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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: |>A1J:  
  @*q\$Eg}2  
  一、实现方法 Zx55mSfx:  
8S@ ~^D  
  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: @+ Berb  
Otn,(j;u  
#pragma data_seg("shareddata") k^]+I% ?Q  
HHOOK hHook =NULL; //钩子句柄 Fmt5"3B  
UINT nHookCount =0; //挂接的程序数目 \@['V   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 @p|[7'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 l8GziM{lp  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey \?GUGs  
static int KeyCount =0; T!pWU*aB  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 A]BG*  
#pragma data_seg() . ~G>vVb  
Zj~tUCc  
  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。 zEF3B  
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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: 6VQ*z8wLw  
=35EG{W(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR #TZYe4#f  
cKey,UCHAR cMask) z.]t_`KuF9  
{ HG=!#-$9  
 BOOL bAdded=FALSE; VV?+q)  
 for(int index=0;index<MAX_KEY;index++){ ;{q7rsE  
  if(hCallWnd[index]==0){ C n\'sb{  
   hCallWnd[index]=hWnd; mV`Z]-$$i  
   HotKey[index]=cKey; # u^FB  
   HotKeyMask[index]=cMask; *ta|,  
   bAdded=TRUE; sTeL4g|%{  
   KeyCount++; cm-cwPAh  
   break; \[]36|$LS  
  } :8E(pq|1PB  
 } 5U3="L  
 return bAdded; Bu>srX9f  
} #?!)-Q%  
//删除热键 vj[ .`fY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $62ospR^Y  
{ 9j:?s;B  
 BOOL bRemoved=FALSE; He)v:AH  
 for(int index=0;index<MAX_KEY;index++){ bX|Z||img  
  if(hCallWnd[index]==hWnd){ ~e~4S~{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ D>?%p"e  
    hCallWnd[index]=NULL; lp!@uoN^T  
    HotKey[index]=0; D D"]as"#  
    HotKeyMask[index]=0; <z%zz c1s  
    bRemoved=TRUE; "p#mNc  
    KeyCount--; hKQT,  
    break; Z)62/`C)  
   } C% }FVO\c  
  } 2Ev~[Hb.  
 } lY.FmF}k  
 return bRemoved; mZ7.#R*}  
} lmj73OB3  
d@7 ]=P:  
WkXa%OZ  
  DLL中的钩子函数如下: 2P!Pbl<  
s7(mNpo  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) R\A5f\L9  
{ iW-w?!>|m  
 BOOL bProcessed=FALSE; 2[r#y1ro  
 if(HC_ACTION==nCode) k U*\Fa*E  
 { 1W$@ V!  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 8!b#ez   
   switch(wParam) 8g(%6 ET  
   {  d01bt$8>  
    case VK_MENU: 4@/[aFH  
     MaskBits&=~ALTBIT; t$]lK6  
     break; |M)'@s:  
    case VK_CONTROL: BtVuI5*h  
     MaskBits&=~CTRLBIT; 5mnIQ~psR  
     break; E2LpQNvN%g  
    case VK_SHIFT: <[8at6;  
     MaskBits&=~SHIFTBIT; jGb+bN5U7  
     break; qI^6}PB  
    default: //judge the key and send message 3"6lPUS  
     break; X*]uLgbl  
   } ,Tvk&<!0  
   for(int index=0;index<MAX_KEY;index++){ "sUL"i  
    if(hCallWnd[index]==NULL) w%S\)wjS  
     continue; [,8@oM#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >y(;k|-$  
    { zp!{u{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); v'`C16&^]  
     bProcessed=TRUE; ou6yi; l%  
    } b5No>U) /  
   } pu0IhDMn  
  } 3-lJ]7OT  
  else if((lParam&0xc000ffff)==1){ //有键按下 S'9T>&<Kn  
   switch(wParam) //3iai  
   { FU;Tv).  
    case VK_MENU: wta\C{{  
     MaskBits|=ALTBIT; ? Z.p.v  
     break; aVNRhnM  
    case VK_CONTROL: *q=pv8&*s  
     MaskBits|=CTRLBIT; |k^'}n  
     break; =v:vc~G6  
    case VK_SHIFT: ht (RX  
     MaskBits|=SHIFTBIT; *_!nil3(i  
     break; pTprU)sa7  
    default: //judge the key and send message [_G_Wl'#8  
     break; pBL,kqYNA>  
   } -ce N}Cb3  
   for(int index=0;index<MAX_KEY;index++){ .Quu_S_ vH  
    if(hCallWnd[index]==NULL) i,8h B(M!  
     continue; ;8'hvc3i$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B~D{p t3y  
    { /[q6"R!uMz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); z{]$WVs:^  
     bProcessed=TRUE; CJ8XKy  
    } =$X5O&E3'  
   } lr=? &>MXj  
  } iyB02\d  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 x{*g^f  
   for(int index=0;index<MAX_KEY;index++){ /a [i:Oa#  
    if(hCallWnd[index]==NULL) 2RFYnDN  
     continue; A0m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :rk=(=@8`  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); fIN F;TK  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 )M<"YI)g  
   } g j8rrd |  
  } Q })x4  
 } IlVz 5#R  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !TA6-]1  
} (+`pEDD{X  
%YkJ A:  
  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: {pH{SRM)B  
/x c<&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); oM G8?p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R9A8)dDz  
]i(tou-[i  
  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: '- oS=OrZ  
:.e`w#$7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) N7Kq$G2O  
{ 9]<p  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) i,r O3J n  
 { z#ab V1 Xi  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 P"Lk(gY  
  SaveBmp(); wzVx16Rvc  
  return FALSE; {Fs}8\z  
 } Bi;D d?.  
 …… //其它处理及默认处理 t~H'Ugv^  
} j]U sb_7  
29("gB  
tJ>%Xop  
  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。  J -tOO  
K1>X%f^  
  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。 dw#K!,g  
'3TwrY?-  
  二、编程步骤 +;^Ux W  
{; #u~e(W  
  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"; i8iv{e2  
-sO[,  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 4Vl_vTz{i  
cyrVz4_a  
  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; *`2.WF@E)  
BmR++?L  
  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; $mdmuUIy-3  
1N6.r:wg)%  
  5、 添加代码,编译运行程序。 q.0Evr:  
YXz*B5R  
三、程序代码 f++MH]I;  
5&?[ Vt  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL kt`_n+G  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) `EKmp|B_p_  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ B7 PkCS&X  
#if _MSC_VER > 1000 gZA[Sq  
#pragma once 1(%9)).K  
#endif // _MSC_VER > 1000 G>Fk )  
#ifndef __AFXWIN_H__ T8<pb^#  
#error include 'stdafx.h' before including this file for PCH f@S n1c,Mk  
#endif YnM&t ;TX  
#include "resource.h" // main symbols (-S<9u-r  
class CHookApp : public CWinApp & -r^Q  
{ LLyw9y1  
 public: -55[3=#  
  CHookApp(); )/HbmtXqI  
  // Overrides d*qb^C{'"  
  // ClassWizard generated virtual function overrides -R %T Dx  
  //{{AFX_VIRTUAL(CHookApp) a ?D]]0%  
 public: YcQ$nZAU  
  virtual BOOL InitInstance(); &T.d"i  
  virtual int ExitInstance(); {!RDb'Zp  
  //}}AFX_VIRTUAL ~6{iQZa1Y  
  //{{AFX_MSG(CHookApp) ')R+Z/hG.  
  // NOTE - the ClassWizard will add and remove member functions here. Z9 z!YaOL  
  // DO NOT EDIT what you see in these blocks of generated code ! BF^dNgn+%K  
  //}}AFX_MSG 5(wmy-x\  
  DECLARE_MESSAGE_MAP() $4>(}  
}; JJ:pA_uX  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); EdL2t``  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *y+N-uq  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m^k$Z0  
BOOL InitHotkey(); v~8Cp C  
BOOL UnInit(); * 'eE[/K  
#endif 5!QT }Um  
[T |P|\M  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. J\@|c.ws  
#include "stdafx.h" m+UWvUB)  
#include "hook.h" P"(VRc6x  
#include <windowsx.h> }VU^ 8D  
#ifdef _DEBUG BGd# \2  
#define new DEBUG_NEW }_/]f!]  
#undef THIS_FILE HNJR&U t  
static char THIS_FILE[] = __FILE__; kzE<Y  
#endif Ln'y 3~@  
#define MAX_KEY 100 i)iK0g"2  
#define CTRLBIT 0x04 >&DC[)28  
#define ALTBIT 0x02 }/w]+f*  
#define SHIFTBIT 0x01 dhX$b!DA  
#pragma data_seg("shareddata") vjL +fH<0:  
HHOOK hHook =NULL; LR "=(  
UINT nHookCount =0; A"e4w?  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 0BwxPD#6bv  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ;J@U){R  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 4U8N7  
static int KeyCount =0; +v2)'?BS  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift _/czH<   
#pragma data_seg() r6eZ-V`4  
HINSTANCE hins; +CVB[r#hu  
void VerifyWindow(); upLjkQ)_  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 6b7c9n Z  
//{{AFX_MSG_MAP(CHookApp) Jc7}z:UB  
// NOTE - the ClassWizard will add and remove mapping macros here. *rgF[ :  
// DO NOT EDIT what you see in these blocks of generated code! F pT$D  
//}}AFX_MSG_MAP =@nE:uto]  
END_MESSAGE_MAP() Vx}e,(i  
k|czQ"vaI  
CHookApp::CHookApp() R XCjYzt  
{ QuP)j1"X  
 // TODO: add construction code here, abAw#XQ8  
 // Place all significant initialization in InitInstance ~?4 BP%g-y  
} ]K3bDU~  
n0LNAhM  
CHookApp theApp;  y!dw{Lz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) W}y)vrL  
{ `W>Sss  
 BOOL bProcessed=FALSE; (wFoI}s  
 if(HC_ACTION==nCode) ^AShy`o^X  
 { ymp ik.'  
  if((lParam&0xc0000000)==0xc0000000){// Key up <-mhz`^  
   switch(wParam) ]%ewxF  
   { VP~(;H5%  
    case VK_MENU: k*u6'IKi.4  
     MaskBits&=~ALTBIT; [7Q%c!e$*  
     break; z9:yt5ar  
    case VK_CONTROL: qqJghV$Oj  
     MaskBits&=~CTRLBIT; r7sA;Y\  
     break; 0~EGrEt  
    case VK_SHIFT: t-5K dLB  
     MaskBits&=~SHIFTBIT; S[gACEZ =  
     break; @eZBwFe  
    default: //judge the key and send message x#5vdBf  
     break; n=PfV3B  
   } : h(Z\D_  
   for(int index=0;index<MAX_KEY;index++){ ::+;PRy_E  
    if(hCallWnd[index]==NULL) '=O1n H<  
     continue; C0K: ffv;<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $hHV Ie]+  
    { -$kIVh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3A{)C_1a  
     bProcessed=TRUE; ,  O/IY  
    } h1"|$  
   } Ch3MwM5]  
  } ;X a N  
  else if((lParam&0xc000ffff)==1){ //Key down |AacV  
   switch(wParam) .P`QCH;Ih  
   { REgM  
    case VK_MENU: qp)Wt6 k?  
     MaskBits|=ALTBIT; SB08-G2  
     break; Be6+YM5Cl  
    case VK_CONTROL: P;@j  
     MaskBits|=CTRLBIT; 6-uLK'E  
     break; $+f=l~/s  
    case VK_SHIFT: t,dm3+R  
     MaskBits|=SHIFTBIT; zfE8=d8U  
     break; w[\rS`J  
    default: //judge the key and send message %LzARTX  
     break; AC'_#nPL#  
   } *Ti"8^`6  
   for(int index=0;index<MAX_KEY;index++) G&Dl($  
   { n-xdyJD  
    if(hCallWnd[index]==NULL) SASLeGaV  
     continue; e8T"d%f?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qrp@   
    { gC7Po  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,~&HL7 v  
     bProcessed=TRUE; UgK c2~  
    } 2IE\O 8b  
   } YvcV801Go  
  } x{8h3.ZQ,  
  if(!bProcessed){ 0M roHFh9`  
   for(int index=0;index<MAX_KEY;index++){ uoOUgNwGg  
    if(hCallWnd[index]==NULL) ^e <E/j{~  
     continue; Vs{\ YfF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) s3nO"~tM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;Vc|3  
   } In?#?:Q@&  
  } pqb`g@  
 } |,5|ZpgL  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $H[q5(_~  
} 5O d]rE  
-aVC`  
BOOL InitHotkey() ZZZ9C#hK^9  
{ b=xn(HE8|  
 if(hHook!=NULL){ $ ,]U~7S  
  nHookCount++; ~Gz9pBv1  
  return TRUE; e3W~6P  
 } &Jb\}c}  
 else dr}PjwW%  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); PZJ9f8 V  
  if(hHook!=NULL) IQ_s]b;z  
   nHookCount++; c AO:fb7  
  return (hHook!=NULL); $-Ex g*i  
} }zf!mlk  
BOOL UnInit() &mmaoWR  
{ <$zhNu~  
 if(nHookCount>1){ M2|h.+[Q  
  nHookCount--; E/a2b(,Tg  
  return TRUE; pc0{  
 } Y1I)w^}:  
 BOOL unhooked = UnhookWindowsHookEx(hHook); A]'jsv!+  
 if(unhooked==TRUE){ ,!@MLn  
  nHookCount=0; &Q;sbI}  
  hHook=NULL; $C5*@`GM$  
 } 2vLun   
 return unhooked; 72"H#dy%U  
} ;h+~xxu=X  
[RN]?,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5|*`} ;/y  
{ N'9T*&o+  
 BOOL bAdded=FALSE; z8awND  
 for(int index=0;index<MAX_KEY;index++){ <\<o#Vq  
  if(hCallWnd[index]==0){ C$PS@4'U  
   hCallWnd[index]=hWnd; 'UWkJ2:!  
   HotKey[index]=cKey; RU4X#gP4Vh  
   HotKeyMask[index]=cMask; (@5`beEd  
   bAdded=TRUE; (^y"'B  
   KeyCount++; OVDuF&0  
   break; oV0 45G  
  } 6(d6Uwc`  
 } < A8>To<  
 return bAdded; 6V]m0{:E  
} :,aY|2si  
Sk>=C0f:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !pw )sO~  
{ 7]zZdqG&p`  
 BOOL bRemoved=FALSE; {~&Q"8 }G  
 for(int index=0;index<MAX_KEY;index++){ {~F|"v  
  if(hCallWnd[index]==hWnd){ HrvyI)4{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ CAC4A   
    hCallWnd[index]=NULL; cI\[)5&  
    HotKey[index]=0; 8I/3T  
    HotKeyMask[index]=0; m","m  
    bRemoved=TRUE; wCNn/%C  
    KeyCount--; r5S/lp+Y+N  
    break; mLZ1u\ 7W  
   } pN5kcvQ  
  } ,GYQ,9:  
 } i83~&Q=  
 return bRemoved; sV a0eGc  
} z80P5^9  
* &:_Vgu  
void VerifyWindow() b/:wpy+9Z  
{ U_5`  
 for(int i=0;i<MAX_KEY;i++){ {+WY,%e  
  if(hCallWnd!=NULL){ Mww^  
   if(!IsWindow(hCallWnd)){ n>q!m@ }<  
    hCallWnd=NULL; -9t"$)&  
    HotKey=0; _P qq*  
    HotKeyMask=0; 1$vGQ  
    KeyCount--; 6(`N!]e*L  
   } nTr%S&<+"  
  } JpfA+r  
 } F*PhV|XU  
} Deh3Dtg/k  
kPs?  
BOOL CHookApp::InitInstance() B~Kx Up  
{ ZDFq=)0C  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); "frZ%mv  
 hins=AfxGetInstanceHandle(); 0AQ4:KV(Y  
 InitHotkey(); f $Agcy  
 return CWinApp::InitInstance(); sq_>^z3T  
} 1PwtzH .w  
R xITMt  
int CHookApp::ExitInstance() cRnDAn#42  
{ Dz~0(  
 VerifyWindow(); LBy`N_@  
 UnInit(); ES+ CAwqf  
 return CWinApp::ExitInstance(); 7@;*e=v  
} 03fOm  
gt}Atr6>_  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file `}),wBq  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) HqWWWCWal  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ S!8<|WO^t  
#if _MSC_VER > 1000 hH1Q:}a  
#pragma once k _V+;&:%  
#endif // _MSC_VER > 1000 J -z.  
@GKDSS4jv  
class CCaptureDlg : public CDialog lubsLI  
{ ;O hQBAC  
 // Construction |D)CAQn,  
 public: _R\FB|_  
  BOOL bTray; 7T)y"PZ  
  BOOL bRegistered; n{4iW_/D  
  BOOL RegisterHotkey(); QlGK+I>y;  
  UCHAR cKey; 6-wpR  
  UCHAR cMask; W8g13oAu"  
  void DeleteIcon(); SSF:PTeG>  
  void AddIcon(); Eg`~mE+a  
  UINT nCount; ~%*l>GkP*  
  void SaveBmp(); )jL@GW  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor P;I,f  
  // Dialog Data bDvGFSAH  
  //{{AFX_DATA(CCaptureDlg) E^rBs2;9  
  enum { IDD = IDD_CAPTURE_DIALOG }; W@AHE?s6g  
  CComboBox m_Key; Hj >fg2/  
  BOOL m_bControl; DIGw4g4Kt  
  BOOL m_bAlt;  GhfhR^P  
  BOOL m_bShift; 6h/!,j0:t_  
  CString m_Path; Lmjd,t  
  CString m_Number; C,W@C  
  //}}AFX_DATA Jzf+"%lv  
  // ClassWizard generated virtual function overrides ']2Vf] dB  
  //{{AFX_VIRTUAL(CCaptureDlg) p_Xfj2E4c  
 public: X{#^O/  
  virtual BOOL PreTranslateMessage(MSG* pMsg); HCOsVTl,  
 protected: 9q?knMt  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support bq7+l4CGTv  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); |iJz[%  
  //}}AFX_VIRTUAL v>K|hH  
  // Implementation qE2<vjRg  
 protected: 3)VO{Cj!  
  HICON m_hIcon;  $Z &6  
  // Generated message map functions Q3ZGN1aX<  
  //{{AFX_MSG(CCaptureDlg) TgV-U  
  virtual BOOL OnInitDialog(); A(&\wd  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); T+XcEI6w  
  afx_msg void OnPaint(); MMa`}wSs  
  afx_msg HCURSOR OnQueryDragIcon(); ;L87 %P(.  
  virtual void OnCancel(); 9*iVv)jd  
  afx_msg void OnAbout(); bzpi7LKN  
  afx_msg void OnBrowse(); *><j(uz!  
  afx_msg void OnChange(); =z5=?  
 //}}AFX_MSG Pq~#SxA~  
 DECLARE_MESSAGE_MAP() o7we'1(O  
}; C|H`.|Q  
#endif ?z)2\D  
R5MN;xG^  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file uu4! e{K  
#include "stdafx.h" <2j$P Y9  
#include "Capture.h" 8u[.s`^  
#include "CaptureDlg.h" b^[>\s'  
#include <windowsx.h> ~xam ;]2  
#pragma comment(lib,"hook.lib") uF%N`e^S  
#ifdef _DEBUG Fc=F2Mo?  
#define new DEBUG_NEW M&zB&Ia"'  
#undef THIS_FILE jY9tq[~/  
static char THIS_FILE[] = __FILE__; &VjPdu57  
#endif 0*^f EoV  
#define IDM_SHELL WM_USER+1 x2~fc  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9[{q5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); MAqETjB  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; L) _ VdB  
class CAboutDlg : public CDialog Y,n8co^  
{ ZWFOC,)b  
 public: VKXB)-'L  
  CAboutDlg();  r+]a  
  // Dialog Data z,qNuv"W  
  //{{AFX_DATA(CAboutDlg) bMqS:+  
  enum { IDD = IDD_ABOUTBOX }; 2Sy:wt  
  //}}AFX_DATA R$/q=*k  
  // ClassWizard generated virtual function overrides |%Y=]@f  
  //{{AFX_VIRTUAL(CAboutDlg) <+ <o X"I  
 protected: yh4%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support UBwYwm0  
  //}}AFX_VIRTUAL Pw Amnk !  
  // Implementation zS\m8[+]  
 protected: }q/[\3  
  //{{AFX_MSG(CAboutDlg) CZv^,O(M?2  
  //}}AFX_MSG 9zehwl]~  
  DECLARE_MESSAGE_MAP() kvN6K6  
}; IgF#f%|Q  
a- /p/ I-%  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ||Wg'$3  
{ n<[H!4  
 //{{AFX_DATA_INIT(CAboutDlg) ciPaCrV  
 //}}AFX_DATA_INIT MIv,$  
} |R Qa.^.  
SkXx: @  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) JZNvuPD   
{ BI6`@}%7>  
 CDialog::DoDataExchange(pDX); oA ]F`N=  
 //{{AFX_DATA_MAP(CAboutDlg) ?7*J4.  
 //}}AFX_DATA_MAP `MMZR=LA  
} TP/bPZY  
"k7C   
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 52Q~` t7F  
 //{{AFX_MSG_MAP(CAboutDlg) k:E+]5  
 // No message handlers FwSV \N+#'  
 //}}AFX_MSG_MAP qB=%8$J  
END_MESSAGE_MAP() $5yH8JU  
k$K>ml/h  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) CY.i0  
: CDialog(CCaptureDlg::IDD, pParent) )RwO2H  
{ K}Pi"Le@W  
 //{{AFX_DATA_INIT(CCaptureDlg) T+<OlXpL  
  m_bControl = FALSE; /\uW[mt  
  m_bAlt = FALSE; o7 X5{  
  m_bShift = FALSE; T ;JA.=I  
  m_Path = _T("c:\\"); :j!N7c{  
  m_Number = _T("0 picture captured."); "/U~j4O  
  nCount=0; k'Z$#  
  bRegistered=FALSE;  *}`D2_uP  
  bTray=FALSE; X6c['Zrc  
 //}}AFX_DATA_INIT 'WQ<|(:{  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 5-X(K 'Q  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); )SFy Q  
} * d[sja+  
Q" an6ht|  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 5oI gxy  
{ 9 l9|w4YJs  
 CDialog::DoDataExchange(pDX); Ni 5Su  
 //{{AFX_DATA_MAP(CCaptureDlg) j*)K> \  
  DDX_Control(pDX, IDC_KEY, m_Key); S~LT Lv:>  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); dy*CDRU4  
  DDX_Check(pDX, IDC_ALT, m_bAlt); rN^P//  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); !NFP=m1  
  DDX_Text(pDX, IDC_PATH, m_Path); 6*H F`@(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); s\dF7/b  
 //}}AFX_DATA_MAP J~vK`+Zs  
} u0& dDZ  
WH^r M`9  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) L>EC^2\  
//{{AFX_MSG_MAP(CCaptureDlg) SLG3u;Ab  
 ON_WM_SYSCOMMAND() l6EDl0~r  
 ON_WM_PAINT() T&`H )o  
 ON_WM_QUERYDRAGICON() C6C7*ks  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) q9&d24|  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) M%8:  
 ON_BN_CLICKED(ID_CHANGE, OnChange) lE?F Wt  
//}}AFX_MSG_MAP 7 n=fB#!*3  
END_MESSAGE_MAP() U0:tE>3`  
M(2c{TT  
BOOL CCaptureDlg::OnInitDialog() {~ngI<  
{ %r*zd0*<n1  
 CDialog::OnInitDialog(); }~RH!Q1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); :!f1|h  
 ASSERT(IDM_ABOUTBOX < 0xF000); 'nM)=  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 85fBKpEe  
 if (pSysMenu != NULL) x-_!I>l&  
 { T?+xx^wYk  
  CString strAboutMenu; y^oSVj  
  strAboutMenu.LoadString(IDS_ABOUTBOX); +FoR;v)z=F  
  if (!strAboutMenu.IsEmpty()) 0r+%5}|-K  
  { :hp=>^$Y  
   pSysMenu->AppendMenu(MF_SEPARATOR); WlnI`!)d  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;Vad| -  
  } N(]>(S o  
 } ;TK:D=p4  
 SetIcon(m_hIcon, TRUE); // Set big icon <o_H]c->  
 SetIcon(m_hIcon, FALSE); // Set small icon j_?U6$xi  
 m_Key.SetCurSel(0); uSs~P%@6|  
 RegisterHotkey(); 8yH) 8:w  
 CMenu* pMenu=GetSystemMenu(FALSE); (l.`g@(L  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);  [;D4,@A  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); CW Y'q  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 7K`A2  
 return TRUE; // return TRUE unless you set the focus to a control 1_7}B4  
} 1(Kd/%]{  
pbivddi2  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) IiACr@[?e  
{ w$7*za2  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) \HDRr*KO  
 { 6P' m0  
  CAboutDlg dlgAbout; !V.'~xj  
  dlgAbout.DoModal(); 6ZVJ2xs[%  
 } laqW {sX^5  
 else cT8jG ,+"}  
 { #`/KF_a3\>  
  CDialog::OnSysCommand(nID, lParam); [t /hjm"$  
 } :JSOj@s  
} c{j0A;XMS  
j]6j!.1  
void CCaptureDlg::OnPaint() X LPO_ tD  
{ Hq^sU%  
 if (IsIconic()) jd=k[Yqr  
 { a[)in ,3  
  CPaintDC dc(this); // device context for painting Tc@r#!.m  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); W\zg#5fmK  
  // Center icon in client rectangle  x9 <cT'  
  int cxIcon = GetSystemMetrics(SM_CXICON); 9S.Uo[YY  
  int cyIcon = GetSystemMetrics(SM_CYICON); |J2R w f  
  CRect rect; OGrVy=rd  
  GetClientRect(&rect); Ud:v3"1  
  int x = (rect.Width() - cxIcon + 1) / 2; (eN\s98)/  
  int y = (rect.Height() - cyIcon + 1) / 2; F`U%xn,  
  // Draw the icon ,'F;s:WM,  
  dc.DrawIcon(x, y, m_hIcon); *:3flJt  
 } GLt#]I"LY  
 else _5.^A&Y*  
 { a>Uk<#>2?a  
  CDialog::OnPaint(); j|KZ HH%dc  
 } r<Ll>R  
} ju(&v*KA  
VLN=9  
HCURSOR CCaptureDlg::OnQueryDragIcon() CfoSow-  
{ DTt/nmKAqJ  
 return (HCURSOR) m_hIcon; v'S}&zmF]  
} Z= dEk`  
<Jo_f&&{  
void CCaptureDlg::OnCancel() FlRbGg^  
{ )wo'i]#2:  
 if(bTray) g ` 6Xrf  
  DeleteIcon(); a{QHv0goG  
  CDialog::OnCancel(); 8k]'P*9ulz  
}  ]k_@F6 A  
vN-#Ej. u  
void CCaptureDlg::OnAbout() m]+g[L?-  
{ s$:F^sxb  
 CAboutDlg dlg;  "C B*  
 dlg.DoModal(); A /,7%bB1  
} ^vLHs=<  
s9PD[u/y  
void CCaptureDlg::OnBrowse() A jr]&H4  
{ KO<Yc`Fs  
 CString str; 3lqR(Hh3  
 BROWSEINFO bi; v-3In\T=^  
 char name[MAX_PATH]; 4WG~7eIgy  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 5*{U!${a  
 bi.hwndOwner=GetSafeHwnd(); [2gK^o&t  
 bi.pszDisplayName=name; 3aQWzEnh  
 bi.lpszTitle="Select folder"; G\?fWqx  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; RRqHo~*0  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 3<1Uq3Pa  
 if(idl==NULL) ^<'5 V)  
  return; + O=wKsGD  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); #Sr_PEo _  
 str.ReleaseBuffer(); iv2did4  
 m_Path=str; h!?7I=p~#  
 if(str.GetAt(str.GetLength()-1)!='\\') y5 $h  
  m_Path+="\\"; \C5YVl#  
 UpdateData(FALSE); X#j-Ld{j  
} hW$B;  
DnS# cs~  
void CCaptureDlg::SaveBmp() &*B=5W;6^u  
{ XMd-r8yYr  
 CDC dc; %|}obiV)  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); "~0m_brf  
 CBitmap bm; qvy~b  
 int Width=GetSystemMetrics(SM_CXSCREEN); ~0,Utqy  
 int Height=GetSystemMetrics(SM_CYSCREEN); 1T a48  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 9}Ud'#E  
 CDC tdc; CvKXVhf0$J  
 tdc.CreateCompatibleDC(&dc); "rOe J~4 X  
 CBitmap*pOld=tdc.SelectObject(&bm); ,4zwd@&O  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 9"Oz-!Y4  
 tdc.SelectObject(pOld); l5F>v!NA  
 BITMAP btm;  h%0/j  
 bm.GetBitmap(&btm); "Kx2k>ym  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; jFY6}WY)}7  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); q(4W /y  
 BITMAPINFOHEADER bih; \Y&*sfQ  
 bih.biBitCount=btm.bmBitsPixel; G=W!$(:  
 bih.biClrImportant=0; 0OO$(R*  
 bih.biClrUsed=0; mr dG- t(k  
 bih.biCompression=0; r|wB& PGW  
 bih.biHeight=btm.bmHeight; y|f`sBMM  
 bih.biPlanes=1; \>0%E{CR  
 bih.biSize=sizeof(BITMAPINFOHEADER); T+ey>[  
 bih.biSizeImage=size; WPi^;c8  
 bih.biWidth=btm.bmWidth; 7\m.xWX e  
 bih.biXPelsPerMeter=0; V#["Z}  
 bih.biYPelsPerMeter=0; MG)wVS<d_  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); GxE"q-G  
 static int filecount=0; @FVan  
 CString name; NSH20$A<  
 name.Format("pict%04d.bmp",filecount++); ~L$B]\/A5  
 name=m_Path+name; S`HshYlE q  
 BITMAPFILEHEADER bfh; Y [Jt+p]  
 bfh.bfReserved1=bfh.bfReserved2=0; 5$Lo]H*  
 bfh.bfType=((WORD)('M'<< 8)|'B'); q$FwO"dC  
 bfh.bfSize=54+size; D-\WS^#  
 bfh.bfOffBits=54; "S#4  
 CFile bf; "D0:Y(\  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ CA%p^4Q  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); !T;*F%G9  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); XOgl> 1O  
  bf.WriteHuge(lpData,size); 7KIOI,qb6  
  bf.Close(); VeK^hz R^Z  
  nCount++; #v!(uuq,  
 } d'ddxT$GG  
 GlobalFreePtr(lpData); <tkxE!xF`J  
 if(nCount==1) v,t;!u,40  
  m_Number.Format("%d picture captured.",nCount); 59K%bz5t  
 else b<,Z^Z_  
  m_Number.Format("%d pictures captured.",nCount); _/;k ;$gDp  
  UpdateData(FALSE); Q79& Q04XN  
} 5sJi- ^  
Hik8u!#P  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Q` mw2$zv  
{ l%"[857  
 if(pMsg -> message == WM_KEYDOWN) |O0=Q,<m  
 { !z@QoD  
  if(pMsg -> wParam == VK_ESCAPE) 'Gwa[ |6i  
   return TRUE; |Y' xtOMX  
  if(pMsg -> wParam == VK_RETURN) )o!y7MTl  
   return TRUE; |jB]5ciT  
 } "0x"X w#I  
 return CDialog::PreTranslateMessage(pMsg); `:WVp~fn  
} 9>~UqP9  
W\09h Z6  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +zodkB~)  
{ VYw vT0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ZUGuV@&-T  
  SaveBmp(); GE4d=;5  
  return FALSE; p x;X}Cd  
} nLK%5C  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ WBTdQG Q6  
 CMenu pop; -:9E+b  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ~doOt  
 CMenu*pMenu=pop.GetSubMenu(0); b_ 88o-*/  
 pMenu->SetDefaultItem(ID_EXITICON); &.k'Dj2hf  
 CPoint pt; TTjj.fq6  
 GetCursorPos(&pt); 9( ;lcOz  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); PMr {BS  
 if(id==ID_EXITICON) `_{'qqRhe  
  DeleteIcon(); x Lht6%o*  
 else if(id==ID_EXIT) .<JD'%?"  
  OnCancel(); }9T$XF~  
 return FALSE; ) *:<3g!  
} xR5jy|2JJ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); rg U$&O  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) KA:>7-  
 AddIcon(); 9k.LV/Y  
 return res; x#yL&+'?Mj  
} 9TGjcZ1S'  
':yE5j  
void CCaptureDlg::AddIcon() vPuPSE%M  
{ C:/ca)  
 NOTIFYICONDATA data; >O[# 661  
 data.cbSize=sizeof(NOTIFYICONDATA); 31mY]Jve"  
 CString tip; e#`wshtN:  
 tip.LoadString(IDS_ICONTIP); $?p^ m`t_  
 data.hIcon=GetIcon(0); +=I_3Wtth  
 data.hWnd=GetSafeHwnd(); ~X;r}l=k<  
 strcpy(data.szTip,tip); yBO88rfh>  
 data.uCallbackMessage=IDM_SHELL; q[]EVs0$ew  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Pz3jc|Ga  
 data.uID=98; Mj5=t:MI  
 Shell_NotifyIcon(NIM_ADD,&data); 2&fIF}vk>m  
 ShowWindow(SW_HIDE); 3$+|nP:U  
 bTray=TRUE; o?uTL>Zin  
} !]q wRB$5  
(_-<3)q4  
void CCaptureDlg::DeleteIcon()  !pl<  
{ xin<.)!E  
 NOTIFYICONDATA data; 4A0R07"  
 data.cbSize=sizeof(NOTIFYICONDATA); B&|F9Z6D  
 data.hWnd=GetSafeHwnd(); Dw    
 data.uID=98; `/ix[:}m^  
 Shell_NotifyIcon(NIM_DELETE,&data); dix\hqZ  
 ShowWindow(SW_SHOW); &O5%6Sv3d  
 SetForegroundWindow(); I"*g-ji0  
 ShowWindow(SW_SHOWNORMAL); ->&AJI0  
 bTray=FALSE; -?<wvUbR{  
} E,E:WuB  
csT_!sI I  
void CCaptureDlg::OnChange() KZeRbq2 jJ  
{ 20;M-Wx  
 RegisterHotkey(); iOm1U_S  
} a?E]-Zf  
qQ%zSJ?  
BOOL CCaptureDlg::RegisterHotkey() <||F$t  
{ #B:J7&@fn  
 UpdateData(); ?rXh x{vD  
 UCHAR mask=0; x_{ua0BLDf  
 UCHAR key=0; LlL\7?_;  
 if(m_bControl) eSoOJ[&$  
  mask|=4; |332G64K  
 if(m_bAlt) 1 9a"@WB@  
  mask|=2; z~+_sTu  
 if(m_bShift) ]oP2T:A  
  mask|=1; pm B}a7  
  key=Key_Table[m_Key.GetCurSel()]; zMt"ST.  
 if(bRegistered){ u].=b$wHHM  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); =PAvPj&}e  
  bRegistered=FALSE; |f'U_nE#R/  
 } `R0>;TdT  
 cMask=mask; =|S8.|r+  
 cKey=key; A,e/y  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); :+ @-F>Q  
 return bRegistered; 3lhXD_Y  
} *RUB`tEL  
o1MI&}r  
  四、小结 "2+>!G RQ  
NWNH)O@  
  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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