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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: t-)C0<  
  4N|^Joi  
  一、实现方法 $z)r(N$  
qCi6kEr  
  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: %(79;#2`  
prV:Kq;O  
#pragma data_seg("shareddata") za `  
HHOOK hHook =NULL; //钩子句柄 Es/\/vF7]D  
UINT nHookCount =0; //挂接的程序数目 DJ2EV^D+P  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 VPx"l5\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 M}kt q)  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey u_[s+ J/  
static int KeyCount =0; > SU2Jw  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 W9D]s~bO;  
#pragma data_seg() C0eP/d  
_@3@_GE  
  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。 K3Zc>QL{  
4W &HUQ?^  
  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: eQbDs_  
q90eB6G0g  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR L1 1/XpR  
cKey,UCHAR cMask) (iXo\y`z  
{ vr+O)/P})  
 BOOL bAdded=FALSE; eZ#nZB  
 for(int index=0;index<MAX_KEY;index++){ BWamF{\d1a  
  if(hCallWnd[index]==0){ O]o `! c  
   hCallWnd[index]=hWnd; hqd}L~o:  
   HotKey[index]=cKey; `j{q$Y=AG  
   HotKeyMask[index]=cMask; 2"*7H S  
   bAdded=TRUE; K+5S7wFDZ  
   KeyCount++; 6r4o47_t8#  
   break; S-&[Tp+N  
  } U?P5 cN  
 } W 0%FZ0 l  
 return bAdded; G%_6" s  
} CZcn X8P'8  
//删除热键 }J"}5O2,b  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -'*\KA@u  
{ 2 UU5\ jV6  
 BOOL bRemoved=FALSE; |!NKKvf  
 for(int index=0;index<MAX_KEY;index++){ L s6P<"V  
  if(hCallWnd[index]==hWnd){ k7yQEU  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ sS/#)/B  
    hCallWnd[index]=NULL; Rd7Xs  
    HotKey[index]=0; `OO=^.-u  
    HotKeyMask[index]=0; Bt[OGa(q  
    bRemoved=TRUE; &(UVS0=Dp,  
    KeyCount--; P~$FgAV  
    break; {h5 S=b  
   } u4*7 n-(  
  } l3dGe'  
 } bU9B2'%E  
 return bRemoved; ;gfY_MXnF  
} /^v?Q9=Y  
#-?pY"N,  
o_>id^$>B  
  DLL中的钩子函数如下: zY6{ OP!#  
R{uq8NA- W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) O*^=  
{ WlVp|s{TYP  
 BOOL bProcessed=FALSE; (ds-p[`[m  
 if(HC_ACTION==nCode) a=}JW]  
 { S(<r-bV<  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 %upnXRzw  
   switch(wParam) EkS7j>:  
   {  hyqsMkW|  
    case VK_MENU: !m)P*Lw  
     MaskBits&=~ALTBIT; 22lC^)`TE  
     break; SZW+<X  
    case VK_CONTROL: M il ![A1  
     MaskBits&=~CTRLBIT; 4X,fb`  
     break; 2gLa4B-  
    case VK_SHIFT: &(a#I]`9M  
     MaskBits&=~SHIFTBIT; a'=C/ s+  
     break; ^{\gD23  
    default: //judge the key and send message 72@lDY4cE  
     break; c#X9d8>  
   } SJ$N]<d  
   for(int index=0;index<MAX_KEY;index++){ _X5@%/Vz  
    if(hCallWnd[index]==NULL) /Ud<4j-  
     continue; LnZzY0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qd\5S*Z1  
    { HPJ\]HV(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )vVt{g  
     bProcessed=TRUE; 8Yfg@"Tn  
    } l`D^)~o8  
   } ljg2P5  
  } ;O` \rP5w  
  else if((lParam&0xc000ffff)==1){ //有键按下 s *$Re)}S  
   switch(wParam) ^M36=~j  
   { 'ap<]mf2  
    case VK_MENU: YYfX@`\  
     MaskBits|=ALTBIT; S0?4}7`A  
     break; pGEYke NU  
    case VK_CONTROL: ,Y 1&[  
     MaskBits|=CTRLBIT; ` QC  
     break; pUtd_8  
    case VK_SHIFT: *PQu9>1w  
     MaskBits|=SHIFTBIT; OL+dx`Y  
     break; 0IU>KGJ-0s  
    default: //judge the key and send message *h6Lh]7  
     break; g}HB|$P7  
   } :.5l9Ci4  
   for(int index=0;index<MAX_KEY;index++){ `tZu~ n  
    if(hCallWnd[index]==NULL) bH+x `]{A  
     continue; Us4J[MW<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 34S|[PX d  
    { 7-a[W   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Ckd=tvL  
     bProcessed=TRUE; x;A"S  
    } # D8Z~U,-  
   } E#3KWp#M  
  } ]iu}5]?)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 l !VPk"s  
   for(int index=0;index<MAX_KEY;index++){ g%()8QxE1  
    if(hCallWnd[index]==NULL) v^;-w~?3  
     continue; a#H2H`%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -<rQOPH%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Nu !(7  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 !9GJ9ZEXM  
   } Da_8Q(XFe  
  } 2uonT,W  
 } :B(F ?9qK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); o+(>/Ou  
} ~x<nz/^  
&' ,A2iG  
  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: m8KJ~02l#  
A)9[.fhx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *Z0Y:"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6{h+(|.(  
CNwYQe-i  
  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: 'u@_4wWp  
.yz-o\,gF%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Jh1Q)05  
{ scmn-4j'{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) }$DLa#\-  
 { hjCFN1 #Sa  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 l#7].-/  
  SaveBmp(); G dZ_  
  return FALSE; ua$H"(#c  
 } |,zcrOo]  
 …… //其它处理及默认处理 hw[jVx  
} +$]eA'Bh@  
Nda,G++5(  
$@m)8T  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ;8WgbR)ZLU  
,(aOTFQS  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 7U=|>)Q0s  
~ou1{NS  
  二、编程步骤 ^qNh)?V?]I  
w k1O*_76  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Qd~M;L O"i  
x!\FB.h4!(  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; |~'D8 g:Ak  
} sTo,F$  
  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; uP,{yna(  
s|3@\9\  
  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; ) V}q7\G~  
k+k&}8e  
  5、 添加代码,编译运行程序。 .54E*V1  
f.f5f%lO~  
三、程序代码 *We.?"X'].  
?O1:-vpZ  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL qGndh  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) g8+w?Zn}  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ]TTX<R ZLr  
#if _MSC_VER > 1000 0,)Ao8  
#pragma once _ED,DM  
#endif // _MSC_VER > 1000 J &,N1B  
#ifndef __AFXWIN_H__ }@IRReQ  
#error include 'stdafx.h' before including this file for PCH e|wH5(V  
#endif z4l O  
#include "resource.h" // main symbols Dd+ f,$  
class CHookApp : public CWinApp %(4G[R[  
{ nnBgTtsC]  
 public: V\axOz!  
  CHookApp(); hK=\O)  
  // Overrides  ESOuDD2<  
  // ClassWizard generated virtual function overrides q|PB[*T  
  //{{AFX_VIRTUAL(CHookApp) ]:* 8 Mb#  
 public: StUiL>9T#  
  virtual BOOL InitInstance(); k;V4%O  
  virtual int ExitInstance(); @\gTi;u/x  
  //}}AFX_VIRTUAL Q;O\tl  
  //{{AFX_MSG(CHookApp) f'/@h Na3  
  // NOTE - the ClassWizard will add and remove member functions here. JyPsRpi\  
  // DO NOT EDIT what you see in these blocks of generated code ! 2N]u!S;d  
  //}}AFX_MSG UN`F|~@v  
  DECLARE_MESSAGE_MAP() COS(pfC  
}; ejj|l   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); >:l; W4j  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); oo\0X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j7;v'eA`;7  
BOOL InitHotkey(); Ks&~VU  
BOOL UnInit(); 'BT}'qN  
#endif T-7'#uB.m  
G?-27Jk8  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. y<YVb@O.  
#include "stdafx.h" 8kZ ~  
#include "hook.h" fn|l9k~<O  
#include <windowsx.h> j=v1:E  
#ifdef _DEBUG .8is! TT  
#define new DEBUG_NEW O[RmQ8ll  
#undef THIS_FILE 1jZ:@M :  
static char THIS_FILE[] = __FILE__; rI&GM |  
#endif Zl]Zy}p*+  
#define MAX_KEY 100 w>I>9O}(`  
#define CTRLBIT 0x04 ]pLQ;7f7D  
#define ALTBIT 0x02 cmDskQ:  
#define SHIFTBIT 0x01 9%\<x  
#pragma data_seg("shareddata") ]d"4G7mu`l  
HHOOK hHook =NULL; RL>Nl ow  
UINT nHookCount =0; 5GK=R aV  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 2,Y8ML<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT N" |^AF  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey `Rj<qz^7  
static int KeyCount =0; 1E Lzzn  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift RMB?H)p+  
#pragma data_seg() 9GS<d.#Nvc  
HINSTANCE hins; Cna@3)_  
void VerifyWindow(); gF% lwq  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) L1u  
//{{AFX_MSG_MAP(CHookApp) Auhw(b>}TW  
// NOTE - the ClassWizard will add and remove mapping macros here. lo:]r.lX{  
// DO NOT EDIT what you see in these blocks of generated code! Du>dTi~  
//}}AFX_MSG_MAP yWIM,2x}  
END_MESSAGE_MAP() 8WWRKP1V  
g# ZR, q  
CHookApp::CHookApp() 'l\V{0;mp  
{ gf+Kr02~  
 // TODO: add construction code here, 5EIhCbA  
 // Place all significant initialization in InitInstance ErF;5ec  
} `>RJ*_aKEI  
<\x/Y$jm0n  
CHookApp theApp; 76[aOC2Ad  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) U{D ?1tF  
{ dQ^>,(  
 BOOL bProcessed=FALSE; Uq)|]a&e  
 if(HC_ACTION==nCode) CAY^ `K!  
 { c1wM"  
  if((lParam&0xc0000000)==0xc0000000){// Key up Kzxzz6R?  
   switch(wParam) / /qTMxn  
   { k%QhF]  
    case VK_MENU: t~p9iGX<  
     MaskBits&=~ALTBIT; AO;`k]0e  
     break; ZZTPAmIr  
    case VK_CONTROL: IoNZ'g?d  
     MaskBits&=~CTRLBIT; T3['6%  
     break; GFvZdP`s4  
    case VK_SHIFT: , j ,[4^  
     MaskBits&=~SHIFTBIT; '6{q;Bxo  
     break; 1rC8] M.N  
    default: //judge the key and send message Ig1cf9 :  
     break; 9A\J*OU  
   } VS^%PM#:/  
   for(int index=0;index<MAX_KEY;index++){ }jTEgog  
    if(hCallWnd[index]==NULL) Js qze'BGY  
     continue; YP~d1BWvf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -$;H_B+.  
    { C 0*k@kGy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); O:q}<ljp  
     bProcessed=TRUE; GZQ)Tz R  
    } 3P/T`)V  
   } r4NI(\gU  
  } u7@|fND 7  
  else if((lParam&0xc000ffff)==1){ //Key down %'`Dd  
   switch(wParam) ksY^w+>(!  
   { -w 2!k  
    case VK_MENU: ezlp~z"_k  
     MaskBits|=ALTBIT; 5@j?7%_8  
     break; @okC":Fw,  
    case VK_CONTROL: a#!Vi93  
     MaskBits|=CTRLBIT; 'O]_A57  
     break; /{7x|ay]  
    case VK_SHIFT: m&,d8Gss^  
     MaskBits|=SHIFTBIT; 8,Yc1  
     break; EBw}/y{Kt  
    default: //judge the key and send message )aqu f<u@  
     break; U_!"&O5lr  
   } ?TE#4}p|  
   for(int index=0;index<MAX_KEY;index++) ({![  
   { X =S;8=N  
    if(hCallWnd[index]==NULL) ci5ERv`  
     continue; 2DTH|Yv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )rhKWg  
    { dz5bW>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); A3&8@/6,  
     bProcessed=TRUE; -+|0LXo  
    } M6 AQ8~z  
   } s\o </ZDo  
  } OdRXNk:k-j  
  if(!bProcessed){ yhQo1e>  
   for(int index=0;index<MAX_KEY;index++){ _w+sx5  
    if(hCallWnd[index]==NULL) rf;R"Uc  
     continue; Sijwh1j*V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4,FkA_k  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;^}cZ  
   } lZ^XZjwoM  
  } CJjma=XH  
 } / c/!13|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3`#sXt9C  
} nUmA  
ErB6fl  
BOOL InitHotkey() @[zPN[z .  
{ Ca+d ?IS  
 if(hHook!=NULL){ ,Q(n(m'  
  nHookCount++; 1$@k@*u\  
  return TRUE; GOH@|2N  
 } &#.XLe\y  
 else L)Un9&4L  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); y+Q!4A  
  if(hHook!=NULL) $g#X9/+<  
   nHookCount++; .eZ4?|at.F  
  return (hHook!=NULL); ,2H5CFX/  
} OD>-^W t;%  
BOOL UnInit() ; {I{X}b  
{ `Up<;  
 if(nHookCount>1){ JEY%(UR8  
  nHookCount--; 2c0eh-Gf  
  return TRUE; _}jj>+zA`  
 } W@"M/<r@/  
 BOOL unhooked = UnhookWindowsHookEx(hHook); yuFuYo&[?v  
 if(unhooked==TRUE){ 1P8$z:|~  
  nHookCount=0; mg'-]>$$]  
  hHook=NULL; M P0ww$(  
 } K+T`'J4  
 return unhooked; ixiRFBUcF~  
} 2)[81a  
|[!xLqG  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 'r1&zw(  
{ v.r$]O  
 BOOL bAdded=FALSE; b)@D*plS&  
 for(int index=0;index<MAX_KEY;index++){ #: ' P3)&  
  if(hCallWnd[index]==0){ %PlPXoG=  
   hCallWnd[index]=hWnd; -Rjn<bTIy  
   HotKey[index]=cKey; w^R5/#F_r  
   HotKeyMask[index]=cMask; sS5#Q  
   bAdded=TRUE; nkN]z ^j  
   KeyCount++; =5dv38  
   break; K<Yh'RvTD  
  } *XtZ;os]  
 } woR((K] #G  
 return bAdded; .s7/bF  
} ,vg8iR a  
s%4)}w;z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .fo.mC@a  
{ YqNhD6  
 BOOL bRemoved=FALSE; CoJaVLl  
 for(int index=0;index<MAX_KEY;index++){ \,p)  
  if(hCallWnd[index]==hWnd){ +qsdA#2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ G-"#3{~2  
    hCallWnd[index]=NULL; *#UDMoz<  
    HotKey[index]=0; 0C3Yina9 *  
    HotKeyMask[index]=0; kf"cd 1  
    bRemoved=TRUE; Vx* =  
    KeyCount--; cO(|>&tJ  
    break; J=4S\0Z*  
   } *WX6C("M  
  } +#&2*nY  
 } )}WG`  
 return bRemoved; K3 ]hUe#  
} ,8$;|#d  
m} Yf6:cr  
void VerifyWindow() u{6*}6@fi  
{ 3kYUO-qw  
 for(int i=0;i<MAX_KEY;i++){ hC6$>tl  
  if(hCallWnd!=NULL){ )%,bog(x  
   if(!IsWindow(hCallWnd)){ x( mY$l,il  
    hCallWnd=NULL; jgEiemh&  
    HotKey=0; [FyE{NfiJ%  
    HotKeyMask=0; w`#lLl B  
    KeyCount--; >-)i_C2  
   } z)|56 F7'  
  } |:H[Y"$1;  
 } T w"^I*B  
} D eXnE$XH  
?`FI!3j  
BOOL CHookApp::InitInstance() NRoi` IIj  
{ d54>nycU~N  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); .P,\69g~A  
 hins=AfxGetInstanceHandle(); W4>8  
 InitHotkey(); GVEjB;  
 return CWinApp::InitInstance(); I[[rVts  
} "me J n/  
GueqpEd2  
int CHookApp::ExitInstance() ,qvz:a  
{ IK %j+UB  
 VerifyWindow(); H%faRUonz  
 UnInit(); uv_*E`pN~  
 return CWinApp::ExitInstance(); ~f%gW  
} 4|++0=#D$  
/5yW vra  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file N{Is2Ia  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 5,?9#n\E,  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ kv (N/G  
#if _MSC_VER > 1000 /1MO]u\  
#pragma once -u{k  
#endif // _MSC_VER > 1000 Q'Q+mt8u5  
[IV8  
class CCaptureDlg : public CDialog Ns1u0$fg  
{ \f{C2d/6j  
 // Construction W*U\79H  
 public: `86 9XE  
  BOOL bTray; `?Y/:4  
  BOOL bRegistered; O 6A:0yM4  
  BOOL RegisterHotkey(); 2!" N9Adt  
  UCHAR cKey; >mt<`s  
  UCHAR cMask; eU{=x$o6S  
  void DeleteIcon(); KtV_DjH:  
  void AddIcon(); 3s>& h-E  
  UINT nCount; r."Dc  
  void SaveBmp(); ~@sx}u  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor +Do7rl  
  // Dialog Data 26\1tOj Np  
  //{{AFX_DATA(CCaptureDlg) z ^a,7}4  
  enum { IDD = IDD_CAPTURE_DIALOG }; Y%wF;I1x  
  CComboBox m_Key; >nl *aN  
  BOOL m_bControl; !vett4C* K  
  BOOL m_bAlt; tb@/E  
  BOOL m_bShift; \>I&UFfH)4  
  CString m_Path; )cOm\^,  
  CString m_Number;  "&C'K  
  //}}AFX_DATA 4H1s"mP<  
  // ClassWizard generated virtual function overrides b(~NqV!i  
  //{{AFX_VIRTUAL(CCaptureDlg) 6Ajiz_~U  
 public: OkFq>;{a  
  virtual BOOL PreTranslateMessage(MSG* pMsg); %C)U F  
 protected: wF38c]r`\<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support AK [9fxrE  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ADHe! [6q  
  //}}AFX_VIRTUAL uMqo)J@s  
  // Implementation jRq>Sz{8  
 protected: BHFWig*{  
  HICON m_hIcon; 7i/?+|  
  // Generated message map functions (mza&WF7  
  //{{AFX_MSG(CCaptureDlg) //6m2a  
  virtual BOOL OnInitDialog(); y4envjl 0  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~'T]B{.+J  
  afx_msg void OnPaint(); C(?lp  
  afx_msg HCURSOR OnQueryDragIcon(); b/S4b  
  virtual void OnCancel(); ^M?uv{354  
  afx_msg void OnAbout(); KN+*_L-  
  afx_msg void OnBrowse(); TXy*-<#vR  
  afx_msg void OnChange(); 5(DCq(\P*  
 //}}AFX_MSG XPX{c|]>.  
 DECLARE_MESSAGE_MAP() q:nYUW o   
}; ]vu' +F$  
#endif Lw!@[;2  
_G'.VSGH  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file gk] r:p<O  
#include "stdafx.h" GH:Au  
#include "Capture.h" dd$\Q  
#include "CaptureDlg.h" [ ra [~  
#include <windowsx.h> x{ZcF=4  
#pragma comment(lib,"hook.lib") |t.WPp5,  
#ifdef _DEBUG (>)Y0ki}  
#define new DEBUG_NEW fh,Y#.V`  
#undef THIS_FILE |/r@z[t  
static char THIS_FILE[] = __FILE__; ];Z_S`JR  
#endif y)(@  
#define IDM_SHELL WM_USER+1 I s88+,O  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I98wMV8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c?z% z&  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; v_G4:tY  
class CAboutDlg : public CDialog gw5CU)r4$  
{ S9xC> |<  
 public: qLPI^g,  
  CAboutDlg();  ExnszFX*  
  // Dialog Data 1lx\Pz@ol  
  //{{AFX_DATA(CAboutDlg) _ k>j?j-  
  enum { IDD = IDD_ABOUTBOX }; /?by4v73P  
  //}}AFX_DATA 1bvL  
  // ClassWizard generated virtual function overrides 9`vse>,-hg  
  //{{AFX_VIRTUAL(CAboutDlg) 2@A7i<p  
 protected: ;N4mR6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support wV(_=LF  
  //}}AFX_VIRTUAL dn5T7a~   
  // Implementation 9Uk9TG5  
 protected: V#sANi?mpo  
  //{{AFX_MSG(CAboutDlg) +/UInAM  
  //}}AFX_MSG 7GPBn}{W  
  DECLARE_MESSAGE_MAP() oTfEX4 t {  
}; %7L'2/Y2x  
  (+Er  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Rhr]ML  
{ \w`Il"}V  
 //{{AFX_DATA_INIT(CAboutDlg) +LX&1GX  
 //}}AFX_DATA_INIT ok[R`99  
} .0s/O  
9^jO^[>  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) [c3hwogf:  
{ oR3$A :!P=  
 CDialog::DoDataExchange(pDX); `#9ZP  
 //{{AFX_DATA_MAP(CAboutDlg) UkeW2l`:  
 //}}AFX_DATA_MAP )_f "[m%  
} wdp 4-*  
c.d*DM}W  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) \WZ00Y,*  
 //{{AFX_MSG_MAP(CAboutDlg) p%,JWZ[  
 // No message handlers x#pT B.  
 //}}AFX_MSG_MAP m4kmJaM  
END_MESSAGE_MAP() _u.l|yR  
cL`l1:j\}  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) \)LY_D:  
: CDialog(CCaptureDlg::IDD, pParent) iaPY>EP1  
{ 6idYz"P %  
 //{{AFX_DATA_INIT(CCaptureDlg) NEK;'"  ~  
  m_bControl = FALSE; /~AajLxu3W  
  m_bAlt = FALSE; OZ7MpQ  
  m_bShift = FALSE; U[Z1@2zLx  
  m_Path = _T("c:\\"); McA,  
  m_Number = _T("0 picture captured."); WI~';dK2]  
  nCount=0; w`i3B@w  
  bRegistered=FALSE; !5p 01]7  
  bTray=FALSE; 7(wY4T  
 //}}AFX_DATA_INIT HW{+THNj  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32  BeP0lZ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); !f"@pR6  
} o<%Sr*  
R#Ss_y  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) F5E KWP  
{ b/2t@VlL  
 CDialog::DoDataExchange(pDX); _D z4 }:9  
 //{{AFX_DATA_MAP(CCaptureDlg) q?\3m3GM  
  DDX_Control(pDX, IDC_KEY, m_Key); y'Wz*}8pr  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); !&! sn"yD  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 6h;$^3x$  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); UG1^G07s  
  DDX_Text(pDX, IDC_PATH, m_Path); u*PN1E  
  DDX_Text(pDX, IDC_NUMBER, m_Number); =1LrU$\  
 //}}AFX_DATA_MAP F#W'>WBU  
} ~EdmVEu  
 +/AW6  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 80 p7+W2m  
//{{AFX_MSG_MAP(CCaptureDlg) h!MZ 6}zb)  
 ON_WM_SYSCOMMAND() a}%>i~v<  
 ON_WM_PAINT() x/5%a{~j2  
 ON_WM_QUERYDRAGICON() j63w(Jv/  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) <51(q_f  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) o3%Gc/6%  
 ON_BN_CLICKED(ID_CHANGE, OnChange) &{l?j>|TM  
//}}AFX_MSG_MAP (}c}=V  
END_MESSAGE_MAP() `ZNz Dr  
M-0BQs`N  
BOOL CCaptureDlg::OnInitDialog() v')T^b F@  
{ |?{Zx&yUw  
 CDialog::OnInitDialog(); @u$4{sjgf\  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); }0qgvw  
 ASSERT(IDM_ABOUTBOX < 0xF000); N{oD1%  
 CMenu* pSysMenu = GetSystemMenu(FALSE); $FCLo8/=  
 if (pSysMenu != NULL) Jf4D">h  
 { lZ E x0  
  CString strAboutMenu; >'E'Mp.  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Fe`$mtPu.  
  if (!strAboutMenu.IsEmpty()) Ns&SZO  
  { rN_\tulOF  
   pSysMenu->AppendMenu(MF_SEPARATOR); =j }]-!  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); C\ 9eR  
  } uiO8F*,!&r  
 } q[**i[+%  
 SetIcon(m_hIcon, TRUE); // Set big icon XCQ =`3f  
 SetIcon(m_hIcon, FALSE); // Set small icon LLV:E{`p  
 m_Key.SetCurSel(0); <C]s\ "o-`  
 RegisterHotkey(); :8\z 0  
 CMenu* pMenu=GetSystemMenu(FALSE); 6fQQKM@a|  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); i!sKL%z}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7e>n{rl  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); r!j_KiUy  
 return TRUE; // return TRUE unless you set the focus to a control ~eE2!/%9  
} z l@ <X0q  
{n2jAR9nq  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |)yO] pB:  
{ f~8Xue,l"  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) >`\~=ivrD  
 { 62a{Ggs{  
  CAboutDlg dlgAbout; iv:[]o  
  dlgAbout.DoModal(); B-'Xk{  
 } 57rc|]C  
 else 2 ;U(r: ]  
 { 9boNB "h]T  
  CDialog::OnSysCommand(nID, lParam); |a/"7B|?\  
 } jD'\\jAUdm  
} 2Vt iL^;5  
rS8/_'  
void CCaptureDlg::OnPaint() !V#(g./W  
{ U")bvUIL  
 if (IsIconic()) Lk=f^qJ ]  
 { lc#su$xR>  
  CPaintDC dc(this); // device context for painting pz#oRuujY  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); CGny#Vh  
  // Center icon in client rectangle 'I\bz;VT  
  int cxIcon = GetSystemMetrics(SM_CXICON); '+5*ajP<  
  int cyIcon = GetSystemMetrics(SM_CYICON); d5UdRX]*  
  CRect rect; 9xN4\y6F  
  GetClientRect(&rect); Kcl>uAgU  
  int x = (rect.Width() - cxIcon + 1) / 2; l]^uVOX  
  int y = (rect.Height() - cyIcon + 1) / 2; k G4v>  
  // Draw the icon Pr<.ld\  
  dc.DrawIcon(x, y, m_hIcon); EL5gMs  
 } $x#Y\dpS  
 else `a98+x?JF  
 { 7_ZfV? .  
  CDialog::OnPaint(); iO>2#p8$NR  
 } WEOW6UV(  
} 0,E*9y}  
LoqS45-)  
HCURSOR CCaptureDlg::OnQueryDragIcon() xW!2[.O5H  
{ UuzT*Y>  
 return (HCURSOR) m_hIcon; Ae;> @k/|=  
} mfg{% .1  
o.* 8$$  
void CCaptureDlg::OnCancel() rAM{<  
{ MCjf$pZN]  
 if(bTray) _cQTQ  
  DeleteIcon(); jV#{8 8  
  CDialog::OnCancel(); >5'C<jc C  
} O#sDZ.EL  
G?#f@N0.5p  
void CCaptureDlg::OnAbout() U# G0  
{ bb}|"m .  
 CAboutDlg dlg; :l'61$=  
 dlg.DoModal(); Xg_M{t  
} f{t5r  
z~# .Ey  
void CCaptureDlg::OnBrowse() _ 2R;@[f2  
{ 4'RyD<K\  
 CString str; GNgPf"}K  
 BROWSEINFO bi; |B./5 ,nSS  
 char name[MAX_PATH]; xf_NHKZ)  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ncuqo'r  
 bi.hwndOwner=GetSafeHwnd(); s["8QCd"r  
 bi.pszDisplayName=name; 4l<%Q2  
 bi.lpszTitle="Select folder"; d *!)wt  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; j;WZ[g#t  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); /2Y t\=S=  
 if(idl==NULL) :&S6AP  
  return; Cd?a C  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >WVos 4  
 str.ReleaseBuffer(); < HlS0J9  
 m_Path=str; l c?9B  
 if(str.GetAt(str.GetLength()-1)!='\\') {U= Mfo?AH  
  m_Path+="\\"; )! Jo7SR  
 UpdateData(FALSE); yM`J+tq  
} Y(h86>z*w  
p~J|l$%0rQ  
void CCaptureDlg::SaveBmp() ]+u`E  
{ lZCTthr\  
 CDC dc; 2_'{f1bVxz  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ^_0zO$z,  
 CBitmap bm; *UJ.cQ}  
 int Width=GetSystemMetrics(SM_CXSCREEN); r#M0X^4A  
 int Height=GetSystemMetrics(SM_CYSCREEN); Y@)/iwq  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 0hVw=KDO9:  
 CDC tdc; }1kT0*'L  
 tdc.CreateCompatibleDC(&dc); VEj-%"\   
 CBitmap*pOld=tdc.SelectObject(&bm); b1>zGC^|  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *~YU0o  
 tdc.SelectObject(pOld); yU<T_&M  
 BITMAP btm; __dSEOGoe  
 bm.GetBitmap(&btm); ?Imq4I~)  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; v0+mh]  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ,l+lokD-#  
 BITMAPINFOHEADER bih; b*i_'k}*<g  
 bih.biBitCount=btm.bmBitsPixel; f*)8bZDD  
 bih.biClrImportant=0; >r J9^rS  
 bih.biClrUsed=0; mwU|Hh)N]  
 bih.biCompression=0; !6{; z/Hy  
 bih.biHeight=btm.bmHeight; Gi]R8?M  
 bih.biPlanes=1; W@Et  
 bih.biSize=sizeof(BITMAPINFOHEADER); 0eP7efy  
 bih.biSizeImage=size; E}LYO:  
 bih.biWidth=btm.bmWidth; 4HG;v|Cp  
 bih.biXPelsPerMeter=0; XRA RgWj  
 bih.biYPelsPerMeter=0; -9W)|toWb"  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9f1,E98w_  
 static int filecount=0; .K%1{`.|  
 CString name; Wwo'pke  
 name.Format("pict%04d.bmp",filecount++); >|Yr14?7  
 name=m_Path+name; xvn@zi  
 BITMAPFILEHEADER bfh; j]Y`L?!Q  
 bfh.bfReserved1=bfh.bfReserved2=0; 82d~>i%T  
 bfh.bfType=((WORD)('M'<< 8)|'B'); pbc<326X"  
 bfh.bfSize=54+size; hilgl<UF  
 bfh.bfOffBits=54; c~ x  
 CFile bf; jiw5>RNt  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ moz*=a  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); `#J0@ -  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); sa6/$  
  bf.WriteHuge(lpData,size); 4OX|pa  
  bf.Close(); 7-S?\:J  
  nCount++; b{4@ ~>i  
 } rnX D(  
 GlobalFreePtr(lpData); &/wd_;d^A  
 if(nCount==1) Dfz3\|LJ  
  m_Number.Format("%d picture captured.",nCount); /<zBjvr%%  
 else +h*-9  
  m_Number.Format("%d pictures captured.",nCount); EH1GdlhA  
  UpdateData(FALSE); iR(=< >  
} :qlcN@_  
tAPn? d5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) wN}@%D-[v  
{ lJlyfN  
 if(pMsg -> message == WM_KEYDOWN) <yt|!p-tS  
 { #7(?B{i  
  if(pMsg -> wParam == VK_ESCAPE) f)'m pp^  
   return TRUE; %BBM%Lj  
  if(pMsg -> wParam == VK_RETURN) ': fq/k3;&  
   return TRUE; Hst]}g' .  
 } *n]f)Jc  
 return CDialog::PreTranslateMessage(pMsg); #POVu|Y;h  
} naOCa  
4gKu8G  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) WK$d<:"  
{ g+v.rmX  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ '\g-z  
  SaveBmp(); >`{B  
  return FALSE; 4 q-/R  
} Yf&P|Iiw  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ kz30! L  
 CMenu pop; };/;L[,G  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); k{Ad(S4J&  
 CMenu*pMenu=pop.GetSubMenu(0); 4{zz-4=  
 pMenu->SetDefaultItem(ID_EXITICON); kfc5ra>&  
 CPoint pt; v^A4%e<8^r  
 GetCursorPos(&pt); OS - Xh-:z  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); zv.R~lMtY  
 if(id==ID_EXITICON) $tm%=g^  
  DeleteIcon(); @}{lp'8FYi  
 else if(id==ID_EXIT) ZsnFuk#W  
  OnCancel(); ^mp#7OL  
 return FALSE; kMS&"/z  
}  Q{K '#  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); O %m\ Q1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) "39\@Ow  
 AddIcon(); AT{rg/oSf  
 return res; MJ.K,e  
} nXRT%[o&  
\5 S^~(iL  
void CCaptureDlg::AddIcon() c;6[lv  
{ Nv[MU@Tv  
 NOTIFYICONDATA data; L|hoA9/]  
 data.cbSize=sizeof(NOTIFYICONDATA); bfV&z+Rv-5  
 CString tip; i$?$X,  
 tip.LoadString(IDS_ICONTIP); Vf*Z}'  
 data.hIcon=GetIcon(0); or<n[<D-C  
 data.hWnd=GetSafeHwnd(); iY[+BI:  
 strcpy(data.szTip,tip); ! )x2   
 data.uCallbackMessage=IDM_SHELL; W[VbFsI&b  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; }w_r(g?\  
 data.uID=98; MrU0Jrk4+  
 Shell_NotifyIcon(NIM_ADD,&data); :@~W$f\y  
 ShowWindow(SW_HIDE); |$:y8H'J  
 bTray=TRUE; {wL30D^  
} ' pN[H\Ia  
I5%#A/|z  
void CCaptureDlg::DeleteIcon() ]Y.GU7`  
{ C0`Bi:Ze  
 NOTIFYICONDATA data; V$?@ z>7  
 data.cbSize=sizeof(NOTIFYICONDATA); D\H;_k8  
 data.hWnd=GetSafeHwnd(); rWMG6+Scb  
 data.uID=98; Q\moR^>  
 Shell_NotifyIcon(NIM_DELETE,&data); {VmJVO]S  
 ShowWindow(SW_SHOW); gJFx#s0?6.  
 SetForegroundWindow(); zBjtPtiiI8  
 ShowWindow(SW_SHOWNORMAL); fHV%.25  
 bTray=FALSE; 3QF/{$65!  
} Ip_deP@  
]I^b&N  
void CCaptureDlg::OnChange() I%<LLkQ  
{ l^k/Y ]  
 RegisterHotkey(); iwVsq_[]L  
} FL|\D  
MW|*Z{6*  
BOOL CCaptureDlg::RegisterHotkey() BB9+d"Sq  
{ ud grZ/w]  
 UpdateData(); \?_M_5Nb  
 UCHAR mask=0; o)2KQ$b>Q  
 UCHAR key=0; C{<H)?]*BF  
 if(m_bControl) zg>)Lq|VsT  
  mask|=4; uB1>.Pvxb  
 if(m_bAlt) Wc HL:38  
  mask|=2; Da3Z>/S  
 if(m_bShift) tv 7"4$T  
  mask|=1; h1 npaD!  
  key=Key_Table[m_Key.GetCurSel()]; nRHxbE}::  
 if(bRegistered){ VV+gPC  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); xO_u  
  bRegistered=FALSE; 8\VP)<<  
 } {9Ug9e{ ~  
 cMask=mask; AW <"3 !@  
 cKey=key; ZBuh(be  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); :9~LYJ ?  
 return bRegistered; P _x(`H  
} 2 r';)8:  
=n ff;Xu  
  四、小结 ss0`9:z  
E (.~[-K4  
  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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