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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: J8Db AB4X  
  .ai9PsZ?V  
  一、实现方法 0)44*T  
K)@Buu&,p  
  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: tAi9mm;k  
X*q C:]e  
#pragma data_seg("shareddata") B+ sqEj-  
HHOOK hHook =NULL; //钩子句柄 <}1%">RA  
UINT nHookCount =0; //挂接的程序数目 7y7y<`)I5  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 :_zKUv]  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 .?j8{>  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey wpI4P:  
static int KeyCount =0; 7rg[5hP T  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 g3rFJc  
#pragma data_seg() PyF4uCn"H  
}O{"qs#)  
  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。 PSE| 4{'  
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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: rT)R*3  
uK5Px!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR hj1 jY  
cKey,UCHAR cMask) :W.(,65c  
{ 0E[Se|!  
 BOOL bAdded=FALSE; 4et#Q  
 for(int index=0;index<MAX_KEY;index++){ qZ }XjL  
  if(hCallWnd[index]==0){ N|LVLsK  
   hCallWnd[index]=hWnd; 0/]vmDr  
   HotKey[index]=cKey; ".ZiR7Z:$Y  
   HotKeyMask[index]=cMask; bm.H0rHR4  
   bAdded=TRUE; QD~ `UJe>  
   KeyCount++; YPEd XU8}  
   break; c y$$}  
  } r&DK> H  
 } |i8dI)b  
 return bAdded; \&90$>h  
} %"2B1^o>  
//删除热键 lhTbgM  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4UkLvL1x  
{ /B7 GH5  
 BOOL bRemoved=FALSE; dp+Y?ufr  
 for(int index=0;index<MAX_KEY;index++){ x6tY _lzJ  
  if(hCallWnd[index]==hWnd){ !W7ekPnK  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?J ?!%Mw  
    hCallWnd[index]=NULL; e>)5j1  
    HotKey[index]=0; e8 .bH#  
    HotKeyMask[index]=0; q4N$.hpb  
    bRemoved=TRUE; MzG.Qh'z  
    KeyCount--; kv b-=  
    break; 0k 8SDRWU  
   } 7 d5x4^EYE  
  } /K<Nlxcm  
 } B=Os?'2[  
 return bRemoved; 0]~n8mB>  
} 0%/(p?]M  
^D|c  
5ntP{p%>  
  DLL中的钩子函数如下: zL'n J  
dr o42#$Mo  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) opC11c/  
{ A9gl|II  
 BOOL bProcessed=FALSE; iz(+(M  
 if(HC_ACTION==nCode) '3VrHL@@g  
 { 9Ba<'wk/>"  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 !%@{S8IP.v  
   switch(wParam) (" %yV_R  
   {  ~/%){t/uLY  
    case VK_MENU: oH0\6:S  
     MaskBits&=~ALTBIT; )%7A. UO)  
     break; enj2xye%Y  
    case VK_CONTROL: AtOB'=ph*  
     MaskBits&=~CTRLBIT; ez>@'yhK  
     break; )J0VB't  
    case VK_SHIFT: t;'.D @  
     MaskBits&=~SHIFTBIT; ![V- e  
     break; @:I/lg=Qd  
    default: //judge the key and send message <k!G%R<9  
     break; n6}1{\  
   } Zn/ /u<D  
   for(int index=0;index<MAX_KEY;index++){ t}nRWo  
    if(hCallWnd[index]==NULL) 3a0C<hW  
     continue; );[`rXH_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0&x)5^lG  
    { Su7?-vY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  lzuZv$K  
     bProcessed=TRUE; HChewrUAn  
    } P +SCX#{y  
   } T Bco  
  } GFid riC  
  else if((lParam&0xc000ffff)==1){ //有键按下 ES>3Cf  
   switch(wParam) OjI*HC  
   { ')+EW" e  
    case VK_MENU: #C`!yU6(  
     MaskBits|=ALTBIT; [% jg;m  
     break; ZU|nKt<GK  
    case VK_CONTROL: 1"k@O)?JP  
     MaskBits|=CTRLBIT; :<W 8uDAs  
     break; QI- 3m qL  
    case VK_SHIFT: [~3p+  
     MaskBits|=SHIFTBIT; *)1,W+A5L  
     break; {IVqV6:  
    default: //judge the key and send message m[pz u2R  
     break; WJ*DWyd''  
   } ol\IT9Zb~  
   for(int index=0;index<MAX_KEY;index++){ S]>_o"|HV  
    if(hCallWnd[index]==NULL) ^ =ikxZyO  
     continue; L{ -w9(S`i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <5q}j-Q  
    { PD?H5W3@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); u+'=EGl  
     bProcessed=TRUE; [F%\1xh  
    } P<hqr;  
   } -~q]0>  
  } o\#C] pp  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 R&QT  'i  
   for(int index=0;index<MAX_KEY;index++){ yBoZ@9Do  
    if(hCallWnd[index]==NULL) ]V_9[=%  
     continue; 0)B+ :  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) m8?(.BJ%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); KK+Mxoj,  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 0-9&d(L1g  
   } $ ]HIYYs  
  } Du/s  
 } [D)A+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Km?i{TW  
} ICi- iX  
Rl~Tw9  
  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:  xOT3>$  
+Il=gL1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JnZxP> 2B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G\ofg  
dw-r}Qioe  
  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: .UcS4JU  
y+PukHY  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p d6d(  
{ e:l 6;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) R3~&|>7/T  
 { (F)zj<{f  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 r?Vob}'Pt]  
  SaveBmp(); dM') < lF  
  return FALSE; N%-nxbI\  
 } Cur) |  
 …… //其它处理及默认处理 01Aa.i^d(  
} S4_Y^   
Czp:y8YX-  
uxcj3xE#d  
  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。 8+gn Wy  
r,}Zc W+  
  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。 Hq9(6w9w  
'Zzm'pC  
  二、编程步骤 1/n3qJyx2}  
s0:1G -I  
  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"; )_jO8 )jB  
!CWqI)=  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; =Yfs=+O  
v=4TU \b%  
  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; n)0{mDf%  
)fa  
  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; Ort\J~ O  
J 4gIkZD  
  5、 添加代码,编译运行程序。 >3bpa<M_  
yE7pCgXt  
三、程序代码 Np<Aak  
l|K8+5L  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL |J\/U,nh  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) jK{MU) D+  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ !xvPG  
#if _MSC_VER > 1000 >Cf`F{X' U  
#pragma once [bp"U*!9P  
#endif // _MSC_VER > 1000 M3Z yf  
#ifndef __AFXWIN_H__ __9673y  
#error include 'stdafx.h' before including this file for PCH NOx| #  
#endif TwH(47|?Nt  
#include "resource.h" // main symbols uC3$iY:_e  
class CHookApp : public CWinApp 6/z}-;,W'  
{ Fh "S[e  
 public: ReRRFkO"2  
  CHookApp(); H(AYtnvB  
  // Overrides BZj[C=#x  
  // ClassWizard generated virtual function overrides H [v~  
  //{{AFX_VIRTUAL(CHookApp) 1>2397  
 public: `DwlS!0  
  virtual BOOL InitInstance(); iTX.? *  
  virtual int ExitInstance(); w+}dm^X  
  //}}AFX_VIRTUAL 'i,<j s3\f  
  //{{AFX_MSG(CHookApp) uYl ?Q  
  // NOTE - the ClassWizard will add and remove member functions here. My ^pQ]@  
  // DO NOT EDIT what you see in these blocks of generated code ! e\h:==f  
  //}}AFX_MSG ka'MF;!rc  
  DECLARE_MESSAGE_MAP() 52"/Zr}j  
}; #RSxo 4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); |\ ay^@N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NlDM/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "mOoGy, (  
BOOL InitHotkey(); ]D%[GO//!  
BOOL UnInit(); ;gc 2vDMv  
#endif o ZAjta_4  
d0xV<{,-  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. @@5u{K  
#include "stdafx.h" o{ (v  
#include "hook.h" X#o:-FKf  
#include <windowsx.h> &K4o8Qz  
#ifdef _DEBUG vhg4E80Kr  
#define new DEBUG_NEW 8RK\B%UW  
#undef THIS_FILE QdRMp n}q  
static char THIS_FILE[] = __FILE__; JDP#tA3  
#endif 0I k@d'7  
#define MAX_KEY 100 s?2;u p*D  
#define CTRLBIT 0x04 KyDBCCOv  
#define ALTBIT 0x02 _% P%~`?!  
#define SHIFTBIT 0x01 F 6Ol5  
#pragma data_seg("shareddata") Ax\Fg 5  
HHOOK hHook =NULL; %cv%u6 b  
UINT nHookCount =0; 5 9X|l&/  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey -LY_7Kg  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ^TjFR*S'E  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey pQ>V]M  
static int KeyCount =0; m/ukH{H1%  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift c{ <3\  
#pragma data_seg() "~;jFB8  
HINSTANCE hins; r[lHYO  
void VerifyWindow(); C]`Y PM5  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) qN)cB?+  
//{{AFX_MSG_MAP(CHookApp) 4$J/e?i  
// NOTE - the ClassWizard will add and remove mapping macros here. qdm!]w.G5  
// DO NOT EDIT what you see in these blocks of generated code! r=k}EP&<  
//}}AFX_MSG_MAP  WsoB!m  
END_MESSAGE_MAP() b:JOR@O  
*dTw$T#  
CHookApp::CHookApp() qm '$R3g  
{ p?`N<ykF<  
 // TODO: add construction code here, ,Q:dAe[ZsX  
 // Place all significant initialization in InitInstance @@$ _TaI  
} EZHEJW'JnE  
=FKB)#N  
CHookApp theApp; -(2-zznZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) AE$)RhY`  
{ zqeU>V~<F  
 BOOL bProcessed=FALSE; 51&T`i  
 if(HC_ACTION==nCode) f8j^a?d|  
 { UOY1^wY  
  if((lParam&0xc0000000)==0xc0000000){// Key up UWnH2  
   switch(wParam) T;%SB&  
   { ygPZkvZ  
    case VK_MENU: fG{oi(T  
     MaskBits&=~ALTBIT; 07#!b~N  
     break; :Y'nye3:  
    case VK_CONTROL: p[wjHfIq  
     MaskBits&=~CTRLBIT; ,t[D1KZt  
     break; 5|b/G  
    case VK_SHIFT: f]lDJ?+ M  
     MaskBits&=~SHIFTBIT; i6-K!  
     break; #=tWCxf=  
    default: //judge the key and send message *vb)d0}P  
     break; @Q^;qMy  
   } @4|/| !  
   for(int index=0;index<MAX_KEY;index++){ v:>P;\]r9M  
    if(hCallWnd[index]==NULL) 8 2qe|XD4p  
     continue; UvI!e4_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) pI!55w|  
    { :b=0_<G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ob;oxJ@[c  
     bProcessed=TRUE; v!uLd.(  
    } BE2{qO{  
   } ,..b)H5n  
  } [q@%)F  
  else if((lParam&0xc000ffff)==1){ //Key down G9i#_  
   switch(wParam) jyC6:BNust  
   { qL#R XUTP  
    case VK_MENU: IF}r%%'Y$  
     MaskBits|=ALTBIT; I,[EL{fz  
     break; }>w; +XU  
    case VK_CONTROL: d?K8Ygz  
     MaskBits|=CTRLBIT; dO@iq^9-  
     break; 8ah]D  
    case VK_SHIFT: r:IU +3  
     MaskBits|=SHIFTBIT; n&fV3[m`2  
     break; a$GKrc,z  
    default: //judge the key and send message cwroG#jGT  
     break; m|k,8guG  
   } 7Av]f3Zr  
   for(int index=0;index<MAX_KEY;index++) 4Y2>w  
   { 4L0LT>'M\  
    if(hCallWnd[index]==NULL) c"xaN  
     continue; pIXQ/(h31  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ox6rR  
    { .DQ]q o]OG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^#o.WL%4/B  
     bProcessed=TRUE; u *< (B  
    } ?Y9?x,x  
   } %9lxE[/  
  } l0_V-|x  
  if(!bProcessed){ SS`C0&I@p  
   for(int index=0;index<MAX_KEY;index++){ :wZZ 1qa  
    if(hCallWnd[index]==NULL) by<2hLB9Q  
     continue; (tgaH,G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) u;!Rv E8N  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `+uXL9mo  
   } ~I<y^]2{  
  } $enh45Wy  
 } 9 2EMDKJ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -&? -  
} /p>[$`Aq  
-%.V0=G(Z  
BOOL InitHotkey() iH>djGhTh  
{ U*@_T3N  
 if(hHook!=NULL){ { SfU!  
  nHookCount++; `g=~u{ 0  
  return TRUE; *pMA V [^  
 } !xI![N^  
 else =Vs<DO{|4q  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); H[r0jREK  
  if(hHook!=NULL) rXPXO=F1/  
   nHookCount++; S&*pR3,u  
  return (hHook!=NULL); j66@E\dN  
} #vSI_rt9I  
BOOL UnInit() b<n)`;  
{ %?fzT+-=%  
 if(nHookCount>1){ }>w4!  
  nHookCount--; 4Z] 35*  
  return TRUE; C#Jj;Gd  
 } msylb~^  
 BOOL unhooked = UnhookWindowsHookEx(hHook); J^:~#`8  
 if(unhooked==TRUE){ d%hA~E1rR  
  nHookCount=0; m 5Kx}H~  
  hHook=NULL; Mx"tUoU6z  
 } #"_MY-  
 return unhooked; i1 &'Zh  
} N,|oV|i  
q4{tH  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Fn,|J[sC  
{ GLyh1qNX  
 BOOL bAdded=FALSE; n&]w* (,  
 for(int index=0;index<MAX_KEY;index++){ m!_ghD{5h  
  if(hCallWnd[index]==0){ W=?87PkJu  
   hCallWnd[index]=hWnd; keOW{:^i  
   HotKey[index]=cKey; C)w *aU,(  
   HotKeyMask[index]=cMask; ,whNh  
   bAdded=TRUE; mxGN[ %ve  
   KeyCount++; V*}zwm s6  
   break; m##=iB|;  
  } 9:o3JGHSc  
 } B*IDx`^Y  
 return bAdded; 6K}=K?3Z  
} ;^]A@WN6_  
=HHg:"  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _=5ZB_I  
{ K dm5O@tq  
 BOOL bRemoved=FALSE; &u-Bu;G.e  
 for(int index=0;index<MAX_KEY;index++){ <.ky1aex7  
  if(hCallWnd[index]==hWnd){ d}_c (  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ L ]c9  
    hCallWnd[index]=NULL; cmI#R1\  
    HotKey[index]=0; ub5hX{uT  
    HotKeyMask[index]=0; Hea<!zPH  
    bRemoved=TRUE; hT"K}d;X  
    KeyCount--; E6M: ^p*<  
    break; _ GSw\r  
   } N/BU%c ph+  
  } 'Aj>+H<B  
 } 99K+7G\{  
 return bRemoved; N&=2 /  
} |U $-d^ZJ  
]?{lQ0vw'w  
void VerifyWindow() AHJ;>"]  
{ 6^;!9$G|D*  
 for(int i=0;i<MAX_KEY;i++){ 6l'y  
  if(hCallWnd!=NULL){ 'OCo1|iK~  
   if(!IsWindow(hCallWnd)){ ->=++  
    hCallWnd=NULL; DT4RodE$  
    HotKey=0; uszSFe]E  
    HotKeyMask=0; )AXH^&  
    KeyCount--; }3w b*,Sbz  
   } ~b0qrjF;O  
  } i&)C,  
 } 2]=I'U<E!  
} @~3c"q;i7  
dRm'$ G9  
BOOL CHookApp::InitInstance() j*d~h$[k  
{ VAGMI+ -  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4tJ4X' U  
 hins=AfxGetInstanceHandle(); 0!`7kZrN  
 InitHotkey(); ~e9INZe-j  
 return CWinApp::InitInstance(); !U:s.^{  
} ecpUp39\  
y#;VGf6lj  
int CHookApp::ExitInstance() ~79Qg{+]N  
{ Tj5@OcA$  
 VerifyWindow(); J5_Y\@  
 UnInit(); WG}CPkj  
 return CWinApp::ExitInstance(); y51D-vj  
} E^a `IA  
IQe[ CcM  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file :<k|u!b}y  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 4!vUksM  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 2_n*u^X:_  
#if _MSC_VER > 1000 \N+Ta:U1P  
#pragma once LoE(W|nj  
#endif // _MSC_VER > 1000 <Cu?$  
e-3pg?M  
class CCaptureDlg : public CDialog O&iYGREO  
{ tkqBCKpDa  
 // Construction ZM`P~N1?)g  
 public: a9zph2o-  
  BOOL bTray; x9A ZS#e)[  
  BOOL bRegistered; O>M*mTM  
  BOOL RegisterHotkey(); #UCQiQfP  
  UCHAR cKey; yVQz<tX|  
  UCHAR cMask; Y zW7;U S  
  void DeleteIcon(); "UGj4^1f  
  void AddIcon(); =^y{@[p`(  
  UINT nCount; 3H#/u! W  
  void SaveBmp(); #r)1<}_e#  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor p]z54 ~  
  // Dialog Data /3 Ix,7  
  //{{AFX_DATA(CCaptureDlg) DPQGh`J  
  enum { IDD = IDD_CAPTURE_DIALOG }; MI'l4<>u  
  CComboBox m_Key; W<|K  
  BOOL m_bControl; Bi :wP/>v  
  BOOL m_bAlt; oEoJa:h  
  BOOL m_bShift; }9udo,RWu  
  CString m_Path; ?J@qg20z  
  CString m_Number; `W$0T;MPF  
  //}}AFX_DATA ?En| _E_C  
  // ClassWizard generated virtual function overrides _JJKbi  
  //{{AFX_VIRTUAL(CCaptureDlg) .4re0:V  
 public: i~B@(,  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 8Gl5)=2  
 protected: ZQ'  z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C=aj&  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Nwl RPyt  
  //}}AFX_VIRTUAL *R\/#Y|  
  // Implementation -b\ V(@5  
 protected: 3p 1EScH  
  HICON m_hIcon; 6(^Upk=59  
  // Generated message map functions GHC?Tp   
  //{{AFX_MSG(CCaptureDlg) |5B,cB_  
  virtual BOOL OnInitDialog(); FWpN:|X BS  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 4:eq{n  
  afx_msg void OnPaint(); Y:!/4GF  
  afx_msg HCURSOR OnQueryDragIcon(); xCp+<|1   
  virtual void OnCancel(); ?~JxO/K  
  afx_msg void OnAbout(); pY!dG-;  
  afx_msg void OnBrowse(); |8qK%n f}  
  afx_msg void OnChange(); u~- fK'/!|  
 //}}AFX_MSG QB3d7e)8>  
 DECLARE_MESSAGE_MAP() Prb_/B Dd  
}; t#pqXY/;D  
#endif eIUuq&(  
x #X#V\w=  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file A6UdWK  
#include "stdafx.h" a}qse5Fr  
#include "Capture.h" M`+e'vdw  
#include "CaptureDlg.h" r5!x,{E6  
#include <windowsx.h> ^o6)[_L  
#pragma comment(lib,"hook.lib") SXo[[ao  
#ifdef _DEBUG 3pTS@  
#define new DEBUG_NEW kV:FJx0xP  
#undef THIS_FILE ;Ma/b=Y  
static char THIS_FILE[] = __FILE__; 8LQ59K_WX  
#endif ?F87C[o  
#define IDM_SHELL WM_USER+1 Y = g>r]2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $dZ>bXUw:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &.  =}g]  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Z"n'/S:q  
class CAboutDlg : public CDialog /pIb@:Y1?  
{ <qq'h  
 public: UC+7-y,  
  CAboutDlg(); VU`z|nBW@  
  // Dialog Data x<*IF,o  
  //{{AFX_DATA(CAboutDlg) aEEz4,x_  
  enum { IDD = IDD_ABOUTBOX }; uVq5fT`B  
  //}}AFX_DATA V3 _b!  
  // ClassWizard generated virtual function overrides Q3Z%a|3W  
  //{{AFX_VIRTUAL(CAboutDlg) ~AC P%QM=  
 protected: #7~tL23}]  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support I*:qGr+ WJ  
  //}}AFX_VIRTUAL J|"nwY}a9  
  // Implementation x?f0Hk+  
 protected: o[6vxTH  
  //{{AFX_MSG(CAboutDlg) (o*e<y,}W  
  //}}AFX_MSG vTMP&a'5L  
  DECLARE_MESSAGE_MAP() 4kaE}uKU  
}; xOV A1p b,  
o!s%h!%L  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) $d2kHT  
{ {8{t]LK<  
 //{{AFX_DATA_INIT(CAboutDlg) 8_<&f%/  
 //}}AFX_DATA_INIT esh$*)1  
} u 5Eo  
z{`6#  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;zZ,3pl-E  
{ ovQS ET18b  
 CDialog::DoDataExchange(pDX); LZUA+x(  
 //{{AFX_DATA_MAP(CAboutDlg) d DIQ+/mmg  
 //}}AFX_DATA_MAP ! v-w6WG"  
} K9C@dvFH  
4V228>9w  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) = GH@.3`X  
 //{{AFX_MSG_MAP(CAboutDlg) H]tSb//qc  
 // No message handlers N#RD:"RS!  
 //}}AFX_MSG_MAP "GwWu-GS  
END_MESSAGE_MAP() qab) 1ft  
VBbUl|X\  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %="~\1y  
: CDialog(CCaptureDlg::IDD, pParent) u>,lf\Fgz  
{ XN~#gm#  
 //{{AFX_DATA_INIT(CCaptureDlg) g{A3W) [ b  
  m_bControl = FALSE; <ELziE~>V  
  m_bAlt = FALSE; BcZEa^^~os  
  m_bShift = FALSE; 42Aje  
  m_Path = _T("c:\\"); f[JI/H>  
  m_Number = _T("0 picture captured."); d s|8lz,  
  nCount=0; ?jNF6z*M6  
  bRegistered=FALSE; w69>tC  
  bTray=FALSE; wGOMUWAt  
 //}}AFX_DATA_INIT P[rAJJN/E  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 -GDV[Bg  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); pAJ=f}",]E  
} :u >W&D  
9Eq^B9(  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) m\*&2Na  
{ r~Y>+ln.  
 CDialog::DoDataExchange(pDX); < -Hs<T|tW  
 //{{AFX_DATA_MAP(CCaptureDlg) hi;WFyJTu  
  DDX_Control(pDX, IDC_KEY, m_Key); 4NpHX+=P  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); T>\nWancQM  
  DDX_Check(pDX, IDC_ALT, m_bAlt); %PQldPL8  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); u;+%Qh  
  DDX_Text(pDX, IDC_PATH, m_Path); ?G4iOiyt  
  DDX_Text(pDX, IDC_NUMBER, m_Number); $:f.Krj  
 //}}AFX_DATA_MAP tk`: CT *  
} 84[|qB,ML  
}iPo8Ra  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Po Yr:=S?  
//{{AFX_MSG_MAP(CCaptureDlg) QO5OnYh  
 ON_WM_SYSCOMMAND() sTKab :  
 ON_WM_PAINT() ELN|;^-/|Q  
 ON_WM_QUERYDRAGICON() ^H5w41  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) V.K70)]  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ZhGh {D[,  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Nl~Z,hT$*  
//}}AFX_MSG_MAP U/.w;DI   
END_MESSAGE_MAP() !: m`9o8  
:0M' =~[  
BOOL CCaptureDlg::OnInitDialog() "2ZIoa!^  
{ u{g]gA8s  
 CDialog::OnInitDialog(); ?JuX~{{. L  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ~8jThi U  
 ASSERT(IDM_ABOUTBOX < 0xF000); **T:eI+  
 CMenu* pSysMenu = GetSystemMenu(FALSE); DapQ}2'_  
 if (pSysMenu != NULL) I`/]@BdgY  
 { dzgs%qtK  
  CString strAboutMenu; PzIy">plm  
  strAboutMenu.LoadString(IDS_ABOUTBOX); R&NpdW N  
  if (!strAboutMenu.IsEmpty()) 4|zd84g  
  { b%3Q$wIJ6  
   pSysMenu->AppendMenu(MF_SEPARATOR); ,]f),;=  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?@_v,,|  
  } rumAo'T/%  
 } - waX#U T=  
 SetIcon(m_hIcon, TRUE); // Set big icon rU; g0'4e  
 SetIcon(m_hIcon, FALSE); // Set small icon *mf}bTiS  
 m_Key.SetCurSel(0); k!Vn4?B"k  
 RegisterHotkey(); $|Q".dD  
 CMenu* pMenu=GetSystemMenu(FALSE); S#P+B*v  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ^Lsc`<xC  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ~J%R-{U9  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); L&:M8xiA~$  
 return TRUE; // return TRUE unless you set the focus to a control |2qR^Hd&5  
} @ L\-ZWq  
5XzrS-I+X@  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 'GrRuT<  
{ z8g=;><  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) btUq  
 { jVX._bEGX  
  CAboutDlg dlgAbout; s0gJ f[  
  dlgAbout.DoModal(); <Cu'!h_nL  
 } ;JAK[o8i  
 else i B%XBR  
 { dj3|f{kg{  
  CDialog::OnSysCommand(nID, lParam); &K06}[J  
 } kX igX-  
} b+W)2rFO  
ah 4kA LO  
void CCaptureDlg::OnPaint() *]FgfttES  
{ zs4>/9O  
 if (IsIconic()) P`}$-#DF  
 { Pg7>ce  
  CPaintDC dc(this); // device context for painting xy2\'kS`G  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); {V.Wk  
  // Center icon in client rectangle Z/xV\Ggx  
  int cxIcon = GetSystemMetrics(SM_CXICON); MO[c0n%  
  int cyIcon = GetSystemMetrics(SM_CYICON); /^d. &@*  
  CRect rect; AeN 3<|RN  
  GetClientRect(&rect); W5pn;u- sz  
  int x = (rect.Width() - cxIcon + 1) / 2; *:?QB8YJ  
  int y = (rect.Height() - cyIcon + 1) / 2; *f{7  
  // Draw the icon g+igxC}2z  
  dc.DrawIcon(x, y, m_hIcon); /d[Mss  
 } 7`Qde!+C  
 else >+L7k^[,0  
 { |Es0[cU  
  CDialog::OnPaint(); Ny[Q T*nV  
 } (viWY  
} =ntft SH  
j(&GVy^;?  
HCURSOR CCaptureDlg::OnQueryDragIcon() HB%K|&!+  
{ QQ*gFP.Ao  
 return (HCURSOR) m_hIcon; 6j_ 678  
} ol50d73B  
yGRR8F5>(  
void CCaptureDlg::OnCancel() j]AekI4I  
{ %yeu"  
 if(bTray) Ocybc%  
  DeleteIcon(); '[%jjUU  
  CDialog::OnCancel(); 1bd$XnU  
} dQ,Q+ON>  
CdZnD#F2  
void CCaptureDlg::OnAbout() i)=m7i  
{ X|,["Az 8  
 CAboutDlg dlg; L"4]Tm>zq  
 dlg.DoModal(); 2bkJ /u`i  
} ;r3}g"D@  
tp@*=*^I  
void CCaptureDlg::OnBrowse() ~H7!MC~K  
{ H*GlWgfG  
 CString str; w:v=se"U  
 BROWSEINFO bi; N=q#y@L  
 char name[MAX_PATH]; <o2,HTWNPS  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ti}f&w ICJ  
 bi.hwndOwner=GetSafeHwnd(); Zgy7!AF!  
 bi.pszDisplayName=name; XJc ,uj7  
 bi.lpszTitle="Select folder"; C1 tb`  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; UAdz-)$  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); |4 Qx=x>  
 if(idl==NULL) p:Oz<P  
  return; -'j7SOGk  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); eap8*ONl  
 str.ReleaseBuffer(); (nq^\ZdF  
 m_Path=str; "$r 1$mBi  
 if(str.GetAt(str.GetLength()-1)!='\\') f$vwuW  
  m_Path+="\\"; 3EI]bmi~  
 UpdateData(FALSE); S.1( 3j*  
} 7H4L-J3  
Y|_O8[  
void CCaptureDlg::SaveBmp() nX)f'[ 7  
{  >9{zQf!  
 CDC dc; pziq0  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); RB IOdz  
 CBitmap bm; lirNYJ]tO  
 int Width=GetSystemMetrics(SM_CXSCREEN); !W~QT}  
 int Height=GetSystemMetrics(SM_CYSCREEN); X{`1:c'x  
 bm.CreateCompatibleBitmap(&dc,Width,Height); zz&vfO31J  
 CDC tdc; p3 e|j  
 tdc.CreateCompatibleDC(&dc); %Uf'+!4l`  
 CBitmap*pOld=tdc.SelectObject(&bm); _H8*ReFG  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Zb"jB$58  
 tdc.SelectObject(pOld); 0iV;g`%  
 BITMAP btm; a_MFQf&KV  
 bm.GetBitmap(&btm); Ia#"/`||  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; h D.)M  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); *,0+RASvq  
 BITMAPINFOHEADER bih; nZxSMN0]  
 bih.biBitCount=btm.bmBitsPixel; &8n?  
 bih.biClrImportant=0; ?~Pv3'%d  
 bih.biClrUsed=0; Y([d;_#P  
 bih.biCompression=0; "H$@b`)  
 bih.biHeight=btm.bmHeight; F_v-}bbcFQ  
 bih.biPlanes=1; T{tn.sT  
 bih.biSize=sizeof(BITMAPINFOHEADER); *,&S',S-  
 bih.biSizeImage=size; 9n"V\e_R  
 bih.biWidth=btm.bmWidth; Kr]z]4.d@  
 bih.biXPelsPerMeter=0; kutJd{68  
 bih.biYPelsPerMeter=0; /kRAt^4!  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ^&NN]?  
 static int filecount=0; e8-ehs>  
 CString name; T<6GcI>A  
 name.Format("pict%04d.bmp",filecount++); l#$TYJi  
 name=m_Path+name; *7Xzht&f  
 BITMAPFILEHEADER bfh; z0 \N{rP&  
 bfh.bfReserved1=bfh.bfReserved2=0; gHZqA_*T8U  
 bfh.bfType=((WORD)('M'<< 8)|'B'); O:IQ!mzV5  
 bfh.bfSize=54+size; AuXs B  
 bfh.bfOffBits=54; W~yLl%  
 CFile bf; j;+["mi  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ `BjR.xMv  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Zw#<E =\  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); |mOMRP#'  
  bf.WriteHuge(lpData,size); 8SZK:VE@  
  bf.Close(); [S0mY["  
  nCount++; !D;c,{Oz  
 } KUFz:&wK  
 GlobalFreePtr(lpData); G|*G9nQ  
 if(nCount==1) 7&foEJ3q  
  m_Number.Format("%d picture captured.",nCount); xNIGO/uI~  
 else #A )Ab%r8"  
  m_Number.Format("%d pictures captured.",nCount); c]NN'9G!{  
  UpdateData(FALSE); mf9hFy* <4  
} g YUTt  
7 >bMzdH  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) +>}o;`hPe  
{ R$d7\nBG  
 if(pMsg -> message == WM_KEYDOWN) |IN[uQ  
 { 1'fb @vO  
  if(pMsg -> wParam == VK_ESCAPE) y42#n  
   return TRUE; =) }nLS3t  
  if(pMsg -> wParam == VK_RETURN) V^sc1ak1Q  
   return TRUE; P,ydt  
 } I .P6l*$  
 return CDialog::PreTranslateMessage(pMsg); NbkK&bz  
} ;A"\?i Q  
G "brT5:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >f@ G>H)+  
{ 9yL6W'B!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ `ET& VV  
  SaveBmp(); oM-[B h]A  
  return FALSE; Sc_5FX\Yx  
} `HyF_m>\  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ J^:n* C  
 CMenu pop; M4:s;@qZ.  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); l!@ 1u^v2  
 CMenu*pMenu=pop.GetSubMenu(0);  :,~K]G  
 pMenu->SetDefaultItem(ID_EXITICON); p[qg&VKB  
 CPoint pt; yWY|]Pp  
 GetCursorPos(&pt); gr+Pl>C{  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); M*`hDdS  
 if(id==ID_EXITICON) c1#+Vse  
  DeleteIcon(); 7n&yv9"  
 else if(id==ID_EXIT) p+Lv=e)0u  
  OnCancel(); 2*'ciH37  
 return FALSE; ]0-<>  
} 4Jykos2  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); QNg\4%  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) FmD +8=  
 AddIcon(); x<F$aXOS  
 return res; iRve)   
} ix*muVBj.  
tvpN/p  
void CCaptureDlg::AddIcon() FN\GE\H  
{ kOI !~Qk  
 NOTIFYICONDATA data; "dtlME{Bx  
 data.cbSize=sizeof(NOTIFYICONDATA); %/pc=i|+  
 CString tip; o;J;k_[MX  
 tip.LoadString(IDS_ICONTIP); y-a|Lu*  
 data.hIcon=GetIcon(0); E1(1E?}!  
 data.hWnd=GetSafeHwnd(); ^P$7A]!  
 strcpy(data.szTip,tip); FYl3c   
 data.uCallbackMessage=IDM_SHELL; $[z<oN_Q  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ?cK]C2Ak  
 data.uID=98; $5A^'q  
 Shell_NotifyIcon(NIM_ADD,&data); <5IQc[3]aP  
 ShowWindow(SW_HIDE); i}lRIXjdV  
 bTray=TRUE; 0*yJ %  
} [h-norB((  
kEP<[K  
void CCaptureDlg::DeleteIcon() niWx^gKb$  
{ Pm?B 9S  
 NOTIFYICONDATA data; T*+A.G@L"  
 data.cbSize=sizeof(NOTIFYICONDATA); A3q*$.[  
 data.hWnd=GetSafeHwnd(); ch })ivFP[  
 data.uID=98; >nM%p4E  
 Shell_NotifyIcon(NIM_DELETE,&data); UA(;fZ@  
 ShowWindow(SW_SHOW); 28UVDG1?  
 SetForegroundWindow(); A*i_|]Q  
 ShowWindow(SW_SHOWNORMAL); sE9Ckc5  
 bTray=FALSE; zP nC=h|g  
} h(N=V|0  
%5Rq1$D  
void CCaptureDlg::OnChange() GOVAb'  
{ ti9}*8  
 RegisterHotkey(); ;_tO+xL&  
} Gru ALx7  
c;!9\1sr  
BOOL CCaptureDlg::RegisterHotkey() 3.),bm  
{ - _t&+5]  
 UpdateData(); RL&lKHA  
 UCHAR mask=0; } 0{B  
 UCHAR key=0; +)gB9DoK  
 if(m_bControl) O-!,Jm   
  mask|=4;  `{}@@]  
 if(m_bAlt) &J(!8y*QyE  
  mask|=2; F1c&0*_A  
 if(m_bShift) =x H~ww (D  
  mask|=1; 2C1+_IL   
  key=Key_Table[m_Key.GetCurSel()]; %),!2_ x~  
 if(bRegistered){ *s\sa+2al  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); .'lN4x  
  bRegistered=FALSE; &HL{LnLP@/  
 } oD0EOT/E  
 cMask=mask; H[nz]s  
 cKey=key; 7zGMkl  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); j-32S!  
 return bRegistered; g^j7@dum  
} Funj!x'uE  
j@v-|  
  四、小结 TQ'e  
p;`N\.ld  
  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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