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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: qv.s-@l8  
  Iju9#b6  
  一、实现方法 F!&$Z .  
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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: .FpeVjR''  
?I332,,q  
#pragma data_seg("shareddata") T43Jgk,  
HHOOK hHook =NULL; //钩子句柄 8zzY;3^h;  
UINT nHookCount =0; //挂接的程序数目 @PAT|6  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 2*ByVK  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 HGlQZwf  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ~l"]J'jF"H  
static int KeyCount =0; bn6WvC 3?  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 <3C/t|s  
#pragma data_seg() ,IDCbJ  
=`Lci1#pu}  
  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。 u+5MrS [  
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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: 1 paLxR5  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Lv m"!!  
cKey,UCHAR cMask) )uu1AbT +e  
{ 9vI<\ Xa  
 BOOL bAdded=FALSE; T1=T  
 for(int index=0;index<MAX_KEY;index++){ ZfP$6%;_  
  if(hCallWnd[index]==0){ SZ(]su:  
   hCallWnd[index]=hWnd; (]N- HN]v  
   HotKey[index]=cKey; qPF`=#  
   HotKeyMask[index]=cMask; cogIkB&Ju  
   bAdded=TRUE; ,u_ Z0S M  
   KeyCount++; u.dYDi  
   break; 2R];Pv  
  } 8(ej]9RObU  
 } )J{ .z   
 return bAdded; |Q+:vb:  
} '|^x[8^  
//删除热键 B nUWg ^E  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) W!t=9i  
{ ble[@VW|  
 BOOL bRemoved=FALSE; +FJ+,|i  
 for(int index=0;index<MAX_KEY;index++){ y7~y@2  
  if(hCallWnd[index]==hWnd){ o&ETs)n|  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ TQ5*z,CkS  
    hCallWnd[index]=NULL; ,8 G6q_ud  
    HotKey[index]=0; T7~H|%  
    HotKeyMask[index]=0; @L?KcGD  
    bRemoved=TRUE; 7BkY0_KK  
    KeyCount--; RG_.0'5=hc  
    break; B-UsMO  
   } F<TIZ^gFP  
  } #ADm^UT^  
 } vb`R+y@  
 return bRemoved; Ake@krh>$  
} SNtk1pG>  
<NWq0 3:&  
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  DLL中的钩子函数如下: Hg5 :>?Lw@  
+h08uo5c  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) nM| Cv  
{ oju,2kpH7#  
 BOOL bProcessed=FALSE; #f<3[BLx  
 if(HC_ACTION==nCode) S`8Iu[Ma  
 { 76cLf~|d~  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 50""n7I<%  
   switch(wParam) H)+QkQb}  
   {  w)C5XX30;  
    case VK_MENU: S#:l17e3  
     MaskBits&=~ALTBIT; N@0cn q:"  
     break; ny1;]_X_  
    case VK_CONTROL: pZz\o  
     MaskBits&=~CTRLBIT; _;M3=MTM9  
     break; ,pIh.sk7s*  
    case VK_SHIFT: /mXxj93UA  
     MaskBits&=~SHIFTBIT; lFl(Sww!\  
     break; # /Bg5:  
    default: //judge the key and send message % :h %i|  
     break; iD*L<9  
   } -}_1f[b  
   for(int index=0;index<MAX_KEY;index++){ $C{,`{=  
    if(hCallWnd[index]==NULL) pO92cGJ8  
     continue; LU/;` In  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) EpH_v`  
    { |'-%d^ Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); R.!.7dO  
     bProcessed=TRUE; N "}N>xe2  
    } Ej8g/{  
   } _\na9T~g  
  } F?^L^N^  
  else if((lParam&0xc000ffff)==1){ //有键按下 :gO5#HIm  
   switch(wParam)  />6ECT  
   { &~=r .T  
    case VK_MENU: Zm0'p!  
     MaskBits|=ALTBIT; 9dm oB_G  
     break; Dxy^r*B  
    case VK_CONTROL: XBoq/kbw!  
     MaskBits|=CTRLBIT; t{s*,X\b  
     break; 5|5p -B  
    case VK_SHIFT: HuJc*op-6  
     MaskBits|=SHIFTBIT; flT6y-d  
     break; XO+rg&Pu  
    default: //judge the key and send message /,`OF/%  
     break; WdH/^QvTP  
   } qVfl6q5  
   for(int index=0;index<MAX_KEY;index++){ K)U[xS;<  
    if(hCallWnd[index]==NULL) inip/&P?V  
     continue; `/^ _W <  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M*f]d`B  
    { P?S]Q19Q4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 5vg="@O K  
     bProcessed=TRUE; (zh[1[a  
    } tva=DS  
   } NBHpM}1xtU  
  } C~R ?iZ.&U  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 f ,4erTBH  
   for(int index=0;index<MAX_KEY;index++){ . P+Qu   
    if(hCallWnd[index]==NULL) MqJ5|C.q  
     continue; t1]/Bw`j/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Vd(n2JMtG  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \ 'Va(}v  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 #*:^\z_Jd  
   } $xWUzg1<U  
  } Qe{w)e0}`  
 } `XpQR=IOMb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 8CZ%-}-%$  
} k/D{&(F ~  
5'c#pm\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: 4Y$\QZO  
5C&*PJ~WA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4hODpIF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); SiUu**zC  
$rI 1|;^  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 1[T7;i$  
Qn,6s%n  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _&/ {A|n  
{ a6-.|tt#t  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) r0 )ne|&Hp  
 { 1Dl6T\20  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 > (9\ cF{  
  SaveBmp(); g4 eW<  
  return FALSE; 3 ye  
 } x-e6[_F  
 …… //其它处理及默认处理 Lm=;Y6'`N  
} X fqhD&g  
Xh>($ U  
?:ZB'G{%E  
  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。 }Uwji  
DL?nvH  
  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。 vj]>X4'i  
g (WP  
  二、编程步骤 //_H _ue$  
4A6Yl6\Y  
  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"; 3TH?7wi  
V*{rHp{=p  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; .z.4E:Iq  
5OppK(Oi*C  
  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; ZGDT 6,  
@J"tM.  
  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; VOLj#H  
l6&\~Z(  
  5、 添加代码,编译运行程序。 avL_>7q  
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三、程序代码 V@!)Pw  
4uo`XJuQ  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL [104;g <  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) a9z#l}IQ  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ m^G(qoZ]  
#if _MSC_VER > 1000 P0jr>j@^-  
#pragma once yB2h/~+  
#endif // _MSC_VER > 1000 {VE h@yn  
#ifndef __AFXWIN_H__ z.!N|"4yr  
#error include 'stdafx.h' before including this file for PCH L_NiU;cr%  
#endif e[fOm0^.c  
#include "resource.h" // main symbols *B"Y]6$  
class CHookApp : public CWinApp Z(T{K\)uN  
{ RHg-Cg`  
 public: . \"k49M`  
  CHookApp(); 0{|HRiQH9+  
  // Overrides k=hWYe$iAz  
  // ClassWizard generated virtual function overrides `daqzn  
  //{{AFX_VIRTUAL(CHookApp) iU;e!\A  
 public: ||_hET  
  virtual BOOL InitInstance(); m|;(0 rft  
  virtual int ExitInstance(); -juG[zn  
  //}}AFX_VIRTUAL uv27Vos  
  //{{AFX_MSG(CHookApp) YR9fw  
  // NOTE - the ClassWizard will add and remove member functions here. A913*O: \  
  // DO NOT EDIT what you see in these blocks of generated code ! Ki2!sADd  
  //}}AFX_MSG 3/@z4:p0R  
  DECLARE_MESSAGE_MAP() -f)fiQ-<  
}; FT@uZWgQ=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); M  9t7y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  b.&W W  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); rtRbr_  
BOOL InitHotkey(); S3E,0%yo+)  
BOOL UnInit(); xi=ApwNj  
#endif pn gto  
TZAd{EZa  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. G @..?>  
#include "stdafx.h" $/++afi m  
#include "hook.h" {`QHg O  
#include <windowsx.h> [|DKBJ  
#ifdef _DEBUG .B# .   
#define new DEBUG_NEW (Q^sK\  
#undef THIS_FILE 0N.h:21(4  
static char THIS_FILE[] = __FILE__; !hBpon  
#endif 4hL%J=0:  
#define MAX_KEY 100 bf"'xn9  
#define CTRLBIT 0x04 i#]e&Bru5  
#define ALTBIT 0x02 mm-s?+&M;  
#define SHIFTBIT 0x01 ZgP%sF  
#pragma data_seg("shareddata")  uZS:  
HHOOK hHook =NULL; CJBf5I3  
UINT nHookCount =0; V&M*,#(?  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey QPJ \Iu@D$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT elOeXYO0  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey G%<}TI1}  
static int KeyCount =0; Nr~$i%[  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift N{;!xI v  
#pragma data_seg() ;sZG=y@  
HINSTANCE hins; s[yWBew  
void VerifyWindow(); G*fo9eu5$  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Wwq:\C  
//{{AFX_MSG_MAP(CHookApp) z)qYW6o%  
// NOTE - the ClassWizard will add and remove mapping macros here. tS'lJu  
// DO NOT EDIT what you see in these blocks of generated code! / (&E  
//}}AFX_MSG_MAP 7A)\:k  
END_MESSAGE_MAP() Km` SR^&\  
jT{T#_  
CHookApp::CHookApp() sgX!4wG&Z  
{ 2bp@m;g$  
 // TODO: add construction code here, LL^KZ-  
 // Place all significant initialization in InitInstance K4c:k; V  
} Jz}nV1G(jz  
#DTKz]i?  
CHookApp theApp; rs&]46i/p  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) q$Gs;gz^(  
{ VY0.]t  
 BOOL bProcessed=FALSE; n~N>;m P  
 if(HC_ACTION==nCode) ]gk1q{Ql<  
 { ze+YQ F  
  if((lParam&0xc0000000)==0xc0000000){// Key up RP4/:sO  
   switch(wParam) yB b%#GW  
   { uJ !&T  
    case VK_MENU: Ms{";qiG  
     MaskBits&=~ALTBIT; ,XD" p1(|G  
     break; N:1aDr;  
    case VK_CONTROL: Kg[OUBv  
     MaskBits&=~CTRLBIT; 'wND  
     break; .DCHc,DxA  
    case VK_SHIFT:  0#,a#P  
     MaskBits&=~SHIFTBIT; 8Bf >  
     break; /{i~CGc ;"  
    default: //judge the key and send message _4ag-'5  
     break; 6>>; fy2  
   } Kc/1LeAik  
   for(int index=0;index<MAX_KEY;index++){ rhJ&* 0M  
    if(hCallWnd[index]==NULL) e~o!Qm  
     continue; AjC:E+g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :t}\%%EbmE  
    { R'Sd'pSDN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); h)KHc/S  
     bProcessed=TRUE; jEc_!Q  
    } YG "Ta|@5  
   } L:R4&|E/t  
  } {f/qI`  
  else if((lParam&0xc000ffff)==1){ //Key down f-ltV<C_  
   switch(wParam) *c0H_8e  
   { @T'^V0!-q:  
    case VK_MENU: t un}rdb  
     MaskBits|=ALTBIT; Ot=jwvw  
     break; #@XBHJD\#  
    case VK_CONTROL: l& :EKh  
     MaskBits|=CTRLBIT; .Ro/ioq  
     break; LD$5KaOW  
    case VK_SHIFT: Z*,e<zNQ  
     MaskBits|=SHIFTBIT; Av X1*  
     break; N'Gq9A  
    default: //judge the key and send message XHr*Rs.[=  
     break; w+M/VsL  
   } {!"UBALxc  
   for(int index=0;index<MAX_KEY;index++) *$tXm4 O[  
   { 3<0b_b  
    if(hCallWnd[index]==NULL) )DSeXS[ e  
     continue; +>ju,;4WK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fqNh\~kja  
    { [GwAm>k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -9Q(3$}  
     bProcessed=TRUE; L kt4F  
    } LU1I `E  
   } h<9s& p  
  } pu-HEv}]a|  
  if(!bProcessed){ eV;r /4  
   for(int index=0;index<MAX_KEY;index++){ th?+TNb^  
    if(hCallWnd[index]==NULL) {15j'Qwm  
     continue; vgfC{]v<W]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^_7|b[Bt  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); oV|O`n  
   } -t`kb*O3`  
  } !`69.v  
 } 9:j?Jvw$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Ox3=1M0  
} k(gbUlCc  
K9!HW&?<|  
BOOL InitHotkey() }LHYcNw^z  
{ ^&zCPUH  
 if(hHook!=NULL){ =|t-0'RsN  
  nHookCount++; UhxM85M;x  
  return TRUE; X Xque-  
 } dkQ4D2W*\  
 else (jc@8@Wo.  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); <2$vo  
  if(hHook!=NULL) y Zaf q"o  
   nHookCount++; j\2Qe %d  
  return (hHook!=NULL); SSK}'LQ  
} ?=u?u k<-  
BOOL UnInit() )M0YX?5A R  
{ r`H}f#.KR  
 if(nHookCount>1){ #M,&g{  
  nHookCount--; gf|uZ9{  
  return TRUE; u'YXI="(  
 } |z-f 8$  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Y:^hd809  
 if(unhooked==TRUE){ /cjz=r1U>  
  nHookCount=0; ]\, ?u /  
  hHook=NULL; _NDQ2O  
 } uP~,]ci7  
 return unhooked; <Ap_#  
} B8&q$QV  
Gh;\"Qx  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l;?:}\sI=  
{ pUIN`ya[[  
 BOOL bAdded=FALSE; Q(|@&83].  
 for(int index=0;index<MAX_KEY;index++){ A8{jEJ=)P  
  if(hCallWnd[index]==0){ ZmA}i`  
   hCallWnd[index]=hWnd; rrD6x>  
   HotKey[index]=cKey; TdhfX{nk  
   HotKeyMask[index]=cMask; TxrW69FV7  
   bAdded=TRUE; I _nQTWcm  
   KeyCount++; "1O_h6 C  
   break; n,N->t$i  
  } #bOv}1,s  
 } M/ 3;-g  
 return bAdded; m\:^9A4HCg  
} MZgaQUg  
Y teIp'T  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _4{0He`q  
{ 73Dxf -  
 BOOL bRemoved=FALSE; !:{Qbv&T  
 for(int index=0;index<MAX_KEY;index++){ wNB?3v{n  
  if(hCallWnd[index]==hWnd){ ^<;W+dWdU  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ AHf 9H?  
    hCallWnd[index]=NULL; tUu ' gs|  
    HotKey[index]=0; 7Cz~nin>7  
    HotKeyMask[index]=0; 26V6Y2X  
    bRemoved=TRUE; T(!1\TB  
    KeyCount--; *zrT;j G  
    break; m&)/>'W   
   } rH}|~  
  } 7HkO:/  
 } eI8o#4nT  
 return bRemoved; * #yF`_p  
} aDS:82GMQ  
lrrTeE*  
void VerifyWindow() *G"hjc$L  
{ X3:1KDVsV  
 for(int i=0;i<MAX_KEY;i++){ "~r<ZG  
  if(hCallWnd!=NULL){ t]xz7VQ  
   if(!IsWindow(hCallWnd)){ &3vm @  
    hCallWnd=NULL; >,6  
    HotKey=0; ak7%  
    HotKeyMask=0; dc$zW^i  
    KeyCount--; Y3~Uz#`SU  
   } r=j?0k '}]  
  } 5i br1zs  
 } Yy~x`P'g!  
} e$L C  
9Po>laT 5  
BOOL CHookApp::InitInstance() $z=a+t *  
{ ~d*Q{v~3  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); AD;m[u7  
 hins=AfxGetInstanceHandle(); :Drf]D(sMX  
 InitHotkey(); P~7(x7/7~  
 return CWinApp::InitInstance(); lMv6QL\>'  
} 2/SUEnaLy_  
g[cnaS|?  
int CHookApp::ExitInstance() u#6s^ )W  
{ [s}W47N1  
 VerifyWindow(); wgz]R  
 UnInit(); *q}yfa35eR  
 return CWinApp::ExitInstance(); ydWr&E5  
} It*U"4lgi  
aB%.]bi  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file T{prCM  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) | BaEv\$K  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ h;=~%2Y  
#if _MSC_VER > 1000 F:zmO5L5  
#pragma once ?e%*q^~Cu  
#endif // _MSC_VER > 1000 )U/Kz1U  
L7ae6#5.  
class CCaptureDlg : public CDialog >s<Bu'r  
{ N8]DzE0%  
 // Construction [I;C 6p  
 public: U|wST&rU|  
  BOOL bTray; 2j f!o  
  BOOL bRegistered; ;CO qu#(  
  BOOL RegisterHotkey(); F=\ REq  
  UCHAR cKey; r1~W(r.x  
  UCHAR cMask; nJ2B*(S'v.  
  void DeleteIcon(); m mF0RNE  
  void AddIcon(); p39$V[*g(  
  UINT nCount; wOH:'sk["  
  void SaveBmp(); Q g/Rw4[  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor gj|5"'g%  
  // Dialog Data B4 bB`r  
  //{{AFX_DATA(CCaptureDlg) mJ%^`mrI  
  enum { IDD = IDD_CAPTURE_DIALOG }; <*vR_?!  
  CComboBox m_Key; F`KXG$  
  BOOL m_bControl; KKwM\   
  BOOL m_bAlt; VjM/'V5  
  BOOL m_bShift; JCH9~n.  
  CString m_Path; UV(`.  
  CString m_Number; x@ X2r  
  //}}AFX_DATA h<L_ =)lH  
  // ClassWizard generated virtual function overrides o0WwlmB5  
  //{{AFX_VIRTUAL(CCaptureDlg) ybpOk  
 public: ) [eTZg  
  virtual BOOL PreTranslateMessage(MSG* pMsg); _J*l,]}S  
 protected: qt:B]#j@  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0 Rb3| te  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); WOPIF~1v  
  //}}AFX_VIRTUAL , S^y>  
  // Implementation #-%D(=&I  
 protected: M|nLD+d~8  
  HICON m_hIcon; E2|M#Y  
  // Generated message map functions Av.`'.b  
  //{{AFX_MSG(CCaptureDlg) "= 2\kZ  
  virtual BOOL OnInitDialog(); [__P-h{J  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2fdN@iruB  
  afx_msg void OnPaint(); Zl[EpXlZ  
  afx_msg HCURSOR OnQueryDragIcon(); oW OR7)?r  
  virtual void OnCancel(); tOXyle~C  
  afx_msg void OnAbout(); *vQ 6LF;y  
  afx_msg void OnBrowse(); FOD'&Yb&  
  afx_msg void OnChange(); FM%WMyb[  
 //}}AFX_MSG "IS; o o$g  
 DECLARE_MESSAGE_MAP() ,3rsjoKhd  
}; #@nPB.  
#endif !"FEp  
aP(~l_  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file aGW O3Nk  
#include "stdafx.h" N?3p,2  
#include "Capture.h" i`YZ;L L  
#include "CaptureDlg.h" G%Lt>5*!nE  
#include <windowsx.h> TFldYKd/l  
#pragma comment(lib,"hook.lib") <e&v[  
#ifdef _DEBUG M19O^P>[  
#define new DEBUG_NEW 0aq{Y7sYU  
#undef THIS_FILE J+CGhk  
static char THIS_FILE[] = __FILE__; 4~Q<LEly  
#endif p7+>]sqX  
#define IDM_SHELL WM_USER+1 !pfpT\i]N:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); C!_=L?QT^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); eG+$~\%Fub  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; `?T::&`  
class CAboutDlg : public CDialog YS4"TOFw  
{ Q?hf2iw  
 public: %#fjtbeB  
  CAboutDlg(); ka=A:biz  
  // Dialog Data 1/bTwzR.g  
  //{{AFX_DATA(CAboutDlg) &R/-~w5  
  enum { IDD = IDD_ABOUTBOX }; nVlZ_72d  
  //}}AFX_DATA 4]}d'x&  
  // ClassWizard generated virtual function overrides yC@PMyE]  
  //{{AFX_VIRTUAL(CAboutDlg) H.hKh  
 protected: "#36-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4iSN.nxIZ  
  //}}AFX_VIRTUAL EqHToD I3  
  // Implementation Ag3+z+uS  
 protected: LD{~6RP  
  //{{AFX_MSG(CAboutDlg) Nnn~7  
  //}}AFX_MSG ,nog6\  
  DECLARE_MESSAGE_MAP() Na]ITCVR  
}; -~sW@u)O  
p%Q{Rqc)  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) a^G>|+8  
{ ']Czn._  
 //{{AFX_DATA_INIT(CAboutDlg) |-v/  
 //}}AFX_DATA_INIT Lcg1X3$G  
} ^-Ks_4  
6wOj,}2Mn  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6ImW |%  
{ Dd OK&  
 CDialog::DoDataExchange(pDX); ]c\`EHN  
 //{{AFX_DATA_MAP(CAboutDlg) p]e.E`'S  
 //}}AFX_DATA_MAP dtQ3iuV %  
} Yjy%MR  
$Q|6W &?[;  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) @CPkP  
 //{{AFX_MSG_MAP(CAboutDlg) lq 1223  
 // No message handlers ~urk Uz  
 //}}AFX_MSG_MAP .K_50 %s  
END_MESSAGE_MAP() Ug[0l)  
2#R0Bd  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) O|v8.3[cT  
: CDialog(CCaptureDlg::IDD, pParent) 3nq4Y'  
{ uw>y*OLU+  
 //{{AFX_DATA_INIT(CCaptureDlg) wlwgYAD  
  m_bControl = FALSE; -hK^*vJ  
  m_bAlt = FALSE; hZ>1n&[ @  
  m_bShift = FALSE; V+u0J"/8  
  m_Path = _T("c:\\"); n>o=RQ2  
  m_Number = _T("0 picture captured."); P=ubCS'  
  nCount=0; !}d_$U$  
  bRegistered=FALSE; 1<]?@[l<  
  bTray=FALSE; UHI<8o9  
 //}}AFX_DATA_INIT 5uM`4xkj  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ![[:Z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Q2gz\N  
} @Y%i`}T%(  
AB.ZmR9|  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 2"Ki5  
{ }F_=.w0  
 CDialog::DoDataExchange(pDX); _nIt4l7  
 //{{AFX_DATA_MAP(CCaptureDlg) AHplvksb  
  DDX_Control(pDX, IDC_KEY, m_Key); opReAU'I  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); _BND{MsX  
  DDX_Check(pDX, IDC_ALT, m_bAlt); K!tM "`a  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); e$-Y>Dd  
  DDX_Text(pDX, IDC_PATH, m_Path); g0s *4E  
  DDX_Text(pDX, IDC_NUMBER, m_Number); AR)A <  
 //}}AFX_DATA_MAP GS,}]c=  
} 9!Bz)dJ 3  
 )jH|j  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) U5;Y o+z  
//{{AFX_MSG_MAP(CCaptureDlg) Oz5Ze/HBN  
 ON_WM_SYSCOMMAND() 1{CVd m<9  
 ON_WM_PAINT()  :D  
 ON_WM_QUERYDRAGICON() xtd1>|  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) q!) nSD  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) )#Id=c  
 ON_BN_CLICKED(ID_CHANGE, OnChange) j>O!|V  
//}}AFX_MSG_MAP ej]>*n  
END_MESSAGE_MAP() q[~+Zm  
8sU}[HH*1  
BOOL CCaptureDlg::OnInitDialog() IoxdWQ4]A  
{ 9{R88f?;  
 CDialog::OnInitDialog(); (+.R8  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); MgQb" qx  
 ASSERT(IDM_ABOUTBOX < 0xF000); $$---Y   
 CMenu* pSysMenu = GetSystemMenu(FALSE); :w26d-QR(  
 if (pSysMenu != NULL) 3W@ta1  
 { K;~I ;G  
  CString strAboutMenu; u [LsH  
  strAboutMenu.LoadString(IDS_ABOUTBOX); tzG.)Uqs  
  if (!strAboutMenu.IsEmpty()) joJQ?lG  
  { Ft 2u&Rtx  
   pSysMenu->AppendMenu(MF_SEPARATOR); C <q@C!A  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); g:[yA{Eh  
  } T3/Gl 6f  
 } 0 t0m?rVW  
 SetIcon(m_hIcon, TRUE); // Set big icon l\t<_p/I)^  
 SetIcon(m_hIcon, FALSE); // Set small icon dQPW9~g8Hg  
 m_Key.SetCurSel(0); R?J=5tO  
 RegisterHotkey(); :cE~\B S&  
 CMenu* pMenu=GetSystemMenu(FALSE); `j(-y`fo  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); uVLKR PY  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); O`'r:&#W  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 1y6{3AZm<  
 return TRUE; // return TRUE unless you set the focus to a control 5H/D~hr&  
} 3/RNStd<L!  
),U>AiF]  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ; Ne|H$N  
{ Y2P%0  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) l#!6 tw+e?  
 { +Am\jsq  
  CAboutDlg dlgAbout; KOVR=``"/  
  dlgAbout.DoModal(); R}0!F 2  
 } mI3 \n  
 else f VpE&F  
 { q,2 +\i  
  CDialog::OnSysCommand(nID, lParam); eGlPi|  
 } dW"=/UW  
} 3W"l}.&ZJ"  
6e At`L[K.  
void CCaptureDlg::OnPaint() :eW`El  
{ .#}`r`/  
 if (IsIconic()) 94 GF8P  
 { LVxR *O  
  CPaintDC dc(this); // device context for painting 629 #t`W\  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); K|sx"u|?  
  // Center icon in client rectangle "1>48Z-UC  
  int cxIcon = GetSystemMetrics(SM_CXICON); 4xzoA'Mb@  
  int cyIcon = GetSystemMetrics(SM_CYICON); &265 B_'D  
  CRect rect; 61&A`  
  GetClientRect(&rect); 4Y4QR[>IU3  
  int x = (rect.Width() - cxIcon + 1) / 2; n_MY69W  
  int y = (rect.Height() - cyIcon + 1) / 2; 9*j$U$:'  
  // Draw the icon [BKX$A:Y  
  dc.DrawIcon(x, y, m_hIcon);  j#YPo  
 } (2p<I)t  
 else cP`[/5R  
 { H+F>#  
  CDialog::OnPaint(); K}9c$C4  
 } \"?5CHz*  
} Z-rHYfa4  
TAKv E=a;  
HCURSOR CCaptureDlg::OnQueryDragIcon() Eh/Z4pzT  
{ eaCh;IpIf  
 return (HCURSOR) m_hIcon; !5=S 2<UX  
} }J|Pd3Q Sf  
I&|J +B?#  
void CCaptureDlg::OnCancel() y:ad%,. C  
{ ~SR9*<  
 if(bTray) |Y]4PT#EE  
  DeleteIcon(); oVja$;>  
  CDialog::OnCancel(); y8CH=U[  
} .%T.sQ  
pF}WMt  
void CCaptureDlg::OnAbout() zJX _EO  
{ db0]D\  
 CAboutDlg dlg; ])H[>.?K  
 dlg.DoModal(); rM{V>s:N  
} qC ku q  
acdF5ch@  
void CCaptureDlg::OnBrowse() ="__*J#nze  
{ 6z ,nt  
 CString str; >Eqr/~Q  
 BROWSEINFO bi; N Obw/9JO  
 char name[MAX_PATH]; DRuG5|{I:  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); YK6zN>M}E  
 bi.hwndOwner=GetSafeHwnd(); XX[CTh?O%  
 bi.pszDisplayName=name; fH*1.0f]6  
 bi.lpszTitle="Select folder"; s\3OqJo%)  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; +/4wioGm  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); :*dfP/GO  
 if(idl==NULL) &_ W~d0  
  return; P&}J (;Lbl  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH));  mB<*we  
 str.ReleaseBuffer(); +jN%w{^=  
 m_Path=str; $hq'9}ASOL  
 if(str.GetAt(str.GetLength()-1)!='\\') SVJt= M  
  m_Path+="\\"; RSK5 }2  
 UpdateData(FALSE); $Z[W}7{pt#  
} )H| cri~D  
c-q=Ct  
void CCaptureDlg::SaveBmp() lmpBf{~ S  
{ 9HBRWh6  
 CDC dc; Bb zmq  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); =@y ?Np^A  
 CBitmap bm; ]o3K  
 int Width=GetSystemMetrics(SM_CXSCREEN); EaUO>S  
 int Height=GetSystemMetrics(SM_CYSCREEN); #d;/Me  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 4"~l^yK  
 CDC tdc; Z|6,*XEc   
 tdc.CreateCompatibleDC(&dc); : oO ?A  
 CBitmap*pOld=tdc.SelectObject(&bm); "1|\V.>>;  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); O"V;otlC  
 tdc.SelectObject(pOld); nC(<eL  
 BITMAP btm; =]m,7v Rq  
 bm.GetBitmap(&btm); EUjA-L(  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; f S-PM3  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); iM(Q-%HP_  
 BITMAPINFOHEADER bih; r%412 #  
 bih.biBitCount=btm.bmBitsPixel; t5;)<N`  
 bih.biClrImportant=0; Vh'H =J  
 bih.biClrUsed=0; SBh"^q  
 bih.biCompression=0; U2vM|7 ]VP  
 bih.biHeight=btm.bmHeight; , Aw Z%  
 bih.biPlanes=1; RAB'%CY4  
 bih.biSize=sizeof(BITMAPINFOHEADER); p4^&G/'  
 bih.biSizeImage=size; "xV0$%  
 bih.biWidth=btm.bmWidth; Y4Y~e p  
 bih.biXPelsPerMeter=0; Nn='9s9F?}  
 bih.biYPelsPerMeter=0; S?<hs,  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); fOJTy0jX8  
 static int filecount=0; ^\C Fke=  
 CString name; gi #dSd1\&  
 name.Format("pict%04d.bmp",filecount++); I#PhzGC@  
 name=m_Path+name; $L"h|>b\o  
 BITMAPFILEHEADER bfh; (C.<H6]=  
 bfh.bfReserved1=bfh.bfReserved2=0; "X,*VQl:  
 bfh.bfType=((WORD)('M'<< 8)|'B'); /_qW?LKG/  
 bfh.bfSize=54+size; $(+#$F<eo+  
 bfh.bfOffBits=54; V[2}  
 CFile bf; 4=qZ Z>[t  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 4~ i?xo=;v  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 6<mlx'  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); E4, J"T|@  
  bf.WriteHuge(lpData,size); M2pFXU?]  
  bf.Close(); Nk;ywC"e;  
  nCount++; C2C 1 @=w  
 } 9 :,ZG4s  
 GlobalFreePtr(lpData); 3*=_vl3  
 if(nCount==1) /I &wh  
  m_Number.Format("%d picture captured.",nCount); DPr~DO`b  
 else RmRPR<vGW  
  m_Number.Format("%d pictures captured.",nCount); ve^gzE$<I  
  UpdateData(FALSE); yS1i$[JV  
} YF)k0bu&;  
t W}"PKv  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -CLBf'a  
{ c<,R,D R  
 if(pMsg -> message == WM_KEYDOWN) aUk]wiwIR9  
 { 2#oU2si   
  if(pMsg -> wParam == VK_ESCAPE) _F},Wp:Oh  
   return TRUE; .t7ME{  
  if(pMsg -> wParam == VK_RETURN) s w{e |  
   return TRUE; o[)*Y`xq<w  
 } 3?e~J"WXC5  
 return CDialog::PreTranslateMessage(pMsg); c8LMvL  
} Vw]!Kb7tA  
eY[kUMo  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) j]C}S*`"  
{ 'P)c'uqd#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ X& mD/1  
  SaveBmp(); NG_7jZzXA9  
  return FALSE; jss.j~8  
} xVk5%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Ey=ymf.}  
 CMenu pop; qe 'RvBz  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 3~1Gts  
 CMenu*pMenu=pop.GetSubMenu(0); 0.)q5B`  
 pMenu->SetDefaultItem(ID_EXITICON); )H(i)$I  
 CPoint pt; iDWM-Ytx  
 GetCursorPos(&pt); CaC \\5wl  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); $,zW0</P*l  
 if(id==ID_EXITICON) V1haAP[#  
  DeleteIcon(); ^?NLA&v<  
 else if(id==ID_EXIT) Zc'^iDAY  
  OnCancel(); ,b4oV  
 return FALSE; uS5G(}[  
} 25 cJA4  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); (hEg&@  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _y&XFdp  
 AddIcon(); \q\"=  
 return res; +)LCYDRV7  
} 0 9qfnQG  
Y"L|D,ex  
void CCaptureDlg::AddIcon() QBh*x/J  
{ @C%6Wo4l3  
 NOTIFYICONDATA data; jZD)c_'U  
 data.cbSize=sizeof(NOTIFYICONDATA); /DjsnU~3  
 CString tip;  aWPf3Q  
 tip.LoadString(IDS_ICONTIP); b gxk:$E  
 data.hIcon=GetIcon(0); `<{LW>Lb  
 data.hWnd=GetSafeHwnd(); /24}>oAH  
 strcpy(data.szTip,tip); >#)%/Ti}DU  
 data.uCallbackMessage=IDM_SHELL; EJ(36h  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; T%Bz>K  
 data.uID=98; .yDGwLry  
 Shell_NotifyIcon(NIM_ADD,&data); /b\c<'3NY  
 ShowWindow(SW_HIDE); `~z[Hj=2  
 bTray=TRUE; 3"juj '  
} NeJ->x,  
W,"Re,`H  
void CCaptureDlg::DeleteIcon() u=tp80_  
{ aIDv~#l  
 NOTIFYICONDATA data; sF>O=F-7  
 data.cbSize=sizeof(NOTIFYICONDATA); 4jSYR#Hqp`  
 data.hWnd=GetSafeHwnd(); W*%(J$E  
 data.uID=98; ]&N>F8.L+  
 Shell_NotifyIcon(NIM_DELETE,&data); TB-dV'w  
 ShowWindow(SW_SHOW); XhA tf @n  
 SetForegroundWindow(); I{h KN V  
 ShowWindow(SW_SHOWNORMAL); 0' oXA'L-J  
 bTray=FALSE; F]t=5 -O<  
} |]9L#  
zk"8mTg  
void CCaptureDlg::OnChange()  i CLH  
{ TW|- 0  
 RegisterHotkey(); vZW[y5   
} 8+J>jZ  
r6kJV4I=re  
BOOL CCaptureDlg::RegisterHotkey() DJ*mWi.  
{ >JAWcT)d  
 UpdateData(); &_u.q/~   
 UCHAR mask=0; a#k7 aOT0  
 UCHAR key=0; c& I  
 if(m_bControl) e`:^7$  
  mask|=4; ,@/O\fit)  
 if(m_bAlt) \m%c"'[  
  mask|=2; P@f#DX )  
 if(m_bShift) "}wO<O6[  
  mask|=1; vK[%c A"  
  key=Key_Table[m_Key.GetCurSel()]; Ctn 4q'Q  
 if(bRegistered){ z:$ibk4#h  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ) P>/g*  
  bRegistered=FALSE; }Z{FPW.QK  
 } !l=)$RJKdD  
 cMask=mask; YCQ $X  
 cKey=key; (^(l=EN-<  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >:4`y"0  
 return bRegistered; jCXBp>9$M  
} &q@brX<,=  
.6T0d 4,1  
  四、小结 Q4hY\\Hi  
R :(-"GW'  
  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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