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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: @)BO`;*$fF  
  Kxch.$hc,  
  一、实现方法 M+0PEf.  
gfs;?vP  
  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: 1$8@CT^m  
V ^+p:nP  
#pragma data_seg("shareddata") &iInru3  
HHOOK hHook =NULL; //钩子句柄 3*& Y'/!  
UINT nHookCount =0; //挂接的程序数目 )Xh}N  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4;I\% qes  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ujRXAN@mC  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ICb!AsL  
static int KeyCount =0; #n'.a1R  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 >UMxlvTg&  
#pragma data_seg() |)+ SG>-  
~%8P0AP  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 eD?&D_l~6  
7IkPi?&{  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 54CJ6"q  
iCPm7AU  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR `R$i|,9 )  
cKey,UCHAR cMask) .P$m?p#  
{ ~<?Zj  
 BOOL bAdded=FALSE; O|V0WiY<  
 for(int index=0;index<MAX_KEY;index++){ BYB4- ,  
  if(hCallWnd[index]==0){ V9,<>  
   hCallWnd[index]=hWnd; _6nAxm&x`%  
   HotKey[index]=cKey; |gA@WV-%  
   HotKeyMask[index]=cMask; 3)y1q>CQf  
   bAdded=TRUE; Jv8:GgSg  
   KeyCount++; lN#j%0MaUo  
   break; J5G<Y*q  
  } W;Y^(f  
 } 2n,z`(=  
 return bAdded; |n/;x$Cb  
} 6u0>3-[6OD  
//删除热键 [(heE  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) o]q~sJVk6  
{ Jh3  
 BOOL bRemoved=FALSE; cuN9R G  
 for(int index=0;index<MAX_KEY;index++){ y>EW,%leC  
  if(hCallWnd[index]==hWnd){ z2iMpZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ hzsQK _;S  
    hCallWnd[index]=NULL; 1'qXT{f/~  
    HotKey[index]=0; ~HB#7+b  
    HotKeyMask[index]=0; DK74s  
    bRemoved=TRUE; iT}>a30]B  
    KeyCount--; t`Kpbfk  
    break; ga;nM#/  
   } 9;+&}:IVS  
  } ij$NTY=u  
 } H~Uf2A)C  
 return bRemoved; uO]D=Z\S(  
} !T,<p    
LP"g(D2'n  
8\rca:cF   
  DLL中的钩子函数如下: wH ,PA:  
(%X *b.n=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5p#0K@`n/  
{ sfX~X/  
 BOOL bProcessed=FALSE; cy8>M))c  
 if(HC_ACTION==nCode) q-(~w!e  
 { cb^IJA9}  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Qn$'bK2V  
   switch(wParam) I6^y` 2X  
   {  uOv<*Jld*  
    case VK_MENU: epsRv&LfC  
     MaskBits&=~ALTBIT; PaaMh[OmG  
     break; *|y'%y  
    case VK_CONTROL: nX!%9x$3  
     MaskBits&=~CTRLBIT; g=\(%zfsxr  
     break; CH4Nz'X2  
    case VK_SHIFT: 2H`r:x<Z-  
     MaskBits&=~SHIFTBIT; \^(#b,k#  
     break; ~!({U nt+'  
    default: //judge the key and send message nOPB*{r|  
     break; Tv|'6P  
   } E <yQB39  
   for(int index=0;index<MAX_KEY;index++){ w: BJ4bi=  
    if(hCallWnd[index]==NULL) P'Y(f!%  
     continue; (f&V 7n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7**zb"#y  
    { 2?ue.1C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); < dE7+w  
     bProcessed=TRUE; \Q#pu;Y*N]  
    } I;XM4a  
   } RhJ3>DL  
  } /uWUQ#9  
  else if((lParam&0xc000ffff)==1){ //有键按下 YHN6/k7H  
   switch(wParam) \l=A2i7TQ  
   { <IZr..|O  
    case VK_MENU: F7}yt  
     MaskBits|=ALTBIT; H2],auBY  
     break; gkK(7=r%  
    case VK_CONTROL: 8;qOsV)UDT  
     MaskBits|=CTRLBIT; GNW$:=0u  
     break; W(qK?"s2  
    case VK_SHIFT: s1OSuSL>  
     MaskBits|=SHIFTBIT; z/j*zU `  
     break; @^0}wk  
    default: //judge the key and send message bSTori5  
     break; 9uxoMjR-  
   } /\fR6|tJ  
   for(int index=0;index<MAX_KEY;index++){ &4wSX{c/P  
    if(hCallWnd[index]==NULL) x6aVNH=  
     continue; ;- i)}<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "X<V>q$0~c  
    { xz`0V}dPl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^d>m`*px  
     bProcessed=TRUE; fm#7}Y  
    } sfVzVS[  
   } c @lF*"4  
  } QfjoHeG7  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 yTc&C)Jba  
   for(int index=0;index<MAX_KEY;index++){ *k\ ;G?  
    if(hCallWnd[index]==NULL) Wu,=jL3?$A  
     continue; An]Vx<PD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) l(MjLXw5  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); P{RGW.Ci@  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Y;\@ 5TgQ,  
   } 6=%\@  
  } f !7fz~&Sh  
 } 7iy2V;}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2(Xu?W 7d  
} 'Q* .[aJt  
0{!-h  
  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: t%y i3  
.' v$PEy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Vf(..8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); OZKZv,  
"6~+ -_:  
  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: ,-n_( U  
&G-dxET]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^S|}<6~6b  
{ TPj,4&|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) [$]-W$j+  
 { ocS}4.a@  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 >kuu\  
  SaveBmp(); m8l!+8  
  return FALSE; -Zg.o$  
 } C szZr>Z  
 …… //其它处理及默认处理 s=R^2;^  
} T7Y+ WfYh  
1Fsa}UK  
Y6jgAq  
  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。 *\0h^^|@  
z2A,*|I  
  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。 Qdy/KL1]  
fG@]G9Z  
  二、编程步骤 H-% B<7  
M^n^wz  
  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"; PmE 8O  
^C2SLLgeJ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; M3fTU CR  
n482?Wp  
  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; /mn'9=ks  
Q0XSQOl  
  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; T#}"?A|  
H:q;IYE+a  
  5、 添加代码,编译运行程序。 (s51GRC  
RRpCWc Iv"  
三、程序代码 %mS>v|  
,W$&OD  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 6anH#=(  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) SO`b+B  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Q+IB&LdE  
#if _MSC_VER > 1000 0c&DSL}6  
#pragma once ~kI$8oAry  
#endif // _MSC_VER > 1000 OFZo"XtF  
#ifndef __AFXWIN_H__ wk2Ff*&  
#error include 'stdafx.h' before including this file for PCH 8wCB}qC  
#endif Tog'3k9Uw  
#include "resource.h" // main symbols "i%=QON`  
class CHookApp : public CWinApp Jb|dpu/e  
{ @f#6Nu  
 public: b~!Q3o'W  
  CHookApp(); LP>GM=S#"  
  // Overrides ,H] S-uK~  
  // ClassWizard generated virtual function overrides $F@ ,,*  
  //{{AFX_VIRTUAL(CHookApp) 7! /+[G  
 public: *n9=Q9  
  virtual BOOL InitInstance(); b}ODc]3  
  virtual int ExitInstance(); gS!zaD7Nr  
  //}}AFX_VIRTUAL !!)NER-dv  
  //{{AFX_MSG(CHookApp) rDLgQ{Sea  
  // NOTE - the ClassWizard will add and remove member functions here. 1 l-Y)   
  // DO NOT EDIT what you see in these blocks of generated code ! <SSkCw  
  //}}AFX_MSG 2GRv%:rZ  
  DECLARE_MESSAGE_MAP() ._6Q "JAB  
}; `>HrO}x^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); S3y(' PeF  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); D0X!j,Kc  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Z1U@xQj  
BOOL InitHotkey(); B# o6UO\  
BOOL UnInit(); CS;4ysNf  
#endif .|KBQMI  
 qy/t<2'  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 1-s G`%  
#include "stdafx.h" ;IR.6k$;  
#include "hook.h" ;esOe\z jE  
#include <windowsx.h> ^(Wu$\SA  
#ifdef _DEBUG Am"&ApK  
#define new DEBUG_NEW PeJIa %iE  
#undef THIS_FILE ZDmY${J  
static char THIS_FILE[] = __FILE__; %0%Tp  
#endif !d1a9los  
#define MAX_KEY 100 5I/lFoy7  
#define CTRLBIT 0x04 ULzrJbP'7  
#define ALTBIT 0x02 `r&]Ydu:  
#define SHIFTBIT 0x01 h*\u0yD)  
#pragma data_seg("shareddata") pL2{zW`FDh  
HHOOK hHook =NULL; _>4)q=  
UINT nHookCount =0; M[QQi2:&  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey c-ql  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT |u+!CR  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey /z: mi  
static int KeyCount =0; H`rd bE  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift plM:7#eA  
#pragma data_seg() V+t's*9o3  
HINSTANCE hins; m"wP]OQH*+  
void VerifyWindow(); N t\ZM  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) sEi9<$~R@0  
//{{AFX_MSG_MAP(CHookApp) LHSbc!Y'.  
// NOTE - the ClassWizard will add and remove mapping macros here. jW>K#vj  
// DO NOT EDIT what you see in these blocks of generated code! }ldpudU  
//}}AFX_MSG_MAP 664D5f#EJ  
END_MESSAGE_MAP() w YQEm  
$CZ'[`+  
CHookApp::CHookApp() ~JO.h$1C  
{ KtHkLYOCG  
 // TODO: add construction code here, :TkMS8  
 // Place all significant initialization in InitInstance ;RYIc0%  
} <(i5hmuVd  
&d\ y:7  
CHookApp theApp; ~ 7<M6F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) < pZwM  
{ [pInF Qh6  
 BOOL bProcessed=FALSE; JX{_,2*$  
 if(HC_ACTION==nCode) /i#";~sO  
 { ?hViOh$.  
  if((lParam&0xc0000000)==0xc0000000){// Key up .eLd0{JtN  
   switch(wParam) 4iss j$  
   { QQv%>=_`  
    case VK_MENU: D"%>  
     MaskBits&=~ALTBIT; Y=5P=wE  
     break; m"QDc[^Ge  
    case VK_CONTROL: (e0(GOqf4  
     MaskBits&=~CTRLBIT; aemi;61T\  
     break; <y?=;54a  
    case VK_SHIFT: f+8 QAvh  
     MaskBits&=~SHIFTBIT; [bRE=Zr$Ry  
     break; # 1dg%  
    default: //judge the key and send message MzDosr3:  
     break; Nd&UWk^  
   } 9zY6hh**  
   for(int index=0;index<MAX_KEY;index++){ P^tTg  
    if(hCallWnd[index]==NULL) pdvnpzj  
     continue; !-%XrU8o3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [FLR&=.(  
    { 8KYIHw  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); hS&l4 \I'Z  
     bProcessed=TRUE; YV!hlYOBi  
    } P-3f51Q  
   } 6?;z\ AP&  
  } !?=U{^|7y  
  else if((lParam&0xc000ffff)==1){ //Key down @5ud{"|2  
   switch(wParam) T6QRr}8`/J  
   { 8;r#HtFM  
    case VK_MENU: 5OzEY7K)  
     MaskBits|=ALTBIT; kguZAO6  
     break; dvU{U@:sz  
    case VK_CONTROL: Fj]06~u  
     MaskBits|=CTRLBIT; =^i K^)  
     break; bwH[rT!n  
    case VK_SHIFT: CH&{x7$he  
     MaskBits|=SHIFTBIT; lo(C3o'  
     break; "r* `*1  
    default: //judge the key and send message O^j*"#f  
     break; n:P:im?,y*  
   } x7U=1y(  
   for(int index=0;index<MAX_KEY;index++) 28`s+sH  
   { kS8?N`2}LV  
    if(hCallWnd[index]==NULL) zQG{j\  
     continue; %9a3$OGZX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t>/x-{bH\  
    { ,(pp+hNq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); . ump? M  
     bProcessed=TRUE; oJ\g0|\qwe  
    } ?-vWNv  
   } q]I aRho  
  } )c{>@WM~  
  if(!bProcessed){ 8hD[z}  
   for(int index=0;index<MAX_KEY;index++){ fg3Jv*  
    if(hCallWnd[index]==NULL) PPr Pj^%z=  
     continue; t`+A;%=K]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) dN)8r  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Xt<1b  
   } h_[{-WC  
  } gTXpaB<  
 } W.MZN4=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $Gv@lZ@=  
} $R/@8qnP W  
1+uZF  
BOOL InitHotkey() $t.oGd@N  
{ ( .cA'f?h  
 if(hHook!=NULL){ )>:~XA|?  
  nHookCount++; $|-Lw!)D  
  return TRUE; "u!gfG?oH  
 } *VsVCUCz5*  
 else kt2_WW[  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Wvf>5g)?  
  if(hHook!=NULL) Fm0d0j  
   nHookCount++; X$we\t  
  return (hHook!=NULL); .EL3}6"A  
} N7_eLhPt*8  
BOOL UnInit() 6I +0@,I  
{ r6Yd"~ n  
 if(nHookCount>1){ UpGDLbf^  
  nHookCount--; KHML!f=mu  
  return TRUE; |VWT4*K  
 } 7sxX?u  
 BOOL unhooked = UnhookWindowsHookEx(hHook); YQ G<Q  
 if(unhooked==TRUE){ U]sAYp^$  
  nHookCount=0; 0vm>*M*p  
  hHook=NULL;  n?EgC8b9  
 } iH }-  
 return unhooked; uGMzU&+  
} (w hl1  
o:AfEoH"~  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) pXSShU#  
{ "#r)NYq`"|  
 BOOL bAdded=FALSE; ?7aZU  
 for(int index=0;index<MAX_KEY;index++){  p@ ^G)x  
  if(hCallWnd[index]==0){ 5)!g.8-!  
   hCallWnd[index]=hWnd; \0b}Z#'0  
   HotKey[index]=cKey; nnv|GnQST  
   HotKeyMask[index]=cMask; MNd\)nX  
   bAdded=TRUE; WP L@v+  
   KeyCount++; ^HC 6v;K  
   break; Jbu2y'zE  
  } /sA&}kX}E  
 } k7CKl;Fck  
 return bAdded; |sZqqgZ-  
} ?R)]D:`  
l{k_;i!D  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) XIdh9)]^}  
{ 5?7AzJl>  
 BOOL bRemoved=FALSE; dkC[SG`  
 for(int index=0;index<MAX_KEY;index++){ h:?^0b!@  
  if(hCallWnd[index]==hWnd){ Nc:s+ o  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ R/+$ :  
    hCallWnd[index]=NULL; [8iY0m_Qe  
    HotKey[index]=0; BX >L7n  
    HotKeyMask[index]=0; M R#*/Iw~  
    bRemoved=TRUE; npdljLN  
    KeyCount--; IO\4dU)  
    break; ^m qEKy<  
   } yKc-:IBb{u  
  } /{^k8 Q  
 } ETp?RWXX  
 return bRemoved; .IeO+RDQ  
} EgjJywNhd2  
'R 7 \  
void VerifyWindow() n>Ff tVZNJ  
{ en<~_|J  
 for(int i=0;i<MAX_KEY;i++){ [l23b{  
  if(hCallWnd!=NULL){ f"ezmZI  
   if(!IsWindow(hCallWnd)){ * ,hhX psa  
    hCallWnd=NULL; HlGSt$woX  
    HotKey=0; -o ).<&#  
    HotKeyMask=0; XiW1X6  
    KeyCount--; Zy}tZRG  
   } '~[8>Q>  
  } WK{`_c U^  
 } > i/jqT/  
} Vj*-E  
-%asHDQ{  
BOOL CHookApp::InitInstance() ( S[z  
{ ^b8~X [1J_  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); :{7+[LcH7  
 hins=AfxGetInstanceHandle(); /"{d2  
 InitHotkey(); <Ky-3:pxeM  
 return CWinApp::InitInstance(); &2 tfj(ms  
} :Jd7q.  
wI.aV>  
int CHookApp::ExitInstance() M(-)\~9T  
{ fUT[tkb/!  
 VerifyWindow(); -  x  
 UnInit(); F? #3  
 return CWinApp::ExitInstance(); '/d51  
} t>j_C{X1(  
f{sT*_at  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file }`tSRB7  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) L:i&OCU2k  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ hkMeUxS  
#if _MSC_VER > 1000 !]4u"e  
#pragma once d ^bSV4  
#endif // _MSC_VER > 1000 r.C6` a  
;:;E|{e  
class CCaptureDlg : public CDialog 8g#$Y2P  
{  }k^uup*{  
 // Construction =ZgueUz,  
 public: JF=R$!5  
  BOOL bTray; v:O{"s  
  BOOL bRegistered; h]4xS?6O  
  BOOL RegisterHotkey(); %|-N{>wKy  
  UCHAR cKey; Al$z.i?R  
  UCHAR cMask; k/K)nH@)  
  void DeleteIcon(); egoR])2>  
  void AddIcon(); EGu%;[  
  UINT nCount; E_,/)U8  
  void SaveBmp(); k8gH#ENNK  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor J Enjc/  
  // Dialog Data J)|3jbX"I]  
  //{{AFX_DATA(CCaptureDlg) eg[EFI.h  
  enum { IDD = IDD_CAPTURE_DIALOG }; ]*0zir/  
  CComboBox m_Key; <8r"QJY/  
  BOOL m_bControl; 4_#$k{  
  BOOL m_bAlt; ?ANW I8'_j  
  BOOL m_bShift; Cfi{%,em  
  CString m_Path; .:S/x{~  
  CString m_Number; 66=[6U9 *  
  //}}AFX_DATA GS;GJsAs  
  // ClassWizard generated virtual function overrides =z1Lim-  
  //{{AFX_VIRTUAL(CCaptureDlg) 4n,&,R r#  
 public: g~U( w  
  virtual BOOL PreTranslateMessage(MSG* pMsg); y_X6{}Ke  
 protected: Fis!MMh.$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support FXCBX:LnvU  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); T3 w%y`K  
  //}}AFX_VIRTUAL h+km?j  
  // Implementation :H}iL*  
 protected: VG5+u,U6>  
  HICON m_hIcon; (UkP AE  
  // Generated message map functions >X~B1D,SV7  
  //{{AFX_MSG(CCaptureDlg) (4H\ho8+mp  
  virtual BOOL OnInitDialog(); ;*%rFt9FK  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Tm %5:/<8  
  afx_msg void OnPaint(); 9o@3$  
  afx_msg HCURSOR OnQueryDragIcon(); ]E9iaq6Z  
  virtual void OnCancel(); d) -(C1f  
  afx_msg void OnAbout(); wNa5qp 0  
  afx_msg void OnBrowse(); Ez1eGPVr  
  afx_msg void OnChange(); ,%pCcM)  
 //}}AFX_MSG 8h] TI_  
 DECLARE_MESSAGE_MAP() _c>iux;  
}; eMGJx"a  
#endif >}SEU-7&\  
f3UCELJ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Vgm*5a6t  
#include "stdafx.h" Ejk;(rxI  
#include "Capture.h" Du_5iuMh  
#include "CaptureDlg.h" cAR `{%b  
#include <windowsx.h> .n\JY;"  
#pragma comment(lib,"hook.lib") BJ UG<k  
#ifdef _DEBUG &8IBf8  
#define new DEBUG_NEW fU6YJs.H^8  
#undef THIS_FILE 45~x #Q  
static char THIS_FILE[] = __FILE__; 6Zi{gx  
#endif  +n1!xv]  
#define IDM_SHELL WM_USER+1 IO)Y0J>x  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a_N7X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }geb959  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; x%dny]O1;  
class CAboutDlg : public CDialog w=GMQ8  
{ s^u  Y   
 public: u`|%qRt  
  CAboutDlg(); >axeUd+@i  
  // Dialog Data .IW`?9O$E  
  //{{AFX_DATA(CAboutDlg) 7. F'1oEf  
  enum { IDD = IDD_ABOUTBOX }; qO{z{@jo55  
  //}}AFX_DATA 5>}$]d/o  
  // ClassWizard generated virtual function overrides k9k39`t  
  //{{AFX_VIRTUAL(CAboutDlg) 12 p`ZD=  
 protected: oc1BOW z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *'((_ NZ>  
  //}}AFX_VIRTUAL #-yCR  
  // Implementation 3=enk0$  
 protected:  O3sV)  
  //{{AFX_MSG(CAboutDlg) eiK_JPFA-  
  //}}AFX_MSG _xKn2?d8g  
  DECLARE_MESSAGE_MAP() x^1udK^re  
}; U[wx){[|  
>oW]3)$4S  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) y% bIO6u:  
{ r!R-3LO0s  
 //{{AFX_DATA_INIT(CAboutDlg) bRvGetX  
 //}}AFX_DATA_INIT D4VDWv  
} fJS:46  
ACyK#5E  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) \_Bj"K  
{ `2Pa{g- .  
 CDialog::DoDataExchange(pDX); =RB {.%  
 //{{AFX_DATA_MAP(CAboutDlg)  9q"kM  
 //}}AFX_DATA_MAP (p>|e\(]0  
} 5%}e j)@  
zu d_BOq{f  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) v#,queGi  
 //{{AFX_MSG_MAP(CAboutDlg) +d3|Up8=  
 // No message handlers of B:7  
 //}}AFX_MSG_MAP 9@|52dz%  
END_MESSAGE_MAP() <Y yE1 |  
?X@!jB,Pv  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) PYCN3s#Gi  
: CDialog(CCaptureDlg::IDD, pParent) 1_+ h"LE  
{ 2>o[  
 //{{AFX_DATA_INIT(CCaptureDlg) Tz1^"tx9  
  m_bControl = FALSE; `*s:[k5k  
  m_bAlt = FALSE; -Q20af-  
  m_bShift = FALSE; xO|r<R7d7  
  m_Path = _T("c:\\"); JLu$1A@ '  
  m_Number = _T("0 picture captured."); 5f*_K6,v  
  nCount=0; ]$/oSa/  
  bRegistered=FALSE; nQc,^A)I  
  bTray=FALSE; 3-/|G-4k7  
 //}}AFX_DATA_INIT flCT]ZR  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 pwFdfp  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); JX&U?Z  
} |^Iox0A  
_wKwiJs  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) BA h'H&;V  
{ Ja6KO2}p  
 CDialog::DoDataExchange(pDX); >+{WiZ`  
 //{{AFX_DATA_MAP(CCaptureDlg) .I^4Fc}&4  
  DDX_Control(pDX, IDC_KEY, m_Key); Qj^Uz+b  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); AlQhKL}|s  
  DDX_Check(pDX, IDC_ALT, m_bAlt); _V"0g=&Hc  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); SA<\n+>q^  
  DDX_Text(pDX, IDC_PATH, m_Path); lsax.uG5x  
  DDX_Text(pDX, IDC_NUMBER, m_Number); YdhV a!Y  
 //}}AFX_DATA_MAP AqgY*"A7  
} ':n`0+Eh  
T]\1gs41  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) *'?ZG/ (  
//{{AFX_MSG_MAP(CCaptureDlg) &GLDoLk6[  
 ON_WM_SYSCOMMAND() `jeATxWv  
 ON_WM_PAINT() :Q`Of}#  
 ON_WM_QUERYDRAGICON() M86"J:\u]  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Ll|-CY $  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 4v_Ac;2m&  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 5M>h[Q"R  
//}}AFX_MSG_MAP 9G[ DuYJI  
END_MESSAGE_MAP() d`/8Q9tQ  
K+~?yOQj  
BOOL CCaptureDlg::OnInitDialog() Gi)Vr\Q.  
{ M@T{uo  
 CDialog::OnInitDialog(); )+L|<6JXA  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ]zYIblpde  
 ASSERT(IDM_ABOUTBOX < 0xF000); 7{<v$g$  
 CMenu* pSysMenu = GetSystemMenu(FALSE); [l-o*@  
 if (pSysMenu != NULL) Un]wP`  
 { l9 \W=-'  
  CString strAboutMenu; d}O\:\}y  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Jh.~]\u  
  if (!strAboutMenu.IsEmpty()) .'`aX 7{\  
  { XHA|v^  
   pSysMenu->AppendMenu(MF_SEPARATOR); fnX[R2KZ  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %1 )c{7  
  } L"jA#ULg  
 } $ 5"  
 SetIcon(m_hIcon, TRUE); // Set big icon YXp\C"~g  
 SetIcon(m_hIcon, FALSE); // Set small icon A l;a~45  
 m_Key.SetCurSel(0); Zv}F?4T~:  
 RegisterHotkey(); N)mZ!K44  
 CMenu* pMenu=GetSystemMenu(FALSE); B=]j=\o  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); '=;e# C`<{  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Sqi9'-%m  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); p*PzfSLN  
 return TRUE; // return TRUE unless you set the focus to a control uzxwJs'fz  
} Vja 4WK*  
] !*K|?VL  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Tbm ~@k(C  
{ ~+{*KPiD  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Y-})/zFc  
 { /}1|'?P  
  CAboutDlg dlgAbout; ~0,v Q   
  dlgAbout.DoModal(); #)}BY"C%  
 } `]65&hWZL  
 else !%$[p'  
 { &/[MWQ  
  CDialog::OnSysCommand(nID, lParam); (8 7wWhH  
 } IiniaVuQ  
} s 4rva G@a  
6)sKg{H  
void CCaptureDlg::OnPaint() z$1|D{  
{ @Nb/n  
 if (IsIconic()) `.;U)}Tn  
 { 7[=G;2<  
  CPaintDC dc(this); // device context for painting h<LS`$PK;E  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); !Fs$W  
  // Center icon in client rectangle T[OI/ WuK  
  int cxIcon = GetSystemMetrics(SM_CXICON); s2L]H  
  int cyIcon = GetSystemMetrics(SM_CYICON); V_ (Ly8"1;  
  CRect rect; WCd: (8B  
  GetClientRect(&rect); mKtMI!FR  
  int x = (rect.Width() - cxIcon + 1) / 2; |};d:LwX  
  int y = (rect.Height() - cyIcon + 1) / 2; f~l pa7  
  // Draw the icon e,#w* |  
  dc.DrawIcon(x, y, m_hIcon); \ o2oQ3  
 } Q^<amM!  
 else \V'fB5  
 { j8Mt"B  
  CDialog::OnPaint(); ,L  
 } }{+?>!qDt  
} 8r>\scS  
UQkd$w<  
HCURSOR CCaptureDlg::OnQueryDragIcon() bX[ZVE(L  
{ CV HKP[-  
 return (HCURSOR) m_hIcon; m^BXLG:b  
} gHh (QRA  
vg?(0Gasm*  
void CCaptureDlg::OnCancel() fqbWD)L]  
{ B!<B7Q  
 if(bTray) :BR_%$  
  DeleteIcon(); \aPH_sf,  
  CDialog::OnCancel(); tHaHBx1P  
} DMA7eZf'Hv  
[,st: Y  
void CCaptureDlg::OnAbout() A/9<} m  
{ k2lo GvBJ  
 CAboutDlg dlg; N (\n$bpTt  
 dlg.DoModal(); c{`!$Z'k<  
} PC"=B[OlJ  
dVq9'{[3  
void CCaptureDlg::OnBrowse() ~ecN4Oo4q;  
{ @lM-+q(tl  
 CString str; l %zbx"%x  
 BROWSEINFO bi; x]Nx,tt  
 char name[MAX_PATH]; (' %Y3z;  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ekfa"X_  
 bi.hwndOwner=GetSafeHwnd(); |j/Y#.k;{0  
 bi.pszDisplayName=name; X9c<g;  
 bi.lpszTitle="Select folder"; A'}!'1  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Xa-TNnws?  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); [ZG>FJDl8  
 if(idl==NULL) |61ns6i!  
  return; g~|vmVBua  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); O)R}|  
 str.ReleaseBuffer(); Ymnh%wS  
 m_Path=str; EBWM8~Nm#  
 if(str.GetAt(str.GetLength()-1)!='\\') (VkO[5j  
  m_Path+="\\"; C_ ;nlG6  
 UpdateData(FALSE); X%99@qv  
} O.Te"=^"F  
SG~HzQ\%  
void CCaptureDlg::SaveBmp() 2>.b~q@  
{ ~T9QpL1OJ  
 CDC dc; %H_-`A`  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ' 8R5 Tl  
 CBitmap bm; $B9?>a|{A  
 int Width=GetSystemMetrics(SM_CXSCREEN); PGZe'r1E9  
 int Height=GetSystemMetrics(SM_CYSCREEN); fwx^?/5j  
 bm.CreateCompatibleBitmap(&dc,Width,Height); A3HN Mz  
 CDC tdc; ETX>wZ  
 tdc.CreateCompatibleDC(&dc); s LDEa  
 CBitmap*pOld=tdc.SelectObject(&bm); Vnb@5W2\  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 8.%wnH  
 tdc.SelectObject(pOld); <AJRU l  
 BITMAP btm; Bn.R,B0PL  
 bm.GetBitmap(&btm); M/xm6  
 DWORD size=btm.bmWidthBytes*btm.bmHeight;  MkdC*|  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); #5^OO ou|  
 BITMAPINFOHEADER bih; ncVt (!c,e  
 bih.biBitCount=btm.bmBitsPixel; ~ e<,GUx(]  
 bih.biClrImportant=0; 2t0VbAO 1{  
 bih.biClrUsed=0; !Dc;R+Ir0!  
 bih.biCompression=0; @^# 9N!Fj]  
 bih.biHeight=btm.bmHeight; BTO l`U  
 bih.biPlanes=1; Mx# P >.  
 bih.biSize=sizeof(BITMAPINFOHEADER); Z,-TMtM7  
 bih.biSizeImage=size; "NEKz  
 bih.biWidth=btm.bmWidth; Gw6Od j  
 bih.biXPelsPerMeter=0; t"~X6o|R  
 bih.biYPelsPerMeter=0; 1n*"C!q  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1Qjc*+JzO.  
 static int filecount=0; AjO{c=d  
 CString name; ?!c7Zx,(  
 name.Format("pict%04d.bmp",filecount++); F7=\*U  
 name=m_Path+name; U3M;{_g  
 BITMAPFILEHEADER bfh; n~jW  
 bfh.bfReserved1=bfh.bfReserved2=0; q{[y4c1bG{  
 bfh.bfType=((WORD)('M'<< 8)|'B'); V sL*&Fk  
 bfh.bfSize=54+size; ,Cy&tRjR B  
 bfh.bfOffBits=54; ^4[QX -_2  
 CFile bf; RN&8dsreZp  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ xvWP^Qkb  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); !af;5F  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); <P*7u\9&  
  bf.WriteHuge(lpData,size); R(}!gv}s  
  bf.Close(); fkk9&QB%(  
  nCount++; PKGqu,J,  
 } `$JOFLa  
 GlobalFreePtr(lpData); )wEXCXr!  
 if(nCount==1) >Fe=PRs  
  m_Number.Format("%d picture captured.",nCount); ^Y8G}Z|  
 else _jVJkg)]  
  m_Number.Format("%d pictures captured.",nCount); a6d|Ps.\!  
  UpdateData(FALSE); |^w&dj\,  
} 6hFs{P7  
d%!yFix;<  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) gaU^l73 ,C  
{ XNBzA3W  
 if(pMsg -> message == WM_KEYDOWN) :X1Y  
 { )%: W;H  
  if(pMsg -> wParam == VK_ESCAPE) 0h('@Hb.K#  
   return TRUE;  |>Pv2  
  if(pMsg -> wParam == VK_RETURN) 1bCS4fs^>  
   return TRUE; n*~#]%4  
 } y}W*P#BDO  
 return CDialog::PreTranslateMessage(pMsg); S;{[];  
} K=P LOC5  
V* ,u;*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) L_=3`xE _  
{ Lf Y[Z4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 8nSw7:z  
  SaveBmp(); q}&+{dN\1  
  return FALSE; <1U *{y  
} n8&x=Z}Xs  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;tZ8Sh)  
 CMenu pop; 'f.5hX(Y  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); u/`x@u  
 CMenu*pMenu=pop.GetSubMenu(0); HDhG1B"NL  
 pMenu->SetDefaultItem(ID_EXITICON); <@v|~ AO4~  
 CPoint pt; <FvljKuq+  
 GetCursorPos(&pt); ?&b"/sRS  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 49B6|!&I  
 if(id==ID_EXITICON) G?+]BIiL  
  DeleteIcon(); ksqb& ux6  
 else if(id==ID_EXIT) (=s%>lW|  
  OnCancel(); 9:Z|Z?>?  
 return FALSE; ;:Y/"5h  
} rT{ 2  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); VmTgD96  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) \&s$?r  
 AddIcon(); pf_`{2.\uO  
 return res; 'G3|PA7v  
} DJH,#re>  
`$r?^|T  
void CCaptureDlg::AddIcon() ">R`S<W  
{ '/F~vSQsR  
 NOTIFYICONDATA data; 9/5 EyV  
 data.cbSize=sizeof(NOTIFYICONDATA); JjQTD-^  
 CString tip; HK.Si]:  
 tip.LoadString(IDS_ICONTIP); X^. ~f+d~  
 data.hIcon=GetIcon(0); "(E%JAwZ^W  
 data.hWnd=GetSafeHwnd(); ?D=%k8)Y  
 strcpy(data.szTip,tip); O}[){*GG=  
 data.uCallbackMessage=IDM_SHELL; <Ow+LJWQK  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ^|%7}=e  
 data.uID=98; G4,BcCPQ  
 Shell_NotifyIcon(NIM_ADD,&data); q%Lw#f  
 ShowWindow(SW_HIDE); /C[XC7^4'  
 bTray=TRUE; f.U.(  
} [N*`3UZk"  
L(kW]  
void CCaptureDlg::DeleteIcon() kX'a*AG  
{ ; HjT  
 NOTIFYICONDATA data; \'Ca%j  
 data.cbSize=sizeof(NOTIFYICONDATA); ( z%t  
 data.hWnd=GetSafeHwnd(); ltXGm)+  
 data.uID=98; is=|rY9$  
 Shell_NotifyIcon(NIM_DELETE,&data); VDPq3`$+v{  
 ShowWindow(SW_SHOW); >qynd'eToR  
 SetForegroundWindow();  1O@ cev;  
 ShowWindow(SW_SHOWNORMAL); F#\+.inO  
 bTray=FALSE; %J|xPp)  
} 4fdO Ow  
'5SO3/{b  
void CCaptureDlg::OnChange() )N]%cO(^  
{ =zKbvwe%X  
 RegisterHotkey(); *", BP]]  
} ~Uaz;<"j0  
#.~lt8F  
BOOL CCaptureDlg::RegisterHotkey() kZvh<NFh_  
{ 8]0?mV8iOE  
 UpdateData(); 08E,U  
 UCHAR mask=0; JWs?az  
 UCHAR key=0; fsVr<m  
 if(m_bControl) ),+u>Os&  
  mask|=4; Jl^THoEL  
 if(m_bAlt) }WG -R  
  mask|=2; E 5bo60z  
 if(m_bShift) l j*J|%~  
  mask|=1; s$;IR c5!6  
  key=Key_Table[m_Key.GetCurSel()]; "]{"4qV1=  
 if(bRegistered){ cK+y3`.0  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 7_ah1IEK  
  bRegistered=FALSE; z[ N_3n  
 } "t)|N dZm  
 cMask=mask; yzmwNsu  
 cKey=key; /w*;|4~Bf  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 'P?DZE  
 return bRegistered; w*s#=]6  
} n`)wD~mk  
4 jeUYkJUM  
  四、小结 eFeWjB'<7  
-,#LTW<.  
  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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