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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: Ha~g8R&  
  k$V.hG|6M  
  一、实现方法 fbbk;Rq.'3  
pg}9baW?  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: eBD7g-  
EDm,Y  
#pragma data_seg("shareddata") kEM5eY  
HHOOK hHook =NULL; //钩子句柄 ,j4 ;:F  
UINT nHookCount =0; //挂接的程序数目 /Z:\=0`  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 G/F0 )M  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 w$JG:y#  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey =H'7g 6  
static int KeyCount =0; yDt3)fP#  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 =6mnXpM.  
#pragma data_seg() I_Q*uH.Y5  
\O"EK~x}/  
  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。 `Gl@?9,i  
RH,1U3?  
  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,y(Fc~]g'  
")l_>y ?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR UB3b  
cKey,UCHAR cMask) $K)9(DD  
{ Az_s"}G  
 BOOL bAdded=FALSE; 3pSkk  
 for(int index=0;index<MAX_KEY;index++){ Q\H_lB  
  if(hCallWnd[index]==0){ {DPobyvwFk  
   hCallWnd[index]=hWnd; _,h hO  
   HotKey[index]=cKey; Wcy N, 5  
   HotKeyMask[index]=cMask; kfF.Ctr1a  
   bAdded=TRUE; t^h {D   
   KeyCount++; rPV\ F  
   break; [u_-x3`  
  } v3(W4G`  
 } bg\~"  
 return bAdded; *o8DfZ  
} 6Xjr0 C+  
//删除热键 Nz+Jf57t  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I("J$  
{ } k[gR I]  
 BOOL bRemoved=FALSE; qDqgU  
 for(int index=0;index<MAX_KEY;index++){ ^L&hwXAO:  
  if(hCallWnd[index]==hWnd){ Bc {#ia  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?#F}mOVAa  
    hCallWnd[index]=NULL; %N!2 _uk5  
    HotKey[index]=0; z6tH2Wxf  
    HotKeyMask[index]=0; `TBI{q[y  
    bRemoved=TRUE; Z8 \c'xN  
    KeyCount--; YuWsE4$  
    break; LTsG  
   } K0xZZ`  
  } kLKd O0  
 } ni#!Gxw  
 return bRemoved; z}'*zB>  
} hJ0)"OA5  
H26'8e  
lY5a=mwHU  
  DLL中的钩子函数如下: 66"-Xf~u  
v)(tB7&`=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >$]SYF29  
{ f#:7$:{F1  
 BOOL bProcessed=FALSE; gB!K{ Io'  
 if(HC_ACTION==nCode) m: 77pE&o  
 { @g*=xwve=~  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 f`X#1w9  
   switch(wParam) X0X!:gX  
   {  F=C8U$'S  
    case VK_MENU: Gc) Zu`67  
     MaskBits&=~ALTBIT; djVE x }  
     break; M2ig iR  
    case VK_CONTROL: i"uAT$xe  
     MaskBits&=~CTRLBIT; ;mV,r,\dH  
     break; W`fE@*k0  
    case VK_SHIFT: CB5 ~!nKv&  
     MaskBits&=~SHIFTBIT; K (yuL[p`  
     break; 0:^L>MO  
    default: //judge the key and send message $wa )e  
     break; K[ZgT$zZ  
   } f!}c0nb  
   for(int index=0;index<MAX_KEY;index++){ :%Dw3IrOM  
    if(hCallWnd[index]==NULL) ms'!E)  
     continue; C[$uf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v_*E:E  
    { ".z~c%'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); YX+Da"\  
     bProcessed=TRUE; /8baJ+D"4\  
    } S8+Xk= x  
   } CCJ!;d;&87  
  } /#?lG`'1  
  else if((lParam&0xc000ffff)==1){ //有键按下 QKYGeT7&Y'  
   switch(wParam) 9k_3=KS3N  
   { tk5Bb`a  
    case VK_MENU: h5 Y3 v  
     MaskBits|=ALTBIT; FAAqdK0  
     break; ~y{(&7sM  
    case VK_CONTROL: =R)9_D6I  
     MaskBits|=CTRLBIT; y 1fl=i  
     break; zV {[0s  
    case VK_SHIFT: X]q,A5g  
     MaskBits|=SHIFTBIT; apk06"/  
     break; NfcQB;0  
    default: //judge the key and send message MT" 2^&R  
     break; |2!/<%Yr`  
   } e.eQZ5n~q`  
   for(int index=0;index<MAX_KEY;index++){ .}.5|z} A  
    if(hCallWnd[index]==NULL) yKEE @@}\  
     continue; KYY~ YP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v7VJVLH,I7  
    { #;'1aT  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /ve8);cH\  
     bProcessed=TRUE; H"8+[.xBh  
    } kStWsc$;+T  
   } ANh5-8y  
  } >\b=bT@iM  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 =)C}u6  
   for(int index=0;index<MAX_KEY;index++){ ( q^umw  
    if(hCallWnd[index]==NULL) W`] ,  
     continue; XA{ tVh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) hQrO8T?2  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); K"1xtpy  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 5EDM?G  
   } &#Sg1$/+  
  } .L%_#A  
 } ^ MkT">  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6.|f iQs ]  
} vyT$IdV2  
$~4ZuV%  
  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: Nko;I?Fn  
8}m] XO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); GE=#8-@g~p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Y'kD_T`f,  
+ oyW_!(  
  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: D .| h0gU  
$H^hK0?'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) li\hHd5  
{ & v=2u,]T  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6sl*Ko[  
 { Vin d\yvM  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Bsw5A7,-  
  SaveBmp(); 94"R&|  
  return FALSE; $(_Xt-6  
 } BuI&kU,WY  
 …… //其它处理及默认处理 rWF~a ec  
} RLr;]j8cm  
:h1itn  
E,5jY  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 Y+ P\5G  
r: n^U#  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 6R5) &L  
]t]s/;9]K  
  二、编程步骤 S|Wv1H>  
j2 "j Cv  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; nm 66U4.@  
<pRb#G"  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; J\XYUs  
)DuOo83n["  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ws4a(1  
hRSRz5 J}  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; t#oJr2  
zzy%dc  
  5、 添加代码,编译运行程序。 3]0ETcT  
MTBN&4[  
三、程序代码 GEy^*, d  
9>d$a2 nc  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL g+p?J.+  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) dkJ+*L5  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ )El#Ks5u  
#if _MSC_VER > 1000 axnkuP(  
#pragma once 71nXROB  
#endif // _MSC_VER > 1000 XX~~SvSM  
#ifndef __AFXWIN_H__ Lm"l*j4  
#error include 'stdafx.h' before including this file for PCH %1a\"F![  
#endif hf>JW[>Xo  
#include "resource.h" // main symbols n_sCZ6uXEQ  
class CHookApp : public CWinApp w<N [K>  
{ mZJ"e,AY  
 public: hT9fqH  
  CHookApp(); fLAOA9  
  // Overrides JC}y{R8  
  // ClassWizard generated virtual function overrides jR\&2;T  
  //{{AFX_VIRTUAL(CHookApp) OOs Y{8xM  
 public: f$9V_j-K+  
  virtual BOOL InitInstance(); ?%(8RQ  
  virtual int ExitInstance(); +mE y7qM  
  //}}AFX_VIRTUAL OT{wqNI  
  //{{AFX_MSG(CHookApp) 4dv+RRpGOv  
  // NOTE - the ClassWizard will add and remove member functions here. HE. `  
  // DO NOT EDIT what you see in these blocks of generated code ! Gr&5 mniu  
  //}}AFX_MSG s2riayM9/  
  DECLARE_MESSAGE_MAP() #rqLuqw  
}; E"&fT!yi  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); !6\{q M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zn&NLsA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); B@G'6 ?  
BOOL InitHotkey(); bcC ;i~9  
BOOL UnInit(); `gfh]7T  
#endif & ,2XrXiFu  
6<.Ma7)lA  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. i[H`u,%+(  
#include "stdafx.h" [2~Et+r6g  
#include "hook.h" 8v\BW^z3  
#include <windowsx.h> _/MHi-]/.  
#ifdef _DEBUG 8-UlbO6  
#define new DEBUG_NEW PYPs64kNC]  
#undef THIS_FILE G+[hE|L~y  
static char THIS_FILE[] = __FILE__; Vq2d+ ,fb  
#endif E(*RtOC<W  
#define MAX_KEY 100 d%NO_=I.  
#define CTRLBIT 0x04 3i=+ [  
#define ALTBIT 0x02 fmY=SqQG-  
#define SHIFTBIT 0x01 m^@,0\F  
#pragma data_seg("shareddata") c?"#x-<1s  
HHOOK hHook =NULL; 5;oWFl  
UINT nHookCount =0; BV"7Wp;  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey +DaP XZ5.  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT xrxORtJ<  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey :o?On/  
static int KeyCount =0; IQf:aX  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift bEyZRG  
#pragma data_seg() &z8@  rk|  
HINSTANCE hins; ,]\L\ V  
void VerifyWindow(); &]3_ .C  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $(K[W}  
//{{AFX_MSG_MAP(CHookApp) puA~}6C  
// NOTE - the ClassWizard will add and remove mapping macros here. h7f&7v  
// DO NOT EDIT what you see in these blocks of generated code! b=horvs/!  
//}}AFX_MSG_MAP d4t %/Uh  
END_MESSAGE_MAP() }&Ngh4/  
;*5$xs&=_Z  
CHookApp::CHookApp() w,> ceu/  
{ xDG8C39qrs  
 // TODO: add construction code here, [U.3rcT"N  
 // Place all significant initialization in InitInstance zMxHJNQ\D  
} &eKnLGKD  
_so\h.lt  
CHookApp theApp; v8W.84e-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~cQ./G4  
{ FM$XMD0=  
 BOOL bProcessed=FALSE; x;dyF_*;  
 if(HC_ACTION==nCode) 2'Cwx-_G`  
 { .;)7)%  
  if((lParam&0xc0000000)==0xc0000000){// Key up Pky/fF7e  
   switch(wParam) RT HD2  
   { A^nB!veh  
    case VK_MENU: SB0Cq  
     MaskBits&=~ALTBIT; =7wI/5iN  
     break; CtJ*:wF  
    case VK_CONTROL: F=!p7msRB  
     MaskBits&=~CTRLBIT; rrbD0UzFA  
     break; |N/Grk4  
    case VK_SHIFT: WcqQR))n  
     MaskBits&=~SHIFTBIT; | s%--W  
     break; XUc(7>k  
    default: //judge the key and send message 0Am&:kX't  
     break; uP2e/a  
   } m1H_kJ  
   for(int index=0;index<MAX_KEY;index++){ b6Pi:!4  
    if(hCallWnd[index]==NULL) "c` $U]M%  
     continue; _ dEc? R}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W{:^P0l  
    { /I}#0}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); i#]}k  
     bProcessed=TRUE; PKFjM~J  
    } zrVw l\&  
   } ,r^zDlS<q  
  } R?Zv  
  else if((lParam&0xc000ffff)==1){ //Key down EK`}?>'  
   switch(wParam) KK$t3e)  
   { ZFwUau  
    case VK_MENU: uNSaw['0j  
     MaskBits|=ALTBIT;   @a2n{  
     break; "`HkAW4GZa  
    case VK_CONTROL: 4Bg"b/kF  
     MaskBits|=CTRLBIT; sh;DCd  
     break; _W]R|kYl$'  
    case VK_SHIFT: E#}OIZ\S  
     MaskBits|=SHIFTBIT; #0>??]&r  
     break; +9Q,[)e r  
    default: //judge the key and send message Wd "<u2  
     break; hS&3D6G t  
   } !*Ex}K99  
   for(int index=0;index<MAX_KEY;index++) E| eEAa  
   { Rr#Zcs!G  
    if(hCallWnd[index]==NULL) ZD!?mR+-  
     continue; q_iPWmf p*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X)7_@,7  
    { !2L?8oP-z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); N~NUBEKcp  
     bProcessed=TRUE; 9#(Nd, m})  
    } 1%Hc/N-  
   } jHjap:i`cI  
  } ayF+2(vch)  
  if(!bProcessed){ xb{G:v  
   for(int index=0;index<MAX_KEY;index++){ r+ v?~m!  
    if(hCallWnd[index]==NULL) 3 UUOB.  
     continue; (Y i 1U~{:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) DR]=\HQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >D]g:t@v  
   } D!7-(3R  
  } 6[+@#IWx  
 } @7S* ]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); qFQO1"mu  
} 0b=1Ce+0q  
3Ye{a<ckK  
BOOL InitHotkey() r~rftw  
{ ;::]R'F[  
 if(hHook!=NULL){ |m{u]9  
  nHookCount++; zm>^!j !  
  return TRUE; YoDL/  
 } g{ ()   
 else b5i ehoA  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); aF8'^xF  
  if(hHook!=NULL) xhcFZTj/(  
   nHookCount++; _43'W{%  
  return (hHook!=NULL); ^mwS6WH6  
} pW&K=,7|  
BOOL UnInit() Q Ev7k  
{ $'*q]]  
 if(nHookCount>1){ B^;"<2b*  
  nHookCount--; +/+>:  
  return TRUE; `:b*#@  
 } vJ,r}$H3  
 BOOL unhooked = UnhookWindowsHookEx(hHook); I<+EXH%1,  
 if(unhooked==TRUE){ t;HM  
  nHookCount=0; LNNwy:_ !  
  hHook=NULL; XXD LbT'J  
 } XrUc`  
 return unhooked; nh XVc((  
} bW-sTGjRD  
IL>VH`D  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Oa.84a  
{ UaCfXTG  
 BOOL bAdded=FALSE; ;_X2E~i[  
 for(int index=0;index<MAX_KEY;index++){ ?3 S{>+'  
  if(hCallWnd[index]==0){ /@w w"dmqU  
   hCallWnd[index]=hWnd; qdnwaJ;&  
   HotKey[index]=cKey; WAt= T3  
   HotKeyMask[index]=cMask; fI v?HD:j  
   bAdded=TRUE; V O\g"Yc  
   KeyCount++; {8* d{0l  
   break; (b;Kl1Ql]  
  } q6'Q-e)  
 } S=<OS2W7+r  
 return bAdded; G^|!'V  
} .H@b zm  
X5pb9zRq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "&:H }Jd  
{ 1/f{1k  
 BOOL bRemoved=FALSE; N7u|< 0[  
 for(int index=0;index<MAX_KEY;index++){ boq=@Qh  
  if(hCallWnd[index]==hWnd){ YK\pV'&+  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Xub*i^(]  
    hCallWnd[index]=NULL; jM}(?^@  
    HotKey[index]=0; _\.4ofK(  
    HotKeyMask[index]=0; !bCSt?}@u  
    bRemoved=TRUE; &,P; 7R  
    KeyCount--; Q=6 1.lP6  
    break; 5Gs>rq" #  
   } WG&! VK  
  } 9W0*|!tQ,+  
 } dS8ydG2  
 return bRemoved; g< xE}[gF  
} {O:{F?  
aGd wuD  
void VerifyWindow() j 1;<3)%0  
{ DRpF EWsm  
 for(int i=0;i<MAX_KEY;i++){ >F>VlRg  
  if(hCallWnd!=NULL){ km*Y#`{  
   if(!IsWindow(hCallWnd)){ KL6B!B{;  
    hCallWnd=NULL; 2!6E~<~HC  
    HotKey=0; d>?C?F  
    HotKeyMask=0; * RyU*au  
    KeyCount--; +_L]d6  
   } iZLy#5(St  
  } '4Jf[  
 } #M||t|9iu?  
} J'ZC5Xr  
&b`'RZe  
BOOL CHookApp::InitInstance() gnGh )  
{ wfv\xHG  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); jEE!H /  
 hins=AfxGetInstanceHandle(); 8_E(.]U  
 InitHotkey(); twu,yC!  
 return CWinApp::InitInstance(); XG*> yra`  
} otdRz<C  
z4 <_>)p  
int CHookApp::ExitInstance() Oi'y0S~ g  
{ R7"7 Rx   
 VerifyWindow(); Rc:}%a%e  
 UnInit(); >|z:CX$]  
 return CWinApp::ExitInstance(); tz8 fZ*n  
} 8k3y"239t  
Wsgp#W+  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file qw$9i.Z  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) <S=( `D  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 064k;|>D  
#if _MSC_VER > 1000 oNIYO*[  
#pragma once < =~=IZ)  
#endif // _MSC_VER > 1000 I-}ms  
U3C"o|   
class CCaptureDlg : public CDialog QJj='+R>  
{ G pI4QzR  
 // Construction cxQAp  
 public: B~^*@5#0|  
  BOOL bTray; h (q,T$7 W  
  BOOL bRegistered; +SF+$^T  
  BOOL RegisterHotkey(); '#yqw%  
  UCHAR cKey; >DUTmJxv  
  UCHAR cMask; n 7i5A:  
  void DeleteIcon(); 0TaI"/ai  
  void AddIcon(); ;<q 2  
  UINT nCount; \i/HHP[%  
  void SaveBmp(); ~&<t++ g  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor  =   
  // Dialog Data IA<>+NS  
  //{{AFX_DATA(CCaptureDlg) vQ* RrHG?c  
  enum { IDD = IDD_CAPTURE_DIALOG }; 9tU"+  
  CComboBox m_Key; O Bcz'f~  
  BOOL m_bControl; NTD1QJ  
  BOOL m_bAlt; zBl L98  
  BOOL m_bShift; Wlxmp['Bh  
  CString m_Path; @I-,5F|r  
  CString m_Number; $m)gfI]9  
  //}}AFX_DATA [.^ol6  
  // ClassWizard generated virtual function overrides &9^4- 5]  
  //{{AFX_VIRTUAL(CCaptureDlg) #2s}s<Sc;  
 public: ZM})l9_o"  
  virtual BOOL PreTranslateMessage(MSG* pMsg); \c<;!vkZ04  
 protected: rH!sImz,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support VsJ+-IHm  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 1Xo0(*O  
  //}}AFX_VIRTUAL (D%vN&F  
  // Implementation L /:^;j`c  
 protected: "D8WdV(  
  HICON m_hIcon; r :$tvT*  
  // Generated message map functions /6Q]f  
  //{{AFX_MSG(CCaptureDlg) "o+?vx-  
  virtual BOOL OnInitDialog(); .n1&Jsey  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); g=[OH  
  afx_msg void OnPaint(); =]]1x_GB  
  afx_msg HCURSOR OnQueryDragIcon(); J{^md0l  
  virtual void OnCancel(); Mib .,J~  
  afx_msg void OnAbout(); eM_;rMCr}  
  afx_msg void OnBrowse(); CDM6o!ur3  
  afx_msg void OnChange(); _\KFMe= PV  
 //}}AFX_MSG Dc@O Mr  
 DECLARE_MESSAGE_MAP() 5"@>>"3U  
}; {Y@shf;  
#endif ~9 .=t'  
7tXy3-~biz  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 'bJGQ[c  
#include "stdafx.h" ,\J 8(,%L  
#include "Capture.h" <wk  
#include "CaptureDlg.h" 6`O,mpPu4G  
#include <windowsx.h> ru@#s2  
#pragma comment(lib,"hook.lib") L&DjNu`!9  
#ifdef _DEBUG Sc]K-]1(H  
#define new DEBUG_NEW iq*im$9 J  
#undef THIS_FILE F$)l8}  
static char THIS_FILE[] = __FILE__; 2PYnzAsl  
#endif ;O% H]oN  
#define IDM_SHELL WM_USER+1 \KnRQtlI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); TdgK.g 4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *0xL(  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; #Z1-+X8P  
class CAboutDlg : public CDialog mA{?E9W  
{ udqrHR5  
 public: TG}owG]]  
  CAboutDlg(); y62f{ks_/  
  // Dialog Data sJ|pR=g)!  
  //{{AFX_DATA(CAboutDlg)  >9!J?HA  
  enum { IDD = IDD_ABOUTBOX }; mFF4qbe  
  //}}AFX_DATA S[exnZ*Y  
  // ClassWizard generated virtual function overrides -DdHl8  
  //{{AFX_VIRTUAL(CAboutDlg) *sOb I(&  
 protected: 3~T ~Bs  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ekvs3a^  
  //}}AFX_VIRTUAL B^/MwD>%  
  // Implementation EjLq&QR.  
 protected: $KYGQP  
  //{{AFX_MSG(CAboutDlg) WVRIq'  
  //}}AFX_MSG >t3_]n1e  
  DECLARE_MESSAGE_MAP() VKl,m ;&N  
}; 6 X~><r  
).;{'8Q  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |-x-CSN  
{ n"htx|v  
 //{{AFX_DATA_INIT(CAboutDlg) OW@%H;b  
 //}}AFX_DATA_INIT Jz` jN~  
} BDI@h%tJb:  
:oZ<[#p"*  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) aO(PVS|P  
{ D+3?p  
 CDialog::DoDataExchange(pDX); xT"V9t[f  
 //{{AFX_DATA_MAP(CAboutDlg) QCW4gIp  
 //}}AFX_DATA_MAP 9>&zOITTaL  
} bI &<L O  
@4*:qj?  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?Z 2,?G  
 //{{AFX_MSG_MAP(CAboutDlg) iSCkV2  
 // No message handlers `-uE(qp  
 //}}AFX_MSG_MAP ^wolY0p  
END_MESSAGE_MAP() S/XU4i:aV  
aDdGhB  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) \Ip)Lm0  
: CDialog(CCaptureDlg::IDD, pParent) F,Q;sq  
{ 3P6O]x<-?  
 //{{AFX_DATA_INIT(CCaptureDlg) %3a-@!|1<  
  m_bControl = FALSE; >Bb X:  
  m_bAlt = FALSE; gS'{JZu2  
  m_bShift = FALSE; 9,'m,2%W  
  m_Path = _T("c:\\"); Qb^G1#r@C  
  m_Number = _T("0 picture captured."); _/LGGt4&%  
  nCount=0; f\hMTebma$  
  bRegistered=FALSE; ]?4;Lw  
  bTray=FALSE; ~o!- [  
 //}}AFX_DATA_INIT Vx$;wU Y  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 %Xd*2q4*  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 'Tm1Mh0Fso  
} gsyOf*Q$  
J#..xJ?XRD  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) i\6CE|  
{ DEZww9T2Qs  
 CDialog::DoDataExchange(pDX); F-/z@tM  
 //{{AFX_DATA_MAP(CCaptureDlg) m=01V5_  
  DDX_Control(pDX, IDC_KEY, m_Key); lAU99(GXV  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); o^@"eG$,  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 'GJB9i+a^  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); [h3xW  
  DDX_Text(pDX, IDC_PATH, m_Path); 3^UdB9j;  
  DDX_Text(pDX, IDC_NUMBER, m_Number); rRq60A  
 //}}AFX_DATA_MAP Cq2Wpu-u  
} k4ti#3W5eG  
Bz ;r<Kn  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) vUpAW[[  
//{{AFX_MSG_MAP(CCaptureDlg) g0grfGo2p  
 ON_WM_SYSCOMMAND() m;dwt1'Zw  
 ON_WM_PAINT() >R F|Q  
 ON_WM_QUERYDRAGICON() 2$Mnwxfk  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) AT"gRCU$4  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) a!$kKOK  
 ON_BN_CLICKED(ID_CHANGE, OnChange) >B{NxL3->  
//}}AFX_MSG_MAP ~*Y#Y{  
END_MESSAGE_MAP() FW|& iS$  
X+;[Gc}(W  
BOOL CCaptureDlg::OnInitDialog() ?Zb+xNKJ(  
{ 3NpB1lgh&:  
 CDialog::OnInitDialog(); q}P@}TE  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <K[y~9u  
 ASSERT(IDM_ABOUTBOX < 0xF000); 63W;N7@  
 CMenu* pSysMenu = GetSystemMenu(FALSE); j*DPW)RkKX  
 if (pSysMenu != NULL) LlX)xJ  
 { |C4fg6XDL  
  CString strAboutMenu; (GmBv  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ^ j\LB23  
  if (!strAboutMenu.IsEmpty()) }emUpju<C  
  { 7_\sx7h{3  
   pSysMenu->AppendMenu(MF_SEPARATOR); Yj&Sb  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); e"04jd/  
  } 9[.HWe,  
 } { ptd OrN  
 SetIcon(m_hIcon, TRUE); // Set big icon XG/xMz~  
 SetIcon(m_hIcon, FALSE); // Set small icon Ooz ,?wU6  
 m_Key.SetCurSel(0); .==D?#bn  
 RegisterHotkey(); 6iU&9Z<%  
 CMenu* pMenu=GetSystemMenu(FALSE); 8o5[tl ?w  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); [{7#IZL  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); fUjo',<s  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); fB$a )~  
 return TRUE; // return TRUE unless you set the focus to a control E`fG9:6l]  
} ,{0Y:/T'  
K3!3[dR*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) @Go_5X(  
{ juHL$SGC  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Ms!EK  
 { ws0qwv#  
  CAboutDlg dlgAbout; i6if\B  
  dlgAbout.DoModal(); G)7U &B  
 } 60+zoL'  
 else 6^b)Q(Edut  
 { 64/ZfXD  
  CDialog::OnSysCommand(nID, lParam); *O_fw 0jV  
 } G8M~}I/)  
} 3:WqUb\QK  
%OBW/Ti  
void CCaptureDlg::OnPaint() 0<m7:D Gd  
{ & BPYlfB1  
 if (IsIconic()) d1D f`  
 { DN2 ]Y'  
  CPaintDC dc(this); // device context for painting s>>&3jfM  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); (e7!p=D  
  // Center icon in client rectangle |}G"^r  
  int cxIcon = GetSystemMetrics(SM_CXICON); N1'`^ay$  
  int cyIcon = GetSystemMetrics(SM_CYICON); egq,)6>  
  CRect rect; w 0BphK[  
  GetClientRect(&rect); eft=k}  
  int x = (rect.Width() - cxIcon + 1) / 2; pQa51nc  
  int y = (rect.Height() - cyIcon + 1) / 2; #p(gB)o:l  
  // Draw the icon Xw4Eti._D  
  dc.DrawIcon(x, y, m_hIcon); *?m)VvR>|  
 } X/4CXtX^  
 else oXG_6E!^  
 { [\ao#f0WR  
  CDialog::OnPaint(); \ja6g  
 } ..`c# O&  
} <,~OcJG(   
x/s:/YN'  
HCURSOR CCaptureDlg::OnQueryDragIcon() AIHH@z   
{ [PIMG2"G  
 return (HCURSOR) m_hIcon; bsQ'kBD  
} HJl?@& l/  
I*-\u  
void CCaptureDlg::OnCancel() 8&@=Anc&q  
{ m^ xTV-#l@  
 if(bTray) { I{ 0rV  
  DeleteIcon(); 3WwS+6R  
  CDialog::OnCancel(); >j?5?J"  
} ;dzy 5o3  
!BoGSI  
void CCaptureDlg::OnAbout() \g34YY^L3  
{ )g:5}+  
 CAboutDlg dlg; tb&?BCp  
 dlg.DoModal(); -m`|Sq  
} 6{+yAsI  
L2VwW  
void CCaptureDlg::OnBrowse() fJ Ll-H  
{ g}+|0FTV  
 CString str; Mk*4J]PP  
 BROWSEINFO bi;  %j&vV>2  
 char name[MAX_PATH]; +-!3ruwSn  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); d*6f,z2=  
 bi.hwndOwner=GetSafeHwnd(); :BxO6@>Xc  
 bi.pszDisplayName=name; H1-DK+Q:  
 bi.lpszTitle="Select folder"; BwHJr(n  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; .B`$hxl*0c  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ,kJ'_mq  
 if(idl==NULL) ,l&?%H9q  
  return;  P@O_MT  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); =i)%AnZ^9  
 str.ReleaseBuffer(); \92M\S  
 m_Path=str; q{9vY:`[  
 if(str.GetAt(str.GetLength()-1)!='\\') NO*, }aeG  
  m_Path+="\\"; :a*>PMTn  
 UpdateData(FALSE); vC,FE )'  
}  9tpyrGv  
Vg$d|m${  
void CCaptureDlg::SaveBmp() F+*E}QpM  
{ 6[t<g=  
 CDC dc; ~ikp'5  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ?6 2zv[#  
 CBitmap bm; hrniZ^  
 int Width=GetSystemMetrics(SM_CXSCREEN); [+WsVwyf?  
 int Height=GetSystemMetrics(SM_CYSCREEN); mu B Y  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ?w/p 9j#  
 CDC tdc; | lLe^FM  
 tdc.CreateCompatibleDC(&dc); a#1r'z~]}  
 CBitmap*pOld=tdc.SelectObject(&bm); KGJSGvo+y  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); KF7w{A){  
 tdc.SelectObject(pOld); @ 51!3jeu  
 BITMAP btm; Oem1=QpaC  
 bm.GetBitmap(&btm); ~|KqG  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; R6<'J?k  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); -)-: rRx-  
 BITMAPINFOHEADER bih; T.#_v# oM  
 bih.biBitCount=btm.bmBitsPixel; xI<l1@  
 bih.biClrImportant=0; 'wPX.h?  
 bih.biClrUsed=0; ^$oa`B^2JM  
 bih.biCompression=0; Apu- 9|oP  
 bih.biHeight=btm.bmHeight; ]:f.="  
 bih.biPlanes=1; ^?e[$}  
 bih.biSize=sizeof(BITMAPINFOHEADER); >.SO2w  
 bih.biSizeImage=size; T]0K4dp+  
 bih.biWidth=btm.bmWidth; Uv59 XF$  
 bih.biXPelsPerMeter=0; M.H!dZ  
 bih.biYPelsPerMeter=0; S:!5 |o|  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); KLe6V+ki*  
 static int filecount=0; ~ T}D#}  
 CString name; E zcch1  
 name.Format("pict%04d.bmp",filecount++); Hl$qmq  
 name=m_Path+name; Q^{TcL8  
 BITMAPFILEHEADER bfh; g(P7CX+y  
 bfh.bfReserved1=bfh.bfReserved2=0; /,I?"&FWc  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 2@(+l*.Q  
 bfh.bfSize=54+size; *c#DB{N  
 bfh.bfOffBits=54; |e8A)xM]wC  
 CFile bf; (U5XB [r_P  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ZvuY] =^3  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 5^uX!_ r`  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); _U}|Le@ e  
  bf.WriteHuge(lpData,size); 3+>R%TX6i<  
  bf.Close(); dtuCA"D  
  nCount++; .;?ha'  
 } *effDNE!  
 GlobalFreePtr(lpData); yMW3mx301j  
 if(nCount==1) _U*R_2aV  
  m_Number.Format("%d picture captured.",nCount); O4-#)#-)S~  
 else xpa+R^D5G  
  m_Number.Format("%d pictures captured.",nCount); 0of:tZU  
  UpdateData(FALSE); K;/f?3q  
} BSS4}qyS  
0uKm)t/  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) a/E(GQ,,  
{ CV |Ae [  
 if(pMsg -> message == WM_KEYDOWN) ~a=]w#-KD  
 { AYNz {9  
  if(pMsg -> wParam == VK_ESCAPE) nILUo2e~  
   return TRUE; wOUCe#P|r  
  if(pMsg -> wParam == VK_RETURN) >o"s1* {  
   return TRUE; o ^w^dgJ  
 } (QFZM"G  
 return CDialog::PreTranslateMessage(pMsg); Z+R-}<   
} #d8]cm=  
bIt{kzuQC  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) qUe2(/TQu  
{ <mLU-'c@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ b0f6?s  
  SaveBmp(); (Vey]J  
  return FALSE; ^N}{M$  
} 7<jr0)  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ &}gH!5L m  
 CMenu pop; ]mBlXE:Z  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #)D$\0ag  
 CMenu*pMenu=pop.GetSubMenu(0); BI2'NN\  
 pMenu->SetDefaultItem(ID_EXITICON); Q-_;.xy#4  
 CPoint pt; a&)$s;  
 GetCursorPos(&pt); !G;BYr>X  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this);  OG IN-  
 if(id==ID_EXITICON) 6#d+BBKIc  
  DeleteIcon(); Md:*[]<~  
 else if(id==ID_EXIT) uF,%N   
  OnCancel(); t2ui9:g4j  
 return FALSE; Pw|/PfG  
} #SLi v  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); W*c^(W  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 1%.CtTi  
 AddIcon(); ~O;?;@  
 return res; %|}7YH41  
}  qzD  
K(mzt[n(  
void CCaptureDlg::AddIcon() w4y ???90)  
{ 4>=Y@z  
 NOTIFYICONDATA data; O6-"q+H)  
 data.cbSize=sizeof(NOTIFYICONDATA); F8m@mh*8>  
 CString tip; j~2t^Qz  
 tip.LoadString(IDS_ICONTIP); -J!k|GK#MX  
 data.hIcon=GetIcon(0); Iq;a!Lya-  
 data.hWnd=GetSafeHwnd(); tG,xG&  
 strcpy(data.szTip,tip); iaJN~m\ M  
 data.uCallbackMessage=IDM_SHELL; ^oHK.x#{  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; U,/9fzgd  
 data.uID=98; ;hDIoSz  
 Shell_NotifyIcon(NIM_ADD,&data); XK l3B=h  
 ShowWindow(SW_HIDE); 9OF(UFgS  
 bTray=TRUE; (j}Wt8  
} i#lO{ ]  
=>C3IR/  
void CCaptureDlg::DeleteIcon() [Az^i>iH  
{ nRZ T~S4  
 NOTIFYICONDATA data; b|Ed@C  
 data.cbSize=sizeof(NOTIFYICONDATA); xJzO?a'  
 data.hWnd=GetSafeHwnd(); . =A|  
 data.uID=98; ">I50#bT  
 Shell_NotifyIcon(NIM_DELETE,&data); () HIcu*i  
 ShowWindow(SW_SHOW); 4s&koH(x  
 SetForegroundWindow(); @n=FSn6 c  
 ShowWindow(SW_SHOWNORMAL); 5#? HL  
 bTray=FALSE; 9T;l*  
} QEL3b4Vm  
!P:~oo =  
void CCaptureDlg::OnChange() YKj P E  
{ A^7Y%  
 RegisterHotkey(); &_6B{Q  
} z2V_nkI  
hzk]kM/OC  
BOOL CCaptureDlg::RegisterHotkey() iGeuO[ ^  
{ F[|aDj@q e  
 UpdateData(); \h/aD1 &g  
 UCHAR mask=0; l< |)LD q~  
 UCHAR key=0; r+l3J>:K  
 if(m_bControl) dJg72?"ka  
  mask|=4; EEp,Z`  
 if(m_bAlt) ~_L_un.R  
  mask|=2; tTrue?  
 if(m_bShift) 78+PG(Q_M  
  mask|=1; Q[F$6m%o  
  key=Key_Table[m_Key.GetCurSel()]; zw X 1&rN  
 if(bRegistered){ w0t||qj^>"  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 4THGHS^  
  bRegistered=FALSE; ;lo!o9`<  
 } <N;HB&mr  
 cMask=mask; j.rJfbE|X  
 cKey=key; #$>m`r  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); F0FF:><  
 return bRegistered; a)8M'f_z  
} hbdM}"&]  
0~XZ  
  四、小结 SfwAMNCe  
V5LzUg]  
  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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