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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: Urm(A9|N  
  0;5qo~1  
  一、实现方法 utdus:B#0  
0d,&)  
  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:  =VSUE Pq  
E_xCRfw_i]  
#pragma data_seg("shareddata") AhV V  
HHOOK hHook =NULL; //钩子句柄 + VhD]!  
UINT nHookCount =0; //挂接的程序数目 N@? z&urQi  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 R"`<ZY6(Ou  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 }1Hy[4B(k\  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey  ~Ctq  
static int KeyCount =0; I~M@v59C  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 F{17K$y  
#pragma data_seg() X5)].[d  
yEL5U{  
  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。 @vi;P ^1!  
F^DDN7AKH  
  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: J.,7d ,  
U)S!@ 2(4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR /a-OB U  
cKey,UCHAR cMask) 7@!ne&8Z?  
{ $Ehe8,=fj  
 BOOL bAdded=FALSE; dEoW8 M#  
 for(int index=0;index<MAX_KEY;index++){ F$,i_7Z&6  
  if(hCallWnd[index]==0){ ibuoq X`  
   hCallWnd[index]=hWnd; dJ,,yA*  
   HotKey[index]=cKey; =W'{xG}  
   HotKeyMask[index]=cMask; 4^w`] m  
   bAdded=TRUE; QL@}hw.F  
   KeyCount++; T;Ra/H  
   break; enQev?8%  
  } $gcC}tX  
 } YLNJ4nE  
 return bAdded; U'xmn$ O  
} Z=144n 1  
//删除热键 D0p>Q^w  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) JN<u4\e{-&  
{ X./7b{Pax  
 BOOL bRemoved=FALSE; &Y8S! W@4  
 for(int index=0;index<MAX_KEY;index++){ d+6-ten  
  if(hCallWnd[index]==hWnd){ G4K3qD#+H  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )cRP6 =  
    hCallWnd[index]=NULL; ET=-r  
    HotKey[index]=0; {r[g.@  
    HotKeyMask[index]=0; li)shp)  
    bRemoved=TRUE; $-BM`Zt0;  
    KeyCount--; }FAO.  
    break; D]5cijO6  
   } 5uvFCY./c  
  } II}3w#r4  
 } ujoJ6UOG  
 return bRemoved; cY%6+uJ1  
} IaYy5Rw  
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;fKFmY41  
  DLL中的钩子函数如下: /: }"Zb  
~`CWpc:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4wx _@8  
{ k9o LJ<.k  
 BOOL bProcessed=FALSE; e_t""h4D  
 if(HC_ACTION==nCode) af;~<o a  
 { 8s<t* pI2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 QR{pph*zn-  
   switch(wParam) p V`)  
   {  ood,k{  
    case VK_MENU: 2mPU /  
     MaskBits&=~ALTBIT; ^yVKW5x  
     break; +FlO_=Bu  
    case VK_CONTROL: -@G,Ry-\t  
     MaskBits&=~CTRLBIT; S5xum_Dq  
     break; !:<n]-U  
    case VK_SHIFT: P4dhP-t  
     MaskBits&=~SHIFTBIT; ]^DNzqu=@h  
     break; ~&T%u.u 7  
    default: //judge the key and send message lX|d:HFtP  
     break; " midC(rTm  
   } Z'4oE )  
   for(int index=0;index<MAX_KEY;index++){ iz\GahK  
    if(hCallWnd[index]==NULL) \6c8Lqa  
     continue; t8upS u|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Yuqt=\? #  
    { fg0zD:@rA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )2y# cM*  
     bProcessed=TRUE; .l ufE  
    } e"ur+7  
   } 5"I8ric  
  } /.%AE|0+X  
  else if((lParam&0xc000ffff)==1){ //有键按下 L{AfrgN  
   switch(wParam) {Z{!tR?+  
   { rIZ^ix-N  
    case VK_MENU: ).9m6.%Uk  
     MaskBits|=ALTBIT; -jQM h  
     break; 4 .d~u@=  
    case VK_CONTROL: V /,F6  
     MaskBits|=CTRLBIT; u40<>A  
     break; f" g-Hbl5  
    case VK_SHIFT: t7qY!S (  
     MaskBits|=SHIFTBIT; |$a!Zx94^  
     break; H m Z*  
    default: //judge the key and send message d{G*1l(X  
     break; We*&\e+"T  
   } E [b6k&A  
   for(int index=0;index<MAX_KEY;index++){ l5esx#([*R  
    if(hCallWnd[index]==NULL) iF'qaqHWY4  
     continue; !1cVg ls|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "kg;fF|  
    { `78)|a*R.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [5sa1$n96G  
     bProcessed=TRUE; SK G!DKQ  
    } %Y*]eLT>  
   } UKBaGX:v  
  } &5o ln@YL  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 !f!HVna  
   for(int index=0;index<MAX_KEY;index++){ N@r`+(_t  
    if(hCallWnd[index]==NULL) Cp.qL  
     continue; y ZR\(\?<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;f+bIYQz  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Y5?OJO{h"  
     //lParam的意义可看MSDN中WM_KEYDOWN部分  El:&  
   } $ %BNoSK  
  } EHqcQx`K_  
 } E-J<%+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -Ay=*c.4  
} ^4 ?LQ[t'  
@fO[{V  
  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: l.`f^K=8  
A~MIFr/8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v3/l= e?u  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); TG@ W:>N(  
iW,fKXuo&y  
  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: qrZ*r{3  
uKE?VNC]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) EX9os  
{ #Z>EX?VS:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 1&Ruz[F5  
 { GFppcL@a  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $PE{}`#g  
  SaveBmp(); C3>`e3v  
  return FALSE; $K}Y  
 } -N~eb^3[c  
 …… //其它处理及默认处理 w_lN[u-L  
} _@:O&G2nB  
P!K;`4Ika  
8ZPjzN>c6  
  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。 mKN#dmw6  
JuTIP6 /G  
  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。 4%9 +="  
1DT}_0{0Q  
  二、编程步骤 X4{O/G  
o1?bqVF;6  
  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"; 99tKs  
9qXKHro  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; }Z Nyd  
2~(\d\k  
  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; E[2>je  
$++SF)G1]_  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; uA~T.b\  
Os>^z@x  
  5、 添加代码,编译运行程序。 [) S&PK  
MWZH-aA(.  
三、程序代码 yhJA{nL=  
QssU\@ / Q  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL |\k,qVQ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) g\ q*,1  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ +4]31d&3  
#if _MSC_VER > 1000 h}knn3"S  
#pragma once 5w#7B  
#endif // _MSC_VER > 1000 T(2*P5%&  
#ifndef __AFXWIN_H__ w_h}c$;GK  
#error include 'stdafx.h' before including this file for PCH CPt62j8  
#endif LZF %bJv  
#include "resource.h" // main symbols $zv&MD!&h  
class CHookApp : public CWinApp nTQ&nu!  
{ $2'Q'Mx[gd  
 public: v3 ]mZ}W$  
  CHookApp(); *j"u~ N F  
  // Overrides FQW{c3%qZ  
  // ClassWizard generated virtual function overrides |fhYft  
  //{{AFX_VIRTUAL(CHookApp) }{S f*  
 public: $G}!eV 6  
  virtual BOOL InitInstance(); d:SLyFD$q  
  virtual int ExitInstance(); D,sb {N  
  //}}AFX_VIRTUAL k^C^.[?  
  //{{AFX_MSG(CHookApp) "-afHXED  
  // NOTE - the ClassWizard will add and remove member functions here. (HD8Mm  
  // DO NOT EDIT what you see in these blocks of generated code ! uXkc07 r'  
  //}}AFX_MSG .Mb<.R3  
  DECLARE_MESSAGE_MAP() 3tu:Vc.:M  
}; 2SV}mK U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ilr'<5 rq  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yZcnky  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); lZ>j:/R8^&  
BOOL InitHotkey(); ngI3.v/R  
BOOL UnInit(); rf=ndjrH  
#endif ZW)_dg9  
tTcff9ee  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. n1J;)VyR  
#include "stdafx.h" q-|j =  
#include "hook.h" =s5g9n+7  
#include <windowsx.h> Z0#&D&2sV  
#ifdef _DEBUG nC2e^=^  
#define new DEBUG_NEW tS:/:0HnA)  
#undef THIS_FILE ,!7\?=G6}v  
static char THIS_FILE[] = __FILE__; Cyu= c1D;  
#endif fv+t%,++:  
#define MAX_KEY 100 {#C)S&o)6  
#define CTRLBIT 0x04 5[5|_H+0  
#define ALTBIT 0x02 0LD$"0v/C3  
#define SHIFTBIT 0x01 K2 b\9}  
#pragma data_seg("shareddata") Uuq*;L  
HHOOK hHook =NULL; On*pI37(\  
UINT nHookCount =0; kX)QHNzP  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Um2RLM%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT _6!@>`u~  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey &$L6*+`h#  
static int KeyCount =0; -J' 0qN!  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Zc|V7 +Yx  
#pragma data_seg() odsLFU(  
HINSTANCE hins; ,6AnuA  
void VerifyWindow(); U *K6FWqiB  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) VAnP3:  
//{{AFX_MSG_MAP(CHookApp) -~=?g9fGm6  
// NOTE - the ClassWizard will add and remove mapping macros here. "%E<%g  
// DO NOT EDIT what you see in these blocks of generated code! KbTd`AIL  
//}}AFX_MSG_MAP s9aa _Th  
END_MESSAGE_MAP() u/ZV35z  
J{qsCJiB  
CHookApp::CHookApp() [ @ASAhV^+  
{ Sk7sxy<F'  
 // TODO: add construction code here, /C\tJs  
 // Place all significant initialization in InitInstance |9Pi*)E  
} ;6AanwR6  
\S]` { kY,  
CHookApp theApp; YU,fx<c  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ] =*G[  
{ wT>~7$=L{  
 BOOL bProcessed=FALSE; -,a@bF:  
 if(HC_ACTION==nCode) 1<;RI?R[9  
 { T]UrKj/iF  
  if((lParam&0xc0000000)==0xc0000000){// Key up ,+GS.]8<  
   switch(wParam) j{&$_  
   { f~t5[D(\Q,  
    case VK_MENU: me  ,lE-  
     MaskBits&=~ALTBIT; $eiW2@  
     break; yE{\]j| Zf  
    case VK_CONTROL: OuMj%I  
     MaskBits&=~CTRLBIT; dC(5I{I|  
     break; =)YDjd_=z  
    case VK_SHIFT: FaQz03N\  
     MaskBits&=~SHIFTBIT; V:<Z   
     break; >QSlH]M  
    default: //judge the key and send message >1  %|T  
     break; twP%+/g]<  
   } }Yargj_Gn  
   for(int index=0;index<MAX_KEY;index++){ !%Bhg?  
    if(hCallWnd[index]==NULL) <i~=-Z(  
     continue; !D|c2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6]NaP_\0  
    { rd1EA|T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3-v&ktD&N'  
     bProcessed=TRUE; d J.up*aR  
    } P{+,?X\  
   } Mi)h<lY  
  } 8DGPA  
  else if((lParam&0xc000ffff)==1){ //Key down r)|6H"n#]S  
   switch(wParam) 8e"MP\0V  
   { 1YScZ  
    case VK_MENU: Nh[H[1"J  
     MaskBits|=ALTBIT; C Ef*:kr  
     break; l1%ubu  
    case VK_CONTROL: MGLcM&oR  
     MaskBits|=CTRLBIT; rH$M6S  
     break; @~&1!  
    case VK_SHIFT: b ,e"x48q  
     MaskBits|=SHIFTBIT; ~xt]g zp{  
     break; S{jm4LZ  
    default: //judge the key and send message i6P'_  
     break; p735i`8  
   } t03T1.:(Mg  
   for(int index=0;index<MAX_KEY;index++) 66{Dyn7J~  
   { Ia j`u  
    if(hCallWnd[index]==NULL) X:mm<4  
     continue; oer3DD(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I(uM`g  
    { 4w#:?Y _\[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 1Vx>\A  
     bProcessed=TRUE; U8OVn(qV  
    } \ 0/m$V.  
   } 3?Fe( !@  
  } -unQ 4G  
  if(!bProcessed){ m+QZ|  
   for(int index=0;index<MAX_KEY;index++){ cJ#n<Rsz  
    if(hCallWnd[index]==NULL) *r)dtI*  
     continue; I{i6e'.jP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }poLH S/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 1vinO!  
   } GG %*d]  
  } ^G14Z5.  
 } <9]J/w+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); eCjyx|:J  
} [&sabM`Ul  
K"cV7U rE  
BOOL InitHotkey() :Q ?p^OC  
{ &2r[4  
 if(hHook!=NULL){ + zf`_1+)U  
  nHookCount++; %gu|  
  return TRUE; C:.>*;?7  
 } M>ntldV#g%  
 else PkcvUJV  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 7U:{=+oLR  
  if(hHook!=NULL) v >cPr(  
   nHookCount++; L),r\#Y(v  
  return (hHook!=NULL); {__NVv  
} }b^x#HC  
BOOL UnInit() vG:S(/\>  
{ V;"Rp-`^  
 if(nHookCount>1){ mhI   
  nHookCount--; {7Hc00FM  
  return TRUE; 7c83g2|%   
 } F_@?'#m  
 BOOL unhooked = UnhookWindowsHookEx(hHook); vi]cl=S  
 if(unhooked==TRUE){ 63QF1*gPH  
  nHookCount=0; Q@[(0R1  
  hHook=NULL; CYYo+5x  
 } O-ppR7edh  
 return unhooked; oG\lejO  
} <B!DwMk;.  
NH4T*R)Vz  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1[!7xA0j  
{ :OV6R ,  
 BOOL bAdded=FALSE; [Pl''[  
 for(int index=0;index<MAX_KEY;index++){ B & ]GGy  
  if(hCallWnd[index]==0){ n7.85p@ua  
   hCallWnd[index]=hWnd; vs@u*4.Ut<  
   HotKey[index]=cKey; Y8c,+D,Ww  
   HotKeyMask[index]=cMask; [8&+4 <  
   bAdded=TRUE; cNMDI  
   KeyCount++; nF]zd%h  
   break; |>b;M ,`OO  
  } Cx&l0ZXHEX  
 } wQ8<%qi"L  
 return bAdded; [-Xah]g  
} Sa@T#%oU  
I~4!8W-Y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?kS#g  
{ `A<2wd;  
 BOOL bRemoved=FALSE; T(Ji%S >  
 for(int index=0;index<MAX_KEY;index++){ -/:K.SY,  
  if(hCallWnd[index]==hWnd){ QZJnb%]  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ O*%5P5'p"{  
    hCallWnd[index]=NULL; izu_1X  
    HotKey[index]=0; rdsZ[ii  
    HotKeyMask[index]=0; JAy-N bb\  
    bRemoved=TRUE; o .V JnrJ  
    KeyCount--; n. vrq-  
    break; Rm`P.;%  
   } TW}].A_-  
  } ^fE8|/]nG9  
 } IY|`$sHb  
 return bRemoved; `VF_rC[?  
} yb,$UT"]  
i(kx'ua?  
void VerifyWindow() <o/lK\>  
{ GI>(S  
 for(int i=0;i<MAX_KEY;i++){ [=cYsW%WG  
  if(hCallWnd!=NULL){ Awr(}){  
   if(!IsWindow(hCallWnd)){ @"H7Q1Hg!*  
    hCallWnd=NULL; 7~);,#[ky  
    HotKey=0; Eqi;m,)  
    HotKeyMask=0; pG22Nx  
    KeyCount--; JvNd'u)Z<  
   } 3p]\l ]=  
  } /qFY $vj  
 } = ?BhtW  
} 6 X'#F,M  
">Ms V/  
BOOL CHookApp::InitInstance() G cB<i  
{ pu_?) U  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ]x(6^:D5  
 hins=AfxGetInstanceHandle(); Dl,sl>{  
 InitHotkey(); Sj o-Xf}  
 return CWinApp::InitInstance(); LW#U+bv]Dq  
} +S'm<}"1  
8_pyfb  
int CHookApp::ExitInstance() nJ$2RN  
{ TpI8mDO\W  
 VerifyWindow(); FL4BdJ\  
 UnInit(); '6\ZgOO9  
 return CWinApp::ExitInstance(); p+0gE5  
} vy` lfbX@  
"H=N>=g0E  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^XG$?2<U  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Nw(hN+_u  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Qg0%r bE  
#if _MSC_VER > 1000 (" +clb`  
#pragma once {,1>(  
#endif // _MSC_VER > 1000 8 |Ob7+  
;j qF:Wl@  
class CCaptureDlg : public CDialog nM *}VI  
{ M+%qVwp  
 // Construction x U"g~hT  
 public: Pz\ByD  
  BOOL bTray; 4iZg2"[D  
  BOOL bRegistered; CugZ!>;^  
  BOOL RegisterHotkey(); ?9>wG7cps7  
  UCHAR cKey; R / ND f`  
  UCHAR cMask; kU#k#4X4g  
  void DeleteIcon(); 6:AEg  
  void AddIcon(); Af r*'  
  UINT nCount; O*Y?: t  
  void SaveBmp(); ].2t7{64  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor :4\%a4{Ie  
  // Dialog Data ";7/8(LBZ  
  //{{AFX_DATA(CCaptureDlg) f=.!/e70  
  enum { IDD = IDD_CAPTURE_DIALOG }; (F9e.QyWb  
  CComboBox m_Key; D!ASO]  
  BOOL m_bControl; $$EEhy  
  BOOL m_bAlt; 1Oq VV?oz  
  BOOL m_bShift; o+)y!  
  CString m_Path; L=fy!R  
  CString m_Number; ><xmw=  
  //}}AFX_DATA qz2`%8}F)  
  // ClassWizard generated virtual function overrides n5;@}Rai  
  //{{AFX_VIRTUAL(CCaptureDlg) 5Ar gM%  
 public: Z>3m-:-e  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 1.PN_9%  
 protected: ?\(qA+iP0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support m*YfbOhs#  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); FnI}N;"  
  //}}AFX_VIRTUAL #)@#Qd  
  // Implementation LbYIRX  
 protected: [9V}>kS)  
  HICON m_hIcon; B#+n$5#FK  
  // Generated message map functions +-9-%O.(;  
  //{{AFX_MSG(CCaptureDlg) D u T6Od/f  
  virtual BOOL OnInitDialog(); sv!v`zh  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?k($Tc&Q  
  afx_msg void OnPaint(); =F}qT|K  
  afx_msg HCURSOR OnQueryDragIcon(); sI h5cT  
  virtual void OnCancel(); Ul6|LTY  
  afx_msg void OnAbout(); [zXC\)&!  
  afx_msg void OnBrowse(); Gt _tL%  
  afx_msg void OnChange(); )l.uj  
 //}}AFX_MSG ^,F G 9  
 DECLARE_MESSAGE_MAP() qL`yaU  
}; w w[|| =  
#endif BkPt 1i  
H_Va$}8z  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file sINf/mv+  
#include "stdafx.h" LI&E.(:  
#include "Capture.h" 3 S*KjY'@  
#include "CaptureDlg.h" pKGhNIj$  
#include <windowsx.h> O[{/P:a  
#pragma comment(lib,"hook.lib") &/-MUKN  
#ifdef _DEBUG t;/uRN*.  
#define new DEBUG_NEW <m\<yZ2aa  
#undef THIS_FILE mBb3Ta  
static char THIS_FILE[] = __FILE__; iH@u3[w  
#endif nnvS.s`O  
#define IDM_SHELL WM_USER+1 !]Qk?T~9-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uK`gveY  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >d&0a:  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; D _[NzCv<-  
class CAboutDlg : public CDialog <SQR";  
{  "\T-r2  
 public: RgJbM\`} ?  
  CAboutDlg(); q5JQx**g  
  // Dialog Data 68(^*  
  //{{AFX_DATA(CAboutDlg) cruBJZr*  
  enum { IDD = IDD_ABOUTBOX }; ~d1=_p:~T  
  //}}AFX_DATA x X[WX#'f  
  // ClassWizard generated virtual function overrides XjP &  
  //{{AFX_VIRTUAL(CAboutDlg) b/Ma,}  
 protected: z wRF-{s  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8 hhMuh  
  //}}AFX_VIRTUAL z5 @i"%f  
  // Implementation _+nk3-yQw  
 protected: Tx]p4wY:D  
  //{{AFX_MSG(CAboutDlg) w{ |`F>f9  
  //}}AFX_MSG *s-s1v  
  DECLARE_MESSAGE_MAP() );_/0:  
}; oU @!R  
2+DK:T[  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) <|.]$QSi  
{ EJMd[hMhe  
 //{{AFX_DATA_INIT(CAboutDlg) r<Z.J/a  
 //}}AFX_DATA_INIT e`H>}O/ai  
} O[eU{ ;P  
X }i2qv  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) KdYR?rY  
{ & 0\:MJc  
 CDialog::DoDataExchange(pDX); Y`{62J8oy  
 //{{AFX_DATA_MAP(CAboutDlg) m@+QC$6S  
 //}}AFX_DATA_MAP mMOgx   
} * ?~"Jw  
M!mw6';k  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) qyFeq])  
 //{{AFX_MSG_MAP(CAboutDlg) Lu:*nJ%1[  
 // No message handlers bZ:+q1 D  
 //}}AFX_MSG_MAP d$x vEm  
END_MESSAGE_MAP() cYe2 a "  
u-s*k*VHoc  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ,}@4@ >?K  
: CDialog(CCaptureDlg::IDD, pParent) #NGtba  
{ 7&wxnxSk^  
 //{{AFX_DATA_INIT(CCaptureDlg) I{>Z0+  
  m_bControl = FALSE; :_:)S  
  m_bAlt = FALSE; +se OoTKR  
  m_bShift = FALSE; MBw;+'93qf  
  m_Path = _T("c:\\"); vu.?@k@  
  m_Number = _T("0 picture captured."); V*fv>f:Yv  
  nCount=0; .w@B )f*  
  bRegistered=FALSE; +Ek1~i.  
  bTray=FALSE; 9W]OtSG  
 //}}AFX_DATA_INIT 1n}#54  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 8> $=p4bf  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 9QB,%K_:4  
} _'1 ]CoR  
hY%} x5ntU  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) @mxaZ5Vv}  
{ (!N2,1|  
 CDialog::DoDataExchange(pDX); /SS~IhUX  
 //{{AFX_DATA_MAP(CCaptureDlg) J?X{NARt  
  DDX_Control(pDX, IDC_KEY, m_Key); fe`_0lxj  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); vzbGLap#  
  DDX_Check(pDX, IDC_ALT, m_bAlt); M  |h B[  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); j$XaO%y)  
  DDX_Text(pDX, IDC_PATH, m_Path); v=hn# U  
  DDX_Text(pDX, IDC_NUMBER, m_Number); xyM|q9Gf@  
 //}}AFX_DATA_MAP _h  \L6.  
} &Wb"/Hn2  
"u^vBd[}  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) <;W-!R759  
//{{AFX_MSG_MAP(CCaptureDlg) DCZG'eb  
 ON_WM_SYSCOMMAND() Y/I)ECm  
 ON_WM_PAINT() m%[/w wL  
 ON_WM_QUERYDRAGICON() AkW>*x  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) x3`JC&hF,q  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) *s" OqTM]x  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ",vK~m2W_  
//}}AFX_MSG_MAP #}@8(>T  
END_MESSAGE_MAP() 8q{|nH  
tu$rVwgM  
BOOL CCaptureDlg::OnInitDialog() DUl+Jqn4B  
{ ! }e75=x  
 CDialog::OnInitDialog(); 9_jiUZFje  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); M&29J  
 ASSERT(IDM_ABOUTBOX < 0xF000); o3|4PAA/  
 CMenu* pSysMenu = GetSystemMenu(FALSE); PH:5  
 if (pSysMenu != NULL) #X %!7tU6  
 { pU !:  
  CString strAboutMenu; y9R%%i  
  strAboutMenu.LoadString(IDS_ABOUTBOX); .N.RpRz{f  
  if (!strAboutMenu.IsEmpty()) #-f9>S9_  
  { ZYY2pY 1  
   pSysMenu->AppendMenu(MF_SEPARATOR); P*7G?  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Y Z8[h`z  
  } >K4Nn(~ys  
 } 0&I*)Zt9x  
 SetIcon(m_hIcon, TRUE); // Set big icon Ly^bP>2i  
 SetIcon(m_hIcon, FALSE); // Set small icon )D/ ,QWk  
 m_Key.SetCurSel(0); w}OBp^V^  
 RegisterHotkey(); cUG^^3!  
 CMenu* pMenu=GetSystemMenu(FALSE); F@q9UlfB-  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); /Mw;oP{&b  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); )fIG4#%\  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); umq6X8K  
 return TRUE; // return TRUE unless you set the focus to a control T* 0;3&sA  
} Keo<#Cc?  
hF@%k ;I  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) zng.(]U/?H  
{ ovM;6o  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 9D M,,h<`  
 { r5nHYV&7  
  CAboutDlg dlgAbout; gYrB@W; 2  
  dlgAbout.DoModal(); 9@ fSO<  
 } ] L#c <0  
 else Jh&DL8`  
 { M@h"FuX:  
  CDialog::OnSysCommand(nID, lParam); :n{{\SSIgX  
 } ~M H ^R1=]  
} L8h!%56s  
'fb\t,  
void CCaptureDlg::OnPaint() FI?J8a  
{ !i (V.A  
 if (IsIconic()) fi*b]a\'  
 { < B]qqqP  
  CPaintDC dc(this); // device context for painting "p;tj74O9  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); j xkQ #Y  
  // Center icon in client rectangle &uO-h  
  int cxIcon = GetSystemMetrics(SM_CXICON); 612,J  
  int cyIcon = GetSystemMetrics(SM_CYICON); F$ G)vskd  
  CRect rect; w*/@|r39  
  GetClientRect(&rect); =gR/ t@Ld  
  int x = (rect.Width() - cxIcon + 1) / 2; .0xk},  
  int y = (rect.Height() - cyIcon + 1) / 2;  cf,6";8  
  // Draw the icon `4xQ#K.-  
  dc.DrawIcon(x, y, m_hIcon); e<1Ewml(]  
 } ?G',Qtz<K  
 else tl!dRV92  
 { P%l?C?L  
  CDialog::OnPaint(); PcT]  
 } DMch88W  
}  \SQ4yc  
2[pOGc$  
HCURSOR CCaptureDlg::OnQueryDragIcon() SZrc-f_  
{ rYdNn0mh k  
 return (HCURSOR) m_hIcon; "xTVu57Z[  
} TS+jDs  
o jxK8_kl  
void CCaptureDlg::OnCancel() wH@S$WT  
{ Yu)GV7\2  
 if(bTray) {X?1}5ry  
  DeleteIcon(); )mOM!I7D@  
  CDialog::OnCancel(); BRY/[QRqZ  
} ><"|>(y  
]k]bLyz\J  
void CCaptureDlg::OnAbout() 3>L5TYa  
{ }MMKOr(  
 CAboutDlg dlg; L(Twclrb  
 dlg.DoModal(); %au>D  
} O-UA2?N@j  
y_n4Y[4g  
void CCaptureDlg::OnBrowse() svEe@Kt`  
{ ?32~%?m  
 CString str; Myg;2.  
 BROWSEINFO bi; g7hI9(8+  
 char name[MAX_PATH]; d{NMG)`x\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); S WTZ6(!oW  
 bi.hwndOwner=GetSafeHwnd(); %SIll  
 bi.pszDisplayName=name; ?K2EK'-q  
 bi.lpszTitle="Select folder"; t~K[`=G\ex  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 5ta;CG  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0F- +)S?M[  
 if(idl==NULL) PZJn/A1  
  return; T}Wbt=\M  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); u e  
 str.ReleaseBuffer(); P#!g P3  
 m_Path=str; m5N,[^-  
 if(str.GetAt(str.GetLength()-1)!='\\') )ADI[+KW  
  m_Path+="\\"; _MIheCvV  
 UpdateData(FALSE); n]4Elrxx  
} (#>X*~6  
Fyw X  
void CCaptureDlg::SaveBmp() u5rvrn ]  
{ ZaY|v-  
 CDC dc; <h#W*a  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); )ej1)RU"  
 CBitmap bm;  Hk4k  
 int Width=GetSystemMetrics(SM_CXSCREEN); |H^v8^%>zm  
 int Height=GetSystemMetrics(SM_CYSCREEN); nxuH22:  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Gq[5H(0/c  
 CDC tdc; !'# D~   
 tdc.CreateCompatibleDC(&dc); sDg1nKw(  
 CBitmap*pOld=tdc.SelectObject(&bm); 3p HI+a  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ?nL,Otz  
 tdc.SelectObject(pOld); L58H)V3Pn  
 BITMAP btm; 5p~5-_JX  
 bm.GetBitmap(&btm); p JF 9Z  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; eA]8M^  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); A*+gWn,4Y_  
 BITMAPINFOHEADER bih; }8}`A\ dgV  
 bih.biBitCount=btm.bmBitsPixel; Dl0{pGK~  
 bih.biClrImportant=0; \DE, ,  
 bih.biClrUsed=0; C"5P7F{  
 bih.biCompression=0; ;?iu@h  
 bih.biHeight=btm.bmHeight; @ls/3`E/5E  
 bih.biPlanes=1; fATVAv  
 bih.biSize=sizeof(BITMAPINFOHEADER); nJv=kk1|o  
 bih.biSizeImage=size; T<Y*();Zo  
 bih.biWidth=btm.bmWidth; 2<8l&2}7]  
 bih.biXPelsPerMeter=0; s1[.L~;J  
 bih.biYPelsPerMeter=0; ~e,l2 <  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ~cO iv  
 static int filecount=0; vdUKIP =|_  
 CString name; `IBNBJy  
 name.Format("pict%04d.bmp",filecount++); 5cA:;{z];g  
 name=m_Path+name; v]Pyz<+  
 BITMAPFILEHEADER bfh; R%2.N!8v  
 bfh.bfReserved1=bfh.bfReserved2=0; 7uw-1F5x7  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Z6Mjc/  
 bfh.bfSize=54+size; W)f=\.7  
 bfh.bfOffBits=54; vmNI$ KZM  
 CFile bf; j7w9H/XF}  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ n;=FD;}j+  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); l*wGKg"x3  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); I<<1mEk  
  bf.WriteHuge(lpData,size); *K?UWi#$  
  bf.Close(); L;?h)8  
  nCount++; M/[_~  
 } cQd?,B3#F  
 GlobalFreePtr(lpData); *v8daF  
 if(nCount==1) ,{(XT7hr  
  m_Number.Format("%d picture captured.",nCount); {*8G<&  
 else =6\^F i  
  m_Number.Format("%d pictures captured.",nCount); rZB='(?  
  UpdateData(FALSE); x.pg3mVd>  
} j$6Q]5KdoS  
,2FI?}+R  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) iE;F=Rb  
{ oVp/EQ  
 if(pMsg -> message == WM_KEYDOWN) 8#,_%<?UVy  
 { Au)~"N~p?  
  if(pMsg -> wParam == VK_ESCAPE) ` wj'  
   return TRUE; M(\{U"%@?  
  if(pMsg -> wParam == VK_RETURN) |XQ_4{  
   return TRUE; s}UJv\*  
 } QAo/d4  
 return CDialog::PreTranslateMessage(pMsg); u~ FVI  
} Oop6o $k  
zNo"P[J8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %{V7 |Azt  
{ Fo ;J3<U)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){  yoe@]c=  
  SaveBmp(); RSB+Saf.8  
  return FALSE; GJS(  
} wXnVQ-6H  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ H*N{4zBB  
 CMenu pop; iC!6g|]X  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 'ks  .TS&  
 CMenu*pMenu=pop.GetSubMenu(0); 6q`)%"4k  
 pMenu->SetDefaultItem(ID_EXITICON); WO!OaC?+B,  
 CPoint pt; _ 3>E+9TQ  
 GetCursorPos(&pt); 6M_ W(  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); w3b?i89  
 if(id==ID_EXITICON) y}={S,z%22  
  DeleteIcon(); ZO<\rX (  
 else if(id==ID_EXIT) OA}; pQ9QN  
  OnCancel(); ='1hvv/  
 return FALSE; j bT{K|d-  
} 6v%ePFul  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]^wr+9zd  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) If&y 5C  
 AddIcon(); %B1TN#KoT  
 return res; mv,a>Cvs[  
} T <k;^iqR  
D-i, C~W  
void CCaptureDlg::AddIcon() 6'uCwAQU  
{ aYc<C$:NC"  
 NOTIFYICONDATA data; b-<@3N.9]  
 data.cbSize=sizeof(NOTIFYICONDATA); 726UO#*  
 CString tip; 3PLA*n+%  
 tip.LoadString(IDS_ICONTIP); ,|z zq@fk  
 data.hIcon=GetIcon(0); Tz9 (</y  
 data.hWnd=GetSafeHwnd(); pJl/d;Cyrb  
 strcpy(data.szTip,tip); K(lVAKiP]  
 data.uCallbackMessage=IDM_SHELL; 8sI$  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; f2Xn!]o  
 data.uID=98; sc# EL~  
 Shell_NotifyIcon(NIM_ADD,&data); !z2xm3s{]p  
 ShowWindow(SW_HIDE); .tHc*Eh  
 bTray=TRUE; 7cB{Iq0+  
} E vY^]M_U  
0SIUp/.  
void CCaptureDlg::DeleteIcon() {<}Hut:a  
{ \WdSj  
 NOTIFYICONDATA data; x\:KfYr4Y;  
 data.cbSize=sizeof(NOTIFYICONDATA); br k*;  
 data.hWnd=GetSafeHwnd(); +`mI\+y,  
 data.uID=98; <rui\/4NJ  
 Shell_NotifyIcon(NIM_DELETE,&data); :w|=o9J  
 ShowWindow(SW_SHOW); Ets6tM`  
 SetForegroundWindow(); g6.I~o Q j  
 ShowWindow(SW_SHOWNORMAL); 't*]6^  
 bTray=FALSE; #k>A,  
} o >yXEg  
fiU#\%uJg  
void CCaptureDlg::OnChange() %`lJAW[  
{ |tLD^`bt  
 RegisterHotkey(); _.]mES|  
} pAA)?/&oKV  
]WcN6|b+  
BOOL CCaptureDlg::RegisterHotkey() w0H#M)c  
{ :1bDkoK  
 UpdateData(); )^6Os2  
 UCHAR mask=0; {;u+?uY  
 UCHAR key=0; (w(k*b/  
 if(m_bControl) AkO);4A;Jd  
  mask|=4; J 48$l(l3  
 if(m_bAlt)  [Ne'2z  
  mask|=2; ]Z=al`-  
 if(m_bShift) X$P(8'[9A  
  mask|=1; [[N${C  
  key=Key_Table[m_Key.GetCurSel()]; %" l;  
 if(bRegistered){ o#z$LT1dY  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); lt2MB#  
  bRegistered=FALSE; xA-?pLt "G  
 } i!RYrae  
 cMask=mask; GGhk`z  
 cKey=key; S^EAE]  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); rb'mFqg*u  
 return bRegistered; eq&QWxiD*  
} @}{uibLD\  
W|n$H`;R  
  四、小结 Z8Vof~  
n6Z!~W8  
  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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