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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: n6>#/eUH  
  AN m d!  
  一、实现方法 l'1pw  
~/U 1xk%  
  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: {z|)Njhg  
,ng Cv;s  
#pragma data_seg("shareddata") S?LQu  
HHOOK hHook =NULL; //钩子句柄 2.y-48Nz  
UINT nHookCount =0; //挂接的程序数目 dQX6(J j  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 QL/(72K  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 jd"@t*ZV  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey cZ*@$%_  
static int KeyCount =0; U>SShpmZA  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 T Z@]:e:"b  
#pragma data_seg() 7z,C}-q  
G _tCmu\  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 nW:C/{n2tG  
!F-w3 ]  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: [DOckf oZx  
'oVx#w^mf  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR n&/ `  
cKey,UCHAR cMask) DfD&)tsMQ  
{ N>1em!AS  
 BOOL bAdded=FALSE; Oo~; L,  
 for(int index=0;index<MAX_KEY;index++){ W*:.Gxv]  
  if(hCallWnd[index]==0){ 6_;icpN]  
   hCallWnd[index]=hWnd; MchA{p&Ol  
   HotKey[index]=cKey; {Mk6T1Bkq  
   HotKeyMask[index]=cMask; `(;m?<%  
   bAdded=TRUE; /}Axf"OE  
   KeyCount++; |-ALklXr  
   break; Rv>-4@fMJ  
  } Q{>k1$fkV  
 } Yh7t"=o  
 return bAdded; KF}hV9IU  
} Dy&i&5E.-l  
//删除热键 =svN#q5s  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~8+ Zs  
{ wJqMa9|  
 BOOL bRemoved=FALSE; o/)h"i0P  
 for(int index=0;index<MAX_KEY;index++){ JR|ck=tq  
  if(hCallWnd[index]==hWnd){ 1&OW4_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ q i;1L Kc  
    hCallWnd[index]=NULL; XT*sGM  
    HotKey[index]=0; :OZrH<SW  
    HotKeyMask[index]=0; ~ Iuf}D;  
    bRemoved=TRUE; djZqc5t  
    KeyCount--; S hWJ72c  
    break; 29b9`NXt  
   } N"R]Yp;j  
  } B[Scr5|  
 } gQuw1  
 return bRemoved; @mBQ?; qlK  
} 0+ '&`Q!u  
T-L||yE,h  
Zi i   
  DLL中的钩子函数如下: Or+U@vAnk  
00y!K m_D  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "sCRdx]_  
{ 33q}CzK  
 BOOL bProcessed=FALSE; rlLMT6r.8  
 if(HC_ACTION==nCode) 3d]S!=4H"  
 { HC8e>kP9b  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 @.l@\4m  
   switch(wParam) t{kG<J/l  
   {  6 gE7e|+  
    case VK_MENU: +'a^f5  
     MaskBits&=~ALTBIT; P@B]  
     break; _{KG 4+5\X  
    case VK_CONTROL: n\DV3rXI9  
     MaskBits&=~CTRLBIT; 2zb"MEOS5  
     break; {\5  
    case VK_SHIFT: L2z[   
     MaskBits&=~SHIFTBIT; <'*LRd$1  
     break; \8cx6 G'  
    default: //judge the key and send message  kJ}`V  
     break; tWRC$  
   } oc`H}Wvn  
   for(int index=0;index<MAX_KEY;index++){ b$jo Y*< 6  
    if(hCallWnd[index]==NULL) NLqzi%s  
     continue; abjQ)=u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0h_|t-9j  
    { Y3b *a".X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); +0Y&`{#Z  
     bProcessed=TRUE; %u'u kcL7  
    } 6&x@.1('z  
   } 7:1Lol-V  
  } c@7rqHU-0  
  else if((lParam&0xc000ffff)==1){ //有键按下 p5iuYHKk?  
   switch(wParam) ez$(c  
   { R m( "=(  
    case VK_MENU: }7Q%6&IR  
     MaskBits|=ALTBIT; 5b*C1HS@X  
     break; 8ib:FF(= u  
    case VK_CONTROL: a~w$#fo"`f  
     MaskBits|=CTRLBIT; L8B! u9%  
     break; 77Y/!~kd  
    case VK_SHIFT: w?[upn:K  
     MaskBits|=SHIFTBIT; Gc|idjW4  
     break; K"MX!  
    default: //judge the key and send message y6a3t G  
     break; O0.*Pmt  
   } (9a^$C*  
   for(int index=0;index<MAX_KEY;index++){ 4Nsp<Kn>  
    if(hCallWnd[index]==NULL) *EH~_F  
     continue; 1qA;/-Zr<o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M= (u]%\  
    { !Uo4,g6r+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "y}5;9#,  
     bProcessed=TRUE; MQ2}EY*A  
    } upmx $H>  
   } mfr|:i  
  } z{QqY.Gu{G  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ~"!fP3"e  
   for(int index=0;index<MAX_KEY;index++){ B@ EC5Ap*  
    if(hCallWnd[index]==NULL) Z`i(qCAd(  
     continue; %N._w!N<5n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6gDN`e,@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); L4W5EO$  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 R|(a@sL  
   } ;$4\e)AB  
  } Pq$n5fZC !  
 } 1% `Rs  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); e0 ecD3  
} 5 qA'  
f o3}W^0  
  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: gSj,E8-g  
R;LP:,)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); OyIw>Wfv  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "AqB$^S9t  
tH4B:Bgj!  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: #'`{Qv0,  
c:('W16  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) n$R)>n Y  
{ }@)[5N# A|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) [-w%/D%@  
 { y~V(aih}D  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 *-X[u:  
  SaveBmp(); %BODkc Zh  
  return FALSE; PA*5Bk="q  
 } !4!~L k=  
 …… //其它处理及默认处理  bN.Pex  
} DY*N|OnqJ  
EU#^7  
|7~<Is~ *  
  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。 >$7B wO  
zH r_!~  
  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。 Z\sDUJ  
]4e;RV-B  
  二、编程步骤 zt%Mx>V@  
v$9y,^p@e  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; pgo$ 61  
DmcZta8n]  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 8P`"M#fI  
eMzk3eOJ  
  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; 5)40/cBe  
46;uW{EY  
  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; 5h*p\cl!Y  
{;oPLr+Z  
  5、 添加代码,编译运行程序。 t{>q|0  
;.C\Ss<>*  
三、程序代码 j8gdlIx  
zuCSj~  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL K sCyFp  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) :!QAC@  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ L/[K"  
#if _MSC_VER > 1000 2g<Xtt7+o  
#pragma once jEwIn1  
#endif // _MSC_VER > 1000 !r-F>!~  
#ifndef __AFXWIN_H__ Q2> gU#  
#error include 'stdafx.h' before including this file for PCH 7>RY/O;Z,  
#endif rN>R|].  
#include "resource.h" // main symbols *zLMpL_  
class CHookApp : public CWinApp 5r0YA IJ  
{ lhJ'bYI  
 public: :6dxtl/{b:  
  CHookApp(); Y);=TM6s  
  // Overrides I1J-)R+  
  // ClassWizard generated virtual function overrides *1"+%Z^  
  //{{AFX_VIRTUAL(CHookApp) =~gvZV-<  
 public: 9YGY,s x  
  virtual BOOL InitInstance(); JXx wr)i  
  virtual int ExitInstance(); Xa&kIq}(g  
  //}}AFX_VIRTUAL i/.6>4tE:  
  //{{AFX_MSG(CHookApp) '%;m?t% q  
  // NOTE - the ClassWizard will add and remove member functions here. jiGTA:v  
  // DO NOT EDIT what you see in these blocks of generated code ! EM_d8o)`B  
  //}}AFX_MSG gM]:Ma  
  DECLARE_MESSAGE_MAP() d zMb5puH  
}; MK*r+xfSae  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Q{/Ef[(a@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); TqQ[_RKg2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ort(AfW  
BOOL InitHotkey(); p<%d2@lp  
BOOL UnInit(); _0I@xQj-  
#endif \U0'P;em  
E{@[k%,_  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. I+(nu47ZT  
#include "stdafx.h" qgB_=Q#E  
#include "hook.h" @F>D+=hS  
#include <windowsx.h> [>9is=>o.  
#ifdef _DEBUG gDzK{6Z}  
#define new DEBUG_NEW u&e~1?R  
#undef THIS_FILE YkADk9fE  
static char THIS_FILE[] = __FILE__; A}w/OA97RO  
#endif ?A0)L27UE&  
#define MAX_KEY 100 O0:q;<>z  
#define CTRLBIT 0x04 |BYRe1l6l  
#define ALTBIT 0x02 ykJ>*z  
#define SHIFTBIT 0x01 ]###w;  
#pragma data_seg("shareddata") ^f@=:eWI  
HHOOK hHook =NULL; @+DX.9  
UINT nHookCount =0; l"]V6!-U  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey VaPG-n>Vf  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT R-14=|7a-  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey &j6erwaT  
static int KeyCount =0; 4z)]@:`}z  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift {[F A#  
#pragma data_seg() a.Vuu)+Quw  
HINSTANCE hins; h`KU\X ) A  
void VerifyWindow(); <naz+QK'  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) [B3RfCV{  
//{{AFX_MSG_MAP(CHookApp) 0 "#HJA44  
// NOTE - the ClassWizard will add and remove mapping macros here. .]Z"C&"N]  
// DO NOT EDIT what you see in these blocks of generated code! |?9HU~B  
//}}AFX_MSG_MAP L.IlBjD  
END_MESSAGE_MAP() ! P4*+')M  
2zpr~cB=  
CHookApp::CHookApp() DwF hK*  
{ @|!z9Y*  
 // TODO: add construction code here, Z:gyz$9w  
 // Place all significant initialization in InitInstance 7 [7"A  
} JS77M-Ac  
92{\B- l  
CHookApp theApp; ?ubro0F:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $d4n"+7  
{ '>" 4  
 BOOL bProcessed=FALSE; ^@]3R QB  
 if(HC_ACTION==nCode) a{e4it  
 { \NC3'G:Ii  
  if((lParam&0xc0000000)==0xc0000000){// Key up Mihg:  
   switch(wParam) P;*(hY5&  
   { :EyD+!LJ  
    case VK_MENU: E"0>yl)  
     MaskBits&=~ALTBIT; >d6|^h'0  
     break; mc3"`+o  
    case VK_CONTROL: 4+ig' |o  
     MaskBits&=~CTRLBIT; {Ha57Wk8D  
     break; M3AXe]<eC1  
    case VK_SHIFT: Pc9H0\+Xk  
     MaskBits&=~SHIFTBIT; v0y(58Rz.  
     break; iQ{VY ^ 0  
    default: //judge the key and send message ite~E5?#  
     break; 0$njMnB2l  
   } #;<Y[hR{P  
   for(int index=0;index<MAX_KEY;index++){ Js;h%  
    if(hCallWnd[index]==NULL) hOeRd#AQK  
     continue; z)"=:o7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~XIb\m9H  
    { ,0k;!YK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); f!"w5qC^  
     bProcessed=TRUE; gFh*eCo   
    } @XVTU  
   } ;G!q Y  
  } cZ06Kx..  
  else if((lParam&0xc000ffff)==1){ //Key down W8<%[-r  
   switch(wParam) ,vDbp?)'U  
   { d'2A,B~_*  
    case VK_MENU: HTtnXBJ)*H  
     MaskBits|=ALTBIT; saAF+H/=  
     break; YS ][n_  
    case VK_CONTROL: qWw=8Bq  
     MaskBits|=CTRLBIT; o(HbGHIP  
     break; j<x_&1  
    case VK_SHIFT: W%J\qA  
     MaskBits|=SHIFTBIT; +v\oOBB)  
     break; NO3/rJ6-  
    default: //judge the key and send message j#6.Gq  
     break; qb4z T  
   } e;jdqF~v!  
   for(int index=0;index<MAX_KEY;index++) 'VbiVLWD  
   { ME dWLFf  
    if(hCallWnd[index]==NULL) UI#h&j5pW  
     continue; W4N{S.#!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F5Va+z,jg  
    { j@9T.P1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;);kEq/=P  
     bProcessed=TRUE; h\e.e3/  
    } Y0>y8U V  
   } *2?@ |<(r  
  } {8OCXus3m  
  if(!bProcessed){ a =QCp4^  
   for(int index=0;index<MAX_KEY;index++){ f<H2-(m  
    if(hCallWnd[index]==NULL) VE24ToI?W"  
     continue; 5m*,8]!-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) c|%6e(g"L  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;aBG,dr}i  
   } ]tD]Wx%  
  } =fbWz  
 } Uv.)?YeGh  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 40/Y\  
} %LV9=!w  
..qCPlK;  
BOOL InitHotkey() grYe&(`X  
{ G?ZXWu.  
 if(hHook!=NULL){ weQ_*<5%  
  nHookCount++; 8RX&k  
  return TRUE; uS-|wYE  
 } 2?5>o!C  
 else q@qsp&0/  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); "#]$r  
  if(hHook!=NULL) :0ep( <|;  
   nHookCount++; OnK4] S5  
  return (hHook!=NULL); R8 T x[CJ5  
} z}@7'_iJ  
BOOL UnInit() G#CXs:1pd+  
{ liZxBs :%i  
 if(nHookCount>1){ q@&6#B  
  nHookCount--; J1vR5wbu  
  return TRUE; 9F vFhY  
 } g*Phv|kI  
 BOOL unhooked = UnhookWindowsHookEx(hHook); '7/)Ot(  
 if(unhooked==TRUE){ y^k$Us  
  nHookCount=0; /,dz@   
  hHook=NULL; 8QK&_n*  
 } Gq6*SaTk  
 return unhooked; <UI [%yXj  
} <[phnU^ 8  
sS Mh`4'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (ZGbh MK  
{  <Uur^uB  
 BOOL bAdded=FALSE; y(&Ac[foS}  
 for(int index=0;index<MAX_KEY;index++){ 6mE\OS-I  
  if(hCallWnd[index]==0){ >Q/Dk7#  
   hCallWnd[index]=hWnd; _&x%^&{  
   HotKey[index]=cKey; I*&8^ r:A  
   HotKeyMask[index]=cMask; "8/,Y"W"  
   bAdded=TRUE; qLCR] _*  
   KeyCount++; N;d] 14|  
   break; cR{#V1Z  
  } ~?dI*BZ)]  
 } v^iAD2X/F  
 return bAdded; CAe!7HiR  
} ;`Z{7'^U  
GVz6-T~\>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) FlQGg VN  
{ @c#(.=  
 BOOL bRemoved=FALSE; 7P T{lT  
 for(int index=0;index<MAX_KEY;index++){ *I+Q~4  
  if(hCallWnd[index]==hWnd){ b'g )  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *R"/|Ka  
    hCallWnd[index]=NULL; O< I-  
    HotKey[index]=0; lFk R=!?=  
    HotKeyMask[index]=0; 0%B/,/PxD  
    bRemoved=TRUE; CAlCDfKW}  
    KeyCount--; us.~G  
    break; +_`7G^U?%  
   } E{\2='3\  
  } k!^{eOM  
 } K@2),(z  
 return bRemoved; Fcx&hj1gQ  
} }qUX=s GG  
NRuNKl.v  
void VerifyWindow() Fu~j8K  
{ o4;(Zi#Z  
 for(int i=0;i<MAX_KEY;i++){ g7|@  
  if(hCallWnd!=NULL){ |:o4w  
   if(!IsWindow(hCallWnd)){ Pfhmo $  
    hCallWnd=NULL; @ZJS&23E  
    HotKey=0; YR70BOxK  
    HotKeyMask=0; Smh,zCc>s  
    KeyCount--; vI?, 47Hj+  
   } 7^Uv7< pw  
  } SJLis"8  
 } > !JS:5|  
} JT?h1v<H]  
WAqINLdX  
BOOL CHookApp::InitInstance() _g8yDfcLG  
{ ^Pf WG*  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); WxDh;*am:  
 hins=AfxGetInstanceHandle(); AX INThJ  
 InitHotkey(); ]|@^1we  
 return CWinApp::InitInstance(); "4Nt\WQ  
} +_!QSU,@  
\wZe] G%S  
int CHookApp::ExitInstance() bD^owa  
{ ("@!>|H  
 VerifyWindow(); =M1I>  
 UnInit(); `V1]k_h  
 return CWinApp::ExitInstance(); sA~]$A;DM!  
}  }ZI7J  
V9vTsmo(  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Iv *<L a  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \['Cj*ek  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ B~mj 8l4  
#if _MSC_VER > 1000 :s,Z<^5a)g  
#pragma once ~u{uZ(~  
#endif // _MSC_VER > 1000 SM '|+ d  
0K+ne0I  
class CCaptureDlg : public CDialog do_[&  
{ e.>P8C<&  
 // Construction W^Yxny  
 public: (Z*!#}z`  
  BOOL bTray; .`lCWeHN  
  BOOL bRegistered; 6863xOv{T  
  BOOL RegisterHotkey(); 1oS/`)  
  UCHAR cKey; h8P)%p  
  UCHAR cMask; M}a6Vu9  
  void DeleteIcon(); 3]>|  i  
  void AddIcon(); #spCtZE  
  UINT nCount; | Iib|HQ)  
  void SaveBmp(); ^~dWU>  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor H|*m$| $,  
  // Dialog Data [ 3Gf2_  
  //{{AFX_DATA(CCaptureDlg) 8}[).d160  
  enum { IDD = IDD_CAPTURE_DIALOG }; XX@ZQcN  
  CComboBox m_Key; T%Lx%Qn  
  BOOL m_bControl; .>S!ji  
  BOOL m_bAlt; Ba,`TJ%y  
  BOOL m_bShift; eRYK3W  
  CString m_Path; \RiP  
  CString m_Number; *hx  
  //}}AFX_DATA vd ZW%-A&\  
  // ClassWizard generated virtual function overrides d$RIS+V  
  //{{AFX_VIRTUAL(CCaptureDlg) ` A>@]d  
 public: +TJCLZ..  
  virtual BOOL PreTranslateMessage(MSG* pMsg); M{@(G5  
 protected: zda 3 ,U2o  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support UZMd~|  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); uT{q9=w  
  //}}AFX_VIRTUAL uD'6mk*  
  // Implementation &&+H+{_Q  
 protected: ]'}L 1r  
  HICON m_hIcon; VRMXtQ*1Dm  
  // Generated message map functions ZH8,K Y"  
  //{{AFX_MSG(CCaptureDlg) L#J1b!D&<6  
  virtual BOOL OnInitDialog(); +nL[MSw  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); WLT"ji0w2  
  afx_msg void OnPaint(); 'NmRR]Q9  
  afx_msg HCURSOR OnQueryDragIcon(); 6'/ #+,d'  
  virtual void OnCancel(); D^O@'zP=At  
  afx_msg void OnAbout(); Nc`L;CP  
  afx_msg void OnBrowse(); Y|n"dMrL  
  afx_msg void OnChange(); "[J^YKoF  
 //}}AFX_MSG DI>s-7  
 DECLARE_MESSAGE_MAP() e= AKD#  
}; yAt ^;  
#endif +whDU2 "  
q 1,~  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file <YY14p  
#include "stdafx.h" >Ry01G]_/h  
#include "Capture.h" *pq\MiD/  
#include "CaptureDlg.h" [WmM6UEVS  
#include <windowsx.h> ;+%rw2Z,B  
#pragma comment(lib,"hook.lib") $i&zex{\  
#ifdef _DEBUG t_^4`dW`  
#define new DEBUG_NEW UNYqft4  
#undef THIS_FILE CTb%(<r  
static char THIS_FILE[] = __FILE__; ]G\}k  
#endif AH^/V}9H  
#define IDM_SHELL WM_USER+1 I,tud!p`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^c|/*u  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @dK Tx#gZ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; V88p;K$+  
class CAboutDlg : public CDialog LoV<:|GTI  
{ TbU#96"~.  
 public: V!Uc(  
  CAboutDlg(); &~CI<\o P  
  // Dialog Data ZVBXx\{s  
  //{{AFX_DATA(CAboutDlg) Xvu(vA  
  enum { IDD = IDD_ABOUTBOX }; @{Q4^'K"  
  //}}AFX_DATA 'L'R9&o<X  
  // ClassWizard generated virtual function overrides )`:UP~)H  
  //{{AFX_VIRTUAL(CAboutDlg) fC`&g~yK'  
 protected: 4RO}<$Nx}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]^E?;1$f?  
  //}}AFX_VIRTUAL sC'` ~}C  
  // Implementation }vuO$j  
 protected: CJY$G}rk  
  //{{AFX_MSG(CAboutDlg) FrS]|=LJhX  
  //}}AFX_MSG jcOcWB|  
  DECLARE_MESSAGE_MAP() 1}x%%RD_  
}; HJ"GnZp<  
uRvP hkqm  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ,+k\p5P  
{ [y(MCf19  
 //{{AFX_DATA_INIT(CAboutDlg) Ud?Q%) X  
 //}}AFX_DATA_INIT ^qs $v06  
} tQ)qCk07  
_6Sp QW  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) B\~}3!j  
{ oJ^P(]dw  
 CDialog::DoDataExchange(pDX); X ?O[r3<  
 //{{AFX_DATA_MAP(CAboutDlg) @d'j zs  
 //}}AFX_DATA_MAP H_a[)DT  
} zhQJy?>'m  
7!1S)dup  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3] Ct6  
 //{{AFX_MSG_MAP(CAboutDlg) (PL UFT  
 // No message handlers ?<!|  
 //}}AFX_MSG_MAP oH@78D0A  
END_MESSAGE_MAP() |yCMt:Hk  
6k%f  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) e~OpofJNb  
: CDialog(CCaptureDlg::IDD, pParent) 2y4bwi  
{ *dQSw)R  
 //{{AFX_DATA_INIT(CCaptureDlg) Gc?a+T  
  m_bControl = FALSE; K(4_a``05  
  m_bAlt = FALSE; )~>YH*g  
  m_bShift = FALSE; 1 MFbQs^  
  m_Path = _T("c:\\"); x}4q {P5$  
  m_Number = _T("0 picture captured."); 9hl_|r~%*  
  nCount=0; =X}J6|>X  
  bRegistered=FALSE; .-zom~N-?  
  bTray=FALSE; &oNAv-m^GD  
 //}}AFX_DATA_INIT Rq-ZL{LR7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 -"x$ZnHU  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); E .h*g8bXe  
} 0GwR~Z}Z  
43cE`9~  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) CIWO7bS  
{ ! nx{ X  
 CDialog::DoDataExchange(pDX); 0GLM(JmK  
 //{{AFX_DATA_MAP(CCaptureDlg) Gv&V|7-f0  
  DDX_Control(pDX, IDC_KEY, m_Key); P \I|,  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5P bW[  
  DDX_Check(pDX, IDC_ALT, m_bAlt); PCA4k.,T  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); mFeP9MfJ  
  DDX_Text(pDX, IDC_PATH, m_Path); C!gZN9-  
  DDX_Text(pDX, IDC_NUMBER, m_Number); kJU2C=m@e2  
 //}}AFX_DATA_MAP e-;}366}  
}  7GGUV  
4+n\k  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) )X7A  
//{{AFX_MSG_MAP(CCaptureDlg) ?dTD\)%A  
 ON_WM_SYSCOMMAND() }p V:M{Nu&  
 ON_WM_PAINT() /r 5eWR1G  
 ON_WM_QUERYDRAGICON() 4H/OBR  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) g(g& TO  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) [g,}gyeS(  
 ON_BN_CLICKED(ID_CHANGE, OnChange) c-w)|-ac.  
//}}AFX_MSG_MAP z:O8Ls^\T  
END_MESSAGE_MAP() )7@0[>  
)oZ dj`  
BOOL CCaptureDlg::OnInitDialog() "@kaHIf[  
{ f$( e\+ +  
 CDialog::OnInitDialog(); 6!o1XQr=Z  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); hTkyz la  
 ASSERT(IDM_ABOUTBOX < 0xF000); jPeYmv]  
 CMenu* pSysMenu = GetSystemMenu(FALSE); <@}9Bid!o  
 if (pSysMenu != NULL) 2oW"'43X  
 { XW9!p.*.U  
  CString strAboutMenu;  _F{C\}  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ~&O%N  
  if (!strAboutMenu.IsEmpty()) reVgqYp{{-  
  { }]Tx lSp!;  
   pSysMenu->AppendMenu(MF_SEPARATOR); I fir ,8  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); INf&4!&h  
  } CLSK'+l  
 } Xj*Wu_  
 SetIcon(m_hIcon, TRUE); // Set big icon hZ3bVi)L\  
 SetIcon(m_hIcon, FALSE); // Set small icon E`q_bn  
 m_Key.SetCurSel(0); #$vEGY}1  
 RegisterHotkey(); 8L XHk l  
 CMenu* pMenu=GetSystemMenu(FALSE); :gT4K-O j  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 6~{C.No}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); k9R9Nz|J  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); a.'*G6~Qgw  
 return TRUE; // return TRUE unless you set the focus to a control ^.tg7%dJ  
} X]=t>   
l6B@qYLZ  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 3 $w65=  
{ ^aQ"E9  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) c,22*.V/  
 { PFR:>^wK2  
  CAboutDlg dlgAbout; Bx!-"e  
  dlgAbout.DoModal(); _@g;8CA  
 } b -y  
 else !wNO8;(  
 { l2d{ 73h  
  CDialog::OnSysCommand(nID, lParam); l0] EX>"E  
 } 4 :=]<sc,  
} a?.=V  
@;kSx":b  
void CCaptureDlg::OnPaint() *I'yH8Fcn  
{ kT?J5u _o  
 if (IsIconic()) v<;Md-<  
 { Jwp7gYZ  
  CPaintDC dc(this); // device context for painting 'S~5"6r  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~ 1pr~  
  // Center icon in client rectangle S'14hk<  
  int cxIcon = GetSystemMetrics(SM_CXICON); Qd6FH2Pl  
  int cyIcon = GetSystemMetrics(SM_CYICON); WHI`/FM  
  CRect rect; =xrv~  
  GetClientRect(&rect); E9}C  #  
  int x = (rect.Width() - cxIcon + 1) / 2; % nIf)/2g  
  int y = (rect.Height() - cyIcon + 1) / 2; AS,%RN^.  
  // Draw the icon ;=@0'xPEa-  
  dc.DrawIcon(x, y, m_hIcon); -8Xf0_  
 } +#By*;BJ  
 else vy/-wP|1  
 { ]9X DS[<2`  
  CDialog::OnPaint(); +RXoi2"-q@  
 } Wm|lSisY  
} eFAnFJ][L  
"j-CZ\]U|  
HCURSOR CCaptureDlg::OnQueryDragIcon() r/sNrB1U"y  
{ HThcn1u~^b  
 return (HCURSOR) m_hIcon; J;%Xfx]  
} _|]x2xb)  
m,S{p<-h  
void CCaptureDlg::OnCancel() kLY^!  
{ {[(h[MW#  
 if(bTray) fV:83|eQ  
  DeleteIcon(); {T8Kk)L  
  CDialog::OnCancel(); iUwzs&frd  
} dd["dBIZ '  
2(nlJ7R  
void CCaptureDlg::OnAbout() OH"XrCX7n  
{ a> )f=uS  
 CAboutDlg dlg; 6Iw\c  
 dlg.DoModal(); - DCbko  
} o.\oA6P_  
4sM.C9W  
void CCaptureDlg::OnBrowse() + )?J#g  
{ ?}7p"3j'z  
 CString str; d"NLE'R  
 BROWSEINFO bi; 5coZ|O&f8  
 char name[MAX_PATH]; Ewm9\qmg  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); X(C$@N  
 bi.hwndOwner=GetSafeHwnd(); {PmZ9  
 bi.pszDisplayName=name; %UM *79  
 bi.lpszTitle="Select folder"; 1U\z5$V  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *' X3z@R  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Jo}eeJ;k  
 if(idl==NULL) Sc   
  return; ETLD$=iS  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); `lPfb[b  
 str.ReleaseBuffer(); fzA9'i`  
 m_Path=str; pNIf=lA  
 if(str.GetAt(str.GetLength()-1)!='\\') +"6`q;p3)  
  m_Path+="\\"; 4X$Qu6#i  
 UpdateData(FALSE); Z/K{A`  
} $g7<Y*t[  
N [yy M'C  
void CCaptureDlg::SaveBmp() G9 :l'\  
{ 4aY|TN/|  
 CDC dc; Y<rU#Z#T  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); T#)P`q  
 CBitmap bm; ^H' \"9;7  
 int Width=GetSystemMetrics(SM_CXSCREEN); HKr Mim-  
 int Height=GetSystemMetrics(SM_CYSCREEN); wT\49DT"7  
 bm.CreateCompatibleBitmap(&dc,Width,Height); {_Gs*<.  
 CDC tdc; e]tDy0@  
 tdc.CreateCompatibleDC(&dc); HdG2X  
 CBitmap*pOld=tdc.SelectObject(&bm); :hV7> rr  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); \G3rX9xG  
 tdc.SelectObject(pOld); iyp=lLk  
 BITMAP btm; H4JTGt1"  
 bm.GetBitmap(&btm); +U.I( 83F  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; &f;K}W O  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); [h:T*(R?  
 BITMAPINFOHEADER bih; _,d~}_$`i  
 bih.biBitCount=btm.bmBitsPixel; @gtQQxf"  
 bih.biClrImportant=0; |a%Tp3Q~  
 bih.biClrUsed=0; 2dzrRH  
 bih.biCompression=0; U3:j'Su4H?  
 bih.biHeight=btm.bmHeight; d'I"jZ  
 bih.biPlanes=1; -S+zmo8  
 bih.biSize=sizeof(BITMAPINFOHEADER); wuqJr:q*#  
 bih.biSizeImage=size; nJLFfXWx  
 bih.biWidth=btm.bmWidth; {vO9p tR;  
 bih.biXPelsPerMeter=0; &yol_%C  
 bih.biYPelsPerMeter=0; ~3S~\0&|  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); /^|Dbx!u  
 static int filecount=0; 8'r[te4,  
 CString name; )tnh4WMh}  
 name.Format("pict%04d.bmp",filecount++); XF_pN[}  
 name=m_Path+name; WSY}d Vr  
 BITMAPFILEHEADER bfh; I,'k>@w{s  
 bfh.bfReserved1=bfh.bfReserved2=0; O<;3M'y\  
 bfh.bfType=((WORD)('M'<< 8)|'B'); .K<Q&  
 bfh.bfSize=54+size; CWP2{  
 bfh.bfOffBits=54; O5t[  
 CFile bf; :$9tF >  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ E`k@{*Hn&  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 0k(a VkZ I  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); A$xF$l  
  bf.WriteHuge(lpData,size); '!a'ZjYyi  
  bf.Close(); r{%qf;  
  nCount++; k,F6Tx  
 } ApXy=?fc  
 GlobalFreePtr(lpData); XNu^`Ha  
 if(nCount==1) H1(Uw:V8  
  m_Number.Format("%d picture captured.",nCount); `%Al>u5  
 else U2~kJ  
  m_Number.Format("%d pictures captured.",nCount); r_;N t  
  UpdateData(FALSE); ZEO,]$Yi7  
} O|N{ v"o  
\A6B,|@  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) e2W".+B1  
{ ^_5r<{7/ :  
 if(pMsg -> message == WM_KEYDOWN) B[?CbU  
 { v+=BCyT  
  if(pMsg -> wParam == VK_ESCAPE) f[^Aw(o  
   return TRUE; 'W,jMju  
  if(pMsg -> wParam == VK_RETURN) c>~*/%+  
   return TRUE; m&?r%x  
 } 1"M]3Kl  
 return CDialog::PreTranslateMessage(pMsg); U\<?z Dw  
} xZF}D/S?Ov  
P0PWJ^+,+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @)&=%  
{ tWa) _y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ M8b;d}XL  
  SaveBmp(); t; {F%9j{  
  return FALSE; y (pks$  
} s)Cjc.Qs  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ `&sH-d4v  
 CMenu pop; 1.9}_4!  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); B[-v[K2  
 CMenu*pMenu=pop.GetSubMenu(0); |:<f-j7t~  
 pMenu->SetDefaultItem(ID_EXITICON); !|S43i&p  
 CPoint pt; tX %5BTv  
 GetCursorPos(&pt); spPNr  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); xJ)n4)  
 if(id==ID_EXITICON) FXN/Yq  
  DeleteIcon(); ,1CIBFY  
 else if(id==ID_EXIT) Fv<F}h?6  
  OnCancel(); vucxt }Ti  
 return FALSE; 2!J&+r  
} bNNr]h8y-  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Pjjewy1}^  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) i,4>0o?  
 AddIcon(); iv;Is[<o  
 return res; M`i\VG  
} {I#]@,  
mFaZio0GK  
void CCaptureDlg::AddIcon() D(RTVef  
{ ^y1j.M@q  
 NOTIFYICONDATA data; (/j/>9iro  
 data.cbSize=sizeof(NOTIFYICONDATA); O7<]U_"I  
 CString tip; .1Al<OLL  
 tip.LoadString(IDS_ICONTIP); Ix=}+K/  
 data.hIcon=GetIcon(0); Vq?p|wy  
 data.hWnd=GetSafeHwnd(); ,+xB$e  
 strcpy(data.szTip,tip); c>RFdc:U  
 data.uCallbackMessage=IDM_SHELL; q):5JXql~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 9-DZU,`P  
 data.uID=98; A.F738Zp{Z  
 Shell_NotifyIcon(NIM_ADD,&data); :~T99^$zA  
 ShowWindow(SW_HIDE); ,\n&I(  
 bTray=TRUE; DBD%6o>]K  
} &NoS=(s,  
D9 |n)f  
void CCaptureDlg::DeleteIcon() MET' (m  
{ $79=lEn,  
 NOTIFYICONDATA data; "4+ WZR]  
 data.cbSize=sizeof(NOTIFYICONDATA); 0rDh}<upjk  
 data.hWnd=GetSafeHwnd(); ~SF<,-Kg  
 data.uID=98; I3mGo  
 Shell_NotifyIcon(NIM_DELETE,&data); lXiKY@R#  
 ShowWindow(SW_SHOW); P5nO78  
 SetForegroundWindow(); ]? g@jRs  
 ShowWindow(SW_SHOWNORMAL); ?_vakJ )  
 bTray=FALSE; 2Yn <2U/^R  
} OFv%B/O  
TQ*1L:X7M&  
void CCaptureDlg::OnChange() ^_u kLzP9  
{ 48qV >Gwf  
 RegisterHotkey(); &c:Ad% z  
} #( jw!d&  
,5, !es@`b  
BOOL CCaptureDlg::RegisterHotkey() E}p&2P+MR  
{ ;1.,Sn+zO  
 UpdateData(); _Khc3Jo  
 UCHAR mask=0; Z9 9>5\k  
 UCHAR key=0; D.Q=]jOs  
 if(m_bControl) M#VE]J  
  mask|=4; /ZPyN<@  
 if(m_bAlt) o .G!7  
  mask|=2; <55 g3>X  
 if(m_bShift) C/kW0V7  
  mask|=1; "C19b:4H  
  key=Key_Table[m_Key.GetCurSel()]; |J} Mgb-4  
 if(bRegistered){  L0@SCt  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); s4SG[w!d  
  bRegistered=FALSE; G <f@#[$'  
 } af+IP_6 .  
 cMask=mask; 80/F7q'tn  
 cKey=key; .#Z%1U%P.  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #9xd[A : N  
 return bRegistered; m{uxI za  
} )3w@]5j  
% !>I*H  
  四、小结 g,95T Bc  
MLWM&cFG  
  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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