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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: ve^gzE$<I  
  NOFuX9/'w  
  一、实现方法 apZPHau6h  
`!Yd$=*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: =z[$ o9  
eI,H  
#pragma data_seg("shareddata") 2{<o1x,Ym  
HHOOK hHook =NULL; //钩子句柄 |8?e4yVd  
UINT nHookCount =0; //挂接的程序数目 l 1vI  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 6u>]-K5  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 +E-CsNAZ*"  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey EhAaaG  
static int KeyCount =0; i2+_~$f  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -G(#,rXk  
#pragma data_seg() V{UY_ e8W  
lokKjs  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 b3Q k;yz  
nh*6`5yj  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ksf6O$  
 ZvwU  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Mj`g84  
cKey,UCHAR cMask) 3,?LpdTS  
{ 3~1Gts  
 BOOL bAdded=FALSE; 54].p7  
 for(int index=0;index<MAX_KEY;index++){ fcO|0cQ  
  if(hCallWnd[index]==0){ M+*K-zt0  
   hCallWnd[index]=hWnd; W*B=j[w  
   HotKey[index]=cKey; 8SA" bH:  
   HotKeyMask[index]=cMask; ?Wc+ J4  
   bAdded=TRUE; [kf6bf@  
   KeyCount++; 9yz@hdG  
   break; ?j&ZzK'#^  
  } 2Z>8ROv^X  
 } Eq|5PE^7  
 return bAdded; }N&? 8s=  
} -Fq`#"  
//删除热键 vi28u xc  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +)LCYDRV7  
{ }U'  
 BOOL bRemoved=FALSE; mLx=Zes:.  
 for(int index=0;index<MAX_KEY;index++){ &\%\"Zh  
  if(hCallWnd[index]==hWnd){ ""A6n{4  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %JgdLnQE  
    hCallWnd[index]=NULL; \)?+6D'#  
    HotKey[index]=0; )-0+O=v  
    HotKeyMask[index]=0; ] n\]ao  
    bRemoved=TRUE; 3N 5@<:2`  
    KeyCount--; }?o4MiLB  
    break; EJ(36h  
   } T%Bz>K  
  } l(W?]{C[%  
 } y^z c @f  
 return bRemoved; QQHQ3 \  
} NcBz("  
4/%Y@Z5  
nRvaCAt^  
  DLL中的钩子函数如下: $6(a6!  
E]v?:!!ds  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) zU0SlRFu  
{ H32o7]lT  
 BOOL bProcessed=FALSE; r.lHlHl  
 if(HC_ACTION==nCode) F 2Y!aR  
 {  S'\e"w  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 % m"Qg<  
   switch(wParam) F]t=5 -O<  
   {  +u&[ j/  
    case VK_MENU: F-$!e?,H  
     MaskBits&=~ALTBIT; s/.P/g%tA>  
     break; wqi0%Cu*  
    case VK_CONTROL: cg o  
     MaskBits&=~CTRLBIT; &>B"/z  
     break; :%Oz:YxC/  
    case VK_SHIFT: e"_kH_7sv  
     MaskBits&=~SHIFTBIT; 8t. QFze?  
     break; Bgn%d4W;G  
    default: //judge the key and send message y$9! rbL  
     break; 3H0B+F2XQ  
   } PfyJJAQ[  
   for(int index=0;index<MAX_KEY;index++){ `lQ;M?D  
    if(hCallWnd[index]==NULL) \Z,{De%  
     continue; <&#MX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k'k}/Hxub  
    { C fM[<w   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); K yyVO"  
     bProcessed=TRUE; _9JFlBx  
    } U1HG{u,"y  
   } D6H?*4f]  
  } $8xb|S[  
  else if((lParam&0xc000ffff)==1){ //有键按下 p_(En4QSH  
   switch(wParam) ]Vmo >  
   { gO)":!_n W  
    case VK_MENU: )$1>6C\  
     MaskBits|=ALTBIT; CJER&"em7  
     break; a+cDH  
    case VK_CONTROL: gb|;]mk*"  
     MaskBits|=CTRLBIT; IxS%V31  
     break; 46pR!k  
    case VK_SHIFT: 7~F~'V  
     MaskBits|=SHIFTBIT; xQ7U$QF|]  
     break; "l9aBBiu  
    default: //judge the key and send message :o .+<_ &  
     break; =JW-EQ6[T  
   } co3\1[q"b  
   for(int index=0;index<MAX_KEY;index++){ ;-XfbqZ\  
    if(hCallWnd[index]==NULL) vzFp Xdt  
     continue; 5A*&!1T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O$}.b=N9  
    { 3 z(4axH'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); S1I.l">P  
     bProcessed=TRUE; k=[s%O 6H  
    } 92t.@!m`  
   } -fl6M-CYX  
  } bc4V&  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ]d-.Mw,'  
   for(int index=0;index<MAX_KEY;index++){ vsZ?cd  
    if(hCallWnd[index]==NULL) }{VOyPG  
     continue; Z.u 1Dz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A+gS'DZ9C  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -F[@)$L  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 QF\nf_X  
   } Ei):\,Nv  
  } Y*PfU +y~  
 } g_`a_0v  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (y 7X1Qc)  
} F-,chp  
BkGEx z  
  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"-#$,@  
IlB8~{p_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); g+4y^x(X@1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P3: t 4^  
<JH,B91  
  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: ?KOw~-u  
giX[2`^NG  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (Jw_2pHxr"  
{ 3,Yr%`/5'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Jp_#pV*}:  
 { {\(MMTQ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 @$T$hMl  
  SaveBmp(); $q)YC.5$  
  return FALSE; 4minzrKM\  
 } z&tC5]#  
 …… //其它处理及默认处理 @;tfHoXD  
} sHc-xnd  
(X,i,qK/  
%&yPl{  
  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。 )\=xPfs  
{V2"Pym?  
  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。 *H/3xPh,*  
y'`/^>.  
  二、编程步骤 ft6)n T/"&  
8zD>t~N2C  
  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"; xF8n=Lc  
cQyN@W  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 0^gY4qx[u  
1wKXOy=v0  
  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.F&gP)9  
rBNVI;JZW  
  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; 8ROKfPj;z  
p8_^6wfg  
  5、 添加代码,编译运行程序。 )ZpI%M?)  
tLTavE[@  
三、程序代码 3WJk04r  
=+Fb\HvX{  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL @m9pb+=v  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) q\?s<l63  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ > 0MP[  
#if _MSC_VER > 1000 $TXxhd 6  
#pragma once ovTL'j!  
#endif // _MSC_VER > 1000 QMsq4yJ)%  
#ifndef __AFXWIN_H__ fUkqhqe  
#error include 'stdafx.h' before including this file for PCH L^ J|cgmNw  
#endif w3(|A> s3  
#include "resource.h" // main symbols >bh+!5Y0  
class CHookApp : public CWinApp ],pB:=  
{ su1lv#  
 public: p)yP_P  
  CHookApp(); q2vD)r  
  // Overrides j#n ]q{s4  
  // ClassWizard generated virtual function overrides {,Q )D$i  
  //{{AFX_VIRTUAL(CHookApp) P3&s<mh  
 public: ORs :S$Nt$  
  virtual BOOL InitInstance(); u^tQ2&?O!P  
  virtual int ExitInstance(); Ig `q[o  
  //}}AFX_VIRTUAL -[L\:'Gp5  
  //{{AFX_MSG(CHookApp) E]OexRJ^i  
  // NOTE - the ClassWizard will add and remove member functions here. /'rj L<M  
  // DO NOT EDIT what you see in these blocks of generated code ! N|DI k  
  //}}AFX_MSG qY#*LqV  
  DECLARE_MESSAGE_MAP() Qh1pX}X  
}; FBNLszT{L  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 9{jMO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0\tac/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); AygdAg'\  
BOOL InitHotkey(); 0Idek  
BOOL UnInit(); ]`&_!T  
#endif ?ZlXh51  
})/P[^  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Yub}AuU`v  
#include "stdafx.h" 5qtk#FB  
#include "hook.h"  j%Au0k  
#include <windowsx.h> .[O{,r  
#ifdef _DEBUG lPR=C0h}@  
#define new DEBUG_NEW gT+g@\u[  
#undef THIS_FILE a|7C6#iz$  
static char THIS_FILE[] = __FILE__; /:4J  
#endif L/tpT?$fi  
#define MAX_KEY 100 ?$f.[;mh  
#define CTRLBIT 0x04 73cb1 kfPd  
#define ALTBIT 0x02 Trv}YT.  
#define SHIFTBIT 0x01 AOR?2u  
#pragma data_seg("shareddata") i< ^X z  
HHOOK hHook =NULL; xSmG,}3mF  
UINT nHookCount =0; k4K. ml IO  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey rFg$7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT o72r `2  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey -qIi.]/f"9  
static int KeyCount =0; Zd[rn:9\  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift XjGS.&'I  
#pragma data_seg() k<<x}=  
HINSTANCE hins; VhUWws3E  
void VerifyWindow(); U#[&(  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 1!v{#w{u7  
//{{AFX_MSG_MAP(CHookApp) S; % &X  
// NOTE - the ClassWizard will add and remove mapping macros here. ,<Q  
// DO NOT EDIT what you see in these blocks of generated code! <a6pjx>y  
//}}AFX_MSG_MAP 6nW)2LV  
END_MESSAGE_MAP() zr.\7\v  
6<];}M_{  
CHookApp::CHookApp() H0afu)$,  
{ ~XTC:6ts  
 // TODO: add construction code here, 0~qc,-)3  
 // Place all significant initialization in InitInstance /mex{+p>tO  
} > <YU'>%  
@|b-X? `  
CHookApp theApp; eP-|3$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9&Jf4lC94  
{ `}Zqmfs  
 BOOL bProcessed=FALSE; xS,24{-HJ  
 if(HC_ACTION==nCode) QRQZ{m  
 { 6m:$mhA5  
  if((lParam&0xc0000000)==0xc0000000){// Key up GmH DG-  
   switch(wParam) =0ZRG p  
   { !?P8[K  
    case VK_MENU: Nm?^cR5r  
     MaskBits&=~ALTBIT; dR S:S_  
     break; |4df)  
    case VK_CONTROL: 3a?-UT!  
     MaskBits&=~CTRLBIT; QHR,p/p  
     break; w|9 >4  
    case VK_SHIFT: "2cOSPpQL  
     MaskBits&=~SHIFTBIT; 8fXiadP#  
     break; !Y~UO)u2  
    default: //judge the key and send message Dkz/hg:q  
     break; YRu@; `  
   } yvYMk(LSF  
   for(int index=0;index<MAX_KEY;index++){ f% pT-#  
    if(hCallWnd[index]==NULL) B0@ Tz39=  
     continue; e|]e\Or>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a^ %iAe  
    { pm6#azQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); p) 8S]p]  
     bProcessed=TRUE; o$No@~%v  
    } 1h$?,  
   } 8o~ NJ 6  
  } l_h:S`z.  
  else if((lParam&0xc000ffff)==1){ //Key down :ppaq  
   switch(wParam) I&1Lm)W&  
   { lfgJQzi G  
    case VK_MENU: lz,M$HG<[  
     MaskBits|=ALTBIT; RA0;f'"`  
     break; ) D@j6r  
    case VK_CONTROL: h&>3;Lj  
     MaskBits|=CTRLBIT; cb}zCl j o  
     break; (;{X-c}?  
    case VK_SHIFT: _SBbd9  
     MaskBits|=SHIFTBIT; X8)k'h  
     break; s)1-xA{'.  
    default: //judge the key and send message =)Xj[NNRT  
     break; = lo.LFV  
   } 6("_}9ZOc  
   for(int index=0;index<MAX_KEY;index++) `Lr], >aG  
   { /|?$C7%a\D  
    if(hCallWnd[index]==NULL) up5f]:!  
     continue; A=<7*E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2HeX( rB  
    { o2!738  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); T9nb ~ P[  
     bProcessed=TRUE; ? :H+j6+f  
    } h4;kjr}h}  
   } jK w 96  
  } FNQ<k[#K'~  
  if(!bProcessed){ ,2FK$: M\  
   for(int index=0;index<MAX_KEY;index++){ b80#75Bj>  
    if(hCallWnd[index]==NULL) |}=eY?iXo  
     continue; "_WN[jm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #3&@FzD_P  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =CLPz8  
   } "hk# pQ  
  } :K| H/kht  
 } !&:=sA  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); m}"Hm(,6  
} eEZgG=s  
oIhKMQ;jh  
BOOL InitHotkey() vIV|y>;g  
{ ,Z{\YAh1  
 if(hHook!=NULL){ 8b/$Qp4d  
  nHookCount++; $bTtD<a  
  return TRUE; 37hdZt.,  
 } _T\~%  
 else (nqry[g&  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); *ID=X!v  
  if(hHook!=NULL) 94tfR$W;-  
   nHookCount++; ]\pi!oa  
  return (hHook!=NULL); rFXdxRP;M  
} _p )NZ7yC  
BOOL UnInit() y'2|E+*V  
{ @v)Z>xv  
 if(nHookCount>1){ Gx C+lqH#  
  nHookCount--; [^hW>O=@TN  
  return TRUE; y7HFmGM  
 } x%mRDm~-  
 BOOL unhooked = UnhookWindowsHookEx(hHook); (y9KO56.V&  
 if(unhooked==TRUE){ dFz"wvu` o  
  nHookCount=0; 6GxLaI  
  hHook=NULL; &S>{9 y%  
 } FV^jCseZ  
 return unhooked; 6`e{l+c=F  
} _b&|0j:Ud  
~,)jZ-fw  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6W i n!4  
{ DDrR9}k  
 BOOL bAdded=FALSE; iH(7.?.r  
 for(int index=0;index<MAX_KEY;index++){ qAjtvc2  
  if(hCallWnd[index]==0){ \J^#2{d  
   hCallWnd[index]=hWnd; >=@-]X2%j  
   HotKey[index]=cKey; 2`=jKt  
   HotKeyMask[index]=cMask; z D{]3pg  
   bAdded=TRUE; 4(L mjue]?  
   KeyCount++; si0}b~t  
   break; wps/{h,  
  } 7#LIGr  
 } x3O%W?5  
 return bAdded; *6}M.`.-  
} rS1gFGrj  
#NM)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U)(R4Y6 v  
{ jq~`rE h9  
 BOOL bRemoved=FALSE; Rta}*  
 for(int index=0;index<MAX_KEY;index++){ Nv5^2^Sc=  
  if(hCallWnd[index]==hWnd){ 'cO8& |  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p(F@lL-  
    hCallWnd[index]=NULL; p4VARAqi  
    HotKey[index]=0; I*rUe#$  
    HotKeyMask[index]=0; kvbZx{s  
    bRemoved=TRUE; <pX?x3-'  
    KeyCount--; rL5=8l  
    break; ^Om}9rXw1  
   } L( 6b2{"  
  } yT^2;/Z  
 } )qxt<  
 return bRemoved; _U~R   
} %2 r ~  
Z ]A |"6<  
void VerifyWindow() XM]m%I  
{ t&U9Z$LS  
 for(int i=0;i<MAX_KEY;i++){ d.&_j`\F  
  if(hCallWnd!=NULL){ =R5W KX  
   if(!IsWindow(hCallWnd)){ yY$^ R|t  
    hCallWnd=NULL; | Y:`>2ev  
    HotKey=0; UQ0!tFx  
    HotKeyMask=0; !Rv ;~f/2  
    KeyCount--; 5IU!BQU  
   } //@6w;P  
  } ";/]rwHa)  
 } }c,b]!:  
} TEV DES  
#0AyC.\  
BOOL CHookApp::InitInstance() lelmX  
{ T}Tv}~!f  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ucl001EK  
 hins=AfxGetInstanceHandle(); x;vfmgty  
 InitHotkey(); $0Y`> 3  
 return CWinApp::InitInstance(); 971=OEyq*  
} \,;glY=M!  
NO5k1/-  
int CHookApp::ExitInstance() n.+*_c8k  
{ @<W` w  
 VerifyWindow(); Iy)1(upM  
 UnInit(); Jh+;+"  
 return CWinApp::ExitInstance(); 24wDnDyh  
} pm O9mWq   
I9kz)Q o  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {a[BhK'g  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) TuwP'g[  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 'n|U   
#if _MSC_VER > 1000 Y}[<KK}_  
#pragma once e'mF1al  
#endif // _MSC_VER > 1000 vP{i+s18B  
u|<?m A!  
class CCaptureDlg : public CDialog JC'3x9_<z  
{ SQ) BS/8A  
 // Construction ;lmg0dtJ  
 public: m=}h7&5p  
  BOOL bTray; <EC"E #p  
  BOOL bRegistered; aImzK/  
  BOOL RegisterHotkey(); )"TVR{I%B  
  UCHAR cKey; {C w.?JU  
  UCHAR cMask; %M x|"ff  
  void DeleteIcon(); Jt$YSp=!!  
  void AddIcon(); &g?GF\Y  
  UINT nCount; g1t6XVS$9  
  void SaveBmp(); L@Rgiq|v-|  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor qT?{}I  
  // Dialog Data P(PBOB97  
  //{{AFX_DATA(CCaptureDlg) x(c+~4:_M  
  enum { IDD = IDD_CAPTURE_DIALOG }; SGKAx<U  
  CComboBox m_Key; &YIL As^8A  
  BOOL m_bControl;  %lj5Olj  
  BOOL m_bAlt; s_ZPo6p  
  BOOL m_bShift; ~ZafTCa;  
  CString m_Path; wH"9N+82M  
  CString m_Number; 8L[+$g`  
  //}}AFX_DATA yu_PZ"l  
  // ClassWizard generated virtual function overrides E$%v);u  
  //{{AFX_VIRTUAL(CCaptureDlg) /Am9w$_T[  
 public: rl.K{Uad  
  virtual BOOL PreTranslateMessage(MSG* pMsg); | V(sCF  
 protected: M8H hjoo  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 59nRk}^$se  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ]*NYuEgc  
  //}}AFX_VIRTUAL i&DbZ=n2  
  // Implementation 72$S'O%,0  
 protected: 1V,@uY)s  
  HICON m_hIcon; .]>Tj^1  
  // Generated message map functions 7#JnQ| ]  
  //{{AFX_MSG(CCaptureDlg) #JYl%=#,  
  virtual BOOL OnInitDialog(); @>2]zMFf  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {^oohW -  
  afx_msg void OnPaint(); "e-z 2G@z  
  afx_msg HCURSOR OnQueryDragIcon(); knO X5UnS  
  virtual void OnCancel(); co,0@.i  
  afx_msg void OnAbout();  ];5J  
  afx_msg void OnBrowse(); mX|M]^_,z  
  afx_msg void OnChange(); B2r[oT R  
 //}}AFX_MSG +kWWx#L#  
 DECLARE_MESSAGE_MAP() EUSM4djL  
}; "nr?WcA  
#endif xn, u$@F  
<?A4/18K  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 7fq Q  
#include "stdafx.h" <^nS%hXEr  
#include "Capture.h" Q7y' 0s  
#include "CaptureDlg.h" '$,yV f  
#include <windowsx.h> KY&Lv^1_|  
#pragma comment(lib,"hook.lib") |}{gE=]  
#ifdef _DEBUG POk5+^  
#define new DEBUG_NEW =.s0"[%   
#undef THIS_FILE pwMA,X/{  
static char THIS_FILE[] = __FILE__; cPcH 8Vd  
#endif <Ve0PhK  
#define IDM_SHELL WM_USER+1 /@ em E0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W(s5mX,Kv  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1*A^v  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; bF9.k  
class CAboutDlg : public CDialog &Sb)a  
{ bR3Crz(9G  
 public: i).Vu}W#S  
  CAboutDlg(); x((u  
  // Dialog Data #;99vwc  
  //{{AFX_DATA(CAboutDlg) gy?uk~p  
  enum { IDD = IDD_ABOUTBOX }; F7' MoH  
  //}}AFX_DATA {zZ)JWM<w  
  // ClassWizard generated virtual function overrides = V')}f~C  
  //{{AFX_VIRTUAL(CAboutDlg) '-myOM7  
 protected: 6}Y==GP t  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [!U%''  
  //}}AFX_VIRTUAL -f?  
  // Implementation n U=  
 protected: Lvt3S .l  
  //{{AFX_MSG(CAboutDlg) ok6t| 7sq  
  //}}AFX_MSG Gt{%O>P8t  
  DECLARE_MESSAGE_MAP() {_tq6ja-<  
}; 0J?443A Y  
6`-<N!  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Yv=L'0K&  
{ :UT \L2 q=  
 //{{AFX_DATA_INIT(CAboutDlg) Qz=e'H  
 //}}AFX_DATA_INIT q-CgX wU  
} (<B%Gy@  
WS6Qp`c )e  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) PkFG0  
{ H3!9H  
 CDialog::DoDataExchange(pDX); K 91O$'J  
 //{{AFX_DATA_MAP(CAboutDlg) Y*b$^C%2  
 //}}AFX_DATA_MAP #[i3cn  
} nKd'5f1  
.Ao _c x  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?6"U('y>n  
 //{{AFX_MSG_MAP(CAboutDlg) R{[v#sF >#  
 // No message handlers "KF]s.  
 //}}AFX_MSG_MAP c)Ng9p  
END_MESSAGE_MAP() S*n5d>;  
3 }sy{Mx%9  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) fP 3eR>e  
: CDialog(CCaptureDlg::IDD, pParent) ]Ky`AG`2~  
{  N MkOx$  
 //{{AFX_DATA_INIT(CCaptureDlg) VN09g&  
  m_bControl = FALSE; }@.@k6`n  
  m_bAlt = FALSE; (mbm',%-(  
  m_bShift = FALSE; Dy5&-yk  
  m_Path = _T("c:\\"); jHob{3  
  m_Number = _T("0 picture captured."); Mi NEf  
  nCount=0; ouyZh0 G  
  bRegistered=FALSE; 'h;qI&  
  bTray=FALSE; .5>]DZn6  
 //}}AFX_DATA_INIT )" Z|x  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ^7Z? }tgU  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); )Pubur %,  
} oNYFbZw  
Vo[.^0  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) cSv;HN:  
{ B*)mHSs2  
 CDialog::DoDataExchange(pDX); H/*slqL  
 //{{AFX_DATA_MAP(CCaptureDlg) Hi2JG{i  
  DDX_Control(pDX, IDC_KEY, m_Key); @/N]_2@8;  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 14l6|a  
  DDX_Check(pDX, IDC_ALT, m_bAlt); mz x$(u  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); #lik: ?  
  DDX_Text(pDX, IDC_PATH, m_Path); :RDk{^b)  
  DDX_Text(pDX, IDC_NUMBER, m_Number); p<pGqW  
 //}}AFX_DATA_MAP bz 7?F!  
} OZz/ip-!lc  
Zcw <USF8  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) fHwS12SB  
//{{AFX_MSG_MAP(CCaptureDlg) OK-*TPrc  
 ON_WM_SYSCOMMAND() 5{!"}  
 ON_WM_PAINT() YHY*dk*|C  
 ON_WM_QUERYDRAGICON() yzl}!& E  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) )b%zYD9p  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) mQt0?c _  
 ON_BN_CLICKED(ID_CHANGE, OnChange) PB*G#2W  
//}}AFX_MSG_MAP toU<InN  
END_MESSAGE_MAP() EqBTN07dZS  
v.sjWF  
BOOL CCaptureDlg::OnInitDialog() <3ep5`1   
{ I d8MXdV  
 CDialog::OnInitDialog(); w87$p821  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); H}&JrT95  
 ASSERT(IDM_ABOUTBOX < 0xF000); "Q\b6 7Ch  
 CMenu* pSysMenu = GetSystemMenu(FALSE); wmX(%5vY^  
 if (pSysMenu != NULL) ,jW a&7  
 { }4piZ ch  
  CString strAboutMenu; DTsD<o  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?b}e0C-a  
  if (!strAboutMenu.IsEmpty()) 3&"uf9d  
  { 9:3`LY3wW  
   pSysMenu->AppendMenu(MF_SEPARATOR); ew,okRCN  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); UHk)!P>  
  } cM,g, E}  
 }  `2\:b^h  
 SetIcon(m_hIcon, TRUE); // Set big icon 4M0p:Ey '  
 SetIcon(m_hIcon, FALSE); // Set small icon ?MfwRWY  
 m_Key.SetCurSel(0); ![4_K':=  
 RegisterHotkey(); OaT]2o  
 CMenu* pMenu=GetSystemMenu(FALSE); }fef*>>}  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); X>pCkGE  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); "1>w\21  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 'n"we# [  
 return TRUE; // return TRUE unless you set the focus to a control =j20A6gND  
} {~#PM>f  
hpbi!g  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) WAtv4  
{ 3A =\Mb  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) .h/2-pQ>  
 { owyQFk  
  CAboutDlg dlgAbout; zmu+un"\j  
  dlgAbout.DoModal(); WuI$   
 }  JJs*2y  
 else egr"og{  
 { ?|_i"*]l  
  CDialog::OnSysCommand(nID, lParam); oLq N  
 } g-ZXj4Ph!  
} lu+KfKa  
j B1ZF#  
void CCaptureDlg::OnPaint() Yi[MoYe/K  
{ rf`xY4I\  
 if (IsIconic()) >Y\?v-^~;  
 { OwNo$b]h`  
  CPaintDC dc(this); // device context for painting @.)[U:N  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); xzFQ)t&  
  // Center icon in client rectangle Vo.~1^  
  int cxIcon = GetSystemMetrics(SM_CXICON); fo~*Bp()-E  
  int cyIcon = GetSystemMetrics(SM_CYICON); 9@mvG^  
  CRect rect; +!:=Mm  
  GetClientRect(&rect); UUvCi+W  
  int x = (rect.Width() - cxIcon + 1) / 2; bVa?yWb.  
  int y = (rect.Height() - cyIcon + 1) / 2; .kkhW8:  
  // Draw the icon 6]?W&r|0I  
  dc.DrawIcon(x, y, m_hIcon); KW ZEi?  
 } =\MAz[IDj  
 else mQSn*;9\T3  
 { )%kiM<})  
  CDialog::OnPaint(); d0Ubt  
 } M} ri>o  
} O'@[ f{  
mC-wPi8  
HCURSOR CCaptureDlg::OnQueryDragIcon() @Cx goX^  
{ LylCr{s7  
 return (HCURSOR) m_hIcon; Xx2t0AIB  
} !)`*e>]x  
D6fd(=t1Z  
void CCaptureDlg::OnCancel() 'qG-)2 t  
{ ox\D04:M  
 if(bTray) o=Mm=;H  
  DeleteIcon(); \P"Ol\@  
  CDialog::OnCancel(); y!rJ}e  
} darbL_1  
w8:  
void CCaptureDlg::OnAbout() 5'V-Ly)*%  
{ \Mdi eO*  
 CAboutDlg dlg; <Ter\o5%  
 dlg.DoModal(); %.'oY%  
} 9:=:P>  
je3Qq1  
void CCaptureDlg::OnBrowse() tJ8:S@E3,  
{ $b7@S`5  
 CString str; })?-)fFD  
 BROWSEINFO bi; f#7=N{wm  
 char name[MAX_PATH]; S,avvY.U\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); GDiyFTr  
 bi.hwndOwner=GetSafeHwnd(); ,Jn` qvmi  
 bi.pszDisplayName=name; 4M6[5RAW{  
 bi.lpszTitle="Select folder"; 9`"#OQPn1  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; F ~7TE91C  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 5DkEJk7a  
 if(idl==NULL) AGO"),  
  return; V,8Z!.MG  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :>_oOn[_  
 str.ReleaseBuffer(); *DZ7,$LQ~D  
 m_Path=str; [7LdTY"Tl  
 if(str.GetAt(str.GetLength()-1)!='\\') D,lY_6=  
  m_Path+="\\"; 5Fj9.K~k  
 UpdateData(FALSE); Dbq/t^  
} F0r2=f(?  
X8R:9q_  
void CCaptureDlg::SaveBmp() 59"tHb6E  
{ 7|_2@4-W6  
 CDC dc; 3-1a+7fD  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); .j>MsQP#\C  
 CBitmap bm; rO{?.#~  
 int Width=GetSystemMetrics(SM_CXSCREEN); 8Z "f"  
 int Height=GetSystemMetrics(SM_CYSCREEN); v9KsE2Ei  
 bm.CreateCompatibleBitmap(&dc,Width,Height); P &@,Z# \  
 CDC tdc; 8K8jz9.s  
 tdc.CreateCompatibleDC(&dc); cnw+^8  
 CBitmap*pOld=tdc.SelectObject(&bm); ?Pf#~U_  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); c9c3o{(6Y  
 tdc.SelectObject(pOld); "!eq~/nk  
 BITMAP btm; `CBXz!v!O  
 bm.GetBitmap(&btm); o61rTj  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; fgC@(dvfk  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); :qj;f];|  
 BITMAPINFOHEADER bih; YTTi j|(  
 bih.biBitCount=btm.bmBitsPixel; G-R83Orl  
 bih.biClrImportant=0; bu $u@:q 6  
 bih.biClrUsed=0; <r>Sj /w<D  
 bih.biCompression=0; BSJS4+,E  
 bih.biHeight=btm.bmHeight; Dfc% jWbA  
 bih.biPlanes=1; GK3T w  
 bih.biSize=sizeof(BITMAPINFOHEADER); kg7 bZ  
 bih.biSizeImage=size;  '.>y'=  
 bih.biWidth=btm.bmWidth; gN7 3)uJ0  
 bih.biXPelsPerMeter=0; D`'Cnt/  
 bih.biYPelsPerMeter=0; qK2jJ3)>  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); YU)%-V\  
 static int filecount=0; G]EI!-y  
 CString name; 0S'@(p[A  
 name.Format("pict%04d.bmp",filecount++); sX3qrRY  
 name=m_Path+name; L$+_  
 BITMAPFILEHEADER bfh; ;O{bF8 U  
 bfh.bfReserved1=bfh.bfReserved2=0; ~ISY( &  
 bfh.bfType=((WORD)('M'<< 8)|'B'); :xbj& l  
 bfh.bfSize=54+size; =YfzB!ld  
 bfh.bfOffBits=54; j(K)CHH  
 CFile bf; (\r^ 0>H  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /0fHkj/J=B  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); L%<]gJtrO  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ZJF+./vN  
  bf.WriteHuge(lpData,size); mE>{K  
  bf.Close(); Tr|PR t  
  nCount++; HVhd#Q;  
 } UugR  
 GlobalFreePtr(lpData); BSB&zp  
 if(nCount==1) q bCU&G|)  
  m_Number.Format("%d picture captured.",nCount); f1elzANy  
 else PlK3;  
  m_Number.Format("%d pictures captured.",nCount); 7zA+UWr  
  UpdateData(FALSE); [u^ fy<jdp  
} {.[EXMX  
G -K{  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) mh`uvqY  
{ ur=:Ha  
 if(pMsg -> message == WM_KEYDOWN) mW+5I-~  
 { 0 z]H=  
  if(pMsg -> wParam == VK_ESCAPE) J P5en  
   return TRUE; UIg?3J}R  
  if(pMsg -> wParam == VK_RETURN) KsK]y,^Z  
   return TRUE; bmi",UZ:F  
 } yHlQKI  
 return CDialog::PreTranslateMessage(pMsg); 11Qi _T\  
} aJF/y3  
9ZatlI,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) v6[VdWOx5  
{ G51-CLM,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 7/k7V)  
  SaveBmp(); /"m#mh L  
  return FALSE; %hw4IcWJ|  
} & ,:!gYN  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ zxD=q5in  
 CMenu pop; *//z$la  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); `kv7Rr}Q  
 CMenu*pMenu=pop.GetSubMenu(0); SDNRcSbOD6  
 pMenu->SetDefaultItem(ID_EXITICON); XP:fL NpQ  
 CPoint pt; 55UPd#E'  
 GetCursorPos(&pt); C!9mygI  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); #w\x-i|  
 if(id==ID_EXITICON) >9i>A:  
  DeleteIcon(); 5[r}'08b  
 else if(id==ID_EXIT) }LQV2 hKTG  
  OnCancel(); &)JoB  
 return FALSE; vWrTB   
} ?EPHq, E  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); WS(m#WFQr  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) f8=qnY2j  
 AddIcon(); G(Hr*T%  
 return res; v.vkQQ0[9  
} 7+@-mJMP$D  
m .(\u?J  
void CCaptureDlg::AddIcon() 1OMaY5F  
{ h&v].l  
 NOTIFYICONDATA data; 2_o\Wor#  
 data.cbSize=sizeof(NOTIFYICONDATA); 9) $[W  
 CString tip; U:eX^LE7  
 tip.LoadString(IDS_ICONTIP); Q=vo5)t   
 data.hIcon=GetIcon(0); br 3-.g  
 data.hWnd=GetSafeHwnd(); ycki0&n3  
 strcpy(data.szTip,tip); ,`!lZ| U  
 data.uCallbackMessage=IDM_SHELL; P$N5j~*  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; @qjN>PH~  
 data.uID=98; c;-N RvVb  
 Shell_NotifyIcon(NIM_ADD,&data); *B{]  
 ShowWindow(SW_HIDE); 0T#z"l<L  
 bTray=TRUE; ,_w}\'?L  
} ?u".*!%  
f8qDmk5s  
void CCaptureDlg::DeleteIcon() y;4g>ma0  
{ 3 Fy C D4#  
 NOTIFYICONDATA data; H.C*IL9  
 data.cbSize=sizeof(NOTIFYICONDATA); +Zr~mwM=x  
 data.hWnd=GetSafeHwnd(); gW4fwE^  
 data.uID=98; nhC8Tq[m  
 Shell_NotifyIcon(NIM_DELETE,&data); f<nK;  
 ShowWindow(SW_SHOW); =3SJl1w1  
 SetForegroundWindow(); HkhZB^_V  
 ShowWindow(SW_SHOWNORMAL); PNo:vRtsq  
 bTray=FALSE; Y}s6__  
} ,L~aa?Nb-  
8y_(Iu|:  
void CCaptureDlg::OnChange() r|\{!;7  
{ -e_TJA  
 RegisterHotkey(); =5fY3%^b{  
} 7IkEud  
ht>/7.p]  
BOOL CCaptureDlg::RegisterHotkey() x>BFK@#  
{ )b=vBs`%  
 UpdateData(); K7(k_4  
 UCHAR mask=0; >hq{:m  
 UCHAR key=0; O'#;Ge/,  
 if(m_bControl) j%Z5[{!/,X  
  mask|=4; ,,80nW9E  
 if(m_bAlt) LikCIO  
  mask|=2; matm>3n  
 if(m_bShift) Z1+Ewq3m  
  mask|=1; O{7#Xj :_  
  key=Key_Table[m_Key.GetCurSel()]; 3vAP&i'I  
 if(bRegistered){ <gH-`3 J6  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 0pW;H|h  
  bRegistered=FALSE; S Te8*=w  
 }  F0zaA  
 cMask=mask; YPq:z"`-y4  
 cKey=key; M2d&7>N  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); qTwl\dcncC  
 return bRegistered; n@"<NKzh  
} mvt-+K?U  
_LfbEv<,T  
  四、小结 9,\AAISi  
q+<,FdG  
  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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