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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: 3r!6Z5P7{'  
  l^w=b~|7=  
  一、实现方法 im|( 4 f  
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  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: X@|'#%  
i,1=5@rw5  
#pragma data_seg("shareddata") 2W:R{dHE  
HHOOK hHook =NULL; //钩子句柄 3 HOJCgit  
UINT nHookCount =0; //挂接的程序数目 Gf( hN|X.  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Q;W[$yvW  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 O|=5+X  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey oa$-o/DhB  
static int KeyCount =0; {m~.'DU  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 \7rFfN3  
#pragma data_seg() c[J(H,mt/  
A}pmr  
  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。 zgRZgVj  
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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: r:lv[/ D  
iz!E1(z(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR B/.+&AJw  
cKey,UCHAR cMask) *F0O*n*7W  
{ EjW3_ %  
 BOOL bAdded=FALSE; ~sT/t1Rp  
 for(int index=0;index<MAX_KEY;index++){ )zz^RB\p  
  if(hCallWnd[index]==0){ H6%QM}t  
   hCallWnd[index]=hWnd; (? j $n?p  
   HotKey[index]=cKey; 8}z]B^?Fy  
   HotKeyMask[index]=cMask; yH5^EY7rQ  
   bAdded=TRUE; 5S`_q&  
   KeyCount++; =&G<^7  
   break; |b" h+  
  } ]=\vl>W  
 } ?3 {&"  
 return bAdded; BH6)`0&2*N  
} qniP`P4E  
//删除热键 IZ+kw.6e  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V}gP'f07zy  
{ CZ* #FY  
 BOOL bRemoved=FALSE; Agt6G\ n  
 for(int index=0;index<MAX_KEY;index++){ zmd,uhNc:  
  if(hCallWnd[index]==hWnd){ )a"rj5~-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ .XDY1~w0  
    hCallWnd[index]=NULL; U$jw8I'.  
    HotKey[index]=0; D#Qfa!=g  
    HotKeyMask[index]=0; afrU>#+"  
    bRemoved=TRUE; Bu|U z0Y  
    KeyCount--; eD5:0;X2  
    break; ,p2BB"^_i  
   } ,ab_u@  
  } W[Kv Qt3%  
 } )c|S)iJ7=z  
 return bRemoved; V@krw"vW  
} I3sH8/*  
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  DLL中的钩子函数如下: -7jP'l=h  
J |4q9$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) xS.Rpx/8  
{ vC$Q4>m  
 BOOL bProcessed=FALSE; HQPb  
 if(HC_ACTION==nCode) fXfBDB  
 { 4CAV)  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 4Uz1~AuNxb  
   switch(wParam) h1O^~"x  
   {  )Dn~e#  
    case VK_MENU: V)x(\ls]SX  
     MaskBits&=~ALTBIT; qkQ _#  
     break; E.~;  
    case VK_CONTROL: a(Q4*XH4  
     MaskBits&=~CTRLBIT; `"~s<+  
     break; 81?7u!=ic+  
    case VK_SHIFT: 1$S;#9PQ  
     MaskBits&=~SHIFTBIT; WOqAVd\  
     break; WZ}je!82  
    default: //judge the key and send message HqM>K*XKU  
     break; 5W hR |  
   } rb8c^u#r  
   for(int index=0;index<MAX_KEY;index++){ ]MI> "hn  
    if(hCallWnd[index]==NULL) &?+vHE}  
     continue; ifA=qn0=}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cfZG3 "  
    { Bfh[C]yy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); b-Fv vA  
     bProcessed=TRUE; tF:'Y ~3 p  
    } J6m`XC  
   } -anLp8G*  
  } 'p0|wM_  
  else if((lParam&0xc000ffff)==1){ //有键按下 Y)D~@|D,  
   switch(wParam) `v2]Jk<  
   { 4a'O#;h o  
    case VK_MENU: DGfhS`X  
     MaskBits|=ALTBIT; ?Q$LIoR  
     break; /48W]a}JS  
    case VK_CONTROL: %cIF()  
     MaskBits|=CTRLBIT; z^(6>U ?  
     break; 2kv%k3 Q{  
    case VK_SHIFT: .-kqt^Gc  
     MaskBits|=SHIFTBIT; PqOy"HO  
     break; ,$;g'z!N  
    default: //judge the key and send message m]g"]U:  
     break; oECM1'=Bf  
   } q\ihye  
   for(int index=0;index<MAX_KEY;index++){ !sF! (u7  
    if(hCallWnd[index]==NULL) <9za!.(zu  
     continue; OBF3)L]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }h+_kRQ  
    { w8~J5XS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); g4n& k  
     bProcessed=TRUE; F[aow$",+}  
    } i&cH  
   } @(:ah  
  } _ F0qq j  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 {?a9>g-BW  
   for(int index=0;index<MAX_KEY;index++){ d<*4)MRN  
    if(hCallWnd[index]==NULL) qF9rY)ifm  
     continue; 7Pt*V@DHS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $D,m o2I  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); doR'E=Z4h  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 +{%@kX<V_  
   } + n1jP<[<N  
  } ^iaeY jI  
 } vBUl6EmWu  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,+p&ZpH  
} B x(+uNQ  
)p.+39]{2  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: >M` swEj  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); X^3 0a*sj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); YK# QH"}  
#=WDJ T:  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: f;/t7=>d  
* *?mZtF  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (wJtEoB9^  
{ ;O YwZ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) E(G=~>P  
 { Fa(}:Ug  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 `I$qMw,@  
  SaveBmp(); ?e |'I"  
  return FALSE; rT`D@ I  
 } #vO3*-hs  
 …… //其它处理及默认处理 o3H+.u$  
} 1SBc:!2  
qa![oMKc  
=N,KVMxw  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 y)3(  
`92 D]^g  
  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。 ArkFC  
c%.f|/.k  
  二、编程步骤 9X&Xs/B  
>/"XX,3  
  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"; H*QN/{|RU  
~qNpPIrGr  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; (l 2 2p  
YQR*?/?a  
  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; RJs_ S  
CiP-Zh[gZ  
  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; SwQ.tK1p  
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  5、 添加代码,编译运行程序。 $ql-"BB  
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三、程序代码 (.,E6H|zI  
}nE#0n  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL )Jx!VJ^Y  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) @ ADY?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ u)P$xkf  
#if _MSC_VER > 1000 +DKrX  
#pragma once |Y<ca   
#endif // _MSC_VER > 1000 ^F*)Jq  
#ifndef __AFXWIN_H__ F~d !Ub$>  
#error include 'stdafx.h' before including this file for PCH sF;1)7]Pq  
#endif +N[dYm  
#include "resource.h" // main symbols bcpH|}[F)  
class CHookApp : public CWinApp Fga9  
{ @{_PO{=\C  
 public: yZ:|wxVY  
  CHookApp(); cFLu+4.jsG  
  // Overrides Cu({%Gy+  
  // ClassWizard generated virtual function overrides ^JtGT  
  //{{AFX_VIRTUAL(CHookApp) hBsjO3n  
 public: whNRUOK:  
  virtual BOOL InitInstance(); ZP)=2'RY  
  virtual int ExitInstance(); dh/:H/k kR  
  //}}AFX_VIRTUAL ,Ucb)8a  
  //{{AFX_MSG(CHookApp) pb%#`2"  
  // NOTE - the ClassWizard will add and remove member functions here. *DkA$Eu3u  
  // DO NOT EDIT what you see in these blocks of generated code ! ,WOF)   
  //}}AFX_MSG 9[N' HpQ3  
  DECLARE_MESSAGE_MAP() nVG\*#*]|  
}; z>j%-3_1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Y tGH>0}h  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); G%YD2<V  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @6*<Xs =  
BOOL InitHotkey(); y<F$@  
BOOL UnInit(); zJ9ZqC]  
#endif z!Kadqns  
hl~(&D1^  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ;$i9gP[|m  
#include "stdafx.h" @ x*#7Y  
#include "hook.h"  v )7d  
#include <windowsx.h> ~Y)Au?d(a  
#ifdef _DEBUG qe(X5 ?#;  
#define new DEBUG_NEW `j>qOT  
#undef THIS_FILE <O$'3 _S"D  
static char THIS_FILE[] = __FILE__; n E-=7S L  
#endif glHag"(  
#define MAX_KEY 100 wX 41R]pF  
#define CTRLBIT 0x04 6X|KKsPzX  
#define ALTBIT 0x02 #bu`W!p}  
#define SHIFTBIT 0x01 mKpUEJ<a  
#pragma data_seg("shareddata") k5-mK{RZ  
HHOOK hHook =NULL; -I=}SZ  
UINT nHookCount =0; qUtVqS  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey XQ(`8Jl&^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT rvE!Q=y~  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey >^J!Z~;L)  
static int KeyCount =0; oU~V0{7g  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift '%RMpyK~  
#pragma data_seg() 1rPeh{SZ  
HINSTANCE hins; ^DZiz[X+|  
void VerifyWindow(); ;8 McG83  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) PLLlo~Bb  
//{{AFX_MSG_MAP(CHookApp) >4EcV1y  
// NOTE - the ClassWizard will add and remove mapping macros here. {bETHPCf  
// DO NOT EDIT what you see in these blocks of generated code! M~662]Ekk  
//}}AFX_MSG_MAP FeV=4tsy  
END_MESSAGE_MAP() UjKHGsDi4  
D'nV &m  
CHookApp::CHookApp() &I(|aZx?J  
{ uaDU+y wL  
 // TODO: add construction code here, 6l_8Q w*5I  
 // Place all significant initialization in InitInstance l3g6y 9;  
} 30H:x@='9  
dN*<dz+4r  
CHookApp theApp; +}+hTY$a  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) WZ&#O#(eO`  
{ r LfS9H  
 BOOL bProcessed=FALSE; }Xc|Z.6  
 if(HC_ACTION==nCode) "\_}"0 H  
 { M.OWw#?p:_  
  if((lParam&0xc0000000)==0xc0000000){// Key up 5 h{Hf]A  
   switch(wParam) LnJ7i"Q  
   { It_yh #s  
    case VK_MENU: t*}<v@,  
     MaskBits&=~ALTBIT; 8=nm`7(]  
     break; }p- %~ Y  
    case VK_CONTROL: 5Rec}H  
     MaskBits&=~CTRLBIT; RmNF]"3%  
     break; ^d=Z/d[  
    case VK_SHIFT: {Zseu$c  
     MaskBits&=~SHIFTBIT; ,}2j Fb9z4  
     break;  %ANPv=  
    default: //judge the key and send message r*p%e\ 3  
     break; Gc 8  
   } .`h+fqa  
   for(int index=0;index<MAX_KEY;index++){ O3BU.X1'%  
    if(hCallWnd[index]==NULL) l%w7N9  
     continue; z:fhq:R(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U_8I$v-~  
    { }bnkTC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); '\_)\`a|  
     bProcessed=TRUE; fglZjT  
    } T8m%_U#b  
   } ZRQPOy  
  } W@S9}+wl*  
  else if((lParam&0xc000ffff)==1){ //Key down sN?:9J8  
   switch(wParam) YJL=|v  
   { X1'Ze,34  
    case VK_MENU: ^y6CV4T+  
     MaskBits|=ALTBIT; h`GV[Oo:  
     break; O0{v`|w9+  
    case VK_CONTROL: RCX4;,DHx  
     MaskBits|=CTRLBIT; B+B v(p  
     break; qnm9L w#  
    case VK_SHIFT: 3}gK`1Nq1  
     MaskBits|=SHIFTBIT; AN1bfF:C  
     break; ~w*ojI  
    default: //judge the key and send message ``z="oD  
     break; 0,3 ':Df  
   } dk]ro~ [  
   for(int index=0;index<MAX_KEY;index++) 7> ]C2!  
   { ~ dk1fh  
    if(hCallWnd[index]==NULL) Ce)Wvuh  
     continue; UD(#u3z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `dNb%f>  
    { 7>mYD3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,Z^GN%Q7a  
     bProcessed=TRUE; h/VYH(Tj  
    } CFA>  
   } R"=M5  
  } ky%%H;  
  if(!bProcessed){ .R"L$V$RU.  
   for(int index=0;index<MAX_KEY;index++){ X5yhS  
    if(hCallWnd[index]==NULL) N|)V/no6  
     continue; 1lQ1 0J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) j w462h  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >k#aB.6  
   } {2Ibd i  
  } ;5l|-&{@*  
 } [eN{Ft0x  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6qDD_:F  
} NNdS:(  
#e=^-yE  
BOOL InitHotkey() !58JK f  
{ sg2C_]i,H  
 if(hHook!=NULL){ &ivIv[LV  
  nHookCount++; ?(=B=a[  
  return TRUE; 8UcT? Zp  
 } cA\W|A)  
 else ,'6GG+  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;Vy'y  
  if(hHook!=NULL) 0Q9OQqg m  
   nHookCount++; Uwk|M?94  
  return (hHook!=NULL); ;v'Y' !-J  
} OY#_0p)i  
BOOL UnInit() z~5'p(|@f  
{ pk4&-iu9  
 if(nHookCount>1){ Jp#cFUa t  
  nHookCount--; `QF|> N  
  return TRUE; gD\}CxtG  
 } mx4*zj  
 BOOL unhooked = UnhookWindowsHookEx(hHook); <i6MbCB  
 if(unhooked==TRUE){ ]>o2P cb;  
  nHookCount=0; 3Cl9,Z"&6$  
  hHook=NULL; Uf<vw3  
 } 8(;i~f:bCW  
 return unhooked; 9 JtG&^*  
} OXB-.<  
!/zj7z !  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jFv<]D%A[  
{ Uy:.m  
 BOOL bAdded=FALSE; ?0a 0 R  
 for(int index=0;index<MAX_KEY;index++){ hdL2`5RFF  
  if(hCallWnd[index]==0){ MO/N*4U2  
   hCallWnd[index]=hWnd; QAwj]_  
   HotKey[index]=cKey; k N+(  
   HotKeyMask[index]=cMask; : eFc.>KoD  
   bAdded=TRUE; 3\G=J  
   KeyCount++; %R>S"  
   break; (ce NVo&  
  } zJ`(LnV  
 } xW4+)F5P(  
 return bAdded; Fm':sd)'X  
} dFFqs&cQ  
,gc#N  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) cg%CYV)  
{ WU\bJ}  
 BOOL bRemoved=FALSE; W|e>  
 for(int index=0;index<MAX_KEY;index++){ ($W 5fbu  
  if(hCallWnd[index]==hWnd){ gEsR-A!m  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ j[cjQ]>~'  
    hCallWnd[index]=NULL; 1n"X?K5;A  
    HotKey[index]=0; &L]*]Xz;  
    HotKeyMask[index]=0; !y?hn$w0  
    bRemoved=TRUE; sQs5z~#51*  
    KeyCount--; zOdKB2_J7  
    break; sD +G+  
   } E=NY{| >  
  } {SJ7Yfs  
 } ?< QFW#:)  
 return bRemoved; BaAb4{  
} :nUsC+oBS  
bicL %I2h  
void VerifyWindow() Fw m:c[G  
{ I "2FTGA  
 for(int i=0;i<MAX_KEY;i++){ 5.#9}]  
  if(hCallWnd!=NULL){ >}*jsqaVU  
   if(!IsWindow(hCallWnd)){ l)s+"C#  
    hCallWnd=NULL; X~3P?O]kFv  
    HotKey=0; "n, ZP@M;  
    HotKeyMask=0; }8: -I Nj4  
    KeyCount--; :,,y63-f4  
   } X)OP316yx  
  } Qu_T&  
 } hp4(f W  
} %Qz`SO8x?  
;%alZ  
BOOL CHookApp::InitInstance() v6\2m c.  
{ 3+5\xRq  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); i%8&g2  
 hins=AfxGetInstanceHandle(); qL.Y_,[[  
 InitHotkey(); U(4_X[qD  
 return CWinApp::InitInstance(); KBe {  
} ! hr@{CD  
(Nb1R"J `  
int CHookApp::ExitInstance() >L`mF_WG  
{ ;_5 =g  
 VerifyWindow(); ~HRWKPb  
 UnInit(); 3y B6]U  
 return CWinApp::ExitInstance(); #!,`EU  
} p|V1Gh<  
ZMg9Qt  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file  7`@?3?  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 0\nhg5]?  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 5yi q#  
#if _MSC_VER > 1000 .@-]A   
#pragma once SkRQFm0a~  
#endif // _MSC_VER > 1000 [+,U0OV,  
G%R`)Z]8&  
class CCaptureDlg : public CDialog G3^]Wwu  
{ rxp9B>~  
 // Construction 6G$tYfX  
 public: xH#a|iT?(  
  BOOL bTray; wg_CI,Kq  
  BOOL bRegistered; 72vGfT2HtZ  
  BOOL RegisterHotkey(); hg'!  
  UCHAR cKey; @~G`~8   
  UCHAR cMask;  m+{: ^  
  void DeleteIcon(); [<a%\:c m4  
  void AddIcon(); bvS\P!m\c  
  UINT nCount; kdPm # $-  
  void SaveBmp(); psy(]Pf  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor "gajBY  
  // Dialog Data s{J!^q  
  //{{AFX_DATA(CCaptureDlg) N/{Yi _n  
  enum { IDD = IDD_CAPTURE_DIALOG }; ]m#MwN$  
  CComboBox m_Key; /1#Q=T  
  BOOL m_bControl; y"L`bl A9}  
  BOOL m_bAlt; Rn_W|"  
  BOOL m_bShift; 4?M3#],'h  
  CString m_Path; cBR8HkP~  
  CString m_Number; -JhjTA  
  //}}AFX_DATA D4]B>  
  // ClassWizard generated virtual function overrides YGV#.  
  //{{AFX_VIRTUAL(CCaptureDlg) jTUf4&b-  
 public: ~'QeN%qadP  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *([)X2A@+  
 protected: JP,(4h *  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iA{jKk=  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); yP9wYF^A\  
  //}}AFX_VIRTUAL }d\Tk(W  
  // Implementation f3>6:(  
 protected: v:Z4z6M-  
  HICON m_hIcon; N?{1'=Om  
  // Generated message map functions pW--^aHu  
  //{{AFX_MSG(CCaptureDlg) +y4AUU:Q  
  virtual BOOL OnInitDialog(); ^pV>b(?qw  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); bKMR7&e.Ep  
  afx_msg void OnPaint(); ~TFYlV  
  afx_msg HCURSOR OnQueryDragIcon(); !5SQN5K  
  virtual void OnCancel(); agU!D[M_G  
  afx_msg void OnAbout(); "zIq)PY  
  afx_msg void OnBrowse(); D62 NU  
  afx_msg void OnChange(); <6O _t,K]  
 //}}AFX_MSG C"^hMsU8  
 DECLARE_MESSAGE_MAP() X8SRQO^  
}; \pD=Lv9  
#endif QUZQY`' @  
N|O]z  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file +\8krA  
#include "stdafx.h" i@R$g~~-D  
#include "Capture.h" /< 7C[^h{-  
#include "CaptureDlg.h" ) !}-\5F  
#include <windowsx.h> MAD}Tv\S7  
#pragma comment(lib,"hook.lib") <RPoQ'.^  
#ifdef _DEBUG b'oGt,  
#define new DEBUG_NEW /`O]etr`d  
#undef THIS_FILE m":SE?{{&  
static char THIS_FILE[] = __FILE__; {+ 6D-rDw  
#endif V>jhGf  
#define IDM_SHELL WM_USER+1 PSf5p\<5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 71/m.w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W aGcoj  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; YyJ{  
class CAboutDlg : public CDialog Z'*Z@u3  
{ 7kX$wQZ_  
 public: YaNH.$.:  
  CAboutDlg(); #W%)$k c  
  // Dialog Data ^?7dOW  
  //{{AFX_DATA(CAboutDlg)  I`'a'  
  enum { IDD = IDD_ABOUTBOX }; UUMdZ+7  
  //}}AFX_DATA 1^f.5@tV  
  // ClassWizard generated virtual function overrides =1 BNCKT<  
  //{{AFX_VIRTUAL(CAboutDlg) %X"m/4c8}  
 protected: E_D ^O  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]dbSa1?  
  //}}AFX_VIRTUAL 0+<eRR9 -  
  // Implementation 4o4 =  
 protected: 4`U0">gY  
  //{{AFX_MSG(CAboutDlg) xBRh !w  
  //}}AFX_MSG ^>X)"'0+  
  DECLARE_MESSAGE_MAP() c@ZS|U*(  
}; 4OOn,09  
<{cNgKd9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) JYg% ~tW'  
{ 7*>S;$  
 //{{AFX_DATA_INIT(CAboutDlg) :`Uyn!w  
 //}}AFX_DATA_INIT oO#xx)b  
} mo;)0Vq2l  
x* =sRf  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) y3cf[Q  
{ )b&-3$?  
 CDialog::DoDataExchange(pDX); GT'7,+<?N  
 //{{AFX_DATA_MAP(CAboutDlg) Zv|p>q`R2  
 //}}AFX_DATA_MAP >^yc=mM(g3  
} /j' B\,  
F?8BS*r_  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) @ 2!C^}d3F  
 //{{AFX_MSG_MAP(CAboutDlg) *j /S4qG  
 // No message handlers Cl6m$YUt  
 //}}AFX_MSG_MAP ) Ab6!"'  
END_MESSAGE_MAP() sp=OT-Pfp  
!0ce kSesr  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Y8%0;!T  
: CDialog(CCaptureDlg::IDD, pParent) |/;U)M  
{ Q'|0?nBOY  
 //{{AFX_DATA_INIT(CCaptureDlg) OpK. Lsd0y  
  m_bControl = FALSE; 8wII{FHX  
  m_bAlt = FALSE; +:>JZ$  
  m_bShift = FALSE; ms}f>f=  
  m_Path = _T("c:\\"); @GG(7r\/B  
  m_Number = _T("0 picture captured."); V\6(d  
  nCount=0; <8rgtu!VU  
  bRegistered=FALSE; ^Ue0mC7m  
  bTray=FALSE; H\fcY p6  
 //}}AFX_DATA_INIT Sk/#J!T8{  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (S  k#x  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ]^:hyO K  
} Re*|$r#  
,M) k7t:  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) _\dt?(m|  
{ SPkKiEdM  
 CDialog::DoDataExchange(pDX); L6:W'u^  
 //{{AFX_DATA_MAP(CCaptureDlg) mG831v?  
  DDX_Control(pDX, IDC_KEY, m_Key); $s-9|Lbs`  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); S~0JoCeo  
  DDX_Check(pDX, IDC_ALT, m_bAlt); k]?z~p  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); rQ    
  DDX_Text(pDX, IDC_PATH, m_Path); %M{k.FE(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Mlv<r=E  
 //}}AFX_DATA_MAP )?w&oIj5  
} g .x=pt  
2yN%~C?$  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 2wx!Lpr<i_  
//{{AFX_MSG_MAP(CCaptureDlg) P</s)"@  
 ON_WM_SYSCOMMAND() _+ twq i  
 ON_WM_PAINT() .Gizz</P~  
 ON_WM_QUERYDRAGICON() 5M%,N-P^  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) G HD^%)T5^  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) d/XlV]#2x\  
 ON_BN_CLICKED(ID_CHANGE, OnChange) A7k'K4  
//}}AFX_MSG_MAP O)`fvpVU  
END_MESSAGE_MAP() 6hkkNXqkf  
[N)#/ 6j  
BOOL CCaptureDlg::OnInitDialog() oi2J :Y4  
{  YywEZ?X  
 CDialog::OnInitDialog(); ],8;eq%W)  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); E: 9o;JU  
 ASSERT(IDM_ABOUTBOX < 0xF000); _QR g7  
 CMenu* pSysMenu = GetSystemMenu(FALSE); iQt!PMF.  
 if (pSysMenu != NULL) b5A Gk  
 { F:%^&%\  
  CString strAboutMenu; M h`CP  
  strAboutMenu.LoadString(IDS_ABOUTBOX); k$C"xg2  
  if (!strAboutMenu.IsEmpty()) -$U@By<SJ  
  { u]HS(B,ht  
   pSysMenu->AppendMenu(MF_SEPARATOR); mZwi7s&u  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); W*k`  
  } v&xKi>A il  
 } z!fdx|PUX  
 SetIcon(m_hIcon, TRUE); // Set big icon u(W^Nou/+  
 SetIcon(m_hIcon, FALSE); // Set small icon c~P)4(udT  
 m_Key.SetCurSel(0); W_^>MLq  
 RegisterHotkey(); ajW[eyX  
 CMenu* pMenu=GetSystemMenu(FALSE); jFtg.SD  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); RCzV5g  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 81Z4>F:  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); wGPotPdE2  
 return TRUE; // return TRUE unless you set the focus to a control EMLx?JnP  
} osl=[pm  
\}Dpb%^\  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) D%-{q>F!gf  
{ tqK=\{U  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) D9~}5  
 { OCCEL9d  
  CAboutDlg dlgAbout; sf`PV}a1  
  dlgAbout.DoModal(); ;4 ,'y  
 } tWm>j  
 else J' W}7r  
 { n!a<:]b<  
  CDialog::OnSysCommand(nID, lParam); E *BSfn&i  
 } W9dYljnZ8i  
} _R)&k%i}  
q0Xoj__c!A  
void CCaptureDlg::OnPaint() c4\C[$  
{ MU|{g 5/ )  
 if (IsIconic()) 8Jr1_a  
 { ?0{yq>fTu  
  CPaintDC dc(this); // device context for painting i^WIr h3a  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); lzEb5mg  
  // Center icon in client rectangle >9=:sSQu  
  int cxIcon = GetSystemMetrics(SM_CXICON); Qm< gb+  
  int cyIcon = GetSystemMetrics(SM_CYICON); +@0TMK,P  
  CRect rect; yO=p3PV d  
  GetClientRect(&rect); <;%0T xK|U  
  int x = (rect.Width() - cxIcon + 1) / 2; E/ijvuO  
  int y = (rect.Height() - cyIcon + 1) / 2; \<ZLoy_  
  // Draw the icon 4.8nY\_WF  
  dc.DrawIcon(x, y, m_hIcon); {7qA&c=  
 } >8|+%pK8<  
 else `fz,Lh*v  
 { 2JVxzj<~`  
  CDialog::OnPaint(); :j@8L.<U  
 } (3VGaUlx  
} ),=@q+{E{  
1Y#HcW&  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3[r";Wt#  
{ Z'Q*L?E8M  
 return (HCURSOR) m_hIcon; %*kLEA*v  
} "}@i+oS  
Lj8)' [K"  
void CCaptureDlg::OnCancel() n$4|P O$X  
{ <c+K3P'3?  
 if(bTray) X8b|]Nr  
  DeleteIcon(); [SkKz>rC  
  CDialog::OnCancel(); qgx?"$ Z  
} 0 " y%9  
>Q=Ukn;k  
void CCaptureDlg::OnAbout() d8E,o7$m  
{ |g<*Rk0  
 CAboutDlg dlg; /THnfy \  
 dlg.DoModal(); &Yf",KcL*I  
} n_P3\Y|  
'a#mViPTQ)  
void CCaptureDlg::OnBrowse() f"Vgefk  
{ A "S/^<  
 CString str; %&+TbDE+T  
 BROWSEINFO bi; E"#Xc@  
 char name[MAX_PATH]; .%'Z~|K4  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); mibpG9+d  
 bi.hwndOwner=GetSafeHwnd(); VYaSB?`/  
 bi.pszDisplayName=name; j)Y[4 ^k^  
 bi.lpszTitle="Select folder"; gRAC d&)  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ` H XEZ|  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]GX \|1L  
 if(idl==NULL) ZB[k{Y  
  return; ong""K4H  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); &cu!Hx  
 str.ReleaseBuffer(); ,gMy@  
 m_Path=str; (#|{%4g@>  
 if(str.GetAt(str.GetLength()-1)!='\\') rk|a5-i  
  m_Path+="\\"; fxgU~'  
 UpdateData(FALSE); pZk6 w1d!  
} rC BfD  
,PECYwegkt  
void CCaptureDlg::SaveBmp() lZW K2  
{ =X-Tcj?3g  
 CDC dc; %WGuy@tL  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ZCYS\E 7X  
 CBitmap bm; &:3Z.G  
 int Width=GetSystemMetrics(SM_CXSCREEN); _1L(7|^~y[  
 int Height=GetSystemMetrics(SM_CYSCREEN); so+4B1$)q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); !^y y0`k6  
 CDC tdc; tHh HrMxO  
 tdc.CreateCompatibleDC(&dc); c #lPc>0xb  
 CBitmap*pOld=tdc.SelectObject(&bm); vfwA$7N  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); r &%.z*q  
 tdc.SelectObject(pOld); lw[e *q{s.  
 BITMAP btm; R-rCh.  
 bm.GetBitmap(&btm); Wto ;bd  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; C5@V/vA  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); (K :]7  
 BITMAPINFOHEADER bih; l-Nly>~  
 bih.biBitCount=btm.bmBitsPixel; i ev>9j  
 bih.biClrImportant=0; Bs8[+Ft5  
 bih.biClrUsed=0; g%a|q~)  
 bih.biCompression=0; |0.Xl+7  
 bih.biHeight=btm.bmHeight; 2(M6(xH>  
 bih.biPlanes=1; A}5fCx.{  
 bih.biSize=sizeof(BITMAPINFOHEADER); "e6|"w@8  
 bih.biSizeImage=size; iiG f'@/  
 bih.biWidth=btm.bmWidth; 8K{[2O7i)  
 bih.biXPelsPerMeter=0; 0Fw6Dq<8-!  
 bih.biYPelsPerMeter=0; `f9gC3Hk  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); &aG*k*  
 static int filecount=0; BqH]-'1G  
 CString name; z0bJ?~w,  
 name.Format("pict%04d.bmp",filecount++); @;:>GA  
 name=m_Path+name; gSt`%  
 BITMAPFILEHEADER bfh; '91".c,3?  
 bfh.bfReserved1=bfh.bfReserved2=0; F$MX,,4U  
 bfh.bfType=((WORD)('M'<< 8)|'B'); F|+W.9  
 bfh.bfSize=54+size; xW_yLbE  
 bfh.bfOffBits=54; <rIz Z'D  
 CFile bf; 6!q#x[A  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ^qvZ XS  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Uxu\u0*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); E9}{1A  
  bf.WriteHuge(lpData,size); 8VQ 24r  
  bf.Close(); yx>_scv,T  
  nCount++; ycAKK?O*  
 } a9U_ug58  
 GlobalFreePtr(lpData); tPfFqqT  
 if(nCount==1) ]zfG~^.  
  m_Number.Format("%d picture captured.",nCount); #VVr"*7$  
 else Vj?DA5W`'  
  m_Number.Format("%d pictures captured.",nCount); +&|S'7&{  
  UpdateData(FALSE); xV\5<7qk5g  
} $uDqqG(^  
bh p5<N  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) IMGP'g  
{ A,gEM4  
 if(pMsg -> message == WM_KEYDOWN) beXNrf=bG  
 { sJG5/w  
  if(pMsg -> wParam == VK_ESCAPE) hk>;pU(  
   return TRUE; MJ{%4S{K,p  
  if(pMsg -> wParam == VK_RETURN) )C%N]9FvY  
   return TRUE; kA wNly  
 } i38[hQR9a  
 return CDialog::PreTranslateMessage(pMsg); [I;^^#'P  
} 5W? v'"  
,*I@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) g I]GUD-  
{ H%F>@(U  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ :G5uocVk  
  SaveBmp(); \e3`/D  
  return FALSE; qk/:A+  
} %G3(,Qz  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ je/!{(  
 CMenu pop; ;]sYf  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ` `U^COD  
 CMenu*pMenu=pop.GetSubMenu(0); m Lk(y*  
 pMenu->SetDefaultItem(ID_EXITICON); g'$tj&Vk:  
 CPoint pt; !g!5_ |  
 GetCursorPos(&pt); qJ4T]FVN  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); `D$Jv N  
 if(id==ID_EXITICON) r|Z5Xc  
  DeleteIcon(); O$u"/cwe*  
 else if(id==ID_EXIT) O1&b]C#  
  OnCancel(); ^wb:C[r!V  
 return FALSE; p[AO' xx  
} eLD|A=X?  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); KhbYr$  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) q.YfC  
 AddIcon(); Q]/Uq~m C  
 return res; [U, ?R  
} p>vU?eF  
``VW;l{  
void CCaptureDlg::AddIcon() _nh[(F<hz  
{ tCG76LH  
 NOTIFYICONDATA data; t"072a  
 data.cbSize=sizeof(NOTIFYICONDATA); a|7a_s4(  
 CString tip; 1BHG'y  
 tip.LoadString(IDS_ICONTIP); `Z"Q^  
 data.hIcon=GetIcon(0); 8I;XS14Q  
 data.hWnd=GetSafeHwnd(); u"1rF^j6k  
 strcpy(data.szTip,tip); s*/bi W  
 data.uCallbackMessage=IDM_SHELL; yS(}:'`r  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !~]<$WZV  
 data.uID=98; }Ew hj>w  
 Shell_NotifyIcon(NIM_ADD,&data); j^tW Iz  
 ShowWindow(SW_HIDE); 39wa|:I  
 bTray=TRUE; Vwk#qgnX  
} %UUH"  
u9+kLepOT  
void CCaptureDlg::DeleteIcon() uDw.|B2ui  
{ yXI >I  
 NOTIFYICONDATA data; 'H8(=9O1d  
 data.cbSize=sizeof(NOTIFYICONDATA); ",aT WQgN  
 data.hWnd=GetSafeHwnd(); tVrY3)c  
 data.uID=98; YOr:sb   
 Shell_NotifyIcon(NIM_DELETE,&data); GeszgtK{T  
 ShowWindow(SW_SHOW); Q\ /uKQ  
 SetForegroundWindow(); M-)R Q-h  
 ShowWindow(SW_SHOWNORMAL); X$%4$  
 bTray=FALSE; c~QS9)=E  
} =OIw*L8C"I  
 qy)_wM  
void CCaptureDlg::OnChange() BrRL7xX  
{ K~=UUB  
 RegisterHotkey(); [/s&K{+c  
} #U8rO;$  
yz8mP3"c:o  
BOOL CCaptureDlg::RegisterHotkey() fXI:Y8T  
{ n1 6 `y}  
 UpdateData(); 0Wa}<]:^  
 UCHAR mask=0; G,Z^g|6  
 UCHAR key=0; .itw04Uru  
 if(m_bControl) toN^0F?Qm  
  mask|=4; H~ZV *[A`  
 if(m_bAlt) X\EVTd)@  
  mask|=2; 2(5ebe[  
 if(m_bShift) qTZFPfyU  
  mask|=1; n  -(  
  key=Key_Table[m_Key.GetCurSel()]; Hbv6_H  
 if(bRegistered){ qW:HNEiir  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); kmzH'wktt  
  bRegistered=FALSE; 6T 8!xyi-+  
 } DCqY|4Qc  
 cMask=mask; pym!U@$t  
 cKey=key; F}Vr:~  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); `Al;vVMRO  
 return bRegistered; ctE\ q  
} uqz]J$  
SBA?^T  
  四、小结 @(r /dZc  
`al<(FwGE  
  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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