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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: @-ma_0cZQ  
  Q:x:k+O-  
  一、实现方法 ~BVK6  
&z\]A,=T c  
  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: ;|hEXd?b  
B !(t<W8cu  
#pragma data_seg("shareddata") ffQ%GV_  
HHOOK hHook =NULL; //钩子句柄 BU="BB/[  
UINT nHookCount =0; //挂接的程序数目  yq ?_#r  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 _0rHxh7}q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 $VrKoL\ScA  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey P9p{j1*;  
static int KeyCount =0; g1uqsqYt  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 A!kNqJ2  
#pragma data_seg() a#0G mK  
/Jc?;@{  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 |m%M$^sZ}  
&E{5k{Y  
  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: 6rnehv!p  
y%H;o?<WX  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR |-zwl8E  
cKey,UCHAR cMask) sX&M+'h  
{ S%ri/}qI[{  
 BOOL bAdded=FALSE; :`Kr|3bQ  
 for(int index=0;index<MAX_KEY;index++){ @HfWAFT  
  if(hCallWnd[index]==0){ RT45@   
   hCallWnd[index]=hWnd; O8+[ )+6^  
   HotKey[index]=cKey; 4JHQ^i-aY  
   HotKeyMask[index]=cMask; Or9@X=C  
   bAdded=TRUE; i;0`d0^  
   KeyCount++; ,<lxq<1I  
   break; OU(z};Is6Z  
  } ?CS jn  
 } kC R)k=*  
 return bAdded; FGOa! G  
} ]kmOX  
//删除热键 gkpNT)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) wYf=(w \c  
{ ] %*970  
 BOOL bRemoved=FALSE; H&L=WF+x  
 for(int index=0;index<MAX_KEY;index++){ UZdE ^Q[  
  if(hCallWnd[index]==hWnd){ 9xg_M=72  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2`* %NJ  
    hCallWnd[index]=NULL; TKc&yAK  
    HotKey[index]=0; ED/-,>[f  
    HotKeyMask[index]=0; tji,by#E/%  
    bRemoved=TRUE; !dLz ?0  
    KeyCount--; mm=Y(G[_%y  
    break; ucj)t7O   
   } JXeqVKF  
  } YF{K9M!  
 } e76@-fg  
 return bRemoved; ![5<\  
} UBRMV s  
e>t9\vN#bx  
K74oRKv  
  DLL中的钩子函数如下: |?Q(4(D`*  
1#qCD["8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) w c%  
{ 6\,^MI  
 BOOL bProcessed=FALSE; s/[i>`g/9  
 if(HC_ACTION==nCode) i,")U)b  
 { bT-G<h*M  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Wsz='@XvB  
   switch(wParam) pOI+  
   {   ioi  
    case VK_MENU: ):78GVp  
     MaskBits&=~ALTBIT; -e(2?Xq9  
     break; i`] M2Q   
    case VK_CONTROL: :e@JESlLf  
     MaskBits&=~CTRLBIT; ,P"R.A  
     break; ! T,7  
    case VK_SHIFT: #>'1oC{  
     MaskBits&=~SHIFTBIT; <vt^=QA'  
     break; 0K3FH&.%  
    default: //judge the key and send message QrA8 KSLC  
     break; 3/rvSR!  
   } |>3a9]  
   for(int index=0;index<MAX_KEY;index++){ 9jPb-I-   
    if(hCallWnd[index]==NULL) c0G/irK  
     continue; jZ D\u%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `4EOy:a  
    { NuO>zAu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $Qy(ed  
     bProcessed=TRUE; 2FVKgyV  
    } #6H<JB  
   } ?ha}&##  
  } VvF&E>f C  
  else if((lParam&0xc000ffff)==1){ //有键按下 [d&Faa[`  
   switch(wParam) 5 N/ ]/  
   { 3N*Shzusbt  
    case VK_MENU: Lv^j l  
     MaskBits|=ALTBIT; Zj7XmkL  
     break; 4P~<_]yf  
    case VK_CONTROL: GC\/B0!  
     MaskBits|=CTRLBIT; W"-nzdAJ5  
     break; f<;9q?0VF  
    case VK_SHIFT: '9/kDkt!  
     MaskBits|=SHIFTBIT; P~qVr#eU  
     break; |wb7`6g  
    default: //judge the key and send message <C>i~ <`d  
     break; g^C6"rsnl  
   } |"-,C}O  
   for(int index=0;index<MAX_KEY;index++){ a,4g`?  
    if(hCallWnd[index]==NULL) aBI]' D;  
     continue; ; p_X7N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _[ phs06A  
    { L,D>E  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^`!Daqk  
     bProcessed=TRUE; "QF083$  
    } 4AM*KI  
   } #CS>A# Lk  
  } Ww(_EW  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 (>K$gAQH  
   for(int index=0;index<MAX_KEY;index++){ fA8+SaXW%  
    if(hCallWnd[index]==NULL) Xp~]kRm9  
     continue; 9vbh5xX   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7xc<vl#:q7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Xdq, =;  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 >" .qFn g  
   } m%V[&"5%e  
  } :z\f.+MI  
 } bevT`D  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }m H>lN  
} \$C 4H  
SHk[X ]Uo  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: +Y~+o-_  
cMl%)j-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ??m7xH5u1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4PWr;&  
-"zu"H~t4  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 8[C6LG  
6b/b} vl  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ':V_V. :  
{ ]1&9~TL  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ~{+{pcO}  
 { I5L7BTe  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 #I?iR 3u  
  SaveBmp(); n{t',r50  
  return FALSE; >>$|,Q-.  
 } [tzSr=,Cg  
 …… //其它处理及默认处理 %)9]dOdOk  
} T,uIA]  
x 5SQ+7  
V</T$V$  
  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。 >u)ZT  
JC"K{ V{  
  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。 )!d1<p3  
s.sy7%{  
  二、编程步骤 qYiAwK$  
X^Y9T`mQ}  
  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"; A7C+&I!L  
A E&n^vdQW  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; GX)QIe~;qJ  
g8+,wSE  
  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; zb/Xfu.)?6  
@WHd(ka!  
  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; 5S]P#8  
`5-#M/J  
  5、 添加代码,编译运行程序。 : xZC7"  
aELT"b,x  
三、程序代码 h!K2F~i{P  
['emP1g~  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL %h"< IA S.  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ({KAh?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_  _)E8XyzF  
#if _MSC_VER > 1000 qm=F6*@}  
#pragma once 0xUj#)  
#endif // _MSC_VER > 1000 @izi2ND  
#ifndef __AFXWIN_H__ Q) BoWd  
#error include 'stdafx.h' before including this file for PCH 4p8jV*:@{  
#endif f*vk1dS:*3  
#include "resource.h" // main symbols mzB#O;3=  
class CHookApp : public CWinApp p qN[G=0  
{ k6L373e#Q  
 public: )[sO5X7'^  
  CHookApp(); {H; |G0tR  
  // Overrides t!SQLgA  
  // ClassWizard generated virtual function overrides pMp9 O/u%  
  //{{AFX_VIRTUAL(CHookApp) +~Lzsh"  
 public: 3c^=<i %  
  virtual BOOL InitInstance(); j{R|]SjW2H  
  virtual int ExitInstance(); |/^aL j^u  
  //}}AFX_VIRTUAL 1vs>2` DLa  
  //{{AFX_MSG(CHookApp) W lQ=CRY  
  // NOTE - the ClassWizard will add and remove member functions here. Kw0V4UF  
  // DO NOT EDIT what you see in these blocks of generated code ! 0~b6wuFl  
  //}}AFX_MSG !7`=rT&  
  DECLARE_MESSAGE_MAP() j' KobyX<  
}; hS{ *l9v7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); rg^\BUa-W,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4VJzs$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); = )l:^+q  
BOOL InitHotkey(); "!Oh#Vf  
BOOL UnInit(); oHXW])[  
#endif UUf1T@-  
aE+$&_>ef  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. D 2:a  
#include "stdafx.h" *7;*@H*jd  
#include "hook.h" J5p!-N`NS  
#include <windowsx.h> ,35: Srf|  
#ifdef _DEBUG mUyv+n,  
#define new DEBUG_NEW sq(Ar(L<  
#undef THIS_FILE E'S;4B5?  
static char THIS_FILE[] = __FILE__; dU>R<jl!$  
#endif d)1sP0Z_@  
#define MAX_KEY 100 06 Esc^D  
#define CTRLBIT 0x04 &tz%WW%D8  
#define ALTBIT 0x02 gVA}?t;  
#define SHIFTBIT 0x01 tD7C7m  
#pragma data_seg("shareddata") ws2 j:B  
HHOOK hHook =NULL; ENXW#{N.v  
UINT nHookCount =0; s.`%ZDl@Y  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 5'c+313 lm  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT @VC9gd O/  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Qv0>Pf  
static int KeyCount =0; % r   
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 7R<u=U  
#pragma data_seg() .cT$h?+jyl  
HINSTANCE hins; *CY6 a  
void VerifyWindow(); sJI -  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) '"]>`=R  
//{{AFX_MSG_MAP(CHookApp) 0?Tk* X  
// NOTE - the ClassWizard will add and remove mapping macros here. W[X!P)=w]  
// DO NOT EDIT what you see in these blocks of generated code! 5?{ >9j5  
//}}AFX_MSG_MAP _l!U[{l*d  
END_MESSAGE_MAP() *o e0=  
w4fJ`,  
CHookApp::CHookApp() oj(A`[  
{ D*T$ v   
 // TODO: add construction code here, v(@+6#&  
 // Place all significant initialization in InitInstance S5E,f?l  
} OZB}aow  
&>zy_)  
CHookApp theApp; ?fa,[r|G  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) U~#^ ^  
{ >RL6Jbo|  
 BOOL bProcessed=FALSE; FQ|LA[~  
 if(HC_ACTION==nCode) Hu9-<upc&  
 {  sx(l  
  if((lParam&0xc0000000)==0xc0000000){// Key up z^!A/a[[!  
   switch(wParam) j&[3Be'pQ  
   { J'&B:PZObB  
    case VK_MENU: !/Bw,y ri<  
     MaskBits&=~ALTBIT; Av v  
     break; =Mu'+,dT  
    case VK_CONTROL: *Nf4bH%MN  
     MaskBits&=~CTRLBIT; 4&]To@>  
     break; z)W#&JFF  
    case VK_SHIFT: -4y)qGb*?  
     MaskBits&=~SHIFTBIT; o.A} ``  
     break; lQ<#jxp  
    default: //judge the key and send message tU)r[2H2  
     break; }OP%p/eY  
   } WrHgF*[  
   for(int index=0;index<MAX_KEY;index++){ [Z5}2gB&  
    if(hCallWnd[index]==NULL) \p3nd!OIG  
     continue; PD}SPOA`U3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cGpN4|*rQ  
    { q0b`HD  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !|Xl 8lV`  
     bProcessed=TRUE; :L [YmZ  
    } )kL` &+#>  
   } Bgk~R.l  
  } 9-a2L JI  
  else if((lParam&0xc000ffff)==1){ //Key down im4e!gRE  
   switch(wParam) gB{]yA"('  
   { ^Z-. [Y  
    case VK_MENU: $ gr6  
     MaskBits|=ALTBIT; B'KXQa-$O  
     break; 9o_ g_q  
    case VK_CONTROL: D,GPn%Wqi  
     MaskBits|=CTRLBIT; <r7qq$  
     break; e"o6C\c  
    case VK_SHIFT: L.T gJv43  
     MaskBits|=SHIFTBIT; ?HEtrX,q  
     break; p;n3`aVh  
    default: //judge the key and send message XC7Ty'#"KX  
     break; l?@MUsg+  
   } +9 16ZPk  
   for(int index=0;index<MAX_KEY;index++) qUEd E`B  
   { "u Of~e"  
    if(hCallWnd[index]==NULL) JI+KS  
     continue; eHR&N.2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <i:*p1#Bm  
    { hyk|+z`B  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); B{OW}D$P#  
     bProcessed=TRUE; V`R)#G>IH%  
    } e}](6"t`5  
   } RFZU}.*K$  
  } Pghva*&  
  if(!bProcessed){ AT%* ~tr  
   for(int index=0;index<MAX_KEY;index++){ 9*-pden l  
    if(hCallWnd[index]==NULL) M\\e e3Ih  
     continue; + 4V1>e+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =qV4Sje|q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Wk\mgGn+  
   } 7,W]zKH  
  } ;<bj{#mMv  
 } E'&OOEMN-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &AQg'|  
} qEK4I}Q-=  
/`4v"f0V  
BOOL InitHotkey() >YJ8u{Z{o  
{ ]/ZA/:Oa+  
 if(hHook!=NULL){ e9z$+h  
  nHookCount++; G!!-+n<  
  return TRUE; #RR:3ZP ZC  
 } B&4fYpn  
 else e?^ \r)1  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); }J+ ce  
  if(hHook!=NULL) %jbJ6c  
   nHookCount++; *2qh3  
  return (hHook!=NULL); pIID= 8RJ.  
} Wz6]*P`qv  
BOOL UnInit() xecieC  
{ m0x J05Zx  
 if(nHookCount>1){ >G-8FL  
  nHookCount--; PZ  
  return TRUE; )XmCy"xx  
 } pgz:F#>  
 BOOL unhooked = UnhookWindowsHookEx(hHook); klK-,J  
 if(unhooked==TRUE){ #;\L,a|>*  
  nHookCount=0; p|&ZJ@3  
  hHook=NULL; P[Y{LKAbb  
 } Ax5mP8S  
 return unhooked; `DgaO-Dg3  
} (*Gi~?-  
=F'l's^j  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f nLR  
{ ffmG~$Yh_  
 BOOL bAdded=FALSE; 8N=%X-R%  
 for(int index=0;index<MAX_KEY;index++){ H$NP1^5!  
  if(hCallWnd[index]==0){ rmY,v  
   hCallWnd[index]=hWnd; ]Y_{P~ZX  
   HotKey[index]=cKey; \GijNn9ah  
   HotKeyMask[index]=cMask; Pcs^@QP  
   bAdded=TRUE; s"I-YFP%c  
   KeyCount++; R4#;<)  
   break; CTh1+&Pa  
  } ]^iFqQe  
 } c[(yU#@  
 return bAdded; /#-,R,Q  
} o/tVcv  
C-s>1\I  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3+CSQb8  
{ 8yHq7=  
 BOOL bRemoved=FALSE; qiG]nCq  
 for(int index=0;index<MAX_KEY;index++){ %/{IssCR7  
  if(hCallWnd[index]==hWnd){ BKa A=Bl  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -vyIOH,  
    hCallWnd[index]=NULL; #5'c\\?Q  
    HotKey[index]=0; jo 7Hyw!g  
    HotKeyMask[index]=0; aqcFY8b '  
    bRemoved=TRUE; lTa1pp Zw  
    KeyCount--; ljN zYg~-  
    break; *0=fT}&!  
   } R<0Fy=z  
  } R^jlEt\&P  
 } GwgFi@itN  
 return bRemoved; k-{yu8*';  
} 2-B6IPeI  
.yZK.[x4  
void VerifyWindow() l\K%  
{ Cr' ! "F  
 for(int i=0;i<MAX_KEY;i++){ kR<xtHW  
  if(hCallWnd!=NULL){ +:Lk^Ny  
   if(!IsWindow(hCallWnd)){ NzjMk4t  
    hCallWnd=NULL; f Ub1/-}  
    HotKey=0; ,]0S4h67  
    HotKeyMask=0; 17e=GL  
    KeyCount--; Na\3.:]z  
   } >nc4v6s  
  } ^dFh g_GhF  
 } s9uL<$,'  
} E"Zb};}  
}*?yHJ3  
BOOL CHookApp::InitInstance() Lf5%M|o.)  
{ nVz5V%a!\q  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Jb( DJ-&  
 hins=AfxGetInstanceHandle(); f&6w;T=  
 InitHotkey(); 6{5q@9F  
 return CWinApp::InitInstance(); D~cW ]2  
} =YWT|%^uX  
A{4Dzm!  
int CHookApp::ExitInstance() =hJfL}&O3  
{ +2- qlU  
 VerifyWindow(); 6kP7   
 UnInit(); &foD&  
 return CWinApp::ExitInstance(); MinbE13?U  
} IeO-O'^&`  
=Nw2;TkB[  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file r %+Bc Y  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) uQ{=o]sy  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 0('OyH)  
#if _MSC_VER > 1000 aL88E  
#pragma once \s,Iz[0Vfz  
#endif // _MSC_VER > 1000 7@FDBjq  
Kp8fh-4_  
class CCaptureDlg : public CDialog )V=0IZi  
{ V{43HA10b  
 // Construction 6hp{,8|D"m  
 public: I|H,)!Z  
  BOOL bTray; 7 n\mj\  
  BOOL bRegistered; $2Kau 1  
  BOOL RegisterHotkey(); iwvt%7  
  UCHAR cKey; Vre=%bGw  
  UCHAR cMask; dAL0.>|`0  
  void DeleteIcon(); (RExV?:  
  void AddIcon(); Kl2}o|b   
  UINT nCount; #>BX/O*D  
  void SaveBmp(); ' Q\@19  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor :*#rRQ>t  
  // Dialog Data ^)|&|  
  //{{AFX_DATA(CCaptureDlg) +yGY 785b  
  enum { IDD = IDD_CAPTURE_DIALOG }; |Mt&p#y  
  CComboBox m_Key; 3Hs$]nQ_X  
  BOOL m_bControl; xsYE=^uv  
  BOOL m_bAlt; ]Qd{ '}+  
  BOOL m_bShift; hXNH"0VCV  
  CString m_Path; itw{;j   
  CString m_Number; `Uv)Sf{  
  //}}AFX_DATA 4ffU;6~l'  
  // ClassWizard generated virtual function overrides e$HQuA~Q;  
  //{{AFX_VIRTUAL(CCaptureDlg) 'm[6v}  
 public: 3!>/smb !  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 6nc0=~='$  
 protected: AfN&n= d K  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Mxo6fn6-46  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); {H+?z<BF<  
  //}}AFX_VIRTUAL C>4UbU  
  // Implementation 4\\.n  
 protected: ~> PgJ ^G  
  HICON m_hIcon; W+.{4 K  
  // Generated message map functions mGO>""<:  
  //{{AFX_MSG(CCaptureDlg) #K|0lau l  
  virtual BOOL OnInitDialog(); Gbn4 *<N  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); $6# lTYN~  
  afx_msg void OnPaint(); c8<xFvYG  
  afx_msg HCURSOR OnQueryDragIcon(); 9^au$KoU  
  virtual void OnCancel(); ;Xyte  
  afx_msg void OnAbout(); |:N>8%@6c  
  afx_msg void OnBrowse(); e{0L%%2K  
  afx_msg void OnChange(); |0kXCq  
 //}}AFX_MSG I(n }<)eF  
 DECLARE_MESSAGE_MAP() @UO}W_0ZD  
}; &L%Jy #=  
#endif 8aZ$5^z  
XMw.wQ '?  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file =e{.yggE  
#include "stdafx.h" MxTmWsaW  
#include "Capture.h" };r|}v !~_  
#include "CaptureDlg.h" 3{e'YD~hP  
#include <windowsx.h> NF mc>0-  
#pragma comment(lib,"hook.lib") v,jhE9_O0  
#ifdef _DEBUG x,\!DLq:p  
#define new DEBUG_NEW iDw.i"b  
#undef THIS_FILE ,#d[ad<  
static char THIS_FILE[] = __FILE__;  HxIoA  
#endif '_ 0  
#define IDM_SHELL WM_USER+1 @1g&Z}L o  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); kYlg4 .~M  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ! Mo`^ t  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; AF$\WWrB  
class CAboutDlg : public CDialog 'I v_mig  
{ 4,~tl~FD  
 public: 5un^yRMB-  
  CAboutDlg(); CTp!di|  
  // Dialog Data '$[Di'*;  
  //{{AFX_DATA(CAboutDlg) `Mk4sKU\a  
  enum { IDD = IDD_ABOUTBOX }; qfr Ni1\9-  
  //}}AFX_DATA ^A!$i$NON  
  // ClassWizard generated virtual function overrides q@ZlJ3%l,  
  //{{AFX_VIRTUAL(CAboutDlg) |')-VhLLK  
 protected: hcyO97@r  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S-!=NX&C  
  //}}AFX_VIRTUAL 0 iR R{a<  
  // Implementation 6/1$< !WH  
 protected: V`bs&5#Sx  
  //{{AFX_MSG(CAboutDlg) si(cOCj/  
  //}}AFX_MSG ($>XIb9f  
  DECLARE_MESSAGE_MAP() [s}/nu~U  
}; 8r^ ~0nm  
e_rzA  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) S4bBafj[I  
{ %4,?kh``D  
 //{{AFX_DATA_INIT(CAboutDlg) m|F:b}0Hb  
 //}}AFX_DATA_INIT w z=z?AZW  
} P1V1as  
;#/0b{XFj  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) S GM!#K  
{ IzUo0D*@  
 CDialog::DoDataExchange(pDX); &{z<kmc$6  
 //{{AFX_DATA_MAP(CAboutDlg) P^i.La,  
 //}}AFX_DATA_MAP E\$C/}T  
} S_\ F  
&z@~B&O  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) nIBFk?)6  
 //{{AFX_MSG_MAP(CAboutDlg) >qh?L#Fk  
 // No message handlers Cv^`&\[SW+  
 //}}AFX_MSG_MAP 6ep>hS4A&  
END_MESSAGE_MAP() Fm3t'^SqF  
!9 f4R/ ?  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) c-8!#~M(  
: CDialog(CCaptureDlg::IDD, pParent) z<&m*0WYA  
{ Lh ap4:  
 //{{AFX_DATA_INIT(CCaptureDlg) .:9s}%Z r  
  m_bControl = FALSE; CDdkoajBa  
  m_bAlt = FALSE; -^SA8y  
  m_bShift = FALSE; |/T43ADW  
  m_Path = _T("c:\\"); ?KP}#>Ba@  
  m_Number = _T("0 picture captured."); >|*yh~  
  nCount=0; 'jjb[{g^}}  
  bRegistered=FALSE;  CdZ BG  
  bTray=FALSE; v\%G|8+]  
 //}}AFX_DATA_INIT 33a uho  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 L`[z[p {?  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 79BaDB`{a  
} b$- e\XB!  
9 26Tl  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }V`mp  
{ lZWX7FO'  
 CDialog::DoDataExchange(pDX); OYmi?y\  
 //{{AFX_DATA_MAP(CCaptureDlg) , Z ~;U  
  DDX_Control(pDX, IDC_KEY, m_Key); hfrnxeM#~  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); C@gXT]Q 0}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); q p~g P  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); >/^#Drwb!i  
  DDX_Text(pDX, IDC_PATH, m_Path); UtJa3ya  
  DDX_Text(pDX, IDC_NUMBER, m_Number); qf8[!5GM  
 //}}AFX_DATA_MAP S$[k Q|Am  
} 0rE(p2  
rU2iy"L  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) kWW w<cA  
//{{AFX_MSG_MAP(CCaptureDlg) F L=,YP  
 ON_WM_SYSCOMMAND() 6`\ya@  
 ON_WM_PAINT() ]R IVc3?;$  
 ON_WM_QUERYDRAGICON() xf,5R9g/  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) -]S.<8<$  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1*Ar{:+ua  
 ON_BN_CLICKED(ID_CHANGE, OnChange) `G$1n#&  
//}}AFX_MSG_MAP BfmsMW  
END_MESSAGE_MAP() ig_2={Q@  
:i*JnlvZ  
BOOL CCaptureDlg::OnInitDialog() )=^w3y  
{ `<fh+*  
 CDialog::OnInitDialog(); 9|W V~  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ga0'zo9K  
 ASSERT(IDM_ABOUTBOX < 0xF000); Ph,- sR  
 CMenu* pSysMenu = GetSystemMenu(FALSE); cQUC.TZ_  
 if (pSysMenu != NULL) ,k0r  
 { x\@*6 0o  
  CString strAboutMenu; z@VP:au  
  strAboutMenu.LoadString(IDS_ABOUTBOX); L,]=vba'$  
  if (!strAboutMenu.IsEmpty()) Tg ?x3?kw  
  { vqNsZ 8|`  
   pSysMenu->AppendMenu(MF_SEPARATOR); 5#2 F1NX  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); jC, FG'P  
  } G|u3UhyB  
 } 0l\y.   
 SetIcon(m_hIcon, TRUE); // Set big icon !<n"6KA.  
 SetIcon(m_hIcon, FALSE); // Set small icon |m G7XL,  
 m_Key.SetCurSel(0); 0ejdKdYN  
 RegisterHotkey(); buMq F-j  
 CMenu* pMenu=GetSystemMenu(FALSE); Q^_/By@  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); C"w {\ &R  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Ru\_dr2yI}  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 1np^(['ih  
 return TRUE; // return TRUE unless you set the focus to a control U 4,2br>  
} TMVryb  
= +Xc4a  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) KEr\nKT1  
{ Ufid%T'  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) { T]?o~W  
 { =zg:aTMti  
  CAboutDlg dlgAbout; X%{'<baR  
  dlgAbout.DoModal(); [_6&N.  
 } 'mMjjG9  
 else 8E^@yZo{  
 { f [o%hCS  
  CDialog::OnSysCommand(nID, lParam); x"4%(xBu  
 } GdmmrfXB  
} 8cxai8  
NAFsFngqH  
void CCaptureDlg::OnPaint() 3OqX/z,  
{ @gfDp<  
 if (IsIconic()) RW7(r/C  
 { 7C,T&g 1:  
  CPaintDC dc(this); // device context for painting @y|_d  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); -X1X)0v$  
  // Center icon in client rectangle n!ok?=(kQ  
  int cxIcon = GetSystemMetrics(SM_CXICON); SZ!=`a]  
  int cyIcon = GetSystemMetrics(SM_CYICON); [`_io>*g  
  CRect rect; :+&AY2`  
  GetClientRect(&rect); @R2at  
  int x = (rect.Width() - cxIcon + 1) / 2; 4Yjx{5QSAG  
  int y = (rect.Height() - cyIcon + 1) / 2; y2yKm1<Ru<  
  // Draw the icon "^CXY3v  
  dc.DrawIcon(x, y, m_hIcon); F} DUEDND*  
 } eiMH['X5  
 else 6[dur'x  
 { ,^s  
  CDialog::OnPaint(); )R)a@op  
 } 40P) 4w  
} j|(Z#3J  
c6AWn>H  
HCURSOR CCaptureDlg::OnQueryDragIcon() ]$iN#d|ZU  
{ Tupiq  
 return (HCURSOR) m_hIcon; (Xx n\*S  
} n&XGBwgW  
Qvoqx>2p5  
void CCaptureDlg::OnCancel() g"8 .}1)~r  
{ 0~gO'*2P  
 if(bTray) oduDA:  
  DeleteIcon(); +|RB0}hFS-  
  CDialog::OnCancel(); \NL+}cL/  
} b=PVIZ  
3sm M,fi  
void CCaptureDlg::OnAbout() ": ;@Hnb/  
{ i6PM<X,{;  
 CAboutDlg dlg; gUax'^w;V;  
 dlg.DoModal(); U8QX46Br  
} CnF |LTi  
Q5+_u/  
void CCaptureDlg::OnBrowse() <,%:   
{ `iG,H[t+j  
 CString str; VM=+afY5M  
 BROWSEINFO bi; oR#:Nt X@  
 char name[MAX_PATH]; K`KLC.j  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); _7)F ?  
 bi.hwndOwner=GetSafeHwnd(); %b!-~ Y.  
 bi.pszDisplayName=name; 2z0n<`  
 bi.lpszTitle="Select folder"; udqS'g&  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; %Kb9tHg  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); L\aBc}  
 if(idl==NULL) v:_B kHN'  
  return; d+L#t  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Cpl;vQ  
 str.ReleaseBuffer(); Ka_S n  
 m_Path=str; ] Uc`J8p,  
 if(str.GetAt(str.GetLength()-1)!='\\') S01wwZ  
  m_Path+="\\"; N=1JhjVk"  
 UpdateData(FALSE); tykB.2f  
} FH5ql~  
.m4;^S2cO  
void CCaptureDlg::SaveBmp() [w \?j,  
{ f|7u_f  
 CDC dc; `iShJz96  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); JC;^--0(z  
 CBitmap bm; u' Qd,  
 int Width=GetSystemMetrics(SM_CXSCREEN); U yqXMbw@  
 int Height=GetSystemMetrics(SM_CYSCREEN); B5am1y{P#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); .V'V:;BE%  
 CDC tdc; A7XnHPIw  
 tdc.CreateCompatibleDC(&dc); QDmYSY$  
 CBitmap*pOld=tdc.SelectObject(&bm); #=e;?w  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); JqUADm  
 tdc.SelectObject(pOld); f^Bc  
 BITMAP btm; alFjc.~}  
 bm.GetBitmap(&btm); c@m5 ~  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; u b?K,  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); hq>Csj==@  
 BITMAPINFOHEADER bih; g=)J~1&p  
 bih.biBitCount=btm.bmBitsPixel; <g2_6C\j  
 bih.biClrImportant=0; i, nD5 @#  
 bih.biClrUsed=0; ]rBM5~  
 bih.biCompression=0; VDEv>u4  
 bih.biHeight=btm.bmHeight; } /^C|iS7  
 bih.biPlanes=1; ^(x^6d  
 bih.biSize=sizeof(BITMAPINFOHEADER); <I*x0BM=  
 bih.biSizeImage=size; Q}AE.Ef@<  
 bih.biWidth=btm.bmWidth; x2VBm$>  
 bih.biXPelsPerMeter=0; WgGm#I>K  
 bih.biYPelsPerMeter=0; 7Hw<ojkt  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); }odV_WT  
 static int filecount=0; ,t$,idcT+  
 CString name; kUHE\L.Y]  
 name.Format("pict%04d.bmp",filecount++); /FY2vDfU6  
 name=m_Path+name; KU&G;ni2  
 BITMAPFILEHEADER bfh; _Tm0x>EM  
 bfh.bfReserved1=bfh.bfReserved2=0; N]/!mo?  
 bfh.bfType=((WORD)('M'<< 8)|'B'); cd@.zg'sYn  
 bfh.bfSize=54+size; 8%{q%+  
 bfh.bfOffBits=54; !UBO_X%dz  
 CFile bf; V1=*z  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =H]F`[B=  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); "kW!{n  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); wzcai 0y*  
  bf.WriteHuge(lpData,size); USML~]G z  
  bf.Close(); v[k5.\No  
  nCount++; \&xl{64  
 } J QKdW  
 GlobalFreePtr(lpData); V2&^!#=s  
 if(nCount==1) !|wzf+V  
  m_Number.Format("%d picture captured.",nCount); eOl KbJU  
 else |?m` xO  
  m_Number.Format("%d pictures captured.",nCount); tV;% J4E'  
  UpdateData(FALSE); HaNboYW_K  
} /)|X.D  
v@ C,RP9  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 7()?C}Ni-  
{ h+UnZfm  
 if(pMsg -> message == WM_KEYDOWN) ,8Iv9M}2  
 { m 40m<@  
  if(pMsg -> wParam == VK_ESCAPE) 6)RbPPeE  
   return TRUE; >O9 sk  
  if(pMsg -> wParam == VK_RETURN) &rq{v!=7  
   return TRUE; i\}:hU-U  
 } iAO5"(>}?  
 return CDialog::PreTranslateMessage(pMsg); |lQ;ALH!  
} {kB `>VS  
G&{HTYP  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |  FM }  
{ %B2XznZ:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ P!g-X%ngo  
  SaveBmp(); nn~YK  
  return FALSE; B;zt#H4  
} - Xupq/[,  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Rhgj&4  
 CMenu pop; h,t|V}Wb  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); .=R lOK  
 CMenu*pMenu=pop.GetSubMenu(0); !F4;_A`X  
 pMenu->SetDefaultItem(ID_EXITICON); JMV50 y  
 CPoint pt; 3 pWM~(#>-  
 GetCursorPos(&pt); GRYe<K  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); $K}. +`vVO  
 if(id==ID_EXITICON) ('k<XOi  
  DeleteIcon(); @M;(K<%h  
 else if(id==ID_EXIT) [uuj?Rbd  
  OnCancel(); s'I)A^i+  
 return FALSE; V-W'RunnW  
} =jAFgwP\  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); lP<I|O=z  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Se^^E.Z,W  
 AddIcon(); >wON\N0V_  
 return res; bi[7!VQf  
} W.}].7}h  
9 t:]  
void CCaptureDlg::AddIcon() BR_TykP  
{ 3!9 Z=- tD  
 NOTIFYICONDATA data; ^JeMuU  
 data.cbSize=sizeof(NOTIFYICONDATA); h BMH)aU  
 CString tip; eQN.sl5  
 tip.LoadString(IDS_ICONTIP); JNU/`JN9f  
 data.hIcon=GetIcon(0); I2Ev~!  
 data.hWnd=GetSafeHwnd(); TRvZ  
 strcpy(data.szTip,tip); cgZaPw2 bw  
 data.uCallbackMessage=IDM_SHELL; D@54QJ<  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; kEN#u  
 data.uID=98; %CH6lY=lI  
 Shell_NotifyIcon(NIM_ADD,&data); ]?l{j  
 ShowWindow(SW_HIDE); O12Q8Oj!0  
 bTray=TRUE; @"87F{!  
} *YV S|6bs  
fv'4f$U  
void CCaptureDlg::DeleteIcon() 85Y|CN] vQ  
{ X)Gp7k1w  
 NOTIFYICONDATA data; Ww9;UP'G  
 data.cbSize=sizeof(NOTIFYICONDATA); j BS4vvX?  
 data.hWnd=GetSafeHwnd(); .(Y6$[#@  
 data.uID=98; XX;6 P  
 Shell_NotifyIcon(NIM_DELETE,&data); ZW4aY}~)$  
 ShowWindow(SW_SHOW); mf$j03tu  
 SetForegroundWindow(); YcM;S  
 ShowWindow(SW_SHOWNORMAL); +&v\ /  
 bTray=FALSE; 0{rx.C7|  
} hSV@TL  
W Ox_y,  
void CCaptureDlg::OnChange()  @|A|  
{ khX|" d360  
 RegisterHotkey(); #a~"K|' G  
} HCnf2td  
e<+<lj "  
BOOL CCaptureDlg::RegisterHotkey() !c(QSf502  
{ d,#.E@Po  
 UpdateData(); GrI&?=S^  
 UCHAR mask=0; ocA]M=3~k  
 UCHAR key=0; yXfMzG  
 if(m_bControl) P'[<A Z  
  mask|=4; m#@_8_ M  
 if(m_bAlt) hl/itSl$  
  mask|=2; .Ao0;:;(2-  
 if(m_bShift) K b(9)Re  
  mask|=1; ';YgG<u  
  key=Key_Table[m_Key.GetCurSel()]; D'i6",Z>  
 if(bRegistered){ XAic9SNu;  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); R{}qK r  
  bRegistered=FALSE; :=.*I  
 } !k&)EWP?  
 cMask=mask; ~l4f{uOD>]  
 cKey=key; F8mC?fbK9  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); mUXk9X%n  
 return bRegistered; sg?@qc=g  
} ZXXiL#^  
#uvJH8)D  
  四、小结 "dCzWFet  
L]bVN)JU  
  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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