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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: NY x4& *le  
  l1WVt}  
  一、实现方法 }R$%MU5::  
Hr$5B2'  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: sa*-B  
Gj3/&'k6  
#pragma data_seg("shareddata") 'Iu(lpF&  
HHOOK hHook =NULL; //钩子句柄 *OiHrI9y  
UINT nHookCount =0; //挂接的程序数目 wn`budH?c8  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 O5 SX"A  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?*,q#ZkA9W  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey v(`$%V.  
static int KeyCount =0; s3J$+1M >  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 vaL-Mi(_  
#pragma data_seg() M_K&x-H0  
]mSVjF3l  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ?L^ Gu ]y  
. {I7sUQ  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: =%LS9e^7D  
7Y/_/t~Y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR \m&:J >^  
cKey,UCHAR cMask) r DuG["  
{ Lrq&k40y  
 BOOL bAdded=FALSE; K4BMa]/U  
 for(int index=0;index<MAX_KEY;index++){ S[M$>  
  if(hCallWnd[index]==0){ |4vk@0L  
   hCallWnd[index]=hWnd; }_ E  
   HotKey[index]=cKey; Q"O _h  
   HotKeyMask[index]=cMask; A\`Uu&  
   bAdded=TRUE; F <(Y  
   KeyCount++; y+a&swd2(U  
   break; U*cj'`eqC  
  } 1a<~Rmcil  
 } 2 O%UT?R  
 return bAdded; dImm},  
} &!ZpBR(  
//删除热键 b11C3TyQT  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v;S JgZK  
{ sC>8[Jatd  
 BOOL bRemoved=FALSE; 2 E^P=jU`  
 for(int index=0;index<MAX_KEY;index++){ lgl/| ^ Uw  
  if(hCallWnd[index]==hWnd){ I,D=ixK  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2;/hFwm  
    hCallWnd[index]=NULL; k.%F!sK  
    HotKey[index]=0; vJ!t.Vou  
    HotKeyMask[index]=0; i|*:gH  
    bRemoved=TRUE; ]P.S5s'  
    KeyCount--; *h Ur E  
    break; 8QU`SoS9  
   }  l}JVRU{  
  } ~0L>l J  
 } JmkJ^-A 6  
 return bRemoved; d=[ .   
} @ o]F~x  
c c:xT0Y  
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  DLL中的钩子函数如下: 3XIxuQwf  
OX91b<A  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) gb-n~m[y  
{ d<]/,BY'  
 BOOL bProcessed=FALSE; )j](_kvK  
 if(HC_ACTION==nCode) V%))%?3x_  
 { @ B+];lr/-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 rVLA"x 9u  
   switch(wParam) E)Dik`Ccl  
   {  1*Z}M%  
    case VK_MENU: .$Y[>9  
     MaskBits&=~ALTBIT; B6BOy~B0  
     break; QFMS]  
    case VK_CONTROL: Z EW`?6  
     MaskBits&=~CTRLBIT; K|iNEhuc  
     break; rS=6d6@  
    case VK_SHIFT: B$)KZR(u  
     MaskBits&=~SHIFTBIT; `+U-oqs  
     break; Ab2VF;z :  
    default: //judge the key and send message _v-sb(* J  
     break; jsuQ R  
   } r_)*/  
   for(int index=0;index<MAX_KEY;index++){ # aC}\  
    if(hCallWnd[index]==NULL) x[]n\\a?  
     continue; M:ttzsd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sviGS&J9h  
    { 9rhz#w  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); bp }~{]:b  
     bProcessed=TRUE; 17-K~ybc  
    } mV-MJ$3r  
   } Ba"Z^(:  
  } t ,0~5>5  
  else if((lParam&0xc000ffff)==1){ //有键按下 g%K3ah v  
   switch(wParam) JWLQ9U X  
   { ;(z0r_p<q  
    case VK_MENU: c Mq|`CM  
     MaskBits|=ALTBIT; iKu5K0x{>I  
     break; {L#Pdj{  
    case VK_CONTROL: h>4\I;Ij  
     MaskBits|=CTRLBIT; XWkYhTaY  
     break; HR4^+x  
    case VK_SHIFT: (u *-(  
     MaskBits|=SHIFTBIT; $#CkI09  
     break; VQ +Xh  
    default: //judge the key and send message %.]qkGZe#  
     break; ~GZ(Ou-&  
   } y8\44WKW  
   for(int index=0;index<MAX_KEY;index++){ &",pPu q  
    if(hCallWnd[index]==NULL) %GJ, &b|  
     continue; B7cXbUAQs  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) By" =]|Q  
    { }_K7}] 1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); l/SbJrM*  
     bProcessed=TRUE; Kpg]b"9.R  
    } |@Bl?Bs+  
   } 'En6h"{  
  } t'^/}=c-  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ]2?t $"G8  
   for(int index=0;index<MAX_KEY;index++){ Z O&5C6qa  
    if(hCallWnd[index]==NULL) =YR/|9(  
     continue; `U)~fu/\2M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }yUZ(k#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); XJ.vj+XXb  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 <Dl7|M  
   } nT:ZSJWM  
  } L\pe  
 } <`BUk< uf#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); O3Yv ->#  
} XJGOX n$/  
?,]25q   
  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: oTZNW  
JBp^@j{_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /.P*%'g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); < f1Pj  
Y7 = *-  
  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: sk 9*3d5I  
LEG y1L  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p"w"/[8  
{ f Vw+8[d0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) $`mxOcBmQ  
 { >osY?9  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 +[ !K  
  SaveBmp(); LyH{{+V  
  return FALSE; -|T.APxB  
 } F8f@^LVM/  
 …… //其它处理及默认处理 c5pF?kFaD  
} &0~E+ 9b  
Pr9$( 6MX  
= oQ-I  
  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。 Y`w+?}(M  
_uID3N%  
  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。 {U>B\D  
qy"#XbBeV  
  二、编程步骤 V|)3l7IC<  
(i1 ]+.  
  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"; tRFj<yuaq  
jUYb8:B  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; # 2s$dI  
7?xTJN)G  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; NZ7g}+GTG  
m\RU |Z  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; s7[du_)  
eNR>W>;'  
  5、 添加代码,编译运行程序。 `;L>[\Xi  
ihdN{Mx<2  
三、程序代码 Y:XE4v/)@L  
/0IvvD!7N  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL HTA Jn_  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) e<#t]V  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ (w}iEm\b  
#if _MSC_VER > 1000 )[i0~o[  
#pragma once LY(YgqL  
#endif // _MSC_VER > 1000 W{<_gD9  
#ifndef __AFXWIN_H__  R5(<:]  
#error include 'stdafx.h' before including this file for PCH !`JaYUL[e  
#endif m r&nB  
#include "resource.h" // main symbols gs7h`5[es  
class CHookApp : public CWinApp Dyyf%'\M  
{ jhl9  
 public: Bvb.N$G  
  CHookApp(); h\k@7wgu  
  // Overrides .5 Sw  
  // ClassWizard generated virtual function overrides F jsnFX;  
  //{{AFX_VIRTUAL(CHookApp) tJ;<=.n  
 public: K-vG5t0$\/  
  virtual BOOL InitInstance(); fMgB!y"Em  
  virtual int ExitInstance(); -^yb[b,  
  //}}AFX_VIRTUAL CY"&@v1  
  //{{AFX_MSG(CHookApp) ssj(-\5  
  // NOTE - the ClassWizard will add and remove member functions here. 78T9"CS  
  // DO NOT EDIT what you see in these blocks of generated code ! lV<2+Is  
  //}}AFX_MSG LQ(z~M0B  
  DECLARE_MESSAGE_MAP() ~gg(i"V  
}; o`,|{K$H  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); fyaiRn9/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6aRPm%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bis}zv^%v  
BOOL InitHotkey(); LhO%^`vu  
BOOL UnInit(); kV9S+ME  
#endif dNK Q&TC  
Y>W$n9d&G2  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. o}O"  
#include "stdafx.h" Jas=D  
#include "hook.h" FOz~iS\  
#include <windowsx.h> u_ou,RF  
#ifdef _DEBUG S{wR Z|8U  
#define new DEBUG_NEW bS7rG$n [  
#undef THIS_FILE S5'ZKk  
static char THIS_FILE[] = __FILE__; ~QzUQYG*  
#endif nK[T.?Nz  
#define MAX_KEY 100 jd ]$U_U(  
#define CTRLBIT 0x04 J'{69<`Dl  
#define ALTBIT 0x02 |[qq $  
#define SHIFTBIT 0x01 x \0( l5>  
#pragma data_seg("shareddata") {EU?{ #  
HHOOK hHook =NULL; z B/#[~  
UINT nHookCount =0; ,t?c=u\5  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Zcst$Aro  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT  =ie8{j2:  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Lxz!>JO>  
static int KeyCount =0; qTxw5.Ai!  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift cC@.&  
#pragma data_seg() 0oR'"Vo  
HINSTANCE hins; A)v! {  
void VerifyWindow(); yR}PC/>  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) f+3ico]f@  
//{{AFX_MSG_MAP(CHookApp) &ed&2t`Y  
// NOTE - the ClassWizard will add and remove mapping macros here. p=13tQS<  
// DO NOT EDIT what you see in these blocks of generated code! P}kBqMM  
//}}AFX_MSG_MAP 3%HF"$Gg  
END_MESSAGE_MAP() EY+/ foP  
8d4:8}  
CHookApp::CHookApp() 4sJM!9eb[  
{ -o: if F|  
 // TODO: add construction code here, 'OEh'\d+x  
 // Place all significant initialization in InitInstance i*ibx;s-  
} Z:_ wE62'  
!W\Zq+^^J3  
CHookApp theApp; cl\Gh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) uO]^vP]fT  
{ 7 k:w3M  
 BOOL bProcessed=FALSE; 8&K1;l }  
 if(HC_ACTION==nCode) Ebk9[=  
 { TTGk"2 Q'  
  if((lParam&0xc0000000)==0xc0000000){// Key up "Sx}7?8AB  
   switch(wParam) y&A0}>a:d  
   { oY NIJXln  
    case VK_MENU: l  rRRRR  
     MaskBits&=~ALTBIT; g<b(q|  
     break; [-Xz:  
    case VK_CONTROL: Uw`YlUT\  
     MaskBits&=~CTRLBIT; J)kH$!csi  
     break; F R57F(31  
    case VK_SHIFT: @$:T]N3m  
     MaskBits&=~SHIFTBIT; cpY'::5.%  
     break; p-CBsm5P  
    default: //judge the key and send message WRdBL5  
     break; $~^Y4 } m  
   } <t~RGn3  
   for(int index=0;index<MAX_KEY;index++){ k 'CM^,F&  
    if(hCallWnd[index]==NULL) O\~/J/u <  
     continue; ^k#.;Q#4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }^b7x;O|  
    { 5>S=f{ghFw  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ng0tNifZ;  
     bProcessed=TRUE; --D&a;CO}  
    } A,H|c="  
   } _0GM!Cny  
  } (B/od#nU  
  else if((lParam&0xc000ffff)==1){ //Key down W~W `fm  
   switch(wParam) k_,wa]ws$  
   { "J.7@\^ h/  
    case VK_MENU: 7NQ@q--3s  
     MaskBits|=ALTBIT; Q85Y6',  
     break; [\_#n5  
    case VK_CONTROL: 'L k& iph  
     MaskBits|=CTRLBIT; 9e aqq  
     break; n "J+? ~9  
    case VK_SHIFT: !EwL"4pPw  
     MaskBits|=SHIFTBIT; #E'aa'P}  
     break; (9!/bX<  
    default: //judge the key and send message v,eTDgw  
     break; jsp)e=  
   } 7RpAsLH=  
   for(int index=0;index<MAX_KEY;index++) U07 G&? /  
   { tJ qd  
    if(hCallWnd[index]==NULL) u*h+ c8|zI  
     continue; {e/6iSpT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \>7hT;Av=G  
    { hRc.^"q9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); )8,)&F  
     bProcessed=TRUE; Sd9%tO9mf  
    } (>)f#t[9J  
   } U%PII>s'#  
  } ~#]$YoQ&O  
  if(!bProcessed){ 3Yb2p!o  
   for(int index=0;index<MAX_KEY;index++){ ZH s' #  
    if(hCallWnd[index]==NULL) th4yuDPuA  
     continue; ,ve$bSp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Zqp<8M2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [V2`t'  
   } 8T]x4JQ0  
  } pD@2Mt0|]=  
 } _yH=w'8.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +k?0C?/T;  
} {y\5 9  
_=g;K+%fb  
BOOL InitHotkey() yG/_k !{9  
{ =QG0:z)K<v  
 if(hHook!=NULL){ {=Y3[  
  nHookCount++; Vi:<W0:  
  return TRUE; )a;ou>u  
 } vR*TW   
 else S-Z s  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); &pk&8_=f  
  if(hHook!=NULL) [BLBxSL  
   nHookCount++; 4UV6'X)V  
  return (hHook!=NULL); uK!G-1   
} } N$soaUs  
BOOL UnInit() YT@D*\  
{ Dpf"H  
 if(nHookCount>1){ .$s>b#mO  
  nHookCount--; [m+):q^  
  return TRUE; rL9u7) x  
 } ?*K{1Ghf  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 4\rwJD<  
 if(unhooked==TRUE){ M#'j7EMu  
  nHookCount=0; MmL)CT  
  hHook=NULL; m .':5  
 } uB*Y}"Fn  
 return unhooked; up^D9(y\  
} S +mM S  
pf%B  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *y@Xm~ld  
{ sSdnH_;&  
 BOOL bAdded=FALSE; 84|oqwZO  
 for(int index=0;index<MAX_KEY;index++){ 3mCf>qj73  
  if(hCallWnd[index]==0){ VKtZyhK"h  
   hCallWnd[index]=hWnd; qTV;L-  
   HotKey[index]=cKey; gq`S`  
   HotKeyMask[index]=cMask; kaUEv\T   
   bAdded=TRUE; &40# _>W7  
   KeyCount++; y$h.k"x`  
   break; #|ILeby  
  } R4 x!b`:i  
 } K4`)srd  
 return bAdded; nS$_VJ]~  
} O dWZYWj  
+C8yzMN\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~IhLjE  
{ $T-Pl57  
 BOOL bRemoved=FALSE; 9cMQ51k)E  
 for(int index=0;index<MAX_KEY;index++){ hALg5.E{T  
  if(hCallWnd[index]==hWnd){ /ZpwJc`e  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +Dwq>3AH  
    hCallWnd[index]=NULL; 8gK  <xp  
    HotKey[index]=0; B*c@w~E  
    HotKeyMask[index]=0; 4eh~/o&h  
    bRemoved=TRUE; W5c?f,  
    KeyCount--; :IB@@5r1  
    break; s(u,mtG  
   } k  __MYb  
  } NB@TyU  
 } #eZm)KFQg  
 return bRemoved; [i 7^a/e  
} Zp'q;h_  
K>_~zWnc  
void VerifyWindow()  |tVWmm^m  
{ c1>:|D7w  
 for(int i=0;i<MAX_KEY;i++){ J4VyP["m  
  if(hCallWnd!=NULL){ )h>H}wDs  
   if(!IsWindow(hCallWnd)){ .r4M]1Of  
    hCallWnd=NULL; rV[/G#V>{  
    HotKey=0; 5+yT{,(5  
    HotKeyMask=0; =|Vm69  
    KeyCount--; 4n 9c  
   } b>_eD-  
  } -z6{!  
 } e4rhB"qQdn  
} 3{"MN=  
K H&o`U(}  
BOOL CHookApp::InitInstance() R'e>YDC  
{ <{"Jy)Uf  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); '}pe$=  
 hins=AfxGetInstanceHandle(); H-ewO8@  
 InitHotkey(); R|OY5@  
 return CWinApp::InitInstance(); :.J]s<J(F  
} "'zVwU  
N |nZf5{  
int CHookApp::ExitInstance() +[C><uP  
{ \'[C_+;X  
 VerifyWindow(); .R! /?eN  
 UnInit(); S)L(~ N1  
 return CWinApp::ExitInstance();  L4 )  
} 1nAAs;`'  
23_\UTM}1  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Dc;zgLLL  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7 8n`VmH~L  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ l<"Z?z  
#if _MSC_VER > 1000 ~IIlCmMl,  
#pragma once r{1xjAT  
#endif // _MSC_VER > 1000 vf-cx\y7  
WN`|5"?$  
class CCaptureDlg : public CDialog 2J0N]`|)  
{ *$/!.e  
 // Construction iM'rl0  
 public: z($h7TZ$  
  BOOL bTray; )(`HEl>-9c  
  BOOL bRegistered; n+qa/<  
  BOOL RegisterHotkey(); _G1C5nkDl4  
  UCHAR cKey; *\4u:1Cu  
  UCHAR cMask; 2Ysl|xRo  
  void DeleteIcon(); ZBcT@hxm  
  void AddIcon(); @b2JR^  
  UINT nCount; VHlo}Ek<#  
  void SaveBmp(); `j1(GQt  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?V >{3  
  // Dialog Data ;c;5O@R}3  
  //{{AFX_DATA(CCaptureDlg) ouO<un  
  enum { IDD = IDD_CAPTURE_DIALOG }; AC& }8w[>u  
  CComboBox m_Key; FXd><#U  
  BOOL m_bControl; i<>zN^zn  
  BOOL m_bAlt; p^/6Rb"e  
  BOOL m_bShift; #lo1GoL\  
  CString m_Path; 8H<:?D/tH  
  CString m_Number; Zwm2T3@e  
  //}}AFX_DATA ~SD8#;v2  
  // ClassWizard generated virtual function overrides |',$5!:0O  
  //{{AFX_VIRTUAL(CCaptureDlg) R[Y{pT,AY  
 public: o n+:{ad  
  virtual BOOL PreTranslateMessage(MSG* pMsg); JS{trqc1d  
 protected: .*acw  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support NJ];Ck  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); z:a%kZQ!0  
  //}}AFX_VIRTUAL XZ1oV?Z4  
  // Implementation W:V:Ej7 h  
 protected: uFH ]w] X  
  HICON m_hIcon; r)Dln5F  
  // Generated message map functions ImZ!8#  
  //{{AFX_MSG(CCaptureDlg) )e6)~3[^  
  virtual BOOL OnInitDialog(); _Vl22'wl  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); WY3D.z-</  
  afx_msg void OnPaint(); yWkg4  
  afx_msg HCURSOR OnQueryDragIcon(); Wd78 bu|  
  virtual void OnCancel(); "PhP1;A9,  
  afx_msg void OnAbout(); kH9P(`;Vq  
  afx_msg void OnBrowse(); "pLWJvj6-  
  afx_msg void OnChange(); )*tV  
 //}}AFX_MSG WD${f#]N  
 DECLARE_MESSAGE_MAP() V\4zK$]  
}; =MCQNyf+  
#endif ;kv/(veQ1<  
[n!5!/g>j  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file XI"8d.VR  
#include "stdafx.h" K[/sVaPZ  
#include "Capture.h" [8OQ5}do/  
#include "CaptureDlg.h" U`w `Cr  
#include <windowsx.h> 6^vseVx  
#pragma comment(lib,"hook.lib") Yj-JB  
#ifdef _DEBUG 5:W 5@e{  
#define new DEBUG_NEW `N.^+Mvx-  
#undef THIS_FILE I C?bqC+  
static char THIS_FILE[] = __FILE__; $-Wn|w+h<a  
#endif {~u#.(  
#define IDM_SHELL WM_USER+1 m?4L>'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); brXLx +H8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); dvLO#o{  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; KDQqN]rg  
class CAboutDlg : public CDialog Rx,Qw> #  
{ <[W41{  
 public: -<MA\iSP  
  CAboutDlg(); QgZ`~  
  // Dialog Data ljJi|+^$  
  //{{AFX_DATA(CAboutDlg) A\IQM^i  
  enum { IDD = IDD_ABOUTBOX }; zJ9[),;7B  
  //}}AFX_DATA kafRuO~$  
  // ClassWizard generated virtual function overrides ^xZo .P  
  //{{AFX_VIRTUAL(CAboutDlg) oI2YJ2?Je8  
 protected: pA|Z%aL  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support F4T}HY>nZ  
  //}}AFX_VIRTUAL '1u!@=.\G  
  // Implementation I]dt1iXu_{  
 protected:  I0v$3BQ4  
  //{{AFX_MSG(CAboutDlg) .>A`FqV$~+  
  //}}AFX_MSG [@RJ2q$  
  DECLARE_MESSAGE_MAP() N~/D| ?P~2  
}; NrTK+6 z  
e_iXR#bZc  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) yi-S^  
{ =:~%$5[[  
 //{{AFX_DATA_INIT(CAboutDlg) }g@5%DI]  
 //}}AFX_DATA_INIT PRo;NE  
} Uw:gJ 9  
SmR"gu  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Y%"6  
{ @2HNYW)  
 CDialog::DoDataExchange(pDX); Ta 0Ln  
 //{{AFX_DATA_MAP(CAboutDlg) 4PsJs<u  
 //}}AFX_DATA_MAP RXZ}aX[h  
} n:i?4'-}  
H[S 4o,  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4IEF{"c_8  
 //{{AFX_MSG_MAP(CAboutDlg) g*uo2-MN&e  
 // No message handlers gXzp$#  
 //}}AFX_MSG_MAP :fW\!o 8Z2  
END_MESSAGE_MAP() c/bIt  
d 6$,N|  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) $: %U`46%s  
: CDialog(CCaptureDlg::IDD, pParent) Ln2dD>{2  
{ O5;$cP:  
 //{{AFX_DATA_INIT(CCaptureDlg) luYa+E0  
  m_bControl = FALSE; LBs:O*;  
  m_bAlt = FALSE; afJ`1l  
  m_bShift = FALSE; rEl bzL"&<  
  m_Path = _T("c:\\"); 7G^`'oZ  
  m_Number = _T("0 picture captured."); c(tX761qz  
  nCount=0; E@%X  
  bRegistered=FALSE; w)u6J ,  
  bTray=FALSE; AnUOv 2  
 //}}AFX_DATA_INIT ,*Vt53@E  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Q:/BC= ~  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); F N)vFQ#J  
} hj8S#  
/!//i^  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 7j <:hF~  
{ k'hJ@ 6eKS  
 CDialog::DoDataExchange(pDX); Gx.iZOOH/  
 //{{AFX_DATA_MAP(CCaptureDlg) !VF.=\iH/  
  DDX_Control(pDX, IDC_KEY, m_Key); g/2eY$6Z  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); :Jz@`s1n  
  DDX_Check(pDX, IDC_ALT, m_bAlt); AzwG_XgM)  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ML|O2e  
  DDX_Text(pDX, IDC_PATH, m_Path); [kjmEMF9i  
  DDX_Text(pDX, IDC_NUMBER, m_Number); SW^/\cJ^  
 //}}AFX_DATA_MAP .@(+.G  
} @\_l%/z{  
GdxMHnn=  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) "AAzBWd/  
//{{AFX_MSG_MAP(CCaptureDlg) qxR7;/@j)  
 ON_WM_SYSCOMMAND() XKTX~:  
 ON_WM_PAINT() 0i4 X,oHjG  
 ON_WM_QUERYDRAGICON() ?'I[[KuG  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) i5QG_^X&  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) gp/_# QVWC  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Ki"o0u  
//}}AFX_MSG_MAP $xWebz0  
END_MESSAGE_MAP() :())%Xu3  
qg(rG5kD@  
BOOL CCaptureDlg::OnInitDialog() h)vRvfcmY  
{ f"8!uE*;  
 CDialog::OnInitDialog(); JDIQpO"Qji  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); &$!'Cw`,  
 ASSERT(IDM_ABOUTBOX < 0xF000); J#pl7q)^w  
 CMenu* pSysMenu = GetSystemMenu(FALSE); m)]A$*`<  
 if (pSysMenu != NULL) ~BSE8M+r  
 { bkZ~O=uv$-  
  CString strAboutMenu; )kq3q5*_  
  strAboutMenu.LoadString(IDS_ABOUTBOX); )7H s  
  if (!strAboutMenu.IsEmpty()) ;g0p`wV  
  { g7-=kmr|V  
   pSysMenu->AppendMenu(MF_SEPARATOR); %Q0J$eC  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Bx>)i8P7i0  
  } yLo{^4a.  
 } ##6_kcL:6G  
 SetIcon(m_hIcon, TRUE); // Set big icon X)tf3M {J@  
 SetIcon(m_hIcon, FALSE); // Set small icon \U1fUrw$*  
 m_Key.SetCurSel(0); s /? &H-  
 RegisterHotkey(); \; b)qB  
 CMenu* pMenu=GetSystemMenu(FALSE); 6"d^4L?  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); H| uvcvf  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ~sI$xX!  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ]lKQ wpX3  
 return TRUE; // return TRUE unless you set the focus to a control *TjolE~o  
} -\.'WZo`  
A=v^`a03I  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 5g{L -8XwI  
{ `3v! i   
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) I^5T9}>Q  
 { ]G0`W6;$]  
  CAboutDlg dlgAbout; YEEgDw]BQ  
  dlgAbout.DoModal();  QTN _Z#'  
 } '}`|QJ  
 else V ifQ@  
 { /<HEcB  
  CDialog::OnSysCommand(nID, lParam); Y[A`r0  
 } =s2dD3Fr|  
} A1zqm_X5)P  
HlkG^:)  
void CCaptureDlg::OnPaint() 2^Tj@P7  
{ ]m#.MZe  
 if (IsIconic()) C3H q&TVf/  
 { QFI8|i@  
  CPaintDC dc(this); // device context for painting ,C#Mf@b  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); x<0-'EF/S  
  // Center icon in client rectangle G%a8'3d,  
  int cxIcon = GetSystemMetrics(SM_CXICON); kH!I&4d&  
  int cyIcon = GetSystemMetrics(SM_CYICON); hLVS}HE2  
  CRect rect; h48JpZ"  
  GetClientRect(&rect); :J3ZTyjb  
  int x = (rect.Width() - cxIcon + 1) / 2; x4PH-f-7  
  int y = (rect.Height() - cyIcon + 1) / 2; n\nC.|_G@  
  // Draw the icon Q9lw~"  
  dc.DrawIcon(x, y, m_hIcon); %f{1u5+5  
 } d2Z kchf  
 else Y4%Bx8  
 { +DWmutL  
  CDialog::OnPaint(); 9I a4PPEH1  
 } ?G5JAG`  
} .b4_O CGg  
9.KOrg5}L  
HCURSOR CCaptureDlg::OnQueryDragIcon() :qV}v2  
{ 1_Um6vS#  
 return (HCURSOR) m_hIcon; TJ:B_F*bSk  
} OHqc,@a;+  
\haJe~  
void CCaptureDlg::OnCancel() $c-h'o  
{ dbkkx1{>Y  
 if(bTray) Q0K4_iN)&  
  DeleteIcon(); 00') Ol&  
  CDialog::OnCancel(); )`RF2Y-A7  
} `"0#lZ`n  
C+r<DC3  
void CCaptureDlg::OnAbout() Y",Fs(  
{ z$3 3NM  
 CAboutDlg dlg; Y$%/H"1bk  
 dlg.DoModal(); 73$^y)AvY  
} 4:\s.Z{!3  
r( _9_%[  
void CCaptureDlg::OnBrowse() +\FTR  
{ x1m J&D  
 CString str; EDR;" G(N  
 BROWSEINFO bi; ta>:iQ a  
 char name[MAX_PATH]; DWB.dP *8  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); d}K"dr:W5  
 bi.hwndOwner=GetSafeHwnd(); SRl:+!@.  
 bi.pszDisplayName=name; |-N\?N9"  
 bi.lpszTitle="Select folder"; &zsaVm8  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; K2T&U$ ,  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); *p;Fwj]  
 if(idl==NULL) 1}e1:m]r  
  return; #zC_;u$  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); .:tAZZ  
 str.ReleaseBuffer(); *rO#UE2  
 m_Path=str; Y`S9mGR#  
 if(str.GetAt(str.GetLength()-1)!='\\') +/60$60[z  
  m_Path+="\\"; j2T Z`Z?a^  
 UpdateData(FALSE); 4h>Dpml  
} tBgB>-h(  
:CO>g=`  
void CCaptureDlg::SaveBmp() >]q{vKCAP  
{ hKw4[wB]  
 CDC dc; 4K82%P9a  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); R07Kure  
 CBitmap bm; w/r wE  
 int Width=GetSystemMetrics(SM_CXSCREEN); U2=l; R{  
 int Height=GetSystemMetrics(SM_CYSCREEN); ,K Ebnk|i  
 bm.CreateCompatibleBitmap(&dc,Width,Height);  Z(p kj  
 CDC tdc; }EmNSs`$r  
 tdc.CreateCompatibleDC(&dc); SxLu<  
 CBitmap*pOld=tdc.SelectObject(&bm); gc-yUH0I  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); #%U5,[<a8  
 tdc.SelectObject(pOld); _tZT  
 BITMAP btm; WL4{_X  
 bm.GetBitmap(&btm); f&glY`s#  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; `;-K/)/x  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 7aVQp3<  
 BITMAPINFOHEADER bih; 1hj']#vBu  
 bih.biBitCount=btm.bmBitsPixel; zhH-lMNj-  
 bih.biClrImportant=0; 1u&}Lq(  
 bih.biClrUsed=0; w66iLQ\@  
 bih.biCompression=0; @b\/\\{  
 bih.biHeight=btm.bmHeight; YaJ[39V  
 bih.biPlanes=1; K!6k<  
 bih.biSize=sizeof(BITMAPINFOHEADER); G(F }o]  
 bih.biSizeImage=size; w,dDA2,  
 bih.biWidth=btm.bmWidth; !|{T>yy  
 bih.biXPelsPerMeter=0; 6q ._8%  
 bih.biYPelsPerMeter=0; ${^WM}N  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); w-l:* EV8  
 static int filecount=0; yTWP1  
 CString name; )Xxu-/-  
 name.Format("pict%04d.bmp",filecount++); !6: kJL}U  
 name=m_Path+name; RiC1lCE  
 BITMAPFILEHEADER bfh; LutP&Ebt8  
 bfh.bfReserved1=bfh.bfReserved2=0; "ewSh<t  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Fyy)665x/  
 bfh.bfSize=54+size; V|3}~(5=  
 bfh.bfOffBits=54; !6hUTjhW7z  
 CFile bf; _,:gSDW|  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ VSa\X~  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?sV0T)uk  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,$ L>  
  bf.WriteHuge(lpData,size); )%lPa|7s  
  bf.Close(); [V_Z9-f*  
  nCount++; bhaIi>W~G  
 } T!C39T  
 GlobalFreePtr(lpData); \EF^Ag  
 if(nCount==1) 4$ LVl  
  m_Number.Format("%d picture captured.",nCount); G9ku(2cq  
 else ca/AScL  
  m_Number.Format("%d pictures captured.",nCount); BwwOaO@L  
  UpdateData(FALSE); SW|{)L,  
} 25%[nkO4  
[F4] pR(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) fQcJyX  
{ CAdqoCz|  
 if(pMsg -> message == WM_KEYDOWN) %"|I` m  
 { s Wk92x _l  
  if(pMsg -> wParam == VK_ESCAPE) $eUI.j(HU  
   return TRUE; $_NYu  
  if(pMsg -> wParam == VK_RETURN) K[JbQ30  
   return TRUE; 5 s3!{zT{  
 } 5[3vu p?  
 return CDialog::PreTranslateMessage(pMsg); a"gZw9m@  
} H1iewsfzH  
U_ELeW5@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >5Y%4++(  
{  ,83%18b  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?5(Cwy ?  
  SaveBmp(); z+IBy+  
  return FALSE; w.w(*5[  
} YCr:nYm<f  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 7 lc -  
 CMenu pop; g,Z8I;A^  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); (Tt\6-  
 CMenu*pMenu=pop.GetSubMenu(0); CX/ _\0 G4  
 pMenu->SetDefaultItem(ID_EXITICON); d>[=]  
 CPoint pt; H/"$#8-/  
 GetCursorPos(&pt); (/TYET_H  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); xwK{}==U  
 if(id==ID_EXITICON) 3Au3>q,  
  DeleteIcon(); SPfz/ q{  
 else if(id==ID_EXIT) / i[F  
  OnCancel(); C;]}Ht:~I  
 return FALSE; lezX-5Z  
} tnL$v2e6q  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); r'!L}^n  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) h= tzG KI  
 AddIcon(); Z4 y9d?g%b  
 return res; D@@J7  
} SVKjhZK  
bzYj`t?  
void CCaptureDlg::AddIcon() LY Y3*d  
{ 9yla &XTD  
 NOTIFYICONDATA data; 3%gn:.9N  
 data.cbSize=sizeof(NOTIFYICONDATA); DJ)Q,l*|N9  
 CString tip; MvV\?Lzj   
 tip.LoadString(IDS_ICONTIP); f@Oi$9CZn  
 data.hIcon=GetIcon(0); FI|jsO 3  
 data.hWnd=GetSafeHwnd(); cQM_kV??!  
 strcpy(data.szTip,tip); E6+c{41B  
 data.uCallbackMessage=IDM_SHELL; wD+4#=/j  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &c[.&L,w4  
 data.uID=98; k# -u!G  
 Shell_NotifyIcon(NIM_ADD,&data); ndW]S7  
 ShowWindow(SW_HIDE); )LOV)z|}  
 bTray=TRUE; t!^ j0q  
} "u29| OY  
:(7icHa  
void CCaptureDlg::DeleteIcon() (%p@G5GU  
{ f_\,H|zco)  
 NOTIFYICONDATA data; w)xiiO[  
 data.cbSize=sizeof(NOTIFYICONDATA); L>xecep  
 data.hWnd=GetSafeHwnd(); FFC"rG  
 data.uID=98; ~)ut"4  
 Shell_NotifyIcon(NIM_DELETE,&data); >~_oSC)E  
 ShowWindow(SW_SHOW); {\:"OcP #  
 SetForegroundWindow(); >+}yI}W;e  
 ShowWindow(SW_SHOWNORMAL);  mE1m  
 bTray=FALSE; j >pv@D  
} )?d(7d-l  
Qdt4h$~V"  
void CCaptureDlg::OnChange() 3+:F2sjt  
{ s>pM+PoGYd  
 RegisterHotkey(); J  ZH~ {  
} hB[VU ";  
|azdFf6A:[  
BOOL CCaptureDlg::RegisterHotkey()  ylTX  
{ r@WfZ  Z  
 UpdateData(); ]*/%5ZOI&  
 UCHAR mask=0; sKu/VAh x  
 UCHAR key=0; P]h-**O  
 if(m_bControl) g/3t@7*<  
  mask|=4; <D}yqq@|  
 if(m_bAlt) |FED<  
  mask|=2; 4eD>DW  
 if(m_bShift) =[_=y=G  
  mask|=1; qS|ns'[  
  key=Key_Table[m_Key.GetCurSel()]; UO~Xzx!e  
 if(bRegistered){ /9QC$Z):<  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); /&>vhpZ}  
  bRegistered=FALSE; ,M?K3lG\g[  
 } *OM+d$l!  
 cMask=mask; OdSglB  
 cKey=key; Sm5 T/&z  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); BQo$c~  
 return bRegistered; b+/z,c6w  
} PNgdWf3  
S:= _o  
  四、小结 A WS[e$Mt2  
nNc>nB1  
  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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