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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: HNA/LJl[VU  
  ,$,6%"'"  
  一、实现方法 S-"&#OfWg<  
+_8*;k@F'  
  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@3VN~  
=<.8  
#pragma data_seg("shareddata") D]9I-|  
HHOOK hHook =NULL; //钩子句柄 -Fodqq@,  
UINT nHookCount =0; //挂接的程序数目 1{oq8LB  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 F*F U[ 5  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 /5@V $c8  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey :QnN7&j|(w  
static int KeyCount =0; ?~e 8:/@  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 _|x b)_  
#pragma data_seg() 9=D\xBd|w  
pJ6Z/3]  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 a;Q6S  
-<gGNj.x-  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: |0?h6  
Y~T;{&wi  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR K.cMuh  
cKey,UCHAR cMask) H|4O`I;~(  
{ ]q0mo1-EZ!  
 BOOL bAdded=FALSE; 'H<0:bQ=I  
 for(int index=0;index<MAX_KEY;index++){ ZZf-c5 g  
  if(hCallWnd[index]==0){ :7t~p&J  
   hCallWnd[index]=hWnd; ?|8H|LBIr  
   HotKey[index]=cKey; M`$s dZ"  
   HotKeyMask[index]=cMask; }fW@8ji\  
   bAdded=TRUE; P1b5=/}:V  
   KeyCount++; vMsb@@O\\  
   break; \gRX:i#n  
  } x8Rmap@L.  
 } 3 T$gT  
 return bAdded; i0 ax`37  
} p4;A[2Ot`:  
//删除热键 )W!8,e+%  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8[SiIuIV  
{ [kx_Izi/T  
 BOOL bRemoved=FALSE; 2T &<jt  
 for(int index=0;index<MAX_KEY;index++){ `}ak;^Me  
  if(hCallWnd[index]==hWnd){ $srb!&~_>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ LB_y lfg  
    hCallWnd[index]=NULL; k&4@$;Ap  
    HotKey[index]=0; 3jIi$X06  
    HotKeyMask[index]=0; =dD<[Iz6  
    bRemoved=TRUE; ?b0VB  
    KeyCount--; MR/jM@8  
    break; (MiEXU~v  
   } j?ihUNY!+  
  } -b "7WBl  
 } yjODa90!G  
 return bRemoved; 7@u0;5p|  
} =(ts~^  
OPR+K ?  
C`c;I7  
  DLL中的钩子函数如下: w#w lZ1f  
[?mDTD8zU  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Y,OSQBgk  
{ P g.PD,&U  
 BOOL bProcessed=FALSE; 6LRI~*F=3  
 if(HC_ACTION==nCode) ~d :Z |8  
 { `Q V}je  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 h_ef@ZwSw  
   switch(wParam) TJ3CXyRq  
   {  o0b}:`  
    case VK_MENU: /238pg~Cw5  
     MaskBits&=~ALTBIT; RKsr}-1 8  
     break; $:kG>R@\t  
    case VK_CONTROL: \TS t  
     MaskBits&=~CTRLBIT; eOa:%{Kj  
     break; :B?XNo  
    case VK_SHIFT: oR>o/$z$)g  
     MaskBits&=~SHIFTBIT; ;/#E!Ja/ u  
     break; nj99!"_   
    default: //judge the key and send message @O#4duM4Qz  
     break; CZ*c["x2  
   } 5K13    
   for(int index=0;index<MAX_KEY;index++){ h% BA,C  
    if(hCallWnd[index]==NULL) ;hi+.ng_  
     continue; #/zPAcV:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) hc}d S$=C  
    { AK\X{>$a!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); jZu">Eh,  
     bProcessed=TRUE; YHN@?}T()  
    } a<l(zJptG  
   } qt5CoxeJ  
  } O7|0t\)  
  else if((lParam&0xc000ffff)==1){ //有键按下 Kl<qp7o0  
   switch(wParam) :9N~wd  
   { {7 &(2Z]z  
    case VK_MENU: deSrs:.  
     MaskBits|=ALTBIT; m`!C|?hu  
     break; bj4cW\b(  
    case VK_CONTROL: _y&m4Vuu  
     MaskBits|=CTRLBIT; !4cR&@[  
     break; E\Hhi.-  
    case VK_SHIFT: y#8| @?  
     MaskBits|=SHIFTBIT; ^OKCvdS  
     break; Szrr`.']  
    default: //judge the key and send message 8MgoAX,p  
     break; ~TC z1UWV  
   } U2z1HIs  
   for(int index=0;index<MAX_KEY;index++){ !0:uM)_k  
    if(hCallWnd[index]==NULL) tL(B gku9  
     continue; ,:UoE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z-;<R$  
    { <@xp. Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;}{xpJ/  
     bProcessed=TRUE; vR<Y1<j  
    } I`kaAOe  
   } Bsi HVr  
  } Xk%92Pto  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 g#qt<d}j  
   for(int index=0;index<MAX_KEY;index++){ @ROMHMd}  
    if(hCallWnd[index]==NULL) @0A7d $J(  
     continue; @mBZu!,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) N*w/\|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); kFmd):U!R  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 [_6_A O(Z  
   } UR6.zE4=_  
  } @'`!2[2'?  
 } S'qEBz  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )p'ZSXb  
} TB 9{e!4  
,-^Grmr4M  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: o %sBU  
q y73  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 57IAH$n8o  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^c3~CD5H 3  
6KPM4#61o  
  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: ;$Q `JN=  
bI.LE/yk  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) K5gh7  
{ ^T`)ltI]V  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) X[b=25Ct  
 { 1 zIFQ@  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 VAf"B5 R  
  SaveBmp(); ?}"$[6.  
  return FALSE; YL \d2  
 } W]MKc&R  
 …… //其它处理及默认处理  f.acH]p  
} KB49~7XjQ@  
B}_*0D  
uu L"o  
  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。 c'nEbelE  
/tI8JXcUK  
  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。 O@r%G0Jge  
UN#XP$utY  
  二、编程步骤 ~pA_E!3W  
 " Mzb  
  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"; c}GmS@  
k4jZu?\C]  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Wr H7tz  
 4b]/2H  
  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; \U $'3M  
p2 u*{k{  
  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; 9}4P%>_  
! iuDmL  
  5、 添加代码,编译运行程序。 Qa@b-v'by  
Iko1%GJ1Z  
三、程序代码 U_ n1QU  
=W'a6)WE  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL %PozxF:  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) N>##} i  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 9}^nozR,I  
#if _MSC_VER > 1000 y}5V3)P  
#pragma once |}s)Wo  
#endif // _MSC_VER > 1000 eMyh&@7(F  
#ifndef __AFXWIN_H__ .lnyn|MVb  
#error include 'stdafx.h' before including this file for PCH S]&f+g}&w  
#endif sy`@q<h(  
#include "resource.h" // main symbols $sK8l=#  
class CHookApp : public CWinApp 5v6 x  
{ HwTb753  
 public: 5/Viz`hsz  
  CHookApp(); g bDre~|  
  // Overrides 3lzjY.]Pgv  
  // ClassWizard generated virtual function overrides CY~]lQ  
  //{{AFX_VIRTUAL(CHookApp) xl [3*K   
 public: C3q}Dh+]  
  virtual BOOL InitInstance(); ;hb;%<xqT  
  virtual int ExitInstance(); .4E5{F{~  
  //}}AFX_VIRTUAL ^R- -&{I  
  //{{AFX_MSG(CHookApp) 6'CZfs\  
  // NOTE - the ClassWizard will add and remove member functions here. "SC}C  
  // DO NOT EDIT what you see in these blocks of generated code ! J%ng8v5ex  
  //}}AFX_MSG {a aI<u  
  DECLARE_MESSAGE_MAP() Vb^P{F  
}; 2noKy}q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); -7E)u  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zOJ4I^^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); KMC]<  
BOOL InitHotkey(); rTTde^^_  
BOOL UnInit(); iAD'MB  
#endif 6.%M:j0 0E  
Xg+Eeg#  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Fy:CG6@X  
#include "stdafx.h" @@~OA>^  
#include "hook.h" j}9][Fm1*  
#include <windowsx.h> {l$DNnS  
#ifdef _DEBUG /)RyRS8c  
#define new DEBUG_NEW ILi{5L  
#undef THIS_FILE ,z<J`n  
static char THIS_FILE[] = __FILE__; E4;vC ?K{  
#endif 8~*<s5H  
#define MAX_KEY 100 x!5b" "  
#define CTRLBIT 0x04 ; kPx@C   
#define ALTBIT 0x02 SOE 5`  
#define SHIFTBIT 0x01 5cj]Y)I-~  
#pragma data_seg("shareddata") B(tLV9B3Q  
HHOOK hHook =NULL; C \"nlNKw  
UINT nHookCount =0; )F _vWbg  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey WUOoK$I~K  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT A^lJlr:_`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey .*FBr7rE\  
static int KeyCount =0; 6ub-NtVu  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift  NGQBOV  
#pragma data_seg() A|jmp~@K)+  
HINSTANCE hins; XC 44]o4jx  
void VerifyWindow(); '-9B`O,&  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) #snwRW>=[  
//{{AFX_MSG_MAP(CHookApp) t Qo) *z  
// NOTE - the ClassWizard will add and remove mapping macros here. = iJfz  
// DO NOT EDIT what you see in these blocks of generated code! xvo""R/g8  
//}}AFX_MSG_MAP pJ8;7u  
END_MESSAGE_MAP() U\OfB'Dn  
TCShS}q;%  
CHookApp::CHookApp() %L;z~C  
{ ',Y`XP"Q  
 // TODO: add construction code here, l Tpn/  
 // Place all significant initialization in InitInstance O3ij/8f  
} ivTx6-]  
rl:6N*kK  
CHookApp theApp; yFt$L'#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 117`=9F  
{ LPuc&8lGWf  
 BOOL bProcessed=FALSE; [l~Gwaul>  
 if(HC_ACTION==nCode) (]c M ;  
 { _#f+@)vR  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8 ckcTNPu  
   switch(wParam) W=QT-4  
   { S  ^5EG;[  
    case VK_MENU: Ug}dw a  
     MaskBits&=~ALTBIT; Sr$&]R]^  
     break; -@*[   
    case VK_CONTROL: >.sdLA Si  
     MaskBits&=~CTRLBIT; *=yUs'brB  
     break; K;uOtbdOK  
    case VK_SHIFT: R0 yPmh,{  
     MaskBits&=~SHIFTBIT; cXcrb4IKD  
     break; pTzwyj!SD  
    default: //judge the key and send message +=_^4  
     break; W^(:\IvV  
   } zY11.!2  
   for(int index=0;index<MAX_KEY;index++){ whH_<@!  
    if(hCallWnd[index]==NULL) W#|30RU.G  
     continue; $*k(h|XfwW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -_%8Q#"  
    { l g0 'qH8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); adCTo  
     bProcessed=TRUE;  !' }  
    } /5**2Kgv1  
   } &XvSAw+D@  
  } f0^;*Y  
  else if((lParam&0xc000ffff)==1){ //Key down NE~R&ym9  
   switch(wParam) ?cyBF*o  
   { 4z;@1nN_8a  
    case VK_MENU: kzkrvC+u  
     MaskBits|=ALTBIT; OuZPgN  
     break; bU3P; a(  
    case VK_CONTROL: ;nSOe AF)Q  
     MaskBits|=CTRLBIT; ^i"~6QYE  
     break; hRU5CH/!  
    case VK_SHIFT: 5%6{ ePh{  
     MaskBits|=SHIFTBIT; ~10>mg  
     break; -22]|$f  
    default: //judge the key and send message 05ZF>`g*  
     break; L5RBe  
   } \:5M0  
   for(int index=0;index<MAX_KEY;index++) 1"fbQ^4`  
   { tj1M1s|a  
    if(hCallWnd[index]==NULL) z#u<]] 5  
     continue; [B1h0IR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (Wu J9  
    { K9=f`JI9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #\T5r*W  
     bProcessed=TRUE; x@Ze%$'  
    } }1BpIqee  
   } &57s//PrX  
  } 7H$wpn Zln  
  if(!bProcessed){ v2KK%Qy  
   for(int index=0;index<MAX_KEY;index++){ grZ?F~P8  
    if(hCallWnd[index]==NULL) EHlkt,h*  
     continue; =C4!h'hz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /DxeG'O  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \2OjIEQQ  
   } ]1dnp]r  
  } *R_mvJlT  
 } Z~Vups#+f  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5-B %08T  
} @w @SOzS)  
)Q5ja}-{V  
BOOL InitHotkey() w(cl,W/w  
{ zcCGR Ee=  
 if(hHook!=NULL){ EF5:$#  
  nHookCount++; @q++eGm\Q  
  return TRUE; PlC8&$   
 } bo_Tp~ j  
 else SadffAvSA{  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); jr3FDd]  
  if(hHook!=NULL) 0UN65JBuD  
   nHookCount++; )Q)H!yin  
  return (hHook!=NULL); Xd@_:ds  
} 8=DZ;]XD.  
BOOL UnInit() 0~=>:^H'`q  
{ CZ|h` ";P2  
 if(nHookCount>1){ 2&KM&NX~  
  nHookCount--; cIB[D.  
  return TRUE; p`T,VU&.  
 } hNUkaP  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 4) z*Vux  
 if(unhooked==TRUE){ `\M}~  
  nHookCount=0; 5 K[MKfT  
  hHook=NULL; jrLV\(p  
 } Q)%a2s;  
 return unhooked; vI5'npM  
} 2/f!{lz](  
V}po  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;Vlt4,s)  
{ b X'.hHR  
 BOOL bAdded=FALSE; AEO7I f@  
 for(int index=0;index<MAX_KEY;index++){ i564<1`x  
  if(hCallWnd[index]==0){ >O/1Lpl.3  
   hCallWnd[index]=hWnd; bTJ l  
   HotKey[index]=cKey; {-.ZFUZmT  
   HotKeyMask[index]=cMask; f;cY&GC  
   bAdded=TRUE; @*"H{xo.U  
   KeyCount++; Vohd d_x  
   break; c^ W \0  
  } [;,Xp/  
 } Qm5Sf=E7Q  
 return bAdded; QNxY`  
} |\6Ff/O  
 mm9xO%  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (GB*+@  
{ y*7<tj.`b0  
 BOOL bRemoved=FALSE; "C'T>^qw*  
 for(int index=0;index<MAX_KEY;index++){ [z> Ya-uz7  
  if(hCallWnd[index]==hWnd){ &N|`Q (QXS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !r %u@[(  
    hCallWnd[index]=NULL; 0o_wy1O1,  
    HotKey[index]=0; :~4 M9  
    HotKeyMask[index]=0; -E,p[Sp  
    bRemoved=TRUE; j@C*kj;-  
    KeyCount--; &8M^E/#.^;  
    break; [a!*m<  
   } < +X,oxg  
  } `Yw:<w\4C  
 } /^Ng7Mi!  
 return bRemoved; 1`v$R0 `!  
} U2HAIV8  
m'YYkq(5%Z  
void VerifyWindow() i2 7KuPjC  
{ LR Dj!{k{  
 for(int i=0;i<MAX_KEY;i++){ hB??~>i3  
  if(hCallWnd!=NULL){ v/z~ j  
   if(!IsWindow(hCallWnd)){ EU4j'1!&g<  
    hCallWnd=NULL; Z<W`5sop^  
    HotKey=0; (M nK \^Y  
    HotKeyMask=0; c(r8 F[4w  
    KeyCount--; HsRQiai*  
   } vuO~^N]G  
  } 1YJ@9*l  
 } GjeRp|_Qd<  
} &hSF  
<0!)}O  
BOOL CHookApp::InitInstance() _ m<@ou7  
{ mt*/%>@7R  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); l$DQkbOj  
 hins=AfxGetInstanceHandle(); YT\.${N  
 InitHotkey(); CN!~(1v  
 return CWinApp::InitInstance(); ^zVW 3 Y q  
} Q/^a(   
IfzZ\x .  
int CHookApp::ExitInstance() SeIL   
{ Zg/ ],/`  
 VerifyWindow(); xF])NZy|  
 UnInit(); $0P7^4)w:  
 return CWinApp::ExitInstance(); thrv_^A  
} ;noZmPa  
X-}]?OOs  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file vCsJnKqK  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) se`^g ,]P  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ j5V{,lf  
#if _MSC_VER > 1000 F%`O$uXA  
#pragma once z-G*:DfgH  
#endif // _MSC_VER > 1000 = sh3&8  
NkY7Hg0  
class CCaptureDlg : public CDialog 3"p'WZ>  
{ N`rz>6,k1  
 // Construction qz&?zzz;  
 public: h}yfL@  
  BOOL bTray; ~Zo;LSI  
  BOOL bRegistered; h$$2(!G4  
  BOOL RegisterHotkey(); E4qQ  
  UCHAR cKey; [VY265)g  
  UCHAR cMask; yLEA bd%+  
  void DeleteIcon(); )UN_,'H/V  
  void AddIcon(); $3yn-'o'A  
  UINT nCount; O2N~&<^  
  void SaveBmp(); {I]>!V0j!  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ]Ia}H+&  
  // Dialog Data RLR\*dL1  
  //{{AFX_DATA(CCaptureDlg) =} flmUv~  
  enum { IDD = IDD_CAPTURE_DIALOG }; BT* {&'\/  
  CComboBox m_Key; WWN2  
  BOOL m_bControl; ^C70b)68  
  BOOL m_bAlt; \.Z /  
  BOOL m_bShift; ^17i98w  
  CString m_Path; NQIbav^5  
  CString m_Number; ]!v\whZ>  
  //}}AFX_DATA oN&U@N/>aU  
  // ClassWizard generated virtual function overrides |)+45e  
  //{{AFX_VIRTUAL(CCaptureDlg) -I.BQ  
 public: !MEA@^$#  
  virtual BOOL PreTranslateMessage(MSG* pMsg); - sL4tMP  
 protected: M=#g_*d  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _E8doV  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); iG+=whvL  
  //}}AFX_VIRTUAL uL |O<  
  // Implementation FC#t}4as  
 protected: ^EcwY- Qr  
  HICON m_hIcon; *  \%b1  
  // Generated message map functions xew s~74L  
  //{{AFX_MSG(CCaptureDlg) 8RjFp2) W  
  virtual BOOL OnInitDialog(); ]^I[SG,  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Aga{EKd  
  afx_msg void OnPaint(); h]DzX8r}  
  afx_msg HCURSOR OnQueryDragIcon(); DT3koci(  
  virtual void OnCancel(); @.L/HXu-P  
  afx_msg void OnAbout(); PxA OKUpI  
  afx_msg void OnBrowse();  ^w_\D?  
  afx_msg void OnChange(); EkoT U#w5  
 //}}AFX_MSG avW33owb@  
 DECLARE_MESSAGE_MAP() iw{^nSD  
}; h)Ol1[y`  
#endif i&j]FX6q  
gv,1 CK  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 1} ~`g ED  
#include "stdafx.h" 9ePom'1f1  
#include "Capture.h" r?/!VO-*N  
#include "CaptureDlg.h"  %e(DPX  
#include <windowsx.h> 0<+eN8od.  
#pragma comment(lib,"hook.lib") +v< \l=  
#ifdef _DEBUG 1p8hn!V  
#define new DEBUG_NEW a}X. ewg  
#undef THIS_FILE ._q<~_~R  
static char THIS_FILE[] = __FILE__; *!ecb1U5  
#endif pA6A*~QE  
#define IDM_SHELL WM_USER+1 #3?}MC  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *Tr9pq%m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E] rBq_S  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; /7x1Z*Hg  
class CAboutDlg : public CDialog e-#V s{?|r  
{ 'V\V=yc1  
 public: CZf38$6X  
  CAboutDlg(); QOY{j  
  // Dialog Data nd&i9l  
  //{{AFX_DATA(CAboutDlg) 8RQv  
  enum { IDD = IDD_ABOUTBOX }; ;9LOeH?  
  //}}AFX_DATA :*s@L2D6  
  // ClassWizard generated virtual function overrides je%D&ci$  
  //{{AFX_VIRTUAL(CAboutDlg) ]n3!%0]\  
 protected: ja6V*CWb  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +!ZfJZls  
  //}}AFX_VIRTUAL [&kz4_  
  // Implementation rQosI:$  
 protected: BN~ndWRK  
  //{{AFX_MSG(CAboutDlg) mF4y0r0  
  //}}AFX_MSG s+(@UUl  
  DECLARE_MESSAGE_MAP() u60RuP&  
}; ("{"8   
v7\rW{~Jd&  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #\_ 8y`{x  
{ RC?vU  
 //{{AFX_DATA_INIT(CAboutDlg) pw`'q(ad  
 //}}AFX_DATA_INIT q@tym5  
} cL][sI  
".2d{B  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) *f_A :`:  
{ 7iyx_gyo  
 CDialog::DoDataExchange(pDX); %k~ezn  
 //{{AFX_DATA_MAP(CAboutDlg) Dt{WRe\#  
 //}}AFX_DATA_MAP (L yKo  
} $x,EPRNs  
mxpj<^n}  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) q;UGiB^(A  
 //{{AFX_MSG_MAP(CAboutDlg) *+nw%gZG  
 // No message handlers g> ~+M  
 //}}AFX_MSG_MAP $/|vbe,  
END_MESSAGE_MAP() g>k?03;  
]"~ x  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) t=9f:,I$  
: CDialog(CCaptureDlg::IDD, pParent) jsx&h Y%(  
{ crN*eFeW  
 //{{AFX_DATA_INIT(CCaptureDlg) klH?!r&  
  m_bControl = FALSE; K?r  
  m_bAlt = FALSE; }r@yBUW  
  m_bShift = FALSE; r-yUWIr S  
  m_Path = _T("c:\\"); `'&mO9,<-  
  m_Number = _T("0 picture captured."); J_;*@mW  
  nCount=0; MTKNIv|  
  bRegistered=FALSE; (\!?>T[En  
  bTray=FALSE; u0A$}r$L  
 //}}AFX_DATA_INIT e<*qaUI  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >oO]S]W  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Z4rk$K'=1w  
} dfKGO$}V  
Ow.DBL)x'>  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) r/HTkXs I  
{ O6vxp?:^  
 CDialog::DoDataExchange(pDX); /|<S D.:  
 //{{AFX_DATA_MAP(CCaptureDlg) V)l:fUm2  
  DDX_Control(pDX, IDC_KEY, m_Key); `*BV@  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 6q>}M  
  DDX_Check(pDX, IDC_ALT, m_bAlt); SOn)'!g  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Ie|5,qw E  
  DDX_Text(pDX, IDC_PATH, m_Path); d4*SfzB  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ' QMcQvU  
 //}}AFX_DATA_MAP u&^KrOM@#  
} '&dT   
"j8)l4}  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) O"Nr$bS(Y  
//{{AFX_MSG_MAP(CCaptureDlg) RRV%g!  
 ON_WM_SYSCOMMAND() k!}(a0h  
 ON_WM_PAINT() 8A.7q  
 ON_WM_QUERYDRAGICON() EmR82^_:  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) d~QM@<SV  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) w;j<$<4=7  
 ON_BN_CLICKED(ID_CHANGE, OnChange) r-TrA$k  
//}}AFX_MSG_MAP =&,T@5&-=  
END_MESSAGE_MAP() 4d cm)Xr  
E}v8Q~A(  
BOOL CCaptureDlg::OnInitDialog() +ima$a0Zyt  
{ *YL86R+U  
 CDialog::OnInitDialog(); '4<o&b^yQ  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); %ut 8/T  
 ASSERT(IDM_ABOUTBOX < 0xF000); J-<_e??  
 CMenu* pSysMenu = GetSystemMenu(FALSE); /I!62?)-*  
 if (pSysMenu != NULL) 6 /5,n0  
 {  BgQ/$,  
  CString strAboutMenu; Wbei{3~$Y"  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 8'jt59/f  
  if (!strAboutMenu.IsEmpty()) ENIg_s4  
  { q4&! mDU  
   pSysMenu->AppendMenu(MF_SEPARATOR); A[ncwJ  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); jC4>%!{m  
  } vdC0tax  
 } [l3\0e6-/  
 SetIcon(m_hIcon, TRUE); // Set big icon F8"J<VJ7  
 SetIcon(m_hIcon, FALSE); // Set small icon iw3\`,5   
 m_Key.SetCurSel(0); =CJ`0yDQ>  
 RegisterHotkey(); 7C 0xKF  
 CMenu* pMenu=GetSystemMenu(FALSE); !%ju.Xs8  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); E;{RNf|  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); m*A b<$y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); A|S)cr8z  
 return TRUE; // return TRUE unless you set the focus to a control 6p*X8j3pW  
} rDhQ3iCqo  
?]$<Ufr  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #dL,d6a  
{ rKUtTj  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 'jfE?ngt  
 { d"06 gp  
  CAboutDlg dlgAbout; \<*F#3U1  
  dlgAbout.DoModal(); Z4Dx:m-  
 } |-b\N6 }  
 else n:OXv}pv  
 { k6&~)7 -f  
  CDialog::OnSysCommand(nID, lParam); kSzap+nB?  
 } %UrNPk  
} "Zh,;)hS  
WoN},oT[i  
void CCaptureDlg::OnPaint() Q=Mv"~2>B  
{ `G1"&q,i  
 if (IsIconic()) 8wvHg_U6W  
 { {)lZfj}l  
  CPaintDC dc(this); // device context for painting M,@M5o2u  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); m+;U,[%[*E  
  // Center icon in client rectangle n=V|NrU  
  int cxIcon = GetSystemMetrics(SM_CXICON); 7PMz6  
  int cyIcon = GetSystemMetrics(SM_CYICON); T` h%=u|D  
  CRect rect; V 97ORI  
  GetClientRect(&rect); Mf#@8"l  
  int x = (rect.Width() - cxIcon + 1) / 2; [*p;+&+/ZM  
  int y = (rect.Height() - cyIcon + 1) / 2; 2A; i  
  // Draw the icon jI7 x<=  
  dc.DrawIcon(x, y, m_hIcon); 'g)f5n a[  
 } :?\29j#*V  
 else SyVXXk 0  
 { 3 0[Xkz  
  CDialog::OnPaint(); XYuX+&XW/  
 } *6` ^8Y\  
} jmwN1Se>  
&uRT/+18W3  
HCURSOR CCaptureDlg::OnQueryDragIcon() A;Y~Hu4KPZ  
{ 0*b8?e  
 return (HCURSOR) m_hIcon; :38h)9>RK  
} 5?SE?VC=t  
2|lR@L sr  
void CCaptureDlg::OnCancel() zPp22  
{ -Yse^(^"s  
 if(bTray) mc%. 8i  
  DeleteIcon(); nUpj+F#  
  CDialog::OnCancel(); Q4-d|  
} 7FcZxu\  
]pBEoktp  
void CCaptureDlg::OnAbout() DSqA}r  
{ NMK$$0U  
 CAboutDlg dlg; |.$B,cEd  
 dlg.DoModal(); @[9  
} 'RKpMdoz  
z@3gNY&7.8  
void CCaptureDlg::OnBrowse() -d'F KOD  
{ M?sax+'  
 CString str; :?zq!  
 BROWSEINFO bi; G{fPQ=  
 char name[MAX_PATH]; ]vz6DJs  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 8%m\J:e R  
 bi.hwndOwner=GetSafeHwnd(); .:}<4;Qz94  
 bi.pszDisplayName=name; Yq00<kIDJ  
 bi.lpszTitle="Select folder"; S1^/W-yoc~  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; }Y.YJXum  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); T90O.]S  
 if(idl==NULL) *W\3cS  
  return; , 4xNW:!j  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ,Ohhl`q(  
 str.ReleaseBuffer(); `)y ;7%-  
 m_Path=str; VVch%  
 if(str.GetAt(str.GetLength()-1)!='\\') BedL `[ ,  
  m_Path+="\\"; WLXt@dK*u  
 UpdateData(FALSE); Q2ne]MI  
} k{;?>=FH!  
mz.,j(Ks-  
void CCaptureDlg::SaveBmp() m<3. X"-  
{ P_0X+Tz  
 CDC dc; Y QC.jnb2  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 9ns( F:  
 CBitmap bm; wsB-( 0-  
 int Width=GetSystemMetrics(SM_CXSCREEN); {l$)X  
 int Height=GetSystemMetrics(SM_CYSCREEN); A4@z+ebb l  
 bm.CreateCompatibleBitmap(&dc,Width,Height); zqdkt `  
 CDC tdc; drjNK!XL@  
 tdc.CreateCompatibleDC(&dc); ^2Cqy%x-  
 CBitmap*pOld=tdc.SelectObject(&bm); 9D\E0YG X/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 98R/ ^\  
 tdc.SelectObject(pOld); D? %*L  
 BITMAP btm; W)r|9G8T  
 bm.GetBitmap(&btm); mv:@D  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ;~:Z~8+{c  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); + >dC  
 BITMAPINFOHEADER bih; -{OJM|W+  
 bih.biBitCount=btm.bmBitsPixel; D.{vuftu  
 bih.biClrImportant=0; ==?wG!v2h  
 bih.biClrUsed=0; [DjlkA/Zg  
 bih.biCompression=0; h\@X!Z,  
 bih.biHeight=btm.bmHeight; 3lWGa7<4Z  
 bih.biPlanes=1; >g!$H}\  
 bih.biSize=sizeof(BITMAPINFOHEADER); n]#YL4j  
 bih.biSizeImage=size; !O!:=wq  
 bih.biWidth=btm.bmWidth; paV1o>_Rd  
 bih.biXPelsPerMeter=0; vo }4N[]Sb  
 bih.biYPelsPerMeter=0; Kn$E{F\  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <`SA >P  
 static int filecount=0; 83V\O_7j  
 CString name; F%y#)53g  
 name.Format("pict%04d.bmp",filecount++); :* |WE29U  
 name=m_Path+name; =3'B$PY  
 BITMAPFILEHEADER bfh; 1N$OXLu  
 bfh.bfReserved1=bfh.bfReserved2=0; { /!ryOA65  
 bfh.bfType=((WORD)('M'<< 8)|'B'); d1g7:s9$0  
 bfh.bfSize=54+size; (G+)v[f  
 bfh.bfOffBits=54; sYXLVJ>b  
 CFile bf; ^^ix4[1$Z  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ >V)#y$Z  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?H_@/?  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); D]iyr>V6'  
  bf.WriteHuge(lpData,size); 8~,zv_Pl  
  bf.Close(); 4>d]0=x  
  nCount++; 8u)>o* :  
 } k8n9zJ8  
 GlobalFreePtr(lpData); ECL{`m(#n  
 if(nCount==1) '@KH@~OzRS  
  m_Number.Format("%d picture captured.",nCount); Dj=$Q44  
 else (kX:@9Pn  
  m_Number.Format("%d pictures captured.",nCount); 3; z1Hp2X  
  UpdateData(FALSE); ? }ff O  
} ux^rF  
5#f_1 V  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) fGe ie m  
{ s~(`~Y4  
 if(pMsg -> message == WM_KEYDOWN) )Az0.}  
 { b (@GKH"W  
  if(pMsg -> wParam == VK_ESCAPE) .u&X:jOE  
   return TRUE; =[aiW|Y  
  if(pMsg -> wParam == VK_RETURN) A?n5;mvq#  
   return TRUE; bydI+pVMo  
 } Q1kM 4Up  
 return CDialog::PreTranslateMessage(pMsg); Qo3Enwap=  
} GE] QRKf  
N\]-/$z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3dZj<(.  
{ p<D@l2vt  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %=K[C  
  SaveBmp(); "+O/OKfR0  
  return FALSE; !} x-o`a5  
} mBye)q$  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ //r)dN^  
 CMenu pop; s."N7F  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); b~<V}tJ  
 CMenu*pMenu=pop.GetSubMenu(0); zI ^:{]p  
 pMenu->SetDefaultItem(ID_EXITICON); UT{`'#iT  
 CPoint pt; w `d9" n  
 GetCursorPos(&pt); H0B=X l[  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Y evd h<  
 if(id==ID_EXITICON) 8.wtv5eZ  
  DeleteIcon(); 4!ZT_q  
 else if(id==ID_EXIT) O`_, _  
  OnCancel(); )j}#6r  
 return FALSE; )J yB  
} LrdED[Z  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); @6!Myez'  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) pfc"^Gi8  
 AddIcon(); .*"KCQGOgM  
 return res; \TzBu?,v8  
} #:Q\   
QS4~":D/C  
void CCaptureDlg::AddIcon() S~m8j |3K  
{ nRX'J5Q m<  
 NOTIFYICONDATA data; (u@X5O(a  
 data.cbSize=sizeof(NOTIFYICONDATA); NyC&j`d  
 CString tip; TntTR"6aD  
 tip.LoadString(IDS_ICONTIP); =_N $0  
 data.hIcon=GetIcon(0); !w/fw Oo  
 data.hWnd=GetSafeHwnd(); VS`{k^^  
 strcpy(data.szTip,tip); OqH3. @eK  
 data.uCallbackMessage=IDM_SHELL; 58mpW`Q  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Z"Q9^;0%  
 data.uID=98; D\J.6W  
 Shell_NotifyIcon(NIM_ADD,&data); x<w-j[{k_K  
 ShowWindow(SW_HIDE); @Wm:Rz  
 bTray=TRUE; NTK9`#SA  
} =%I;Y& K  
-#4QY70H t  
void CCaptureDlg::DeleteIcon() 3 Sf':N`u  
{ ;U a48pSv  
 NOTIFYICONDATA data; ?Ec{%N%  
 data.cbSize=sizeof(NOTIFYICONDATA); GKUjtPu  
 data.hWnd=GetSafeHwnd(); k MV1$  
 data.uID=98; OM7AK B=S  
 Shell_NotifyIcon(NIM_DELETE,&data); fV6ddh  
 ShowWindow(SW_SHOW); 'F/uD 1;  
 SetForegroundWindow(); N3KI6p6\  
 ShowWindow(SW_SHOWNORMAL); hhU\$'0B-  
 bTray=FALSE; 5}5oj37x  
} 64"DT3:  
}=gD,]2x8  
void CCaptureDlg::OnChange() spQr1hx<  
{ q JtLJ<=1  
 RegisterHotkey(); {{pN7Z  
} y= 8SD7P'  
`d/* sX?k  
BOOL CCaptureDlg::RegisterHotkey() \?Xoa"^  
{ h^,L) E  
 UpdateData(); W"t^t|H'~  
 UCHAR mask=0; b>#dMRK  
 UCHAR key=0; ;/ |tU o$  
 if(m_bControl) psiuoYf  
  mask|=4; heWQPM|s  
 if(m_bAlt) Ix(,gDN  
  mask|=2; Ne3YhCC>  
 if(m_bShift) tK#/S+l  
  mask|=1; E 8$S0u;`  
  key=Key_Table[m_Key.GetCurSel()]; Y}C|4"V  
 if(bRegistered){ #tw_`yh  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ,@M<O!%Cs  
  bRegistered=FALSE;  Bw+ ?MdS  
 } :7Uv)@iUk  
 cMask=mask; '<e$ c  
 cKey=key; 4}*.0'Hz  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 9`^(M^|c  
 return bRegistered; k`z]l;:  
} S|6i]/  
xj AU Csq  
  四、小结  VS7  
U ){4W0  
  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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