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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: 0YHYxn  
  RDJ82{  
  一、实现方法 @nW'(x(  
L7[X|zmy*x  
  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: E'fX&[  
r}Q@VS% %  
#pragma data_seg("shareddata") Q9nu"x %  
HHOOK hHook =NULL; //钩子句柄 6p e4Ni7I2  
UINT nHookCount =0; //挂接的程序数目 8Y]u:v  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 w`"W3(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 (''$' 5~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey MQhYJ01i  
static int KeyCount =0; UfO'.8*v  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 WoJ]@Me8  
#pragma data_seg() kv[OW"8t  
Psg +\14  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 N/`g?B[  
o(BYT9|.kw  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: p$&_fzb  
~91uk3ST?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ;9 R40qi  
cKey,UCHAR cMask) >E{#HPpBi  
{ N n:m+ZDo^  
 BOOL bAdded=FALSE; mT}Aje-L  
 for(int index=0;index<MAX_KEY;index++){ v UJ sFR  
  if(hCallWnd[index]==0){ a'c9XG}  
   hCallWnd[index]=hWnd; 7?)m(CFy  
   HotKey[index]=cKey; H74NU_   
   HotKeyMask[index]=cMask; N7%=K9  
   bAdded=TRUE; &Qz"nCvJ  
   KeyCount++; 48W:4B'l9  
   break; 06Sqn3MB  
  } P2s^=J0@  
 } `7+tPbjs  
 return bAdded; K1CMLX]m  
} sz){uOI  
//删除热键 \=TWYj_Ah  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )GQ D*b  
{ us(sZG  
 BOOL bRemoved=FALSE; u~j'NOv  
 for(int index=0;index<MAX_KEY;index++){ H 7 o$O  
  if(hCallWnd[index]==hWnd){ `=WzG"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^2P;CAjj-  
    hCallWnd[index]=NULL; Yf%[6Y{  
    HotKey[index]=0; 2-/YYe;C  
    HotKeyMask[index]=0; 5LnB]dW  
    bRemoved=TRUE; Qq6%53  
    KeyCount--; a2 IV!0x  
    break; t(Cq(.u`:  
   } \v B9fA:*  
  } a'(lVZA;  
 } +/1P^U /  
 return bRemoved; gqKC4'G0  
} 1mkQ"E4  
zcbA)  
U* c{:K-C  
  DLL中的钩子函数如下: jFK9?cLT  
+K @J*W 1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) E}E7VQjM  
{ !dYX2!lvT  
 BOOL bProcessed=FALSE; %6vMpB`g  
 if(HC_ACTION==nCode) EC:x  ,i  
 { _~(M A-l  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 kY0g}o'<  
   switch(wParam) AF07KA#  
   {  M]pel\{M  
    case VK_MENU: |i jW_r  
     MaskBits&=~ALTBIT; _r^G%Mvy|  
     break; ]ys4  
    case VK_CONTROL: 1-ndJ@Wlz  
     MaskBits&=~CTRLBIT; c9/ 'i  
     break; =[43y%   
    case VK_SHIFT: ahz@HX  
     MaskBits&=~SHIFTBIT; GHJQ d&G8G  
     break; :ok!,QN  
    default: //judge the key and send message fNmG`Ke  
     break; %K/G+  
   } 0VWCm( f-  
   for(int index=0;index<MAX_KEY;index++){ C=pPI  
    if(hCallWnd[index]==NULL) ^.B `Z{Jb  
     continue; )yz9? ]a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J_)z:`[yE  
    { WL*W=(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $e^ :d  
     bProcessed=TRUE; M2;(+8 b  
    } ,T1XX2? :  
   } ~P_d0A~T  
  } N1B$G  
  else if((lParam&0xc000ffff)==1){ //有键按下 [0%Gu 5_\  
   switch(wParam) #RZJ1uL  
   { aL$c).hq0  
    case VK_MENU: *RqO3=  
     MaskBits|=ALTBIT; {{#a%O  
     break; !SD [6Z.R  
    case VK_CONTROL: !ktA"Jx  
     MaskBits|=CTRLBIT; faKrSmE!  
     break; kcZ;SYosj  
    case VK_SHIFT: Rqd%#v  
     MaskBits|=SHIFTBIT; +{ ,w#@  
     break; a5Acqa  
    default: //judge the key and send message U+3PqWB  
     break; xN":2qy#T  
   } ct|'I]nB.h  
   for(int index=0;index<MAX_KEY;index++){ n!E H>'T  
    if(hCallWnd[index]==NULL) D aqy+:  
     continue; f T+n-B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cq+M *1;  
    { ]$`s}BN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); o^"d2=  
     bProcessed=TRUE; 7l|>  
    } MjF.>4  
   } R4J>M@-0v  
  } C">=2OO  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 =-B3vd:LF  
   for(int index=0;index<MAX_KEY;index++){ Ot:\h  
    if(hCallWnd[index]==NULL) ztxQv5=:,  
     continue; FlA$G3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) VAB&&AL  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); h"Yqm"U/  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 N#6A>  
   } xuH<=-O>ki  
  } gQcr'[[a  
 } ,LW%'tQ~"  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); E'kQ  
} z$im4'\c  
O|g!Y(  
  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: *fy`JC  
F|ML$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); S:GUR6g8D  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C?c-V,  
p?gLW/n  
  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)G7 kB/<p  
SO jDtZ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) HjY-b*B  
{ dvdBRrf  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) DEeL 48{R  
 { !NY^(^   
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 5Vm}<8{  
  SaveBmp(); n N]vu  
  return FALSE; K]]r OF  
 } @p'v.;~#  
 …… //其它处理及默认处理 QbKYB  
} 4lKbw4[a  
.j4ziRa-  
]j#$.$q  
  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。 71 m-W#zyA  
!Z2n;.w  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 V6!73 iY  
gm8Tm$fY  
  二、编程步骤 e~~k}2~  
F vk: c-  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; X}QmeY[0I  
<rI$"=7  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; %T*+t"\)  
pvdZ>D-IU  
  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; PY:#F|uHS`  
=y(YMWGS  
  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;  !'t2  
3g "xm  
  5、 添加代码,编译运行程序。 - 5Wt9  
}8]uZ)[p=  
三、程序代码 .A[.?7g  
nv[Sb%/  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ,* vnt6C*  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) s3RyLT  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ '\mZ7.Jj  
#if _MSC_VER > 1000 9}Ave:X^  
#pragma once {3uSg)  
#endif // _MSC_VER > 1000 "RX5] eJc\  
#ifndef __AFXWIN_H__ iOXP\:mPo  
#error include 'stdafx.h' before including this file for PCH )Is*- W  
#endif |g^W @.P  
#include "resource.h" // main symbols ovoI~k'  
class CHookApp : public CWinApp eii7pbc  
{ RV*Zi\-X  
 public: PC7.+;1  
  CHookApp(); MAo,PiYb  
  // Overrides 5GxM?%\  
  // ClassWizard generated virtual function overrides `.-k%2?/  
  //{{AFX_VIRTUAL(CHookApp) [hj'Yg8{  
 public: Bw7:ry  
  virtual BOOL InitInstance(); %((3'le  
  virtual int ExitInstance(); K}(n;6\  
  //}}AFX_VIRTUAL F"P:9`/  
  //{{AFX_MSG(CHookApp) {:8[Mdf  
  // NOTE - the ClassWizard will add and remove member functions here. TUn@b11  
  // DO NOT EDIT what you see in these blocks of generated code ! %}5"5\Zz  
  //}}AFX_MSG $^aXVy5p  
  DECLARE_MESSAGE_MAP() Q+M3Pqy  
}; &Gwh<%=U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); T.dO0$,Q@$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ojqX#>0K  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #zD+DBTAu  
BOOL InitHotkey(); RtM.}wv;  
BOOL UnInit(); @Iatlz*W  
#endif 0x/V1?gm  
> V}NG  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. HON[{Oq  
#include "stdafx.h" 54j $A  
#include "hook.h" gbZX'D  
#include <windowsx.h> xEWa<P#.u  
#ifdef _DEBUG /7)G"qG~F~  
#define new DEBUG_NEW 7+-}8&s yu  
#undef THIS_FILE m:7bynT{  
static char THIS_FILE[] = __FILE__; 6FFv+{ 2^@  
#endif 9h=WWu',  
#define MAX_KEY 100 iW$i%`>  
#define CTRLBIT 0x04 RIc<  
#define ALTBIT 0x02 G ~\$Oq8  
#define SHIFTBIT 0x01 bFXCaD!{G  
#pragma data_seg("shareddata") 41D[[Gh  
HHOOK hHook =NULL; nu -wQr  
UINT nHookCount =0; HJrg  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey y>1 8)8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ;BvWU\!  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey /qze  
static int KeyCount =0; .}>[ Kr  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift (ajX ;/  
#pragma data_seg() /bk} J:QRg  
HINSTANCE hins; >R-$JrU.=  
void VerifyWindow(); t!N >0]:mo  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 39e oL;O_  
//{{AFX_MSG_MAP(CHookApp) Wm_-T]#_  
// NOTE - the ClassWizard will add and remove mapping macros here. ^O"`.2O1  
// DO NOT EDIT what you see in these blocks of generated code! `Yve  
//}}AFX_MSG_MAP 4D$E  
END_MESSAGE_MAP() Q+N @j]'  
Y" |U$  
CHookApp::CHookApp() w$HC!  
{ <[~M|OL9q,  
 // TODO: add construction code here, IrM3Uh  
 // Place all significant initialization in InitInstance gI{F"7fa=  
} `-2`UGB-  
QKQy)g  
CHookApp theApp; akwVU\RP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) PxY"{-iAM  
{ z [{%.kA  
 BOOL bProcessed=FALSE; ~!u94_:  
 if(HC_ACTION==nCode) ^PszZ10T  
 { -fn~y1  
  if((lParam&0xc0000000)==0xc0000000){// Key up ]7@Dqd-/S  
   switch(wParam) )[.URp&  
   { 8t; nU;E*  
    case VK_MENU: Jy$-)  
     MaskBits&=~ALTBIT; 5=e@yIr'#  
     break; c6.|; 4  
    case VK_CONTROL: <C(2(3  
     MaskBits&=~CTRLBIT; ,)8Hl[y  
     break; Hu.d^@V  
    case VK_SHIFT: a r%Rr"  
     MaskBits&=~SHIFTBIT; o*VQH`G*|g  
     break; y.OUn'^d4  
    default: //judge the key and send message $dVjxo  
     break; [rem,i+  
   } =*N(8j>y  
   for(int index=0;index<MAX_KEY;index++){ _uacpN/<|  
    if(hCallWnd[index]==NULL) @ZZ Lh=  
     continue; ymu#u   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p};<l@  
    { W'yICt(#G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); l-rI|0D#  
     bProcessed=TRUE; |ESe=G  
    } (>'d`^kjk  
   }  VPzdT*g]  
  } ZgtOy|?|  
  else if((lParam&0xc000ffff)==1){ //Key down wu3ZSLY  
   switch(wParam) B{<6 &bQ  
   { 14O/R3+  
    case VK_MENU: Dc5XU3Eu`  
     MaskBits|=ALTBIT; T%F'4_~No  
     break; gUl Z cb  
    case VK_CONTROL: E.brQx#}  
     MaskBits|=CTRLBIT; n$9!G  
     break; kQtl&{;k?  
    case VK_SHIFT: F u)7J4Z  
     MaskBits|=SHIFTBIT; p+Xz9A"  
     break; R8_qZ;t:z  
    default: //judge the key and send message !+U.)u9 '  
     break; w@R-@ G  
   } W%x#ps5%  
   for(int index=0;index<MAX_KEY;index++) ZO}*^  
   { Fej$`2mRH  
    if(hCallWnd[index]==NULL) z Ey&%Ok  
     continue; 9i@*\Ada  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w*x}4wW  
    { F);C?SW"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); b $!l* r  
     bProcessed=TRUE; Oi RqqD  
    } BL7%MvDQ  
   } O`4X[r1LD  
  } 6gn|WO=W f  
  if(!bProcessed){ <=lP6B  
   for(int index=0;index<MAX_KEY;index++){ !G37K8 &&*  
    if(hCallWnd[index]==NULL) gKnAw+u\  
     continue; OpfFF;"A'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) YN^8s  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); j"]%6RwM]  
   } t+ @F"[j  
  } 0Pe.G0 #  
 } j56Y,Tm  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #&^+hx|  
} uPpP")  
6+>rf{5P7  
BOOL InitHotkey() ;Ti?(n#M>  
{ `|4{|X*U.  
 if(hHook!=NULL){ K4~dEZ   
  nHookCount++; Sq,x@  
  return TRUE;  dbR4%;<  
 } 6 BMn7m?  
 else am=56J$ig  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); B dSTB"  
  if(hHook!=NULL) p<YO3@B+  
   nHookCount++; =e63>*M|  
  return (hHook!=NULL); & b%6pVj  
} Wr;)3K  
BOOL UnInit() gS!M7xy  
{ _oWenF  
 if(nHookCount>1){ rW6LMkt72  
  nHookCount--; QH;aJ(>$  
  return TRUE; jWQB~XQY  
 } cIH`,bR  
 BOOL unhooked = UnhookWindowsHookEx(hHook); MFVFr "  
 if(unhooked==TRUE){ '(Pbz   
  nHookCount=0; p^2pv{by  
  hHook=NULL; XHV+Y+VG  
 } RZ -w,~  
 return unhooked; 6eb5q/  
} e.Ii@<  
ZyTah\yPM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) IMBqy-q  
{ lD(d9GVm{z  
 BOOL bAdded=FALSE; X6PfOep  
 for(int index=0;index<MAX_KEY;index++){ U6{ RHS[  
  if(hCallWnd[index]==0){ IBR;q[Dj}  
   hCallWnd[index]=hWnd; k,H4<")H  
   HotKey[index]=cKey; wvfCj6}S &  
   HotKeyMask[index]=cMask; N24+P5  
   bAdded=TRUE; |Q$C%7  
   KeyCount++; )]>9\(  
   break; {^~{X$YI  
  } BD#4=u  
 } dK=BH=S2?X  
 return bAdded; r`5;G4UI  
} 0X@5W$x  
F"LT\7yjyG  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =%bc;ZUu  
{ lps  
 BOOL bRemoved=FALSE; 8`*(lKiL  
 for(int index=0;index<MAX_KEY;index++){ 4VK5TWg  
  if(hCallWnd[index]==hWnd){ $.`(2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ MtS$ovg?  
    hCallWnd[index]=NULL; SkxTgX5  
    HotKey[index]=0; ~j UK-E  
    HotKeyMask[index]=0; ?p`}6s Q}  
    bRemoved=TRUE; E3`KO'v%  
    KeyCount--; ~_K   
    break; Dq\#:NnKvx  
   } :D(:( `A=  
  } P0W%30Dh  
 }  X(bb1  
 return bRemoved; %o~zsIl  
} 0DN:{dJz  
 3o/f#y  
void VerifyWindow() uH`ds+Hp  
{ -WEiY  
 for(int i=0;i<MAX_KEY;i++){ z\fk?Tj<ro  
  if(hCallWnd!=NULL){ K^Xg^9  
   if(!IsWindow(hCallWnd)){ ;DGp7f#9  
    hCallWnd=NULL; ,u$$w  
    HotKey=0; p<Zf,F}  
    HotKeyMask=0; rq$%  
    KeyCount--; $UKDXQF"  
   } |>VHV} 4)<  
  } qWo|LpxWt  
 } DD;PmIW  
}  Vb/J`  
m|p}Jf!  
BOOL CHookApp::InitInstance() }V`Fz',lZ  
{ Q&wBX%@^L  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); S!rUdxO  
 hins=AfxGetInstanceHandle(); 3n X7$$X  
 InitHotkey(); =\`9\Gd  
 return CWinApp::InitInstance(); tr):n@  
} ao 32n  
C}45ZI4  
int CHookApp::ExitInstance() Rd2*  
{ 1V)0+_Yv  
 VerifyWindow(); Y8Mo.v  
 UnInit(); <&:3|2p  
 return CWinApp::ExitInstance(); \@5W&Be^  
} $U!w#|&  
N:=D@x~]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file d ;ry!X  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) e;Q~P]x  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ w:pc5N>we0  
#if _MSC_VER > 1000 NJn~XCq  
#pragma once gJ2R(YMF  
#endif // _MSC_VER > 1000 RL($h4d9  
9n$$D;  
class CCaptureDlg : public CDialog I4u'b?* je  
{ i;yz%Ug  
 // Construction -^C;WFh8)  
 public: #[J..i/h  
  BOOL bTray; K{HdqmxL.I  
  BOOL bRegistered; bvZmo zbD  
  BOOL RegisterHotkey(); }Dk_gom_  
  UCHAR cKey; L{aT"Of{X  
  UCHAR cMask; ^ .>)*P  
  void DeleteIcon(); %Sj;:LC  
  void AddIcon(); T- JJc#  
  UINT nCount; OG0ro(|dI  
  void SaveBmp(); 0M pX.0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 'v4AM@%u  
  // Dialog Data ~d28"p.7  
  //{{AFX_DATA(CCaptureDlg) }k'8*v}8  
  enum { IDD = IDD_CAPTURE_DIALOG }; HD Eqq  
  CComboBox m_Key; uI.4zbgl[  
  BOOL m_bControl; QiY7m<3  
  BOOL m_bAlt; tBdvk>d  
  BOOL m_bShift; erqg|TsFj  
  CString m_Path; $yRbo '-  
  CString m_Number; M=@U]1n*c  
  //}}AFX_DATA ==Ju2D?%  
  // ClassWizard generated virtual function overrides f'*HP%+Y  
  //{{AFX_VIRTUAL(CCaptureDlg) >[ywrB ?T  
 public: c~@I1M  
  virtual BOOL PreTranslateMessage(MSG* pMsg); U.d*E/OR5  
 protected: fFMG9]*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <[b\V+M  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 350y6pVh  
  //}}AFX_VIRTUAL 0s= GM|y  
  // Implementation wMei`svY  
 protected: Dr<%Lr  
  HICON m_hIcon; LTG/gif[u  
  // Generated message map functions H~&9xtuHN  
  //{{AFX_MSG(CCaptureDlg) h|_G2p^J+"  
  virtual BOOL OnInitDialog(); M`A bH19  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1 BVivEG  
  afx_msg void OnPaint(); ;z!~-ByzL  
  afx_msg HCURSOR OnQueryDragIcon(); 2x'JR yef  
  virtual void OnCancel(); to+jQ9q8  
  afx_msg void OnAbout(); 0G;RMR':5  
  afx_msg void OnBrowse(); n8J';F =P  
  afx_msg void OnChange(); [96|xe\s  
 //}}AFX_MSG 7?b'"X"  
 DECLARE_MESSAGE_MAP() K@%.T#  
}; 6<FJ`l]U9  
#endif E9QNx6 2  
7vgz=- MZ#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file dEns|r  
#include "stdafx.h" =OTwP  
#include "Capture.h" }4\>q$8'  
#include "CaptureDlg.h" X=_N7!  
#include <windowsx.h> ;\( wJ{u?Y  
#pragma comment(lib,"hook.lib") ,c}Q;eYc3  
#ifdef _DEBUG `<q{8  
#define new DEBUG_NEW ^P(HX  
#undef THIS_FILE Wv$e/N`l  
static char THIS_FILE[] = __FILE__; G,$RsP  
#endif GiI2nHZc  
#define IDM_SHELL WM_USER+1 c7'I'~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); q48V|6X'q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6d`6=D:  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 7_n@iUG2n  
class CAboutDlg : public CDialog M {_`X  
{ *}cF]8c5W  
 public: MZ6?s(mkx  
  CAboutDlg(); .,UpI|b  
  // Dialog Data rEz=\yY^j'  
  //{{AFX_DATA(CAboutDlg) W/xb[w9v  
  enum { IDD = IDD_ABOUTBOX }; l\jf]BHX'  
  //}}AFX_DATA h,0mJj-ma  
  // ClassWizard generated virtual function overrides *_3+ DF  
  //{{AFX_VIRTUAL(CAboutDlg) /k(0}g=\  
 protected: :1=mNrg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Jc:*X4-'  
  //}}AFX_VIRTUAL .Mdxbs6.C  
  // Implementation [u=b[(  
 protected: -i7W|X"  
  //{{AFX_MSG(CAboutDlg) 4:5CnK  
  //}}AFX_MSG Mryi6XT  
  DECLARE_MESSAGE_MAP() i{!i %`"  
}; \} P}H  
OT\[qaK  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) zT`LPs6T  
{ l^WFMeMD3a  
 //{{AFX_DATA_INIT(CAboutDlg) , B h[jb`y  
 //}}AFX_DATA_INIT )# M*@e$k  
} Ga"$_DyM  
2U)H2 %  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) k g0Z(T:&8  
{ 'l!tQD!  
 CDialog::DoDataExchange(pDX); ,z<\Z!+=  
 //{{AFX_DATA_MAP(CAboutDlg) %)u5A !"  
 //}}AFX_DATA_MAP \c_1uDRoUn  
} Hq< Vk.Nk  
SPn0D9 b]  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) g_5:o 3s  
 //{{AFX_MSG_MAP(CAboutDlg) +mYD DlvI  
 // No message handlers N@)tU;U3O  
 //}}AFX_MSG_MAP zf4@:GM`  
END_MESSAGE_MAP() &=xm>;`3  
;HgV(d#X  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) owJPEx  
: CDialog(CCaptureDlg::IDD, pParent) LezM=om.  
{ ie=tM'fb  
 //{{AFX_DATA_INIT(CCaptureDlg) iw12x:  
  m_bControl = FALSE; a<rk'4,8a  
  m_bAlt = FALSE; sn]8h2z  
  m_bShift = FALSE; iK s/8n  
  m_Path = _T("c:\\"); Nq"/:3@4  
  m_Number = _T("0 picture captured."); xW#r)aN]p  
  nCount=0; 2_R' Kl![  
  bRegistered=FALSE; N?ky2wG  
  bTray=FALSE; 8 U B?X  
 //}}AFX_DATA_INIT =VH, i/@  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9Psy$  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); m+s^K{k}  
} htq#( M  
KaZ$!JfT  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 3z!\Z[  
{ BJ@tU n  
 CDialog::DoDataExchange(pDX); K9;pX2^z9  
 //{{AFX_DATA_MAP(CCaptureDlg) 8m2-fuJz  
  DDX_Control(pDX, IDC_KEY, m_Key); =ugxPgn  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); #,0%g 1  
  DDX_Check(pDX, IDC_ALT, m_bAlt); a)`b;]+9  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 0' @^PzX  
  DDX_Text(pDX, IDC_PATH, m_Path); ~ubGx  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ix=HLF-0zC  
 //}}AFX_DATA_MAP @c9VCG D  
} >s1'I:8  
"'~'xaU!=a  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) JD^(L~n]  
//{{AFX_MSG_MAP(CCaptureDlg) '@3hU|jO!  
 ON_WM_SYSCOMMAND() wh<+.Zp  
 ON_WM_PAINT() !gWV4vC  
 ON_WM_QUERYDRAGICON() eZ(<hE>  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) {r#2X1  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) e@Q<hb0<eU  
 ON_BN_CLICKED(ID_CHANGE, OnChange) tT ~}lW)Y  
//}}AFX_MSG_MAP `Jq ?+W  
END_MESSAGE_MAP() tq8B)<(]  
NU-({dGK}  
BOOL CCaptureDlg::OnInitDialog() ik=~`3Zp0  
{ S ])Ap'E  
 CDialog::OnInitDialog(); D ?1$I0=  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); xVao3+r  
 ASSERT(IDM_ABOUTBOX < 0xF000); L6fc_Mo.EE  
 CMenu* pSysMenu = GetSystemMenu(FALSE); b?hdWQSW7  
 if (pSysMenu != NULL) 7q<I7Wt  
 { QU2\gAM  
  CString strAboutMenu; np}F [v  
  strAboutMenu.LoadString(IDS_ABOUTBOX); T9osueh4  
  if (!strAboutMenu.IsEmpty()) !=;^Grv>  
  { }H&NR?Ax  
   pSysMenu->AppendMenu(MF_SEPARATOR); Tar tV3;`  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (`>RwooE  
  } %K@D{ )r_^  
 } G9TK)Nz  
 SetIcon(m_hIcon, TRUE); // Set big icon 2M3.xUS  
 SetIcon(m_hIcon, FALSE); // Set small icon ++W_4 B!  
 m_Key.SetCurSel(0); (Eq0 |"cj  
 RegisterHotkey(); bJj <xjBM  
 CMenu* pMenu=GetSystemMenu(FALSE); p6$ QTx  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); TL ;2,@H`  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); HF" v \  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); a;|C51GH  
 return TRUE; // return TRUE unless you set the focus to a control 7SE\(K=<%  
} I83ZN]  
#/Y t4n  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) AF g*  
{ w4H3($ K  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) _Pjo9z 9  
 { ( 1T2? mO  
  CAboutDlg dlgAbout; qba<$  
  dlgAbout.DoModal(); T]l_B2.  
 } yd2v_  
 else 3/RmJ `c{  
 { ;aExEgTq  
  CDialog::OnSysCommand(nID, lParam); lJP6s k  
 } aL$m  
} h?jy'>T?b2  
`VCU`Y  
void CCaptureDlg::OnPaint() DBYD>UA  
{ x_CB'Rr6  
 if (IsIconic()) (.-3q;)6  
 { % < D  
  CPaintDC dc(this); // device context for painting OM*N)*  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ;Y5"[C9|  
  // Center icon in client rectangle _I l/ i&  
  int cxIcon = GetSystemMetrics(SM_CXICON); 3/+9#  
  int cyIcon = GetSystemMetrics(SM_CYICON); QkBT, c  
  CRect rect; .|}ogTEf  
  GetClientRect(&rect); PdcF  
  int x = (rect.Width() - cxIcon + 1) / 2; p&ytUT na  
  int y = (rect.Height() - cyIcon + 1) / 2; 8'Sw?FbVA/  
  // Draw the icon .%j&#(!  
  dc.DrawIcon(x, y, m_hIcon); ?sWPx!tU  
 } r+-KrO'  
 else R| [mp%Q  
 { Y [k%<f  
  CDialog::OnPaint(); rs2G{a  
 } JG @bl  
} rT9<_<  
uUu]JDdz  
HCURSOR CCaptureDlg::OnQueryDragIcon() v _?0|Ei[  
{ y Dg  
 return (HCURSOR) m_hIcon; A rC4pT   
} ,7,x9qE"  
'yxRz5  
void CCaptureDlg::OnCancel() O3WhO@`6)  
{ 0Aw.aQ~E8i  
 if(bTray) :SUPGaUJ"  
  DeleteIcon(); 0 Po",\^  
  CDialog::OnCancel(); 4vKp341B  
} _\waA^ F  
-Zc 6_]F|  
void CCaptureDlg::OnAbout() RL7OFfMe  
{ 6C@,&2<yK  
 CAboutDlg dlg; Jy?s'tc  
 dlg.DoModal(); YzJ\< tkp  
} _Bm/v^(  
L"6qS3[=  
void CCaptureDlg::OnBrowse() NPy{ =#k4  
{ y33+^  
 CString str; RO?5WJpPj  
 BROWSEINFO bi; :bFCnV`Q  
 char name[MAX_PATH]; 3qU#Rg ;7  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); q'~ ?azg:  
 bi.hwndOwner=GetSafeHwnd(); H~UxVQLPp  
 bi.pszDisplayName=name; Njsz=  
 bi.lpszTitle="Select folder"; Tn2nd  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; >fRI^Q,  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Q/&H3N  
 if(idl==NULL) ~`)`Ip  
  return; ( P|Ph  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 9,wd,,ta  
 str.ReleaseBuffer(); n*~=O'  
 m_Path=str; W<C \g~\  
 if(str.GetAt(str.GetLength()-1)!='\\') ,DsqKXSU  
  m_Path+="\\"; rKEi1b  
 UpdateData(FALSE); +>mbBu!7  
} Lsv[@Rl  
]Tk3@jw+b  
void CCaptureDlg::SaveBmp() #ky]@vyO  
{ I:l<t*  
 CDC dc; 2Pn  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); /T&z :st0  
 CBitmap bm; TD:NL4dm  
 int Width=GetSystemMetrics(SM_CXSCREEN); |;3Ru vX?+  
 int Height=GetSystemMetrics(SM_CYSCREEN); Lh.?G#EM  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ?;Dh^mc  
 CDC tdc; /4{ 6`  
 tdc.CreateCompatibleDC(&dc); 'X&sH/>r  
 CBitmap*pOld=tdc.SelectObject(&bm); YCZl1ry:V=  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); cr Hd$~q,  
 tdc.SelectObject(pOld); o&}!bq]  
 BITMAP btm; dx}) 1%  
 bm.GetBitmap(&btm); )HbsUm#  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; $GhdH)  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); F0h`>{1%  
 BITMAPINFOHEADER bih; rmXxid  
 bih.biBitCount=btm.bmBitsPixel; ;BzbWvBo  
 bih.biClrImportant=0; FG]xn(E  
 bih.biClrUsed=0; `t_S uZ`V  
 bih.biCompression=0; u:#+R_0#97  
 bih.biHeight=btm.bmHeight; 1%~yb Q  
 bih.biPlanes=1; 'F>eieO  
 bih.biSize=sizeof(BITMAPINFOHEADER); H0<(j(JK  
 bih.biSizeImage=size; |>o]+V  
 bih.biWidth=btm.bmWidth; Tbv", b  
 bih.biXPelsPerMeter=0; >PdYQDyVS  
 bih.biYPelsPerMeter=0; >xQgCOi  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); X+zFRL%  
 static int filecount=0; tSX<^VER7  
 CString name; % C~2k?  
 name.Format("pict%04d.bmp",filecount++); ~ED8]*H|`  
 name=m_Path+name; |"h# Q[3  
 BITMAPFILEHEADER bfh; 0G`_dMN  
 bfh.bfReserved1=bfh.bfReserved2=0; Y"~Tf{8  
 bfh.bfType=((WORD)('M'<< 8)|'B'); j9"uxw@  
 bfh.bfSize=54+size; e0iE6:i  
 bfh.bfOffBits=54; ( HCB\!g  
 CFile bf; wGdnv}#  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ {(;dHF%{  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); mLApF5Hy  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); LVNq@,s  
  bf.WriteHuge(lpData,size); wG;#L7%  
  bf.Close(); H]&a}WQ_  
  nCount++; &4 Py  
 } / blVm1F  
 GlobalFreePtr(lpData); YjaEKM8*  
 if(nCount==1) (B|4wR\  
  m_Number.Format("%d picture captured.",nCount); 4CA(` _i~  
 else '.Iz*%"  
  m_Number.Format("%d pictures captured.",nCount); /@Qg'Q#  
  UpdateData(FALSE); -6lsR  
} (iub\`  
?+#|h;M8  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) IvuKpX>*  
{ ny# ?^.1  
 if(pMsg -> message == WM_KEYDOWN) }  IJ  
 { 9))E\U  
  if(pMsg -> wParam == VK_ESCAPE) <vxj*M;  
   return TRUE; 7)&}riQ  
  if(pMsg -> wParam == VK_RETURN) Q72}V9I9  
   return TRUE; %:i; eUKR  
 } ]7<}EG  
 return CDialog::PreTranslateMessage(pMsg); e8T#ZWr*  
} o!:V=F  
>YP6/w,e  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) I(LBc  
{ h| q!Qsnj'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ w`_cmI  
  SaveBmp(); K_/-mwA v  
  return FALSE; P$LHsg]  
} o,o,(sII  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 9G njJ  
 CMenu pop; hP1}Do  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1aEM&=h_W  
 CMenu*pMenu=pop.GetSubMenu(0); *sNZ.Y:.  
 pMenu->SetDefaultItem(ID_EXITICON); yB][ 3?lv  
 CPoint pt; /ZC/yGdIS_  
 GetCursorPos(&pt); -L%J,f[&,  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); /.PjHTM<  
 if(id==ID_EXITICON) Gk~QgD/Pix  
  DeleteIcon(); p4l^b[p  
 else if(id==ID_EXIT) YrlOvXW  
  OnCancel(); "^sh:{  
 return FALSE;  zxN,ys  
} cuv?[ M  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); kU uDA><1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) +/!kL0[v  
 AddIcon(); LxD >eA  
 return res; wHneVqI/U  
} \HR<^xY  
"},0Cs  
void CCaptureDlg::AddIcon() ODS8bD0!i  
{ vo48\w7[  
 NOTIFYICONDATA data; h#_KO-#.[  
 data.cbSize=sizeof(NOTIFYICONDATA); `re9-HM  
 CString tip; *Uq1 q  
 tip.LoadString(IDS_ICONTIP); 0 #*M'C#  
 data.hIcon=GetIcon(0); \#1*r'V8  
 data.hWnd=GetSafeHwnd(); ]/byz_7]  
 strcpy(data.szTip,tip); >`\f,yq l6  
 data.uCallbackMessage=IDM_SHELL; ahezDDR-.i  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 21(8/F ~{  
 data.uID=98; hC1CISm.U  
 Shell_NotifyIcon(NIM_ADD,&data); zJ-_{GiM*L  
 ShowWindow(SW_HIDE); o }EipTL  
 bTray=TRUE; SePPI.n  
} j?!BHNs  
KDx~^OO  
void CCaptureDlg::DeleteIcon()  :{#%_^}k  
{ \}CQo0v  
 NOTIFYICONDATA data; :X1~  
 data.cbSize=sizeof(NOTIFYICONDATA); ZUDdLJ  
 data.hWnd=GetSafeHwnd(); 2t9JiH  
 data.uID=98; lr >:S  
 Shell_NotifyIcon(NIM_DELETE,&data); Xz/5 Wis4  
 ShowWindow(SW_SHOW); z^@.b  
 SetForegroundWindow(); IZr~h9  
 ShowWindow(SW_SHOWNORMAL); [VvTR#^  
 bTray=FALSE; 7d9kr?3(U  
} &G#LQl  
cvoE4&m!  
void CCaptureDlg::OnChange() T6T3:DG_B  
{ px|y_.DB2x  
 RegisterHotkey(); PKDzIA~T  
} x#wkODLqi  
5U%J,W  
BOOL CCaptureDlg::RegisterHotkey() b=V"$(Q  
{ , 7` /D  
 UpdateData(); X5s.F%Np!  
 UCHAR mask=0; &Z kY9XO  
 UCHAR key=0; JCL+uEX4S  
 if(m_bControl) h6Femis  
  mask|=4; /(/Z~J[  
 if(m_bAlt) U<T.o0s=  
  mask|=2; )Dg;W6  
 if(m_bShift) .Vohd@s9l  
  mask|=1; "nkj_pC  
  key=Key_Table[m_Key.GetCurSel()]; 0Dx,)C  
 if(bRegistered){ {2|[7oNT6  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask);  z]/;?  
  bRegistered=FALSE; j41)X'MgJ  
 } {zTo[i  
 cMask=mask; B8XW+U  
 cKey=key; ld RV JVZc  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); " Bz\<e&u  
 return bRegistered; R`IFKmA EJ  
} +XaRwcLC.  
ySfot`LQ  
  四、小结 [r[IWy(}  
.f1  
  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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