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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: k%~;mu"4}  
  f:\)! &W  
  一、实现方法 [n/c7Pe  
/ S' +  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: S'|PA7a}h  
n.9k5r@  
#pragma data_seg("shareddata") g`'!Vgd?M[  
HHOOK hHook =NULL; //钩子句柄 W"@'}y  
UINT nHookCount =0; //挂接的程序数目 ~fD\=- S1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 %,vq@..^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 zdPJ>PNU  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey F5:xrcyC  
static int KeyCount =0; Lb Jf5xdi  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 2Cy,#X%j>  
#pragma data_seg() e)?}2  
+$L}B-F  
  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。 $t& o(]m  
p+?`ru  
  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: l:@=9Fp>  
,\ 1X\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 30WOH 'n  
cKey,UCHAR cMask) 9teP4H}m  
{ 0U% tjYk(  
 BOOL bAdded=FALSE; D`G;C  
 for(int index=0;index<MAX_KEY;index++){ N}nE9z5  
  if(hCallWnd[index]==0){ ?0dmw?i  
   hCallWnd[index]=hWnd; "__)RHH:8  
   HotKey[index]=cKey; #]1 jvB  
   HotKeyMask[index]=cMask; Ump Hae  
   bAdded=TRUE; %`s#p` Ol1  
   KeyCount++; `,~'T [  
   break; d`V.i6u  
  }  #9}1Lo>  
 } z0\ $# r^I  
 return bAdded; tQNc+>7k+u  
} 9C?SEbC  
//删除热键 b 4^O=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?;UR9f|!  
{ Q hRz57'  
 BOOL bRemoved=FALSE; gzhIOeY  
 for(int index=0;index<MAX_KEY;index++){ & .1-6  
  if(hCallWnd[index]==hWnd){ S)ipkuj X  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <L8FI78[*  
    hCallWnd[index]=NULL; i75\<X  
    HotKey[index]=0; e%ro7~  
    HotKeyMask[index]=0; arR<!y7  
    bRemoved=TRUE; y,rdyt  
    KeyCount--; ^zT=qB l  
    break; |9 5K  
   } w2b(,w  
  } (5Q<xJ  
 } RgH 6l2  
 return bRemoved; -a|b.p  
} ua=7YG  
ul_E{v  
$FT6c@&y  
  DLL中的钩子函数如下: /,~]1&?}1  
E83$(6z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]vR Ol.  
{ T[e+iv<8j  
 BOOL bProcessed=FALSE; U:7w8$_  
 if(HC_ACTION==nCode) ;,]4A{|  
 { ,ko#z}Z4r,  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 $;=^|I4E  
   switch(wParam) 1Z_w2D*  
   {  F ]D^e{y  
    case VK_MENU: 5ad@}7&  
     MaskBits&=~ALTBIT; %}N01P|X>  
     break; i4>M  
    case VK_CONTROL: '6\w4J(  
     MaskBits&=~CTRLBIT; .%J<zqk-  
     break; x{!+ 4W;S  
    case VK_SHIFT: Rq2bj_j  
     MaskBits&=~SHIFTBIT; 4@F8-V3q4  
     break; ^FNju/b  
    default: //judge the key and send message ZB$yEW]]~  
     break; IY!.j5q8  
   } U3]/ NV*   
   for(int index=0;index<MAX_KEY;index++){ 4Hyp]07  
    if(hCallWnd[index]==NULL) U74L:&y LI  
     continue; m7A3i<6p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F&7Z(  
    { e 5(|9*t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )~$ejS  
     bProcessed=TRUE; @HI@PZ>  
    } ! B`  
   } |Om][z  
  } suaP'0  
  else if((lParam&0xc000ffff)==1){ //有键按下 uj%]+Llxv  
   switch(wParam) KDP& I J  
   { s^)(.e_  
    case VK_MENU:  %>zG;4  
     MaskBits|=ALTBIT; Oi C|~8  
     break; N1y,~Z  
    case VK_CONTROL: I WT|dA >  
     MaskBits|=CTRLBIT; Ai 8+U)  
     break; aRn""3[  
    case VK_SHIFT: fCs{%-6cP  
     MaskBits|=SHIFTBIT; $b^niL  
     break; -; d{}F  
    default: //judge the key and send message 7?_g m>]a  
     break; i 28TH Jh  
   } K",Xe>  
   for(int index=0;index<MAX_KEY;index++){ v?nGAn  
    if(hCallWnd[index]==NULL) ,B x0  
     continue; =b)!l9TX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6 P(jc  
    { ) .V,zmI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); X?r$o>db  
     bProcessed=TRUE; e&(Wn2)o  
    } qgWsf-di=  
   } if1)AE-  
  } Mz) r'  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 +WR'\15u   
   for(int index=0;index<MAX_KEY;index++){ :zfMRg  
    if(hCallWnd[index]==NULL) VyIJ)F.c  
     continue; K-.%1d@$y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Q0 ezeo  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0iMfyW:  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 %[L/JJbP&Z  
   } & R<K>i  
  } HDE5Mg "  
 } i(# Fjp  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); hf)R PG&  
} r|bGn#^  
#{)mr [c|  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 1csbuR?  
o {q8An)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); WwKpZ67$R  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); JNvgUb'U  
n0':6*oGW  
  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: Gh3f^PWnc  
`09[25?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) CRzLyiRvU&  
{ 5Tidb$L;Du  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) fo9V&NE  
 { H\<PGC"_Y  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 |`I9K#w3  
  SaveBmp(); }U%E-:  
  return FALSE; 3][   
 } us:v/WTQ  
 …… //其它处理及默认处理 2of+KI:  
} Dn>C :YS`  
0(uba3z  
-s91/|n  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 !.q#X^@>L  
wv%UsfD  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ph ~#{B(\  
d(Yuz#Qcrh  
  二、编程步骤 IMy!8$\u  
"zIQ(|TL?d  
  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"; q.ppYXJUXi  
`+Mva  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; !83 N#Y_Mz  
UrS%t>6k  
  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; ,mD$h?g  
PDh!B _+  
  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; 2:[G4  
Sc]h^B^7  
  5、 添加代码,编译运行程序。 @Js@\)P79  
FT gt$I  
三、程序代码  )Z:maz  
MLDAr dvK  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Zc9S[ivq  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) +sd':vE  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ U!lWP#m  
#if _MSC_VER > 1000 R~d Wblv  
#pragma once &b19s=Z,  
#endif // _MSC_VER > 1000 XlwyD  
#ifndef __AFXWIN_H__ 4`"Q!T_'  
#error include 'stdafx.h' before including this file for PCH :|ytw= 3>  
#endif /hGu42YG  
#include "resource.h" // main symbols 1Zp^X:(  
class CHookApp : public CWinApp cgQ2Wo7tCq  
{ V4gvKWc  
 public: qyBo|AQ5  
  CHookApp(); * ^\u%Ir"  
  // Overrides Vgj[m4l  
  // ClassWizard generated virtual function overrides sR$/z9w  
  //{{AFX_VIRTUAL(CHookApp) aU] nh. a  
 public: &e4EZ  
  virtual BOOL InitInstance(); V#DNcF~v]f  
  virtual int ExitInstance(); dpcv'cRfw  
  //}}AFX_VIRTUAL "[ >ql1t{b  
  //{{AFX_MSG(CHookApp) Op iVQr:  
  // NOTE - the ClassWizard will add and remove member functions here. H]0(GLvH  
  // DO NOT EDIT what you see in these blocks of generated code !  ixF  
  //}}AFX_MSG 0n)UvJ  
  DECLARE_MESSAGE_MAP() lR]SGdY  
}; 7<F{a"5P  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 1~*JenV-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %bTXu1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *&F~<HC2+  
BOOL InitHotkey(); QnH~' k  
BOOL UnInit(); I9cZZ`vs  
#endif 8{-bG8L> 5  
B o[aiT  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. G4f%=Z  
#include "stdafx.h" [sG!|@r  
#include "hook.h" kx[h41|n  
#include <windowsx.h> *C^`+*}OE$  
#ifdef _DEBUG k/%n7 ;1  
#define new DEBUG_NEW f87lm*wZ  
#undef THIS_FILE YYd!/@|N5  
static char THIS_FILE[] = __FILE__; Snas:#B!  
#endif g6q67m<h  
#define MAX_KEY 100  ] 2lh J  
#define CTRLBIT 0x04 2{-'`l fM%  
#define ALTBIT 0x02 y]%Io]!d  
#define SHIFTBIT 0x01 )G$0:-J-  
#pragma data_seg("shareddata") M7AUY#)  
HHOOK hHook =NULL; !r_2b! dy  
UINT nHookCount =0; t. kOR<  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey R<8!lQ4s  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT OQsF$% *   
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey >Co5_sCe  
static int KeyCount =0; GEfTs[  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift WcE/,<^*  
#pragma data_seg() N1z:9=(I  
HINSTANCE hins; =a./HCF  
void VerifyWindow(); 7Dx <Sr!  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) kM@heFJb.  
//{{AFX_MSG_MAP(CHookApp) z_ia3k<  
// NOTE - the ClassWizard will add and remove mapping macros here. 6y)NH 8l7  
// DO NOT EDIT what you see in these blocks of generated code! 5!d'RBO   
//}}AFX_MSG_MAP O8w|!$Q.  
END_MESSAGE_MAP() G9a6 $K)b  
B3&`/{u  
CHookApp::CHookApp() Ha20g/ UN.  
{ ^e WD4Vp|4  
 // TODO: add construction code here, K<ok1g'0  
 // Place all significant initialization in InitInstance NT [~AK9M  
} LD)P. f  
8u#2M8.5E  
CHookApp theApp; [e`6gGO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Fop'm))C8  
{ . ,n>#lL  
 BOOL bProcessed=FALSE; wO ?A/s  
 if(HC_ACTION==nCode) ,qO2D_  
 { %$SO9PY  
  if((lParam&0xc0000000)==0xc0000000){// Key up [NIaWI,>  
   switch(wParam) i;}mIsNBY  
   { 0N>R!  
    case VK_MENU: l)( 3]  
     MaskBits&=~ALTBIT; XVkCYh4,  
     break; Kh2!c+Mw  
    case VK_CONTROL: );5H<[  
     MaskBits&=~CTRLBIT; RL3G7;X  
     break; la[>C:8IG  
    case VK_SHIFT: A"~4|`W  
     MaskBits&=~SHIFTBIT; {Zy)p%j8  
     break; MFm2p?zPm  
    default: //judge the key and send message <ULydBom  
     break; 'z3I*[!  
   } +OC~y:  
   for(int index=0;index<MAX_KEY;index++){ q`^ T7  
    if(hCallWnd[index]==NULL)  q<Zza  
     continue; k'JfXrW<!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =-|,v*  
    { |jE0H!j  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8P3"$2q  
     bProcessed=TRUE; =F"vL  
    } z;ko )  
   } eUE(vn#  
  } ,fW%Qv  
  else if((lParam&0xc000ffff)==1){ //Key down V`XtGTx  
   switch(wParam) +LsACSB  
   { JE.s?k  
    case VK_MENU: &x<y4ORH|  
     MaskBits|=ALTBIT; &F#K=R| .j  
     break; x C+TO  
    case VK_CONTROL: 6E@qZvQ  
     MaskBits|=CTRLBIT; &a bR}J[  
     break; }IGoPCV|  
    case VK_SHIFT: VgyY7INx9  
     MaskBits|=SHIFTBIT; <m X EX`?  
     break; v)J(@>CZ[  
    default: //judge the key and send message \t^h|<`  
     break; ~V6wcXd  
   } n(tx'&U"R  
   for(int index=0;index<MAX_KEY;index++) !U8n=A#,-  
   { >crFIkOJ  
    if(hCallWnd[index]==NULL) 24Uvi:B?~  
     continue; 5|0}   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UCVdR<<Z  
    { #1oyRD-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); n!$zO{P  
     bProcessed=TRUE; @J UCXm  
    } #cy;((zuB  
   } NANgV~Y&  
  } U/l3C(bc!  
  if(!bProcessed){ sw$$I~21  
   for(int index=0;index<MAX_KEY;index++){ Ty;P`Uv]r  
    if(hCallWnd[index]==NULL) I$w:qS&:  
     continue; Iu|4QE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) X/' t1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); w=feXA3-S  
   } /@QPJ~%8Ud  
  } {kNV|E  
 } N(=Z4Nk5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); f*46,` x  
} %UokR"  
!)$e+o^W  
BOOL InitHotkey() @\s*f7  
{ G24 Ov&H  
 if(hHook!=NULL){ 7/b\NLeJ'  
  nHookCount++; )LDBvpJyQ  
  return TRUE; ee\QK,QV  
 } #$0*Gd-N  
 else -"~XI~a@Wo  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); {7Q)2NC  
  if(hHook!=NULL) ~D\zz }l  
   nHookCount++; yeqH eZ  
  return (hHook!=NULL); ! n13B  
} 5~GH*!h%;  
BOOL UnInit() ,zVS}!jRhy  
{ "cDMFu  
 if(nHookCount>1){ 5e}adHjM  
  nHookCount--; q)PLc{NO  
  return TRUE; ^LAnR>mz^r  
 } &Xh_`*]ox  
 BOOL unhooked = UnhookWindowsHookEx(hHook); &.1qixXIr  
 if(unhooked==TRUE){ N/6! |F  
  nHookCount=0; $QB/n63  
  hHook=NULL; <kOdd)X  
 } PQJw"[N/YM  
 return unhooked; &5d~ODO  
} ;(r,;S_`0  
6%L#FSI  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !j%MN{#a  
{ ^bk:g}o  
 BOOL bAdded=FALSE; Fv$oXg/  
 for(int index=0;index<MAX_KEY;index++){ :erfs}I  
  if(hCallWnd[index]==0){ MmQ"z_v  
   hCallWnd[index]=hWnd; 7 F> a&r  
   HotKey[index]=cKey; K;j0cxl  
   HotKeyMask[index]=cMask; 45A|KaVpg  
   bAdded=TRUE; GW,RE\Q:  
   KeyCount++; <\`qRz0/  
   break; "el}9OitC  
  } ~1:_w ni  
 } Xb2.t^ ]f  
 return bAdded; 7.FD16  
} _?v&\j  
!q!5D`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tE WolO[\  
{ 7A"v:e  
 BOOL bRemoved=FALSE; z9Nial`p  
 for(int index=0;index<MAX_KEY;index++){ 4@r76v}{  
  if(hCallWnd[index]==hWnd){ G3dA`3  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ w8}jmpnI  
    hCallWnd[index]=NULL; )m_q2xV  
    HotKey[index]=0; |'qvq/#^  
    HotKeyMask[index]=0; wQX18aF/#d  
    bRemoved=TRUE; ~CuJ$(9Y  
    KeyCount--; R4vf  
    break; YHzP/&0  
   } (tvfF0~  
  } (lg~}Jwq  
 } ~@mNR^W-W  
 return bRemoved; 1+ 9!W  
} ]FEDAGu  
Q8D#kAYw  
void VerifyWindow() oy\U\#k   
{ .<4U2h  
 for(int i=0;i<MAX_KEY;i++){ Qz4Do6#y  
  if(hCallWnd!=NULL){ rT(b t~Z  
   if(!IsWindow(hCallWnd)){ yb6gYN  
    hCallWnd=NULL; X wIKpr8  
    HotKey=0; <f#pS[A  
    HotKeyMask=0; z1nKj\AM2  
    KeyCount--; tUi@'%>=5  
   } XaF;IS@A  
  } moRo>bvN~  
 } ?7uK:'8  
} J p)I9k,Ez  
*i>hFNLdOM  
BOOL CHookApp::InitInstance() NA=m<n#  
{ 4*'ZabDD  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); i}5M'~ F  
 hins=AfxGetInstanceHandle(); apjoIO-<  
 InitHotkey(); hc*tQ2  
 return CWinApp::InitInstance(); 2Mu@P8O&  
} $Y M(NC  
C#n.hgo>I  
int CHookApp::ExitInstance() tMH 2  
{ SP"t2LTP  
 VerifyWindow(); *Hz]<b?  
 UnInit(); fd$nAE  
 return CWinApp::ExitInstance(); @MP;/o+  
} *k@D4F ruP  
+GncQs y  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file F^.~37= @  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) k)9+;bKQQ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 3  $a;  
#if _MSC_VER > 1000 1`GW>ZKv  
#pragma once DE+k'8\T  
#endif // _MSC_VER > 1000 !P3y+;S  
sQ.t3a3m  
class CCaptureDlg : public CDialog 57KrDxE}  
{ yz"hU  
 // Construction 5mX^{V&^  
 public: qM<CBcON  
  BOOL bTray; m 48Ab`  
  BOOL bRegistered; + w'q5/`  
  BOOL RegisterHotkey(); 8jY<S+[o  
  UCHAR cKey; L+~XW'P?  
  UCHAR cMask; oqo7Ge2  
  void DeleteIcon(); jq%}=-%KE  
  void AddIcon(); |w{C!Q8l  
  UINT nCount; CB#B!;I8v  
  void SaveBmp(); ]k8f1F  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor f@2F!  
  // Dialog Data 3$S~!fh  
  //{{AFX_DATA(CCaptureDlg) ZW4$Ks2]Y  
  enum { IDD = IDD_CAPTURE_DIALOG }; a(kY,<}  
  CComboBox m_Key; v 6s]X*l?  
  BOOL m_bControl; Rg^ps  
  BOOL m_bAlt; ;iW>i8  
  BOOL m_bShift; hj}PL  
  CString m_Path; OF2 W UcQ  
  CString m_Number; a"`> J!  
  //}}AFX_DATA WL?qulC}h1  
  // ClassWizard generated virtual function overrides }0?XF/e(R  
  //{{AFX_VIRTUAL(CCaptureDlg) c dWg_WBC  
 public: r'4Dj&9Ac  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Ww"]3  
 protected: qeb}~FL"o  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support N<b~,[yCd>  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Lrmhr3 w5  
  //}}AFX_VIRTUAL AiB]A}  
  // Implementation yy+:x/(N[  
 protected: &*74 5,e  
  HICON m_hIcon; o=6 <?v7  
  // Generated message map functions e]5NA?2j  
  //{{AFX_MSG(CCaptureDlg) ^$X|Lq  
  virtual BOOL OnInitDialog(); z,bK.KFSs  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ym+Ezb#o  
  afx_msg void OnPaint(); j#xGB]  
  afx_msg HCURSOR OnQueryDragIcon(); "dT"6,  
  virtual void OnCancel(); m2P&DdN[  
  afx_msg void OnAbout(); $f%om)  
  afx_msg void OnBrowse(); 'rTJ*1i  
  afx_msg void OnChange(); GaV}@Q  
 //}}AFX_MSG qzEv!?)a  
 DECLARE_MESSAGE_MAP() &;~?\>?I  
}; i[ >U#5  
#endif 7dv!  
3 NFo=Z8  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file y` {|D*  
#include "stdafx.h" iXq*EZb"R  
#include "Capture.h" *Q)-"]O(k  
#include "CaptureDlg.h" %'X~9Pvi  
#include <windowsx.h> r*dNta<  
#pragma comment(lib,"hook.lib") wWSo+40  
#ifdef _DEBUG 1xu~@v 60  
#define new DEBUG_NEW ]s!id[j  
#undef THIS_FILE 9 4^b"hU  
static char THIS_FILE[] = __FILE__; 8]oolA:^4s  
#endif "0,FB4L[U5  
#define IDM_SHELL WM_USER+1 c2Exga_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ) iZU\2L  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c&N;r|N  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; IRueq @4  
class CAboutDlg : public CDialog g5RH:]DV  
{ KMK8jJ  
 public: ve:Oe{Ie{  
  CAboutDlg(); _]-4UA-  
  // Dialog Data 3,K\ZUU.,  
  //{{AFX_DATA(CAboutDlg) A7,%'.k  
  enum { IDD = IDD_ABOUTBOX }; BzS\p3&  
  //}}AFX_DATA s 0_*^cZ  
  // ClassWizard generated virtual function overrides (> _Lb  
  //{{AFX_VIRTUAL(CAboutDlg) |rG)Q0H,  
 protected: !dUdz7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support v~yw-}fk%  
  //}}AFX_VIRTUAL H^54o$5  
  // Implementation KVh#"]<WV  
 protected: \.}ZvM$  
  //{{AFX_MSG(CAboutDlg) %H;}+U]Z  
  //}}AFX_MSG 8a&c=9  
  DECLARE_MESSAGE_MAP() |a a\t  
}; K&RIF]0#G  
4HR36=E6  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ' Ttsscv  
{ ![nL/  
 //{{AFX_DATA_INIT(CAboutDlg) S;jD@j\t&  
 //}}AFX_DATA_INIT tv`b##  
} l($ 8H AJ  
tC(MaI  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) p2k`)=iX  
{ DA04llX~  
 CDialog::DoDataExchange(pDX); LokH4A17U  
 //{{AFX_DATA_MAP(CAboutDlg) <:NahxIlu  
 //}}AFX_DATA_MAP ?{jey_]M  
} *v]s&$WyO  
g4W/T  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 97$Q?a8S@  
 //{{AFX_MSG_MAP(CAboutDlg) }mzd23^W>P  
 // No message handlers ?Z_T3/ f  
 //}}AFX_MSG_MAP fQ~TZ:UrU  
END_MESSAGE_MAP() \HkBp& bqK  
l qwy5#  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +/l@o u'  
: CDialog(CCaptureDlg::IDD, pParent) _hJdC|/   
{ 9P)!v.,T/  
 //{{AFX_DATA_INIT(CCaptureDlg) g1}:;VG=  
  m_bControl = FALSE; (_8.gS[  
  m_bAlt = FALSE; #z _<{' P"  
  m_bShift = FALSE; x;$ESPPg  
  m_Path = _T("c:\\"); M:/(~X{?  
  m_Number = _T("0 picture captured."); /e[m;+9^&  
  nCount=0; CLk,]kA'r  
  bRegistered=FALSE; \Vroz=IT:  
  bTray=FALSE; X7AxI\h  
 //}}AFX_DATA_INIT Dr:M~r'6  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ACi,$Uq6R  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); hczDu8  
} P+ CdqOL  
Maq`Or|4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Ez"*',(  
{ Y]KHCY  
 CDialog::DoDataExchange(pDX); `e~i<Pi  
 //{{AFX_DATA_MAP(CCaptureDlg) [@5cYeW3.  
  DDX_Control(pDX, IDC_KEY, m_Key); ZS wuEX  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); {9-9!jN{"  
  DDX_Check(pDX, IDC_ALT, m_bAlt); A%?c1`ZxF  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 'I+S5![<  
  DDX_Text(pDX, IDC_PATH, m_Path); 'W4B  
  DDX_Text(pDX, IDC_NUMBER, m_Number); t-o,iaPG3  
 //}}AFX_DATA_MAP t&Eiz H$  
} 4H%#Sn#L^!  
|aAyWK  S  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) &M<"Fmn  
//{{AFX_MSG_MAP(CCaptureDlg) TWGn: mi  
 ON_WM_SYSCOMMAND() ~3M8"}X;L  
 ON_WM_PAINT() {6GX ?aw'  
 ON_WM_QUERYDRAGICON() az:}RE3o  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 8/(}Wet  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >l><d!hw  
 ON_BN_CLICKED(ID_CHANGE, OnChange) wdfbl_`T  
//}}AFX_MSG_MAP iQ(j_i'+!I  
END_MESSAGE_MAP() k}qQG}hB  
1.k=ji$D0  
BOOL CCaptureDlg::OnInitDialog() |9\i+)C  
{ k ,ldi  
 CDialog::OnInitDialog(); axph]o@ y@  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); s>I]_W)Pt  
 ASSERT(IDM_ABOUTBOX < 0xF000); $[?N^   
 CMenu* pSysMenu = GetSystemMenu(FALSE); /<n7 iIK)  
 if (pSysMenu != NULL) M>Tg$^lm  
 { }2LWDQ;po  
  CString strAboutMenu; % &&)[  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Y'~O_coG  
  if (!strAboutMenu.IsEmpty()) !j`<iPI7B  
  { UkpTK8>&  
   pSysMenu->AppendMenu(MF_SEPARATOR); *]NfT}}  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); "_\"S  
  } fdX|t "oz  
 } ][tR=Y#&y5  
 SetIcon(m_hIcon, TRUE); // Set big icon hU-FSdR  
 SetIcon(m_hIcon, FALSE); // Set small icon `|>]P"9yp  
 m_Key.SetCurSel(0); Hzm_o>^KC  
 RegisterHotkey(); Uq_lT,  
 CMenu* pMenu=GetSystemMenu(FALSE); iKV|~7nwO  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ga/zt-&  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Zv!XNc!"$y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ;`LG WT-<F  
 return TRUE; // return TRUE unless you set the focus to a control ,$ /Ld76U  
} ?%$O7_ThvA  
+aL  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;22?-F^  
{ 3IQI={:k|D  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) }xt^}:D  
 { ?!U.o1  
  CAboutDlg dlgAbout; C]8w[)d[`;  
  dlgAbout.DoModal(); <=GZm}/]N  
 } 0$c(<+D  
 else @O'NJh{D`  
 { U)Hc 7% e  
  CDialog::OnSysCommand(nID, lParam); X>yDj]*4P  
 } )Jk$j  
} "5<!   
n nAtXVy  
void CCaptureDlg::OnPaint() 035jU'  
{ keRLai7h  
 if (IsIconic()) o*/;Zp==  
 { 7F0J*M  
  CPaintDC dc(this); // device context for painting ,'HjL:r  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); RHn3\N  
  // Center icon in client rectangle M0xhcU_  
  int cxIcon = GetSystemMetrics(SM_CXICON); G.<0^q,  
  int cyIcon = GetSystemMetrics(SM_CYICON); LYL_Ah'=  
  CRect rect; XZ]ji9'  
  GetClientRect(&rect); !;(Wm6~*ad  
  int x = (rect.Width() - cxIcon + 1) / 2; ()Kaxcs?+  
  int y = (rect.Height() - cyIcon + 1) / 2; kN1R8|pv  
  // Draw the icon "*D9.LyM  
  dc.DrawIcon(x, y, m_hIcon); {+_p?8X  
 } g$#A'Du  
 else ~mt{j7  
 { 48^C+#Jbc  
  CDialog::OnPaint(); Vf~-v$YI  
 } O.X;w<F/V  
} ;@ixrj0u  
rZpsC}C'  
HCURSOR CCaptureDlg::OnQueryDragIcon() ],0I`!\  
{ dR.?Kv(,E  
 return (HCURSOR) m_hIcon; LKcp.i  
} =,;$d&#*h  
3Fn}nek  
void CCaptureDlg::OnCancel() hx&fV#m  
{ #`gX(C>  
 if(bTray) ~K#92  
  DeleteIcon(); As>Og  
  CDialog::OnCancel(); 8CRbo24"s  
} [zN*P$U]  
|3E|VGm~  
void CCaptureDlg::OnAbout() //|B?4kk  
{ ElpZzGj+  
 CAboutDlg dlg; 8%u|[Si;  
 dlg.DoModal(); $`7Fk%#+e  
} ysK J=  
DFQ`(1Q  
void CCaptureDlg::OnBrowse() R[l`# I  
{  w (RRu~J  
 CString str; TO5y.M|7  
 BROWSEINFO bi; HAI) +J   
 char name[MAX_PATH]; % vy,A*  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Gr&e]M[l  
 bi.hwndOwner=GetSafeHwnd(); de2G"'F  
 bi.pszDisplayName=name; fi>.X99(G  
 bi.lpszTitle="Select folder"; 7Ko*`-p  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; P.q7rk<  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); dtY8>klI  
 if(idl==NULL) B,_K mHItd  
  return; E_A5KLP  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); AEnkx!o  
 str.ReleaseBuffer(); KG(FA  
 m_Path=str; wT- -i@@  
 if(str.GetAt(str.GetLength()-1)!='\\') 0_ST2I"Ln  
  m_Path+="\\"; \.iejB  
 UpdateData(FALSE); k"gm;,`  
} ]U'zy+  
s?m_zJh  
void CCaptureDlg::SaveBmp() C4ktCN  
{ qonStIP  
 CDC dc; uwI"V|g%a&  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 6c(b*o  
 CBitmap bm; *rw6?u9I  
 int Width=GetSystemMetrics(SM_CXSCREEN); LlgFQfu8  
 int Height=GetSystemMetrics(SM_CYSCREEN); . G25D  
 bm.CreateCompatibleBitmap(&dc,Width,Height); qzORv  
 CDC tdc; Tim/7*vx  
 tdc.CreateCompatibleDC(&dc); !:5'MI@  
 CBitmap*pOld=tdc.SelectObject(&bm); w@R"g%k-  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); zfI{cMn'J  
 tdc.SelectObject(pOld); YI*H]V%w  
 BITMAP btm; h@*I(ND<  
 bm.GetBitmap(&btm); ~a2|W|?  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; %hBwc#^  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); q({-C  
 BITMAPINFOHEADER bih; Tf!6N<dRXR  
 bih.biBitCount=btm.bmBitsPixel; VByA6^JR  
 bih.biClrImportant=0; ;Dp*.YJ  
 bih.biClrUsed=0; {`*Fu/Upb  
 bih.biCompression=0; "2-D[rYZ  
 bih.biHeight=btm.bmHeight; MtPdpm6\  
 bih.biPlanes=1; l x5.50mI  
 bih.biSize=sizeof(BITMAPINFOHEADER); 7_Te-i  
 bih.biSizeImage=size; Z?qLn6y1W  
 bih.biWidth=btm.bmWidth; 1>\V>g9  
 bih.biXPelsPerMeter=0; |ITCw$T  
 bih.biYPelsPerMeter=0; Q.jThP`p  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); -wx~*  
 static int filecount=0; :%AEwRZ  
 CString name; C :sgT6  
 name.Format("pict%04d.bmp",filecount++); dQrz+_   
 name=m_Path+name; . 4RU'9M  
 BITMAPFILEHEADER bfh; NpM;vO  
 bfh.bfReserved1=bfh.bfReserved2=0; <w*WL_P  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Oh10X.)i  
 bfh.bfSize=54+size; -&1P2m/46  
 bfh.bfOffBits=54; ws QuJrG  
 CFile bf; x|d?'  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ (U$;0`  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); /%7&De6Xg  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 7D>_<)%d=  
  bf.WriteHuge(lpData,size); 9 5j`^M)Q  
  bf.Close(); P"}"q ![  
  nCount++; V>obMr^5  
 } u' kG(<0Y  
 GlobalFreePtr(lpData); B0Z>di:  
 if(nCount==1) AFBWiuwI3  
  m_Number.Format("%d picture captured.",nCount); fD\Fq'29{  
 else Crj7n/mp]s  
  m_Number.Format("%d pictures captured.",nCount); ]gnEo.R  
  UpdateData(FALSE); 7Q Ns q  
} +3XaAk  
f>Ua7!b  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) P{ %Urv{U  
{ ^^!G{ *F  
 if(pMsg -> message == WM_KEYDOWN) :eL[nyQr  
 { y<nPZ<h  
  if(pMsg -> wParam == VK_ESCAPE) uJ0'`Q?6R9  
   return TRUE; nvwf!iU6  
  if(pMsg -> wParam == VK_RETURN) [FF}HWf  
   return TRUE; nTtEv~a_n  
 } FAc^[~E  
 return CDialog::PreTranslateMessage(pMsg); jK[*_V  
} '`<Fys&:  
#1*7eANfr  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4bw4!z9G  
{ nJYIkfdA  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ IaO R%B g  
  SaveBmp(); \I}EWI  
  return FALSE; ^ZS!1%1  
} @x!+_z  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 0k5uqGLXe  
 CMenu pop; :r "G Z  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); kmu`sk"  
 CMenu*pMenu=pop.GetSubMenu(0); w?8\9\ ;?  
 pMenu->SetDefaultItem(ID_EXITICON); A1Uy|Dl  
 CPoint pt; B1U!*yzG6  
 GetCursorPos(&pt); kMLJa=]$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); tEo-Mj5:  
 if(id==ID_EXITICON) NMhpKno  
  DeleteIcon(); rx9y^E5T`;  
 else if(id==ID_EXIT) 2T?Y  
  OnCancel(); T fIOS]  
 return FALSE; [Pjitw/?  
} v#s*I/kw  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); z6B#F<h  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) -nHkO&&R  
 AddIcon(); gzKMGL?%?  
 return res; S!gzmkGcj  
} #M'V%^xP  
zv;xxAX  
void CCaptureDlg::AddIcon() #+U1QOsz  
{ 1$C?+H  
 NOTIFYICONDATA data; zv/dj04>  
 data.cbSize=sizeof(NOTIFYICONDATA); ]s)Y">6  
 CString tip; d8 Jf3Mo  
 tip.LoadString(IDS_ICONTIP); Wuk8&P3  
 data.hIcon=GetIcon(0); 0m> 8  
 data.hWnd=GetSafeHwnd(); ]i0=3H2  
 strcpy(data.szTip,tip); Uz rf,I[  
 data.uCallbackMessage=IDM_SHELL; 6L\]Ee  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; zd!%7 UP  
 data.uID=98; EVaHb;  
 Shell_NotifyIcon(NIM_ADD,&data); K*,,j\Q.  
 ShowWindow(SW_HIDE); ),Yk53G6c  
 bTray=TRUE; P?|\Ig1Gk  
} ?mK&Slh.  
3pW4Ul@e  
void CCaptureDlg::DeleteIcon() ns\I Y<Yo  
{ MXEI/mDYK  
 NOTIFYICONDATA data; T=sAy/1oR  
 data.cbSize=sizeof(NOTIFYICONDATA); ibwV #6  
 data.hWnd=GetSafeHwnd(); 1HAnOy0   
 data.uID=98; =v<A&4  
 Shell_NotifyIcon(NIM_DELETE,&data); 0QfDgDX  
 ShowWindow(SW_SHOW); -Hw3rv3o  
 SetForegroundWindow(); gdqBT]j  
 ShowWindow(SW_SHOWNORMAL); vV 9vB3K5?  
 bTray=FALSE; EH M59s|B  
} }#4Ek8nFR  
cjg~?R  
void CCaptureDlg::OnChange() <~w3[i=  
{ 6P>}7R}  
 RegisterHotkey(); =0PGE#d{t  
} w >2G@  
srO>l ;Vf/  
BOOL CCaptureDlg::RegisterHotkey() NR8`nc1~  
{ P3 =#<Q.  
 UpdateData(); lP]Y^Gz  
 UCHAR mask=0; QE)zH)(  
 UCHAR key=0; I''n1v?N  
 if(m_bControl) 3)?WSOsL :  
  mask|=4; 8c9<kGm$E  
 if(m_bAlt) aL90:,V  
  mask|=2; M,li\)J!&  
 if(m_bShift) f`/('}t  
  mask|=1; 5}]+|d;  
  key=Key_Table[m_Key.GetCurSel()]; [ @"6:tTU  
 if(bRegistered){ .%.7~Nu,  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); SVn@q|N  
  bRegistered=FALSE; hp9LV2_5  
 } 7(tsmP  
 cMask=mask; .{`C>/"}  
 cKey=key; 5%fWX'mS  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); pO:]3qv  
 return bRegistered; C8Mx>6  
} F?H=2mzKbz  
&zEBfr  
  四、小结 U\j g X  
u1#(~[.  
  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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