisterHotkey(); VKG&Y_7N  
} ijK"^4i  
'R'*kxf  
BOOL CCaptureDlg::RegisterHotkey() R?"q]af~  
{ SVh 7zh  
 UpdateData(); \kMefU  
 UCHAR mask=0; !W}9no  
 UCHAR key=0; "AsKlKz{B  
 if(m_bControl) # Oc] @  
  mask|=4; j2StXq3  
 if(m_bAlt) 7` zHX&-W  
  mask|=2; pS'FI@.'{  
 if(m_bShift) ogHCt{'  
  mask|=1; YA_c N5p/@  
  key=Key_Table[m_Key.GetCurSel()]; 5A3xVN=  
 if(bRegistered){ 26I_YL,S  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); g4=pnK8  
  bRegistered=FALSE; /-_h1.!   
 } xy/`ZS2WPq  
 cMask=mask; SwTL|+u  
 cKey=key; }J:U=HJ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); KyYMfC  
 return bRegistered; gM u"2I5  
} .*Ct bGw  
$j5K8Ad  
  四、小结 emqZztccZ  
6z#acE1)M  
  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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