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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: YW7b)u Yf  
  @Y1s$,=xB  
  一、实现方法 h*-Pr8  
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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: Oil?JI Hq  
euC&0Ee2  
#pragma data_seg("shareddata") Hv2De0W  
HHOOK hHook =NULL; //钩子句柄 uD^cxD  
UINT nHookCount =0; //挂接的程序数目 yU9DSY\m{  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Z<vKQ4 G  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 {WYX~Mvvj  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ZpnxecJUJ  
static int KeyCount =0; Za 1QC;7  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 r-Pkfy(  
#pragma data_seg() H '  
UEguF &  
  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。 ljb7oA3cP4  
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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: m6w].-D8  
p>4-s, W  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 9Gnc9_]I;W  
cKey,UCHAR cMask) #`)(e JF  
{ b:TLV`>/&  
 BOOL bAdded=FALSE; !qWH`[:  
 for(int index=0;index<MAX_KEY;index++){ `hQ5VJo  
  if(hCallWnd[index]==0){ Fvbh\m ~  
   hCallWnd[index]=hWnd; 4rLL[??  
   HotKey[index]=cKey; R^Y <RI  
   HotKeyMask[index]=cMask; |&zz,+E  
   bAdded=TRUE; ee^{hQi  
   KeyCount++; i%0ur}p  
   break; :51/29}  
  } g\&g N  
 } K1M%!JKh)x  
 return bAdded; AJF#Aw `o  
} 2Eu`u!jhx  
//删除热键 f=WDR m]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0"f\@8r(  
{ G;l_|8<t#\  
 BOOL bRemoved=FALSE; sM `DL  
 for(int index=0;index<MAX_KEY;index++){ x8V('`}j  
  if(hCallWnd[index]==hWnd){ $xPaYf  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ H" 3fT0  
    hCallWnd[index]=NULL; ZZzMO6US0  
    HotKey[index]=0; pC@{DW;V6R  
    HotKeyMask[index]=0; {#@W)4)cA  
    bRemoved=TRUE; woK&q7Vn  
    KeyCount--; RO'7\xvn  
    break; 8~@c)Z;  
   } Na]:_K5Dp  
  } Yp^rR }N  
 } +[\FD; >  
 return bRemoved; a6)BqlJ  
} ]1#e#M]#  
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~E2KZm  
  DLL中的钩子函数如下: lww!-(<ww  
rWR}Stc@]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7%x[q}  
{ qKr8)}h  
 BOOL bProcessed=FALSE; ~d|A!S`  
 if(HC_ACTION==nCode)  +|n*b  
 { JR@`2YP-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 hG12ZZD  
   switch(wParam) /rnu<Q#iH  
   {  f'EuY17w  
    case VK_MENU: l 3ko?k  
     MaskBits&=~ALTBIT; -z)n?(pftm  
     break; 8c9*\S  
    case VK_CONTROL: _x(o*v[Pt  
     MaskBits&=~CTRLBIT; __G?0*3G  
     break; &m)6J'q3k  
    case VK_SHIFT: )<h*eS{  
     MaskBits&=~SHIFTBIT; R6;=n"Ueb  
     break; >4TaP*_  
    default: //judge the key and send message K8GP@yD]M  
     break; nxnv,AZG  
   } W{6|tx)  
   for(int index=0;index<MAX_KEY;index++){ Y 5- F@(  
    if(hCallWnd[index]==NULL) \/zq7j  
     continue; YIQ 4t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e> e}vZlX  
    { @#T|Y&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @tNzQ8  
     bProcessed=TRUE; R;uvkg[o  
    } 8]/bK5`  
   } _E@2ZnD2  
  } _=F=`xu  
  else if((lParam&0xc000ffff)==1){ //有键按下 cPyE 6\lN  
   switch(wParam) X86O lP)eX  
   { -*Xa3/kQ  
    case VK_MENU: e>+i>/Fn{h  
     MaskBits|=ALTBIT; 3no%E03p  
     break; `T@i.'X  
    case VK_CONTROL: u8&Z!p\  
     MaskBits|=CTRLBIT; i&bA2p3+d  
     break; +hg3I8q:  
    case VK_SHIFT: fg_4zUGM+g  
     MaskBits|=SHIFTBIT; .,<1%-R34q  
     break; 6-N?mSQU  
    default: //judge the key and send message 6F!+T=  
     break; xpV|\2C  
   } 4&<oFW\r  
   for(int index=0;index<MAX_KEY;index++){ i [7\[  
    if(hCallWnd[index]==NULL) ^}/PGG\~r  
     continue; le|~BG hL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 89pEfl j2  
    { %g{X?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); h7G"G"  
     bProcessed=TRUE; V_ :1EBzz  
    } 4;e5H_}Oo  
   } p& y<I6a,  
  } AYqX |  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ey7 f9  
   for(int index=0;index<MAX_KEY;index++){ +h|`/ &,  
    if(hCallWnd[index]==NULL) %(3|R@G.  
     continue; +"\sc;6m.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) P+@/O  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); t<.)Z-Ii  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 36}?dRw#p  
   } o4G?nvK-  
  } X`kk]8 =  
 } lA| 5E?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); V#2+"(7h  
} O,{6*[)@  
6M @[B|Q(  
  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: Ra)3+M!x  
Y2N>HK0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?PuBa`zDE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '}ptj@,  
] {RDVA=]  
  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: ;w{tv($$  
T"{>t  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) '.IW.{;$  
{ #++lg{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) s Ep"D+f  
 { R1adWBD>  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 PCHu #5j_a  
  SaveBmp(); DU0zez I9  
  return FALSE; M'?,] an  
 } "h{q#~s  
 …… //其它处理及默认处理 kj#?whK6~  
} v|XTr,#  
GFj{K  
=)0,#9k U]  
  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。 }NHaCG[,  
%<\vGqsM  
  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。 mitHT :%r2  
h]IxXP?h[  
  二、编程步骤 1OGx>J6  
sXLq*b?  
  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"; ^bGNq X  
LM:vsG  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ]R+mKUZ9  
{2O1"|s ,  
  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; gh/EU/~d  
/hr7NT{e%v  
  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; hQ,ch[j'  
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  5、 添加代码,编译运行程序。 ity & v 9  
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三、程序代码 C)um9}  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5V?& 8GTe  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) {% rA1g  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ F&!6jv  
#if _MSC_VER > 1000 B~1 _28\  
#pragma once j8v8uZ;x  
#endif // _MSC_VER > 1000 >8~.wXyoC  
#ifndef __AFXWIN_H__ &jS>UsGh  
#error include 'stdafx.h' before including this file for PCH z Xg3[orF  
#endif |XaIx#n  
#include "resource.h" // main symbols C.WX.Je  
class CHookApp : public CWinApp ~Otq %MQ  
{ #{\J Nb+w%  
 public: h9t$Uz^N  
  CHookApp(); R3 -n>V5o  
  // Overrides k0OYJ/  
  // ClassWizard generated virtual function overrides Y+kfBvxyf  
  //{{AFX_VIRTUAL(CHookApp) -$pzl,^ h  
 public: aB_F9;IR  
  virtual BOOL InitInstance(); EuZ<quwWg  
  virtual int ExitInstance(); @:oXN]+ _  
  //}}AFX_VIRTUAL Ot4 Z{mA  
  //{{AFX_MSG(CHookApp) b)6D_Az7c  
  // NOTE - the ClassWizard will add and remove member functions here. :y'Ah#  
  // DO NOT EDIT what you see in these blocks of generated code ! v"y-0$M  
  //}}AFX_MSG JA %J$d  
  DECLARE_MESSAGE_MAP() 52@C9Q,  
}; ]i|h(>QWP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); rJ`!:f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); p)KheLiZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &y\prip  
BOOL InitHotkey(); 1h^:[[!c  
BOOL UnInit(); m]'#t)B_m  
#endif "IZa!eUW  
0pZ4BZdT|  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. {j{u6i  
#include "stdafx.h" ;;!yC  
#include "hook.h" $h+1u$po  
#include <windowsx.h> J4k=A7^N  
#ifdef _DEBUG 2":pE U{E  
#define new DEBUG_NEW ~ 8PZ5;g  
#undef THIS_FILE u }#(.)a:  
static char THIS_FILE[] = __FILE__; 1vS#K=sb  
#endif >@U*~Nz  
#define MAX_KEY 100 ] ]u s %  
#define CTRLBIT 0x04 1auIR/=-  
#define ALTBIT 0x02 KI.q@zO6|  
#define SHIFTBIT 0x01 6/f7<  
#pragma data_seg("shareddata") QJZK|*  
HHOOK hHook =NULL; qLO4#CKCL6  
UINT nHookCount =0; +jAGGv^)  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey R4[N:~Z$|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT oI?3<M^  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey S(k3 `;K  
static int KeyCount =0; .yMEIUm  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift OC_+("N  
#pragma data_seg() ~k"=4j9  
HINSTANCE hins; piJu+tUy  
void VerifyWindow(); ~Q Oe##  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) h){0rX@:&  
//{{AFX_MSG_MAP(CHookApp) @D]5civm_  
// NOTE - the ClassWizard will add and remove mapping macros here. ^ sOQi6pL  
// DO NOT EDIT what you see in these blocks of generated code! X1DF*wI  
//}}AFX_MSG_MAP &xU[E!2H%  
END_MESSAGE_MAP() .6ylZ  
(9tX5$e6N  
CHookApp::CHookApp() +vw\y  
{ 3$9s\<j  
 // TODO: add construction code here, >f|||H}Snw  
 // Place all significant initialization in InitInstance Yz'K]M_Dq  
} |'e^QpU5  
o8 IL $:  
CHookApp theApp; ;(b9#b.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !eGC6o}f  
{ #QS`_TlKk  
 BOOL bProcessed=FALSE; 9Uh"iMB  
 if(HC_ACTION==nCode) 7!e vm;A  
 { ZFi ee|,q  
  if((lParam&0xc0000000)==0xc0000000){// Key up *1ilkmL%  
   switch(wParam) >,v`EIg  
   { eln)BW#  
    case VK_MENU: HSw;^E)1  
     MaskBits&=~ALTBIT; [ZNtCnv  
     break; FVMD>=k  
    case VK_CONTROL: b10cuy|a/X  
     MaskBits&=~CTRLBIT; tl[Uw[  
     break; P:hBt\5B  
    case VK_SHIFT: <kfnpB=  
     MaskBits&=~SHIFTBIT; ({ +!`}GY  
     break; /?wtF4  
    default: //judge the key and send message X1:V<,}"  
     break; 1;JEc9# h  
   } l94b^W}1)W  
   for(int index=0;index<MAX_KEY;index++){ 1ufp qqk  
    if(hCallWnd[index]==NULL) J9..P&c\  
     continue; ISzqEi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $6#CqWhI  
    { L,HhbTRca  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Je';9(ZK  
     bProcessed=TRUE; gl~ecc  
    }  Z< 1  
   } rbul8(1h  
  } !-g{[19\  
  else if((lParam&0xc000ffff)==1){ //Key down ]dF ,:8  
   switch(wParam) 9G9t" {  
   { ?L x24*5%  
    case VK_MENU:  |{&{  
     MaskBits|=ALTBIT; ~b(i&DVK  
     break; ;p.v]0]is  
    case VK_CONTROL: bc*X/).  
     MaskBits|=CTRLBIT; <NHH^M\N  
     break; R$EW4]j  
    case VK_SHIFT: DMs,y{v  
     MaskBits|=SHIFTBIT; b k~( ^!R  
     break; Oylf<&knF\  
    default: //judge the key and send message %9 SJ E  
     break; #9=Vg  
   } '%>=ZhO  
   for(int index=0;index<MAX_KEY;index++) W4 t;{b  
   { 2_)\a(.Qu  
    if(hCallWnd[index]==NULL) {WJm  
     continue; G5{T5#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xv46r=>  
    { O8f?; ]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); m\;R2"H%  
     bProcessed=TRUE; M+-*QyCFK  
    } &C:IX\  
   } ZVW'>M7.  
  } O6@j &*jS  
  if(!bProcessed){ QER?i;-wb  
   for(int index=0;index<MAX_KEY;index++){ e*sfPHt  
    if(hCallWnd[index]==NULL) dLH(D: `  
     continue; |O3q@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 9U7nKJ+iby  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); UJ%R   
   } ;$HftG>B  
  } aasoW\UG  
 } 3N 8t`N  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6d:zb;Iz  
} S2E8G q9  
rDl*d`He!  
BOOL InitHotkey() 4"GR] X  
{ y@1+I ~@  
 if(hHook!=NULL){ >d@&2FTO  
  nHookCount++; uMUBh 80,L  
  return TRUE; 9X[kEl  
 } u\a#{G;Z  
 else r+'qd)  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); w!#tTyk`  
  if(hHook!=NULL) "_P;2N6  
   nHookCount++; AJt+p&I[J  
  return (hHook!=NULL); `K*Q5n  
} Qd)q([  
BOOL UnInit() uOKCAqYa  
{ zy?.u.4L  
 if(nHookCount>1){ N%kt3vmQ_  
  nHookCount--; zofa-7'Bn  
  return TRUE; toLV4BtIG  
 } hZdoc<  
 BOOL unhooked = UnhookWindowsHookEx(hHook); `CBZhI%%  
 if(unhooked==TRUE){ "/yC@VC>  
  nHookCount=0; !1rlN8w(qr  
  hHook=NULL; ^/uA?h:]\  
 } ~3^ 8>d/  
 return unhooked; YD <:,|H   
} i1UiNJh86  
vGvf<ra;H  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^/)^7\@  
{ d^@dzNv  
 BOOL bAdded=FALSE; I?]ohG K  
 for(int index=0;index<MAX_KEY;index++){ @#<D ^"  
  if(hCallWnd[index]==0){ Wfu(*  
   hCallWnd[index]=hWnd; '>NCMB{*  
   HotKey[index]=cKey; y?rPlA_  
   HotKeyMask[index]=cMask; \j+1V1t9  
   bAdded=TRUE; |<HPn4 ,X  
   KeyCount++; wYd b*"R  
   break; QFE:tBHe  
  } 6O|@xvg  
 } vhe>)h*B  
 return bAdded; 7z/|\D_{  
} ?OId\'q  
O $LfuL  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) rr+|Zt Y  
{ V n7*JS  
 BOOL bRemoved=FALSE; vV6<^ W:9F  
 for(int index=0;index<MAX_KEY;index++){ Sw:7pByjI  
  if(hCallWnd[index]==hWnd){ ? 8)'oMD  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Hek*R?M|  
    hCallWnd[index]=NULL; 0[A[U_b  
    HotKey[index]=0; t=rEt>n~L  
    HotKeyMask[index]=0; mkMq  
    bRemoved=TRUE; yu;+o3WlK  
    KeyCount--; t!*?dr  
    break; kv]~'Srk  
   } Z"Zmo>cV4  
  } %huRsQ %}  
 } +Um( h-;  
 return bRemoved; t,QyfN  
} 9l|@v=gw.  
6TYY UM"&  
void VerifyWindow() b $'FvZbk  
{ ydFD!mO  
 for(int i=0;i<MAX_KEY;i++){ VA WF3  
  if(hCallWnd!=NULL){ 83E7k]7]  
   if(!IsWindow(hCallWnd)){ uya.sF0]9B  
    hCallWnd=NULL; ;l4[%xld  
    HotKey=0; ATJWO 1CtB  
    HotKeyMask=0; XO`0>^g  
    KeyCount--; dpJ_r>NI  
   } 3Iua*#<m,  
  } ? Fi=P#  
 } u_hD}V^x4  
} b+,' ;bW  
Mxe}B'  
BOOL CHookApp::InitInstance() 5G::wuxk  
{ S-P/+K6  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); e_#._Pi  
 hins=AfxGetInstanceHandle(); 7_%"BVb"  
 InitHotkey(); {`J)j6;  
 return CWinApp::InitInstance(); Hv!U| L  
} `lQ3C{}  
$Oq^jUJ  
int CHookApp::ExitInstance() 5)FJ:1-  
{ i;]"n;>+/  
 VerifyWindow(); {,3>"  
 UnInit(); T3~k>"W  
 return CWinApp::ExitInstance(); 11TL~ xFh  
} ~kQA7;`j$  
~s% Md  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file q_TR q:&.  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) MTsM]o  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ?: N @!jeJ  
#if _MSC_VER > 1000 Hx#;Z  
#pragma once ?!;7:VIE  
#endif // _MSC_VER > 1000 `rgn<I"  
RzBF~2 >i  
class CCaptureDlg : public CDialog _XG/Pp)  
{ XDsx3Ws  
 // Construction &{ay=Mj  
 public: LISM ngQ.  
  BOOL bTray; 'L 8n-TyL  
  BOOL bRegistered; }&/o'w2wY  
  BOOL RegisterHotkey(); t5[ #x4 p  
  UCHAR cKey; ;fsZ7k4]do  
  UCHAR cMask; GO8GJ;B-U  
  void DeleteIcon(); K17j$o^6KK  
  void AddIcon(); , 0imiv  
  UINT nCount; $@"l#vJPfc  
  void SaveBmp(); GYJ80k|  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 8s"%u )  
  // Dialog Data uZM{BgXXD  
  //{{AFX_DATA(CCaptureDlg) 4NGA/ G  
  enum { IDD = IDD_CAPTURE_DIALOG }; fhar&\;S  
  CComboBox m_Key; /h+8A' ,  
  BOOL m_bControl; s1=X>'q  
  BOOL m_bAlt; :QpuO1Gu  
  BOOL m_bShift; ^?U!pq -`  
  CString m_Path; q ]M+/sl  
  CString m_Number; 61. Brp.eP  
  //}}AFX_DATA J!0DR4=Xi  
  // ClassWizard generated virtual function overrides !6BW@GeF]  
  //{{AFX_VIRTUAL(CCaptureDlg) :ZTc7 }  
 public: "7!;KHc  
  virtual BOOL PreTranslateMessage(MSG* pMsg); K#EvFs`s;  
 protected: 'd.EC#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  5V6G=H  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); pNOwDJtK  
  //}}AFX_VIRTUAL qC}-_u7s  
  // Implementation DBPRGQ  
 protected: y&Mr=5:y  
  HICON m_hIcon; W{%TlN  
  // Generated message map functions )\_:{c  
  //{{AFX_MSG(CCaptureDlg) f%Ns[S~r  
  virtual BOOL OnInitDialog(); _jJPbKz  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); q;QbUO  
  afx_msg void OnPaint(); d`P7}*; `  
  afx_msg HCURSOR OnQueryDragIcon(); {6"Ph(I1  
  virtual void OnCancel(); "{tg8-a4)  
  afx_msg void OnAbout(); eAXc:222  
  afx_msg void OnBrowse(); v\!Be[ ?  
  afx_msg void OnChange(); Y]NSN-t  
 //}}AFX_MSG \]&#%6|V  
 DECLARE_MESSAGE_MAP() qDv93  
}; 9F4Dm*_<  
#endif <\Eh1[F  
'ixwD^x  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ERpnuMb  
#include "stdafx.h" l ;JA8o\x  
#include "Capture.h" crqpV F]1]  
#include "CaptureDlg.h" V=zi >o`   
#include <windowsx.h> %1H[Wh(U  
#pragma comment(lib,"hook.lib") 33#0J$j7  
#ifdef _DEBUG &{>cZh}\  
#define new DEBUG_NEW ~p1j`r;  
#undef THIS_FILE ]%|GmtqZs,  
static char THIS_FILE[] = __FILE__; #bMuvaP~  
#endif |UK}  
#define IDM_SHELL WM_USER+1 Pf|siC^;s~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QrfG^GID  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'qjeXqGH$  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; p89wNSMl[  
class CAboutDlg : public CDialog "]z-: \ V  
{ <%maDM^_\(  
 public: 1abtgDL  
  CAboutDlg(); h(M#f7'~&  
  // Dialog Data cc#gEm)3C  
  //{{AFX_DATA(CAboutDlg) .#1~Rz1r  
  enum { IDD = IDD_ABOUTBOX }; 9A} # 6  
  //}}AFX_DATA jqv-D  
  // ClassWizard generated virtual function overrides Tsgk/e9K2?  
  //{{AFX_VIRTUAL(CAboutDlg) b /@#}Gc  
 protected: 2ggdWg7z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0o+6Q8q  
  //}}AFX_VIRTUAL y9_K, g  
  // Implementation A3|Dz&@:  
 protected: K@#(*."  
  //{{AFX_MSG(CAboutDlg) )Z(TCJ~~!  
  //}}AFX_MSG (@t(?Js  
  DECLARE_MESSAGE_MAP() o>/YAX:.!T  
}; V>ieh2G(  
'f[T&o&L/  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &$]v h  
{ zRq-b`<7V  
 //{{AFX_DATA_INIT(CAboutDlg) {P{bOe  
 //}}AFX_DATA_INIT sA'6ty  
} --HF8_8;'  
c.,2GwW  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) p$h4u_  
{ _h X]%  
 CDialog::DoDataExchange(pDX); ;cPy1  
 //{{AFX_DATA_MAP(CAboutDlg) <(-3_s6-  
 //}}AFX_DATA_MAP !OA]s%u  
} }&n<uUDH  
%7"X(Ts7B  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) wm)#[x #  
 //{{AFX_MSG_MAP(CAboutDlg) 3~}uqaGt  
 // No message handlers T{Sb^-H#X  
 //}}AFX_MSG_MAP zY|t0H  
END_MESSAGE_MAP() `0P$#5?  
GG@ md_  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) s}jHl8  
: CDialog(CCaptureDlg::IDD, pParent) F'B8v 3  
{ EGZb7:Y?  
 //{{AFX_DATA_INIT(CCaptureDlg) G`\f  
  m_bControl = FALSE; m9"n4a|:  
  m_bAlt = FALSE; T9]HGB{  
  m_bShift = FALSE;  /o[?D  
  m_Path = _T("c:\\"); wQwQXNG  
  m_Number = _T("0 picture captured."); 6`v7c!7  
  nCount=0; \RvvHty-V  
  bRegistered=FALSE; jFA{+Yr1  
  bTray=FALSE; 7N:Y?Hi\  
 //}}AFX_DATA_INIT po$ /7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ~.UrL(l=  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); -[6z 1"*  
} *d"DA[(  
epU:  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX)  ))&;}2{  
{ m|=H#  
 CDialog::DoDataExchange(pDX); q{t*34R  
 //{{AFX_DATA_MAP(CCaptureDlg) _io+YzS  
  DDX_Control(pDX, IDC_KEY, m_Key); d!:6[7X6  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); xZ4~Oo@@_'  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Z00+!Tnd  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); P?t" jKp'  
  DDX_Text(pDX, IDC_PATH, m_Path); qIY~dQ|  
  DDX_Text(pDX, IDC_NUMBER, m_Number); =!`j7#:  
 //}}AFX_DATA_MAP h\nI!{A0  
} NGOqy+Ty{f  
/c2w/+ _  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) d4nH_?  
//{{AFX_MSG_MAP(CCaptureDlg) L ]w/P|  
 ON_WM_SYSCOMMAND() GDD '[;  
 ON_WM_PAINT() .h9l7 nZt  
 ON_WM_QUERYDRAGICON() ")V130<  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) b|+wc6   
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2Z3('?\z~  
 ON_BN_CLICKED(ID_CHANGE, OnChange) U2`'qsR1  
//}}AFX_MSG_MAP S(uf(q|{  
END_MESSAGE_MAP() 'UMXq~RMe  
wg0 \_@3  
BOOL CCaptureDlg::OnInitDialog() rMUT_^  
{ xf b]b2  
 CDialog::OnInitDialog(); 4dhvFGlW  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); `67[O4$<  
 ASSERT(IDM_ABOUTBOX < 0xF000); 6IWxPt ~  
 CMenu* pSysMenu = GetSystemMenu(FALSE); {%IExPJ  
 if (pSysMenu != NULL) ,:??P1  
 {  w~ [b*$  
  CString strAboutMenu; ]79:yMD~ba  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Sp}tD<V  
  if (!strAboutMenu.IsEmpty()) u$-U*r  
  { zOGU8Wg  
   pSysMenu->AppendMenu(MF_SEPARATOR); ^_ kJKM,  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); cOPB2\,  
  } "dI;  
 } Sr%;fq  
 SetIcon(m_hIcon, TRUE); // Set big icon }S3qBQTYL  
 SetIcon(m_hIcon, FALSE); // Set small icon Er{#ziN+  
 m_Key.SetCurSel(0); \[jq4`\$  
 RegisterHotkey(); D5:{fWVsV/  
 CMenu* pMenu=GetSystemMenu(FALSE); 7}vg.hmZ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); @DZB9DDR  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); CT1ja.\;  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); kI:}| _  
 return TRUE; // return TRUE unless you set the focus to a control qQ0cJIISb\  
} \mV'mZ9>  
7f~Sf  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) _L@2_#h!  
{ ,2j.<g&   
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) rtL}W__  
 { .N*Pl(<[  
  CAboutDlg dlgAbout; VMCLHpSfW  
  dlgAbout.DoModal(); ({NAMc*  
 } k iRa+w:  
 else +e-G,%>9  
 { JqMDqPIQ  
  CDialog::OnSysCommand(nID, lParam); %zSuK8kxV  
 } fwBRWr9  
} _z54Ycr4H  
`\m*+Bk[5  
void CCaptureDlg::OnPaint() :OW ;?{ ~j  
{ Bf$_XG3  
 if (IsIconic()) #?XQ7Im  
 { l2&`J_"  
  CPaintDC dc(this); // device context for painting /__PSK  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); HgBGV0  
  // Center icon in client rectangle MdXchO-Lyc  
  int cxIcon = GetSystemMetrics(SM_CXICON); =L C:SFzF  
  int cyIcon = GetSystemMetrics(SM_CYICON); %/>Y/!;  
  CRect rect; U-:ieao@  
  GetClientRect(&rect); )x]3Zq  
  int x = (rect.Width() - cxIcon + 1) / 2; QjC22lW-  
  int y = (rect.Height() - cyIcon + 1) / 2; tOOchu?=  
  // Draw the icon iC*F  
  dc.DrawIcon(x, y, m_hIcon); [xT:]Pw}  
 } EZYBeqv  
 else 9 Rx s  
 { 0d3+0EN{  
  CDialog::OnPaint(); gd0Vp Xf'  
 } |,aG%MTL  
} kFQ8 y~>y}  
z Nl ,  
HCURSOR CCaptureDlg::OnQueryDragIcon() J!5v~<v?-  
{ P<Zh XN'  
 return (HCURSOR) m_hIcon; lw :`M2P,  
} %eJGt e-  
CT\;xt,S  
void CCaptureDlg::OnCancel() ]IL;`>Gp  
{ 7^M9qTEHp  
 if(bTray) /l{ &iLz[  
  DeleteIcon(); m~>Y{F2  
  CDialog::OnCancel(); 3 E3qd'  
} &E M\CjKv"  
<&!v1yR  
void CCaptureDlg::OnAbout() $ -c!W!H  
{ n=,\;3Y=  
 CAboutDlg dlg; !sRngXCXk?  
 dlg.DoModal(); sO5?aB&  
} i@][rdhT  
-kS~xVS|  
void CCaptureDlg::OnBrowse() 9m-)Xdoy  
{ 8v7 1e>  
 CString str; 93<:RV  
 BROWSEINFO bi; dV Q-k  
 char name[MAX_PATH]; RID]pek  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); fl;s9:<  
 bi.hwndOwner=GetSafeHwnd(); kEO7PK/  
 bi.pszDisplayName=name; zSE<"(a  
 bi.lpszTitle="Select folder"; fS:1^A2,  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @m?QR(LJ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); !I\!;b  
 if(idl==NULL) &h~Xq^  
  return; 4HAp{a1  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ||zb6|7I4  
 str.ReleaseBuffer(); : iiw3#]  
 m_Path=str; >I<r)w]  
 if(str.GetAt(str.GetLength()-1)!='\\') jt@SZI`  
  m_Path+="\\"; < F )_!0C  
 UpdateData(FALSE); 0A:n0[V:]  
} fGv#s X  
zFQ&5@43  
void CCaptureDlg::SaveBmp() 9 C{;h  
{ 4G@nZn  
 CDC dc; \j2;4O?`  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); hb/]8mR  
 CBitmap bm; NjE</Empb%  
 int Width=GetSystemMetrics(SM_CXSCREEN); v?c 0[+?  
 int Height=GetSystemMetrics(SM_CYSCREEN); b7/AnSR~Jt  
 bm.CreateCompatibleBitmap(&dc,Width,Height); A!vCb 8(TX  
 CDC tdc; +p8BGNW,  
 tdc.CreateCompatibleDC(&dc); 'u4ezwF;  
 CBitmap*pOld=tdc.SelectObject(&bm); 4 V1bLm  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ,+;:3gRk9  
 tdc.SelectObject(pOld); @R m-CWa  
 BITMAP btm; D{v8q)5r  
 bm.GetBitmap(&btm); `p'Q7m2y/b  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; NWfAxkz {/  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ?k[p<Uo  
 BITMAPINFOHEADER bih; 3M0+"l(X  
 bih.biBitCount=btm.bmBitsPixel; ez3Z3t`  
 bih.biClrImportant=0; eh*6cQ.0  
 bih.biClrUsed=0; Eh| .  
 bih.biCompression=0; K\^ 0_F K  
 bih.biHeight=btm.bmHeight; 0GDvwy D1  
 bih.biPlanes=1; dJ:MjQG`W  
 bih.biSize=sizeof(BITMAPINFOHEADER); ?4CNkk=v  
 bih.biSizeImage=size; Cv)/7vyB8  
 bih.biWidth=btm.bmWidth; (]*H[)F/  
 bih.biXPelsPerMeter=0; =N);v\ Q$!  
 bih.biYPelsPerMeter=0; jxgj,h"}9`  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?4G|+yby  
 static int filecount=0; Zs2-u^3&  
 CString name; I =Wc&1g  
 name.Format("pict%04d.bmp",filecount++); OOBhbpg!D  
 name=m_Path+name; l$*=<tV  
 BITMAPFILEHEADER bfh; m6 s7F/  
 bfh.bfReserved1=bfh.bfReserved2=0; ]v G{kAnH  
 bfh.bfType=((WORD)('M'<< 8)|'B'); : t$l.+B  
 bfh.bfSize=54+size; U"f ??y%)  
 bfh.bfOffBits=54; fQnwy!-\  
 CFile bf; sP'0Sl~NU  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1\L[i];L8  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); (x;g/!:  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); mgZf3?,)  
  bf.WriteHuge(lpData,size); 1x~U*vbhQ  
  bf.Close(); k;dXOn  
  nCount++; z5Qs @dG  
 } XA_FOw!cX  
 GlobalFreePtr(lpData); +~nzii3  
 if(nCount==1) _U| 7'^|  
  m_Number.Format("%d picture captured.",nCount); Xj+q~4{|vt  
 else wyxGe<1  
  m_Number.Format("%d pictures captured.",nCount); :`vP}I ^  
  UpdateData(FALSE);  6qo^2  
} >cL{Ya}Rz  
DZ ^1s~  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) s]27l3)B  
{ HjWq[[Nz  
 if(pMsg -> message == WM_KEYDOWN) =wi*Nd7L  
 { '[P}&<ie,  
  if(pMsg -> wParam == VK_ESCAPE) )<4_:  
   return TRUE; 4\ /*jA  
  if(pMsg -> wParam == VK_RETURN) G&eP5'B4i  
   return TRUE; qu6DQ@ ~YC  
 } SKY*.IW/Z  
 return CDialog::PreTranslateMessage(pMsg); 9=dkx^q  
} 9O,,m~B  
Lb=W;9;  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) VY 1vXM3y  
{ qBk``!|s]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ oCi ~P}r  
  SaveBmp(); CPazEe1S  
  return FALSE; ,je`YEC  
} P}3}ek1Ax  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ GgFi9Ffj  
 CMenu pop; T&"i _no*  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;eB ~H[S/  
 CMenu*pMenu=pop.GetSubMenu(0); &[|VZ[  
 pMenu->SetDefaultItem(ID_EXITICON); mjnUs-`W|  
 CPoint pt; HO|-@yOF^  
 GetCursorPos(&pt); xcCl (M]+  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); I12KT~z<r  
 if(id==ID_EXITICON) {#Q\z>  
  DeleteIcon(); farDaS[\VY  
 else if(id==ID_EXIT) N1--~e  
  OnCancel(); u~ F ;x Q  
 return FALSE; e5v`;(^M  
} q<=: >?  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Xwu.AVsr  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) D>T],3U(H  
 AddIcon(); ,35&G"JK5  
 return res; @y~P&HUN  
} Yig0/ "  
MXAEX2xmme  
void CCaptureDlg::AddIcon() Sg*0[a3z  
{ 0??Yr  
 NOTIFYICONDATA data; [!*xO?yCJ  
 data.cbSize=sizeof(NOTIFYICONDATA); EH9Hpo  
 CString tip; ,qFA\cO*  
 tip.LoadString(IDS_ICONTIP); q@#BPu"\l  
 data.hIcon=GetIcon(0); E%k7wM {  
 data.hWnd=GetSafeHwnd(); udqge?Tz  
 strcpy(data.szTip,tip); aSnp/g  
 data.uCallbackMessage=IDM_SHELL; +QqH}= M  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Zy]s`aa  
 data.uID=98; z)L}ECZh9  
 Shell_NotifyIcon(NIM_ADD,&data); -]"T^w ib  
 ShowWindow(SW_HIDE); 2 g`[u|  
 bTray=TRUE; ~5#)N{GbY  
} ?s{C//  
X}JWf<=q  
void CCaptureDlg::DeleteIcon() 9k2,3It  
{ KXBL eR&^  
 NOTIFYICONDATA data; R ZcH+?7  
 data.cbSize=sizeof(NOTIFYICONDATA); bcJ@-i0V  
 data.hWnd=GetSafeHwnd(); 8cr NOZS6  
 data.uID=98; xl!K;Y2<  
 Shell_NotifyIcon(NIM_DELETE,&data); A]y*so!)>  
 ShowWindow(SW_SHOW); .;Y x*]  
 SetForegroundWindow(); ]O{_O&w  
 ShowWindow(SW_SHOWNORMAL); NtZ6$o<Y  
 bTray=FALSE; Z$2L~j"=!  
} ]if;A)'  
{/UhUG  
void CCaptureDlg::OnChange() I"Q<n[g0'  
{ ua& @GXvZ  
 RegisterHotkey(); U}P,EP%p  
} ~w.2 -D  
pzEABA   
BOOL CCaptureDlg::RegisterHotkey() ,nE&Me&#J  
{ ckwF|:e 7*  
 UpdateData(); gL]'B!dGd  
 UCHAR mask=0; U )Zt-og  
 UCHAR key=0; ]tVl{" .{  
 if(m_bControl) 5Hle-FDn9  
  mask|=4; 5RhF+p4  
 if(m_bAlt) $pu3Ig$^  
  mask|=2; 1mUTtYU  
 if(m_bShift) i,OKf Xp  
  mask|=1; U)~#g'6:8  
  key=Key_Table[m_Key.GetCurSel()]; 6VR18Y!y  
 if(bRegistered){ rF8 hr  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); %h*5xB]Tt  
  bRegistered=FALSE; 5~xeO@%I  
 } %Dyh:h   
 cMask=mask; Mvof%I  
 cKey=key; NWISS  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); [ -12]3  
 return bRegistered; [h", D5  
} eY3=|RR  
|!b9b(_j9  
  四、小结 {})y^L  
ZlM_ m >,o  
  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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