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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: f 0/q{*  
  ` b)i;m  
  一、实现方法 LD;! s  
m.yt?`  
  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: U@".XIDQ  
5N#Sic M  
#pragma data_seg("shareddata") ur+\!y7^R  
HHOOK hHook =NULL; //钩子句柄 xn<x/e  
UINT nHookCount =0; //挂接的程序数目 "6WE6zq   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 o3:h!(#G  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 }vX 1@n7T6  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey x qj@T^y  
static int KeyCount =0; E**Hu9  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 UotLJa  
#pragma data_seg() T\TKgO=)  
aslb^  
  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。 ~kZ? e1H  
a^)@ }4  
  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: ZGS4P0$  
y#J8Yv8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 70A* !v  
cKey,UCHAR cMask) &A&2z l %#  
{ nsXyReWka  
 BOOL bAdded=FALSE; 7!g4`@!5M  
 for(int index=0;index<MAX_KEY;index++){ h(FFG%H(  
  if(hCallWnd[index]==0){ :w9s bW  
   hCallWnd[index]=hWnd; %Xl(wvd   
   HotKey[index]=cKey; <OGXKv@  
   HotKeyMask[index]=cMask; ^}Gu'!z9D  
   bAdded=TRUE; AYoLpes  
   KeyCount++; A{wSO./3  
   break; %xwtG:IKEV  
  } NvJ}|w,Z  
 } \x~},!l  
 return bAdded; Z7=k$e  
} 26-K:"  
//删除热键 bSk)GZyH\d  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $G#)D^-5G  
{ M~*o =t  
 BOOL bRemoved=FALSE; Y#oY'S .;y  
 for(int index=0;index<MAX_KEY;index++){ wN$u^]  
  if(hCallWnd[index]==hWnd){ NU%W9jQYS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4u]>$?X1_  
    hCallWnd[index]=NULL; jGKI|v4U(  
    HotKey[index]=0; ;<s0~B#9}  
    HotKeyMask[index]=0; g$9s} \6B  
    bRemoved=TRUE; KiMEd373-  
    KeyCount--; cD9axlJ  
    break; =\x(Rs3  
   } 8'VcaU7Nh  
  } x|A{|oFC  
 } /~_,p,:aP  
 return bRemoved; pa6-3c  
} %g=SkQ&d  
?&$BQK  
$w ,^q+  
  DLL中的钩子函数如下: j%Z%_{6Ds*  
S!.H _=z%p  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <izn B8@  
{ oz?pE[[tm  
 BOOL bProcessed=FALSE; W< :7z  
 if(HC_ACTION==nCode) 4w(#`'I>  
 { YjwC8#$  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 [UYE.$Y#(  
   switch(wParam) P(~vqo>!  
   {  3W"l}.&ZJ"  
    case VK_MENU: )\fLS d  
     MaskBits&=~ALTBIT; 76 RFu@k  
     break; vUgMfy&  
    case VK_CONTROL: rI;tMNs  
     MaskBits&=~CTRLBIT; 0I"r*;9?K  
     break; Cc>+OUL  
    case VK_SHIFT: Tj,1]_`=V$  
     MaskBits&=~SHIFTBIT; &265 B_'D  
     break; N Uo   
    default: //judge the key and send message SR*KZ1U  
     break; U|)CZcM  
   } _Rm1-,3  
   for(int index=0;index<MAX_KEY;index++){ GGkU$qp2~  
    if(hCallWnd[index]==NULL) {K>}eO:K  
     continue; ^mCKRWOP'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) S3.76&  
    { "/qm,$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &WoS(^  
     bProcessed=TRUE; >):^Zs  
    } #Bi8>S  
   } gP:H_nVh  
  } qfl#ki`,  
  else if((lParam&0xc000ffff)==1){ //有键按下 `w#p8vR  
   switch(wParam) 31k2X81;a  
   { Tt\G y  
    case VK_MENU: (|.rEaTA[1  
     MaskBits|=ALTBIT; oS Apa  
     break; <t"|wYAa_  
    case VK_CONTROL: IO}53zn<l  
     MaskBits|=CTRLBIT; wJu,N(U  
     break; vC>8:3Z aq  
    case VK_SHIFT: OVa38Aucr3  
     MaskBits|=SHIFTBIT; !OL[1_-4|K  
     break; qC ku q  
    default: //judge the key and send message ud:5_*  
     break; qB8R4wCf  
   } N Obw/9JO  
   for(int index=0;index<MAX_KEY;index++){ DRuG5|{I:  
    if(hCallWnd[index]==NULL) YK6zN>M}E  
     continue; XX[CTh?O%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7dtkylW  
    { s2t9+ZA+s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Uy5G,!  
     bProcessed=TRUE; #jd&f,Tt  
    } Y]])Tq;h5  
   } ]c~W$h+F  
  } IAzi:ct  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 (hFyp}jkk  
   for(int index=0;index<MAX_KEY;index++){ b&\f 8xZ  
    if(hCallWnd[index]==NULL) R gTrj  
     continue; )H| cri~D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) mq6TwM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); kYnp$8  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ;X)b=  
   } s?~lMm' !  
  } ]x:>!y  
 } 3T84f[CFJ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); br4?_,  
} 1XPYI  
~1.B fOR8  
  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: \_8.\o"@*#  
9U]j@*QN  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c@Q&i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cyPJ( &;  
UNJAfr P  
  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: "#G`F  
jSd[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) q!4eVg*  
{ ;\(X;kQi  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) dBNx2T}_0  
 { / lDei}  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 RAB'%CY4  
  SaveBmp(); p4^&G/'  
  return FALSE; `Y_G*b.Rm  
 } 8Ai\T_l  
 …… //其它处理及默认处理 7-A/2/G<  
} nR`)kORc  
>vKOG@I  
#b wGDF  
  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。 #$ooV1E  
gnN"6r1  
  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。  rBUWzpE"  
z=yE- I{  
  二、编程步骤 FL E3LH  
k keDt+^  
  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"; +sT S1t  
ToX--w4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Yaj}_M-  
= :BTv[lv  
  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; Z]08gH  
PnZC I!Mw  
  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; 1\ Gxk&  
\[&&4CN{  
  5、 添加代码,编译运行程序。 ,)M/mG?,  
@UQ421Z`  
三、程序代码 ]\m >N]P]  
G.3yuok9  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Q)Q1a;o  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) d<Dm(   
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ #\Zr$?t|V  
#if _MSC_VER > 1000 vEw8<<cgg  
#pragma once (\UpJlW  
#endif // _MSC_VER > 1000 6u>]-K5  
#ifndef __AFXWIN_H__ se=;vp]3a  
#error include 'stdafx.h' before including this file for PCH Xm3r)Bm'3  
#endif (7Ln~J*  
#include "resource.h" // main symbols pGd@%/]AO  
class CHookApp : public CWinApp Zm*qV!  
{ ,ygUy]  
 public: "h-ZwL  
  CHookApp(); _p^$.\k"  
  // Overrides Jq?Fi'2F%  
  // ClassWizard generated virtual function overrides L%jIU<?Z7  
  //{{AFX_VIRTUAL(CHookApp) hBi/lHu'  
 public: {5]c \_.  
  virtual BOOL InitInstance();  0*E_D  
  virtual int ExitInstance(); "!ks7:}v  
  //}}AFX_VIRTUAL q_cP<2`@V  
  //{{AFX_MSG(CHookApp) .$fSWlM;  
  // NOTE - the ClassWizard will add and remove member functions here. {2k]$|  
  // DO NOT EDIT what you see in these blocks of generated code ! //'&a-%$^  
  //}}AFX_MSG +xd@un[r<  
  DECLARE_MESSAGE_MAP() 'xLXj>  
}; RsYMw3)G  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); S)?N6sz%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E0AbVa.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); vXm'ARj  
BOOL InitHotkey(); 7=/iFv[  
BOOL UnInit(); /cT6X]o8  
#endif ZUkM8M$c  
}U'  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. -^3uQa<zN^  
#include "stdafx.h" @C%6Wo4l3  
#include "hook.h" U(Tl$#Bt  
#include <windowsx.h> )-0+O=v  
#ifdef _DEBUG 0SQrz$y  
#define new DEBUG_NEW pHXs+Ysw+  
#undef THIS_FILE P\WFm   
static char THIS_FILE[] = __FILE__; <HtGp6q  
#endif =R<92v  
#define MAX_KEY 100 }2 Tq[rl~s  
#define CTRLBIT 0x04 z'*"iaX<c  
#define ALTBIT 0x02 W1521:  
#define SHIFTBIT 0x01 $01csj  
#pragma data_seg("shareddata") &u~Pp=kv  
HHOOK hHook =NULL; y)"rh/;  
UINT nHookCount =0; #0PZa$kM(o  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey aIDv~#l  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT \~g,;>%7Y  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey r.lHlHl  
static int KeyCount =0; AOJ[/YpM  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift KY}H-  
#pragma data_seg() ltlo$`PR  
HINSTANCE hins; hw.>HT|.N  
void VerifyWindow(); bYoBJ #UX  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8 /%{xB^  
//{{AFX_MSG_MAP(CHookApp) :dpwr9)  
// NOTE - the ClassWizard will add and remove mapping macros here. !FDd5CS  
// DO NOT EDIT what you see in these blocks of generated code! I,<?Kv  
//}}AFX_MSG_MAP =Z{jc  
END_MESSAGE_MAP() ?J,,RK.  
F{.\i*$  
CHookApp::CHookApp() ANNVE},  
{ vw4b@v-XQ3  
 // TODO: add construction code here, /!MVpi'6&  
 // Place all significant initialization in InitInstance #4JLWg  
} 8d2\H*a9~  
]-9w'K d  
CHookApp theApp; |j81?4<)v  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) MB7*AA;  
{ -Lu&bVt<>  
 BOOL bProcessed=FALSE; R}cNhZC  
 if(HC_ACTION==nCode) ec`re+1r  
 { +*Z'oCBJ,  
  if((lParam&0xc0000000)==0xc0000000){// Key up h!v< J  
   switch(wParam) ]Vmo >  
   { gO)":!_n W  
    case VK_MENU: )$1>6C\  
     MaskBits&=~ALTBIT; DIw_"$'At  
     break; .#-F@0a  
    case VK_CONTROL: 46pR!k  
     MaskBits&=~CTRLBIT; !\[JWN@v  
     break; r~2hTie  
    case VK_SHIFT: X9NP,6  
     MaskBits&=~SHIFTBIT; N'WC!K.e  
     break; wMj #.Jh  
    default: //judge the key and send message 8Y.9%@  
     break; S1I.l">P  
   } yi*EobP  
   for(int index=0;index<MAX_KEY;index++){ amdgb,vh  
    if(hCallWnd[index]==NULL) } c k <R  
     continue; ruGeN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M;,$ )>P  
    { ]gg(Z!|iQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (wM` LE(Ks  
     bProcessed=TRUE; b0YEIV<$  
    } :)D7_[i  
   } DJ@n$G`^^  
  } q[C?1Kc .z  
  else if((lParam&0xc000ffff)==1){ //Key down 9O:l0 l  
   switch(wParam) x(vQ %JC  
   { 5K2K'ZkI  
    case VK_MENU: Hcwfe=K&/  
     MaskBits|=ALTBIT; E "}@SaB-  
     break; g+4y^x(X@1  
    case VK_CONTROL: fO&`A:JY  
     MaskBits|=CTRLBIT; WA"~6U*  
     break; (nt`8 0  
    case VK_SHIFT: I](a 5i  
     MaskBits|=SHIFTBIT; C[G+SA1&W  
     break; |Rz.Pt6  
    default: //judge the key and send message DegbjqZ#  
     break; / De~K+w7o  
   } .= ?*Wp  
   for(int index=0;index<MAX_KEY;index++) cO*g4VL"[  
   { z&tC5]#  
    if(hCallWnd[index]==NULL) * l1*zaE  
     continue; %:d7Ts&?Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #aU!f"SS  
    { *H/3xPh,*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); G:":CX"O(  
     bProcessed=TRUE; 5EcVW|(  
    } UGI<V!  
   } wCB*v<*  
  } v={{ $=/t  
  if(!bProcessed){ KDq="=q  
   for(int index=0;index<MAX_KEY;index++){ o~IAZU39  
    if(hCallWnd[index]==NULL) ~qrSHn}+PU  
     continue; e))L&s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 3@Mh* \;\b  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); X!ruQem /  
   } jRg gj`o  
  } &Y=0 0  
 } )6C+0b*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 'UIFP#GtFO  
} 0bDc 4m  
Iz09O:ER  
BOOL InitHotkey() w3(|A> s3  
{ b4e~Z  
 if(hHook!=NULL){ 05 q760I+  
  nHookCount++; 4SJ aAeIZ  
  return TRUE; {,Q )D$i  
 } N3|:MMl  
 else lx%c&~.DiB  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); i D IY|  
  if(hHook!=NULL) I?3b}#&V9  
   nHookCount++; KFd +7C9  
  return (hHook!=NULL); 7Ed0BJTa  
} 112 WryS  
BOOL UnInit() qjP~F  
{ n[iwi   
 if(nHookCount>1){ ^?`fN'!p  
  nHookCount--; Swhz\/u9  
  return TRUE; 9j>2C  
 } vn^O m-\  
 BOOL unhooked = UnhookWindowsHookEx(hHook); G<$:[ +w  
 if(unhooked==TRUE){ SKL4U5D{  
  nHookCount=0; DWt|lO  
  hHook=NULL; x|rc[e%k  
 } ZL6HD n!  
 return unhooked; .n]"vpWm[  
} d&FXndC4F  
/grTOf&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !E 5FU *s  
{ 4^L;]v,|7  
 BOOL bAdded=FALSE;  TUcFx_  
 for(int index=0;index<MAX_KEY;index++){ "/Qz?1>l+  
  if(hCallWnd[index]==0){ M%S7cIX ]F  
   hCallWnd[index]=hWnd; ?'MkaG0g  
   HotKey[index]=cKey; o72r `2  
   HotKeyMask[index]=cMask; *(OG+OkC  
   bAdded=TRUE; o8g7wM]M  
   KeyCount++; 6!m#;8 4  
   break; ; j!dbT~5  
  }  ##rkyd  
 } ka9@7IFM  
 return bAdded; u5oM;#{@-  
} zr.\7\v  
%GhI0F #  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >3uNh:|>/  
{ |U|>YA1[b  
 BOOL bRemoved=FALSE; 8Sr'  
 for(int index=0;index<MAX_KEY;index++){ o9eOp3w30  
  if(hCallWnd[index]==hWnd){ )UKX\nD"0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 9eMle?pF  
    hCallWnd[index]=NULL; }(nT(9|  
    HotKey[index]=0; BDI|z/~&  
    HotKeyMask[index]=0; zXY8:+f  
    bRemoved=TRUE; A(FnU:  
    KeyCount--; f$C{Z9_SX  
    break; B)JMughq_  
   } JQ03om--(  
  } :wC\IwG~CE  
 } :0J`4  
 return bRemoved;  >(Y CZ  
} <YaTr9%w  
a{nR:zPE  
void VerifyWindow() >yC=@Uq+  
{ cpdESc9W  
 for(int i=0;i<MAX_KEY;i++){ !Km[Qw k-  
  if(hCallWnd!=NULL){  q+L'h8  
   if(!IsWindow(hCallWnd)){ )5}<@Ql  
    hCallWnd=NULL; N p"p*O  
    HotKey=0; YYe G9yR  
    HotKeyMask=0; E-z5mX.2  
    KeyCount--; Vu$m1,/  
   } bk0>f   
  } pa>C}jk}6  
 } 53i]Q;k[  
} h:aa^a~y i  
b@Oq}^a&o  
BOOL CHookApp::InitInstance() "-Q+!byh  
{ N'`X:7fN  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); xuioU  
 hins=AfxGetInstanceHandle(); cC/h7o dY  
 InitHotkey(); sINQ?4_8T  
 return CWinApp::InitInstance(); -<#) ]um  
} NM3;l}Y8  
F 3|^b{'zO  
int CHookApp::ExitInstance() 4aXIRu%#7  
{ _**Nlp*%  
 VerifyWindow(); 8 lggGt  
 UnInit(); ,2M}qs"P7G  
 return CWinApp::ExitInstance(); gm9*z.S\'  
} 0kE[=#'.'  
F&B\ X  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file kXz ~ez 7  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) CHgip&(.F  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ U{2xgN J  
#if _MSC_VER > 1000 i~';1 .g  
#pragma once f'*-<sSr  
#endif // _MSC_VER > 1000 !&:=sA  
m}"Hm(,6  
class CCaptureDlg : public CDialog c*IrZm  
{ Pq /5Dy  
 // Construction (0 T!- hsP  
 public: \L Q+ n+  
  BOOL bTray; _C !i(z!d  
  BOOL bRegistered; @DysM~I  
  BOOL RegisterHotkey(); :q9!  
  UCHAR cKey; ~i.*fL_Y  
  UCHAR cMask; <],{at` v  
  void DeleteIcon(); H>TO8;5(  
  void AddIcon(); @](vFb  
  UINT nCount; JK/{Ik F  
  void SaveBmp(); N~)-\T:ap  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Y1PR?c Q  
  // Dialog Data N5?bflY  
  //{{AFX_DATA(CCaptureDlg) <%)vl P#@  
  enum { IDD = IDD_CAPTURE_DIALOG }; y7HFmGM  
  CComboBox m_Key; (y9KO56.V&  
  BOOL m_bControl; M$K%e  
  BOOL m_bAlt; 3TwjC:Yhv2  
  BOOL m_bShift; tMl y*E  
  CString m_Path; x9l7|G/$  
  CString m_Number; #UM,)bH  
  //}}AFX_DATA qDdO-fPev  
  // ClassWizard generated virtual function overrides Tz,-~mc  
  //{{AFX_VIRTUAL(CCaptureDlg) 63fYX"  
 public: Ud/>oaW?s  
  virtual BOOL PreTranslateMessage(MSG* pMsg); a{8a[z  
 protected: |1@O>GG  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support j,YrM?Xdo  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); tT]@yo|?e/  
  //}}AFX_VIRTUAL 6"-$WUlg  
  // Implementation nb_/1{F  
 protected: BE?]P?r?  
  HICON m_hIcon; pCKP{c=6Q  
  // Generated message map functions /2K"Mpf8  
  //{{AFX_MSG(CCaptureDlg) K6v~!iiK$  
  virtual BOOL OnInitDialog(); I5"wa:Z  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); LHY7_"u#  
  afx_msg void OnPaint(); $?GggP d  
  afx_msg HCURSOR OnQueryDragIcon(); SEgw!2H  
  virtual void OnCancel(); h#0n2o#  
  afx_msg void OnAbout(); ;$D,w  
  afx_msg void OnBrowse(); iK}p#"si  
  afx_msg void OnChange(); KsULQJ#,  
 //}}AFX_MSG C*Q7@+&  
 DECLARE_MESSAGE_MAP() :C5w5 Vnj  
}; !Rv ;~f/2  
#endif 5IU!BQU  
//@6w;P  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 0+\725DJ  
#include "stdafx.h" gPMR,TU  
#include "Capture.h" 88?bUA3]  
#include "CaptureDlg.h" #BRIp(65-6  
#include <windowsx.h> O=Su E/q  
#pragma comment(lib,"hook.lib") <'\Nv._2a  
#ifdef _DEBUG P'~`2W0sz  
#define new DEBUG_NEW f`qy~M&  
#undef THIS_FILE  u$?!  
static char THIS_FILE[] = __FILE__; fN2Sio:  
#endif dgVGP_~  
#define IDM_SHELL WM_USER+1 3Zp<#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bm#5bhX\|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); TuwP'g[  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Fyvo;1a  
class CAboutDlg : public CDialog Cmx<>7fN  
{ vP{i+s18B  
 public: S?v/diK ]J  
  CAboutDlg(); 75\ZD-{T:  
  // Dialog Data 9R=avfI  
  //{{AFX_DATA(CAboutDlg) \S h/<z  
  enum { IDD = IDD_ABOUTBOX }; <EC"E #p  
  //}}AFX_DATA aImzK/  
  // ClassWizard generated virtual function overrides >Tf}aI+  
  //{{AFX_VIRTUAL(CAboutDlg) G 2`YZ\  
 protected: H&s`Xr  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~gX1n9_n  
  //}}AFX_VIRTUAL uyX % &r  
  // Implementation ?8 }pZ_j  
 protected: aR2N,<Cp5  
  //{{AFX_MSG(CAboutDlg) x}2nn)fdZ  
  //}}AFX_MSG I[E 6N2  
  DECLARE_MESSAGE_MAP() b`e_}^,c  
}; Ug*B[q/  
 ~&~4{  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) c|<F8 n  
{ hNc8uV{r=  
 //{{AFX_DATA_INIT(CAboutDlg) CVO_F=;  
 //}}AFX_DATA_INIT xa`xHh{0  
} jt oS{B,  
[P}Bq6;p  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) RxP~%oADw  
{ 4 QQt 0u0  
 CDialog::DoDataExchange(pDX); vU%o5y:  
 //{{AFX_DATA_MAP(CAboutDlg) 7nPg2K&  
 //}}AFX_DATA_MAP 59nRk}^$se  
} ]*NYuEgc  
i&DbZ=n2  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 72$S'O%,0  
 //{{AFX_MSG_MAP(CAboutDlg) 1V,@uY)s  
 // No message handlers fDr$Wcd~  
 //}}AFX_MSG_MAP '6zZ`Ll9  
END_MESSAGE_MAP() r (m3"Xu6O  
XU7to]'K  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) wai3g-`  
: CDialog(CCaptureDlg::IDD, pParent) TX5??o  
{ &wi+)d  
 //{{AFX_DATA_INIT(CCaptureDlg) /US%s  
  m_bControl = FALSE; &_3#W.w~Z  
  m_bAlt = FALSE; ; 8[VCU:  
  m_bShift = FALSE; QYH#WrIVx  
  m_Path = _T("c:\\"); pnu?=.O  
  m_Number = _T("0 picture captured."); N:|``n>  
  nCount=0; \(LD<-a  
  bRegistered=FALSE; fDYTupKXH  
  bTray=FALSE; ]D nAW'm  
 //}}AFX_DATA_INIT O#.YTTj  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 =?|$}vDO[  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); pbKmFweq  
} QP~["%}T  
bEF2- FO  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Qw_uwQZ)  
{ >!5RY8+  
 CDialog::DoDataExchange(pDX); @Yt394gA%\  
 //{{AFX_DATA_MAP(CCaptureDlg) bR3Crz(9G  
  DDX_Control(pDX, IDC_KEY, m_Key); L%H\|>k`  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); MO0t  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ((Av3{05H&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ta95]|z"j  
  DDX_Text(pDX, IDC_PATH, m_Path); 8i$|j~M a  
  DDX_Text(pDX, IDC_NUMBER, m_Number); l!gX-U%-  
 //}}AFX_DATA_MAP g]j&F65D  
} ~AWn 1vFc  
`BZ|[ q3  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) << =cZ.HP  
//{{AFX_MSG_MAP(CCaptureDlg) hXFT(J=  
 ON_WM_SYSCOMMAND() xjBY6Ylz  
 ON_WM_PAINT() KsGW@Ho:  
 ON_WM_QUERYDRAGICON() OM.-apzC  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) b B#QIXY/L  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) G#Bm">+  
 ON_BN_CLICKED(ID_CHANGE, OnChange) :Y Ls]JI<  
//}}AFX_MSG_MAP , $!F,c  
END_MESSAGE_MAP() -e$ T}3IV  
Qz=e'H  
BOOL CCaptureDlg::OnInitDialog() 4wv0~T$;x  
{ X:t?'41m\  
 CDialog::OnInitDialog(); P7>\j*U91{  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Tf=1p1!3  
 ASSERT(IDM_ABOUTBOX < 0xF000); ku/vV+&O  
 CMenu* pSysMenu = GetSystemMenu(FALSE); mm_)=Ipj>  
 if (pSysMenu != NULL) XRV~yBIS  
 { ,fiV xnQ  
  CString strAboutMenu; qJ5b;=  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?o)?N8U  
  if (!strAboutMenu.IsEmpty()) uj)vh  
  { Iep_,o.Sk  
   pSysMenu->AppendMenu(MF_SEPARATOR); DN%JT[7  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); aAqM)T83  
  } }#tbK 2[  
 } dB~A4pZa  
 SetIcon(m_hIcon, TRUE); // Set big icon ;^JMX4[  
 SetIcon(m_hIcon, FALSE); // Set small icon 3\ ]j4*i!  
 m_Key.SetCurSel(0); k@9hth2Q  
 RegisterHotkey(); A1;'S<a  
 CMenu* pMenu=GetSystemMenu(FALSE); 7%$3`4i`O  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); x _kT Wq  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Z;NaIJiL-  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Eve,*ATI  
 return TRUE; // return TRUE unless you set the focus to a control yOD=Vc7i  
} zA?AX1%Wa  
3u t<o-  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^f N/  
{ zk1]?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Z Uj1vf6I  
 { \0Xq&CG=E  
  CAboutDlg dlgAbout; #'@@P6o5  
  dlgAbout.DoModal(); 2f{p$YIt  
 } ]w,|WZm  
 else vH}VieU  
 { 5GPrZY"  
  CDialog::OnSysCommand(nID, lParam); 6Ik v}q_j  
 } hVyeHbx  
} ``]NB=N}{1  
ltrti.&  
void CCaptureDlg::OnPaint() ts@w9|  
{ \PZ;y=]p}  
 if (IsIconic()) e34g=]"  
 { pub?%  
  CPaintDC dc(this); // device context for painting +BM[@?"hrh  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); b7+(g [O  
  // Center icon in client rectangle Bx)!I]gi_  
  int cxIcon = GetSystemMetrics(SM_CXICON); ;y7+Q  
  int cyIcon = GetSystemMetrics(SM_CYICON); J@i9)D_  
  CRect rect; "PS ) "t  
  GetClientRect(&rect); 5{!"}  
  int x = (rect.Width() - cxIcon + 1) / 2; YHY*dk*|C  
  int y = (rect.Height() - cyIcon + 1) / 2; jq#`cay!  
  // Draw the icon DGTE#?'(  
  dc.DrawIcon(x, y, m_hIcon); 7'8G,|&:*  
 } 74NL)|M  
 else ./zzuKO8XK  
 { L)<~0GcP  
  CDialog::OnPaint(); M%$ITE  
 } h'GOO(  
} uwi.Sg11  
4Q1R:Ra  
HCURSOR CCaptureDlg::OnQueryDragIcon() , ExY.'%1  
{ E:uTjXt  
 return (HCURSOR) m_hIcon; yW*,Llb5  
} vV=rBO0a?  
[5!{>L`  
void CCaptureDlg::OnCancel() pKLNBR|  
{ N_FjEZpX  
 if(bTray) =b"{*Heuw  
  DeleteIcon(); J0f!+]~G3  
  CDialog::OnCancel(); =eS?`|  
} 0dsL%G~/N  
RH7!3ye  
void CCaptureDlg::OnAbout() zFDtC-GF  
{ u^i3@JuX  
 CAboutDlg dlg; . qf~t/o  
 dlg.DoModal(); <Mj{pN3  
} Z;tWV%F5  
~$//4kES  
void CCaptureDlg::OnBrowse() S|KUh|=Q  
{ SY:ISzB}  
 CString str; }Q\+w,pJgN  
 BROWSEINFO bi; ;gAL_/_  
 char name[MAX_PATH]; B7Zi|-F  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); +~:OUR*>  
 bi.hwndOwner=GetSafeHwnd(); CRiqY_gBf  
 bi.pszDisplayName=name; e\-,e+  
 bi.lpszTitle="Select folder"; AuM}L&`i^  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; C%ZPWOc_8  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <Voct  
 if(idl==NULL) WuI$   
  return; A5\ Hq  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); n _x+xVi%  
 str.ReleaseBuffer(); MO| Dwuaf  
 m_Path=str; CbxWK#aMmB  
 if(str.GetAt(str.GetLength()-1)!='\\') _KT'W!7  
  m_Path+="\\"; ~e)"!r  
 UpdateData(FALSE); Y]`o-dV  
} tnBCO%uG  
Lr d-  
void CCaptureDlg::SaveBmp() II=!E  
{ X f;R'a,$  
 CDC dc; k}qCkm27  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); sk:B; .z  
 CBitmap bm; v>mK~0.$  
 int Width=GetSystemMetrics(SM_CXSCREEN); u"wWekB  
 int Height=GetSystemMetrics(SM_CYSCREEN); t.\Pn4  
 bm.CreateCompatibleBitmap(&dc,Width,Height); eR`Q7]j] -  
 CDC tdc; 48 0M|^  
 tdc.CreateCompatibleDC(&dc); amX1idHo^  
 CBitmap*pOld=tdc.SelectObject(&bm); %2B1E( r%M  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); /2*Bd E[yG  
 tdc.SelectObject(pOld); |TQ4:P1T  
 BITMAP btm; =\MAz[IDj  
 bm.GetBitmap(&btm); mQSn*;9\T3  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; )%kiM<})  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); d0Ubt  
 BITMAPINFOHEADER bih; M} ri>o  
 bih.biBitCount=btm.bmBitsPixel; ly_8p63-  
 bih.biClrImportant=0; A>mk0P)~Q  
 bih.biClrUsed=0; Akws I@@  
 bih.biCompression=0; k!bJ&} Q(b  
 bih.biHeight=btm.bmHeight; 35x]'  
 bih.biPlanes=1;  n0EW U,1  
 bih.biSize=sizeof(BITMAPINFOHEADER); DSq?|H  
 bih.biSizeImage=size; @,2,(=l*C  
 bih.biWidth=btm.bmWidth; *5hbD-a:  
 bih.biXPelsPerMeter=0; Jp^#G2  
 bih.biYPelsPerMeter=0; ~6O~Fth  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?1O` Rd{tn  
 static int filecount=0; BG.sHI{  
 CString name; EDh-pK  
 name.Format("pict%04d.bmp",filecount++); 9HPwl  
 name=m_Path+name; LCzeE7x  
 BITMAPFILEHEADER bfh; %.'oY%  
 bfh.bfReserved1=bfh.bfReserved2=0; `ueOb  
 bfh.bfType=((WORD)('M'<< 8)|'B'); je3Qq1  
 bfh.bfSize=54+size; Bc-/s(/Eq  
 bfh.bfOffBits=54; kkMChe};5  
 CFile bf; m6}_kzFz  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ {.;qz4d`  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); hM>.xr  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8TU(5:xJo  
  bf.WriteHuge(lpData,size); K:Z(jF!j  
  bf.Close(); =FiO{Aw`N  
  nCount++; ^j10 f$B  
 } PY3bn).uR  
 GlobalFreePtr(lpData); jffNA^e  
 if(nCount==1) 0jPUDkH*  
  m_Number.Format("%d picture captured.",nCount); ""_G4{  
 else .yD 6$!6  
  m_Number.Format("%d pictures captured.",nCount); l]Ym)QP  
  UpdateData(FALSE); 5j0 Ib>\  
} Fq o h!F  
Gxxz4    
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) B(} 'yY@%u  
{ vM$hCV ~N  
 if(pMsg -> message == WM_KEYDOWN) >,_0Mem2Rr  
 { SkCux  
  if(pMsg -> wParam == VK_ESCAPE) pp7 $Q>6  
   return TRUE; [ gZR}E  
  if(pMsg -> wParam == VK_RETURN) &#gh :5  
   return TRUE; JR&yaOws  
 } 5v`lCu]  
 return CDialog::PreTranslateMessage(pMsg); :)T*:51{#  
} 8K8jz9.s  
cnw+^8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?Pf#~U_  
{ c9c3o{(6Y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ )~ &gBX  
  SaveBmp(); ab.B?bx  
  return FALSE; \j BA4?(S  
} 0@y`iZ] 1S  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Q00v(6V46  
 CMenu pop; :(" @U,  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); sX*L[3!vN  
 CMenu*pMenu=pop.GetSubMenu(0); EwuRIe;D  
 pMenu->SetDefaultItem(ID_EXITICON); /& c2y=/'C  
 CPoint pt; 2m*/$GZ  
 GetCursorPos(&pt); BSJS4+,E  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ^SsnCn-e  
 if(id==ID_EXITICON) x ju*zmu  
  DeleteIcon(); gX(Xj@=(&  
 else if(id==ID_EXIT) 0M&~;`W}  
  OnCancel(); 19pFNg'kA  
 return FALSE; .5s^a.e'O  
} 3c(mZ   
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Br42Qo2"T>  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) VN\VTSZh?\  
 AddIcon(); rl$"~/ oz  
 return res; @$;8k }  
} =VT\$ 5A  
Qnt9x,1m_  
void CCaptureDlg::AddIcon() #Q-#7|0&  
{ /`nkz  
 NOTIFYICONDATA data; ]s E)-8  
 data.cbSize=sizeof(NOTIFYICONDATA); @3=q9ftm  
 CString tip; yJ ljCu)f  
 tip.LoadString(IDS_ICONTIP); SyT{k\[  
 data.hIcon=GetIcon(0); P>_9>k@;Q  
 data.hWnd=GetSafeHwnd(); q@ ;1{  
 strcpy(data.szTip,tip); y65lbl%Z n  
 data.uCallbackMessage=IDM_SHELL; h+&iWb3;  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ;cPPx`0$9  
 data.uID=98; BIew\N  
 Shell_NotifyIcon(NIM_ADD,&data); V}7)>i$A  
 ShowWindow(SW_HIDE); bhbTloCR  
 bTray=TRUE; %;= ?r*]  
} 3;wiwN'  
N`3^:EJL8  
void CCaptureDlg::DeleteIcon() mO(Y>|mm  
{ so/0f1R?~  
 NOTIFYICONDATA data; J|^z>gP(  
 data.cbSize=sizeof(NOTIFYICONDATA); mh`uvqY  
 data.hWnd=GetSafeHwnd(); ur=:Ha  
 data.uID=98; mW+5I-~  
 Shell_NotifyIcon(NIM_DELETE,&data); XzqB=iX  
 ShowWindow(SW_SHOW); F7nwV Dc*  
 SetForegroundWindow(); oOAkwc%)b  
 ShowWindow(SW_SHOWNORMAL); W=LJhCpRHj  
 bTray=FALSE; nm]lPKU+Y  
} sDTw</@  
aJF/y3  
void CCaptureDlg::OnChange() ~ qaT jSP  
{ *tk=DsRW  
 RegisterHotkey(); .O(9\3q\  
} 1LhZmv  
 ST~YO  
BOOL CCaptureDlg::RegisterHotkey() pFZ$z?lI  
{ TX@ed  
 UpdateData(); 9^`cVjD5  
 UCHAR mask=0; & ,:!gYN  
 UCHAR key=0; zxD=q5in  
 if(m_bControl) [Ob'E!;<  
  mask|=4; L+T7Ge q  
 if(m_bAlt) "L1LL iS  
  mask|=2; ?TIi0;h  
 if(m_bShift) 72J=_d>+  
  mask|=1; Qy}pn=#Q  
  key=Key_Table[m_Key.GetCurSel()]; i+< v7?:`#  
 if(bRegistered){ T<b* =i  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); $>uUn3hSx\  
  bRegistered=FALSE; $cwmfF2C  
 } >,'guaa  
 cMask=mask; Y6hV ;[\F  
 cKey=key; PApr8Xe  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); D^P0X:T]  
 return bRegistered; %zRuIDmv  
} "UhE'\()  
A #m_w*  
  四、小结 N;BuBm5K  
1>Vq<z  
  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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