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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: TD9;kN1`  
  1 I*7SkgKv  
  一、实现方法 z9p05NFH  
3 HIz9F(  
  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: Rt{B(L.?<  
OKP9CLg9  
#pragma data_seg("shareddata") &E4 0* (C  
HHOOK hHook =NULL; //钩子句柄 8>.J1C  
UINT nHookCount =0; //挂接的程序数目 ?  BE6  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 gi-Yqco  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 =r.mlc``W  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey @0eHS +  
static int KeyCount =0; <N`J`J-[  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 #_|sgS?1  
#pragma data_seg() zOSs[[  
rC7``#5  
  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。 2<][%> '  
F! X}(N?t  
  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: ` iJhG^w9M  
fsEzpUY:{W  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR h@@nR(<i  
cKey,UCHAR cMask) eXkujjSw"  
{ (__yh^h:m  
 BOOL bAdded=FALSE; JIFU;*PR1  
 for(int index=0;index<MAX_KEY;index++){ #CnHf  
  if(hCallWnd[index]==0){ nD0}wiL{  
   hCallWnd[index]=hWnd; I0'[!kBF|  
   HotKey[index]=cKey; Khe!g1=&X  
   HotKeyMask[index]=cMask; iajX~kv  
   bAdded=TRUE; L3p`  
   KeyCount++; 78Aa|AJU  
   break; $Y9jrR'w  
  } /\w)>0  
 } 'Vr$MaO  
 return bAdded; o d7]tOK9  
} xESjM1A)  
//删除热键 cDoo*  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $%%os6y2v  
{ +e-,ST&w(  
 BOOL bRemoved=FALSE; Yyfq  
 for(int index=0;index<MAX_KEY;index++){ g!`3{ /4  
  if(hCallWnd[index]==hWnd){ AWjm~D-?  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Rm5Kkzd0o  
    hCallWnd[index]=NULL; bO;(bE m@  
    HotKey[index]=0; e } *0ghKI  
    HotKeyMask[index]=0; ~=wC wA|1  
    bRemoved=TRUE; Dgql?+2$  
    KeyCount--; 9M /SH$Qy  
    break; `s]4AKBO  
   } =rd|0K"(r  
  } 4#(ZNP  
 } 9~0^PzTA  
 return bRemoved; DS2)@  
} oR~e#<$;  
97,rE$bC  
20TCG0% x  
  DLL中的钩子函数如下: bpkwn<7-  
lg}HGG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +xXH2b$wWC  
{ e8EfQ1 Ar  
 BOOL bProcessed=FALSE; gUAxyV  
 if(HC_ACTION==nCode) v`c$!L5  
 { v6GsoQmA   
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 jhGlG-^  
   switch(wParam) S\wW)Pv8  
   {  ;c -3g]  
    case VK_MENU: ;&b%Se@#p  
     MaskBits&=~ALTBIT; u0RS)&  
     break; %y<ejM  
    case VK_CONTROL: g2R@`./S  
     MaskBits&=~CTRLBIT; ya -i^i\  
     break; *<'M!iRC  
    case VK_SHIFT: o]LRzI  
     MaskBits&=~SHIFTBIT; / EMJSr  
     break; 1mSaS4!"B  
    default: //judge the key and send message O3N_\B:  
     break; C*X G_b ]  
   } 3p*-tBOO  
   for(int index=0;index<MAX_KEY;index++){ gFPi7 o1  
    if(hCallWnd[index]==NULL) = pIy  
     continue; hKlZi!4J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ` r']^ ,  
    { Ao7`G':  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); aVe/ gE  
     bProcessed=TRUE; GOSI3RRn  
    } _0pO8o-x  
   } q+a.G2S  
  } Qpt&3_   
  else if((lParam&0xc000ffff)==1){ //有键按下 zTD@  
   switch(wParam) <8 #ObdY!  
   { l+wc '= ]  
    case VK_MENU: 8z<r.joxC  
     MaskBits|=ALTBIT; DXQi-+?  
     break; %g cc y|  
    case VK_CONTROL: S*"u/b;  
     MaskBits|=CTRLBIT; -Z^4L  
     break; CkRX>)=py  
    case VK_SHIFT: zQH]s?v  
     MaskBits|=SHIFTBIT; t/Z:)4Z  
     break; p8+/\Ee]B  
    default: //judge the key and send message ~"!a9GZ  
     break; @-#T5?  
   } -Y:ROoFOZ  
   for(int index=0;index<MAX_KEY;index++){ DJQglt}~  
    if(hCallWnd[index]==NULL) ArI]`h'W  
     continue; }Uf<ZXW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uD[ "{?H  
    { *o' 4,+=am  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ecX/K.8l  
     bProcessed=TRUE; !]S=z^"<  
    } -qebQv  
   } l SkEuN  
  } 3^.8.q(6  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 \NXQ  
   for(int index=0;index<MAX_KEY;index++){ *C,N'M<u  
    if(hCallWnd[index]==NULL) /.=r>a }l  
     continue; 2 [!Mx&^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) P` '$  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); OK`Z@X_,bW  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 D22Lu ;E  
   } q2_`v5t  
  } t]^_ l$  
 } ,fnsE^}.U  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); c-5jYwV  
} E/za @W  
1]\TI7/ n  
  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: b0a}ME&1  
L8V3BH7B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?Ay3u^X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (Q-I8Y8l8  
qi+&|80T.  
  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: Cj&$%sO1  
vv 7+ >%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) hteOh#0{   
{ 9b6!CNe!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) =Mhg  
 { PaVO"y]C  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 b4 hIeBI\  
  SaveBmp(); 9.0WKcwg  
  return FALSE; =p&sl;PsLw  
 } 4w{-'M.B  
 …… //其它处理及默认处理 eO{@@?/y  
} kb|eQtH  
bZ# X 9fT  
'Kis hXOn]  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 aed+C:N  
lug} Uj  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 *\LyNL(  
ARx0zI%N  
  二、编程步骤 JCQ:+eqt  
-NDi5i\  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; _ K/swT{f  
O}gX{_|6  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 8Z:Ezg3^  
3 Lje<KzL  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ^'B-sz{{  
u3Do~RyL[  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 7C5pAb:  
X&\o{w9%  
  5、 添加代码,编译运行程序。 id?_>9@P  
4uX(_5#j  
三、程序代码 f[qPG&  
ypA:  P  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL EDN(eh(_  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) +{6`F1MO  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ xeB4r/6  
#if _MSC_VER > 1000 ZPF7m{S  
#pragma once Lht[g9  
#endif // _MSC_VER > 1000 uu>lDvR*  
#ifndef __AFXWIN_H__ (/fT]6(  
#error include 'stdafx.h' before including this file for PCH )C}KR`"  
#endif lcig7%  
#include "resource.h" // main symbols e}Q>\t45  
class CHookApp : public CWinApp B~_Spp  
{ j@ C0af  
 public: dYyW]nZ&  
  CHookApp(); ~Oh=   
  // Overrides g+9v$[!  
  // ClassWizard generated virtual function overrides !BRcq~-.  
  //{{AFX_VIRTUAL(CHookApp) @*_ZoO7{  
 public: & zgPN8u  
  virtual BOOL InitInstance(); q2!'==h2i  
  virtual int ExitInstance(); dwp: iM  
  //}}AFX_VIRTUAL )nnCCR S6  
  //{{AFX_MSG(CHookApp) L*O>IQh2  
  // NOTE - the ClassWizard will add and remove member functions here. XTj73 MWY  
  // DO NOT EDIT what you see in these blocks of generated code ! !~d'{sy6  
  //}}AFX_MSG Yzd2G,kZ=  
  DECLARE_MESSAGE_MAP() Y*\6o7  
}; a*Jn#Mx<M  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Uk02IOXQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ! o^Ic`FhS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cno;>[$  
BOOL InitHotkey(); -,/3"}<^78  
BOOL UnInit(); 9>{t}I d  
#endif <~O}6HQ#  
3`rIV*&_{  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. eKJ:?Lxv;  
#include "stdafx.h" M,JA;a, _  
#include "hook.h" !a4cjc(  
#include <windowsx.h> !u%9;>T7  
#ifdef _DEBUG Oc^m_U8>^  
#define new DEBUG_NEW 6oA~J]<  
#undef THIS_FILE !3HsI| $<G  
static char THIS_FILE[] = __FILE__; 7(@(Hm  
#endif &<=e_0zT  
#define MAX_KEY 100 `A"Q3sf%  
#define CTRLBIT 0x04 A: c]1  
#define ALTBIT 0x02 bpnv&EG  
#define SHIFTBIT 0x01 nF j-<!  
#pragma data_seg("shareddata") -? Tz.y&  
HHOOK hHook =NULL; 3]_qj*V  
UINT nHookCount =0; d|3o/@k  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey +l.|kkZ?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ` #=fA  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey (s Jq;Z  
static int KeyCount =0; k)i"tpw  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift hU)'OKe  
#pragma data_seg() X/wmKi  
HINSTANCE hins; C{)HlOW  
void VerifyWindow(); FbBX}n  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) |f3U%2@  
//{{AFX_MSG_MAP(CHookApp) 1XGG.+D  
// NOTE - the ClassWizard will add and remove mapping macros here. 3!bK d2"  
// DO NOT EDIT what you see in these blocks of generated code! .c:)Qli  
//}}AFX_MSG_MAP 1w bTqc  
END_MESSAGE_MAP() J& )#G@fRX  
k%^<}s@  
CHookApp::CHookApp() ~ z>BfL  
{ Wk,6) jS=}  
 // TODO: add construction code here, i[8NO$tN1)  
 // Place all significant initialization in InitInstance b^%?S8]h  
} gjQ=8&i  
vi<X3G6Xh  
CHookApp theApp; }/4 9T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?n&$m  
{ _l<| 1nH  
 BOOL bProcessed=FALSE; QS5H >5M)  
 if(HC_ACTION==nCode) .P8-~?&M  
 { mw ?{LT  
  if((lParam&0xc0000000)==0xc0000000){// Key up D-~G|8g  
   switch(wParam) -$OD}5ku#  
   { -}<d(c  
    case VK_MENU: :;q>31:h  
     MaskBits&=~ALTBIT; BL0 |\&*1  
     break; 2J)74SeH  
    case VK_CONTROL: /<6ywLD  
     MaskBits&=~CTRLBIT; \ U Ax(;  
     break; 6{ C Fe|XN  
    case VK_SHIFT: [pr 9 $Jr  
     MaskBits&=~SHIFTBIT; &7fY_~)B  
     break; T6,V  
    default: //judge the key and send message % <^[j^j}o  
     break; G{/;AK  
   } pK<%<dIc  
   for(int index=0;index<MAX_KEY;index++){ 6GY32\Ac  
    if(hCallWnd[index]==NULL) z;U LQ  
     continue; kAY@^vi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z6NJ)XQy6F  
    { K q/~T7Ru  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Uld_X\;Q4  
     bProcessed=TRUE; 9e-*JYF]C  
    } u >81dO]H  
   } xJ N|w\&  
  } 'N*!>mZ<  
  else if((lParam&0xc000ffff)==1){ //Key down jk K#e$7  
   switch(wParam) cJSVT8  
   { //~POm  
    case VK_MENU: 9jqO/_7R+  
     MaskBits|=ALTBIT; 6aRGG+H  
     break; P$6W`^D Z  
    case VK_CONTROL: 2rF?Q?$,B  
     MaskBits|=CTRLBIT; 4|FRg  
     break; NP$e-" 1  
    case VK_SHIFT: *&(2`#C;  
     MaskBits|=SHIFTBIT; @X K>  
     break; N?\bBt@  
    default: //judge the key and send message E]\D>[0O  
     break; :m]/u( /N  
   } g'KzdG`O0  
   for(int index=0;index<MAX_KEY;index++) >'eB2  
   { t3pZjdLJd  
    if(hCallWnd[index]==NULL) HE*7\"9  
     continue; (QhG xuC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .V8/ELr]  
    { D&4u63^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); yI3Q|731)  
     bProcessed=TRUE; JL?Cnk$!  
    } 45?*:)l:  
   } ||yXp2  
  } -l\~p4U  
  if(!bProcessed){ g[m3IJzq  
   for(int index=0;index<MAX_KEY;index++){ -,FK{[h]ka  
    if(hCallWnd[index]==NULL) 6#-6Bh)>4  
     continue; oSN8Xn*qr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 8mk}nex  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 1P+Mv^%I  
   } *~"zV`*Q  
  } oG+K '(BB  
 } AGl|>f)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); zhuy ePn  
} i/5y^  
g@<sU0B  
BOOL InitHotkey() wEBtre7  
{ zt-'SY  
 if(hHook!=NULL){ 7fap*  
  nHookCount++; c9\B[@-q  
  return TRUE; os}b?I*K  
 } O|HIO&M  
 else <sgZ3*,A  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); \_lG#p|  
  if(hHook!=NULL) o9_(DJ<{  
   nHookCount++; _=o1?R  
  return (hHook!=NULL); Ko1AaX(I'+  
} Oyi;bb<#  
BOOL UnInit() =''mpIg(  
{ nu#aa#ex>  
 if(nHookCount>1){ <P+G7!KZ&  
  nHookCount--; hZp=BM"bJ  
  return TRUE; 8]sTX9  
 } 'q{PtYr  
 BOOL unhooked = UnhookWindowsHookEx(hHook); >(IITt  
 if(unhooked==TRUE){ }%-UL{3%  
  nHookCount=0; ]cx"  
  hHook=NULL; /d{glOk  
 } QN)/,=#  
 return unhooked; 8W19#?7>B  
} T [i7C3QS  
M,.b`1-w  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jz|Wj  
{ ybD{4&ZE  
 BOOL bAdded=FALSE; l4iuu  
 for(int index=0;index<MAX_KEY;index++){ C>.]Bvg  
  if(hCallWnd[index]==0){ Py|H? ,6=  
   hCallWnd[index]=hWnd; i0,%}{`  
   HotKey[index]=cKey; Ul '~opf  
   HotKeyMask[index]=cMask; .'l.7t  
   bAdded=TRUE; Zk~nB}Xw  
   KeyCount++; 0t5Q9#RY  
   break; s,1pZT <E  
  } a9yIV5_N  
 } ArNur~  
 return bAdded; 2(c<U6#C'l  
} c'4>D,?1  
@?<N +qdH>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &/B2)l6a  
{ F3k C"H  
 BOOL bRemoved=FALSE; S% JNxT7'  
 for(int index=0;index<MAX_KEY;index++){ &,W_#l{  
  if(hCallWnd[index]==hWnd){ D}zOuB,S  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^m6k@VM  
    hCallWnd[index]=NULL; Gl?P.BCW.&  
    HotKey[index]=0; k)H[XpM  
    HotKeyMask[index]=0; LVPt*S=/  
    bRemoved=TRUE; ke3HK9P;  
    KeyCount--; - XE79 fQ  
    break; Fy}MXe"f  
   } xT_fr,P  
  } .yctE:n  
 } ^/`#9]<%  
 return bRemoved; Y0/jH2n  
} '_q: vjX  
_Vdb?  
void VerifyWindow() @D.R0uM  
{ Bg+<*z-?e  
 for(int i=0;i<MAX_KEY;i++){ F|]o9&/<]  
  if(hCallWnd!=NULL){ ATYQ6E[{MV  
   if(!IsWindow(hCallWnd)){ AIvL#12  
    hCallWnd=NULL; 7,V!Iv^X  
    HotKey=0; <.PPs:{8#  
    HotKeyMask=0; MZUF! B  
    KeyCount--; pm'@2dT  
   } QOkE\ro  
  } Z$OF|ZZQ  
 } E3CiZ4=5  
} "TBQNWZ  
Hj5WJ{p.  
BOOL CHookApp::InitInstance() 4 |:Q1  
{ Vu|Br  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); -V;0_Nx7p  
 hins=AfxGetInstanceHandle(); )8 "EI-/.  
 InitHotkey(); ,<uiitOo  
 return CWinApp::InitInstance(); l5\B2 +}7  
} :$SRG^7md  
/%J&/2Wz  
int CHookApp::ExitInstance() < "L){$  
{ ?)Czl4J  
 VerifyWindow(); ]YisZE4s  
 UnInit(); RE`J"&  
 return CWinApp::ExitInstance(); 9A/Kn]s(jj  
} M `9orq<  
} #\;np  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file E<zT  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) v@$evmA  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 'f=)pc#&g  
#if _MSC_VER > 1000 !LHzY(  
#pragma once #lBpln9  
#endif // _MSC_VER > 1000 t_dw}I   
?l\gh1{C  
class CCaptureDlg : public CDialog %# Wg^l '  
{ p:[`%<j0  
 // Construction ? BHWzo!  
 public: 1WUFk?p  
  BOOL bTray; | Q1ub S  
  BOOL bRegistered; ecY ^C3+S  
  BOOL RegisterHotkey(); @n~>j&Kp  
  UCHAR cKey; 4i[v ew  
  UCHAR cMask; CfkNy[}=  
  void DeleteIcon(); eB<V%,%N#  
  void AddIcon(); 9%3 r-U=  
  UINT nCount; F$6])F  
  void SaveBmp(); dPH! V6r  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Uf7F8JZmM  
  // Dialog Data <\}Y@g8  
  //{{AFX_DATA(CCaptureDlg) fcE/  
  enum { IDD = IDD_CAPTURE_DIALOG }; 7U{b+=,wK  
  CComboBox m_Key; i">z8?qF  
  BOOL m_bControl; G!e}j @@  
  BOOL m_bAlt; u'$yYzBE  
  BOOL m_bShift; pU:C =hq4  
  CString m_Path; x;ICV%g/  
  CString m_Number; K+h9bI/Sf  
  //}}AFX_DATA DmXDg7y7s  
  // ClassWizard generated virtual function overrides @Q$ /eL  
  //{{AFX_VIRTUAL(CCaptureDlg) r3c\;Ra7  
 public: MuFU?3ovG*  
  virtual BOOL PreTranslateMessage(MSG* pMsg);  z~}StCH(  
 protected: 7+D'W7Yx  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support j^aQ>(t(9  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); D)O6| DiO  
  //}}AFX_VIRTUAL h-2E9Z  
  // Implementation OU)p)Y_z  
 protected: mf*9^}l+Zn  
  HICON m_hIcon; ZHiICh|et%  
  // Generated message map functions uhw5O9  
  //{{AFX_MSG(CCaptureDlg) +/@ZnE9s  
  virtual BOOL OnInitDialog(); RK~FT/  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); w}U5dM`  
  afx_msg void OnPaint(); I7G\X#,iz  
  afx_msg HCURSOR OnQueryDragIcon(); m mJ)m  
  virtual void OnCancel(); XZep7d}  
  afx_msg void OnAbout(); [KimY  
  afx_msg void OnBrowse(); G3_mWppH  
  afx_msg void OnChange(); YA;8uMqh;  
 //}}AFX_MSG XD+cs.{5  
 DECLARE_MESSAGE_MAP() px [1#*  
}; 5QL9 w3L  
#endif -aH?7HV}  
XY+aunLf  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file -X&!dV:= 4  
#include "stdafx.h" J++sTQ(!?  
#include "Capture.h" "f&i 251  
#include "CaptureDlg.h" ?) ,xZ1"  
#include <windowsx.h> St3(1mApl  
#pragma comment(lib,"hook.lib") W kDn  
#ifdef _DEBUG Iu1Sj`A  
#define new DEBUG_NEW 3|83Jnh  
#undef THIS_FILE t0asW5f  
static char THIS_FILE[] = __FILE__; c>U{,z  
#endif G7_"^r%c9;  
#define IDM_SHELL WM_USER+1 wWOT*R_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); B yy-Cc  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); o. V0iS]  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; , R.+-X  
class CAboutDlg : public CDialog P2 K>|r  
{ -YRL>]1  
 public: YW$x:  
  CAboutDlg(); M;p q2$   
  // Dialog Data !(ux.T0  
  //{{AFX_DATA(CAboutDlg) >D p6@%  
  enum { IDD = IDD_ABOUTBOX }; X^ ^?}>t[  
  //}}AFX_DATA 1&@wb'MBs.  
  // ClassWizard generated virtual function overrides "mP*}VF  
  //{{AFX_VIRTUAL(CAboutDlg) p=`x  
 protected: hml\^I8Q>F  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #`vGg9  
  //}}AFX_VIRTUAL ILr6W@o5A  
  // Implementation ^pQ;0[9Y0  
 protected: vn%U;}  
  //{{AFX_MSG(CAboutDlg) &W!d}, ;  
  //}}AFX_MSG a5U2[Ko80  
  DECLARE_MESSAGE_MAP() bF Y)o Z  
}; /<?X-IDz.{  
m"|(w`n]E+  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) *Xt c`XH  
{ Acq>M^E3  
 //{{AFX_DATA_INIT(CAboutDlg) ^0ZKHR(}e  
 //}}AFX_DATA_INIT j=jrzG+`  
} 6dS1\Y  
Znh uIA AG  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) KEVy%AP=*h  
{ 7Yw\%}UL  
 CDialog::DoDataExchange(pDX); !DX/^b  
 //{{AFX_DATA_MAP(CAboutDlg) $Z7|t  
 //}}AFX_DATA_MAP 6m{$rBR  
} ux 79"5qb  
dI0>m:RBz  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) hA,rSq  
 //{{AFX_MSG_MAP(CAboutDlg) XF f+efh  
 // No message handlers #L4Kwy  
 //}}AFX_MSG_MAP SiuO99'nV  
END_MESSAGE_MAP() norc!?L  
k89gJ5B$  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) (+Kof  
: CDialog(CCaptureDlg::IDD, pParent) '3_B1iAv  
{ zUUxxS_?  
 //{{AFX_DATA_INIT(CCaptureDlg) _~S^#ut+  
  m_bControl = FALSE; W Pp\sIP  
  m_bAlt = FALSE; ^1Zq0  
  m_bShift = FALSE; p|9ECdU>;  
  m_Path = _T("c:\\"); dG~B3xg;5i  
  m_Number = _T("0 picture captured."); #&2N,M!Q  
  nCount=0; sv{0XVn+^  
  bRegistered=FALSE; ^Lv ^W  
  bTray=FALSE; %J ( }D7-,  
 //}}AFX_DATA_INIT b}U&bFl  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 f_P+qm  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Oi%~8J>  
} @~U6=(+  
]Y: W[p  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) $?A Uk  
{ dZiWVa  
 CDialog::DoDataExchange(pDX); u*-<5& X  
 //{{AFX_DATA_MAP(CCaptureDlg) 2hA66ar{$  
  DDX_Control(pDX, IDC_KEY, m_Key); +i_f.Ipp  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); / -qt}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); BM$tywC  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); , a_{ Y+  
  DDX_Text(pDX, IDC_PATH, m_Path); H.mQbD`X  
  DDX_Text(pDX, IDC_NUMBER, m_Number); @61N[  
 //}}AFX_DATA_MAP ^s2-jkK  
} FZ.z'3I  
Ty4%du6?d  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) -"dy z(  
//{{AFX_MSG_MAP(CCaptureDlg) |9"^s x  
 ON_WM_SYSCOMMAND() yb.|7U?/x  
 ON_WM_PAINT() 4C9"Q,o%&  
 ON_WM_QUERYDRAGICON() R6@~   
 ON_BN_CLICKED(ID_ABOUT, OnAbout) a~eLkWnh<k  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) @?cXa: tX  
 ON_BN_CLICKED(ID_CHANGE, OnChange) GxBPEIim  
//}}AFX_MSG_MAP w@$o  
END_MESSAGE_MAP() *rFbehfH  
)%@WoBRj  
BOOL CCaptureDlg::OnInitDialog() FjLv*K[#d  
{ . N} }cJq  
 CDialog::OnInitDialog(); @NwM+^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); f{5| }PL  
 ASSERT(IDM_ABOUTBOX < 0xF000); TNT"2FoBd  
 CMenu* pSysMenu = GetSystemMenu(FALSE); GKx,6E#JM  
 if (pSysMenu != NULL) @P5@ &G  
 { VJtTbt;>  
  CString strAboutMenu; 2gR_1*|  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ~rJw$v  
  if (!strAboutMenu.IsEmpty()) otH[?c?BT  
  { )qP{X,Uf  
   pSysMenu->AppendMenu(MF_SEPARATOR); :!YJ3:\  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); I)%jPH:ua  
  } OO+#KyU   
 } v4a4*rBI"  
 SetIcon(m_hIcon, TRUE); // Set big icon V?z{UZkR  
 SetIcon(m_hIcon, FALSE); // Set small icon vyOC2c8  
 m_Key.SetCurSel(0); KY34 'Di  
 RegisterHotkey(); 7{6.  
 CMenu* pMenu=GetSystemMenu(FALSE); o-<_X&"a|5  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); w |FV qX  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); QOy&!6  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); z.Kq}r^  
 return TRUE; // return TRUE unless you set the focus to a control qg:I+"u  
} 4e\`zy  
Fl3r!a!P,  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) X*yp=qI  
{ c7Qa !w  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Ollv _o3  
 { '{k Nbx51  
  CAboutDlg dlgAbout; YeVc,B'  
  dlgAbout.DoModal(); ~ 2oP,  
 } : It W|  
 else 2bxMIr  
 { H;Qn?^  
  CDialog::OnSysCommand(nID, lParam); q]%bd[zkz  
 } Fsj&/: q  
} vA-p} ]%  
Fj('l  
void CCaptureDlg::OnPaint() jz7ltoP  
{ Vd>.fb\U2  
 if (IsIconic()) u#,'ys  
 { w:xKgng=L  
  CPaintDC dc(this); // device context for painting +4nR&1z$  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); .EZ{d  
  // Center icon in client rectangle D#[ :NXahn  
  int cxIcon = GetSystemMetrics(SM_CXICON); (E(:F[.S  
  int cyIcon = GetSystemMetrics(SM_CYICON); j/mp.'P1k  
  CRect rect; +Q]'kJ<s  
  GetClientRect(&rect); ugPI1'f  
  int x = (rect.Width() - cxIcon + 1) / 2; +Qvgpx>  
  int y = (rect.Height() - cyIcon + 1) / 2; EI+/%.,  
  // Draw the icon zd4y5/aoS  
  dc.DrawIcon(x, y, m_hIcon); v!hs~DnUZ  
 } mqT0^TNPcl  
 else xt0j9{p  
 { T`{MQ:s  
  CDialog::OnPaint(); et}Y4,:  
 } \'=}kk`  
} Tv)y }  
g*.(! !  
HCURSOR CCaptureDlg::OnQueryDragIcon() m_I$"ge  
{ vK7,O%!S  
 return (HCURSOR) m_hIcon; ^J~4~!  
} m$qC 8z]  
?JTyNg4<  
void CCaptureDlg::OnCancel() >d V@9  
{ Vzm+Ew _  
 if(bTray) h`rjDd  
  DeleteIcon(); W&f Py%g  
  CDialog::OnCancel(); R:^?6f<Z}  
} +p<R'/  
=>%%]0  
void CCaptureDlg::OnAbout() B^Mtj5Oc  
{ :!!`!*!JH  
 CAboutDlg dlg; /G+gk0FW  
 dlg.DoModal(); (jFE{M$-  
} lj*913aFh  
Z9~Wlt'?  
void CCaptureDlg::OnBrowse() [F{a-i-  
{ z9O/MHT[w  
 CString str; |Z|xM  
 BROWSEINFO bi; <qY>d,+E'  
 char name[MAX_PATH]; EXzNehO~e  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); gc[J.[  
 bi.hwndOwner=GetSafeHwnd(); uCS  
 bi.pszDisplayName=name; B4&pBiG&f6  
 bi.lpszTitle="Select folder"; pAmI ](  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; u$p|hd d  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); gdY/RDxn:  
 if(idl==NULL) DC7}Xly(  
  return; =U`c }dhS  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >g0@ Bk  
 str.ReleaseBuffer(); 'X<uG x  
 m_Path=str; e-)1K  
 if(str.GetAt(str.GetLength()-1)!='\\') tSa%ZkS  
  m_Path+="\\"; <r3n?w8  
 UpdateData(FALSE); H,` XCG  
} ^V]DY!@k3_  
k T>}(G||  
void CCaptureDlg::SaveBmp() :E`l(sI7J}  
{ h l'k_<a*  
 CDC dc; 6ng g*kE<  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); j&GKpt  
 CBitmap bm; K): sq{  
 int Width=GetSystemMetrics(SM_CXSCREEN); :#jv4N  
 int Height=GetSystemMetrics(SM_CYSCREEN); .cog9H'  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 'p]qN;`'O$  
 CDC tdc; 0\*<k`dY  
 tdc.CreateCompatibleDC(&dc); %$ ?Q%  
 CBitmap*pOld=tdc.SelectObject(&bm); d's`~HOU2  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *3Z#r  
 tdc.SelectObject(pOld); gg_(%.>  
 BITMAP btm; "T=LHjE  
 bm.GetBitmap(&btm); x:lf=D lA  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; l= S_#  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); FuBRb(I  
 BITMAPINFOHEADER bih; ^- Ji]5~  
 bih.biBitCount=btm.bmBitsPixel; W<7Bq_L[|  
 bih.biClrImportant=0; YU(x!<Z  
 bih.biClrUsed=0; qrYeh`Mv  
 bih.biCompression=0; `2  
 bih.biHeight=btm.bmHeight; >[=`{B  
 bih.biPlanes=1; *.l=> #qF  
 bih.biSize=sizeof(BITMAPINFOHEADER); ka%pS  
 bih.biSizeImage=size; ox#4|<qM  
 bih.biWidth=btm.bmWidth; z# B) b5  
 bih.biXPelsPerMeter=0; 1bs95Fh9Q  
 bih.biYPelsPerMeter=0; d^^>3L!h  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Lr&BZM  
 static int filecount=0; hJN A%  
 CString name; ohk =7d.'  
 name.Format("pict%04d.bmp",filecount++); f` J"A:  
 name=m_Path+name; -.{7;6:(k  
 BITMAPFILEHEADER bfh; ,CF~UX% bU  
 bfh.bfReserved1=bfh.bfReserved2=0; ^KR(p!%  
 bfh.bfType=((WORD)('M'<< 8)|'B'); p?nVPTh  
 bfh.bfSize=54+size; u\?u}t v  
 bfh.bfOffBits=54; 75i)$}_1B  
 CFile bf; wX;NU4)n  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ P 'k39  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER));  ond/e&1  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); iJeT+}  
  bf.WriteHuge(lpData,size); }clNXtN  
  bf.Close(); 5]+eLKXB  
  nCount++; &>{L"{  
 } | 'G$}]H  
 GlobalFreePtr(lpData); v}@ 6"\  
 if(nCount==1) 2&#iHv  
  m_Number.Format("%d picture captured.",nCount); 30"G%DFd  
 else + P.Ir  
  m_Number.Format("%d pictures captured.",nCount); ;ecF~-oku  
  UpdateData(FALSE); ElxbHQj6  
} 8~&v\GDkF  
rD?o97  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]A[~2]  
{ C?k4<B7V  
 if(pMsg -> message == WM_KEYDOWN) IRB;Q(Z   
 { ?zqXHv#x  
  if(pMsg -> wParam == VK_ESCAPE) Gr?gHAT  
   return TRUE; P6rL;_~e  
  if(pMsg -> wParam == VK_RETURN) S)?B  I  
   return TRUE; m`aUz}Y>c  
 } JG4I-\+H  
 return CDialog::PreTranslateMessage(pMsg); F!8425oAw  
} F{H y@7  
d[de5Xra  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0c) 19Ig  
{ YQJ_t@0C  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [ ]NAV  
  SaveBmp(); QH:i)v*  
  return FALSE; V,}cDT>  
} uIBV1Qz  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ lM]7@A  
 CMenu pop; a*`J]{3G  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); $[e*0!e  
 CMenu*pMenu=pop.GetSubMenu(0); $ a7^3  
 pMenu->SetDefaultItem(ID_EXITICON); 2J$Uz,@  
 CPoint pt; 'yqp   
 GetCursorPos(&pt); w*0T"hK  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); U*t `hn-xs  
 if(id==ID_EXITICON) f,*e?9@;s  
  DeleteIcon(); y|ZJ-[qg  
 else if(id==ID_EXIT) ?(N(8)G1  
  OnCancel(); j*nCIxF  
 return FALSE; 3%k+<ho(  
} N?p $-{  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); )erPp@  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) DpAuI w7|  
 AddIcon(); #0tM88Wi  
 return res; MwZ`NH|n3"  
} nr}H;wB  
v{+*/NQ_  
void CCaptureDlg::AddIcon() +%^D)   
{ fO+;%B  
 NOTIFYICONDATA data; va)\uXW.N  
 data.cbSize=sizeof(NOTIFYICONDATA); -z@}:N-uR  
 CString tip; <GC:aG  
 tip.LoadString(IDS_ICONTIP); G[<iVt$y  
 data.hIcon=GetIcon(0); TG($l2  
 data.hWnd=GetSafeHwnd(); s_|wvOW)'  
 strcpy(data.szTip,tip); 4YJs4CB  
 data.uCallbackMessage=IDM_SHELL; rmhB!Lo  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ;X>KP,/r$  
 data.uID=98; /D~:Ufw  
 Shell_NotifyIcon(NIM_ADD,&data); Vs(;al'  
 ShowWindow(SW_HIDE); yl*S|= 8;k  
 bTray=TRUE; U i;o/Z3  
} 6Dch+*4*@  
>13=4S  
void CCaptureDlg::DeleteIcon() }  ?  
{ :98Pe6  
 NOTIFYICONDATA data; > 2$M~to"1  
 data.cbSize=sizeof(NOTIFYICONDATA); _\"?:~rUN  
 data.hWnd=GetSafeHwnd(); k0,~wn\#h  
 data.uID=98; #Ew}@t9  
 Shell_NotifyIcon(NIM_DELETE,&data); /[mCK3_  
 ShowWindow(SW_SHOW); Q8O38uZ  
 SetForegroundWindow(); 6sntwT"?  
 ShowWindow(SW_SHOWNORMAL); )g-*fSa  
 bTray=FALSE; <[*s%9)'9  
} b`IC)xN$  
b]Jh0B~Y  
void CCaptureDlg::OnChange() YVzK$k'3U  
{ f -#fi7  
 RegisterHotkey(); v{I:Wxe  
} TE/2}XG)  
}=++Lr4*  
BOOL CCaptureDlg::RegisterHotkey() m{' q(w}  
{ }b44^iL$9y  
 UpdateData(); <I} k%q'  
 UCHAR mask=0; mu*wX'.'  
 UCHAR key=0; jjs-[g'}  
 if(m_bControl) "<kmiK/  
  mask|=4; xv /w %  
 if(m_bAlt) TJCoID7a8  
  mask|=2; 1m&(3% #{  
 if(m_bShift) UrgvG, Lt  
  mask|=1; }/6jom9U?  
  key=Key_Table[m_Key.GetCurSel()]; ~-,<`VY  
 if(bRegistered){ - Q,lUP  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5dhRuc  
  bRegistered=FALSE; F3?v&  
 } V&gUxS]*  
 cMask=mask; :Y"f .>  
 cKey=key; 4ed( DSN  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); KzhldMJ^zq  
 return bRegistered; @wB$qd;v  
} % Dya-  
EF}Z+7A  
  四、小结 X)Kd'6zg  
H>VuUH|  
  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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