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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: G"<#tif9K  
  hC\ l \y  
  一、实现方法 ( s3k2Z  
E!9WZY  
  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: k H.dtg_  
r:g\  
#pragma data_seg("shareddata") FCE y1^u  
HHOOK hHook =NULL; //钩子句柄 %~!4DXrMk  
UINT nHookCount =0; //挂接的程序数目 1+FVM\<&  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 d?fS#Ryb  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 iW` tr  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Ln h =y2  
static int KeyCount =0; PK[mf\G\  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ojd0um6I{  
#pragma data_seg() ybBmg'198  
{18hzhs  
  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。 tMxd e+ $y  
ZxF`i>/h  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: (P|[< Sd  
s;VW %e  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR &<F9Z2^  
cKey,UCHAR cMask)  <mn[-  
{ N p"p*O  
 BOOL bAdded=FALSE; I&1Lm)W&  
 for(int index=0;index<MAX_KEY;index++){ YYe G9yR  
  if(hCallWnd[index]==0){ lz,M$HG<[  
   hCallWnd[index]=hWnd; xi5"?*&Sb  
   HotKey[index]=cKey; <V&0GAZ  
   HotKeyMask[index]=cMask; oYqH l1cs  
   bAdded=TRUE; U^dfNi@q  
   KeyCount++; XY"b90  
   break; d0(zB5'}  
  } E4 X6f  
 } y:;.r:  
 return bAdded; @2>UR9j  
} F/oqYk9`  
//删除热键 q1}!Okr"2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b84l`J  
{ yvd)pH<a2  
 BOOL bRemoved=FALSE; =]7o+L4  
 for(int index=0;index<MAX_KEY;index++){ p!UR;xHI\  
  if(hCallWnd[index]==hWnd){ ALMsF2H  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ o2!738  
    hCallWnd[index]=NULL; K<>kT4  
    HotKey[index]=0; e5' I W__  
    HotKeyMask[index]=0; [}L~zn6>?a  
    bRemoved=TRUE; HRf;bKZ  
    KeyCount--; FNQ<k[#K'~  
    break; }+@9[Q L  
   } MAek856  
  } o"VKAP  
 } |}=eY?iXo  
 return bRemoved; "_WN[jm  
} #3&@FzD_P  
_ Sr}3  
Ge q]wv8  
  DLL中的钩子函数如下: !..<_qfw  
y[_k/.1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) _;HdX$op  
{ '(vZfzc{J  
 BOOL bProcessed=FALSE; oIhKMQ;jh  
 if(HC_ACTION==nCode) ?bZH Aed  
 { ,Z{\YAh1  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 8b/$Qp4d  
   switch(wParam) YG\#N+D  
   {  [IYVrT&C'  
    case VK_MENU: c1f"z1Z  
     MaskBits&=~ALTBIT; 0 +=sBk (  
     break; NqD]p{>Y  
    case VK_CONTROL: tV)CDA&Z  
     MaskBits&=~CTRLBIT; zgb$@JC  
     break; '_c/CNs  
    case VK_SHIFT: %Ig$:I(o  
     MaskBits&=~SHIFTBIT; ]oGd,v X  
     break; Y1PR?c Q  
    default: //judge the key and send message bzi"7%c  
     break; "Rj PTRe:  
   } <[dcIw<7  
   for(int index=0;index<MAX_KEY;index++){ & zDuh[j}  
    if(hCallWnd[index]==NULL) f.6>6%l  
     continue; dNe!X0[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]C \+b <  
    { )?rq8VO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); B>2R-pa4~  
     bProcessed=TRUE; Q"&Mr+  
    } V*?cMJ_G  
   } R"t#dG]1t  
  } .QvD603%5  
  else if((lParam&0xc000ffff)==1){ //有键按下 m+c-"arIpA  
   switch(wParam) $)M3fZ$#  
   { )iN;1>  
    case VK_MENU: YmV/[{  
     MaskBits|=ALTBIT; Hx.|5n,5  
     break; Q|_F P:  
    case VK_CONTROL: ~]KdsT(=_  
     MaskBits|=CTRLBIT; digc7;8L  
     break; JxVGzb`8  
    case VK_SHIFT:  Vl_6nY;  
     MaskBits|=SHIFTBIT; !Tnjha*  
     break; }1#m+ (;  
    default: //judge the key and send message Hv;xaT<}V  
     break; GHv6UIe&  
   } x=*&#; Y|  
   for(int index=0;index<MAX_KEY;index++){ *Soi  
    if(hCallWnd[index]==NULL) Tz,-~mc  
     continue; 5Kzt8Tv[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {Ze Y:\G~  
    { Fd9[Pe@?`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); U^PXpNQ'  
     bProcessed=TRUE; 3%POTAw%  
    } Y|tHU'x  
   } x{R440"  
  } "| nXR8t.r  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 j yHa}OT  
   for(int index=0;index<MAX_KEY;index++){  S!?T0c?>  
    if(hCallWnd[index]==NULL) :;%Jm  
     continue; V(S7mA:T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pCKP{c=6Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); + <bj}"  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 YSnh2 Bq  
   } L.;b( bFe  
  } XM]m%I  
 } vXKL<  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); hUMG}<  
} C*Q7@+&  
JH?ohA  
  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: Cv#aBH'N  
T~UDD3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s$fM,l:!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1Yb&E7j  
NpVL;6?7T  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: k{*EoV[.$  
d@3DsE.{i  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) l,@>J9}Se  
{ N#u'SGTG  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 5EtR>Pc  
 { h"[B zX  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 cK$yr)7  
  SaveBmp(); r5j$FwY  
  return FALSE; G$C2?|V)=  
 } S1=P-Ao  
 …… //其它处理及默认处理 xw*e`9vAe  
} <F3{-f'Rx  
%H\b5& _y  
R0?bcP&  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 t'_EcYNS  
{6u)EJ  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 J^8j|%h%e  
#S7oW@  
  二、编程步骤 >LPb>t5%p  
'aNkU  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Pt"K+]Ym  
h8V*$  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ,:Px(=d4  
;+75"=[YT  
  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; 2IYzc3Z{9  
g9C ; JmU  
  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; 75\ZD-{T:  
y [McdlH m  
  5、 添加代码,编译运行程序。 ;lmg0dtJ  
m=}h7&5p  
三、程序代码 hj];a,Br&  
aImzK/  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL )"TVR{I%B  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) rxp|[>O<  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ C^q|(G)  
#if _MSC_VER > 1000 Jt$YSp=!!  
#pragma once YKe&Ph.  
#endif // _MSC_VER > 1000 -mJs0E*g  
#ifndef __AFXWIN_H__ a 4?A 5  
#error include 'stdafx.h' before including this file for PCH kF1$  
#endif x}2nn)fdZ  
#include "resource.h" // main symbols SkDr4kds  
class CHookApp : public CWinApp @!iS`u  
{ (MXy\b<  
 public: Oti;wf G7o  
  CHookApp(); W B:0}b0Gu  
  // Overrides xh;gAh5n  
  // ClassWizard generated virtual function overrides W'6DwV|  
  //{{AFX_VIRTUAL(CHookApp) jI,[(Z>  
 public: %; &lVIU0  
  virtual BOOL InitInstance(); &S="]*Z  
  virtual int ExitInstance(); HQ+{9Z8 ?5  
  //}}AFX_VIRTUAL L;:|bVH  
  //{{AFX_MSG(CHookApp) T#*,ME7|m  
  // NOTE - the ClassWizard will add and remove member functions here. fTEZ@#p  
  // DO NOT EDIT what you see in these blocks of generated code ! yl$Ko  
  //}}AFX_MSG 1ZF KLI`V  
  DECLARE_MESSAGE_MAP() !w7/G  
};  r(^00hvH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); |?KYY0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); D:k< , {  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); fV+a0=Z  
BOOL InitHotkey(); "'5(UiSFz  
BOOL UnInit(); =R0f{&"i  
#endif C2<TR PT  
.qE  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 7c_2.T@4  
#include "stdafx.h" 9swHa  
#include "hook.h" NFVu~t  
#include <windowsx.h> ltOS()[X  
#ifdef _DEBUG g:uVl;>  
#define new DEBUG_NEW J *LPv9)  
#undef THIS_FILE !$n@:W/  
static char THIS_FILE[] = __FILE__; bofI0f}5.  
#endif TqJ @l  
#define MAX_KEY 100 `:'ciY|%b  
#define CTRLBIT 0x04 }wo:1v8J  
#define ALTBIT 0x02 ,?LE5]  
#define SHIFTBIT 0x01 <^nS%hXEr  
#pragma data_seg("shareddata") Q7y' 0s  
HHOOK hHook =NULL; '$,yV f  
UINT nHookCount =0; KY&Lv^1_|  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey |}{gE=]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT POk5+^  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey =.s0"[%   
static int KeyCount =0; pwMA,X/{  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ln_&Ux+l  
#pragma data_seg() <Ve0PhK  
HINSTANCE hins; /@ em E0  
void VerifyWindow(); Qw_uwQZ)  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) >-c?+oy  
//{{AFX_MSG_MAP(CHookApp) 9{(q[C5m  
// NOTE - the ClassWizard will add and remove mapping macros here. }S iR;2W  
// DO NOT EDIT what you see in these blocks of generated code! 1{/Cr K/o  
//}}AFX_MSG_MAP cQ1[x>OcU  
END_MESSAGE_MAP() 4!14: mq  
<5L99<E  
CHookApp::CHookApp() 'LoWp} f9  
{ dQ;8,JzIw&  
 // TODO: add construction code here, >4@w|7lS  
 // Place all significant initialization in InitInstance g]j&F65D  
} ~AWn 1vFc  
`BZ|[ q3  
CHookApp theApp; *& w/*h$!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) pku\)  
{ N!.o`4 "z  
 BOOL bProcessed=FALSE; BqJ|l7+  
 if(HC_ACTION==nCode) 5ppr;QaB  
 { UD14q~ (1Z  
  if((lParam&0xc0000000)==0xc0000000){// Key up =m<b+@?T  
   switch(wParam) io\t>_  
   { EkV#i  
    case VK_MENU: :Xy51p`.;]  
     MaskBits&=~ALTBIT; NcbW"Qv3  
     break; Lp%J:ogV`  
    case VK_CONTROL: (6/aHSXI  
     MaskBits&=~CTRLBIT; V9/2y9u  
     break; ,#N}Ni:  
    case VK_SHIFT: B _ J2Bf  
     MaskBits&=~SHIFTBIT; e 6wevK\  
     break; @ddCVxd  
    default: //judge the key and send message LawE 3CD  
     break; K!AA4!eUzM  
   } ?o)?N8U  
   for(int index=0;index<MAX_KEY;index++){ uj)vh  
    if(hCallWnd[index]==NULL) BZv:E?1z  
     continue; u~,hT Y(%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0B[~j7EGO  
    { G5|nt#>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); v~x`a0  
     bProcessed=TRUE; c)Ng9p  
    } cGs& Kn;h  
   } PE;<0Cz\  
  } ){mqo%{SO  
  else if((lParam&0xc000ffff)==1){ //Key down >'#vC]@  
   switch(wParam) P#3J@aRC  
   { N[-$*F,:_  
    case VK_MENU: uo?R;fX26  
     MaskBits|=ALTBIT; HjzAFXRG  
     break; qsEFf(9G  
    case VK_CONTROL: KtJc9dnX  
     MaskBits|=CTRLBIT; jHob{3  
     break; Mi NEf  
    case VK_SHIFT: `_.:O,^n^  
     MaskBits|=SHIFTBIT; y%9Hu  
     break; [c;0eFSi2  
    default: //judge the key and send message 63'% +  
     break; cjtcEW  
   } > {d9z9O  
   for(int index=0;index<MAX_KEY;index++) ]2ab~ gr  
   { ;TC]<N.YJT  
    if(hCallWnd[index]==NULL) [ Y{  
     continue; SnX)&>B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ``]NB=N}{1  
    { ltrti.&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); w_"-rGV  
     bProcessed=TRUE; ) iV^rLwL  
    } #lik: ?  
   } UdcV<#  
  } P}=n^*8(I  
  if(!bProcessed){ N,8.W"fV  
   for(int index=0;index<MAX_KEY;index++){ E|oOd<z  
    if(hCallWnd[index]==NULL) {|0YcL  
     continue; 9*~";{O.Oa  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *yHz#u'  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); R4b!?}d  
   } *Cp:<M nd  
  } ffI=Bt]t  
 } d%L/[.&  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2zbn8tO  
} J!|R1  
InRRcn(  
BOOL InitHotkey() M%$ITE  
{ h'GOO(  
 if(hHook!=NULL){ uwi.Sg11  
  nHookCount++; 4Q1R:Ra  
  return TRUE; , ExY.'%1  
 } 0,&] 2YJ  
 else Jq"3xj   
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); !K2QD[x  
  if(hHook!=NULL) BbCW3!(  
   nHookCount++;  jrS$!cEo  
  return (hHook!=NULL); :}q)]W  
} M<= e~';H  
BOOL UnInit() (]?M=?0\  
{ *Jt+-ZM  
 if(nHookCount>1){ LEN=pqGJ.  
  nHookCount--; /V2yLHm  
  return TRUE; s^.tj41Gx}  
 } o*E32#l  
 BOOL unhooked = UnhookWindowsHookEx(hHook); OaT]2o  
 if(unhooked==TRUE){ }fef*>>}  
  nHookCount=0; X>pCkGE  
  hHook=NULL; #RyTa /L  
 } )Pc>+} D  
 return unhooked; 2[1t )EW  
} hhWy-fP#  
p Djt\R<f  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) y\CxdTs  
{ 9GT}_ ^fb  
 BOOL bAdded=FALSE; Gr}NgyT<!D  
 for(int index=0;index<MAX_KEY;index++){ B+jh|@-  
  if(hCallWnd[index]==0){ 8$RiFD ,  
   hCallWnd[index]=hWnd; B>I :KGkV  
   HotKey[index]=cKey; _d^d1Q}V  
   HotKeyMask[index]=cMask; I(k(p\l%  
   bAdded=TRUE; $tc1 te  
   KeyCount++; *5XOYb?'v.  
   break; xDPR^xY  
  } ?|Z~mE  
 } UxF9Ko( ]d  
 return bAdded; sV0NDM0  
} $*:$-  
w/PE)xA  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Lr d-  
{ II=!E  
 BOOL bRemoved=FALSE; VV 54$a  
 for(int index=0;index<MAX_KEY;index++){ 9pr.`w  
  if(hCallWnd[index]==hWnd){ f)Y~F/[$P  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :AQ9-&i/a-  
    hCallWnd[index]=NULL; 0`v-pL0|  
    HotKey[index]=0; #Jp|Cb<qx  
    HotKeyMask[index]=0; =w:)AWZ  
    bRemoved=TRUE; o9C# 5%9  
    KeyCount--; OTAe#]#  
    break; A@:U|)+4  
   } 6]?W&r|0I  
  } l&kZ6lZ  
 } k=d0%} `M(  
 return bRemoved; V[Sj+&e&  
} #_K<-m%9  
K3WaBcm  
void VerifyWindow() _7qa~7?f  
{ RE D@|[Qh  
 for(int i=0;i<MAX_KEY;i++){ YdIZikF#  
  if(hCallWnd!=NULL){ 19[!9ci  
   if(!IsWindow(hCallWnd)){ MZWv#;.]  
    hCallWnd=NULL; 8^_e>q*W  
    HotKey=0; fz8 41 <Y  
    HotKeyMask=0; B~@Gfb>`'  
    KeyCount--; Jp^#G2  
   } }L%2K"8?}  
  } f+1'Ah0'E  
 } p*T[(\8{n  
} BG.sHI{  
Z.x]6  
BOOL CHookApp::InitInstance() f<|*^+  
{ 3zc;_U2  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Jt<J#M<}7  
 hins=AfxGetInstanceHandle(); \~Ml<3Zd:  
 InitHotkey(); XIdC1%pr;  
 return CWinApp::InitInstance(); ?<\2}1  
} g>gf-2%Uo  
b5KK0Jjk  
int CHookApp::ExitInstance() to1r 88X  
{ l[%=S!  
 VerifyWindow(); Lp4F1H2t-  
 UnInit(); 1{a4zGE?[  
 return CWinApp::ExitInstance(); p8?"}  
} nqTOAL9FF  
z[O*f#t  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file vCK+v r!  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) k{hNv|:,  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ BnDCK@+|Q  
#if _MSC_VER > 1000 ""_G4{  
#pragma once GZn=Hgv8  
#endif // _MSC_VER > 1000 K_:2sDCaN  
|b^UPrz)VS  
class CCaptureDlg : public CDialog $A/?evJi8R  
{ a"t~ K  
 // Construction 4%_xT o  
 public: 4vvQ7e7  
  BOOL bTray; R(8?9-w  
  BOOL bRegistered; ma<uXq  
  BOOL RegisterHotkey(); 6R$Yh0%  
  UCHAR cKey; o-AF_N  
  UCHAR cMask; ;+#Nb/M  
  void DeleteIcon(); 7`^Y*:(  
  void AddIcon(); rKT.~ZP\  
  UINT nCount; ">20`Mj8  
  void SaveBmp(); _%\%  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 6-g>(g   
  // Dialog Data A;&YPHB  
  //{{AFX_DATA(CCaptureDlg) /EegP@[  
  enum { IDD = IDD_CAPTURE_DIALOG }; "!eq~/nk  
  CComboBox m_Key; @t*D<B$  
  BOOL m_bControl; $ e,r>tgD  
  BOOL m_bAlt; j+q)  
  BOOL m_bShift; cD)9EFo  
  CString m_Path; AGjjhbGB  
  CString m_Number; >ZeARCf"f  
  //}}AFX_DATA E $W0HZ'  
  // ClassWizard generated virtual function overrides .)p%|A#^  
  //{{AFX_VIRTUAL(CCaptureDlg) -AolW+Y  
 public: y9LO;{(  
  virtual BOOL PreTranslateMessage(MSG* pMsg); M&gi$Qs[E  
 protected: T/ eX7p1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support WSv%Rxr8L  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); $;~YgOVZ5  
  //}}AFX_VIRTUAL P|p X F~  
  // Implementation =K|#5p`  
 protected: rl$"~/ oz  
  HICON m_hIcon; ^,5%fl  
  // Generated message map functions #`K{vj  
  //{{AFX_MSG(CCaptureDlg) ue@W@pj  
  virtual BOOL OnInitDialog(); iWFtb)3B  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); >ke.ZZV?  
  afx_msg void OnPaint(); `_i|\}tl  
  afx_msg HCURSOR OnQueryDragIcon(); 5ug|crX  
  virtual void OnCancel(); j(K)CHH  
  afx_msg void OnAbout(); FU J<gqL  
  afx_msg void OnBrowse(); rwio>4=  
  afx_msg void OnChange(); L%<]gJtrO  
 //}}AFX_MSG [F;\NJp6?^  
 DECLARE_MESSAGE_MAP() mE>{K  
}; E`hR(UL ?  
#endif euRKYGW  
x2r.4  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file W\5 -Yg(@  
#include "stdafx.h" mpVD;)?JmM  
#include "Capture.h" %;= ?r*]  
#include "CaptureDlg.h" 3;wiwN'  
#include <windowsx.h> Q>9bKP  
#pragma comment(lib,"hook.lib") {.[EXMX  
#ifdef _DEBUG 4GG>n  
#define new DEBUG_NEW #n15_cd  
#undef THIS_FILE =n_z`I  
static char THIS_FILE[] = __FILE__; ,oSn<$%/q  
#endif XzqB=iX  
#define IDM_SHELL WM_USER+1 YktZXc?iI<  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); C]l)Pz$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bmi",UZ:F  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; yHlQKI  
class CAboutDlg : public CDialog ) j&khHD  
{ `L[q`r7  
 public: v^F00@2I  
  CAboutDlg(); V[]Pya|s+  
  // Dialog Data 8O60pB;4  
  //{{AFX_DATA(CAboutDlg) E?bv<L,"  
  enum { IDD = IDD_ABOUTBOX }; oSf`F1;)HQ  
  //}}AFX_DATA |:4?K*w",  
  // ClassWizard generated virtual function overrides ],~[^0  
  //{{AFX_VIRTUAL(CAboutDlg) 8faT@J'e;  
 protected: $ <C",&  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !<VP[%2L~  
  //}}AFX_VIRTUAL 2Ub-ufkU  
  // Implementation *A8Et5HAv  
 protected: l{ql'm  
  //{{AFX_MSG(CAboutDlg) :RJo#ape  
  //}}AFX_MSG j6$@vA)  
  DECLARE_MESSAGE_MAP() Qy}pn=#Q  
}; i+< v7?:`#  
WPlf8* -fQ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) /vi Ic %=  
{ pR=R{=}wV  
 //{{AFX_DATA_INIT(CAboutDlg) A{k1MA<F6  
 //}}AFX_DATA_INIT \*qradgx$  
} NjA[(8\:  
WS(m#WFQr  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) f8=qnY2j  
{ G(Hr*T%  
 CDialog::DoDataExchange(pDX); v.vkQQ0[9  
 //{{AFX_DATA_MAP(CAboutDlg) + ZiYl[_|  
 //}}AFX_DATA_MAP m .(\u?J  
} m_Z(osoE#W  
u^c/1H:6  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) X eY[;}9  
 //{{AFX_MSG_MAP(CAboutDlg) { D|ST2:E  
 // No message handlers ; lrO?sm  
 //}}AFX_MSG_MAP CR2.kuM0~  
END_MESSAGE_MAP() eT5IL(mH  
H\E%.QIx  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) v<)&JlR  
: CDialog(CCaptureDlg::IDD, pParent) |O'*CCrCL  
{ M"{*))O\-c  
 //{{AFX_DATA_INIT(CCaptureDlg) tq@)J_7|  
  m_bControl = FALSE; 8fBhX,1  
  m_bAlt = FALSE; #f_'&m  
  m_bShift = FALSE; h6<i,1gQ1  
  m_Path = _T("c:\\"); '@w'(}3!3R  
  m_Number = _T("0 picture captured."); f}4A ,%:1  
  nCount=0; 2J$vX(  
  bRegistered=FALSE; BhbfPQ  
  bTray=FALSE; *=v%($~PK6  
 //}}AFX_DATA_INIT w^ofH-R/  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 aaN/HE_  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ePIN<F;I  
} ydY 7 :D  
a.JjbFL  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) |22vNt_  
{ V EsM  
 CDialog::DoDataExchange(pDX); t l7:L>  
 //{{AFX_DATA_MAP(CCaptureDlg) 9n_Rk W5g  
  DDX_Control(pDX, IDC_KEY, m_Key); h05FR[</  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); *)I^+zN  
  DDX_Check(pDX, IDC_ALT, m_bAlt); >+.GBf<E  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); iS<1C`%>  
  DDX_Text(pDX, IDC_PATH, m_Path); UWS 91GN@  
  DDX_Text(pDX, IDC_NUMBER, m_Number);  iycceZ  
 //}}AFX_DATA_MAP OT=1doDp  
} Xo[cpcV  
nR@mm j  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) E]g6|,4~-  
//{{AFX_MSG_MAP(CCaptureDlg) 8\:>;XG6f  
 ON_WM_SYSCOMMAND() LikCIO  
 ON_WM_PAINT() %{cVG-<_iz  
 ON_WM_QUERYDRAGICON() yM9>)SE5`  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) *b 0z/ 6  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) )\2KDXc  
 ON_BN_CLICKED(ID_CHANGE, OnChange) C"0 VOb  
//}}AFX_MSG_MAP }U5$~, *p  
END_MESSAGE_MAP() QHUFS{G ]  
3&{6+A  
BOOL CCaptureDlg::OnInitDialog() 'W54 T  
{ Fs=x+8'M  
 CDialog::OnInitDialog(); vkR ~nIp  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); !Y7$cU &  
 ASSERT(IDM_ABOUTBOX < 0xF000); y!R9)=/M  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 4MW oGV9  
 if (pSysMenu != NULL) _K'Y`w']  
 { \+Y=}P>  
  CString strAboutMenu; ;pOV; q3j  
  strAboutMenu.LoadString(IDS_ABOUTBOX); KD+&5=Y  
  if (!strAboutMenu.IsEmpty()) mJ5%+.V  
  { Iw( wT_  
   pSysMenu->AppendMenu(MF_SEPARATOR); Knb(MI6  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); b2[U3)|oO  
  } hgE :2@  
 } Fn4yx~0  
 SetIcon(m_hIcon, TRUE); // Set big icon @]}/vsI m  
 SetIcon(m_hIcon, FALSE); // Set small icon i!3*)-a\~`  
 m_Key.SetCurSel(0); oAB:H \  
 RegisterHotkey(); Le bc @,  
 CMenu* pMenu=GetSystemMenu(FALSE); r)Zk-!1  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); `/N={  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); t:P]bp^#  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); uW/>c$*)  
 return TRUE; // return TRUE unless you set the focus to a control _nxu8g]  
} C0Fd<|[  
QkHG`yW  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) =ONM#DxH  
{ *mWl=J;u  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) gN[t  
 { rLmc(-q  
  CAboutDlg dlgAbout; ~!7x45( 1#  
  dlgAbout.DoModal(); ZHeq)5C ;f  
 } ;/?w-)n?  
 else 6|3 X*Orn  
 { NRT]dYf"z  
  CDialog::OnSysCommand(nID, lParam); M}CxCEdDB]  
 } !Yn#3c  
} 6w m-uu  
D/4]r@M2c  
void CCaptureDlg::OnPaint() Q2woCx B  
{ Lpkx$QZ  
 if (IsIconic()) ~EXCYUp4v  
 { 'X6Y!VDd  
  CPaintDC dc(this); // device context for painting S'ms>ZENC  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); HUCJA-OZGL  
  // Center icon in client rectangle >py[g0J  
  int cxIcon = GetSystemMetrics(SM_CXICON); d^!3&y&  
  int cyIcon = GetSystemMetrics(SM_CYICON); 5_L,7\5#  
  CRect rect; vZ$E [EG}  
  GetClientRect(&rect); VGxab;#,:3  
  int x = (rect.Width() - cxIcon + 1) / 2; .j|uf[?h  
  int y = (rect.Height() - cyIcon + 1) / 2; VQG$$McJ  
  // Draw the icon @H+L1H%9n  
  dc.DrawIcon(x, y, m_hIcon); 9(z) ^ G  
 } [E6ceX0  
 else e00 }YWf%  
 { _G.!^+)kEm  
  CDialog::OnPaint(); Ef ?|0Gm  
 } lVd-{m)  
} ; 2V$`k  
!hS)W7!ik  
HCURSOR CCaptureDlg::OnQueryDragIcon() OU#p^ 5K  
{ 94t`&jZ&|u  
 return (HCURSOR) m_hIcon; 5=<KA   
} ~$j;@ 4  
A<TYt M  
void CCaptureDlg::OnCancel() Yh@2m9  
{ g&EK^q  
 if(bTray) |4 2;171  
  DeleteIcon(); _29wQn@]  
  CDialog::OnCancel(); "XLtrAu{  
} ~%M*@ fm  
shy[>\w  
void CCaptureDlg::OnAbout() U@n5:d=  
{ z\8s |!  
 CAboutDlg dlg; :Mh\;e  
 dlg.DoModal(); /cUu]#h  
} +_bxza(ma{  
JEWc{)4QD  
void CCaptureDlg::OnBrowse() aot2F60J,  
{ @V5i  
 CString str; @H~oOf  
 BROWSEINFO bi; `"yxmo*0  
 char name[MAX_PATH]; Iu`S0#+  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); En\q. 3 5  
 bi.hwndOwner=GetSafeHwnd(); ^q& |7Ou-  
 bi.pszDisplayName=name; PE/uB,Wl  
 bi.lpszTitle="Select folder"; P?n4B \!  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 7I&o  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 7l =Tl[n  
 if(idl==NULL) ~OvbMWu  
  return; N3MPW  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); +S-60EN*A  
 str.ReleaseBuffer(); 6vps`k$,~  
 m_Path=str; =>evkaj  
 if(str.GetAt(str.GetLength()-1)!='\\') mXS]SE  
  m_Path+="\\"; U/cj_}uX  
 UpdateData(FALSE); jV%=YapF  
} ]o0]i<:  
WvfM.D!  
void CCaptureDlg::SaveBmp() cS:O|R#%t  
{ UpE +WzY  
 CDC dc; ^?sP[;8S!  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); F.1u9)   
 CBitmap bm; S^p^) fAmF  
 int Width=GetSystemMetrics(SM_CXSCREEN); TBO g.y]  
 int Height=GetSystemMetrics(SM_CYSCREEN); ZnzO]  
 bm.CreateCompatibleBitmap(&dc,Width,Height); EStui>ho  
 CDC tdc; CxJ3u  
 tdc.CreateCompatibleDC(&dc); w{k^O7~  
 CBitmap*pOld=tdc.SelectObject(&bm); }S?"mg& V  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Z[] 8X@IPe  
 tdc.SelectObject(pOld); / j%~#@  
 BITMAP btm; TecMQ0 KD  
 bm.GetBitmap(&btm); *l"CIG'  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; zn&ZXFgN  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); w%X@os}E  
 BITMAPINFOHEADER bih; GbZ~e I`,2  
 bih.biBitCount=btm.bmBitsPixel; /je $+  
 bih.biClrImportant=0; 8-k`"QI=  
 bih.biClrUsed=0; ^ +@OiL>&i  
 bih.biCompression=0; kN{$-v=K  
 bih.biHeight=btm.bmHeight; ~OR^  
 bih.biPlanes=1; A?}[rM Z  
 bih.biSize=sizeof(BITMAPINFOHEADER); !vpXXI4  
 bih.biSizeImage=size; Cj`~ntMN  
 bih.biWidth=btm.bmWidth; <Z.{q Zd  
 bih.biXPelsPerMeter=0; !QbuOvw  
 bih.biYPelsPerMeter=0; t1J3'lS  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); i\b^}m8c.N  
 static int filecount=0; [+R_3'aK  
 CString name; X;UEq]kcmn  
 name.Format("pict%04d.bmp",filecount++); e`LkCy[_  
 name=m_Path+name; _Y]Oloo('  
 BITMAPFILEHEADER bfh; %,HUn`  
 bfh.bfReserved1=bfh.bfReserved2=0; j3`YaWw  
 bfh.bfType=((WORD)('M'<< 8)|'B'); hi/d%lNZ  
 bfh.bfSize=54+size; MMpId Uhr  
 bfh.bfOffBits=54; _ A# lyp  
 CFile bf; FJCORa@?_  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ GK1nGdT]  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Y*\h?p[,  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8IxIW0  
  bf.WriteHuge(lpData,size); & /T}  
  bf.Close(); m;>G]Sbe  
  nCount++; <Lxp t  
 } w{xa@Q]t-  
 GlobalFreePtr(lpData); !o?&{"#+  
 if(nCount==1) jIrfJ*z  
  m_Number.Format("%d picture captured.",nCount); $':5uU1}  
 else T|D^kL%m!  
  m_Number.Format("%d pictures captured.",nCount); ty"L&$bf  
  UpdateData(FALSE); Z4As'al  
} %cUC~, g_(  
jn ztCNaX  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]cS(2hP7  
{ a)=|{QR>W  
 if(pMsg -> message == WM_KEYDOWN) (?^F }]  
 { ^p9V5o  
  if(pMsg -> wParam == VK_ESCAPE) F!u)8>s+z{  
   return TRUE; IO 0nT  
  if(pMsg -> wParam == VK_RETURN) 1y1:<t  
   return TRUE; 'kC#GTZi  
 } "T^%HPif  
 return CDialog::PreTranslateMessage(pMsg); rCczQ71W  
} ,VEE<* 'X  
ZX`x9/0&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .xmB8 R  
{ N '&>bO?@`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ^9LoxU-  
  SaveBmp(); oA~0"}eS  
  return FALSE; _/}$X"4  
} r*$f^T!|  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ %k['<BYG<  
 CMenu pop; E#8|h(  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); S hy.:XI  
 CMenu*pMenu=pop.GetSubMenu(0); .$W}  
 pMenu->SetDefaultItem(ID_EXITICON); x"R F[ d  
 CPoint pt; 6|f8DX%3V  
 GetCursorPos(&pt); ocK4Nxs  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ]S@T|08b  
 if(id==ID_EXITICON) -=8f*K[W  
  DeleteIcon(); \ctzv``/n  
 else if(id==ID_EXIT) $!9/s S?  
  OnCancel(); Z]TQ+9t  
 return FALSE; Y%eW6Y#  
} ':_gYA  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); X o9vE3  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) j?]+~  
 AddIcon(); $V?sD{=W  
 return res; =A'JIssk  
} ^%Cd@!dk  
P, l (4  
void CCaptureDlg::AddIcon() Vh?vD:|  
{ XP}5i!}}7=  
 NOTIFYICONDATA data; 2 YWO'PL  
 data.cbSize=sizeof(NOTIFYICONDATA); u1u;aG  
 CString tip; q5EkAh<PD|  
 tip.LoadString(IDS_ICONTIP); SnXM`v,  
 data.hIcon=GetIcon(0); >.od(Fh{l|  
 data.hWnd=GetSafeHwnd(); 4xalm  
 strcpy(data.szTip,tip); 8,RqhT)2#  
 data.uCallbackMessage=IDM_SHELL; Ax~ i`  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 0]'  2i  
 data.uID=98; -UzWLVB^  
 Shell_NotifyIcon(NIM_ADD,&data); zZRLFfz<9  
 ShowWindow(SW_HIDE); t B`"gC~  
 bTray=TRUE;  f-[.^/  
} <b _K*]Z  
sg}<()  
void CCaptureDlg::DeleteIcon() ,%xat`d3,3  
{ 4f8XO"k7t=  
 NOTIFYICONDATA data; @g;DA)!(  
 data.cbSize=sizeof(NOTIFYICONDATA); %++: K  
 data.hWnd=GetSafeHwnd(); }93FWo.  
 data.uID=98; eX"Ecl{  
 Shell_NotifyIcon(NIM_DELETE,&data); Rc4=zimr+  
 ShowWindow(SW_SHOW); pxedj  
 SetForegroundWindow(); =+T0[|gc(r  
 ShowWindow(SW_SHOWNORMAL); ,98 F  
 bTray=FALSE; VZ`YbY  
} [qkW/qS  
D aHbOs_<  
void CCaptureDlg::OnChange() LCA+y1LP-_  
{ [kr-gV  
 RegisterHotkey(); @zi0:3`#0\  
} pG)dF@  
l,b,U/3R.  
BOOL CCaptureDlg::RegisterHotkey() ,H/O"%OJ  
{ gYGoJH1  
 UpdateData(); z4(\yx  
 UCHAR mask=0; Yqo@ g2g  
 UCHAR key=0; r<srTHGL o  
 if(m_bControl) ^*$!9~  
  mask|=4; *,O3@,+>H  
 if(m_bAlt) 9 lG a*f)  
  mask|=2; E2cZk6~m{  
 if(m_bShift) ZK'WKC  
  mask|=1; 4s_5>r4  
  key=Key_Table[m_Key.GetCurSel()]; ]K>bSK^TX  
 if(bRegistered){ z%+rI  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); >>C S8  
  bRegistered=FALSE; zlQBBm;fE  
 } "o u{bKe  
 cMask=mask; Lp|n)29+du  
 cKey=key; y,n.(?!*  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); xpuTh"ED  
 return bRegistered; eA?|X|  
} ..'"kX:5  
eA Fp<2g  
  四、小结 T<Zi67QC@  
N z=P1&G'  
  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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