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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: .Hhhi  
  Op.8a`XLt&  
  一、实现方法 }*]B-\>  
v1U?&C  
  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: )/ Ud^wi  
Rx07trfN  
#pragma data_seg("shareddata") =*BIB5  
HHOOK hHook =NULL; //钩子句柄 e;bYaM4 UX  
UINT nHookCount =0; //挂接的程序数目 Mpue   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Mvj;ic6iK  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 H?1xjY9sl  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey MmPU7Nl%X  
static int KeyCount =0; _3iHkQr  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 #H [Bb2(j  
#pragma data_seg() zo{/'BnU  
EqiFy"H  
  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。 O-vGyNxP|  
*YTo{~  
  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: =d 2r6%v  
MfF~8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR :pX`?Ew`g  
cKey,UCHAR cMask) _i_Q?w`  
{ ->z54 T  
 BOOL bAdded=FALSE; -Ue$T{;RoH  
 for(int index=0;index<MAX_KEY;index++){ \mM<\-'p  
  if(hCallWnd[index]==0){ |rw%FM{F  
   hCallWnd[index]=hWnd; N(6|yZ<J3M  
   HotKey[index]=cKey; mM.*b@d-  
   HotKeyMask[index]=cMask; !2\ r LN  
   bAdded=TRUE; gyHHoZc3  
   KeyCount++; ?,P3)&3g  
   break; <Tw>|cFT  
  } })xp%<`  
 } p=GWq(S6  
 return bAdded; ~\p]~qQ\K  
} ]  H~4  
//删除热键 v dbO(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .9*wY0:  
{ -hcS]~F  
 BOOL bRemoved=FALSE; qL6c`(0  
 for(int index=0;index<MAX_KEY;index++){ +i ?S  
  if(hCallWnd[index]==hWnd){ `=+^|Y}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]=rht9),"  
    hCallWnd[index]=NULL; hDP/JN8y  
    HotKey[index]=0; c@[:V  
    HotKeyMask[index]=0; WtQ8X|\`  
    bRemoved=TRUE; 4EI7W,y  
    KeyCount--; gXT9 r' k  
    break; .xzEAu;  
   } {u{@ jp  
  } ?SQE5Z  
 } |@?%Ct  
 return bRemoved; Sgim3):Z  
} CZnK8&VDY  
j hYToMq  
.Ig+Dj{)  
  DLL中的钩子函数如下: +h^jC9,m~{  
2M<R(W!&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) wS+V]`b  
{ <H3ezv1M  
 BOOL bProcessed=FALSE; 8 a!Rb-Q:  
 if(HC_ACTION==nCode) ,jA)wJ  
 { R2etB*k6[  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 spU)]4P&  
   switch(wParam) 0tIS Xu-  
   {  bawJ$_O_  
    case VK_MENU: "xcX' F^  
     MaskBits&=~ALTBIT; N#V.1<Y  
     break; I jr\5FA[p  
    case VK_CONTROL: !g~1&Uw1  
     MaskBits&=~CTRLBIT; 5Dp#u  
     break; ^ &E}r{?  
    case VK_SHIFT: kp?w2+rz  
     MaskBits&=~SHIFTBIT; 1XG!$ 4DW  
     break; OJT1d-5p  
    default: //judge the key and send message I{JU-J k|  
     break; 4p%A8%/q  
   } bn 6WjJ~Z+  
   for(int index=0;index<MAX_KEY;index++){ qbrpP(.  
    if(hCallWnd[index]==NULL) WPZ?*Sx  
     continue; u$%t)2+$4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U<XSj#&8|  
    { IJTtqo  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Qjx?ri//  
     bProcessed=TRUE; d\e7,"L*Q  
    } ]&Z))H  
   } d@w~[b  
  } iu**`WjI\  
  else if((lParam&0xc000ffff)==1){ //有键按下 gh`m*@  
   switch(wParam) `&0Wv0D0  
   { G;> _<22  
    case VK_MENU: 4tg<iH{  
     MaskBits|=ALTBIT; XxHx:mi  
     break; i'stw6*J  
    case VK_CONTROL: ,F&g5'  
     MaskBits|=CTRLBIT; VxP&j0M>  
     break; xw{-9k-~  
    case VK_SHIFT: T0)4v-EO  
     MaskBits|=SHIFTBIT; js1!9%BV  
     break; \ w3]5gJZ  
    default: //judge the key and send message %B.D^]S1:  
     break; nEzf.[+9/  
   } R1&unm0  
   for(int index=0;index<MAX_KEY;index++){ f= >O J!:  
    if(hCallWnd[index]==NULL) 1+b{}d  
     continue; '|;X0fD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e\O/H<  
    { TJE\A)|>g  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6y%0`!  
     bProcessed=TRUE; !+u"3;%h  
    } .4. b*5  
   } L@=3dp!\Cu  
  } dEBcfya  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 kq\)MQ"/X  
   for(int index=0;index<MAX_KEY;index++){ .CP& bJP%  
    if(hCallWnd[index]==NULL) zMIT}$L  
     continue; **69rN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {M,,npl  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); TW !&p"Us+  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 (&$VxuJ+6y  
   } %;#^l+UB  
  } cj11S>D  
 } MX@IHc  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !w BJ,&E  
} TAjh"JJIV  
(EPsTox  
  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: fs/*V~@  
j }b\Z9)!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); cqxVAzb  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); UH7jP#W%=  
ZiLj=bh  
  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: o1nURJ!  
o\vBOp?hj  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0M\D[ mg  
{ j,]Y$B  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ){jl a,[  
 { H@]MXP[_  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 mf'V)  
  SaveBmp(); :[;hu}!&  
  return FALSE; [w ;kkMJAy  
 } ybp -$e  
 …… //其它处理及默认处理 HR}bbsqxVf  
} pW4 cX  
;c$J=h]  
.k,YlFvj  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 CdL< *AH  
0527Wj  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ^*fQX1h<  
vloF::1  
  二、编程步骤 ftH:r_"O#  
DBP9{ x$  
  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"; 8QMPY[{   
!ct4;.2 D  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; I-OJVZ( V  
h=-"SW  
  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; 1;VHM'  
a&vY!vx 3  
  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; 4tY ss  
6;b~Ht  
  5、 添加代码,编译运行程序。 ]l8^KX'  
kQ]$%Lk[  
三、程序代码 ,@5I:X!rR  
v+9 9 -.  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL (5\N B0  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) tDUwy^j  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ O$4yAaD X  
#if _MSC_VER > 1000 nB .G  
#pragma once [=~pe|8:  
#endif // _MSC_VER > 1000 o6$4/I  
#ifndef __AFXWIN_H__ iYC9eEF  
#error include 'stdafx.h' before including this file for PCH \l~*PG2  
#endif 47J5oPT2'  
#include "resource.h" // main symbols $\9~)Rq6  
class CHookApp : public CWinApp 8V~vXnkM  
{  T Q,?>6n  
 public: 4*$G & TX  
  CHookApp(); R##~*>#  
  // Overrides mc4i@<_?  
  // ClassWizard generated virtual function overrides %.Q !oYehj  
  //{{AFX_VIRTUAL(CHookApp) W^"AU;^V56  
 public: JchSMc.9  
  virtual BOOL InitInstance(); 0wS+++n$5  
  virtual int ExitInstance(); K(aJi,e>  
  //}}AFX_VIRTUAL L@fY$Rw  
  //{{AFX_MSG(CHookApp) Q|@4bzi)  
  // NOTE - the ClassWizard will add and remove member functions here. Sfdu`MQR  
  // DO NOT EDIT what you see in these blocks of generated code ! *g^x*|f6  
  //}}AFX_MSG ,i@X'<;y  
  DECLARE_MESSAGE_MAP() !W?gR.0$=  
}; Kv~U6_=1O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); _o8 ?E&d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); S{3nM<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); JfPD}w  
BOOL InitHotkey(); G}p\8Q}'  
BOOL UnInit(); ++E3]X|  
#endif Z@r.pRr'  
6^DR0sO  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. $q 2D+_  
#include "stdafx.h" q:g2Zc'Y~W  
#include "hook.h" f7}*X|_Y  
#include <windowsx.h> A`R{m0A  
#ifdef _DEBUG jmeRrnC}  
#define new DEBUG_NEW &iV{:)L  
#undef THIS_FILE dUsx vho  
static char THIS_FILE[] = __FILE__; --DoB=5%8  
#endif 2PG [7u^  
#define MAX_KEY 100 "Iix )Ue  
#define CTRLBIT 0x04 g&{9VK6.  
#define ALTBIT 0x02 =z8f]/k*>  
#define SHIFTBIT 0x01 rXHv`k y  
#pragma data_seg("shareddata") [<KM?\"1<  
HHOOK hHook =NULL; yDGVrc'  
UINT nHookCount =0; k?7 X3/O  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey )rixMl &[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT edPUG N  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey H$6`{lx,  
static int KeyCount =0; r hfb ftw  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 0Zg%+)iy@  
#pragma data_seg() '}9JCJ  
HINSTANCE hins; VJS8)oI~  
void VerifyWindow(); +$Rt+S BD  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) e>AE8T  
//{{AFX_MSG_MAP(CHookApp) {` w;39$+  
// NOTE - the ClassWizard will add and remove mapping macros here. t2"FXTAq  
// DO NOT EDIT what you see in these blocks of generated code! vI@%Fg+D  
//}}AFX_MSG_MAP wiBVuj#  
END_MESSAGE_MAP() Ot`VR&}  
qcT'nZ:  
CHookApp::CHookApp() ,#8e_3Z$  
{ n..g~ $k  
 // TODO: add construction code here, ^urDoB:  
 // Place all significant initialization in InitInstance Q1z;/A$Al  
} C$5[X7'  
OD_W8!-  
CHookApp theApp; _l1NKk  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `ta7Gc/:UY  
{ \W`w` o  
 BOOL bProcessed=FALSE; fYW6b[lI  
 if(HC_ACTION==nCode) %D[0nt|X  
 { 95V@X ^Ee  
  if((lParam&0xc0000000)==0xc0000000){// Key up Zcc9e 03  
   switch(wParam)  ^k\e8F/  
   { p l&Muv  
    case VK_MENU: YtWJX kB  
     MaskBits&=~ALTBIT; ~#/hzS  
     break; C7O6qpO  
    case VK_CONTROL: /Js7`r=Rx  
     MaskBits&=~CTRLBIT; CH<E,Z C1T  
     break; b?'yAXk  
    case VK_SHIFT: +j4"!:N}B  
     MaskBits&=~SHIFTBIT; 4f;HQ-Iv  
     break; RZCq{|L  
    default: //judge the key and send message SZXY/~=h  
     break; pn^ d]rou?  
   } rX1QMR7?  
   for(int index=0;index<MAX_KEY;index++){ J^g!++|2P  
    if(hCallWnd[index]==NULL) |.3DD"*  
     continue; S)/_muP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &sd}ulEg`  
    { G}G#i`6o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); j.@\3'  
     bProcessed=TRUE; ,#kIr  
    } z+>}RT]  
   } WH \)) y-  
  } ::/j$bL  
  else if((lParam&0xc000ffff)==1){ //Key down 9U%N@Dq`Z  
   switch(wParam) 0MdDXG-7  
   { YGsWu7dG  
    case VK_MENU: /ID?DtJ  
     MaskBits|=ALTBIT; x>Jr_A(  
     break; GbaEgA'fa  
    case VK_CONTROL: f-7 1~  
     MaskBits|=CTRLBIT; FJ6u.u  
     break; }:~x7|~s:  
    case VK_SHIFT: ze]h..,]K  
     MaskBits|=SHIFTBIT; yiA<,!;4P  
     break; _:"<[ >9  
    default: //judge the key and send message Dv/WE>?Aw  
     break; D N*t~Z3[  
   } eh5gjSqx  
   for(int index=0;index<MAX_KEY;index++) _Wa. JUbv  
   { (/j); oSK  
    if(hCallWnd[index]==NULL) W!&vul5  
     continue; Jtk|w[4L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aX}P|l  
    { GF^071]G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Mwr"~?\\  
     bProcessed=TRUE; .uk>QM s1  
    } yT,.z 0  
   } KkE9KwZ]W  
  } fw RZ5`v<  
  if(!bProcessed){ I}vmU^Y>  
   for(int index=0;index<MAX_KEY;index++){ 9,r rQQD_  
    if(hCallWnd[index]==NULL) qm8&*UuKJ  
     continue; }x wu*Zx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) B[4KX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); S9",d~EM  
   } 8zR~d%pK  
  } <z!CDg4  
 } [n$BRk|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); UQI]>#_/v  
} hHMN6i  
byfJy^8G  
BOOL InitHotkey() ?28N ^  
{ r|qp3x  
 if(hHook!=NULL){ *^wm1|5  
  nHookCount++; [YcG(^^  
  return TRUE; McQe1  
 } 1cD! :[  
 else 2 FW \O0U  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 3z&Fi;<+j  
  if(hHook!=NULL) "UJ S5[7$  
   nHookCount++; f|tjsZxQ  
  return (hHook!=NULL); [F6U+1n8e  
} SK#(#OQoh  
BOOL UnInit() *9{Z$IA9w  
{ Ub * wuI  
 if(nHookCount>1){ uPl\I6k  
  nHookCount--; `p;I}  
  return TRUE; -B$2\ZE  
 } jyZWV L:_  
 BOOL unhooked = UnhookWindowsHookEx(hHook); eXf22;Lz  
 if(unhooked==TRUE){ b8LLr;oQw  
  nHookCount=0; y`XU~B)J1  
  hHook=NULL; O6G0  
 } :H wA 5Z#  
 return unhooked; )(384@'"u  
} A'&K/)Z  
-u8NF_{c  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ptZ <ow&  
{ ?TKRjgW`@_  
 BOOL bAdded=FALSE; E`uY1B[c  
 for(int index=0;index<MAX_KEY;index++){ SF<c0bR9  
  if(hCallWnd[index]==0){ %Va!\#  
   hCallWnd[index]=hWnd; `.Qi?* ^  
   HotKey[index]=cKey; &?yZv {  
   HotKeyMask[index]=cMask; bq:(u4 3  
   bAdded=TRUE; I\$X/t +dH  
   KeyCount++; cbT7CG  
   break; Tap.5jHL  
  } h9G RI  
 } MfWyc_  
 return bAdded; (j3xAA  
} YS*9t Q{  
-3=#u_  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?qWfup\S  
{ @6]sNm  
 BOOL bRemoved=FALSE; L$E{ycn  
 for(int index=0;index<MAX_KEY;index++){ F6{bjv2A  
  if(hCallWnd[index]==hWnd){ /Id%_,}Kb  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ [.uG5%fa  
    hCallWnd[index]=NULL; K8UP,f2  
    HotKey[index]=0; %*0^0wz  
    HotKeyMask[index]=0; 8Y7Q+p|O  
    bRemoved=TRUE; /q`xCS  
    KeyCount--; 0p}D(m2B  
    break; 2 Cv4=S  
   } YLzx<~E4a  
  } 2-Ej4I~  
 } VYk!k3qS  
 return bRemoved; jGpN,/VQa  
} Tw;3_Lj  
zPjHsulK  
void VerifyWindow() 9E>|=d|(d  
{ xY^ %&n  
 for(int i=0;i<MAX_KEY;i++){ 75/(??2  
  if(hCallWnd!=NULL){ 2bkX}FWd;  
   if(!IsWindow(hCallWnd)){ E{Ov>osq  
    hCallWnd=NULL; "q.\>MCv  
    HotKey=0; J2xw) +  
    HotKeyMask=0; G'ei/Me6{  
    KeyCount--; [Q/TlOt5  
   } ov_j4 j>6P  
  } [8=vv7wS  
 } )E-inHD /  
} AN/;)wc  
Pu*6"}#~  
BOOL CHookApp::InitInstance() lY?QQ01D  
{ Ne[7gxpu  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); < v@9#c  
 hins=AfxGetInstanceHandle(); q$B>|y U  
 InitHotkey(); xgKdMW'%g:  
 return CWinApp::InitInstance(); 'z%o16F)L  
} <YhB8W9 P  
ZL&g_jC  
int CHookApp::ExitInstance() W;!}#o|%s  
{ V4'YWdTi  
 VerifyWindow(); HoRg^Ai?\  
 UnInit(); )quM4=u'  
 return CWinApp::ExitInstance(); A|X">,A  
} /7|V+6jV  
; Q3n  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 'kL#]  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) <~n"m  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ @oV9)  
#if _MSC_VER > 1000 <FcG oGK  
#pragma once e} P I^bc  
#endif // _MSC_VER > 1000 "J [K 3  
|ZRagn30  
class CCaptureDlg : public CDialog lFV N07hG  
{ Rld!,t  
 // Construction IDB+%xl#S  
 public: D*gFV{ Ws  
  BOOL bTray; =E.t`x=  
  BOOL bRegistered;  ]%wVHC  
  BOOL RegisterHotkey(); N`L0Vd  
  UCHAR cKey; =WyZX 7@R  
  UCHAR cMask; LE9(fe) fe  
  void DeleteIcon(); ToXki,  
  void AddIcon(); MbZJ;,e?  
  UINT nCount; N D(/uyI  
  void SaveBmp(); di6QVRj1  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor _/6!yyl  
  // Dialog Data zxbpEJzpn  
  //{{AFX_DATA(CCaptureDlg) 8&?s#5zA  
  enum { IDD = IDD_CAPTURE_DIALOG }; i]6`LqlO  
  CComboBox m_Key; ->g*</  
  BOOL m_bControl; '%dfz K*Z  
  BOOL m_bAlt; x,|hU@h  
  BOOL m_bShift; V C24sU  
  CString m_Path; 'E/^8md>  
  CString m_Number; h?BFvbAt  
  //}}AFX_DATA T"E6y"D  
  // ClassWizard generated virtual function overrides i+S) K  
  //{{AFX_VIRTUAL(CCaptureDlg) YW_Q\|p]M  
 public: 1m:XR0P  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Sjyoc<Uo  
 protected: 17oa69G  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Q@<S[Qh[.  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); S+atn]eU@  
  //}}AFX_VIRTUAL VC\S'z  
  // Implementation \n8] M\<  
 protected: T|7}EAR=b  
  HICON m_hIcon; .<x&IJ /  
  // Generated message map functions gv)P]{%^  
  //{{AFX_MSG(CCaptureDlg) lOuHVa*}  
  virtual BOOL OnInitDialog(); \{Z; :,S  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); pb ~u E  
  afx_msg void OnPaint(); 1 u| wMO  
  afx_msg HCURSOR OnQueryDragIcon(); ?'@8kpb  
  virtual void OnCancel(); 5q;GIw^L  
  afx_msg void OnAbout(); UEM(@zD]  
  afx_msg void OnBrowse(); GqaDL3Niqs  
  afx_msg void OnChange(); 7=TF.TW)  
 //}}AFX_MSG v/68*,z[  
 DECLARE_MESSAGE_MAP() j53*E )d  
}; zr+zhpp  
#endif LcB]Xdsa(  
5_I->-<  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;#xmQi'`  
#include "stdafx.h" 4'`{H@]tb  
#include "Capture.h"  \N!AXD  
#include "CaptureDlg.h" '=nQ$/!q  
#include <windowsx.h> % NA9{<I  
#pragma comment(lib,"hook.lib") fPn>v)lN{  
#ifdef _DEBUG #sPHdz'3M  
#define new DEBUG_NEW 9`I _Et  
#undef THIS_FILE +*ZO&yJQ^<  
static char THIS_FILE[] = __FILE__; 6y+Kjd/D  
#endif -@yh> 8v  
#define IDM_SHELL WM_USER+1 [ sN EHf  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (@<lRA ^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4)h]MOZ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; )Dw,q~xgg0  
class CAboutDlg : public CDialog !}v=N";c  
{ p^%YBY#,H  
 public:  FT#8L  
  CAboutDlg(); u37'~&o{U  
  // Dialog Data s+,OxRVw(  
  //{{AFX_DATA(CAboutDlg) JJ}0gZ   
  enum { IDD = IDD_ABOUTBOX }; 8/i!' 0r\  
  //}}AFX_DATA M=F xB;v  
  // ClassWizard generated virtual function overrides z3&]%Q&  
  //{{AFX_VIRTUAL(CAboutDlg) ewa wL"  
 protected: h{HF8>u[  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support =(NB%}  
  //}}AFX_VIRTUAL -+ SF  
  // Implementation - }7e:!.  
 protected: QDs^Ije  
  //{{AFX_MSG(CAboutDlg) F(k.,0Nc  
  //}}AFX_MSG !MYSfPdS  
  DECLARE_MESSAGE_MAP() hAYTj0GZ  
};  x }\64  
b$ve sJ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) kbTm^y"  
{ f,V<;s  
 //{{AFX_DATA_INIT(CAboutDlg) @ezH'y-v  
 //}}AFX_DATA_INIT \m7-rV6r  
} Qy^1*j<@&  
UDL!43K  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) R:e<W/P"  
{ q qpgy7  
 CDialog::DoDataExchange(pDX); PD&\LbuG  
 //{{AFX_DATA_MAP(CAboutDlg) u<3HQ.:;  
 //}}AFX_DATA_MAP OMWbZ>jB  
} vwjPmOjhS  
rai3<_W<  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ROg(U8 N  
 //{{AFX_MSG_MAP(CAboutDlg) 0fb`08,^  
 // No message handlers u.d).da  
 //}}AFX_MSG_MAP C8[&S&<_<  
END_MESSAGE_MAP() &Q;sSIc  
Ss~;m']68  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) "x=f=;  
: CDialog(CCaptureDlg::IDD, pParent) !/}O>v~o  
{ =Z P%mW&;}  
 //{{AFX_DATA_INIT(CCaptureDlg) ?o oe'V@  
  m_bControl = FALSE; wfU7G[  
  m_bAlt = FALSE; eqP&8^HP  
  m_bShift = FALSE; "^w]_^GD$d  
  m_Path = _T("c:\\"); 0Sle  
  m_Number = _T("0 picture captured."); q*\x0"mS/  
  nCount=0; p<TpK )  
  bRegistered=FALSE; ?]Pmxp H}  
  bTray=FALSE; CN#+U,NZV  
 //}}AFX_DATA_INIT lsNrAA%m  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ;3d"wW]}7K  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ]l1\? I  
} a:"Uh**  
^* J2'X38I  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) S0~2{ G"v  
{ =U#dJ^4P  
 CDialog::DoDataExchange(pDX); m@"QDMHk.  
 //{{AFX_DATA_MAP(CCaptureDlg) #JgH}|&a$  
  DDX_Control(pDX, IDC_KEY, m_Key); W%T>SpFl  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 73V|6tmgY  
  DDX_Check(pDX, IDC_ALT, m_bAlt); q}~3C1  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); qQA}Z*( m  
  DDX_Text(pDX, IDC_PATH, m_Path); q*F{/N **  
  DDX_Text(pDX, IDC_NUMBER, m_Number); dRj|g  
 //}}AFX_DATA_MAP LV\DBDM  
} GB>QK  
rs,2rSsg!  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) +V m}E0Ov  
//{{AFX_MSG_MAP(CCaptureDlg) 2q3+0Et8  
 ON_WM_SYSCOMMAND() )Y2{_ bx4"  
 ON_WM_PAINT() Gnfd;. (.  
 ON_WM_QUERYDRAGICON() 4US"hexE<  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) #0ETY\}ZD  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) S{;sUGcu  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Pl=ZRKn  
//}}AFX_MSG_MAP R%Q@   
END_MESSAGE_MAP() bn^{c  
PV9pa/`@  
BOOL CCaptureDlg::OnInitDialog() `S6x<J&T\/  
{ Sx?ua<`:d  
 CDialog::OnInitDialog(); JHz [7  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); pQshUm"_  
 ASSERT(IDM_ABOUTBOX < 0xF000); S `#w+C#EW  
 CMenu* pSysMenu = GetSystemMenu(FALSE); -j73Wz  
 if (pSysMenu != NULL) G]+&!4  
 { k`0>36  
  CString strAboutMenu; A%`[mc]4#  
  strAboutMenu.LoadString(IDS_ABOUTBOX); V'kX)$  
  if (!strAboutMenu.IsEmpty()) zUKmxy@  
  { G '6@+$ppS  
   pSysMenu->AppendMenu(MF_SEPARATOR); Qp/QaVQ+  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Tav*+  
  } H*[ M\gN$  
 } X:6c}p%,!  
 SetIcon(m_hIcon, TRUE); // Set big icon &?q/1vLa  
 SetIcon(m_hIcon, FALSE); // Set small icon JBJhG<J  
 m_Key.SetCurSel(0); W_kHj}dj,p  
 RegisterHotkey(); kPVO?uO  
 CMenu* pMenu=GetSystemMenu(FALSE); LL2=&VK  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 8g&? Cc  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); kKAP"'v  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND);  .Nw=[  
 return TRUE; // return TRUE unless you set the focus to a control W7U2MqQ  
} #=6E\&NC  
W}5xmz  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) kL$!E9  
{ B?4boF?~  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) n}'=yItVL1  
 { vU767/  
  CAboutDlg dlgAbout; 95YL]3V  
  dlgAbout.DoModal(); %] >KvoA  
 } pgOQIzu  
 else @^T1XX  
 { ~C>?W[Y  
  CDialog::OnSysCommand(nID, lParam); c&AygqN  
 } !{^PO <9  
} S4G^z}{_  
*QLI3B9V  
void CCaptureDlg::OnPaint() b*`lk2oMa/  
{ ZaL.!g  
 if (IsIconic()) 7cTV?nc  
 { w)Q0_2p.  
  CPaintDC dc(this); // device context for painting Vl:^>jTki  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); D'J 0wT#  
  // Center icon in client rectangle CbwJd5tk  
  int cxIcon = GetSystemMetrics(SM_CXICON); #wV8X`g  
  int cyIcon = GetSystemMetrics(SM_CYICON); ](&{:>RNJ  
  CRect rect; O+]Ifm[  
  GetClientRect(&rect); | h;0H`  
  int x = (rect.Width() - cxIcon + 1) / 2; Kac' ;1  
  int y = (rect.Height() - cyIcon + 1) / 2; rNB_W.  
  // Draw the icon B oC5E#;G  
  dc.DrawIcon(x, y, m_hIcon); W3 'q\+  
 } P/Q!<I  
 else K#pNe c  
 { \=6l9Lrj>h  
  CDialog::OnPaint(); &ge "x{,?  
 } 4scNSeW  
} XDFx.)t  
~zJ?H<>  
HCURSOR CCaptureDlg::OnQueryDragIcon() Ib+Y~ XYR  
{ V+VkY3  
 return (HCURSOR) m_hIcon; 4<k9?)~(J  
} /+@p7FqlE  
}Q=!Y>Tc  
void CCaptureDlg::OnCancel() dvt9u9Vg=  
{ T`5bZu^c  
 if(bTray) -( f)6a+H  
  DeleteIcon(); MP!d4  
  CDialog::OnCancel(); PX<J&rx  
} a=hxJ1O  
!*oi!ysU;O  
void CCaptureDlg::OnAbout() " N9 <wU  
{ 8 0Gn%1A9  
 CAboutDlg dlg; 'H \9:7  
 dlg.DoModal(); =Ur}~w&H8  
} aB7+Tb  
][?G/*k  
void CCaptureDlg::OnBrowse() Ry%Mej:  
{ .6`9H 1  
 CString str; &(xH$htv1  
 BROWSEINFO bi; i 7x7xtq  
 char name[MAX_PATH]; L{h%f4Du#  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); A29gz:F(  
 bi.hwndOwner=GetSafeHwnd(); |j#C|V%kV  
 bi.pszDisplayName=name; 1 D<_N  
 bi.lpszTitle="Select folder"; J"=vE=  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ^yyC [Mz  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?TU}~}  
 if(idl==NULL) t.`@{R$hoA  
  return; bO'Sgc[]  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); i`dC G[  
 str.ReleaseBuffer(); w*oQ["SL  
 m_Path=str; 9983aFam  
 if(str.GetAt(str.GetLength()-1)!='\\') ?e,pN,4  
  m_Path+="\\"; >h k=VyU;  
 UpdateData(FALSE); )u/yF*:n  
} 6^%68N1k  
dIRm q+d^  
void CCaptureDlg::SaveBmp() Qj.l:9%  
{ l}] t~!X=  
 CDC dc; 5[* qi?w=  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); _Jme!Oaa  
 CBitmap bm; }Rz3<eON  
 int Width=GetSystemMetrics(SM_CXSCREEN); eC[$B99\  
 int Height=GetSystemMetrics(SM_CYSCREEN); kH]yl 2  
 bm.CreateCompatibleBitmap(&dc,Width,Height); fO0XA"=  
 CDC tdc; Hhari!R XC  
 tdc.CreateCompatibleDC(&dc); 2@%$;.  
 CBitmap*pOld=tdc.SelectObject(&bm); <iH`rP#  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ^OstR`U3  
 tdc.SelectObject(pOld); K)Q]a30  
 BITMAP btm; <xgTS[k  
 bm.GetBitmap(&btm); PzA|t;*  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ~~SwCXZ+b^  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); >i5acuth  
 BITMAPINFOHEADER bih; b0Kc^uj5  
 bih.biBitCount=btm.bmBitsPixel; m6',SY9T  
 bih.biClrImportant=0; ^!9~Nwn  
 bih.biClrUsed=0; Cb9;QzBVA#  
 bih.biCompression=0; p' +  
 bih.biHeight=btm.bmHeight; ds?v'|  
 bih.biPlanes=1; LAd\Tvms  
 bih.biSize=sizeof(BITMAPINFOHEADER); )FpZPdN+h  
 bih.biSizeImage=size; N(y\dL=v  
 bih.biWidth=btm.bmWidth; q^r#F#*1l  
 bih.biXPelsPerMeter=0; 89wU-Aggq  
 bih.biYPelsPerMeter=0; ~Uxsn@nLr  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); uoXAQ6k  
 static int filecount=0; L7V G`h;  
 CString name; \>7^f 3m  
 name.Format("pict%04d.bmp",filecount++); O }(VlR2  
 name=m_Path+name; ^V#@QPK9  
 BITMAPFILEHEADER bfh; lsy?Ac  
 bfh.bfReserved1=bfh.bfReserved2=0; GQ9\'z#+  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 7D!u1?]d{  
 bfh.bfSize=54+size; KN7n@$8YM  
 bfh.bfOffBits=54; 76Vl6cPu>  
 CFile bf; Er+nk`UR_  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ j4;0|zx-i  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); A9kzq_ 3  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Zxbo^W[[  
  bf.WriteHuge(lpData,size); #1c_evH  
  bf.Close(); H Ge0hl[n  
  nCount++; V( -mD  
 } *{y K 8  
 GlobalFreePtr(lpData); {6~l$  
 if(nCount==1) []A%<EI7  
  m_Number.Format("%d picture captured.",nCount); /k<WNZM  
 else C\di7z:  
  m_Number.Format("%d pictures captured.",nCount); !kE-_dY6)  
  UpdateData(FALSE); ;ByOth|9P  
} /6h(6 *JI  
hrhb!0  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Xt#4/>dlR  
{ qt;y2gf=  
 if(pMsg -> message == WM_KEYDOWN) Hrzf'a|^  
 { >&p0d0  
  if(pMsg -> wParam == VK_ESCAPE) t$A%*JBKm  
   return TRUE; %"af748!+D  
  if(pMsg -> wParam == VK_RETURN) -$WYj "  
   return TRUE; L30$%G|  
 } e}.^Tiwd]  
 return CDialog::PreTranslateMessage(pMsg); k31I ysh  
} ^ 8@Iyh  
|'{zri|A"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) aMvI?y {  
{ 7 <Q5;J&;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ )I$q5%q8  
  SaveBmp(); ;\\@q"n%<  
  return FALSE; Vgyew9>E  
} 6p?JAT5  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ \@1=stK:F  
 CMenu pop; k:#P|z$UD  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,iv|Pq $!  
 CMenu*pMenu=pop.GetSubMenu(0); ")!,ZD  
 pMenu->SetDefaultItem(ID_EXITICON); #*g5u{k'P  
 CPoint pt; `zE}1M%y  
 GetCursorPos(&pt); |7}C QU  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); a'jR#MQl?  
 if(id==ID_EXITICON) ?zsB6B?;  
  DeleteIcon(); 8krpowVs~  
 else if(id==ID_EXIT) cPU/t kc  
  OnCancel(); rn=m\Gv e  
 return FALSE; sSQs#+ &=[  
} `A,g] 1C:  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); A%{W{UP8N  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) LJ(1RK GCz  
 AddIcon(); A^2Uzmzl?  
 return res; &g~ wS@  
} KhW;RD  
$LLA,?;!  
void CCaptureDlg::AddIcon() t6A:Z mG_  
{ 1s{^X -  
 NOTIFYICONDATA data; {nvLPUL  
 data.cbSize=sizeof(NOTIFYICONDATA); GKFq+]W  
 CString tip; 3RR_fmMT)  
 tip.LoadString(IDS_ICONTIP); 1[t=XDz/e  
 data.hIcon=GetIcon(0); U=o"32n+  
 data.hWnd=GetSafeHwnd(); zKsz*xv6b  
 strcpy(data.szTip,tip); v !FMs<  
 data.uCallbackMessage=IDM_SHELL; {s_+?<l  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8-Hsgf.*  
 data.uID=98; Z+StB15  
 Shell_NotifyIcon(NIM_ADD,&data); 3:f[gV9K  
 ShowWindow(SW_HIDE); r@o6voX  
 bTray=TRUE; 0`I-2M4F*Q  
} Iy.rqc/86  
-p E(_  
void CCaptureDlg::DeleteIcon() { vN}<f`  
{ YNBHBK4;  
 NOTIFYICONDATA data; ,s_T pq  
 data.cbSize=sizeof(NOTIFYICONDATA); viAMr"z  
 data.hWnd=GetSafeHwnd(); jOyvDY9\  
 data.uID=98; j $TwL;  
 Shell_NotifyIcon(NIM_DELETE,&data); ]d]JXt?)i  
 ShowWindow(SW_SHOW); j* *s^Sg  
 SetForegroundWindow(); vUnRi=:|  
 ShowWindow(SW_SHOWNORMAL); !QT'L,_  
 bTray=FALSE; 2"d!(J6}K  
} u]ZqOJXxu  
KV*xApb9y  
void CCaptureDlg::OnChange() }irn'`I  
{ bC3 F  
 RegisterHotkey(); 4ON_$FUe  
} _%x4ty  
i]#+1Hf  
BOOL CCaptureDlg::RegisterHotkey() s#S%#LM  
{ R3!@?mcr  
 UpdateData(); Cua%1]"4w  
 UCHAR mask=0; e[Jem5C  
 UCHAR key=0; E3*\ ^Q_  
 if(m_bControl) ,~);EC=`  
  mask|=4; XJ0oS32_wK  
 if(m_bAlt) CY& hIh~S@  
  mask|=2; ]D!k&j~P  
 if(m_bShift) "9bN+1[<  
  mask|=1; 9P<[7u  
  key=Key_Table[m_Key.GetCurSel()]; _"%B7FK  
 if(bRegistered){ toaYsiIkzW  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ~6 I)|^Z  
  bRegistered=FALSE; BnM4T~reOF  
 } I Nc^L  
 cMask=mask; _zu?.I0^  
 cKey=key; ~-83Q5/[  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); //&j<vu s  
 return bRegistered; N7s'6(`=X  
} x+@&(NMP5  
,o7hk{fR*  
  四、小结 lMz<s  
:SsUdIX;P  
  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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