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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: ZuzEg*lb  
  ,C\i^>=  
  一、实现方法 (!u~CZ;  
^cC,.Fdw  
  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: u=*FI  
c1(RuP:S  
#pragma data_seg("shareddata") .|KyNBn  
HHOOK hHook =NULL; //钩子句柄 BiLY(1,  
UINT nHookCount =0; //挂接的程序数目 G{~J|{t\yz  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 (Bb5?fw  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 5X:AbF  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey '`[&}R  
static int KeyCount =0; oi7@s0@  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 }^WdJd]P  
#pragma data_seg() RF$eQzW  
d UE,U=  
  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。 sPpH*,(  
-a}Dp~j  
  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: LtF,kAIt7v  
[-1^-bb  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR $?iLLA~  
cKey,UCHAR cMask) dA}-]  
{ FW;?s+Uyx  
 BOOL bAdded=FALSE; 'T;P;:!\  
 for(int index=0;index<MAX_KEY;index++){ {_"<1C  
  if(hCallWnd[index]==0){ Wx%H%FeK  
   hCallWnd[index]=hWnd; kOrZv,qFG[  
   HotKey[index]=cKey; S/hQZHZHg,  
   HotKeyMask[index]=cMask; wD}l$ & +  
   bAdded=TRUE; W &W5lArr  
   KeyCount++; #<"~~2?  
   break; JPI3[.o  
  } BQHVQs   
 } IJp-BTO{V  
 return bAdded; dh\'<|\K  
} Xh"n]TK  
//删除热键 gnf8 l?M  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [ZwjOi:)  
{ lN 4oW3QT  
 BOOL bRemoved=FALSE; tmYz R%i  
 for(int index=0;index<MAX_KEY;index++){ y3Qsv  
  if(hCallWnd[index]==hWnd){ St9?RD{4;  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !x=~g"d<&  
    hCallWnd[index]=NULL; QD&`^(X1p  
    HotKey[index]=0; u(.e8~s8  
    HotKeyMask[index]=0; kPG-hD  
    bRemoved=TRUE; `:fZ)$sY  
    KeyCount--;  :A_@,Q  
    break; ] )\Pqn(  
   } Igt#V;kK"2  
  } LKB$,pR~1l  
 } c9 eM/*:  
 return bRemoved; T@B/xAq5!  
} /N10  
k/_ 59@)  
dh iuI|?@  
  DLL中的钩子函数如下: E?f-wQF  
;%9|k U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9!\B6=r y4  
{ |$Sedzj'  
 BOOL bProcessed=FALSE; SYJD?&C;  
 if(HC_ACTION==nCode) ?pmHFlx  
 { [ -K&R  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 B)g[3gQ  
   switch(wParam) h 0Q5-EA  
   {  !dnH 7 "  
    case VK_MENU: `:KY\  
     MaskBits&=~ALTBIT; Ykw*&opz  
     break; >Eto( y"q  
    case VK_CONTROL: K#d`Hyx  
     MaskBits&=~CTRLBIT; ;(Or`u]Dr  
     break; 9ULQrq$?  
    case VK_SHIFT: S!CC }3zw  
     MaskBits&=~SHIFTBIT; AM\'RHL  
     break; s?}e^/"v  
    default: //judge the key and send message $szqy?i 0?  
     break; 5r|,CQ7o  
   } OX!tsARC@  
   for(int index=0;index<MAX_KEY;index++){ 19)i*\+  
    if(hCallWnd[index]==NULL) I;|B.j  
     continue; sY Qk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %/.b~|,-  
    { &%DY\*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;bib/  
     bProcessed=TRUE; 8qTys8  
    } 'G4ICtHQ  
   } ^"2J]&x`G  
  } Om\vMd@!  
  else if((lParam&0xc000ffff)==1){ //有键按下 xJ8M6O8  
   switch(wParam) *vxk@ `K~  
   { mxC;?s;~  
    case VK_MENU: ZhaP2pC%4  
     MaskBits|=ALTBIT; osAd1<EIC  
     break; *)T^Ch D,  
    case VK_CONTROL: >*_$]E  
     MaskBits|=CTRLBIT; 4F'LBS]=0  
     break; Jhhb7uU+  
    case VK_SHIFT: %T%sGDCV  
     MaskBits|=SHIFTBIT; IfAZn_  
     break; 9}<ile7^  
    default: //judge the key and send message zP8lN(LA  
     break; d.d/<  
   } Id .nu/  
   for(int index=0;index<MAX_KEY;index++){ 6ojo :-%Vf  
    if(hCallWnd[index]==NULL) .j0$J\:i  
     continue; ChPmX+.i_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Be2DN5)  
    { [D4SW#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); E KLyma&}Y  
     bProcessed=TRUE; >uhaW@d  
    } q"8e a/  
   } K=h9Ce  
  } 7*A],:-q  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 >W+%8e  
   for(int index=0;index<MAX_KEY;index++){ !ons]^km  
    if(hCallWnd[index]==NULL) y I  
     continue; ,f'CD{E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :KP @RZm  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); giw &&l=_  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 hRCJv#]HC  
   } 051 E6-  
  } Zt{[ *~  
 } L48_96  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 1 bU,$4  
} e\zm7_+i{  
C XMLt  
  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:  {Gk1vcq  
ZG8DIV\D7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); plstZ,#j  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 08\, <9  
eJX9_6m-  
  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: _|I#{jK  
zL0pw'4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $Sip$\+*  
{ Vv=. -&'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) |3"KK  
 {  SRDp*  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 p%=u#QNi  
  SaveBmp(); )}Kf=  
  return FALSE; Ka V8[|Gn,  
 } #f]SK[nR  
 …… //其它处理及默认处理 \V~eVf;~  
} Moza".fiN  
"`e{/7I  
2-EIE4ds  
  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。 5e^ChK0Q  
D'Df JwA  
  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。 v^*K:#<Q!  
 >Abdd  
  二、编程步骤 ;$wVu|&  
!?h;wR  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; >SHhAEF  
ul>3B4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; z$. 88 ^  
K Z91-  
  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; P}^W)@+3k  
c-6?2\]j@  
  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; =X:Y,?  
E*K;H8}s  
  5、 添加代码,编译运行程序。 0~/_|?]`7  
7[XRd9a5(  
三、程序代码 +\ .Lp 5  
>KhOz[Zg  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL :':s@gqr  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9qzHS~l  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ WW~sNC\3`(  
#if _MSC_VER > 1000 r[iflBP  
#pragma once ;[OH(!  
#endif // _MSC_VER > 1000 &}B|"s[  
#ifndef __AFXWIN_H__ {cVEmvE8  
#error include 'stdafx.h' before including this file for PCH c`w}|d]mC  
#endif ~=l;=7 T  
#include "resource.h" // main symbols m&&m,6``P  
class CHookApp : public CWinApp ENs&RZ;  
{ t-bB>q#3>  
 public: UySZbmP48  
  CHookApp(); 7~.9=I'A  
  // Overrides V {ddr:]4  
  // ClassWizard generated virtual function overrides u\;C;I-? '  
  //{{AFX_VIRTUAL(CHookApp) YUy0!`!`  
 public: 8'io$ 6d=  
  virtual BOOL InitInstance(); h MD|#A-<  
  virtual int ExitInstance(); SoSb+\* @h  
  //}}AFX_VIRTUAL KB(8f*  
  //{{AFX_MSG(CHookApp) M%P:n/j  
  // NOTE - the ClassWizard will add and remove member functions here. )1`0PJoHE  
  // DO NOT EDIT what you see in these blocks of generated code ! aj{Y\ 3L  
  //}}AFX_MSG m~0/&RA  
  DECLARE_MESSAGE_MAP() $B5aje}i  
}; tFOhL9T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); w+u3*/Zf  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Txb#C[`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |t#)~Oo  
BOOL InitHotkey(); j{+.tIzpq[  
BOOL UnInit(); [/41% B2  
#endif GH$pKB  
R8Fv{7]c  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Ean5b>\  
#include "stdafx.h" @<EO`L)Z  
#include "hook.h" Z o(rTCZX  
#include <windowsx.h> JOeeU8C  
#ifdef _DEBUG 1?+St`+{B-  
#define new DEBUG_NEW @Qt{jI !  
#undef THIS_FILE $}<e|3_  
static char THIS_FILE[] = __FILE__; k>si5'W  
#endif _g"<UV*H  
#define MAX_KEY 100 i2SR{e8:GF  
#define CTRLBIT 0x04 5MJS ~(  
#define ALTBIT 0x02 O5T{eBo\  
#define SHIFTBIT 0x01 p}U ~+:v  
#pragma data_seg("shareddata") Yufc{M00  
HHOOK hHook =NULL; $suzW;{#  
UINT nHookCount =0; v O_*yh1  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 1f=gYzuO)  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ":QZy8f9%  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey TJXT-\Vk  
static int KeyCount =0; CryBwm  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift LsU9 .  
#pragma data_seg() bdE[;+58  
HINSTANCE hins; ZyFjFHe+  
void VerifyWindow(); ?)d~cJ  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ^v7gIC  
//{{AFX_MSG_MAP(CHookApp) gT6jYQ  
// NOTE - the ClassWizard will add and remove mapping macros here. D_zZXbNc  
// DO NOT EDIT what you see in these blocks of generated code! suDQ~\ n  
//}}AFX_MSG_MAP Wt~BU.  
END_MESSAGE_MAP() \ta?b!Y),?  
JYHl,HH#z  
CHookApp::CHookApp() Y9XEP7  
{ Ao&"r[oJSv  
 // TODO: add construction code here, p>8D;#Hm L  
 // Place all significant initialization in InitInstance 0{-q#/  
} NyNXP_8  
' %o#q6O  
CHookApp theApp; O)r4?<Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) WOL:IZX%  
{ L$M9w  
 BOOL bProcessed=FALSE; OYn}5RN  
 if(HC_ACTION==nCode) FXkM#}RgNm  
 { IF:;`r@%  
  if((lParam&0xc0000000)==0xc0000000){// Key up "oO%`:pb  
   switch(wParam) }b.%Im<3R  
   { FJ)$f?=Qd  
    case VK_MENU: n,WqyNt*  
     MaskBits&=~ALTBIT; s|r3Gv|G  
     break; h>m"GpF x  
    case VK_CONTROL: k~1?VQ+?M  
     MaskBits&=~CTRLBIT; #!+:!_45  
     break; uJ v-4H  
    case VK_SHIFT: {&1/V  
     MaskBits&=~SHIFTBIT; 6i3$CW  
     break; gp.^~p]x  
    default: //judge the key and send message Z4 =GMXj  
     break; JY(WK@  
   } 2`=7_v  
   for(int index=0;index<MAX_KEY;index++){ _KAQ}G3  
    if(hCallWnd[index]==NULL) ^s"R$?;h  
     continue; ;>7De8v@@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I51@QJX  
    { NqWdRU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); nZYBE030  
     bProcessed=TRUE; /f;~X"!  
    } ak!G8'w  
   } I9ep`X6Y  
  } &gx%b*;`L0  
  else if((lParam&0xc000ffff)==1){ //Key down Q>i^s@0  
   switch(wParam) ['iPl/v0  
   { Q hO!Ma]  
    case VK_MENU: YT(AUS5n  
     MaskBits|=ALTBIT; BLD gt~h#  
     break; |Z +=  
    case VK_CONTROL: =Jb>x#Y  
     MaskBits|=CTRLBIT; %n9aaoD  
     break; JIq=* '  
    case VK_SHIFT: Z/+#pWBI!  
     MaskBits|=SHIFTBIT; 6(ol1 (U  
     break; oYH-wQj  
    default: //judge the key and send message C]A.i2o8  
     break; yD}B%\45  
   } l!u_"I8j5  
   for(int index=0;index<MAX_KEY;index++) g]0_5?i  
   { zy }$i?  
    if(hCallWnd[index]==NULL) v`1M[  
     continue; 1p=]hC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qY!Zt_Be6  
    { eehb1L2(b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 5$C-9  
     bProcessed=TRUE; 11;MN  
    } B tcy)LRk  
   } {_v#~595  
  } E~"y$Fqe  
  if(!bProcessed){ ZPYS$Ydy  
   for(int index=0;index<MAX_KEY;index++){ 9x =Y^',5  
    if(hCallWnd[index]==NULL) 6T`i/".  
     continue; b OY |H~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /mzlH  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); i=2N;sAl  
   } P5 ywhw-  
  } "=MeM)K  
 } e$rZ5X  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); b d!Y\OD  
} },-H"Qs  
7-fb.V9  
BOOL InitHotkey() }@d@3  
{ hp|YE'uYT  
 if(hHook!=NULL){ 2<}%kQ`  
  nHookCount++; L ~N460  
  return TRUE; h <<v^+m  
 } IW] rb/H  
 else aK^q_ghh[  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); "3Y0`&:D  
  if(hHook!=NULL) ey$&;1x#5  
   nHookCount++; ab?aQ*$+  
  return (hHook!=NULL); z<' u1l3  
} 4BpZJ~(p  
BOOL UnInit() 7 HYwLG:\~  
{ s!$a \k  
 if(nHookCount>1){ :Zw2'IV  
  nHookCount--; AH~E)S  
  return TRUE; R.<g3"Lm>  
 }  rjnrju+  
 BOOL unhooked = UnhookWindowsHookEx(hHook); FGq [ \B  
 if(unhooked==TRUE){ SXP]%{@ R/  
  nHookCount=0; pOoEI+t  
  hHook=NULL; iDqoa\  
 }  _6vW F  
 return unhooked; S{T >}'y  
} ]3Sp W{=^(  
|M;7>'YNC*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =[7Av>  
{ 8zW2zkv2|#  
 BOOL bAdded=FALSE; =41?^1\  
 for(int index=0;index<MAX_KEY;index++){ =Nr-iae#  
  if(hCallWnd[index]==0){ g *+>H1}  
   hCallWnd[index]=hWnd;  N4TV  
   HotKey[index]=cKey; (X*^dO  
   HotKeyMask[index]=cMask; M kXmA`cP  
   bAdded=TRUE; 8'y$M] e9n  
   KeyCount++; 0?|<I{z2  
   break; *.w 9c  
  } Z6MO^_m2  
 } !0<,@v"  
 return bAdded; +X 88;-  
} yyTnL 2Y9  
]u/sphPe  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h^P#{W!e\  
{ ;L ^o*`  
 BOOL bRemoved=FALSE; `r 4fm`<  
 for(int index=0;index<MAX_KEY;index++){ }3WxZv]I}  
  if(hCallWnd[index]==hWnd){ aV0"~5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]\HvKCN}  
    hCallWnd[index]=NULL; /&J T~M  
    HotKey[index]=0; "qy,*{~  
    HotKeyMask[index]=0; +k R4E23:  
    bRemoved=TRUE; [AJJSd/:  
    KeyCount--; nQ3A~ ()  
    break; Bdpy:'fJn  
   } l,aay-E  
  } V0a3<6@4  
 } w7&A0M  
 return bRemoved; k$:|-_(w  
} ~6md !o%i  
)NT*bLRPQ  
void VerifyWindow() (A.C]hD  
{ {R{=+2K!|k  
 for(int i=0;i<MAX_KEY;i++){ EU Fa5C:  
  if(hCallWnd!=NULL){ ]A_`0"m.U  
   if(!IsWindow(hCallWnd)){ j3ls3H&  
    hCallWnd=NULL; 0jWVp- y  
    HotKey=0; Bk{]g=DO  
    HotKeyMask=0; -m#)B~)  
    KeyCount--; SUK?z!f <i  
   } lPAQ3t!,  
  } =($xG#g`  
 } ,|/f`Pl  
} cPQiUU~W@  
YtLt*Ig%  
BOOL CHookApp::InitInstance() +&H4m=D-#a  
{ E' uZA  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); V>3X\)qu  
 hins=AfxGetInstanceHandle(); )0k53-h&  
 InitHotkey(); }c:M^Ff  
 return CWinApp::InitInstance(); 3Tm+g2w2V8  
} d2L&Z_}  
I)HPO,7  
int CHookApp::ExitInstance() 3=V &K-  
{ 'dc#F3  
 VerifyWindow(); 1Ai^cf:S  
 UnInit(); b%c9oR's^  
 return CWinApp::ExitInstance(); cso8xq|b7  
} tfWS)y7  
%\:Wi#w>  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file .x&%HA  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ML p9y#  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %!#azI  
#if _MSC_VER > 1000 ]hV*r@d  
#pragma once &BSn?  
#endif // _MSC_VER > 1000 :b!s2n!u  
X"*5+* z]  
class CCaptureDlg : public CDialog AbOf6%Env  
{ RPbZ(.  
 // Construction +aAc9'k   
 public: I5W~g.<6  
  BOOL bTray; ;5AcFB  
  BOOL bRegistered; Vi|#@tC'  
  BOOL RegisterHotkey(); ?Z}&EH  
  UCHAR cKey; EKN~H$.  
  UCHAR cMask; j5h-dK  
  void DeleteIcon(); uHNCSz H(  
  void AddIcon(); #[[ en  
  UINT nCount; tO&^>&;5  
  void SaveBmp(); N6TH}~62}  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 86H+h (R/  
  // Dialog Data |5]X| v  
  //{{AFX_DATA(CCaptureDlg) cidP|ie^  
  enum { IDD = IDD_CAPTURE_DIALOG }; f%8C!W]Dm  
  CComboBox m_Key; y|jq?M<A  
  BOOL m_bControl; 8RHUeRX  
  BOOL m_bAlt; "9807OME  
  BOOL m_bShift; D)}v@je"yP  
  CString m_Path; IAyp2  
  CString m_Number; >@Kx>cg+  
  //}}AFX_DATA 5 IpDeJ$  
  // ClassWizard generated virtual function overrides -tU'yKhn  
  //{{AFX_VIRTUAL(CCaptureDlg) ?&uu[y  
 public: /zox$p$?h  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @E8+C8'  
 protected: >.D4co>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u]G\H!Wk Q  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); H%{+QwzZ[j  
  //}}AFX_VIRTUAL 2>59q$ |  
  // Implementation JsS-n'gF'  
 protected: ^kSqsT"  
  HICON m_hIcon; 0IWf!Sk ]  
  // Generated message map functions Gp\ kU:}&  
  //{{AFX_MSG(CCaptureDlg) 4{Z)8;QX  
  virtual BOOL OnInitDialog(); h>bx}$q  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); (QiAisE  
  afx_msg void OnPaint(); O.JN ENZf  
  afx_msg HCURSOR OnQueryDragIcon(); UL9n-M =  
  virtual void OnCancel(); %SUQ9\SEs  
  afx_msg void OnAbout(); bs1Rvx1:J%  
  afx_msg void OnBrowse(); ;9'OOz|+1  
  afx_msg void OnChange(); . 'yCw#f  
 //}}AFX_MSG 'O-"\J\  
 DECLARE_MESSAGE_MAP() ABYcH]m  
}; :2)/FPL6  
#endif d0 /#nz  
Z #m+ObHK1  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file .o}v#W+st  
#include "stdafx.h" G]aOHJ:.  
#include "Capture.h" kvj#c  
#include "CaptureDlg.h" U`s{Jm  
#include <windowsx.h> W(/h Vt  
#pragma comment(lib,"hook.lib") HLi%%"'  
#ifdef _DEBUG (4-CF3D  
#define new DEBUG_NEW CTA 3*Gn  
#undef THIS_FILE ( uidNq  
static char THIS_FILE[] = __FILE__; h FBe,'3M  
#endif ] }X  
#define IDM_SHELL WM_USER+1 #)VF3T@#'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a-J.B.A$Z/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Yz93'HDB  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -D~%|).'  
class CAboutDlg : public CDialog |vzl. ^"-  
{ -35;j'a  
 public: 0Y5_PTWb+Y  
  CAboutDlg(); S0W||#Pr  
  // Dialog Data BfiD9ka-z  
  //{{AFX_DATA(CAboutDlg) ~7Ux@Sx;  
  enum { IDD = IDD_ABOUTBOX }; ;xn0;V'=  
  //}}AFX_DATA J4U1t2@)9  
  // ClassWizard generated virtual function overrides [opGZ`>)j"  
  //{{AFX_VIRTUAL(CAboutDlg) Qe(:|q _  
 protected: ku M$UYTTX  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support h!9ei6  
  //}}AFX_VIRTUAL _u9Jxw?F@Y  
  // Implementation }l9llu   
 protected: ] @fk] ]R  
  //{{AFX_MSG(CAboutDlg) |(^PS8wG  
  //}}AFX_MSG 11;zNjD|  
  DECLARE_MESSAGE_MAP() @`Su0W+.  
}; r#mx~OVkk  
Y\'}a+:@Ph  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) +x}<IS8  
{ Fv`,3aNB  
 //{{AFX_DATA_INIT(CAboutDlg) 6;5Ss?ep  
 //}}AFX_DATA_INIT iDrZc  
} Q=yg8CQ  
[)X\|pO&  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Z;)%%V%o  
{ h2J x]FJ  
 CDialog::DoDataExchange(pDX); eh#(eua0/  
 //{{AFX_DATA_MAP(CAboutDlg) vs{s_T7Mz]  
 //}}AFX_DATA_MAP kB%JNMF{A  
} y1L,0 ]  
7"D.L-H  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) A\5L 7  
 //{{AFX_MSG_MAP(CAboutDlg) C$)onk  
 // No message handlers l%i+cOD  
 //}}AFX_MSG_MAP x'R`. !g3  
END_MESSAGE_MAP() Od)C&N=y  
9( wK@  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Wo=jskBrQ  
: CDialog(CCaptureDlg::IDD, pParent) `Ryp% Bn  
{ <1M-Ro?5k  
 //{{AFX_DATA_INIT(CCaptureDlg) ;t`&n['N>  
  m_bControl = FALSE; U :_^#\p  
  m_bAlt = FALSE; \1Em`nvOX  
  m_bShift = FALSE; r" ,GC]  
  m_Path = _T("c:\\"); sCHJ&>m5-  
  m_Number = _T("0 picture captured."); "C`Ub  
  nCount=0; [}]Q?*_  
  bRegistered=FALSE; S>1Iky|  
  bTray=FALSE; -A!%*9Z  
 //}}AFX_DATA_INIT 7Hu3>4<  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 J5jvouR  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); jEJT-*I1+  
} uM6+?A9@l  
k"w"hg&e  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) k|d+#u[Mj@  
{ $* Kvc$D  
 CDialog::DoDataExchange(pDX); wLr_-vJ  
 //{{AFX_DATA_MAP(CCaptureDlg) wq`Bd  
  DDX_Control(pDX, IDC_KEY, m_Key); }RqK84K  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); >[*qf9$  
  DDX_Check(pDX, IDC_ALT, m_bAlt); *c+ (-  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); < c/5b]No  
  DDX_Text(pDX, IDC_PATH, m_Path); *~i ])4  
  DDX_Text(pDX, IDC_NUMBER, m_Number); /&94 eC  
 //}}AFX_DATA_MAP ,zY$8y]  
} lHX72s|V  
2jhxQL  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 1|wL\I  
//{{AFX_MSG_MAP(CCaptureDlg) f& '  
 ON_WM_SYSCOMMAND() N]sAji*  
 ON_WM_PAINT() I,8Er2;)  
 ON_WM_QUERYDRAGICON() C;urBsC  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) uGlUc<B\*  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) q'8 2qY  
 ON_BN_CLICKED(ID_CHANGE, OnChange) HHsmLo c4  
//}}AFX_MSG_MAP U4B( #2'  
END_MESSAGE_MAP() wD)XjX  
~e@z;]CiY  
BOOL CCaptureDlg::OnInitDialog() TRq6NB  
{ "9e\c;a  
 CDialog::OnInitDialog(); L;I]OC^J  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); c0u^zH<  
 ASSERT(IDM_ABOUTBOX < 0xF000); DR<9#RRD  
 CMenu* pSysMenu = GetSystemMenu(FALSE); &.?'i1!  
 if (pSysMenu != NULL) n.(FQx.F  
 { @MCg%Afw  
  CString strAboutMenu; g}',(tPMZ  
  strAboutMenu.LoadString(IDS_ABOUTBOX); K(Bf2Mfq  
  if (!strAboutMenu.IsEmpty()) 'Qe;vZ31K  
  { lU8`F(Mn  
   pSysMenu->AppendMenu(MF_SEPARATOR); :6\qpex  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); :20W\P<O!A  
  } Ciz X<Cr}  
 } B&uz;L3  
 SetIcon(m_hIcon, TRUE); // Set big icon k\GcHI-  
 SetIcon(m_hIcon, FALSE); // Set small icon RrQJ/ts7}  
 m_Key.SetCurSel(0); )P|),S,;Z  
 RegisterHotkey(); "LTad`]<Ro  
 CMenu* pMenu=GetSystemMenu(FALSE); A~t j/yq9  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); BR yl4  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }U"&8%PZr  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); W:L AP R  
 return TRUE; // return TRUE unless you set the focus to a control WI-1)1t  
} y_lU=(%Jd  
r<^HmpUJ  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) B_m8{44zM  
{ >I&5j/&}+  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) @6T/Tdz  
 { ikiypWq  
  CAboutDlg dlgAbout; >V}#[/n  
  dlgAbout.DoModal(); V33T+P~j  
 } :G%61x&=Zc  
 else wDe& 1(T^  
 { z~ /` 1  
  CDialog::OnSysCommand(nID, lParam); f=K]XTw~  
 } v z '&%(  
} ;@|n @ax  
81 sG  
void CCaptureDlg::OnPaint() v,>Dbxn  
{ @t_=Yl2;  
 if (IsIconic()) Z}Ft:7   
 { DN57p!z  
  CPaintDC dc(this); // device context for painting o:Sa, !DK  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Z@PmM4F@S  
  // Center icon in client rectangle HRfYl,S,  
  int cxIcon = GetSystemMetrics(SM_CXICON); wEvVL  
  int cyIcon = GetSystemMetrics(SM_CYICON); ?+}_1x`  
  CRect rect; 'AS|ZRr/  
  GetClientRect(&rect); xYpd: Sm  
  int x = (rect.Width() - cxIcon + 1) / 2; :^B1~p(?sK  
  int y = (rect.Height() - cyIcon + 1) / 2; O[JL+g4  
  // Draw the icon ZX./P0  
  dc.DrawIcon(x, y, m_hIcon); `&ckZiq  
 } .5ha}=z  
 else .jWC$SVR  
 { 1NA.nw.  
  CDialog::OnPaint(); ^sLdAC  
 } Cd}<a?m,  
} 68WO~*  
\n|EM@=eE  
HCURSOR CCaptureDlg::OnQueryDragIcon() P:MT*ra*,  
{ [%1CRk  
 return (HCURSOR) m_hIcon; %2V?,zY@  
} K^<BW(s  
Q:d]imw!O  
void CCaptureDlg::OnCancel() 0[?Xxk}s0  
{ ?QdWrE_  
 if(bTray) aQ\$A`?  
  DeleteIcon(); :(*V?WI  
  CDialog::OnCancel(); K:# I  
} *d4 eK+U$5  
\\B(r  
void CCaptureDlg::OnAbout() @>Km_Ax  
{ VY=jc~c]v  
 CAboutDlg dlg; ^Q?  
 dlg.DoModal(); nazZ*lC  
} Gm^U;u}=f  
q ,]L$  
void CCaptureDlg::OnBrowse() 4yA+ h2  
{ 0rs"o-s<  
 CString str; V#gK$uv  
 BROWSEINFO bi; gu.}M:u  
 char name[MAX_PATH]; eiaFaYe\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 1JG'%8}#8  
 bi.hwndOwner=GetSafeHwnd(); L2i_X@/  
 bi.pszDisplayName=name; ~YWQ2]  
 bi.lpszTitle="Select folder"; wIaony  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; =|y9UlsD  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); j[J-f@F \Y  
 if(idl==NULL) j@3Q;F0ba  
  return; r1{@Ucw2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); TpwkD_fg  
 str.ReleaseBuffer(); ^7WN{0  
 m_Path=str; jZkcBIK2  
 if(str.GetAt(str.GetLength()-1)!='\\') a P@N)"  
  m_Path+="\\"; [uN? ~lp\%  
 UpdateData(FALSE); =Toy Zm\  
} >7T'OC  
h_3E)jc  
void CCaptureDlg::SaveBmp() fW1CFRHH  
{ a:OQGhc=  
 CDC dc; ~1AgD-:Jz  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); `MN4uC  
 CBitmap bm; ,77d(bR<  
 int Width=GetSystemMetrics(SM_CXSCREEN); _FU_Ubkr  
 int Height=GetSystemMetrics(SM_CYSCREEN); $AjHbU.I{  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Ed df2;-.  
 CDC tdc; ?(F6#"/E  
 tdc.CreateCompatibleDC(&dc); ,pQZ@I\z  
 CBitmap*pOld=tdc.SelectObject(&bm); ;) z:fToh  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); bSi%2Onj  
 tdc.SelectObject(pOld); 2,b(,3{`4:  
 BITMAP btm; BLf>_b Uk  
 bm.GetBitmap(&btm); h# o6K#  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; g63(E,;;J  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); XZ]uUP  
 BITMAPINFOHEADER bih; -4IE]'##  
 bih.biBitCount=btm.bmBitsPixel; +RMSA^  
 bih.biClrImportant=0; i0kak`x0  
 bih.biClrUsed=0; }t=!(GOb}  
 bih.biCompression=0; }9#r0Vja  
 bih.biHeight=btm.bmHeight; ub#a`  
 bih.biPlanes=1; CMG&7(MR  
 bih.biSize=sizeof(BITMAPINFOHEADER); }Gm>`cw-  
 bih.biSizeImage=size; S8wLmd>  
 bih.biWidth=btm.bmWidth; N&+x+;Kx  
 bih.biXPelsPerMeter=0; ^]0Pfna+N  
 bih.biYPelsPerMeter=0; :tB1D@Cb6  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); c&?m>2^6  
 static int filecount=0; Sc1 8dC0  
 CString name; gpvYb7Of0  
 name.Format("pict%04d.bmp",filecount++); kY|utoAP  
 name=m_Path+name; H.|#c^I  
 BITMAPFILEHEADER bfh; GxI!{oi2  
 bfh.bfReserved1=bfh.bfReserved2=0; FF(#]vz'  
 bfh.bfType=((WORD)('M'<< 8)|'B'); `O!X((  
 bfh.bfSize=54+size; /h H  
 bfh.bfOffBits=54; lH x^D;m6  
 CFile bf; Kp~VS<3  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ SpLzm A  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); rv^@,8vq  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); n&;85IF1  
  bf.WriteHuge(lpData,size); TA`1U;c{n  
  bf.Close(); =_ ./~  
  nCount++; (ybI\UI  
 } WwBOM~/`2  
 GlobalFreePtr(lpData); ;!mzyb*  
 if(nCount==1) L:pYn_  
  m_Number.Format("%d picture captured.",nCount); qYjce]c  
 else 2W96Zju\  
  m_Number.Format("%d pictures captured.",nCount); vrhT<+q  
  UpdateData(FALSE); JPc+rfF  
} $%CF8\0  
sV{,S>s   
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Sw8]EH6  
{ r6MMCJ|G  
 if(pMsg -> message == WM_KEYDOWN) 3G)#5 Lf<  
 { 7u S~MW  
  if(pMsg -> wParam == VK_ESCAPE) ?GoR^p #p  
   return TRUE; l|~A#kq  
  if(pMsg -> wParam == VK_RETURN) rb2S7k0{  
   return TRUE; Jr ,;>   
 } D3Ig>gKo?m  
 return CDialog::PreTranslateMessage(pMsg); ug!s7fo^  
} J6s`'gFns  
qo90t{|c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ustv{:7v  
{ nQX:T;WL@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ uD$u2  
  SaveBmp(); hk(ZM#Bh  
  return FALSE; <EB+1GFuI  
} B:;pvW]  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @fZ,.2ar  
 CMenu pop; |mdVdD~go  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ( iBl   
 CMenu*pMenu=pop.GetSubMenu(0);  3s,g*  
 pMenu->SetDefaultItem(ID_EXITICON); .779pT!,M  
 CPoint pt; ?cBwPetp  
 GetCursorPos(&pt); DnMwUykF>0  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); av}k)ZT_  
 if(id==ID_EXITICON) eueH)Xkf  
  DeleteIcon(); G7` ko1-  
 else if(id==ID_EXIT) \Xt7`I<  
  OnCancel(); +qtJaYf/0  
 return FALSE; Bw)/DM]  
} F# ,90F'  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 2\A$6N ;_  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) UUYSFa %  
 AddIcon(); g|DF[  
 return res; N=T<_`$5  
} RE7?KR>  
t9kzw*U9  
void CCaptureDlg::AddIcon() $k@O`xD,q  
{ ??-[eB.  
 NOTIFYICONDATA data; 25nt14Y 0u  
 data.cbSize=sizeof(NOTIFYICONDATA); <y2U3; t  
 CString tip; (^8Y|:Tz  
 tip.LoadString(IDS_ICONTIP); ~drS} V  
 data.hIcon=GetIcon(0); zH?!  
 data.hWnd=GetSafeHwnd(); u<7/0;D#+  
 strcpy(data.szTip,tip); }l(&}#dY  
 data.uCallbackMessage=IDM_SHELL; Gv!2f  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~NrG` D}  
 data.uID=98; EnKR%Ctw  
 Shell_NotifyIcon(NIM_ADD,&data); 'NXN& {  
 ShowWindow(SW_HIDE); ?/wm(uL  
 bTray=TRUE; )0.kv2o.  
} }>pknc?  
8O5s`qKMYT  
void CCaptureDlg::DeleteIcon() ]}<}lI9  
{ fIx+IL s  
 NOTIFYICONDATA data; 4x=v?g&  
 data.cbSize=sizeof(NOTIFYICONDATA); %B2'~|g  
 data.hWnd=GetSafeHwnd(); $-OA'QwB]  
 data.uID=98; BM%e0n7  
 Shell_NotifyIcon(NIM_DELETE,&data); APn|\  
 ShowWindow(SW_SHOW); m)ky*"(  
 SetForegroundWindow(); :[p}  
 ShowWindow(SW_SHOWNORMAL); XV7Ex\D*  
 bTray=FALSE; )al]*[lY  
} VZp5)-!\  
!_]Y~[  
void CCaptureDlg::OnChange() O@T9x$  
{ 2@n{yYwy  
 RegisterHotkey(); [`#CXq'  
} @ wGPqg  
1![!+X:w  
BOOL CCaptureDlg::RegisterHotkey() e/KDw  
{ !fV+z%:  
 UpdateData(); Avge eJi  
 UCHAR mask=0; j"t(0 m  
 UCHAR key=0; IA fc T!{  
 if(m_bControl) 1*P~!2h  
  mask|=4; .wEd"A&j  
 if(m_bAlt) *<$*"p  
  mask|=2; ttaM.  
 if(m_bShift) aq>kTaz  
  mask|=1; & TCkpS  
  key=Key_Table[m_Key.GetCurSel()]; zq 3\}9  
 if(bRegistered){ }kw#7m54  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); B+|Kjlt  
  bRegistered=FALSE; DTX0  
 } DzAg"6=CS  
 cMask=mask; yJ[0WY8<kC  
 cKey=key; QGMV}y  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); <O(4TO  
 return bRegistered; |%BOZT  
} 70 yFaW  
fF!Yp iI"  
  四、小结 h/QXPdV  
qJf?o.Pv  
  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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