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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: (Lo2fY5  
  r9Z/y*q  
  一、实现方法 'MUrszOO.e  
LNZ#%R~r  
  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: K(d!0S  
?W n(ciO  
#pragma data_seg("shareddata") `aUp&8{  
HHOOK hHook =NULL; //钩子句柄 ]2(c$R  
UINT nHookCount =0; //挂接的程序数目 'm cJ/9)v  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 t4IJ%#22  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 x]ti3?w  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 6\3k0z  
static int KeyCount =0; 2jW>uk4/i  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 K*Jtyy}r  
#pragma data_seg() K8J2eV\  
88>Uu!M=f  
  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。 &XsLp&Do2  
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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: j1 F+,   
%jxuH+L   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR =b7&(x  
cKey,UCHAR cMask) BB.TrQM.#  
{ .NT&>X~.V  
 BOOL bAdded=FALSE; s.sy7%{  
 for(int index=0;index<MAX_KEY;index++){ XX-T",  
  if(hCallWnd[index]==0){ ]uvbQ.l_t  
   hCallWnd[index]=hWnd; Qm#i"jvV  
   HotKey[index]=cKey; ^I{]Um:  
   HotKeyMask[index]=cMask; {{3H\ rR  
   bAdded=TRUE; / D ]B  
   KeyCount++; `&_k\/  
   break; @(c<av?  
  } ? sW`**j  
 } V@:=}*E  
 return bAdded; ;n!X% S<z*  
} {0e{!v  
//删除热键 8uxFXQ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f^4*.~cB  
{  _)E8XyzF  
 BOOL bRemoved=FALSE; uAs*{:4n  
 for(int index=0;index<MAX_KEY;index++){ t4_K>Mj+d  
  if(hCallWnd[index]==hWnd){  vkpV,}H  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ MNqyEc""  
    hCallWnd[index]=NULL; ZPsY0IzLo  
    HotKey[index]=0; !2| `aa  
    HotKeyMask[index]=0; uS#Cb+*F  
    bRemoved=TRUE; !>y}Xq{bm3  
    KeyCount--; ,R}KcZG)  
    break; pMp9 O/u%  
   } [7 `Dgnmq  
  } :5M}Iz7  
 } R6Mxdm2P}  
 return bRemoved; 1vs>2` DLa  
} XOg(k(&T  
~cBc&u:"  
m=\eL~ h  
  DLL中的钩子函数如下: K}`p_)(  
+Z&&H'xD  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) UT<b v}(J  
{ Gd6 ;'ZCmY  
 BOOL bProcessed=FALSE; e'Us(]ZO  
 if(HC_ACTION==nCode) |ak C  
 { s<_LcQbt{  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Zmbz-##HQ  
   switch(wParam) ~wf~b zs  
   {  T 0v@mXBQ  
    case VK_MENU: ~oA9+mT5  
     MaskBits&=~ALTBIT; 11<@++,i  
     break; PnIvk]"Ab  
    case VK_CONTROL: +'j*WVE%5  
     MaskBits&=~CTRLBIT; ^xw [d}0 S  
     break; q\t>D _lU  
    case VK_SHIFT: 8^/Ek<Q b|  
     MaskBits&=~SHIFTBIT; a]Da`$T  
     break; zg Y*|{4Sl  
    default: //judge the key and send message 0/P-> n~  
     break; bC4* w O  
   } f93rY<  
   for(int index=0;index<MAX_KEY;index++){ ,cy/fW  
    if(hCallWnd[index]==NULL) AzO3(1:  
     continue; ]7S7CVDk4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $ l sRg:J  
    { Rc:cVK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); W[X!P)=w]  
     bProcessed=TRUE; 7! b)'W?  
    } wy_;+ 'Y  
   } ?sf2h:\N  
  } TQ\wHJ  
  else if((lParam&0xc000ffff)==1){ //有键按下 :KV,:13`D  
   switch(wParam) F `pyhc>1;  
   { BRU9LS  
    case VK_MENU: b8{h[YJL2  
     MaskBits|=ALTBIT; ?^48Zq6wM  
     break; \LoSUl i  
    case VK_CONTROL: G<u.+V  
     MaskBits|=CTRLBIT; O{ %A&Ui  
     break; F {*9[jY  
    case VK_SHIFT: OU.9 #|qU  
     MaskBits|=SHIFTBIT; r6`^>c  
     break; ksOANLRN  
    default: //judge the key and send message H&yFSz}6a  
     break; =Mu'+,dT  
   } U8QR*"GmT  
   for(int index=0;index<MAX_KEY;index++){ 1_j<%1{sZ  
    if(hCallWnd[index]==NULL) ^tg6JB;s  
     continue; 'tV"^KQHI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <7FP"YU  
    { 0 bPJEEd  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^{fi^lL=  
     bProcessed=TRUE; $E`i qRB  
    } 01-\:[{  
   } cGpN4|*rQ  
  } #}t 1   
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 M89-*1  
   for(int index=0;index<MAX_KEY;index++){ R(/[NvUb  
    if(hCallWnd[index]==NULL) r>Qyc  
     continue; d)hzi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -@ UN]K  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0.u9f`04  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 [!:-m61  
   } C6D=>%uY  
  } qrM{b=  
 } @ yg| OA}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); v't6 yud  
} M\y~0uZ  
1%/ NL?8#  
  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: *2"bG1`  
G&%nF4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); GLaZN4`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w8ZHk?:  
\sHy.{  
  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  tYV"  
yd0=h7s  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 75\RG+kQ  
{ <@U.   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) [$1: &!(!  
 { e_I; y  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 oRT  
  SaveBmp(); _gPVmGG  
  return FALSE; ;"d,~nLn  
 } VW{aUgajO  
 …… //其它处理及默认处理 u5cVz_S  
} nl)_`8=  
k7yv>iN  
zt)p`kdD  
  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。 BGlGpl  
Rm,[D)D^0N  
  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。 ]ZR{D7.?  
HsjELbH  
  二、编程步骤 zJnL<Q  
5T$9'5V7  
  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"; iioct_7,g<  
pPiYPfs  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; #L@} .Giz  
9atjK4+o  
  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; ]^yV`Z8  
:"OZc7 ~  
  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; mHK@(D7X  
0v_6cYA  
  5、 添加代码,编译运行程序。 njy~   
ot|N;=ZKo  
三、程序代码 Xk{!' 0  
y'J:?!S,Yu  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL iX8h2l  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) L\/u}]dPQ  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ h.4qlx|  
#if _MSC_VER > 1000 'h!h!  
#pragma once Hk<X  
#endif // _MSC_VER > 1000 + >T7Q`64  
#ifndef __AFXWIN_H__ Ij;==f~G  
#error include 'stdafx.h' before including this file for PCH itqQ)\W  
#endif ]Y_{P~ZX  
#include "resource.h" // main symbols +8LM~voB  
class CHookApp : public CWinApp ri/t(m^{W  
{ 8 *4@-3Sx  
 public: b34zhZ  
  CHookApp(); io1S9a(y  
  // Overrides >:w?qEaE  
  // ClassWizard generated virtual function overrides XAjd %Xv<  
  //{{AFX_VIRTUAL(CHookApp) y;,=a jrF  
 public: (w5u*hx  
  virtual BOOL InitInstance(); 9nT?|n]>  
  virtual int ExitInstance(); /~H[= Pf  
  //}}AFX_VIRTUAL fkdf~Vb  
  //{{AFX_MSG(CHookApp) :`:xP  
  // NOTE - the ClassWizard will add and remove member functions here. 4mEzcwo'  
  // DO NOT EDIT what you see in these blocks of generated code ! 07.nq;/R  
  //}}AFX_MSG :wQC_;  
  DECLARE_MESSAGE_MAP() ljN zYg~-  
}; R<0Fy=z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); GwgFi@itN  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2-B6IPeI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7MKD_`g  
BOOL InitHotkey(); (3e;"'k  
BOOL UnInit(); ?wGiog<Q{  
#endif J)-T:.i|0  
L@7Qs6G2u  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ]WTf< W<  
#include "stdafx.h" E"Zb};}  
#include "hook.h" ?RZq =5Um&  
#include <windowsx.h> @''&nRC1  
#ifdef _DEBUG 3CA|5A.Pa  
#define new DEBUG_NEW f&6w;T=  
#undef THIS_FILE J$1j-\KS  
static char THIS_FILE[] = __FILE__; " <<A  
#endif Xy:Gj, @  
#define MAX_KEY 100 X7e>Z)l  
#define CTRLBIT 0x04 `-~`<#E[  
#define ALTBIT 0x02 Bx+d3  
#define SHIFTBIT 0x01 }$^]dn@  
#pragma data_seg("shareddata") $8jaapNm@  
HHOOK hHook =NULL; a`DWpc~  
UINT nHookCount =0; P;j&kuW|zL  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey u@AI&[Z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT {?w"hjy  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 7*+Km'=M  
static int KeyCount =0; 7 rH'1U  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift )V=0IZi  
#pragma data_seg() _o\>V:IZ  
HINSTANCE hins; Ynvj;  
void VerifyWindow(); aPprMQ5  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $2Kau 1  
//{{AFX_MSG_MAP(CHookApp) 4S'[\ZJO  
// NOTE - the ClassWizard will add and remove mapping macros here. =.DTR5(_h  
// DO NOT EDIT what you see in these blocks of generated code! 3voW  
//}}AFX_MSG_MAP g4Y) Bz  
END_MESSAGE_MAP() ])eOa%  
<'W=]IAV  
CHookApp::CHookApp() YdK _.t0Mu  
{ +-U@0&Y3M  
 // TODO: add construction code here, w- r_H!-  
 // Place all significant initialization in InitInstance =D{B}=D\IM  
} ]y.R g{iv  
nHnk#SAA u  
CHookApp theApp; w nWgy4:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) yDzdE;  
{ ZOp^`c9~  
 BOOL bProcessed=FALSE; o\&~CW~@~  
 if(HC_ACTION==nCode) ;{Xy`{Cg!  
 { `Uv)Sf{  
  if((lParam&0xc0000000)==0xc0000000){// Key up Bw6L;Vu  
   switch(wParam) ~ eHRlXL'  
   { [ne" T  
    case VK_MENU: 9MT? .q  
     MaskBits&=~ALTBIT; 2%5?F n=  
     break; |P>|D+I0  
    case VK_CONTROL: 6nc0=~='$  
     MaskBits&=~CTRLBIT;  '6O|H  
     break; CldDr<k3  
    case VK_SHIFT: }~rcrm.   
     MaskBits&=~SHIFTBIT; Z{} n8 b*  
     break; #Gd7M3  
    default: //judge the key and send message 0D<TF>M;pn  
     break; vm|!{5l:=y  
   } Vd21,~^>g  
   for(int index=0;index<MAX_KEY;index++){ cs t&0  
    if(hCallWnd[index]==NULL) pL! a  
     continue; @^'$r&M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ALfiR(!  
    { MA$Xv`6I\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "NKf0F  
     bProcessed=TRUE; @7fm1b  
    } yQ'eu;+]  
   } *!Y- !  
  } U_l7CCK +  
  else if((lParam&0xc000ffff)==1){ //Key down BMpF02Y|4  
   switch(wParam) )%qtE34`  
   { Ge^Qar  
    case VK_MENU: e{0L%%2K  
     MaskBits|=ALTBIT; Z^*NnL.'  
     break; ]rnXNn;  
    case VK_CONTROL: H'Ln P>@n#  
     MaskBits|=CTRLBIT; gM#jA8gz  
     break; 3"Yif  
    case VK_SHIFT: (')(d HHW  
     MaskBits|=SHIFTBIT; VRF6g|0;  
     break; k1#5nYN.  
    default: //judge the key and send message Ny^'IUu  
     break; {OCJ(^8i  
   } lufeieW  
   for(int index=0;index<MAX_KEY;index++) ;%W dvnW  
   { tFiR!f)  
    if(hCallWnd[index]==NULL) 1Cv#nhmp  
     continue; T9?54r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) IC/Q  
    { /&(1JqzlB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  &{ZSE^  
     bProcessed=TRUE; ) |MJnx9  
    } DvYwCgLR  
   } 7}%H2$Do  
  } O,|\"b1(  
  if(!bProcessed){ Pw{"_g  
   for(int index=0;index<MAX_KEY;index++){ \(fq8AL?  
    if(hCallWnd[index]==NULL) Yb 6q))Y  
     continue; Ak A!:!l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 0% +'  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); MwAJ(  
   } |` "?  
  } /H)Br~ l  
 } 6,+nRiZ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); gu<V (M\  
} ertBuU  
Kt6>L5:94  
BOOL InitHotkey() u-szt ?O|  
{ j5^-.sEEw  
 if(hHook!=NULL){ 8W -@N  
  nHookCount++; [!~}S  
  return TRUE; ="'- &  
 } 6t7fa<  
 else XYAmJ   
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); h e&V# #  
  if(hHook!=NULL) ,Sg33N ?  
   nHookCount++; X#ZgS!Mn  
  return (hHook!=NULL); R ]P;sk5  
} ]?&FOzN5$P  
BOOL UnInit() v{y{sA  
{ 4pPI'd&/7  
 if(nHookCount>1){ X;!~<~@Y  
  nHookCount--; j?-R]^-5  
  return TRUE; K5`Rk" s  
 } <2<87PU  
 BOOL unhooked = UnhookWindowsHookEx(hHook); QVtM.oi!Q  
 if(unhooked==TRUE){ 9$RI H\*  
  nHookCount=0; 78]gt J  
  hHook=NULL; Im)EDTm$  
 } cp%ii'  
 return unhooked; d#>y}H9  
} :=fvZAWD  
>emcJVYV`[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <kbyZXV@K  
{ Wi$dZOcSJ  
 BOOL bAdded=FALSE; %Q~CB7ILK  
 for(int index=0;index<MAX_KEY;index++){ }ZzLs/v%X  
  if(hCallWnd[index]==0){ ]db@RbaH  
   hCallWnd[index]=hWnd; &=Y e6 f[  
   HotKey[index]=cKey; !#}7{  
   HotKeyMask[index]=cMask; wa:0X)KC?  
   bAdded=TRUE; 1*UN sEr  
   KeyCount++; 4!%F\c46  
   break; d8OL!Rk  
  } _^\$" nw  
 } v\%G|8+]  
 return bAdded; Z cpmquf8L  
} `hrQw)5?r  
b$- e\XB!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Tlodn7%",  
{ JhX=l-?  
 BOOL bRemoved=FALSE; o2uj =Gnx  
 for(int index=0;index<MAX_KEY;index++){ RU&_j* U  
  if(hCallWnd[index]==hWnd){ T ):SGW  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `ifiL   
    hCallWnd[index]=NULL; y%cO#P@  
    HotKey[index]=0; x0Z5zV9  
    HotKeyMask[index]=0;  }roG(  
    bRemoved=TRUE; e@n!x}t8  
    KeyCount--; %*W<vu>H  
    break; <Q5Le dN  
   } J4aB Pq`  
  } gEJi[E@  
 } @i%YNI5*  
 return bRemoved; M+xdHBg  
} ;3m!:l  
thW<   
void VerifyWindow() ;[$n=VX`  
{ m,_d^  
 for(int i=0;i<MAX_KEY;i++){ t"AzI8O  
  if(hCallWnd!=NULL){ HeA{3s  
   if(!IsWindow(hCallWnd)){ I021p5h|  
    hCallWnd=NULL; Q-eCHr)  
    HotKey=0; !; v~^#M]~  
    HotKeyMask=0; B'weok  
    KeyCount--; !GK$[9  
   } r\M9_s8  
  } ]v29 Rx  
 } " I+p  
} =f7r69I"  
G|u3UhyB  
BOOL CHookApp::InitInstance() P?ep]  
{ '0t-]NAc  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); b,^*mx=  
 hins=AfxGetInstanceHandle(); pa<qZZ  
 InitHotkey(); O'DW5hBL0  
 return CWinApp::InitInstance(); ^TFs;|..  
} =o=1"o[  
HOi C  
int CHookApp::ExitInstance() `a]44es9q  
{ xUWr}j4;  
 VerifyWindow(); BavO\{J#|0  
 UnInit(); Z)"61) )  
 return CWinApp::ExitInstance(); =zg:aTMti  
} E~hzh /,34  
53OJ-m%a  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file }_OM$nzj  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) #-# NqX:  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 5g ;ac~g  
#if _MSC_VER > 1000 Iy7pt~DJ,  
#pragma once %$ceJ`%1e  
#endif // _MSC_VER > 1000 8cWZ"v  
UlovXb  
class CCaptureDlg : public CDialog `,>wC+}  
{ 7C,T&g 1:  
 // Construction -X1X)0v$  
 public: ,LYFEq_  
  BOOL bTray; HgRwi It  
  BOOL bRegistered; cma*Dc  
  BOOL RegisterHotkey(); #Gf+=G  
  UCHAR cKey; ljJ>;g+  
  UCHAR cMask; eE8ULtO  
  void DeleteIcon(); \gO,hST   
  void AddIcon(); RMXzU  
  UINT nCount; }IkQA#4$  
  void SaveBmp(); *~VxC{  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor JBX[bx52<r  
  // Dialog Data a P()|js  
  //{{AFX_DATA(CCaptureDlg) xi'>mIT  
  enum { IDD = IDD_CAPTURE_DIALOG }; )NW6?Pu"  
  CComboBox m_Key; "HIXm  
  BOOL m_bControl; pa]"iZz  
  BOOL m_bAlt; !.X.tc  
  BOOL m_bShift; m}Y0xV9  
  CString m_Path; y=sGe!^  
  CString m_Number; {I1~-8  
  //}}AFX_DATA uOi&G:=  
  // ClassWizard generated virtual function overrides O>0VTW  
  //{{AFX_VIRTUAL(CCaptureDlg) 9@VO+E$7L  
 public: *,WP,-0  
  virtual BOOL PreTranslateMessage(MSG* pMsg); UVu DQ  
 protected: d]v+mVAyE  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "5|Lz)=  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ^HA %q8| n  
  //}}AFX_VIRTUAL $p* p  
  // Implementation \F6LZZ2Lv  
 protected: K`KLC.j  
  HICON m_hIcon; H#d:kilNy  
  // Generated message map functions d5j_6X  
  //{{AFX_MSG(CCaptureDlg) O}ejWP8>  
  virtual BOOL OnInitDialog(); Jobiq]|>  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); $&P?l=UG  
  afx_msg void OnPaint(); &XLD S=j  
  afx_msg HCURSOR OnQueryDragIcon(); iZ,YxN<R  
  virtual void OnCancel(); JWO=!^  
  afx_msg void OnAbout(); j . A6S`  
  afx_msg void OnBrowse(); <fO4{k*&  
  afx_msg void OnChange(); yubSj*  
 //}}AFX_MSG dj9 ?t  
 DECLARE_MESSAGE_MAP() akuJz  
}; Yxd X#3  
#endif Ss ?CfRM  
}-<zWI {p  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file !Jfs?Hy  
#include "stdafx.h" # '|'r+  
#include "Capture.h" hsLzj\)6  
#include "CaptureDlg.h" ?(zoTxD  
#include <windowsx.h> (&\aA 0-}H  
#pragma comment(lib,"hook.lib") \k8rxW  
#ifdef _DEBUG &Vk; VM`5  
#define new DEBUG_NEW ] gb=  
#undef THIS_FILE B0UJq./`  
static char THIS_FILE[] = __FILE__; u b?K,  
#endif q }C+tn"\  
#define IDM_SHELL WM_USER+1 vR7HF*8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); n]!fO 6kj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ju` [m  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Z0,~V  
class CAboutDlg : public CDialog LxN*)[Wb  
{ `cB_.&  
 public: ?:rx1}:F  
  CAboutDlg(); +{`yeZ9S  
  // Dialog Data ww d'0P`/  
  //{{AFX_DATA(CAboutDlg) -#&kYK#Ph  
  enum { IDD = IDD_ABOUTBOX }; bMoAD.}  
  //}}AFX_DATA ``Q 2P%  
  // ClassWizard generated virtual function overrides (X[2TT3j!  
  //{{AFX_VIRTUAL(CAboutDlg) y>VcgLIB  
 protected: /i|z.nNO  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support fp>.Owt%.  
  //}}AFX_VIRTUAL |PVt}*0"  
  // Implementation }qPhx6nP  
 protected: ZDLMMX x>  
  //{{AFX_MSG(CAboutDlg) USML~]G z  
  //}}AFX_MSG ),^eA  
  DECLARE_MESSAGE_MAP() OJ>.-"  
}; B\`Aojw"E?  
dG'SZ&<  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) *=F(KZ  
{ 2-If]Fc  
 //{{AFX_DATA_INIT(CAboutDlg) <|6%9@  
 //}}AFX_DATA_INIT :Waox"#=g  
} 9|r* pK[  
8s}J!/2  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 5rxA<G s  
{ 5CYo7mJ6+  
 CDialog::DoDataExchange(pDX); Y#V8(DTyH  
 //{{AFX_DATA_MAP(CAboutDlg) Sq]pQ8  
 //}}AFX_DATA_MAP i\}:hU-U  
} 0`#(Toe{B  
Xg<[fwW  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) VAQ)Hc]  
 //{{AFX_MSG_MAP(CAboutDlg) &&8'0 .M{  
 // No message handlers !-]C;9 Zd  
 //}}AFX_MSG_MAP $+= <(*  
END_MESSAGE_MAP() JyBp-ii  
TvhJVVQ+?  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) $r.U  
: CDialog(CCaptureDlg::IDD, pParent) 5OLQw(E  
{ q ojXrSb"y  
 //{{AFX_DATA_INIT(CCaptureDlg) x!TZ0fq0  
  m_bControl = FALSE; GUp;AoQ  
  m_bAlt = FALSE; }U 5Y=RYo  
  m_bShift = FALSE; 5a`%)K  
  m_Path = _T("c:\\"); _ *(bmJM  
  m_Number = _T("0 picture captured."); SOh-,c\C  
  nCount=0; ?s%v0cF  
  bRegistered=FALSE; `H%G3M0a  
  bTray=FALSE; &k>aP0k"  
 //}}AFX_DATA_INIT >=,ua u7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 x!7yU_ls`  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /="HqBI#i  
} eb:A1f4L  
mX# "+X|  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) y2Bh?>pg  
{ 3!9 Z=- tD  
 CDialog::DoDataExchange(pDX); %HuyK  
 //{{AFX_DATA_MAP(CCaptureDlg) |^n3{m  
  DDX_Control(pDX, IDC_KEY, m_Key); j+ ::y) $  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); pK_?}~  
  DDX_Check(pDX, IDC_ALT, m_bAlt); _2Py\+$  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); qt?*MyfV  
  DDX_Text(pDX, IDC_PATH, m_Path); }7/e8 O2  
  DDX_Text(pDX, IDC_NUMBER, m_Number); %CH6lY=lI  
 //}}AFX_DATA_MAP /Bv#) -5  
} v"6 \=@  
HOW7cV'X  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) fv'4f$U  
//{{AFX_MSG_MAP(CCaptureDlg) fib#CY  
 ON_WM_SYSCOMMAND() Utl t<  
 ON_WM_PAINT() >%%=0!,yX  
 ON_WM_QUERYDRAGICON() .(Y6$[#@  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) (|h:h(C  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) }uO5q42  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +&v\ /  
//}}AFX_MSG_MAP 7k8n@39?  
END_MESSAGE_MAP() )/t6" "  
|"7Pv skT  
BOOL CCaptureDlg::OnInitDialog() ,Qc.;4s-  
{ Fz"ff4Bx [  
 CDialog::OnInitDialog(); kA?_%fi1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); L:f)i,S"5q  
 ASSERT(IDM_ABOUTBOX < 0xF000); UZxmh sv  
 CMenu* pSysMenu = GetSystemMenu(FALSE); h[Tk; h  
 if (pSysMenu != NULL) 7Ua7A  
 { W4(?HTWZ  
  CString strAboutMenu; m#@_8_ M  
  strAboutMenu.LoadString(IDS_ABOUTBOX); c[(Pg%  
  if (!strAboutMenu.IsEmpty()) 3(_!`0#F%  
  { !q /5yEJ>h  
   pSysMenu->AppendMenu(MF_SEPARATOR); <4X?EYaTq  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); R,0Oq5  
  } Z5)eREi=  
 } f6ZZ}lwaV  
 SetIcon(m_hIcon, TRUE); // Set big icon l gq=GHW  
 SetIcon(m_hIcon, FALSE); // Set small icon " ~Q*XN2  
 m_Key.SetCurSel(0); 8C&x MA^  
 RegisterHotkey(); wK5_t[[  
 CMenu* pMenu=GetSystemMenu(FALSE); ExhL[1E  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);  W'/>et  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); &^QPkX@p  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9%,;XQ  
 return TRUE; // return TRUE unless you set the focus to a control L]-w;ll-  
} @p!Q1-]=  
Z7#7N wy4  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 78Y@OL_$  
{ gY5l.&  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) %J P!{mqj  
 { "sbBe73 m  
  CAboutDlg dlgAbout; >;lKLGJrd>  
  dlgAbout.DoModal(); L(o#4YH}>J  
 } 2i:zz? 'p`  
 else {8CWWfHCD  
 { [X"k> Sq  
  CDialog::OnSysCommand(nID, lParam); ;h=S7M9.  
 } 2P}I'4C-  
} rK=6]j(K  
IC~ljy]y_  
void CCaptureDlg::OnPaint() 6Z c)0I'  
{ Rt4di^v  
 if (IsIconic()) f%Ke8'&  
 {  Alu5$6X  
  CPaintDC dc(this); // device context for painting uQp_':\k  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?!S GiARW?  
  // Center icon in client rectangle &9P<qU^N)  
  int cxIcon = GetSystemMetrics(SM_CXICON); @YZ 4AC  
  int cyIcon = GetSystemMetrics(SM_CYICON); }~zO+Wf2  
  CRect rect; eV;me>,  
  GetClientRect(&rect); ]N}]d +^6  
  int x = (rect.Width() - cxIcon + 1) / 2; Bw-s6MS  
  int y = (rect.Height() - cyIcon + 1) / 2; K` (#K#n  
  // Draw the icon rO^xz7K^  
  dc.DrawIcon(x, y, m_hIcon); FdxsU DL  
 } E+{5-[Zc*$  
 else eP|)SU  
 { In(NF#  
  CDialog::OnPaint(); Z<]VTo  
 } l%PnB )F  
} P(_(w 9  
-Enbcz(B  
HCURSOR CCaptureDlg::OnQueryDragIcon() ,y.3Fe  
{ yQ-hnlzn~  
 return (HCURSOR) m_hIcon; cjT[P"5$  
} /djACA  
,"H?hFQ  
void CCaptureDlg::OnCancel() ^x3EotQ\  
{ aL)$b  
 if(bTray) 6ZgNHARS  
  DeleteIcon(); B9W/bJ6%  
  CDialog::OnCancel(); ,%8$D-4#_  
} ^pw7o6}  
ZR mPP  
void CCaptureDlg::OnAbout() .zwVCW,u  
{ N cM3P G  
 CAboutDlg dlg; =ZMF]|  
 dlg.DoModal(); ZgBckb  
}  ;MZbL)  
)0F^NU  
void CCaptureDlg::OnBrowse() O3xz|&xY&  
{ d+1x*`U|  
 CString str; enPYj.*/0  
 BROWSEINFO bi; %mmxA6I  
 char name[MAX_PATH]; D(@SnI+  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ]ut?&&*  
 bi.hwndOwner=GetSafeHwnd(); hXnw..0"  
 bi.pszDisplayName=name; wRi~Yb?  
 bi.lpszTitle="Select folder"; >3$uu+p1F  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ~Jxlj(" 0(  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 5~yQ>h  
 if(idl==NULL) QX+Y(P`vMK  
  return; !ABLd|tP  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); |rFJ*.nD  
 str.ReleaseBuffer(); )u Qvt-  
 m_Path=str; v?{vg?vI  
 if(str.GetAt(str.GetLength()-1)!='\\') 4K'|DO|dH  
  m_Path+="\\"; C=s((q*  
 UpdateData(FALSE); 2D_6  
} b<\GI 7  
R05T5Q1]A  
void CCaptureDlg::SaveBmp() `|JI\&z  
{ #'KY`&Tw&  
 CDC dc; wRj~Qv~E  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); l`qP~ k#  
 CBitmap bm; 8nf4Jk8r  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6ku8`WyoF  
 int Height=GetSystemMetrics(SM_CYSCREEN); )2toL5Q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); W n6,U=$3  
 CDC tdc; 13\Sh  
 tdc.CreateCompatibleDC(&dc); ec#_olG%  
 CBitmap*pOld=tdc.SelectObject(&bm); 63SVIc~wT  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4a1BGNI%SW  
 tdc.SelectObject(pOld); |&(H^<+Xp  
 BITMAP btm; k=FcPF"  
 bm.GetBitmap(&btm); QdirE4W  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; (w}r7`n  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); R'r|E_  
 BITMAPINFOHEADER bih; a0)vvo=bz  
 bih.biBitCount=btm.bmBitsPixel; ^Jn|*?+l  
 bih.biClrImportant=0; 4fD`M(wv  
 bih.biClrUsed=0; <w;D$l}u  
 bih.biCompression=0; Lq%[A*`^  
 bih.biHeight=btm.bmHeight; M$#+W?m&  
 bih.biPlanes=1; >*Sv0#  
 bih.biSize=sizeof(BITMAPINFOHEADER); M Ey1~h/  
 bih.biSizeImage=size; tI `w;e%HN  
 bih.biWidth=btm.bmWidth; 2"zIR (  
 bih.biXPelsPerMeter=0; rx{#+ iw  
 bih.biYPelsPerMeter=0; +OKA_b"wB  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); rT o%=0P  
 static int filecount=0; l#mtND3  
 CString name; vW9^hbdx  
 name.Format("pict%04d.bmp",filecount++); $`ON!,oa  
 name=m_Path+name; C CC4(v  
 BITMAPFILEHEADER bfh; "[Yip5  
 bfh.bfReserved1=bfh.bfReserved2=0; 7Zhli Y1  
 bfh.bfType=((WORD)('M'<< 8)|'B'); bL+sN"Km  
 bfh.bfSize=54+size; 9'D8[p%  
 bfh.bfOffBits=54; ozT._ C  
 CFile bf; Ni&,g  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ bx1G CD  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); >h|UCJ1 `  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); UnJi& ~O  
  bf.WriteHuge(lpData,size); u|(aS^H=q  
  bf.Close(); >>/nuWdpO  
  nCount++; %L.lkRs  
 } jBT*~DyN z  
 GlobalFreePtr(lpData); >qr=l,Hi  
 if(nCount==1) FLw[Mg:L  
  m_Number.Format("%d picture captured.",nCount); 9Y;}JVS  
 else AX/=}G  
  m_Number.Format("%d pictures captured.",nCount); ]eY Qio!  
  UpdateData(FALSE); jc3ExOH  
} hg(KNvl  
g]:..W7  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) R65;oJh  
{ ^XtHF|%0T  
 if(pMsg -> message == WM_KEYDOWN) $[WN[J  
 { 0^-z?Kb<}  
  if(pMsg -> wParam == VK_ESCAPE) S^*(ALFPj  
   return TRUE; FuIWiO(  
  if(pMsg -> wParam == VK_RETURN) A;K{&x  
   return TRUE; FA5k45w L  
 } QSO5 z2|  
 return CDialog::PreTranslateMessage(pMsg); hj%}GP{{  
} bfcD5:q  
h}Fu"zK  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) J+-,^8)  
{ A{xSbbDk  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ @`#OC#  
  SaveBmp(); DK2c]i^|=  
  return FALSE; <e@I1iL37y  
} jFI]54,  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ JI28}Cxs0  
 CMenu pop; qdg= Imx  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 5<0Yh#_  
 CMenu*pMenu=pop.GetSubMenu(0); zW|$x<M^  
 pMenu->SetDefaultItem(ID_EXITICON); g;| n8]  
 CPoint pt; T#ecLD#  
 GetCursorPos(&pt); vq@#Be?@  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); h9@gs,'   
 if(id==ID_EXITICON) $6qR/#74  
  DeleteIcon(); }[YcilU_  
 else if(id==ID_EXIT) LWp?U!N  
  OnCancel(); KyVe0>{_u  
 return FALSE; IFHgD}kp%#  
} J~PTVR  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); >B|ofwm*  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) J-HabHv  
 AddIcon(); 6PVlZ  
 return res; Pj^k pjV  
} Y+S~b  
U^WQWa  
void CCaptureDlg::AddIcon() ePFC$kMn  
{ GcU(:V2o  
 NOTIFYICONDATA data; tFb|y+  
 data.cbSize=sizeof(NOTIFYICONDATA); TU^tW  
 CString tip; (5CX*)R  
 tip.LoadString(IDS_ICONTIP); yDl5t-0`  
 data.hIcon=GetIcon(0); 3M5=@Fwkr  
 data.hWnd=GetSafeHwnd(); y2d_b/  
 strcpy(data.szTip,tip); vCrWA-q#  
 data.uCallbackMessage=IDM_SHELL; QQ2OZy> W  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 6Wcn(h8%*  
 data.uID=98; o F,R@f  
 Shell_NotifyIcon(NIM_ADD,&data); "@):*3 4  
 ShowWindow(SW_HIDE); I=Lj_UF4  
 bTray=TRUE; B@: XC&R^  
} )Q N=>J  
a-o hS=W  
void CCaptureDlg::DeleteIcon() k/6G j}l'o  
{ ,& {5,=  
 NOTIFYICONDATA data; 4%Wn}@  
 data.cbSize=sizeof(NOTIFYICONDATA); *PA1iNdKS  
 data.hWnd=GetSafeHwnd(); =h1 QN  
 data.uID=98; 2T{-J!k  
 Shell_NotifyIcon(NIM_DELETE,&data); ^Ypb"Wx8  
 ShowWindow(SW_SHOW); ui:>eYv  
 SetForegroundWindow(); R _~m\P  
 ShowWindow(SW_SHOWNORMAL); +RKE|*y  
 bTray=FALSE; #6#BSZ E  
} Qc)RrqYNGF  
VA*79I#_q  
void CCaptureDlg::OnChange() _<&K]e@dp  
{ 1]zyME  
 RegisterHotkey(); oBGstt@  
} jTxChR  
m$G?e 9{  
BOOL CCaptureDlg::RegisterHotkey() W.7d{ @n  
{ "!4>gg3r  
 UpdateData(); T3PaG\5B  
 UCHAR mask=0; e&VR>VJEA  
 UCHAR key=0; V-o`L`(F`  
 if(m_bControl) <]SS gQ9/"  
  mask|=4; vo^9qSX f  
 if(m_bAlt) jL[Is2<@  
  mask|=2; 4N^Qd3[d  
 if(m_bShift) JCMEhI6d*  
  mask|=1; /A`zy  
  key=Key_Table[m_Key.GetCurSel()]; 4wEpyQ|L  
 if(bRegistered){ 8;dbU*  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); z]4g`K+  
  bRegistered=FALSE; A0 w `o  
 } =M km:'1r  
 cMask=mask; 3qd-,qC  
 cKey=key; F(kRAe;  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); kJ5?BdvM&  
 return bRegistered; lr= !:D=K  
} 3[g++B."pC  
uvc{RP  
  四、小结 dJ"xW; "  
!B38! L  
  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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