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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: A{3VTe4TV  
  J0xV\O !e  
  一、实现方法 )?es3Ehqq  
jhU'UAn  
  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: Vqr#%. N  
OUoN  
#pragma data_seg("shareddata") y;oPg4  
HHOOK hHook =NULL; //钩子句柄 :zN{>,sC  
UINT nHookCount =0; //挂接的程序数目 >iE/t$%1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 T["(wPrt  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 K ?R* )_  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ep|>z#1  
static int KeyCount =0; v[-.]b*5A$  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 v D"4aw  
#pragma data_seg() RRXnj#<g  
\9r1JP0  
  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。 ~=xiMB;oH  
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  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: ^g^R[8  
dY|~"6d)  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR HP/f`8  
cKey,UCHAR cMask) \OR=+\].9  
{ .K I6<k/  
 BOOL bAdded=FALSE; "}"hQ.kAz  
 for(int index=0;index<MAX_KEY;index++){ _c[Bjip  
  if(hCallWnd[index]==0){ Wd9y8z;  
   hCallWnd[index]=hWnd; VTM*=5|c   
   HotKey[index]=cKey; OAlV7cfD  
   HotKeyMask[index]=cMask; #Tm^$\*h\]  
   bAdded=TRUE; }q8 |t3  
   KeyCount++; "$@>n(w  
   break; x?5D>M/Y  
  } {Y0Uln5u  
 } F?h{IH f  
 return bAdded; {0~ Sj%Ze  
} >"Tivc5  
//删除热键 8\V  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S}mZU!  
{ V?_:-!NJ(  
 BOOL bRemoved=FALSE; 3 VNPdXsh  
 for(int index=0;index<MAX_KEY;index++){ ]'  ck!eG  
  if(hCallWnd[index]==hWnd){ i -kj6N5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^a,Oi%  
    hCallWnd[index]=NULL; _f^JXd,7v  
    HotKey[index]=0; }vx+/J  
    HotKeyMask[index]=0; fLGZ@-qA0  
    bRemoved=TRUE; i!AFXVX  
    KeyCount--; 'r/+z a:2  
    break; ]6)~Sj$ 5  
   } Ev%_8CO4e  
  } $9~6M*  
 } H YA<  
 return bRemoved; _BC%98:WP  
} ,}8|[)"  
)\xDo<@  
Hj\iI p  
  DLL中的钩子函数如下: . N:& {$o:  
9YMD[H\}V  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) bQTkW<7gh  
{ |{STkV]  
 BOOL bProcessed=FALSE; oSAO0h>0N  
 if(HC_ACTION==nCode) @ OSSqH  
 { wWh)yfPh8H  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 htgtgW9 ^P  
   switch(wParam) ON.1'Wk?  
   {  /Soc,PjZ  
    case VK_MENU: LtJl\m.th  
     MaskBits&=~ALTBIT; B\<;e  
     break; {hP_"nN#  
    case VK_CONTROL: vOF"p4 ^3  
     MaskBits&=~CTRLBIT; W{)RJ1  
     break; U3oMY{{E J  
    case VK_SHIFT: )(4.7>  
     MaskBits&=~SHIFTBIT; E((U=P}+g  
     break; goJK~d8M*  
    default: //judge the key and send message XA1gV>SJ  
     break; ~4T:v _Q7g  
   } tAi ~i;?  
   for(int index=0;index<MAX_KEY;index++){ N*B_ or  
    if(hCallWnd[index]==NULL) .m;5s45O{  
     continue; r2h{#2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X npn{  
    { < 2 mbR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); K[j~htC{I"  
     bProcessed=TRUE; ktEdbALK  
    } vq?aFX9F  
   } P5$L(x%~  
  } b235Zm  
  else if((lParam&0xc000ffff)==1){ //有键按下 6g6BE^o\  
   switch(wParam) hxT{!g  
   { T09'qB  
    case VK_MENU: QDHTP|2e  
     MaskBits|=ALTBIT; {S$]I)tV  
     break; mdNIC  
    case VK_CONTROL: s MZ90Q$  
     MaskBits|=CTRLBIT; +N3f{-{"Yo  
     break; X~o6Xkg  
    case VK_SHIFT: zJMm=Mw^  
     MaskBits|=SHIFTBIT; >QA;02  
     break; =sIkA)"!=  
    default: //judge the key and send message -wdd'G  
     break; 8AGP*"gI  
   } Y|3n^%I  
   for(int index=0;index<MAX_KEY;index++){ uOv0ut\\G  
    if(hCallWnd[index]==NULL) F5+)=P#  
     continue; gfPR3%EXs  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'xG:v)(  
    { CAJ]@P#Xj+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ==ZL0 ][  
     bProcessed=TRUE; xNAa,aMM  
    } K}feS(Ji  
   } x^959QO~  
  } ?c6`p3p3L  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 \F'tl{'\@  
   for(int index=0;index<MAX_KEY;index++){ #GVf+8"  
    if(hCallWnd[index]==NULL) 02F\1fXS  
     continue; 0!5w0^1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Vx#n0z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); UVUoXv)N  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 "3Lq/mJYnZ  
   } =[D '3JB  
  } 7jzd I!  
 } P2t9RCH  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Ia%S=xU{=  
} "BvAiT{u  
2zlBrjk;  
  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: N ,0&xg3  
,| Zkpn8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |ZmWhkOX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;) (F4  
ej;\a:JL  
  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: 1${rQ9FIF  
.dQEr~f#}  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ZDl6 F`  
{ C?h}n4\B^?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) aBblP8)8;K  
 { 7O]$2  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 0Q)m>oL.  
  SaveBmp(); ?]/"AWUX  
  return FALSE; qi]"`\  
 } lmbC2\GT  
 …… //其它处理及默认处理 T[\?fSP  
} a j13cC$  
@ |^;d  
F4|U\,g  
  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。 )Zbrg~-@  
]N4?*S*jd)  
  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。 {~0r3N4Zl  
":Uv u[-  
  二、编程步骤 .?NraydwV  
D6NgdE7b  
  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"; #bZT&YE^  
YacLYo#  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 2)4oe  
ELgq#z  
  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; LO@='}D=  
CS\T@)@t  
  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; P7|x=Ew;`  
b!gvvg<  
  5、 添加代码,编译运行程序。 g7g^iLU  
tEl_a~s*3?  
三、程序代码 a`E1rK'  
+)U>mm,  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL --BS/L-  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) C/{%f,rU  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ oRZ--1oR_  
#if _MSC_VER > 1000 IM8lA  
#pragma once rI;84=v2&9  
#endif // _MSC_VER > 1000 %7 [ Z/U=  
#ifndef __AFXWIN_H__ d'UCPg<Y  
#error include 'stdafx.h' before including this file for PCH Cj3C%W  
#endif >sl#2,br  
#include "resource.h" // main symbols .{ -C*  
class CHookApp : public CWinApp N^@aO&+A  
{ j3_vh<U\  
 public: /{sFrEMP\  
  CHookApp(); WcZck{ehd  
  // Overrides o>?#$~XNv  
  // ClassWizard generated virtual function overrides eUZvJTE  
  //{{AFX_VIRTUAL(CHookApp) Z+M* z;  
 public: N799@:.  
  virtual BOOL InitInstance(); $^Z ugD  
  virtual int ExitInstance(); 9yWQ}h  
  //}}AFX_VIRTUAL >j}.~$6dj_  
  //{{AFX_MSG(CHookApp) m6iQB\ \  
  // NOTE - the ClassWizard will add and remove member functions here. e)): U  
  // DO NOT EDIT what you see in these blocks of generated code ! d7i 0'R  
  //}}AFX_MSG ITr@;@}c]  
  DECLARE_MESSAGE_MAP() kr{eC/Q"  
}; ^wTod\y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); xu(N'l.7&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )|Xi:Zd5>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]O 8hkGa  
BOOL InitHotkey(); FNgC TO%  
BOOL UnInit(); ,5J}Wo?Q}  
#endif @p$$BUb  
v#`7,::  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. n04lTME  
#include "stdafx.h" l 4e`-7  
#include "hook.h" M~"93Q`f^  
#include <windowsx.h> z]33_[G1U  
#ifdef _DEBUG 1_V',0|`>  
#define new DEBUG_NEW JV_V2L1Ut  
#undef THIS_FILE nhb: y  
static char THIS_FILE[] = __FILE__;  _YPu  
#endif FAbl5VW'  
#define MAX_KEY 100 L.R4 iN  
#define CTRLBIT 0x04 ^f_4w|u,+  
#define ALTBIT 0x02 'A)r)z {X  
#define SHIFTBIT 0x01 #}|g8gh  
#pragma data_seg("shareddata") Xn3 \a81  
HHOOK hHook =NULL; x !^u$5c  
UINT nHookCount =0; KXvBJA$  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ReZ&SNJ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT u~\I  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey s$PPJJT{b  
static int KeyCount =0; +L>?kr[i[  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift WB(Gx_o3  
#pragma data_seg() S3F8Chk5  
HINSTANCE hins; w$j!89@)  
void VerifyWindow(); pj/w9j G6  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ML-?#jNa<  
//{{AFX_MSG_MAP(CHookApp) SU80i`  
// NOTE - the ClassWizard will add and remove mapping macros here. G}ccf%  
// DO NOT EDIT what you see in these blocks of generated code! j c-$l  
//}}AFX_MSG_MAP wD|I^y;  
END_MESSAGE_MAP() =lG/A[66  
{- Y.C*E  
CHookApp::CHookApp() y>jP]LR4  
{ HI%#S&d  
 // TODO: add construction code here, 9}*<8%PSt,  
 // Place all significant initialization in InitInstance dSq3V#Q  
} .Mz'h 9@  
l.@&B@5F  
CHookApp theApp; -er8(snDQ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ed:[^#Lj  
{ >cYYr@S  
 BOOL bProcessed=FALSE; 2uy<wJE >  
 if(HC_ACTION==nCode) ocDAg<wo  
 { ]46#u=y~3  
  if((lParam&0xc0000000)==0xc0000000){// Key up | l|7[  
   switch(wParam) #[ZNiaWT  
   { zd-qQ.j0  
    case VK_MENU: (yxHXO9N  
     MaskBits&=~ALTBIT; [Z$E^QAP  
     break; \\{+t<?J  
    case VK_CONTROL: 2SHS!6:Rl  
     MaskBits&=~CTRLBIT; 5ON\Ve_H  
     break; "GY/2;  
    case VK_SHIFT: j8 |N;;MN  
     MaskBits&=~SHIFTBIT; QxS=W2iN  
     break; Qqn9nO9  
    default: //judge the key and send message C<u<:4^H  
     break; ObIL  w  
   } w/UZ6fu  
   for(int index=0;index<MAX_KEY;index++){ 3qNLosm#M  
    if(hCallWnd[index]==NULL) (//f"c]/  
     continue; Gr}lr gPS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3sF^6<E  
    { hCFgZiH2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); O[RivHCY  
     bProcessed=TRUE; yK"T5^o  
    } 6<>T{2b:(p  
   } IwJ4K+  
  } OD~B2MpM>  
  else if((lParam&0xc000ffff)==1){ //Key down x!R pRq9  
   switch(wParam) C]'ru  
   { I?Fv!5p  
    case VK_MENU: yG..B  
     MaskBits|=ALTBIT; :,[=g$CT:  
     break; d]!`II  
    case VK_CONTROL: ~f5g\n;  
     MaskBits|=CTRLBIT; 'vc>uY  
     break; #BLmT-cl  
    case VK_SHIFT: 75?z" i  
     MaskBits|=SHIFTBIT; G}8Zkz@+  
     break; ~P;KO40K  
    default: //judge the key and send message /ij)[WK@  
     break; ;.EW7`)Z  
   } Vq>$ZlvS  
   for(int index=0;index<MAX_KEY;index++) 4k4 d%  
   { h#o?O k  
    if(hCallWnd[index]==NULL) \[yg f6#[  
     continue; guc[du  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \Jy/ a-  
    { 8AgKK=C =  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); kD.KZV  
     bProcessed=TRUE; jSc!"Trl]  
    } bxR6@  
   } e$=UA%  
  } H)VzPe#{  
  if(!bProcessed){ BfUM+RC%5  
   for(int index=0;index<MAX_KEY;index++){ uS}qy-8J  
    if(hCallWnd[index]==NULL) `j)S7KN  
     continue; L$rMfe S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) jS<(O o  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %f'mW2  
   } (]gd$BgD  
  } noL&>G  
 } pN?geF~t|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]~!?(d!J/  
} Al-;-t#Dc  
PT/TQW  
BOOL InitHotkey() '2X6 >6`w  
{ s. ]<r5v7  
 if(hHook!=NULL){ n4%ZR~9WH  
  nHookCount++; (Xv' Te?  
  return TRUE; 4SDUTRo a  
 } SSo7 U  
 else Nt'6Y;m!  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ,C97|6rC  
  if(hHook!=NULL) Md[M}d8  
   nHookCount++; |0N6]%r  
  return (hHook!=NULL); MFzJ 8^.1R  
} b;k3B7<  
BOOL UnInit() \{u 9Kc  
{ =R6IW,*  
 if(nHookCount>1){ IMcuoQ5  
  nHookCount--; R&MdwTa  
  return TRUE; VxA?LS`  
 } Ql8s7%  
 BOOL unhooked = UnhookWindowsHookEx(hHook); |x#w8=VP-  
 if(unhooked==TRUE){ ]/ffA|"U`  
  nHookCount=0; R!Lh ~~@{(  
  hHook=NULL; c+A$ [  
 } 1XXuFa&  
 return unhooked; G~ mLc  
} %<]4]h  
Q /zlU@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;eY.4/*R  
{ !> 2kH  
 BOOL bAdded=FALSE; E>I\m!ue  
 for(int index=0;index<MAX_KEY;index++){ )Bw}T  
  if(hCallWnd[index]==0){ rZ#ZY  
   hCallWnd[index]=hWnd; J1UG},-h  
   HotKey[index]=cKey; 50jZu'z:  
   HotKeyMask[index]=cMask; )Gm,%[?2C  
   bAdded=TRUE; $~c wB  
   KeyCount++;  Qo$j'|lD  
   break; BL[N  
  } CFTw=b@  
 } oT0TbZu%  
 return bAdded; +{h.nqdAE  
} SPN5H;{[]K  
kJ[r.)HU  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) P+:DLex  
{ }5]2tH${  
 BOOL bRemoved=FALSE; uEui{_2$  
 for(int index=0;index<MAX_KEY;index++){ {$xt.<  
  if(hCallWnd[index]==hWnd){ NXHe;G  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ u8Ak2:   
    hCallWnd[index]=NULL; \` U=pZJ  
    HotKey[index]=0; XT%\Ce!  
    HotKeyMask[index]=0; r\T'_wo  
    bRemoved=TRUE; /nWBol,  
    KeyCount--; SUC'o"  
    break; E*AI}:or;  
   } @s.civ!Yk  
  } sXaudT  
 } N3(.7mxo  
 return bRemoved; ORx6r=zg  
} qd<-{  
nghpWODq  
void VerifyWindow() v2l*n  
{ cw3j&k  
 for(int i=0;i<MAX_KEY;i++){ W7#dc89}  
  if(hCallWnd!=NULL){ 8vqx}2  
   if(!IsWindow(hCallWnd)){ vdIert?p  
    hCallWnd=NULL; Bw/8-:eb  
    HotKey=0; %urd;h D  
    HotKeyMask=0; x:$ xtu  
    KeyCount--; |R&cQKaQ`  
   } !rsGCw!Pg  
  } ?>s[B7wMp  
 } 'W*:9wah  
} l0w<NZ F  
^_gH}~l+U  
BOOL CHookApp::InitInstance() e);`hNLih  
{ Z^!% b  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); "IN[(  
 hins=AfxGetInstanceHandle(); Qg]+&8!*  
 InitHotkey(); +3F%soum95  
 return CWinApp::InitInstance(); =1Hn<Xay0  
} p?2^JJpUb  
R8-=N+hX  
int CHookApp::ExitInstance() /b7]NC%  
{ 92x)Pc^D  
 VerifyWindow(); SA?lDRF  
 UnInit(); PH$C."Vv  
 return CWinApp::ExitInstance(); U'aJCM  
} = glF6a  
V}X>~ '%  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 74r$)\q  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) FrC)2wX  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ P W_"JZ  
#if _MSC_VER > 1000 `gAW5 i-z5  
#pragma once Z`<5SHQd  
#endif // _MSC_VER > 1000 oy-y Q YX  
H/U.Bg 4  
class CCaptureDlg : public CDialog v\o m  
{ ezb*tN!  
 // Construction Ao+6^z_  
 public: />n!2'!  
  BOOL bTray; `a `>Mtl  
  BOOL bRegistered; yV*jc`1  
  BOOL RegisterHotkey(); |Iknk,  
  UCHAR cKey; kvG.?^ v  
  UCHAR cMask; Lpohc4d[V  
  void DeleteIcon(); *,|x p  
  void AddIcon(); zY9CoadZ  
  UINT nCount; zygH-3C7o  
  void SaveBmp(); Ae\:{[c_D  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 6WX?Xc]$3  
  // Dialog Data 3Cgv($xl&  
  //{{AFX_DATA(CCaptureDlg) "5204I  
  enum { IDD = IDD_CAPTURE_DIALOG }; a+RUSz;DL  
  CComboBox m_Key; V :/v r  
  BOOL m_bControl; I?RUVs  
  BOOL m_bAlt; I? ="Er[g}  
  BOOL m_bShift; >n3ig~0d  
  CString m_Path; p:V1VHT,  
  CString m_Number; M`n0 q y  
  //}}AFX_DATA }kG>6_p?  
  // ClassWizard generated virtual function overrides Rl&nR$#  
  //{{AFX_VIRTUAL(CCaptureDlg) tOX -vQ  
 public: ,xg-H6Xfa{  
  virtual BOOL PreTranslateMessage(MSG* pMsg); T+q5~~\d  
 protected: %l?*w~x  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $*`E;}S0  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &NOCRabc  
  //}}AFX_VIRTUAL @?>5~  
  // Implementation eA*We  
 protected: fA"c9(>m%]  
  HICON m_hIcon; Q zg?#|  
  // Generated message map functions Hy5 6@jW+E  
  //{{AFX_MSG(CCaptureDlg) 6LrI,d  
  virtual BOOL OnInitDialog(); _Wq;bKG  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 31\mF\{V  
  afx_msg void OnPaint(); Z;S)GUG^  
  afx_msg HCURSOR OnQueryDragIcon(); "~S2XcR[ E  
  virtual void OnCancel(); 0{ _6le]  
  afx_msg void OnAbout(); 2}XxRJ0   
  afx_msg void OnBrowse(); c/^l2CJ0  
  afx_msg void OnChange(); 4 |bu= T  
 //}}AFX_MSG fR?'HsQg  
 DECLARE_MESSAGE_MAP() %}JSR y  
}; O0;mXH  
#endif +@c$n`>)  
=KAN|5yn  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ?D|kCw69SE  
#include "stdafx.h" * =*\w\ te  
#include "Capture.h" L1WvX6  
#include "CaptureDlg.h" *pDS%,$xe  
#include <windowsx.h> U&43/;<,  
#pragma comment(lib,"hook.lib") X"vDFE`?  
#ifdef _DEBUG I:w+lchAMe  
#define new DEBUG_NEW 1_TniR3z1  
#undef THIS_FILE hYh~%^0dt  
static char THIS_FILE[] = __FILE__; \TYVAt] ?  
#endif _DAqL@5n  
#define IDM_SHELL WM_USER+1 &*bpEdkZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v_WF.sb~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8H1&=)M=  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ~!M"  
class CAboutDlg : public CDialog );h  
{ XD" 4t4~>  
 public: @+1AYVz(k  
  CAboutDlg(); B`gH({U  
  // Dialog Data ZuZCIqN  
  //{{AFX_DATA(CAboutDlg) D^a(|L3;  
  enum { IDD = IDD_ABOUTBOX }; :wEy""*N0  
  //}}AFX_DATA q&}+O  
  // ClassWizard generated virtual function overrides i9V,  
  //{{AFX_VIRTUAL(CAboutDlg) /EJy?TON*  
 protected: !x\\# 9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .s?^y+e_  
  //}}AFX_VIRTUAL : sw@1  
  // Implementation z`eMb  
 protected: :Gzp (@<@e  
  //{{AFX_MSG(CAboutDlg) f]mVM(XZN  
  //}}AFX_MSG R\Ckk;<$  
  DECLARE_MESSAGE_MAP() OI8}v  
}; \%9QE  
;JMmr-@  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) yu@Pd3  
{ `~_H\_JpO  
 //{{AFX_DATA_INIT(CAboutDlg) |WpJen*?Y  
 //}}AFX_DATA_INIT \j-:5M#m  
} Sx (E'?]  
|qwx3 hQ?  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) f@$kK?c?  
{ d'H gek{T  
 CDialog::DoDataExchange(pDX); gX$gUB) x  
 //{{AFX_DATA_MAP(CAboutDlg) xJnN95`R@  
 //}}AFX_DATA_MAP ;.rY`<|  
} JStEOQF4  
^.  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) mB6%. "  
 //{{AFX_MSG_MAP(CAboutDlg) o9yUJ@ :i  
 // No message handlers ep0dT3&  
 //}}AFX_MSG_MAP K`60[bdp  
END_MESSAGE_MAP() ];5Auh 0o  
(9=E5n6o  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) vP+qwvpGr  
: CDialog(CCaptureDlg::IDD, pParent) Oqt{ uTI~  
{ d(@ ov^e-  
 //{{AFX_DATA_INIT(CCaptureDlg) yW\kmv.O  
  m_bControl = FALSE; _3NH"o d  
  m_bAlt = FALSE; 1~},}S]id  
  m_bShift = FALSE; OF )*kiJ  
  m_Path = _T("c:\\"); [Q\(k d*4  
  m_Number = _T("0 picture captured."); 3xmPY.  
  nCount=0; "zzb`T[8  
  bRegistered=FALSE; ~=t9-AF-  
  bTray=FALSE; hs:iyr]@9  
 //}}AFX_DATA_INIT ie>mOsz  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Eau V  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); +?[s"(  
} )>^Ge9d]  
]"htOO  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) \ rg;xZa5  
{ ?<5KLvGv  
 CDialog::DoDataExchange(pDX); `B:hXeI  
 //{{AFX_DATA_MAP(CCaptureDlg) rhX?\_7o  
  DDX_Control(pDX, IDC_KEY, m_Key); CJw zjH  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); o*"Q{Xh#Qd  
  DDX_Check(pDX, IDC_ALT, m_bAlt); \m1^sFMZ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); d2)]6)z6  
  DDX_Text(pDX, IDC_PATH, m_Path); fZLAZMrM  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 8<32(D{  
 //}}AFX_DATA_MAP E1`_[=8a9  
} R~|(]#com  
${}9/(x/^  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 2- (}=N  
//{{AFX_MSG_MAP(CCaptureDlg)  B@*!>R  
 ON_WM_SYSCOMMAND() >6@,L+-6r  
 ON_WM_PAINT() &3x da1H  
 ON_WM_QUERYDRAGICON() ?^^TR/  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) uq7/G|  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ^#K^WV  
 ON_BN_CLICKED(ID_CHANGE, OnChange) skTtGz8R[  
//}}AFX_MSG_MAP .2_xTt   
END_MESSAGE_MAP() m(EV C}Y  
:S7[<SwL  
BOOL CCaptureDlg::OnInitDialog() 57]La^#  
{ X?JtEQ~>  
 CDialog::OnInitDialog(); p,uM)LD  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Q`4I a<5B  
 ASSERT(IDM_ABOUTBOX < 0xF000);  -)KNsW  
 CMenu* pSysMenu = GetSystemMenu(FALSE); opu)9]`z  
 if (pSysMenu != NULL) rOj(THoc{  
 { AAKc8 {  
  CString strAboutMenu; ,^ dpn  
  strAboutMenu.LoadString(IDS_ABOUTBOX); h0$ \JXk  
  if (!strAboutMenu.IsEmpty()) \OWxf[  
  { Lxv_{~I*  
   pSysMenu->AppendMenu(MF_SEPARATOR); tw.z5  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Uyeo0B"  
  } 86dz Jh  
 } B(6*U~Kn%  
 SetIcon(m_hIcon, TRUE); // Set big icon .|TF /b]  
 SetIcon(m_hIcon, FALSE); // Set small icon ZP&iy$<L  
 m_Key.SetCurSel(0); =NnG[#n%  
 RegisterHotkey(); sJl>evw  
 CMenu* pMenu=GetSystemMenu(FALSE); II[-6\d!  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Ge=\IAj  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 'WBhW5@  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); a1[J>  
 return TRUE; // return TRUE unless you set the focus to a control `0w!&  
} Tu,nX'q]m  
V`YmGo  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #J8(*!I  
{ N=~DSsw  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) P3Ah1X7W"C  
 { w\V<6_[vv.  
  CAboutDlg dlgAbout; 7 s2*VKr  
  dlgAbout.DoModal(); 0tPwhJ  
 } |lu@rN  
 else =}u?1~V  
 { i .eMrzJ|  
  CDialog::OnSysCommand(nID, lParam); O'.{6H;t  
 } S&k/Pc  
} i=pfjC  
cf*~G x_l  
void CCaptureDlg::OnPaint() JS<w43/j  
{ g2rH"3sC  
 if (IsIconic()) se}$/Y}t  
 { QA)"3g   
  CPaintDC dc(this); // device context for painting nrXKS&6  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); "GJ.`Hj  
  // Center icon in client rectangle ~XvMiWuo  
  int cxIcon = GetSystemMetrics(SM_CXICON); "-AFWWKtx  
  int cyIcon = GetSystemMetrics(SM_CYICON); 1|>bG#|  
  CRect rect; f 9IqcCSW  
  GetClientRect(&rect); v |(N  
  int x = (rect.Width() - cxIcon + 1) / 2; osLEH?iKW  
  int y = (rect.Height() - cyIcon + 1) / 2; MU:v& sk  
  // Draw the icon h gwS_L  
  dc.DrawIcon(x, y, m_hIcon); HW'I$ .  
 } 77 Z:!J|  
 else CWB<I  
 { |RqCI9N6  
  CDialog::OnPaint(); /5 OQ0{8p  
 } YdB/s1|G  
} MI.OOoP3a  
U_E t  
HCURSOR CCaptureDlg::OnQueryDragIcon() 4<5*HpW  
{ %rEP.T\i  
 return (HCURSOR) m_hIcon; 9VIAOky-  
} 2Qc_TgWF  
Fta=yH }  
void CCaptureDlg::OnCancel() o>m*e7l,  
{ U9 Q[K`  
 if(bTray) *7#5pT~  
  DeleteIcon(); &XXr5ne~C  
  CDialog::OnCancel(); L&]{GNw  
} Imyw-8/;  
8|+@A1)&4  
void CCaptureDlg::OnAbout() LA(/UA3Izd  
{ kK0zb{  
 CAboutDlg dlg; ^?A>)?Sq  
 dlg.DoModal(); N f}ZG  
} [<Mls@?  
1$:O9 {F  
void CCaptureDlg::OnBrowse() m Q<Vwx0  
{ i~5'bSq c  
 CString str; =Pp-9<& S  
 BROWSEINFO bi; zY-?Bv_D  
 char name[MAX_PATH];  qzSm]l?z  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); bhfKhXh8  
 bi.hwndOwner=GetSafeHwnd(); \`-xxhb?e  
 bi.pszDisplayName=name; (&_^1  
 bi.lpszTitle="Select folder"; {7 ](-  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; g"g3|$#Ej|  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ] {0OPU  
 if(idl==NULL) a\B?J  
  return; (S6>^:;=~  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ]IDhE{  
 str.ReleaseBuffer(); V~Jt  
 m_Path=str; 6\y?+H1  
 if(str.GetAt(str.GetLength()-1)!='\\') 'I>geW?{QK  
  m_Path+="\\"; 1p<*11  
 UpdateData(FALSE); li#ep?5h^  
} gnf4H V~  
U0N6\+  
void CCaptureDlg::SaveBmp() >J:liB|(  
{ 8zjJshE/  
 CDC dc; _5OxESE  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); bJ eF1LjS  
 CBitmap bm; Sg\+al7  
 int Width=GetSystemMetrics(SM_CXSCREEN); SxkY ;^-U  
 int Height=GetSystemMetrics(SM_CYSCREEN); &7{yk$]*  
 bm.CreateCompatibleBitmap(&dc,Width,Height); zIr-Rx'dL^  
 CDC tdc; wX <ov0?[  
 tdc.CreateCompatibleDC(&dc); @Q!Tvw/  
 CBitmap*pOld=tdc.SelectObject(&bm); qmNG|U&  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ="AaC!E,W  
 tdc.SelectObject(pOld); )L_@l5l  
 BITMAP btm; /U6ry'  
 bm.GetBitmap(&btm); j|[>f  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; PM QlJ&  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); nY?&k$n  
 BITMAPINFOHEADER bih; w(*},  
 bih.biBitCount=btm.bmBitsPixel; S&Hgr_/}c  
 bih.biClrImportant=0; gTd r  
 bih.biClrUsed=0; h66mzV:`  
 bih.biCompression=0; _d>{Hz2  
 bih.biHeight=btm.bmHeight; n9Vr*RKM)  
 bih.biPlanes=1; `y{[e j  
 bih.biSize=sizeof(BITMAPINFOHEADER); ws$kwSHq  
 bih.biSizeImage=size; m;U_oxb  
 bih.biWidth=btm.bmWidth; C[><m2T  
 bih.biXPelsPerMeter=0; F8\JL %  
 bih.biYPelsPerMeter=0; 3k/X;:,.  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); AMK(-=  
 static int filecount=0; vVjk9_Ul  
 CString name; }yd!UU  
 name.Format("pict%04d.bmp",filecount++); 1`~.!yd8(  
 name=m_Path+name; J M;WCV%NM  
 BITMAPFILEHEADER bfh; F^?DnZs  
 bfh.bfReserved1=bfh.bfReserved2=0; E7I$GD  
 bfh.bfType=((WORD)('M'<< 8)|'B'); IUD@Kf]S  
 bfh.bfSize=54+size; Bt(nm> Ng  
 bfh.bfOffBits=54; Sb}=j;F  
 CFile bf; Kv ajk~  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ \Y6r !D9  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 6yC4rX!a  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); \]3[Xw-$  
  bf.WriteHuge(lpData,size);  LYyud  
  bf.Close(); .F/s (  
  nCount++; %kP=VUXj  
 } F><ficT  
 GlobalFreePtr(lpData); ]UGk"s5A  
 if(nCount==1) h1$75E?,  
  m_Number.Format("%d picture captured.",nCount); h" f_T [  
 else 7s Gf_`Z  
  m_Number.Format("%d pictures captured.",nCount); P]2V~I/X  
  UpdateData(FALSE); &#!1 Y[e^  
} a/[)A _-  
l;B  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) `(E$-m-~jH  
{ bzECNi5^  
 if(pMsg -> message == WM_KEYDOWN) =}Yz[-I  
 { O<MO2U+^x  
  if(pMsg -> wParam == VK_ESCAPE) Y<_;8%S  
   return TRUE; }:!X@C~  
  if(pMsg -> wParam == VK_RETURN) drbim8 !q~  
   return TRUE; eAjsMED  
 } /E:BEm!  
 return CDialog::PreTranslateMessage(pMsg); fT YlIT9  
} bas1(/|S  
vdot .  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) g|tclBx  
{ *n6L3"cO  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ~_ wSB[z  
  SaveBmp(); B#3Q4c$  
  return FALSE; HumL(S'm  
} 7"OJ,Mx%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ xl@~K^c]  
 CMenu pop; bL5u;iy)  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); '($$-P\/  
 CMenu*pMenu=pop.GetSubMenu(0); *JZlG%z  
 pMenu->SetDefaultItem(ID_EXITICON); vx}BT H  
 CPoint pt; |OuIQhoE  
 GetCursorPos(&pt); _ER. AKY  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); `A-  
 if(id==ID_EXITICON) JoD@e[(  
  DeleteIcon(); [$#G|>x  
 else if(id==ID_EXIT) u-QHV1H`(  
  OnCancel(); 6MLjU1  
 return FALSE; OP\L  
} $oPc,zS-gL  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ,wngS=  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) )jh~jU?c@  
 AddIcon(); e\!Aoky  
 return res; :#D~j]pP  
} Kq(JHB+  
*;U<b  
void CCaptureDlg::AddIcon() 4[)tO-v:Y  
{ Vlge*4q  
 NOTIFYICONDATA data; Z*=$n_ G  
 data.cbSize=sizeof(NOTIFYICONDATA); l(\F2_,2W  
 CString tip; ?-tNRIPW@p  
 tip.LoadString(IDS_ICONTIP); D  ,[yx='  
 data.hIcon=GetIcon(0); /QQjb4S}  
 data.hWnd=GetSafeHwnd(); R iFUa $  
 strcpy(data.szTip,tip); s'bTP(wl9  
 data.uCallbackMessage=IDM_SHELL; ,5AEtoF  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; -aV( 6i*n  
 data.uID=98; Q 9E.AN  
 Shell_NotifyIcon(NIM_ADD,&data); &y7xL-xP  
 ShowWindow(SW_HIDE); {d.K)8\  
 bTray=TRUE; ls~9qkAyLx  
} ^F&j;8U  
e0j4t-lL  
void CCaptureDlg::DeleteIcon() whm| "}x)u  
{ '*Ld,`  
 NOTIFYICONDATA data; }$ Kd-cj+  
 data.cbSize=sizeof(NOTIFYICONDATA); CTxP3a9]  
 data.hWnd=GetSafeHwnd(); {qOqtkj  
 data.uID=98; CyXaHO  
 Shell_NotifyIcon(NIM_DELETE,&data); }Yc5U,A;  
 ShowWindow(SW_SHOW); |kTq &^$  
 SetForegroundWindow(); WBb*2  
 ShowWindow(SW_SHOWNORMAL); !Uv>>MCr  
 bTray=FALSE; /y6I I$AvM  
} f .$*9Fkw  
ZB} A^X  
void CCaptureDlg::OnChange() Ijk hV  
{ 12;YxW>[  
 RegisterHotkey(); )uMv]  
} d8U<V<H<  
wvxsn!Ao&=  
BOOL CCaptureDlg::RegisterHotkey() {R_ <m$  
{ {'z$5<|  
 UpdateData(); A(n#k&W1fZ  
 UCHAR mask=0; 0Ue~dVrM(?  
 UCHAR key=0; s+z5"3'n  
 if(m_bControl) \jmZ t*c  
  mask|=4; eN\+  
 if(m_bAlt) NEvNj  
  mask|=2; MSRk|0Mcr  
 if(m_bShift) i0zrXaKV  
  mask|=1; $PAAmaigi  
  key=Key_Table[m_Key.GetCurSel()]; !Ce!D0Tx  
 if(bRegistered){ .2s^8gO  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); *2rc Y  
  bRegistered=FALSE; tGzp= PyA  
 } ayQeT  
 cMask=mask; drk BW}_  
 cKey=key; Od:-fw  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); B^/k`h6J  
 return bRegistered; o\; hF3   
} U<E]c 4*  
d={o|Mf  
  四、小结 YBR)S_C$_  
f1;@a>X  
  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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