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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: FUI/ A >  
  ruhC:rg:/  
  一、实现方法 qPu?rU{2  
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  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: .9DhD=8aIO  
89[/UxM)  
#pragma data_seg("shareddata") 8f,",NCgc  
HHOOK hHook =NULL; //钩子句柄 yJx,4be  
UINT nHookCount =0; //挂接的程序数目 k8Dk;N  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 QKk7"2t|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ,9OER!$y  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey w_@6!zm  
static int KeyCount =0; :4:U\k;QwA  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 6hcs )X7m  
#pragma data_seg() *"|f!t  
Z'AjeZyyE  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 "<oR.f=0  
wKW.sZ!S1  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: P EzT|uY  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR B_!S\?}$  
cKey,UCHAR cMask) Xk^<}Ep)c  
{ y=GDuU%  
 BOOL bAdded=FALSE; BAqwYWdS  
 for(int index=0;index<MAX_KEY;index++){ R]Fa?uQW  
  if(hCallWnd[index]==0){ 0Dd8c \J  
   hCallWnd[index]=hWnd; s$^ 2Cuhv  
   HotKey[index]=cKey; GWx?RIKF  
   HotKeyMask[index]=cMask; <{V{2V#  
   bAdded=TRUE; _)CCD33$  
   KeyCount++; 45+kwo0  
   break; p3%cb?G%w  
  } V(G{_>>  
 } [CnoMN  
 return bAdded; &Ai +t2  
} 6_EfOD9  
//删除热键 jJ>I*'w  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %AMF6l[  
{ _=w=!U&W  
 BOOL bRemoved=FALSE; d.snD)X  
 for(int index=0;index<MAX_KEY;index++){ a/d8_(0  
  if(hCallWnd[index]==hWnd){ nQw, /L k  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (!ud"A|ab4  
    hCallWnd[index]=NULL; &WbHM)_n  
    HotKey[index]=0; B(@uJ^N  
    HotKeyMask[index]=0; q!d7Ms{q  
    bRemoved=TRUE; ]VVx2ERs  
    KeyCount--; iA2TvP#  
    break; 17rg!'+   
   } 5Shc$Awc!  
  } (i)O@Jve  
 } 5N>L|J2  
 return bRemoved; 5t-(MY  
} c*8k _o,  
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  DLL中的钩子函数如下: G!GGT?J  
B3u:D"t  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~\R+p~>  
{ cMUmJH  
 BOOL bProcessed=FALSE; P; =,Q$e8  
 if(HC_ACTION==nCode) V=GP_^F  
 { )=h+5Z>E1  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 g*U[?I"sC  
   switch(wParam) 7*&q"   
   {  _t7aOH  
    case VK_MENU: -A8CW9|mk  
     MaskBits&=~ALTBIT; ECOzquvM  
     break; 4!+IsT  
    case VK_CONTROL: v~O2y>8Z  
     MaskBits&=~CTRLBIT; oFJx8XU  
     break; ! "^//2N+,  
    case VK_SHIFT: +_fxV|}P  
     MaskBits&=~SHIFTBIT; kEdAt5/U{  
     break; y#{> tC  
    default: //judge the key and send message LZpqv~av  
     break; u_)'}  
   } 0o!Egq_  
   for(int index=0;index<MAX_KEY;index++){ $T'lWD*  
    if(hCallWnd[index]==NULL) [{-;cpM \  
     continue; ue6&)7:~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *Q3q(rdrp  
    { ^paM{'J\\)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); pu+jw<7  
     bProcessed=TRUE; vB/G#\Zqz  
    } 9<!Ie^o?  
   } XCZNvLG  
  } _$qH\>se  
  else if((lParam&0xc000ffff)==1){ //有键按下 LT '2446  
   switch(wParam) ?F%,d{^  
   { #.W<[KZf  
    case VK_MENU: 8<g9 ~L  
     MaskBits|=ALTBIT; G C3G=DTt  
     break; k'{Bhi4  
    case VK_CONTROL: =qTmFszT  
     MaskBits|=CTRLBIT; dxeLu  
     break; >uDE<MUC  
    case VK_SHIFT: Bt-2S,c,o  
     MaskBits|=SHIFTBIT; TzY[- YlvF  
     break; !.5,RIf  
    default: //judge the key and send message 4T:@W C  
     break; e/!xyd  
   } eN ]9=Y~-K  
   for(int index=0;index<MAX_KEY;index++){ w'D=K_h  
    if(hCallWnd[index]==NULL) dX~$#-Ad86  
     continue; p#(5 ;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nJo6;_MI!  
    { 6<C|O-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _QOZ`st  
     bProcessed=TRUE; t2q{;d~.  
    } nx'D&, VX  
   } -]~vE fq+T  
  } f+W %X  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 =ET|h}I  
   for(int index=0;index<MAX_KEY;index++){ PzD ekyl  
    if(hCallWnd[index]==NULL) !@kwHJkv  
     continue; wtnC^d$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Bgj^n{9x  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <MBpV^Y}  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 -eoXaP{[  
   } ).1 F0T  
  } P>i[X0UnL  
 } 3rw<#t;v  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :HQQ8uQfb  
} x.~AvJ  
%Y//}  
  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: 1|Z!8:&pj  
Z |CL:)h  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -mK;f$X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); EG[Rda  
i"o %Gc  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: &ywU^hBh  
=5m~rJ< {  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) uMe]].04  
{ i_6 Y6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) o& "nF+,  
 { aoVfvz2Y  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ?#P@N4Uw}y  
  SaveBmp(); g/6>>p`J  
  return FALSE; =Hwlo!  
 } `z{sDe;  
 …… //其它处理及默认处理 '&hk?  
} 3=~0m  
i@p0Jnh|  
ev;R; 0<  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 wXnluE  
-3On^Wj]  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Q9h;`G 7t  
E2~&GkU.UN  
  二、编程步骤 (W4H?u@X0  
m]#oZVngy  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Q,m1mIf  
9( "<NB0y  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; (TJ )Y7E  
zo~5(O@  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Y(3X5v?[  
 )tW0iFY  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; =9AX\2w*H;  
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  5、 添加代码,编译运行程序。 gkw/Rd1oG  
hY S}PE  
三、程序代码 nkn4VA?"  
.P^&sl*J  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL &nyJ :?  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) AeN$AqQd/  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ \=NS@_t,  
#if _MSC_VER > 1000 *kE<7  
#pragma once 51&K  
#endif // _MSC_VER > 1000 L|H:&|F  
#ifndef __AFXWIN_H__ lqoJ2JMy  
#error include 'stdafx.h' before including this file for PCH -- chU5  
#endif qzt.k^'-^  
#include "resource.h" // main symbols KrDG  
class CHookApp : public CWinApp Mo~zq.  
{ + #V.6i  
 public: r?j2%M\  
  CHookApp(); &<RK=e'*x  
  // Overrides gJC~$/2  
  // ClassWizard generated virtual function overrides -L&%,%  
  //{{AFX_VIRTUAL(CHookApp) m#.N  
 public: iu+r=s p  
  virtual BOOL InitInstance(); r#X6jU  
  virtual int ExitInstance(); MGU%"7i'}  
  //}}AFX_VIRTUAL AkE(I16Uy~  
  //{{AFX_MSG(CHookApp) bs9X4n5  
  // NOTE - the ClassWizard will add and remove member functions here. +9!=pRq  
  // DO NOT EDIT what you see in these blocks of generated code ! Cl>{vS N  
  //}}AFX_MSG j}fu|-  
  DECLARE_MESSAGE_MAP() 9H#;i]t&  
}; ZGZ1Q/WH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); o/~Rf1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -b`O"Ck*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); d,d ohi  
BOOL InitHotkey(); zD,K_HicI  
BOOL UnInit(); 8%Eau wAx  
#endif ]u<8j r  
)~[rb<:)b  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. x>TIQU=\  
#include "stdafx.h" cWS 0B $$  
#include "hook.h" DP5}q"l  
#include <windowsx.h> la}Xo0nq0+  
#ifdef _DEBUG BDiN*.w5  
#define new DEBUG_NEW DO{Lj# @  
#undef THIS_FILE >Xv Fg  
static char THIS_FILE[] = __FILE__; >#Ue`)d`aY  
#endif u]uZc~T  
#define MAX_KEY 100 0 F-db  
#define CTRLBIT 0x04 &6q67  
#define ALTBIT 0x02 o@47WD'm  
#define SHIFTBIT 0x01 J[7Sf^r  
#pragma data_seg("shareddata") # m;|QWW  
HHOOK hHook =NULL; |\3X7)^8D  
UINT nHookCount =0; AREpZ2GiU  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey o<8SiVC2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT %("WoBPH`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey }u?DK,R  
static int KeyCount =0; 6O0CF}B*  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift iwx*mC{|A  
#pragma data_seg() YM.Q?p4g  
HINSTANCE hins; >%1mx\y^  
void VerifyWindow(); Oz-;2   
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) GMW,+  
//{{AFX_MSG_MAP(CHookApp) /|#";QsPN  
// NOTE - the ClassWizard will add and remove mapping macros here. }$X/HK  
// DO NOT EDIT what you see in these blocks of generated code! &X&msEM  
//}}AFX_MSG_MAP  ;U<}2M!g  
END_MESSAGE_MAP() cl1>S3  
TK s l.|  
CHookApp::CHookApp() bJ5 VlK67R  
{ GX0S9s  
 // TODO: add construction code here, u#Y#,:{  
 // Place all significant initialization in InitInstance dk>qTY+j5  
} ` ),ACkU>U  
_oAWj]~rO  
CHookApp theApp; &Fy})/F3v  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) E@[ZwTnJ  
{ h"ZR`?h  
 BOOL bProcessed=FALSE; L)yc_ d5  
 if(HC_ACTION==nCode) !}I+)@~\w  
 { ={[9kR i  
  if((lParam&0xc0000000)==0xc0000000){// Key up Ce`#J6lT  
   switch(wParam) !&#5 *  
   { V<ExR@|}.%  
    case VK_MENU: ;%B:1Z  
     MaskBits&=~ALTBIT; y)uxj-G  
     break; hA:RVeS{  
    case VK_CONTROL: D7|qFx;]g  
     MaskBits&=~CTRLBIT; 2qpUUo f  
     break; =";G&)H-  
    case VK_SHIFT: 2`P=ekF]  
     MaskBits&=~SHIFTBIT; `PS^o#  
     break; Q nmv?YXS  
    default: //judge the key and send message `RHhc{  
     break; C7Ny-rj}IA  
   } /Xf_b.ZM&  
   for(int index=0;index<MAX_KEY;index++){ #fT<]j(  
    if(hCallWnd[index]==NULL) zTS P8Q7  
     continue; /v8yE9N_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) oxZXY]$y  
    { kG>m(n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); W'"p:Uh q  
     bProcessed=TRUE; T0v{qQ  
    } k@}g?X`8  
   } J u"K"  
  } ' o(7@   
  else if((lParam&0xc000ffff)==1){ //Key down Gy6PS{yY6t  
   switch(wParam) sg%Ptp  
   { ;Z!x\{- L  
    case VK_MENU: 'LMMo4o3  
     MaskBits|=ALTBIT; Xv2Q8-}w  
     break; 8fWk C<f}  
    case VK_CONTROL: "Ta"5XW  
     MaskBits|=CTRLBIT; 1w}D fI  
     break; Lhmb= @  
    case VK_SHIFT: @FaK/lKK  
     MaskBits|=SHIFTBIT;  RxO !h8  
     break; #u/5 nm  
    default: //judge the key and send message U0@Qc}y  
     break; (-%1z_@Y  
   } d7P' c!@+  
   for(int index=0;index<MAX_KEY;index++) S+7u,%n/  
   { +j(7.6ia  
    if(hCallWnd[index]==NULL) :CGh$d] +  
     continue; Wxa</n8S[n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 71G\b|5  
    { yn|U<Hxl~H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,;)_$%bHc  
     bProcessed=TRUE; .f-s+J&ED  
    } X?++I 4\  
   } E~ +g6YlT  
  } k]=lo'bF4  
  if(!bProcessed){ 8;$zD]{D1  
   for(int index=0;index<MAX_KEY;index++){ l?O%yf`s  
    if(hCallWnd[index]==NULL) Mn TqWC90  
     continue; !0X/^Xv@=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #b>D^=NV>)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); p-kug]qX  
   } B3Daw/G  
  } (y5 ]]l  
 } @cB6,iUr  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); S7(tGD  
} >)bn #5  
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BOOL InitHotkey() "@UyUL  
{ Dd'J"|jF38  
 if(hHook!=NULL){ ^\g?uH6k U  
  nHookCount++; |*B9{/;4  
  return TRUE; &0RKNpw g  
 } .f9&.H#  
 else j5!pS xOC  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); =y0h\<[  
  if(hHook!=NULL) M.``o1b  
   nHookCount++; $f AZ^   
  return (hHook!=NULL); Bk@&k}0  
} Np@RK1}  
BOOL UnInit() {r?+PQQ#  
{  L0>7v  
 if(nHookCount>1){ WZ N0`Od  
  nHookCount--; <lP5}F87  
  return TRUE; >!PCEw<i  
 } p%-;hL!  
 BOOL unhooked = UnhookWindowsHookEx(hHook); wUKt$_]``  
 if(unhooked==TRUE){ ;8g[y"I  
  nHookCount=0; 2#X>^LH  
  hHook=NULL; D2'J (  
 } U*\ 1d  
 return unhooked; Zp+orc7  
} n!h952"  
d,E2l~s  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #D^( dz*  
{ h@@q:I=  
 BOOL bAdded=FALSE; rO]2we/B,4  
 for(int index=0;index<MAX_KEY;index++){ #&sn l  
  if(hCallWnd[index]==0){ l4AXjq2  
   hCallWnd[index]=hWnd; z_%}F':  
   HotKey[index]=cKey; / mwsF]Y  
   HotKeyMask[index]=cMask; J<MuWgx&  
   bAdded=TRUE; KJW^pAj$B  
   KeyCount++; jdd3[  
   break; $|VD+[jSV  
  } '5\?l:z  
 } eA-$TSWh  
 return bAdded; o,!W,sx_  
} En ]"^*  
j`QXl  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  Sr+ &  
{ %Mf3OtPiJW  
 BOOL bRemoved=FALSE; &W%fsy<  
 for(int index=0;index<MAX_KEY;index++){ y$+_9VzYB  
  if(hCallWnd[index]==hWnd){ q3ebps9^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ wDKA1i%G  
    hCallWnd[index]=NULL;  h 3V; J  
    HotKey[index]=0; >S@><[C  
    HotKeyMask[index]=0; Q&vU|y  
    bRemoved=TRUE; emG1Wyl  
    KeyCount--; o$Z]qhq  
    break; O +Xu ?W]  
   } |`O210B@  
  } EO\- J-nM  
 } & sgzSX  
 return bRemoved; H={5>;8G  
} 0}- MWbG  
RY]jY | E  
void VerifyWindow() q U^`fIa  
{ ' pfkbmJ  
 for(int i=0;i<MAX_KEY;i++){ Q #p gl  
  if(hCallWnd!=NULL){ rQ)I  
   if(!IsWindow(hCallWnd)){ / gP"X1.  
    hCallWnd=NULL; UVD*GsBk  
    HotKey=0; yH(%*-S  
    HotKeyMask=0; e/zz.cd){  
    KeyCount--; 4R& pb1eF  
   } < ;fI*km  
  } +@MG$*}Oz  
 } i([|@Y=  
} sPRs;to-  
QLb!e"C  
BOOL CHookApp::InitInstance() 95*=& d  
{ }*VRj;ff  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); |M|>/U 8  
 hins=AfxGetInstanceHandle(); bf/z T0  
 InitHotkey(); Xbc:Vr  
 return CWinApp::InitInstance(); ;M5]XCP k  
} Oe&gTXo  
K%YR; )5A  
int CHookApp::ExitInstance() C:RA(  
{ \iAs  
 VerifyWindow(); C,,S<=L:  
 UnInit(); B1va]=([)W  
 return CWinApp::ExitInstance(); 07>Iq8<mu  
} H'jo 3d~+  
F+9(*|x%  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^\w!D{Y7Q  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ye`-U?7.  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 4#ZZwa]y  
#if _MSC_VER > 1000 {  P@mAw  
#pragma once 8:k-]+#o  
#endif // _MSC_VER > 1000 V BjA$.  
4B@Ir)^(*  
class CCaptureDlg : public CDialog >uwd3XW5  
{ 4)d"}j  
 // Construction 3u4P [   
 public: bE b+oRI  
  BOOL bTray; IhXP~C6  
  BOOL bRegistered; )odz/\9n3c  
  BOOL RegisterHotkey(); |\N))K-2D  
  UCHAR cKey; ;& zBNj  
  UCHAR cMask; ?;DzWCL~9  
  void DeleteIcon(); hzrS_v  
  void AddIcon(); l:j>d^V*&x  
  UINT nCount; B1 xlWdm  
  void SaveBmp(); ?'^yw C`  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor U\6Ee-1#_  
  // Dialog Data )pw53,7>aN  
  //{{AFX_DATA(CCaptureDlg) uwu`ms7z 2  
  enum { IDD = IDD_CAPTURE_DIALOG }; `}#n#C)  
  CComboBox m_Key; }h=3[pe}  
  BOOL m_bControl; h 2C9p2.  
  BOOL m_bAlt; >Slu?{l'  
  BOOL m_bShift; m,r>E%;Cj  
  CString m_Path; S~V?Qe@&Z  
  CString m_Number; RIq\IQ_|  
  //}}AFX_DATA g4GU28l  
  // ClassWizard generated virtual function overrides N.-*ig.YR7  
  //{{AFX_VIRTUAL(CCaptureDlg) Zi.w+V  
 public: c@{M),C~E  
  virtual BOOL PreTranslateMessage(MSG* pMsg); IaGF{O3.  
 protected: 59k-,lyU,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support TJs~}&L  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); {#&jW  
  //}}AFX_VIRTUAL gk4DoOj#P  
  // Implementation .}3K9.hkr  
 protected: }PzHtA,V  
  HICON m_hIcon; 'Xg9MS&  
  // Generated message map functions ,<fs+oi  
  //{{AFX_MSG(CCaptureDlg) #<yKG\X?  
  virtual BOOL OnInitDialog(); jNW/Biy4u  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); TlJ'pG 4^  
  afx_msg void OnPaint(); +kT o$_Wkz  
  afx_msg HCURSOR OnQueryDragIcon(); 7QHrb'c  
  virtual void OnCancel(); o.])5i_HV  
  afx_msg void OnAbout(); 2Y%E.){  
  afx_msg void OnBrowse(); J pKCux  
  afx_msg void OnChange(); 3.@ir"vy  
 //}}AFX_MSG j\2q2_f  
 DECLARE_MESSAGE_MAP() 9Nu:{_YoP  
}; >RXDuCVi  
#endif ^Kn:T`vB  
9tIE+RD  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file j_}f6d/h  
#include "stdafx.h" 7?2<W-n  
#include "Capture.h" d2*uY.,  
#include "CaptureDlg.h" >C/O >g  
#include <windowsx.h> K(Ak+&[  
#pragma comment(lib,"hook.lib") W" 1=K] B  
#ifdef _DEBUG !6eF8T  
#define new DEBUG_NEW KHoDD=O  
#undef THIS_FILE "@rXN"4  
static char THIS_FILE[] = __FILE__; m =%yZ2F;  
#endif =5#sB*  
#define IDM_SHELL WM_USER+1 ;b^"b{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); FyA0"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !}L cJ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; A'T: \Wl  
class CAboutDlg : public CDialog en29<#8TO  
{ {r1}ACw{  
 public: U Kf0cU  
  CAboutDlg(); Ia-nA|LBxI  
  // Dialog Data z&Lcl{<MA  
  //{{AFX_DATA(CAboutDlg) V)cL=4G  
  enum { IDD = IDD_ABOUTBOX }; `<* tp@  
  //}}AFX_DATA U46Z~B  
  // ClassWizard generated virtual function overrides sF p% T4j  
  //{{AFX_VIRTUAL(CAboutDlg) a/U4pSug  
 protected: {@>6E8)H5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support SaA-Krn  
  //}}AFX_VIRTUAL |\SwZTr  
  // Implementation lM[FT=M  
 protected: 1^y^b{  
  //{{AFX_MSG(CAboutDlg) )%~<EJ*&Z  
  //}}AFX_MSG $J]o\~Z J  
  DECLARE_MESSAGE_MAP() ~P!%i9e_  
}; io*iA<@Gx  
r*t\F& D  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) rY]QTS">o  
{ r $&WwH2^  
 //{{AFX_DATA_INIT(CAboutDlg) {S5j;  
 //}}AFX_DATA_INIT ,\D* =5  
} IeGVLC  
2g%p9-MO]I  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 8o!LgT5  
{ "%K[kA6  
 CDialog::DoDataExchange(pDX); FuFA/R=x/  
 //{{AFX_DATA_MAP(CAboutDlg) *hkNJ  
 //}}AFX_DATA_MAP zl@hg<n  
} "[\),7&03  
I=K|1  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 6|]e}I@<2  
 //{{AFX_MSG_MAP(CAboutDlg) WXCZ }l  
 // No message handlers | gP%8nh'C  
 //}}AFX_MSG_MAP Oi\,clR^[o  
END_MESSAGE_MAP() G*rlU  
1g_Dkv|D  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) y!jq!faqt  
: CDialog(CCaptureDlg::IDD, pParent) MLt'tzgl  
{ n{xL1A=9  
 //{{AFX_DATA_INIT(CCaptureDlg) ,=`iQl3(y/  
  m_bControl = FALSE; 0 LIRi%N5*  
  m_bAlt = FALSE; rjL4t^rT  
  m_bShift = FALSE; b1-'q^M  
  m_Path = _T("c:\\"); 0v'!(&m  
  m_Number = _T("0 picture captured."); wZKEUJpQ  
  nCount=0; 8U7X/L  
  bRegistered=FALSE; @;h$!w<  
  bTray=FALSE; fb D  
 //}}AFX_DATA_INIT `8G {-_  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9Vtn62+  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6Wc'5t3  
} ~a` vk@8  
4>t=r\"4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) _BBs{47{E  
{ $Ce;}sM  
 CDialog::DoDataExchange(pDX); |TCg`ZS`cZ  
 //{{AFX_DATA_MAP(CCaptureDlg) jT1^oXn@  
  DDX_Control(pDX, IDC_KEY, m_Key); jQ9i<-zc  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); uui3jZ:  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ,w0Io   
  DDX_Check(pDX, IDC_SHIFT, m_bShift); lW3wmSWn%  
  DDX_Text(pDX, IDC_PATH, m_Path); d@>1m:p  
  DDX_Text(pDX, IDC_NUMBER, m_Number); _vr;cjMI  
 //}}AFX_DATA_MAP K)9+3(?  
} g0A,VX:2  
v}BXH4&Y  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) &KVXU0F^z  
//{{AFX_MSG_MAP(CCaptureDlg) : 5<u!-}  
 ON_WM_SYSCOMMAND() 4?.L+wL  
 ON_WM_PAINT() W4n(6esO  
 ON_WM_QUERYDRAGICON() L3y`*&e>  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) XcM.<Dn3  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) C^nTLw;K  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ($[)Tcq*~  
//}}AFX_MSG_MAP s.XLC43Rs  
END_MESSAGE_MAP() |oV_7%mlu  
B%/N{i*Z  
BOOL CCaptureDlg::OnInitDialog() @&GfCg5Cb  
{ 29r(Y  
 CDialog::OnInitDialog(); =JfSg'7  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); GKa_6X_  
 ASSERT(IDM_ABOUTBOX < 0xF000); Eg 8rgiU  
 CMenu* pSysMenu = GetSystemMenu(FALSE); o1)8?h  
 if (pSysMenu != NULL) (bON[6OGm  
 { x`VA3nE9  
  CString strAboutMenu; IHvrx:7  
  strAboutMenu.LoadString(IDS_ABOUTBOX); CyD)=e {  
  if (!strAboutMenu.IsEmpty()) X!!3>`|  
  { fm&pxQjg  
   pSysMenu->AppendMenu(MF_SEPARATOR); 6;#Rd|  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ]c\d][R N  
  } % n~ 'UA  
 } )@a_|q@V  
 SetIcon(m_hIcon, TRUE); // Set big icon x0$#8  
 SetIcon(m_hIcon, FALSE); // Set small icon (?lKedA>2  
 m_Key.SetCurSel(0); zb& 3{,  
 RegisterHotkey(); j xTYW)E   
 CMenu* pMenu=GetSystemMenu(FALSE); {q|Om?@  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); J:oAzBFpA  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); |}naI_Qudv  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4$_:a?9  
 return TRUE; // return TRUE unless you set the focus to a control G2 !J`}  
} &AhkP=Yw  
zHk7!|%Y  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) TI}Y U  
{ q@Oe}  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) {`=k$1  
 { y$U(oIU>  
  CAboutDlg dlgAbout; FgTWym_  
  dlgAbout.DoModal(); ]Ofs, U^  
 } Pj{Y  
 else 22FHD4  
 { /L*JHNu"_  
  CDialog::OnSysCommand(nID, lParam); .l +yK-BZ  
 } BSHtoD@e7  
} [LDY;k~5+  
vnD `+y  
void CCaptureDlg::OnPaint() 0*XCAnJ^_  
{ <zt124y-6  
 if (IsIconic()) $#/f+kble  
 { ^s_7-p])(  
  CPaintDC dc(this); // device context for painting `$i/f(t6`  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ^!sIEL  
  // Center icon in client rectangle .vWwYG  
  int cxIcon = GetSystemMetrics(SM_CXICON); YK%rTbB(  
  int cyIcon = GetSystemMetrics(SM_CYICON); ,#Mt10e{  
  CRect rect; *5d6Q   
  GetClientRect(&rect); eq,`T;  
  int x = (rect.Width() - cxIcon + 1) / 2; pgEDh^[MW  
  int y = (rect.Height() - cyIcon + 1) / 2; vk.P| Y-;  
  // Draw the icon N Nw0 G&  
  dc.DrawIcon(x, y, m_hIcon); 8=,-r`oNy  
 } (qdvvu#E  
 else LGT?/ gup  
 { 'ocPG.PaU  
  CDialog::OnPaint(); XN}^:j_2  
 } P9jPdls  
} ?3a:ntX h  
F P>.@ Y  
HCURSOR CCaptureDlg::OnQueryDragIcon() xASH- 9  
{ ]3]=RuQK2  
 return (HCURSOR) m_hIcon; 3H ,?ZFFGz  
} Er@OmNT  
Ri;_ 8v[H|  
void CCaptureDlg::OnCancel() Aqo90(jffx  
{ r>cN,C  
 if(bTray) &l?AC%a5  
  DeleteIcon(); 6o<(,\ad [  
  CDialog::OnCancel(); |(3"_  
} i6)HC  
{B[ }}wX$  
void CCaptureDlg::OnAbout() Nx=rw h  
{ ]_43U` [#  
 CAboutDlg dlg; y85R"d  
 dlg.DoModal(); cUC!'+L  
} aM YtWj  
/_</m?&.U&  
void CCaptureDlg::OnBrowse() +0g L!r  
{ tR(nD UHV5  
 CString str; ~Xz?H=}U+  
 BROWSEINFO bi; 9nS fFGu  
 char name[MAX_PATH]; /X%+z5  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); vX|5*T`(  
 bi.hwndOwner=GetSafeHwnd(); 3@\J#mR  
 bi.pszDisplayName=name; #jM-XK  
 bi.lpszTitle="Select folder"; Bu"5NB  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; T,h 9xl9i  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); wEC,Mbn  
 if(idl==NULL) FaQc@4%o  
  return; uYC1}Y5N  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); nYE%@Up  
 str.ReleaseBuffer(); OXI>`$we  
 m_Path=str; :f~qt%%/  
 if(str.GetAt(str.GetLength()-1)!='\\') }/2M?W0  
  m_Path+="\\"; (9Q@I8}Iy  
 UpdateData(FALSE); "/Pq/\,R|  
} <nc6 &+  
Y`rli  
void CCaptureDlg::SaveBmp() nt8& Mf  
{ w|c200Is}e  
 CDC dc; iF Zqoz  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Oi<yT"7  
 CBitmap bm; X}H?*'-  
 int Width=GetSystemMetrics(SM_CXSCREEN); U=PTn(2  
 int Height=GetSystemMetrics(SM_CYSCREEN); ^@^K <SVc  
 bm.CreateCompatibleBitmap(&dc,Width,Height); `T{'ufI4B  
 CDC tdc; 9_fbl:qk;\  
 tdc.CreateCompatibleDC(&dc); |enb5b78  
 CBitmap*pOld=tdc.SelectObject(&bm);  zPN:)  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); iFnD`l 6)  
 tdc.SelectObject(pOld); BhhFij4  
 BITMAP btm; xZA.<Yd^r  
 bm.GetBitmap(&btm); 1Eb2X}XC  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 1>Q4&1Vn  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Ll .P>LH  
 BITMAPINFOHEADER bih; J";4+wA7  
 bih.biBitCount=btm.bmBitsPixel; \/ ipYc  
 bih.biClrImportant=0; /xj`'8  
 bih.biClrUsed=0; Xy r'rm5+b  
 bih.biCompression=0; ["[v  
 bih.biHeight=btm.bmHeight; )]kxLf#  
 bih.biPlanes=1; Whe-()pG{  
 bih.biSize=sizeof(BITMAPINFOHEADER); 9g]%}+D  
 bih.biSizeImage=size; c(aykIVOo  
 bih.biWidth=btm.bmWidth; |}b~YHTs  
 bih.biXPelsPerMeter=0; 7}vI/?r  
 bih.biYPelsPerMeter=0; kpXxg: c  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); zd/kr  
 static int filecount=0; me@)kQ8M  
 CString name; DTG-R>y^  
 name.Format("pict%04d.bmp",filecount++); Jj?HOtaM  
 name=m_Path+name; O]' 2<;  
 BITMAPFILEHEADER bfh; ;Y0M]pC  
 bfh.bfReserved1=bfh.bfReserved2=0; p6!5}dD(  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Ft38)T"2R\  
 bfh.bfSize=54+size; x#gZC 1$Y  
 bfh.bfOffBits=54; nW}jTBu_K+  
 CFile bf; <@P. 'rE  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ LosRjvQ:  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); v3]5`&3~  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); b~r:<:;  
  bf.WriteHuge(lpData,size); '$),i>6gJ  
  bf.Close();  TD%&9$F  
  nCount++; %uCsCl  
 } |Z)}-'QUJ  
 GlobalFreePtr(lpData); ] E:NmBN<  
 if(nCount==1) @dx 8{oQ  
  m_Number.Format("%d picture captured.",nCount); U$Z<lx2P  
 else 7Mk>`4D'c  
  m_Number.Format("%d pictures captured.",nCount); k7j.VpN9  
  UpdateData(FALSE); *jvP4Nz)k  
} | 1zfXG,R  
FPH2dN  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) @yo6w}3+-  
{ 9 p{n7.  
 if(pMsg -> message == WM_KEYDOWN) z%#-2&i  
 { L^*f$Balz  
  if(pMsg -> wParam == VK_ESCAPE) Bal e_s^  
   return TRUE; 3!$+N\ #w  
  if(pMsg -> wParam == VK_RETURN) =fJU+N+<  
   return TRUE; D,Gv nfY  
 } h3-^RE5\`S  
 return CDialog::PreTranslateMessage(pMsg); -+Ot' ^  
} tDRo)z  
d%.|MAE  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) E- [Eg  
{ V:>r6  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ n_Qua|R  
  SaveBmp(); X</Sl>[8  
  return FALSE; ul#y'iY]  
} +80bG(I_  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ P;o  {t  
 CMenu pop; JsNj!aeU%  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); qS9<_if2  
 CMenu*pMenu=pop.GetSubMenu(0); D'vaK89\  
 pMenu->SetDefaultItem(ID_EXITICON); 3&CV!+z  
 CPoint pt; :;eQ*{ `\  
 GetCursorPos(&pt); WMC\J(@.  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); T0Xm}i  
 if(id==ID_EXITICON) cc3B}^@p=  
  DeleteIcon(); q ajZ~oB{  
 else if(id==ID_EXIT) [T,Hpt  
  OnCancel(); 2x9.>nwhb  
 return FALSE; i1XRB C9  
} l5.k2{'  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ^lt2,x   
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ZE-vroh  
 AddIcon(); A]TEs)#*7)  
 return res;  V?1[R  
} =yz"xWH  
#:+F  
void CCaptureDlg::AddIcon() ti (Hx  
{ 57EX#:a  
 NOTIFYICONDATA data; Le:C8^  
 data.cbSize=sizeof(NOTIFYICONDATA); [^s;Ggi9  
 CString tip; s .<.6t:G4  
 tip.LoadString(IDS_ICONTIP); G;flj}z  
 data.hIcon=GetIcon(0); q&J5(9]O|L  
 data.hWnd=GetSafeHwnd(); $y&W:  
 strcpy(data.szTip,tip); 8["%e#%`$  
 data.uCallbackMessage=IDM_SHELL; pZ}B/j  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; n1{[CCee@  
 data.uID=98; i@.Tv.NZ  
 Shell_NotifyIcon(NIM_ADD,&data); / Ws>;0  
 ShowWindow(SW_HIDE); &3Yj2 Fw  
 bTray=TRUE; u*): D~A  
} }6!/Nb  
C#nT@;VO5  
void CCaptureDlg::DeleteIcon() 2.I|8d[  
{ ge1. HG  
 NOTIFYICONDATA data; |=*)a2  
 data.cbSize=sizeof(NOTIFYICONDATA); M:GpyE%  
 data.hWnd=GetSafeHwnd(); nj:w1E/R  
 data.uID=98; "3\y~<8%'  
 Shell_NotifyIcon(NIM_DELETE,&data); ||>4XDV#  
 ShowWindow(SW_SHOW); hNsi  8/  
 SetForegroundWindow(); `MCiybl,&P  
 ShowWindow(SW_SHOWNORMAL); *U,J Q  
 bTray=FALSE; NS2vA>n8R  
} Vx2/^MiXy  
~HhB@G!3  
void CCaptureDlg::OnChange() 8T9 s:/%  
{ .Y{x!Q"  
 RegisterHotkey(); @, GL&$Y:W  
} \Q(a`6U  
Lv]%P.=[G  
BOOL CCaptureDlg::RegisterHotkey() "A"YgD#t  
{ Qy0w'L/@  
 UpdateData(); bf0,3~G,P  
 UCHAR mask=0; o+&Om~W  
 UCHAR key=0; T>'O[=UWh  
 if(m_bControl) ,wes*  
  mask|=4; #55:qc>m  
 if(m_bAlt) 4qp|g'uXT  
  mask|=2; G(.G>8pf  
 if(m_bShift) n 5R9<A^  
  mask|=1; oG1zPspL  
  key=Key_Table[m_Key.GetCurSel()]; WM?-BIlT=  
 if(bRegistered){ W/bW=.d Jd  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); - [h[  
  bRegistered=FALSE; #i@f%Bq-  
 } TDDMx |{  
 cMask=mask; yy=hCjQ)  
 cKey=key; } LS8q  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 4h@,hY1#  
 return bRegistered; !(F?`([A  
} Hz GwO^tbK  
(O4oI U  
  四、小结 _\X ,a5Un  
j=irx5:  
  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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