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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: SN4Q))dAU  
  ]E  =Iu  
  一、实现方法 [E#UGJ@  
XwV'Ha  
  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: %r&-gWTQ,  
4Mk-2 Dx  
#pragma data_seg("shareddata") gaA<}Tp,  
HHOOK hHook =NULL; //钩子句柄 s9dO,FMs0t  
UINT nHookCount =0; //挂接的程序数目 i)#:qAtP*  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 m}>F<;hQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ^F?&|clM/  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 1qV@qz  
static int KeyCount =0; H|cNH=  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 eC5$#,HiC  
#pragma data_seg() #%J5\+ua  
$+.l*]  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 NmMIQ@K  
;8!Z5H  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ~|wbP6</:-  
?+T^O?r|O  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR >]o}}KF?  
cKey,UCHAR cMask) .0R v(Y  
{ s2j['g5  
 BOOL bAdded=FALSE; {3N'D2N  
 for(int index=0;index<MAX_KEY;index++){  L4uFNM]  
  if(hCallWnd[index]==0){ OL_{_K(w  
   hCallWnd[index]=hWnd; Bgmn2-  
   HotKey[index]=cKey; iC iZJ"  
   HotKeyMask[index]=cMask; 5[j`6l  
   bAdded=TRUE; T~h5B(J;  
   KeyCount++; "c}@V*cO<d  
   break; <~ JO s2  
  } 3\T2?w9u(  
 } 52upoU>}2  
 return bAdded; f|u#2!7  
} 7JSNYTH  
//删除热键 =^ T\Xs;GK  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jA#/Z  
{ [r/k% <  
 BOOL bRemoved=FALSE; j~j\\Y  
 for(int index=0;index<MAX_KEY;index++){ hHqh{:q{v  
  if(hCallWnd[index]==hWnd){ Kx_h1{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]Qm]I1P  
    hCallWnd[index]=NULL; wP,JjPUt  
    HotKey[index]=0; fDx9iHGv  
    HotKeyMask[index]=0; nx0K$ Ptq  
    bRemoved=TRUE; +cU>k}  
    KeyCount--; <0S=,!  
    break; LJoGpr 8  
   } V.wqZ {G  
  } dMR3)CO  
 }  +H$!a  
 return bRemoved; pRSOYTebP  
} Xl74@wq   
2w)-\/j}  
4 Jx"A\5*G  
  DLL中的钩子函数如下: 1~ $);US  
!n^OM?.4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Vb BPB5 $q  
{ BB|?1"neg  
 BOOL bProcessed=FALSE; VY)s+Bx  
 if(HC_ACTION==nCode) \@&_>us  
 { %e&9.  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 kA7mLrON  
   switch(wParam) H(Eh c  
   {  I@\OaUGr+  
    case VK_MENU: }^B6yWUN  
     MaskBits&=~ALTBIT; 9)VF 1LD  
     break; Y2'cs~~$Ce  
    case VK_CONTROL: ]~Y<o  
     MaskBits&=~CTRLBIT; T6ENtp  
     break; )?wJF<[_#  
    case VK_SHIFT: ?k(\ApVHj  
     MaskBits&=~SHIFTBIT; ws^4?O  
     break; )& u5IA(  
    default: //judge the key and send message -(K9s!C!.  
     break; ~)(\6^&=|  
   } vOg#Dqn-  
   for(int index=0;index<MAX_KEY;index++){ ,]T2$?|  
    if(hCallWnd[index]==NULL) 'w1YFdW  
     continue; E@Ad'_H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .KdyJ6o  
    { s=[h?kB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,!U=|c"k)  
     bProcessed=TRUE; &IlU|4`R%  
    } `Qeg   
   } VE8;sGaJ  
  } 0@AAulRl  
  else if((lParam&0xc000ffff)==1){ //有键按下 *-xU2  
   switch(wParam) fw[y+Bi& ?  
   { Qyy.IPTP  
    case VK_MENU: kY'T{Sm1^  
     MaskBits|=ALTBIT; Li Kxq=K  
     break; UT="2*3gz  
    case VK_CONTROL: ;t+ub8  
     MaskBits|=CTRLBIT; &5: tn=E  
     break; K(q-?n`<  
    case VK_SHIFT: *YlV-C<}W"  
     MaskBits|=SHIFTBIT; >$2V%};  
     break; WVLHfkN  
    default: //judge the key and send message 1IVuSp`{FU  
     break; tY <Z'xA?  
   } hdVdcnM  
   for(int index=0;index<MAX_KEY;index++){ <jed!x  
    if(hCallWnd[index]==NULL) a5w:u5  
     continue; 'MY/*k7:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D.mHIsX6\  
    { /JT#^Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); a.z;t8  
     bProcessed=TRUE; @/ k@WhFZ  
    } gJM`[x`T  
   } &d|r~NhP  
  } H@l}WihW  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 !fj(tPq  
   for(int index=0;index<MAX_KEY;index++){ ZI=v.wa  
    if(hCallWnd[index]==NULL) "U7qo}`I  
     continue; 5YrBW:_OI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }*L(;r)q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); PiA0]>  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Q~T$N  
   } {P*m;a`}  
  } YQY%M>F@d%  
 } 3$X'Y]5a  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Q f@  
} '} $Dgp6e  
G\(|N9^:  
  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: 8(* [Fe9  
F8apH{&t  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 50={%R  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2p " WTd  
p/h Rk<K6  
  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: 4R\ Hpt  
\eFR(gO+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [Jv@J\  
{ AnT3M.>ek  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) p|]\P%,\  
 { tPF.r  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 J_;o|gqX  
  SaveBmp(); ? YG)I;(  
  return FALSE; G.UI|r /Kz  
 } gg8Uo G  
 …… //其它处理及默认处理 *M"}z  
} Y0X-Zqk'  
%V nbmoO  
>FkWH7  
  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。 R2 V4#  
XcjRO#s\  
  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。 0L/n?bf  
9 yfJVg  
  二、编程步骤 q|),`.eh\  
^f(@gS}?  
  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"; V 0rZz  
4F{70"a  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; GP#aya  
ej"+:. "\e  
  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; 0vw4?>Jf@  
\o^2y.q:>  
  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; j*vYBGD  
#Q /Arq  
  5、 添加代码,编译运行程序。 =y-@AU8  
$b mLu=9  
三、程序代码 a0#J9O_  
(I./ Uu%  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 1 .6:#  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) .;N1N^  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ mrjswF27$o  
#if _MSC_VER > 1000 V=*wKuB  
#pragma once _D+J!f^  
#endif // _MSC_VER > 1000 X93!bB  
#ifndef __AFXWIN_H__ d}4Y(   
#error include 'stdafx.h' before including this file for PCH ZEx}$<)_  
#endif Ll4g[8  
#include "resource.h" // main symbols <q@a~'Ai?!  
class CHookApp : public CWinApp sL$:"=  
{ 7K98#;a)5  
 public: zld#qG6  
  CHookApp(); VFys.=  
  // Overrides H7DJ~z~J  
  // ClassWizard generated virtual function overrides mV pMh#zw  
  //{{AFX_VIRTUAL(CHookApp) # }y2)g  
 public: BGX.U\uc  
  virtual BOOL InitInstance(); {.INnFGP@)  
  virtual int ExitInstance(); nX`u[ks  
  //}}AFX_VIRTUAL @nCd  
  //{{AFX_MSG(CHookApp) +csi[c)3E  
  // NOTE - the ClassWizard will add and remove member functions here. 1waTTT?"Ho  
  // DO NOT EDIT what you see in these blocks of generated code ! [wzb<"kW  
  //}}AFX_MSG s|y "WDyx5  
  DECLARE_MESSAGE_MAP() z.;ez}6%V  
}; 71t* %  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); lp^<3o*1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ev}C<zk*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #*UN >X  
BOOL InitHotkey(); $[a8$VY^Cm  
BOOL UnInit(); 0a XPPnuX  
#endif  ^0 \  
Y<%@s}zc  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.  UWo]s.  
#include "stdafx.h" '?p<lu^^B  
#include "hook.h" XLrwxj0  
#include <windowsx.h> }*S `qW;B  
#ifdef _DEBUG $arK(  
#define new DEBUG_NEW YF>m$?;  
#undef THIS_FILE #6HA\dE  
static char THIS_FILE[] = __FILE__; 2$ze= /l  
#endif wG-HF'0L  
#define MAX_KEY 100 85Otss/mM  
#define CTRLBIT 0x04 R[hzMU}KB  
#define ALTBIT 0x02 4J/}]Dr5  
#define SHIFTBIT 0x01 4?q <e*W  
#pragma data_seg("shareddata") >]vlkA(  
HHOOK hHook =NULL; 2OVRf0.R~  
UINT nHookCount =0; waj0"u^#  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey =E#%'/ A;c  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT vkEiOFU!u  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey sW'2+|3"  
static int KeyCount =0; +Z !)^j  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ;"~ fZ2$U  
#pragma data_seg() x#xFh0CA  
HINSTANCE hins; j~jV'f.:H  
void VerifyWindow(); =*c7i]@}  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) .7avpOfz  
//{{AFX_MSG_MAP(CHookApp) )9"_J9G  
// NOTE - the ClassWizard will add and remove mapping macros here. r\-uJ~8N  
// DO NOT EDIT what you see in these blocks of generated code! 'O_3)x5  
//}}AFX_MSG_MAP L"1}V  
END_MESSAGE_MAP() /)}q Xx&  
PuA9X[=  
CHookApp::CHookApp() K1+)4!}%U  
{ BMG3|N^  
 // TODO: add construction code here, xg;+<iW  
 // Place all significant initialization in InitInstance YSic-6z0Ms  
} DN-+osPi  
q=Sgk>NA  
CHookApp theApp; RbP6F*f  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) '}Z~JYa0  
{ sHt].gZ  
 BOOL bProcessed=FALSE; lvBx\e;7P  
 if(HC_ACTION==nCode) koZ*+VP=  
 { ( +Q&[E"87  
  if((lParam&0xc0000000)==0xc0000000){// Key up g4=pnK8  
   switch(wParam) c|B.n]Z  
   { !h23cj+V  
    case VK_MENU: xy/`ZS2WPq  
     MaskBits&=~ALTBIT; {E9+WFz5  
     break; 7WkB>cn  
    case VK_CONTROL: V k  K  
     MaskBits&=~CTRLBIT; ^cP!\E-^  
     break; ;Q OBBF3HG  
    case VK_SHIFT: g"p%C:NN  
     MaskBits&=~SHIFTBIT; 4~Vx3gEV:  
     break; i]YV {  
    default: //judge the key and send message %,}A@H ,  
     break; -w}]fb2Q>  
   } C'.L20qW  
   for(int index=0;index<MAX_KEY;index++){ z"-u95H  
    if(hCallWnd[index]==NULL) * K D I}B>  
     continue; r%yvOF\>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~=6xyc/c  
    { +eK"-u~K  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); fzb29 -  
     bProcessed=TRUE; jET{Le8i  
    } hIs4@0  
   } (_mnB W  
  } DEG[Z7Ju  
  else if((lParam&0xc000ffff)==1){ //Key down F4}]b(L  
   switch(wParam) {JZZZY!n2  
   { QwJV S(Gs4  
    case VK_MENU: aQ?/%\>  
     MaskBits|=ALTBIT; ([T>.s  
     break; B}Z63|/N  
    case VK_CONTROL: V@e?#iz  
     MaskBits|=CTRLBIT; lYVz 3p  
     break; r3&G)g=u  
    case VK_SHIFT: *4Thd:7 `  
     MaskBits|=SHIFTBIT; \o}xF@sM5  
     break; vj'wm}/  
    default: //judge the key and send message z&#SPH*  
     break; `w#Oih!6A|  
   } I5 o)_nc  
   for(int index=0;index<MAX_KEY;index++) DBW[{D E  
   { OE_XCZ!5P  
    if(hCallWnd[index]==NULL) E4`N-3  
     continue; jSh5!6O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Vwg|K|  
    { qON|4+~u%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); >Ea8G,  
     bProcessed=TRUE; b#uL?f  
    } Bn=by{i  
   } .b3Qfxc>  
  } q@QksAq  
  if(!bProcessed){ B8.Pn  
   for(int index=0;index<MAX_KEY;index++){ Y>|B;Kj0(  
    if(hCallWnd[index]==NULL) 1->dMm}G[  
     continue; ,X[kt z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) a]JYDq`,3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /[a~3^Gs^  
   } Q3n,)M[N  
  } 63q^ $I  
 } .Xfq^'I[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); f/ ?_  
} 9_q#W'/X  
|4)>:d  
BOOL InitHotkey() HmiR.e%<b  
{ ^1S!F-H4\  
 if(hHook!=NULL){ 0t^M3+nc  
  nHookCount++; ?J%1#1L"/  
  return TRUE; B-?6M6#  
 } h;C5hU 4P  
 else L"E7#}  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 54gBJEhg  
  if(hHook!=NULL) $*^kY;  
   nHookCount++; ?Nup1 !D  
  return (hHook!=NULL); r54&XE]O  
} !POl;%\  
BOOL UnInit() 9A/\h3HrJ  
{ Hbj,[$Jb  
 if(nHookCount>1){ ^!<U_;+  
  nHookCount--; l7XUXbYp&=  
  return TRUE; 03|PYk 6EW  
 } ;;_,~pI?k  
 BOOL unhooked = UnhookWindowsHookEx(hHook); eV 2W{vuI  
 if(unhooked==TRUE){ TTeH `  
  nHookCount=0; 8;d:-Cp  
  hHook=NULL; {'XggI%  
 } R?GDJ3  
 return unhooked; gQo]  
} ;\a YlV-  
&v$rn#l  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) TC @s  
{ Ee)T1~;W  
 BOOL bAdded=FALSE; 6%'.A]"  
 for(int index=0;index<MAX_KEY;index++){ X^T:8npxt  
  if(hCallWnd[index]==0){ %zA;+s$l  
   hCallWnd[index]=hWnd; q 0$,*[PH  
   HotKey[index]=cKey; sNj)ZWgd>  
   HotKeyMask[index]=cMask; 3*]eigi)  
   bAdded=TRUE; *S]Ci\{_  
   KeyCount++; Q}1 R5@7  
   break; [=E  
  } 9%8"e>~  
 } gwOa$f%O  
 return bAdded; qIVx9jNN  
} -l`f)0{  
"oTHq]Ku  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) WB?jRYp  
{ Keuf9u  
 BOOL bRemoved=FALSE; di?K"Z>  
 for(int index=0;index<MAX_KEY;index++){ G^~k)6v=m  
  if(hCallWnd[index]==hWnd){ x^HGVWw_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ SFB~ ->db  
    hCallWnd[index]=NULL; ^"VJd[Hn  
    HotKey[index]=0; W}3.E "K  
    HotKeyMask[index]=0; "8c@sHk(w  
    bRemoved=TRUE; "w^!/  
    KeyCount--; xe#FUS 3  
    break; yyoqX"v[  
   } nc~F_i=  
  } s:OFVlC%\  
 } 1/RsptN"v  
 return bRemoved; aK&b{d  
} jK!Au  
FemC Lvu  
void VerifyWindow() NiWa7/Hr  
{ ;'?l$ ._  
 for(int i=0;i<MAX_KEY;i++){ G,$PV e*  
  if(hCallWnd!=NULL){ z{[xze-f  
   if(!IsWindow(hCallWnd)){ W 0(_ ~  
    hCallWnd=NULL; <A[E:*`*  
    HotKey=0; ~"!] 3C,L  
    HotKeyMask=0; AuUd e$l_  
    KeyCount--; Y,GU%[+  
   } _p# CwExuy  
  } CKtB-a  
 } " W!M[qBW  
} Fw/6?:C}O6  
C+?Hm1  
BOOL CHookApp::InitInstance() vqnw#U4`  
{ Ipf|")*  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); !,l9@eJQ  
 hins=AfxGetInstanceHandle(); m#8m] Y  
 InitHotkey(); c|lu&}BS  
 return CWinApp::InitInstance(); ?Y)vGlWDW<  
} tkVbo.[8K  
P7J>+cm  
int CHookApp::ExitInstance() $"`- ^  
{ 3!3xCO  
 VerifyWindow(); l]@&D#3ZM  
 UnInit(); $k|g"9  
 return CWinApp::ExitInstance(); J1/?JfF  
} BHd&yIyI  
k ]W[`  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file GT~)nC9f  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ZtV9&rd7  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ]Oh@,V8  
#if _MSC_VER > 1000 <p}R~zk  
#pragma once aHs^tPg  
#endif // _MSC_VER > 1000 6,"IDH|ND  
=CK4.   
class CCaptureDlg : public CDialog 5j:0Yt  
{ 4,..kSA3iw  
 // Construction h "Xg;(K  
 public: g+DzscIT  
  BOOL bTray; _6_IP0;  
  BOOL bRegistered; T#M,~lD  
  BOOL RegisterHotkey(); kv8Fko  
  UCHAR cKey; DamC F  
  UCHAR cMask; .9,zL=)Ba  
  void DeleteIcon(); 6$fHtJD:  
  void AddIcon(); m*ISa(#(,  
  UINT nCount; ]P#XVDn+;  
  void SaveBmp(); H70LhN  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor {SwQ[$k=_  
  // Dialog Data @'YS1N<  
  //{{AFX_DATA(CCaptureDlg) @L>q (Kg  
  enum { IDD = IDD_CAPTURE_DIALOG }; &/mA7Vf>eR  
  CComboBox m_Key; nS/)P4z  
  BOOL m_bControl; A&s:\3*Kh  
  BOOL m_bAlt; B,M(@5wz  
  BOOL m_bShift; UV5Ie!\nm  
  CString m_Path; EM]s/LD@%  
  CString m_Number; pM x  
  //}}AFX_DATA iDMJicW!+F  
  // ClassWizard generated virtual function overrides |\QgX%  
  //{{AFX_VIRTUAL(CCaptureDlg) 8S>&WR%jH]  
 public: 'I_Qb$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Z&0'a  
 protected: `^bgUmJ~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support K|Ld,bq  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); #6ri-n  
  //}}AFX_VIRTUAL + hn+K1  
  // Implementation W)9K`hM6  
 protected: }MRd@ 0-?!  
  HICON m_hIcon; 0QPH}Vi5}  
  // Generated message map functions dA@'b5N{"  
  //{{AFX_MSG(CCaptureDlg) f-}[_Y%;  
  virtual BOOL OnInitDialog(); Se HagKA  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 5Ycco,x  
  afx_msg void OnPaint(); *_R]*o!W'  
  afx_msg HCURSOR OnQueryDragIcon(); HOw -]JSP2  
  virtual void OnCancel(); $}lbT15a  
  afx_msg void OnAbout(); @.G[s)x  
  afx_msg void OnBrowse(); M(jgd  
  afx_msg void OnChange(); [P Q?#:r  
 //}}AFX_MSG "J+3w  
 DECLARE_MESSAGE_MAP() 3BB%Z 6F  
}; CF+_/s#j^  
#endif H,+I2tEs  
BDVHol*g  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file m-H-6`]  
#include "stdafx.h" 9;Itqe{8w  
#include "Capture.h" Gqcq,_?gt  
#include "CaptureDlg.h" !,[C] Q1  
#include <windowsx.h> Vnx,5E&  
#pragma comment(lib,"hook.lib") ?"zY" *>4  
#ifdef _DEBUG RQ'exc2x0  
#define new DEBUG_NEW 6:q"l\n>  
#undef THIS_FILE h.-@ F  
static char THIS_FILE[] = __FILE__; v3}L`dyh3  
#endif 5O~HWBX.  
#define IDM_SHELL WM_USER+1 ~n[xtWO0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HHq_P/'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G2t;DN(  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *NkA8PC  
class CAboutDlg : public CDialog 'rMN=1:iu"  
{ M&N B/  
 public: <@}I0  
  CAboutDlg(); f8M$45A'  
  // Dialog Data p!sWYui  
  //{{AFX_DATA(CAboutDlg) `!D s6  
  enum { IDD = IDD_ABOUTBOX }; CamE'  
  //}}AFX_DATA 1QmH{jM  
  // ClassWizard generated virtual function overrides T.Ryy"%F  
  //{{AFX_VIRTUAL(CAboutDlg) U>V&-kxtV  
 protected: >=UF-xk;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support w=LP"bqlI  
  //}}AFX_VIRTUAL MS0Fl|YA  
  // Implementation OR}c)|1  
 protected: 8<.C3m 6h  
  //{{AFX_MSG(CAboutDlg) N@O8\oQG  
  //}}AFX_MSG #<e\QE'!  
  DECLARE_MESSAGE_MAP() ZKQG:M~|  
}; @;<ht c  
jV? }9L^;  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) PQK(0iCo4  
{ k]5Bykf`Ky  
 //{{AFX_DATA_INIT(CAboutDlg) SV v;q?jZ  
 //}}AFX_DATA_INIT TJ: ]SB  
} h~(G$':^  
krsYog(^z  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) }?z@rt^  
{ 0Z0:,!  
 CDialog::DoDataExchange(pDX); qZ}P*+`Q  
 //{{AFX_DATA_MAP(CAboutDlg) deM7fN4lTi  
 //}}AFX_DATA_MAP aYuD>rD  
} %z#f.Ql  
= M]iIWQ@`  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) UB 6mqjPK  
 //{{AFX_MSG_MAP(CAboutDlg) K'X2dG*  
 // No message handlers A5i:x$ww  
 //}}AFX_MSG_MAP ~zSCg|"r  
END_MESSAGE_MAP() @+9<O0  
%^1cyk  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ,WvY$_#xW%  
: CDialog(CCaptureDlg::IDD, pParent) EL8NZ%:v:  
{ yaG= j  
 //{{AFX_DATA_INIT(CCaptureDlg)  .&9 i  
  m_bControl = FALSE; ]8T |f  
  m_bAlt = FALSE; hQ(qbt{e  
  m_bShift = FALSE; :6zG7qES3  
  m_Path = _T("c:\\"); %{/%mJoX  
  m_Number = _T("0 picture captured."); u%]shm  
  nCount=0; 2gzou|Y  
  bRegistered=FALSE; cs1l~bl  
  bTray=FALSE; FBpH21|/y  
 //}}AFX_DATA_INIT l5g$vh\aQ]  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 1j:Wh  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *^RmjW1I  
} MXzVgy  
"y_#7K  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) [5uRS}!  
{ 8F:e|\SB#  
 CDialog::DoDataExchange(pDX); HcedE3Rg  
 //{{AFX_DATA_MAP(CCaptureDlg) 6_d.Yfbq  
  DDX_Control(pDX, IDC_KEY, m_Key); wKi^C 8Z2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); u1z  
  DDX_Check(pDX, IDC_ALT, m_bAlt); mwY IJy[  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); J?Dq>%+ ^  
  DDX_Text(pDX, IDC_PATH, m_Path); # eCjn  
  DDX_Text(pDX, IDC_NUMBER, m_Number); *P 3V  
 //}}AFX_DATA_MAP `ORECg)  
} "=6v&G]U4  
E\IlF 6  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !'j?.F $}  
//{{AFX_MSG_MAP(CCaptureDlg) K-f1{ 0  
 ON_WM_SYSCOMMAND() `;l?12|X  
 ON_WM_PAINT() WdZ:K,  
 ON_WM_QUERYDRAGICON() m}8[#:  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) >~`r:0',  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) I j$lDJS  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ,_X /Gb6)  
//}}AFX_MSG_MAP 59zENUYl  
END_MESSAGE_MAP() zH>hx5,k'X  
@#P,d5^G  
BOOL CCaptureDlg::OnInitDialog() vjQb%/LWl  
{ ?Q-h n:F)  
 CDialog::OnInitDialog(); mk3_  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 5w\fSY  
 ASSERT(IDM_ABOUTBOX < 0xF000); 52b*[tZ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); NTS# sgP  
 if (pSysMenu != NULL) k6Uc3O  
 { u ~3%bJ]  
  CString strAboutMenu; vk>b#%1{  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ~}!3G  
  if (!strAboutMenu.IsEmpty()) ?[& 2o|  
  { u$D*tqxG  
   pSysMenu->AppendMenu(MF_SEPARATOR); MB%Q WU  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \~ BDm  
  } m$9w"8R  
 } quvanx V-L  
 SetIcon(m_hIcon, TRUE); // Set big icon /sr2mt-Q  
 SetIcon(m_hIcon, FALSE); // Set small icon W`"uu.~f  
 m_Key.SetCurSel(0); ?%VI{[y#>  
 RegisterHotkey(); -F=v6N{  
 CMenu* pMenu=GetSystemMenu(FALSE); yA)(*PFz  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); = pI?A^  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); TLd`1Ac  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [kqYfY?K  
 return TRUE; // return TRUE unless you set the focus to a control C-8qj>  
} _{Sm k [  
M:P0m6ie  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) R(-<BtM!-  
{ }BiiE%a  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) $2<d<Um~z  
 { ^/5XZ} *  
  CAboutDlg dlgAbout; #/NS&_Ge0s  
  dlgAbout.DoModal(); ,ZQZ}`x(  
 } <BO)E(  
 else !r`,=jK"  
 { 1Nu1BLPm  
  CDialog::OnSysCommand(nID, lParam); i 9g>9  
 } _;4 [Q1  
} n39t}`WIl  
.TE?KI   
void CCaptureDlg::OnPaint() \o\nr!=k  
{ >XOiu#kC  
 if (IsIconic()) U|HB=BP  
 { gr-fXZO  
  CPaintDC dc(this); // device context for painting h?-#9<A  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); (;%|-{7e-  
  // Center icon in client rectangle nuoPg3Nl  
  int cxIcon = GetSystemMetrics(SM_CXICON); TRZRYm"  
  int cyIcon = GetSystemMetrics(SM_CYICON); JT9N!CGZ  
  CRect rect; x Au/  
  GetClientRect(&rect); bW ZbG{Y.  
  int x = (rect.Width() - cxIcon + 1) / 2; W5^.-B,(K  
  int y = (rect.Height() - cyIcon + 1) / 2; x+]!m/  
  // Draw the icon BC,.^"fA6  
  dc.DrawIcon(x, y, m_hIcon); t+?P^Ok  
 } %+ FG,d  
 else DI`%zLDcY  
 { ,-+"^>  
  CDialog::OnPaint(); j F-v% ?  
 } X[2[!)Rk  
} 1xU3#b&2tC  
6{ ,HiY  
HCURSOR CCaptureDlg::OnQueryDragIcon() En&5)c+js4  
{ k|BHnj  
 return (HCURSOR) m_hIcon; vA)O {W\o  
} k8,?hX:  
s/:Fwr4q#a  
void CCaptureDlg::OnCancel() *cTO7$\[  
{ 8 4i_k  
 if(bTray) 3+J0!FVla  
  DeleteIcon(); v|ox!0:#  
  CDialog::OnCancel(); ;f,c't@w  
} JbO ~n )%x  
*_ +7ni  
void CCaptureDlg::OnAbout() Gn)y> AN  
{ <`!PCuR  
 CAboutDlg dlg; hUz[uyt  
 dlg.DoModal(); SEl#FWR  
} )2DQ>cm  
XhdSFxW}  
void CCaptureDlg::OnBrowse() xyH/e*a  
{ 8F)G7 H ,  
 CString str; 577:u<Yt  
 BROWSEINFO bi; NZN-^ >  
 char name[MAX_PATH]; ^v9|%^ug  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); YpUp@/"  
 bi.hwndOwner=GetSafeHwnd(); "4H8A =  
 bi.pszDisplayName=name; 5efxEt>U  
 bi.lpszTitle="Select folder"; g(O;{Q_  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ;WT{|z  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); m,')&{Rd  
 if(idl==NULL) 24Z]%+b*E  
  return; Pv<FLo%u<  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 4yaxl\2  
 str.ReleaseBuffer(); T\VNqs@  
 m_Path=str; x90jw$\%7  
 if(str.GetAt(str.GetLength()-1)!='\\') 5 cK@WE:  
  m_Path+="\\"; Px5t,5xT8  
 UpdateData(FALSE); -ng=l;  
} qQxz(}REu9  
.bf<<+'o  
void CCaptureDlg::SaveBmp() <DH*~tLp2  
{  n i  
 CDC dc; 9Q W&$n^  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); kC$&:\Rh  
 CBitmap bm; u)Q;8$`  
 int Width=GetSystemMetrics(SM_CXSCREEN); )a=/8ofe  
 int Height=GetSystemMetrics(SM_CYSCREEN); ^D@b;EyK  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ig0u^BC  
 CDC tdc; rVQX7l#YI  
 tdc.CreateCompatibleDC(&dc); rOD1_X-  
 CBitmap*pOld=tdc.SelectObject(&bm); _SZ5P>GIU  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); gQ~5M'#  
 tdc.SelectObject(pOld); +Ra3bjl  
 BITMAP btm; L;W.pe0  
 bm.GetBitmap(&btm); ql5x2n  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; OMihXt[  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Uz%Z&K  
 BITMAPINFOHEADER bih; $R8w+ Id  
 bih.biBitCount=btm.bmBitsPixel; n,P5o_^:  
 bih.biClrImportant=0; iy\KzoB  
 bih.biClrUsed=0;  17hTr  
 bih.biCompression=0; d~ng6pA  
 bih.biHeight=btm.bmHeight; K#K\-TR|$  
 bih.biPlanes=1; Aox3s?  
 bih.biSize=sizeof(BITMAPINFOHEADER); e=/&(Y  
 bih.biSizeImage=size; 0;~yZ?6_F  
 bih.biWidth=btm.bmWidth; 'ul\Q `N3  
 bih.biXPelsPerMeter=0; K8^kJSF\  
 bih.biYPelsPerMeter=0; ly4Qg\l  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 0"xPX#Cvj  
 static int filecount=0; rFJ[dz  
 CString name; %-;b u|  
 name.Format("pict%04d.bmp",filecount++); kvsA]tK.  
 name=m_Path+name; v7trr W}  
 BITMAPFILEHEADER bfh; `PI(%N  
 bfh.bfReserved1=bfh.bfReserved2=0; XeUC0K[D  
 bfh.bfType=((WORD)('M'<< 8)|'B'); daZQz"PP  
 bfh.bfSize=54+size; )_jSG5k  
 bfh.bfOffBits=54; =Pe><k  
 CFile bf; ED![^=  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Jd 3@cLCe-  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 7z~Ghz  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 9x~-*8aw  
  bf.WriteHuge(lpData,size); S+x_c4 T  
  bf.Close(); <o:@dS  
  nCount++; v.Ogf 5  
 } 5b #QYu  
 GlobalFreePtr(lpData); us)*2`?6t  
 if(nCount==1) ,[48Mspp  
  m_Number.Format("%d picture captured.",nCount); H!IDV }dn  
 else %4>x!{jwV  
  m_Number.Format("%d pictures captured.",nCount); ~hN~>0O  
  UpdateData(FALSE); c"gsB!xh  
} n l/UdgI  
"c`xH@D  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) xc'vS>&  
{ 1 H4fJ3-  
 if(pMsg -> message == WM_KEYDOWN) y@vj;3:  
 { 2%rLoL$Y2+  
  if(pMsg -> wParam == VK_ESCAPE) &hZwZgV +3  
   return TRUE; B(HT.%r^A  
  if(pMsg -> wParam == VK_RETURN) <"&'>?8j  
   return TRUE; t Y1Et0  
 } &m{'nRU}c  
 return CDialog::PreTranslateMessage(pMsg); 0.(<'!"y  
} Z/ bB h  
utO.WfWP  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) X} JOX9pK  
{ "HQF.#\#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ *FgJ|y6gk  
  SaveBmp(); CyM}Hc&w  
  return FALSE; Ya4?{2h@+  
} M^SuV  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2M6dMvS  
 CMenu pop; ~I_owCVZ  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 8<PKKDgbfd  
 CMenu*pMenu=pop.GetSubMenu(0); E[Bo4?s&^  
 pMenu->SetDefaultItem(ID_EXITICON); k&s; {|!  
 CPoint pt; XQ;I,\m  
 GetCursorPos(&pt); ~a+NJ6e1  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <O857 j  
 if(id==ID_EXITICON) jMpa?Jp1  
  DeleteIcon(); k 'zat3#f  
 else if(id==ID_EXIT) -l*A  
  OnCancel(); `<vxG4=62\  
 return FALSE; we]>(|  
} o42`z>~  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Pern*x9$  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) juno.$ 6  
 AddIcon(); ubGs/Vzye  
 return res; Y)p4]>lT+8  
} Gbb \h  
INNAYQ  
void CCaptureDlg::AddIcon() f]_mzF=&  
{ lmFA&s"m  
 NOTIFYICONDATA data; F1u)i  
 data.cbSize=sizeof(NOTIFYICONDATA); #\FT EY!  
 CString tip; Q-('5a19J  
 tip.LoadString(IDS_ICONTIP); :1<~}*B@{  
 data.hIcon=GetIcon(0); 3IyZunFT  
 data.hWnd=GetSafeHwnd(); Pz~q%J  
 strcpy(data.szTip,tip); H7e /  
 data.uCallbackMessage=IDM_SHELL; ?JqjYI{$  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; E$S`6+x`:a  
 data.uID=98; |`]oc,1h@  
 Shell_NotifyIcon(NIM_ADD,&data); |cTpw1%I~  
 ShowWindow(SW_HIDE); ' iQ9hQjD  
 bTray=TRUE; _X%Dw  
} yq*JdTF  
fi=?n{e'  
void CCaptureDlg::DeleteIcon() 9)ea.Gu  
{ <aVfJd/fT  
 NOTIFYICONDATA data; k=uZ=tUft*  
 data.cbSize=sizeof(NOTIFYICONDATA); sv=^k(d3  
 data.hWnd=GetSafeHwnd(); B_~jA%0m'  
 data.uID=98; P4%>k6X  
 Shell_NotifyIcon(NIM_DELETE,&data); f-+.;`H)T  
 ShowWindow(SW_SHOW); )Qr6/c 8}  
 SetForegroundWindow(); h3 @s2 fK  
 ShowWindow(SW_SHOWNORMAL); p{C9`wi)  
 bTray=FALSE; zD_H yGf  
} =~,l4g\  
n6cq\@~A  
void CCaptureDlg::OnChange() 5faj;I{%JY  
{ ZLJNw0!=|t  
 RegisterHotkey(); qY}Cg0[@g  
} W78o*z[O  
Kq7C0)23  
BOOL CCaptureDlg::RegisterHotkey() $^$ECDOTB  
{ HDj$"pS  
 UpdateData(); U"x~Jb3]O  
 UCHAR mask=0; $c9=mjwH  
 UCHAR key=0; )>$^wT  
 if(m_bControl) ,>S+-L8  
  mask|=4; b;{h?xc6  
 if(m_bAlt) oc;VIK)g]c  
  mask|=2; Hja^edLj  
 if(m_bShift) ay[ZsQC  
  mask|=1; ]L(54q;W  
  key=Key_Table[m_Key.GetCurSel()]; ,wT g$ g-$  
 if(bRegistered){ B/_6Ieb+  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); EIK*49b2  
  bRegistered=FALSE; sRi%1r7  
 } \^s2W:c  
 cMask=mask; ]wf |PU~nr  
 cKey=key; u:5IjOb2^  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $3:X+X  
 return bRegistered; )[ b#g(Y(  
} @LC~*_y   
UT;4U;a,m  
  四、小结 ~,Mr0  
dJE`9$jN  
  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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