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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: j z58E}  
  6Htg5o|W  
  一、实现方法 F# T 07<  
\;u@"  
  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: qt%D'  
v[e:qi&fG  
#pragma data_seg("shareddata") )B,|@ynu  
HHOOK hHook =NULL; //钩子句柄 Z[__"^}  
UINT nHookCount =0; //挂接的程序数目 91>fqe  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 U-/{0zB  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 o]:3H8  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Ig]iT  
static int KeyCount =0;  Jc&y9]  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 lKZB?Kk^w\  
#pragma data_seg() s, k  
\.YS%"Vz  
  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。 )WT>@  
%1}K""/  
  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: '52~$z#m  
w }Uhd ,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR o*U]v   
cKey,UCHAR cMask) !l]dR@e  
{ Wjhvxk  
 BOOL bAdded=FALSE; &nBa=Enf  
 for(int index=0;index<MAX_KEY;index++){ AdRX`[ik  
  if(hCallWnd[index]==0){ <\kr1qH H  
   hCallWnd[index]=hWnd; iu&wO<)+?  
   HotKey[index]=cKey; [ i#zP  
   HotKeyMask[index]=cMask; >SPh2[f  
   bAdded=TRUE; ~ .;<  Bj  
   KeyCount++; ;JZS^Wa  
   break; y E[#ze  
  } J+d1&Tw&  
 } ok|qyN+  
 return bAdded; Z R/#V7Pj  
} fd-q3 _f  
//删除热键 y6]vl=^L  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z~`b\A,$  
{ zg-2C>(6a  
 BOOL bRemoved=FALSE; jck}" N  
 for(int index=0;index<MAX_KEY;index++){ p-.n3AL  
  if(hCallWnd[index]==hWnd){ !uQPc   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ( Jz;W<E  
    hCallWnd[index]=NULL; pPd#N'\*  
    HotKey[index]=0; 9]q:[zm^  
    HotKeyMask[index]=0; yR(x+ Gs{]  
    bRemoved=TRUE; T)r9-wOq  
    KeyCount--;  Yn8=  
    break; Q0EiEX)  
   } ~ vqa7~}m  
  } >jD[X5Y  
 } 4Y[1aQ(%  
 return bRemoved; (}}S9 K  
} cM&{+el  
E[Cb|E  
EkziAON  
  DLL中的钩子函数如下: jH_JmYd  
$56,$K`H  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) xyI}y(CN1  
{ r Tz$^a}/  
 BOOL bProcessed=FALSE; b0oMs=uBn  
 if(HC_ACTION==nCode) 'C"9QfK  
 { /Q~i~B 2j-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 D 9M:^  
   switch(wParam) s6>ZREf#J  
   {  @')[FEdW  
    case VK_MENU: 9-MUX^?u  
     MaskBits&=~ALTBIT; 8<Hf" M  
     break; 5LOo8xN  
    case VK_CONTROL: _4g.j  
     MaskBits&=~CTRLBIT; eUg~)m5G  
     break; 1dK*y'rx  
    case VK_SHIFT: -Z's@'*  
     MaskBits&=~SHIFTBIT; =Q\r?(Iy  
     break; D*lKn62  
    default: //judge the key and send message K5lmVF\$P  
     break; EY tQw(!Q  
   } f k&8]tK4  
   for(int index=0;index<MAX_KEY;index++){ 1')%`~  
    if(hCallWnd[index]==NULL) '3g[]M@M  
     continue; "s{5O>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) WYr/oRO  
    { BqT y~{)+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); r(P(Rj2~  
     bProcessed=TRUE; lv04g} W  
    } @Z12CrJ  
   } d@qsdYu-*  
  } *6VF $/rP  
  else if((lParam&0xc000ffff)==1){ //有键按下 fZoHf\B]{  
   switch(wParam) Oeok ;:  
   { `^)jLuyu  
    case VK_MENU: /HaHH.e  
     MaskBits|=ALTBIT; v d[0X;  
     break; 4M2j!Sw  
    case VK_CONTROL: Ig f&l`\  
     MaskBits|=CTRLBIT; RN e^; B  
     break; 76`8=!]R  
    case VK_SHIFT: .4E&/w+  
     MaskBits|=SHIFTBIT; .nVa[B |.  
     break; BBev<  
    default: //judge the key and send message -X"p:=;j  
     break; }R{ts  
   } -[wGX}}  
   for(int index=0;index<MAX_KEY;index++){ aJ>65RJ^=  
    if(hCallWnd[index]==NULL) lz?$f4TzA  
     continue; S Em Q@1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) | AozR ~  
    { h%uZYsK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2%_vXo=I  
     bProcessed=TRUE; WHj'dodS  
    } 2I,^YWR  
   } 9J2NH|]c  
  } ++^l]8  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 B&n<M]7  
   for(int index=0;index<MAX_KEY;index++){ ]jo1{IcI  
    if(hCallWnd[index]==NULL) !*7 vFl  
     continue; )84~ugs  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) l`f/4vy  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); I+tb[*X+  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 NeE t  
   } q-}Fvel u  
  } lIW }EM  
 } xwq+j "  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); =ACVE;L?  
} 24z< gO  
$}!p+$  
  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: zN^n]N_?  
?B2] -+Y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Gz,i~XX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {?:X8&Sf  
4b98Ks Yg  
  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: $\X[@E S0  
~?K~L~f5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0.8  2kl  
{ )-a'{W/t  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) &E.^jR~*  
 { ewctkI$,5  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 tFp Ygff<  
  SaveBmp(); s~5[![1 K  
  return FALSE; x-^`~ p  
 } XovRg,  
 …… //其它处理及默认处理 YS/Yd[ e  
} nU7>uU  
v>Q #B  
\1D<!k\S  
  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。 ~a ]+#D  
x|pg"v&[  
  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。 _({hc+9p  
{xXsBh Y  
  二、编程步骤 >n'o*gZM  
%C| n9*  
  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"; '"SEw w  
S[PE$tYT#t  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; DtXrWS/  
VY |_d k  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; t*Sa@$p  
3G}x;Cp\D  
  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; 1g8_Xe4  
nn@-W]  
  5、 添加代码,编译运行程序。 "_-Po^u=r  
L^@'q6*}  
三、程序代码 oX30VfT  
5z7U1:  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL \LR~r%(rM  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) &"&Z #llb  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ QdF5Cwf4  
#if _MSC_VER > 1000 >=:&D)m"  
#pragma once ILEz;D{]   
#endif // _MSC_VER > 1000 2$+bJJM  
#ifndef __AFXWIN_H__ WW4vn|0v  
#error include 'stdafx.h' before including this file for PCH v%+:/m1  
#endif hT`J1nNt  
#include "resource.h" // main symbols O}-jCW;K  
class CHookApp : public CWinApp zzTfYf)  
{ &Sw%<N*r  
 public: u0|8Tgf  
  CHookApp(); IzikDc10  
  // Overrides )dbB =OZ  
  // ClassWizard generated virtual function overrides a{^m-fSaR"  
  //{{AFX_VIRTUAL(CHookApp) mF*2#]%dx  
 public: 0D\#Pq v  
  virtual BOOL InitInstance(); }X)&zenz  
  virtual int ExitInstance(); I,>- tGK  
  //}}AFX_VIRTUAL e:fy#,HEj{  
  //{{AFX_MSG(CHookApp) xS4w5i2  
  // NOTE - the ClassWizard will add and remove member functions here. SUCM b8  
  // DO NOT EDIT what you see in these blocks of generated code ! n.!#P|  
  //}}AFX_MSG RYQ<Zr$!  
  DECLARE_MESSAGE_MAP() #@YPic"n7`  
}; b=yx7v"r  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ]O+Ma}dxz:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uki#/GzaO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +ga k#M"n\  
BOOL InitHotkey(); ,k )w6)  
BOOL UnInit(); U}yW<#$+  
#endif T!+5[  
b6nsg|&#  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. } ()5"QB  
#include "stdafx.h" y"bByd|6  
#include "hook.h" n0r+A^]  
#include <windowsx.h> gd%NkxmW  
#ifdef _DEBUG q)X$^oE!6  
#define new DEBUG_NEW OK[T3/v,  
#undef THIS_FILE Uzz'.K(Mv|  
static char THIS_FILE[] = __FILE__; rI= v  
#endif be]bZ 1f  
#define MAX_KEY 100 & ?h#Z!  
#define CTRLBIT 0x04 s.bc>E0  
#define ALTBIT 0x02 27 ]':A4_  
#define SHIFTBIT 0x01 t3*wjQ3  
#pragma data_seg("shareddata") =mS\i663  
HHOOK hHook =NULL; nKPYOY8^  
UINT nHookCount =0; )97SnCkal  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey `eE&5.   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT hn5h\M?  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Zn&, t &z  
static int KeyCount =0; Sg&UagBj  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift HePUWL'  
#pragma data_seg() >80;8\  
HINSTANCE hins; HW3 }uP\c  
void VerifyWindow(); B~]k#Ot)  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Aydm2!l1  
//{{AFX_MSG_MAP(CHookApp) )Xk0VDNp$/  
// NOTE - the ClassWizard will add and remove mapping macros here. 7C,&*Ax,9  
// DO NOT EDIT what you see in these blocks of generated code! 6IBgt!=,  
//}}AFX_MSG_MAP Yw4n-0g  
END_MESSAGE_MAP() $7O}S.x  
fol,xMc&  
CHookApp::CHookApp() tNO-e|~'  
{ \Jx04[=  
 // TODO: add construction code here, KK&rb~  
 // Place all significant initialization in InitInstance Aw}"gpL  
} X iS1\*  
G,?hp>lj  
CHookApp theApp; h].<t&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "$#xK|t  
{ ;YA(|h<  
 BOOL bProcessed=FALSE; Dd'm U  
 if(HC_ACTION==nCode) >.Chl$)<  
 { E(O74/2c8  
  if((lParam&0xc0000000)==0xc0000000){// Key up $bW3_rl%X  
   switch(wParam) L^E[J`  
   { _,p/l&<  
    case VK_MENU: F~T]u2qt  
     MaskBits&=~ALTBIT; YPU*@l>  
     break; SX<` {x&L  
    case VK_CONTROL: iP =V8g?L  
     MaskBits&=~CTRLBIT; d74d/l1*{  
     break; 8$")%_1]  
    case VK_SHIFT: 9!6f-K  
     MaskBits&=~SHIFTBIT; ]JCvyz H  
     break; zz+$=(T:M  
    default: //judge the key and send message KC/=TSSXd.  
     break; (\\eo  
   } r[2ILe  
   for(int index=0;index<MAX_KEY;index++){ }Ga\wV  
    if(hCallWnd[index]==NULL) ?3nR  
     continue; CnpV:>V=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *!q1Kr6r  
    { bSiYHRH.e  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #r#1JtT  
     bProcessed=TRUE;  O{QA  
    } d;zai]]  
   } `P@T$bC  
  } G/b^|;41  
  else if((lParam&0xc000ffff)==1){ //Key down wG~`[>y (  
   switch(wParam) 3vuivU.3  
   { p2ogn}`  
    case VK_MENU: GC>e26\:  
     MaskBits|=ALTBIT; e5*ni/P  
     break; d6'{rje(  
    case VK_CONTROL: c9HrMgW  
     MaskBits|=CTRLBIT; n!NS(. o  
     break; <oR a3Gi(%  
    case VK_SHIFT: KV]X@7`@  
     MaskBits|=SHIFTBIT; &,}j #3<  
     break; 5"CZh.J  
    default: //judge the key and send message igIRSN}h  
     break; kw#;w=\>R{  
   } U}6B*Xx'  
   for(int index=0;index<MAX_KEY;index++) 6ys &zy  
   { 4A8;tU$&  
    if(hCallWnd[index]==NULL) ?%O(mC]u&  
     continue; '?!zG{x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~k!j+>yT  
    { !ipR$ dM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \?Z{hmN  
     bProcessed=TRUE; |uX,5Q#6  
    } lt ^GvWg  
   } T^Y([23  
  } [h^2Y&Au5  
  if(!bProcessed){ ySx>L uY#3  
   for(int index=0;index<MAX_KEY;index++){ |%J{RA  
    if(hCallWnd[index]==NULL) 4[.oPK=i  
     continue; j"}*T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) aNScF  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /.3}aj;6  
   } RZHd9v$  
  } 2[Z,J%:0  
 } '9S8}q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7Nk!1s :  
} Ka[t75~;  
xC{qV,   
BOOL InitHotkey() uehDIl0\[b  
{ ,5|&A  
 if(hHook!=NULL){ **$LR<L  
  nHookCount++; Gcdd3W`O  
  return TRUE; .}q&5v  
 } 6HZ`.o:f  
 else |_] Q$q[[%  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 8kU! 8^mH  
  if(hHook!=NULL) G+%zn|  
   nHookCount++; M@`;JjtSA  
  return (hHook!=NULL); I$<<(VWH  
} ;g@4|Ro  
BOOL UnInit() T?x[C4wf+  
{ =osv3>&q  
 if(nHookCount>1){ &7`^i.fh)  
  nHookCount--; YpH&<$x:  
  return TRUE; SSPHhAeH8  
 } A Y*e@nk\  
 BOOL unhooked = UnhookWindowsHookEx(hHook); eCqHvMp  
 if(unhooked==TRUE){ XiL~TCkx4  
  nHookCount=0; $"FQj4%d  
  hHook=NULL; jBgP$g  
 } @ o3T  
 return unhooked; =<{np  
} )+[ gd/<C.  
P0W*C6&71|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *pSQU=dmS  
{ [3(7  4  
 BOOL bAdded=FALSE; v3aYc:C  
 for(int index=0;index<MAX_KEY;index++){ `-(|>5wWS  
  if(hCallWnd[index]==0){ =T(6#"  
   hCallWnd[index]=hWnd; N>XS=2tzN  
   HotKey[index]=cKey; $}) g?Q  
   HotKeyMask[index]=cMask; r[BVvX/,F  
   bAdded=TRUE; l8I /0`_  
   KeyCount++;  swK-/$#  
   break; F({HP)9b  
  } Fh`~`eog  
 } /W>iJfx  
 return bAdded; }% `.h"  
} #~7ip\Uf[  
Bwa'`+bC  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) KVn []@#  
{ PcA2/!a  
 BOOL bRemoved=FALSE; )TVFtI=,NN  
 for(int index=0;index<MAX_KEY;index++){ mS~o?q-n  
  if(hCallWnd[index]==hWnd){ *v9 2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d/BM&r  
    hCallWnd[index]=NULL; SZ,YS 4M  
    HotKey[index]=0; JT3-AAi[Z  
    HotKeyMask[index]=0; ^>i63Yc  
    bRemoved=TRUE; K_RjX>q%N  
    KeyCount--; +89*)pk   
    break; 1guJG_;z  
   } | N[<x@  
  } t5y;CxL  
 } NWMFtT  
 return bRemoved; [R=yF ~-  
} 3~uW I%I`  
x4E7X_  
void VerifyWindow() ldiD2 Q  
{ Fs9I7~L3  
 for(int i=0;i<MAX_KEY;i++){ "uaMk}[ <!  
  if(hCallWnd!=NULL){ lfqiyYFm  
   if(!IsWindow(hCallWnd)){ t m7^yn:  
    hCallWnd=NULL; 9~p[  
    HotKey=0; c(!6^qk]!`  
    HotKeyMask=0; ]ooIr Y8  
    KeyCount--; !HnXXVW  
   } nQ5n-A&["  
  } A-ZN F4  
 } 7UdM  
} U<DZ:ds ?T  
Cj{1H([-  
BOOL CHookApp::InitInstance() }+C2I  
{ H@%GSE  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Uk^B"y_  
 hins=AfxGetInstanceHandle(); wVEm:/;z&  
 InitHotkey(); AaWs}M  
 return CWinApp::InitInstance(); ioYGZ%RG#  
} !bN*\c  
PE5R7)~A  
int CHookApp::ExitInstance() +RyjF~  
{ VXR>]HUF  
 VerifyWindow(); "#{4d),r  
 UnInit(); CF?1R  
 return CWinApp::ExitInstance(); (O.d>  
} v7iuL6jl  
&e#~<Wm82  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Jl#%uU/sx  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) vb<oi&X  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Y8-86 *zC  
#if _MSC_VER > 1000 KG|n  
#pragma once LR".pH13  
#endif // _MSC_VER > 1000 nV-mPyfL8  
^,/RO5  
class CCaptureDlg : public CDialog PIdikA  
{ ? 4q4J8j  
 // Construction ;[=8B \?  
 public: Bq D'8zLD  
  BOOL bTray; Rb%8)t x  
  BOOL bRegistered; +^=8ge}  
  BOOL RegisterHotkey(); VQ7*Z5[1  
  UCHAR cKey; B9NWW6S  
  UCHAR cMask; 19E 8'@  
  void DeleteIcon(); tt0f-:#  
  void AddIcon(); apg=-^L'  
  UINT nCount; HY&aV2|A1  
  void SaveBmp(); A8uVK5  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor M%2+y5  
  // Dialog Data mLP.t%?#   
  //{{AFX_DATA(CCaptureDlg) y5 *Z 3"<  
  enum { IDD = IDD_CAPTURE_DIALOG }; =a@j=  
  CComboBox m_Key; x{n`^;Y1  
  BOOL m_bControl; = kJ,%\E`  
  BOOL m_bAlt; C71qPb|$R  
  BOOL m_bShift; E4|jOz^j4\  
  CString m_Path; _B/ dWA,P  
  CString m_Number; >z%&xgOa  
  //}}AFX_DATA ]n_ k`  
  // ClassWizard generated virtual function overrides GO` Ru 8  
  //{{AFX_VIRTUAL(CCaptureDlg) >8WP0 Qx/  
 public: ]:4*L  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Ju96#v+:  
 protected: ]rWgSID  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S|7!{}  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); WvBc#s-  
  //}}AFX_VIRTUAL zNxW'?0Z?  
  // Implementation c:<005\Bg  
 protected: WST8SEzJ  
  HICON m_hIcon; Jk7|{W\OA  
  // Generated message map functions JBE!j-F  
  //{{AFX_MSG(CCaptureDlg) M>~Drul  
  virtual BOOL OnInitDialog(); `$,GzS(  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Ta(Y:*Ri  
  afx_msg void OnPaint(); [d(U38BI  
  afx_msg HCURSOR OnQueryDragIcon(); nbm&wa[  
  virtual void OnCancel(); 1FlX'[vh  
  afx_msg void OnAbout(); U+:m4a  
  afx_msg void OnBrowse(); _+K_5IO4  
  afx_msg void OnChange(); \m(VdE  
 //}}AFX_MSG K{|p~B  
 DECLARE_MESSAGE_MAP() 2R;}y7{  
}; @D{KdyW  
#endif $c]fPt"i  
D^l%{IG   
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $8 UUzk  
#include "stdafx.h" ]P.'>4  
#include "Capture.h" :=u?Fqqws  
#include "CaptureDlg.h" /?@3.3sl_  
#include <windowsx.h> pGJ>O/%  
#pragma comment(lib,"hook.lib") uE%r/:!k4$  
#ifdef _DEBUG i~I%D%;  
#define new DEBUG_NEW 2NC.Z;  
#undef THIS_FILE bCo7*<I4  
static char THIS_FILE[] = __FILE__; fZ0M%f  
#endif (.D~0a JU  
#define IDM_SHELL WM_USER+1 Si8pzd  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }uJu>'1[G  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *5%d XixN  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; =Je[c,&j$?  
class CAboutDlg : public CDialog tnH2sHby  
{ Al}6q{E9+8  
 public: `UD/}j@  
  CAboutDlg(); /|tJ6T1LrB  
  // Dialog Data AK'[c+2[  
  //{{AFX_DATA(CAboutDlg) W-mQjJ`,B  
  enum { IDD = IDD_ABOUTBOX }; B:'J `M"N  
  //}}AFX_DATA 41`n1:-]  
  // ClassWizard generated virtual function overrides ZCmgs4W!  
  //{{AFX_VIRTUAL(CAboutDlg) LAB=Vp1y3[  
 protected: ,?>s>bHV  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support X:HacYqtC  
  //}}AFX_VIRTUAL >/l? g5{  
  // Implementation i,>khc  
 protected: hIy~B['  
  //{{AFX_MSG(CAboutDlg) B"h#C!E  
  //}}AFX_MSG @ [:ZS+1  
  DECLARE_MESSAGE_MAP() 7HIeJ  
}; vB.E3r=  
^2Fei.?T.  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 2bJQTk_S  
{ &]`(v}`]  
 //{{AFX_DATA_INIT(CAboutDlg) ''yB5#^w(  
 //}}AFX_DATA_INIT r_ I5. gK  
} r[|Xy>Zj  
',9V|jvK  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) gG0!C))8  
{ BXtCSfY $  
 CDialog::DoDataExchange(pDX); 4Jp:x"w  
 //{{AFX_DATA_MAP(CAboutDlg) K"|l@Q[  
 //}}AFX_DATA_MAP A)bWcB}U  
} i3tg6o4C  
GeyvId03H  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) aI P  
 //{{AFX_MSG_MAP(CAboutDlg) EMY/~bQW  
 // No message handlers idLWe9gC  
 //}}AFX_MSG_MAP .nrMfl_  
END_MESSAGE_MAP() -`'I{g&A  
e7 ^mmm  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~xkeuU  
: CDialog(CCaptureDlg::IDD, pParent) )eUh=eW  
{ S0zD"T  
 //{{AFX_DATA_INIT(CCaptureDlg) ^uKwB;@  
  m_bControl = FALSE; |Luqoa  
  m_bAlt = FALSE; 3@kf@ Vf  
  m_bShift = FALSE; ~ksi</s  
  m_Path = _T("c:\\"); KaPAa:Q  
  m_Number = _T("0 picture captured."); cz >V8  
  nCount=0; /)YNs7gR  
  bRegistered=FALSE; 8<X#f !  
  bTray=FALSE; B,?T%  
 //}}AFX_DATA_INIT %KsEB*' "  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 m8A#~i .  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `7c~m ypx  
} % Qmn-uZ  
;D3C >7y  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) e|)hG8FlF  
{ CyJEY-  
 CDialog::DoDataExchange(pDX); 95ZyP!  
 //{{AFX_DATA_MAP(CCaptureDlg) T$>WE= Y  
  DDX_Control(pDX, IDC_KEY, m_Key); 9]k @Q_  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); h}[-'>{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); e%svrJ2   
  DDX_Check(pDX, IDC_SHIFT, m_bShift); \nXtH}9ZF  
  DDX_Text(pDX, IDC_PATH, m_Path); =$u! 59_dE  
  DDX_Text(pDX, IDC_NUMBER, m_Number); <CS(c|7  
 //}}AFX_DATA_MAP l{5IUuUi  
} "sS}N%!  
T. }1/S"m  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) I3a NFa}  
//{{AFX_MSG_MAP(CCaptureDlg) 6/5YjO|a  
 ON_WM_SYSCOMMAND() F0GxH?  
 ON_WM_PAINT() ,c;Kzp>e  
 ON_WM_QUERYDRAGICON() H3z: ZTI  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) {x|[p_?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 8m-U){r!U^  
 ON_BN_CLICKED(ID_CHANGE, OnChange) \HqNAE2T  
//}}AFX_MSG_MAP *w|:~g  
END_MESSAGE_MAP() SEo'(-5  
tI`Q/a5@  
BOOL CCaptureDlg::OnInitDialog() BBaQ}{F8>2  
{ APvDP?  
 CDialog::OnInitDialog(); o*-)Tq8GHE  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); U_M$#i{_  
 ASSERT(IDM_ABOUTBOX < 0xF000); '}9x\3E  
 CMenu* pSysMenu = GetSystemMenu(FALSE); hpHr\g  
 if (pSysMenu != NULL) {:Orn%Q  
 { ( Z619w  
  CString strAboutMenu; Yrb{ByO&  
  strAboutMenu.LoadString(IDS_ABOUTBOX); C].iCxn  
  if (!strAboutMenu.IsEmpty()) 3DzMB?I  
  { 1#C4;3i,  
   pSysMenu->AppendMenu(MF_SEPARATOR); b,5~b&<h  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); .8@$\ZRP  
  } (jnQ -  
 } YJ^] u}  
 SetIcon(m_hIcon, TRUE); // Set big icon bn#"?6Z2  
 SetIcon(m_hIcon, FALSE); // Set small icon Bn^0^J-  
 m_Key.SetCurSel(0); TITKj?*o  
 RegisterHotkey(); L9r8BK;  
 CMenu* pMenu=GetSystemMenu(FALSE); J*r*X.  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ?Y$JWEPJ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ?iw!OoZ`  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); P 0SQr?W  
 return TRUE; // return TRUE unless you set the focus to a control \MA+f~)9  
} ^ UciW  
C;;Sih5  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) c?tBi9'Y]  
{ q_Q/3rh  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) )mg:_K  
 { 69PE9zz  
  CAboutDlg dlgAbout; |N4.u _hM  
  dlgAbout.DoModal(); U\ ig:  
 } S ^"y4- 2  
 else )SaGH3~*C  
 { ?ME6+Z\  
  CDialog::OnSysCommand(nID, lParam); [glLre^  
 } 35A|BD) q  
} ?8I?'\F;  
Us)Z^s  
void CCaptureDlg::OnPaint() 8LyD7P 1\  
{ R] vV*  
 if (IsIconic()) KxI&G%z  
 { ; ^*}#X d  
  CPaintDC dc(this); // device context for painting y0{u<"t%w  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); iNWw;_|1  
  // Center icon in client rectangle :yL] ;J  
  int cxIcon = GetSystemMetrics(SM_CXICON); ed]=\Key  
  int cyIcon = GetSystemMetrics(SM_CYICON); i@C].X  
  CRect rect; ]}Mj)J"m  
  GetClientRect(&rect); US+Q~GTA  
  int x = (rect.Width() - cxIcon + 1) / 2; .?D7dyU l1  
  int y = (rect.Height() - cyIcon + 1) / 2; `n.5f[wC  
  // Draw the icon ^?-:'<4q$  
  dc.DrawIcon(x, y, m_hIcon); rxVanDb=W  
 } "LHcB]^<  
 else mf A{3  
 { tGD6AI1"I  
  CDialog::OnPaint(); i{Uc6 R6  
 } &Q%zl9g(g  
} yd^ {tQi  
+ @A  
HCURSOR CCaptureDlg::OnQueryDragIcon() Rvkedb  
{ ^T( .k=  
 return (HCURSOR) m_hIcon; 7G:s2432  
} AhCW'.  
g9m-TkNk  
void CCaptureDlg::OnCancel() 10G}{  
{ h(<,fg1  
 if(bTray) /vY(o1o x  
  DeleteIcon(); _- [''(E  
  CDialog::OnCancel(); o906/5M  
} bH-ub2@qO  
P#E&|n7DT  
void CCaptureDlg::OnAbout() Yab%/z2:  
{ _A M*@|p,  
 CAboutDlg dlg; {i1| R"ta  
 dlg.DoModal(); IrR7"`.i  
} GSY(  
QEm|])V  
void CCaptureDlg::OnBrowse() d)"3K6s|5  
{ 6~0$Z-);(  
 CString str; Z_PNI#h*  
 BROWSEINFO bi; 4qN{n#{+]  
 char name[MAX_PATH]; Rh3eLt~|(  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); [=x[ w70  
 bi.hwndOwner=GetSafeHwnd(); Jz?j[  
 bi.pszDisplayName=name; ;5wn67'  
 bi.lpszTitle="Select folder"; v:EB*3n5  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; :Gv1?M  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~fBtQGdX  
 if(idl==NULL) w:??h4lt  
  return; qBU-~"2t  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); hMzs*gK  
 str.ReleaseBuffer(); x* DarSk  
 m_Path=str; 7@#>b E6  
 if(str.GetAt(str.GetLength()-1)!='\\') h&|[eZt?F  
  m_Path+="\\"; HvUxsdT  
 UpdateData(FALSE); ylUrLQ\  
} .v]IJfRH*  
Hh%I0#  
void CCaptureDlg::SaveBmp() Jx_cf9{  
{ 9lTv   
 CDC dc; lackB2J9 A  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ?42<J%p  
 CBitmap bm; zuP B6W^  
 int Width=GetSystemMetrics(SM_CXSCREEN); KMt`XaC9e  
 int Height=GetSystemMetrics(SM_CYSCREEN); B6=ebM`q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); +~St !QV%  
 CDC tdc; 2:*w~|6>}5  
 tdc.CreateCompatibleDC(&dc); [l:x'_y  
 CBitmap*pOld=tdc.SelectObject(&bm); y9_V  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); m9)p-1y@5  
 tdc.SelectObject(pOld); 6f;fx}y  
 BITMAP btm; OHv[#xGuV?  
 bm.GetBitmap(&btm); 1ofKt=|=  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; |o,YCzy|5  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); SD#]$v  
 BITMAPINFOHEADER bih; M])ZK  
 bih.biBitCount=btm.bmBitsPixel; 909?_ v  
 bih.biClrImportant=0; 6.FY0.i  
 bih.biClrUsed=0; ?8HHA: GP  
 bih.biCompression=0; "-y-iJ  
 bih.biHeight=btm.bmHeight; < |e,05aM  
 bih.biPlanes=1; U T>s 5C  
 bih.biSize=sizeof(BITMAPINFOHEADER); T _M!<J  
 bih.biSizeImage=size; JgG$?n\  
 bih.biWidth=btm.bmWidth; .R`5 Qds*l  
 bih.biXPelsPerMeter=0; )js)2L~  
 bih.biYPelsPerMeter=0; 2`.cK 3  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); hS_6  
 static int filecount=0; L%">iQOG#  
 CString name; P<oehw'>  
 name.Format("pict%04d.bmp",filecount++); :Y-{Kn6`_  
 name=m_Path+name; }p=Jm)y  
 BITMAPFILEHEADER bfh; 2Fy>.*,?  
 bfh.bfReserved1=bfh.bfReserved2=0; Wi>!{.}%A  
 bfh.bfType=((WORD)('M'<< 8)|'B'); H /,gro  
 bfh.bfSize=54+size; z|fmrwkN'$  
 bfh.bfOffBits=54; })uGRvz  
 CFile bf; ;sfb 4x4  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ $J4 *U  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); DvME 1]7)  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ~0?mBy!-O  
  bf.WriteHuge(lpData,size); Xsa2(-  
  bf.Close(); aF8fqu\  
  nCount++; jNu9KlN  
 } Yaj0;Lo[wt  
 GlobalFreePtr(lpData); INUG*JC6  
 if(nCount==1) =b38(\  
  m_Number.Format("%d picture captured.",nCount); U0=]  
 else U93}-){m  
  m_Number.Format("%d pictures captured.",nCount); ygOd69  
  UpdateData(FALSE); l;af~ef)'  
} Ok>gh2e[c  
'"y|p+=j:  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) o5xAav"+>  
{ `))\}C@k  
 if(pMsg -> message == WM_KEYDOWN)  R=.4  
 { S2n39 3  
  if(pMsg -> wParam == VK_ESCAPE) yPM3a7-Bm  
   return TRUE; ]FD'5p{  
  if(pMsg -> wParam == VK_RETURN) t'9*R7=  
   return TRUE; =,%CLS,6w  
 } $4-$pL6"  
 return CDialog::PreTranslateMessage(pMsg); I[b}4M6E  
} >tTj[cMJl  
-r#X~2tPzD  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^?$WVB  
{ 0- ><q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ (Lo%9HZ1Mx  
  SaveBmp(); b:=TB0Fx?n  
  return FALSE; ANvRi+ _  
} b k|m4|  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ qL5{f(U4<  
 CMenu pop; Jm|+-F@I  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); A"`foI$0  
 CMenu*pMenu=pop.GetSubMenu(0); %cCs?ic  
 pMenu->SetDefaultItem(ID_EXITICON); =PUt&`1.a  
 CPoint pt; j lp:lX  
 GetCursorPos(&pt); /V=24\1Ky  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 6}75iIKi  
 if(id==ID_EXITICON) > *@y8u*  
  DeleteIcon(); $=5=NuX  
 else if(id==ID_EXIT) BQBeo&n6  
  OnCancel(); RE}?5XHb  
 return FALSE; : m)   
} 1?)Xp|O  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); bB }$'  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) A; 5n:Sd  
 AddIcon(); ,B08i o-  
 return res; SaC d0. h  
} 7uT:b!^f[  
76>7=#m0u'  
void CCaptureDlg::AddIcon() [v$0[IuY,  
{ #BJG9DFP4`  
 NOTIFYICONDATA data; p>vn7;s2#  
 data.cbSize=sizeof(NOTIFYICONDATA); I96C i2)m  
 CString tip; mK[)mC _8  
 tip.LoadString(IDS_ICONTIP); Qhs/E`k4  
 data.hIcon=GetIcon(0); I6j$X6u  
 data.hWnd=GetSafeHwnd(); ,QC{3i~  
 strcpy(data.szTip,tip); XGJj3-eW {  
 data.uCallbackMessage=IDM_SHELL; 3k|oK'l  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; cUqke+!  
 data.uID=98; H_EB1"C;\  
 Shell_NotifyIcon(NIM_ADD,&data);  |?Frj  
 ShowWindow(SW_HIDE); ( xXGSx  
 bTray=TRUE; 0ge$ p,  
} *\(r+>*x*  
-6Oz^  
void CCaptureDlg::DeleteIcon() 6&DX] [G  
{ i O/K nH  
 NOTIFYICONDATA data; 9Rn? :B~W:  
 data.cbSize=sizeof(NOTIFYICONDATA); {n/uh0>f*  
 data.hWnd=GetSafeHwnd(); ; l&4V  
 data.uID=98; I/M_p^  
 Shell_NotifyIcon(NIM_DELETE,&data); so)"4 SEu  
 ShowWindow(SW_SHOW); jx.[#6e  
 SetForegroundWindow(); MS>t_C(  
 ShowWindow(SW_SHOWNORMAL); rSxxH]-  
 bTray=FALSE; ^ "i l}8`  
} @o#!EfZyE  
N>Eqj>G  
void CCaptureDlg::OnChange() `(v='$6}  
{ O=v#{ [  
 RegisterHotkey(); -od!J\ KCy  
} fbWFLS m;  
L f"i !  
BOOL CCaptureDlg::RegisterHotkey() y;t6sM@  
{ @[#$J0q q  
 UpdateData(); s <   
 UCHAR mask=0; W?0 lV5/  
 UCHAR key=0; YoN*:jB<M  
 if(m_bControl) bV edFm  
  mask|=4; P~s$EJL*  
 if(m_bAlt) U7!.,kR-  
  mask|=2; !O.[PH(,*  
 if(m_bShift) -RO7 'm0  
  mask|=1; r|PFw6  
  key=Key_Table[m_Key.GetCurSel()]; /&CmO>^e  
 if(bRegistered){ d)@<W1;  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); YY&l?*M<  
  bRegistered=FALSE; S-7'it!1  
 } h G gx  
 cMask=mask; 0dA7pY9  
 cKey=key; oY1';&BO9  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); OkCQ?]  
 return bRegistered; 4l!@=qwn  
} %honO@$  
q(zJ%Gv)  
  四、小结  %VzKqh  
fLSXPvm  
  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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