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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: Sd IX-k.  
  Fv?=Z-wk  
  一、实现方法 j%<}jw[2  
6AN)vs}  
  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: yB LUNIr  
}<MR`h1  
#pragma data_seg("shareddata") +:6Ii9G N  
HHOOK hHook =NULL; //钩子句柄 &X`u9 V  
UINT nHookCount =0; //挂接的程序数目 5j"1z1_&  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 6@tvRDeaDW  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Ni*Wz*o  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey IfDx@?OB  
static int KeyCount =0; 4c~>ci,N?(  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Bn]K+h\E  
#pragma data_seg() 5 / m$)wE  
Uz%Z&K  
  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。 $R8w+ Id  
^TXfsQs  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: -Uo?WXP]B'  
o@lWBfB*%e  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 5 waw`F  
cKey,UCHAR cMask) ,]Zp+>{  
{ }8'&r(cN4  
 BOOL bAdded=FALSE; >+cVs:  
 for(int index=0;index<MAX_KEY;index++){ <Wl(9$  
  if(hCallWnd[index]==0){ ^_p%Yv  
   hCallWnd[index]=hWnd; d0 er^ ~  
   HotKey[index]=cKey; %up}p/?  
   HotKeyMask[index]=cMask; __p_8P  
   bAdded=TRUE; V'Qn sI  
   KeyCount++; $e\N+~KNCy  
   break; %@ mGK8  
  } kvsA]tK.  
 } # Oup^ o@  
 return bAdded; AyE\fY5  
} `PI(%N  
//删除热键 XeUC0K[D  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) TUp%FJXA|  
{ 3Rl,GWK  
 BOOL bRemoved=FALSE; Q |i9aE  
 for(int index=0;index<MAX_KEY;index++){ Q"J-tP!  
  if(hCallWnd[index]==hWnd){ KA]*ox6j;  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ yno('1B@  
    hCallWnd[index]=NULL; E@QA".  
    HotKey[index]=0; 6k])KlJ2;  
    HotKeyMask[index]=0; 4ax|Vb)D  
    bRemoved=TRUE; T bE:||r?^  
    KeyCount--; w,.qCpT$_  
    break; ySdN;d:q  
   } #Gv{UU$]  
  } fW0$s`  
 } wpPn}[a  
 return bRemoved; 83 ]PA<R  
} 'bW5Fr>W  
]]iO- }  
qFR dg V>8  
  DLL中的钩子函数如下: 96|[}:+$&:  
y@vj;3:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 2%rLoL$Y2+  
{ j033%p+Xc  
 BOOL bProcessed=FALSE; B(HT.%r^A  
 if(HC_ACTION==nCode) <"&'>?8j  
 { BQgoVnQo_c  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 oJ;rc{n-  
   switch(wParam) 0.(<'!"y  
   {  7h<> k*E)  
    case VK_MENU: T|'&K:[TJ  
     MaskBits&=~ALTBIT; &d$~6'x*  
     break; "-i#BjZl/  
    case VK_CONTROL: yFIIX=NC  
     MaskBits&=~CTRLBIT; 5vZ#b\;#V  
     break; EO"C8z'al  
    case VK_SHIFT: p6 xPheD  
     MaskBits&=~SHIFTBIT; ?F$6;N6x  
     break; BD;H   
    default: //judge the key and send message /NBTvTI  
     break; H30OUrD  
   } @Jv# fr  
   for(int index=0;index<MAX_KEY;index++){ #V 43=  
    if(hCallWnd[index]==NULL) gT1P*N;v  
     continue; Q .RO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) jMpa?Jp1  
    { SN]LeXesS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #1Z7&#R/  
     bProcessed=TRUE; -l*A  
    } `<vxG4=62\  
   } we]>(|  
  } o42`z>~  
  else if((lParam&0xc000ffff)==1){ //有键按下 H7IW"UkBR  
   switch(wParam) {7#03k  
   { x*8O*!ZZ  
    case VK_MENU: h W.2p+  
     MaskBits|=ALTBIT; C|e+0aW  
     break; `1'5j "v  
    case VK_CONTROL: Lar r}o=  
     MaskBits|=CTRLBIT; ^Vo"fI`=C  
     break; 12gw#J/)9h  
    case VK_SHIFT: W,NL*($^  
     MaskBits|=SHIFTBIT; emWGIo  
     break; q.oLmX  
    default: //judge the key and send message @FX{M..  
     break; @phN|;?  
   } pieT'mA  
   for(int index=0;index<MAX_KEY;index++){ L$JI43HZ  
    if(hCallWnd[index]==NULL) .9 kyrlm  
     continue; Ph)| j&]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6v47 QW|'  
    { O-GxUHwW r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); __)qw#  
     bProcessed=TRUE; nm):SEkC  
    } YOw?'+8  
   } :EB,{|m  
  } "3y}F  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 k,_i#9 X  
   for(int index=0;index<MAX_KEY;index++){ `jW 4H$D  
    if(hCallWnd[index]==NULL) :WX0,-Gn  
     continue; !C`20,U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +i)AS0?d  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); nPf'ee  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ,f<B}O  
   } euZ(}+N&  
  } ?`. XK}  
 } zD_H yGf  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); =~,l4g\  
} n6cq\@~A  
5faj;I{%JY  
  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: ZLJNw0!=|t  
pG28M]\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JK^[{1 JI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Kq7C0)23  
22vq=RO7Z  
  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: 4K,''7N3  
#WEq-0L   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) qy9i9$8  
{ tR O IBq|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) SsRVd^=;x  
 { JN^bo(kb  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 k/^g*  
  SaveBmp(); j |td,82.  
  return FALSE; 5B|,S1b  
 } \3j)>u,r  
 …… //其它处理及默认处理 3U o]> BG  
} jZ#UUnR%  
#Q+R%p  
0x#E4v (UA  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 5mIXyg 0:  
\\s?B K  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 vzy!3Hiw  
@YB85p"]J.  
  二、编程步骤 R-C5*$  
`,m7xJZ?y  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; E0jUewG  
;+9(;  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; EE9vk*[@C  
K P6PQgc  
  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; LaT8l?q q  
v>:=w|.HC  
  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; ?%;B`2 nDR  
L5C2ng>  
  5、 添加代码,编译运行程序。 &CO| Y(+  
}{=8&gA0  
三、程序代码 `U#Po_hq  
WVkG 2  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL %^U"Spv;  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) "uS7PplyO  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ I4ctxMVP  
#if _MSC_VER > 1000 3.~h6r5-  
#pragma once *#GDi'0  
#endif // _MSC_VER > 1000 ?&\h;11T  
#ifndef __AFXWIN_H__ & qL<C  
#error include 'stdafx.h' before including this file for PCH #'iPDRYy  
#endif L6kZ2-6  
#include "resource.h" // main symbols @ AggznA8  
class CHookApp : public CWinApp O(Td:Zdp  
{ '2xcce#  
 public: <vLdBfw&N  
  CHookApp(); i :EO(`  
  // Overrides /Mx.:.A&$  
  // ClassWizard generated virtual function overrides kU(kU2u%9  
  //{{AFX_VIRTUAL(CHookApp) #!1IP~  
 public: Yg|"-  
  virtual BOOL InitInstance(); BDp:9yau  
  virtual int ExitInstance(); AtT"RG-6  
  //}}AFX_VIRTUAL 9nO(xJ"e4  
  //{{AFX_MSG(CHookApp) 7 y>(H<^>  
  // NOTE - the ClassWizard will add and remove member functions here. pMDH  
  // DO NOT EDIT what you see in these blocks of generated code ! $>(9~Yh0  
  //}}AFX_MSG G V=OKf#  
  DECLARE_MESSAGE_MAP() Md?acWE*L  
}; /khnl9~+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); uYabJqV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?4MSgu  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); HoV{Uzm  
BOOL InitHotkey(); ysl8LK   
BOOL UnInit(); {9Xm<}%u]]  
#endif gu!](yEgl  
o[n<M> @  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. qr9Imr0w<  
#include "stdafx.h" !^]q0x  
#include "hook.h" b.@H1L  
#include <windowsx.h> F/xCG nP-  
#ifdef _DEBUG u(8~4P0w  
#define new DEBUG_NEW F6DxvyANr  
#undef THIS_FILE YV4 : 8At1  
static char THIS_FILE[] = __FILE__; MN\i-vAL8  
#endif EZ*t$3.T  
#define MAX_KEY 100 Dl&PL  
#define CTRLBIT 0x04 4*H(sq  
#define ALTBIT 0x02 tr5'dX4]  
#define SHIFTBIT 0x01 +*: }p  
#pragma data_seg("shareddata") S;>4i!Mb ^  
HHOOK hHook =NULL; Mc!2mE%47m  
UINT nHookCount =0; ),M U+*`  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 9n-T5WP  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT tz"5+uuu  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey (;C$gnr.C  
static int KeyCount =0; )G^p1o;\  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift '1Y<RD>x  
#pragma data_seg() T<XfZZ)l<`  
HINSTANCE hins; P:>'   
void VerifyWindow(); (y 3~[  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) xSx&79Ez<*  
//{{AFX_MSG_MAP(CHookApp) Z 4\tY^NI  
// NOTE - the ClassWizard will add and remove mapping macros here. J-b~4  
// DO NOT EDIT what you see in these blocks of generated code! u/;_?zI  
//}}AFX_MSG_MAP 2 ae w6~  
END_MESSAGE_MAP() `!<x"xKu  
2.!1kije  
CHookApp::CHookApp() ^4RO  
{ ~d&'Lp[3  
 // TODO: add construction code here, Tm%WWbc  
 // Place all significant initialization in InitInstance aD?# ,  
} Z(l9>A7!  
%Fs*#S  
CHookApp theApp; K?$ 9N}+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) AL(n *,  
{ i[o&z$JO  
 BOOL bProcessed=FALSE; -<]\l3E&J  
 if(HC_ACTION==nCode) Av@& hD\  
 { ;tXB46  
  if((lParam&0xc0000000)==0xc0000000){// Key up >c}:   
   switch(wParam) q|R+x7x  
   { zoR,RBU6  
    case VK_MENU: $xLEA\s  
     MaskBits&=~ALTBIT; x`Vy<h 33  
     break; 4u@yJ?U  
    case VK_CONTROL: <zfO1~^  
     MaskBits&=~CTRLBIT; =VCi8jDkP  
     break; /]pX8 d  
    case VK_SHIFT: Dp%5$wF)8  
     MaskBits&=~SHIFTBIT; W]} #\\$z  
     break; +[>y O _}  
    default: //judge the key and send message jG =(w4+  
     break; A1mYkG)l  
   } f&=K]:WDe  
   for(int index=0;index<MAX_KEY;index++){ @gs26jX~2}  
    if(hCallWnd[index]==NULL) FP.(E9  
     continue; <GSQ2bX[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) H<v c\r  
    { |*lH9lWJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); A$%@fO.b  
     bProcessed=TRUE; Q~x*bMb.  
    } j@%K*Gb`  
   } >|v=Ba6R0  
  } p Z0=  
  else if((lParam&0xc000ffff)==1){ //Key down eL>K2Jxq  
   switch(wParam) Z'voCWCd  
   { 5Xp$ yX =  
    case VK_MENU: 8W(<q|t  
     MaskBits|=ALTBIT; w g$D@E7  
     break; ac2}3 $u  
    case VK_CONTROL: N;e;4,_ n  
     MaskBits|=CTRLBIT; rdORNlK&  
     break; -OHvK0~  
    case VK_SHIFT: pI'8>_o  
     MaskBits|=SHIFTBIT; _K 4eD.  
     break; $ijx#a&O  
    default: //judge the key and send message 8yY"x ['  
     break; 71K\.[ =-  
   } Q,[rrG;?@  
   for(int index=0;index<MAX_KEY;index++) }~7H2d);-  
   { R tXF  
    if(hCallWnd[index]==NULL) }T?i%l  
     continue; >:3xi{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ej;Vr~Wi  
    { ##SLwrg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *5ka.=Qs  
     bProcessed=TRUE; @C!JtgO%  
    } Se!gs>  
   } (1QdZD|  
  } c.|sW2/  
  if(!bProcessed){ 8Uj68Jl?  
   for(int index=0;index<MAX_KEY;index++){ {LR#(q$1  
    if(hCallWnd[index]==NULL) 6|Ba  
     continue; >qSO,$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $M:4\E5(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [V!^\g\6  
   } )_Z]=5Ds  
  } u i s:\Uc  
 } T=hm#]   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7H8GkuO  
} O^QR;<t'  
&6|6J1c8  
BOOL InitHotkey() \#h})`  
{ O+CF/ipX/  
 if(hHook!=NULL){ jldcvW  
  nHookCount++; gJWlWVeq$  
  return TRUE; Mq rt-VPh  
 }  ` 4s#5g  
 else GV `idFd  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); &-EyM*:u!  
  if(hHook!=NULL) z{ Zimr  
   nHookCount++; !?tu! M<1?  
  return (hHook!=NULL); O3sla bE#  
} Yke<Wy1  
BOOL UnInit() e8WPV  
{ +lY\r +;  
 if(nHookCount>1){ :Su5  
  nHookCount--; hr/xpQW  
  return TRUE; mI _ 6f~  
 } B1 jH.(  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +iZ@.LI  
 if(unhooked==TRUE){ UgOGBj,&5W  
  nHookCount=0; pn ~/!y  
  hHook=NULL; jk WBw.(  
 }  RU3_Fso  
 return unhooked; &;uGIk>s  
} baO&n  
;iwD/=Y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) LN,$P  
{ }RC. Q`b  
 BOOL bAdded=FALSE; 4nVO.Ud0$X  
 for(int index=0;index<MAX_KEY;index++){ (o6A?37i  
  if(hCallWnd[index]==0){ K4K3< Pg  
   hCallWnd[index]=hWnd; -7C=- \]  
   HotKey[index]=cKey; (AyRs7Dkn  
   HotKeyMask[index]=cMask; hs -}:^S`  
   bAdded=TRUE; #U6/@l)  
   KeyCount++; /_ hfjCE  
   break; g:@Cg.q8  
  } |zr)hC  
 } IArpCF/"8  
 return bAdded; O(c4iWm  
} {<Xo,U7 y  
{kY`X[fvZ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !T&u2=`D  
{ _3FMQY(  
 BOOL bRemoved=FALSE; p!rG PyGC  
 for(int index=0;index<MAX_KEY;index++){ Q xj|lr  
  if(hCallWnd[index]==hWnd){ 6i?kkULBS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 52q!zx E  
    hCallWnd[index]=NULL; B4M'Er{v  
    HotKey[index]=0; DI"dY ug#  
    HotKeyMask[index]=0; 4F 6ju6w  
    bRemoved=TRUE; /M{)k_V  
    KeyCount--; 7\Yq]:;O  
    break; &`\kb2uep  
   } ;Kq<',u~  
  } n=#[Mi $Y  
 } <iY 9cV|}3  
 return bRemoved; @/ovdf{  
} #q^>qX y  
sov62wuqU  
void VerifyWindow() ,M9hb<:m  
{ G1n>@Y'j''  
 for(int i=0;i<MAX_KEY;i++){ g'l7Jr3  
  if(hCallWnd!=NULL){ Q%b46"  
   if(!IsWindow(hCallWnd)){ vp9E}ga  
    hCallWnd=NULL; 'E4(!H,k  
    HotKey=0; N]<~NG:6b  
    HotKeyMask=0; F0o18k_"  
    KeyCount--; k%bTs+] *  
   } (HP={MrV  
  } "p_[A  
 } 5"Xo R)  
} 9BgQ oK@  
rqG6Ll`=+  
BOOL CHookApp::InitInstance() k+>p!1  
{ U]R|ej  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); _ jM6ej<  
 hins=AfxGetInstanceHandle(); fSb@7L  
 InitHotkey(); K`AW?p^$Y  
 return CWinApp::InitInstance(); ^,\se9=(  
} H"Em|LX^  
0^tJX1L  
int CHookApp::ExitInstance() I?xhak1)lu  
{ ^LAS9K1.  
 VerifyWindow(); BRQ5  
 UnInit(); )F9V=PJE  
 return CWinApp::ExitInstance(); uma9yIk  
} F\$}8,9  
C8%nBa /  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $F==n4)  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) s13 d*  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ rH9|JEz  
#if _MSC_VER > 1000 ,19"[:WN  
#pragma once Q!$kUcky9  
#endif // _MSC_VER > 1000 q?b)zeJ  
QH56tQq  
class CCaptureDlg : public CDialog VE+p&0  
{ xdSj+507  
 // Construction i OA3x 8J  
 public: ,jdKcWy'  
  BOOL bTray; bgx5{!A  
  BOOL bRegistered; _M[[o5{  
  BOOL RegisterHotkey(); (>/Dw|,m  
  UCHAR cKey; r;s3(@[,@  
  UCHAR cMask; ~o\]K  
  void DeleteIcon(); ]&%X(jWyn  
  void AddIcon(); pz z`4VS:  
  UINT nCount; Tr+Y@]"  
  void SaveBmp(); FV<^q|K/(]  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor l[ OQo|_  
  // Dialog Data k1  txY  
  //{{AFX_DATA(CCaptureDlg) i2Iu 2  
  enum { IDD = IDD_CAPTURE_DIALOG }; sZ(Q4)r  
  CComboBox m_Key; ?_`P;}4#  
  BOOL m_bControl; MDXQj5s^  
  BOOL m_bAlt; ` G/QJH{I  
  BOOL m_bShift; t3kh]2t  
  CString m_Path; |x~ei_x7.p  
  CString m_Number; @;-Un/'C;7  
  //}}AFX_DATA b+fy&rk@-  
  // ClassWizard generated virtual function overrides r_2VExk  
  //{{AFX_VIRTUAL(CCaptureDlg) ~ 8qFM  
 public: 7.=s1~p  
  virtual BOOL PreTranslateMessage(MSG* pMsg); "B{xC}Tw  
 protected: P) 0=@{(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (:hmp"S  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); K LM^O$=  
  //}}AFX_VIRTUAL I2!&="7@  
  // Implementation pPqbD}p  
 protected: R yIaT  
  HICON m_hIcon; ;Z0cD*Jb  
  // Generated message map functions j-\^ }K.&  
  //{{AFX_MSG(CCaptureDlg) +=F);;!  
  virtual BOOL OnInitDialog(); +/ d8d  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); E~U|v'GCd  
  afx_msg void OnPaint(); ZtZV:re=  
  afx_msg HCURSOR OnQueryDragIcon(); a[OLS+zf!P  
  virtual void OnCancel(); A&|(%  
  afx_msg void OnAbout(); m_W.r+s~C4  
  afx_msg void OnBrowse(); uTF EI.N  
  afx_msg void OnChange(); vVRCM  
 //}}AFX_MSG K>E!W!-PJ  
 DECLARE_MESSAGE_MAP() J};,%q_  
}; ;R>42 qYF  
#endif T%xL=STJNy  
# SOj4W  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file bSKV|z/x  
#include "stdafx.h" M;@03 x W  
#include "Capture.h" yH0ZSv  
#include "CaptureDlg.h" 'g, x}6  
#include <windowsx.h> ]$%4;o4O  
#pragma comment(lib,"hook.lib")  E8V\J  
#ifdef _DEBUG FKTP0e7=9  
#define new DEBUG_NEW $zH 0$aOx  
#undef THIS_FILE 2G*#Czr"  
static char THIS_FILE[] = __FILE__; `e:RZ  
#endif UmMYe4LQR  
#define IDM_SHELL WM_USER+1 |UiykQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); z+`)|c4-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [\y>&"uk  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; >TVd*S  
class CAboutDlg : public CDialog Ho*RLVI0U  
{ n/|`Dz.  
 public: =Qq^=3@h  
  CAboutDlg(); N`:b vr  
  // Dialog Data `'t;BXedz/  
  //{{AFX_DATA(CAboutDlg) <OFqUp*l  
  enum { IDD = IDD_ABOUTBOX }; 23?0'AU  
  //}}AFX_DATA  PW\FcT  
  // ClassWizard generated virtual function overrides V)?g4M3}  
  //{{AFX_VIRTUAL(CAboutDlg) i(#c Yb  
 protected: rm;"98~zJ?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support , X+(wp  
  //}}AFX_VIRTUAL ed2 &9E>9b  
  // Implementation x@l~*6!K  
 protected: |Y8o+O_`  
  //{{AFX_MSG(CAboutDlg) +m},c-,=$w  
  //}}AFX_MSG >dH*FZ:c  
  DECLARE_MESSAGE_MAP() Uv$ u\D+@[  
}; O c3%pb;  
FK('E3PG  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) tA n6pGp  
{ AMiFsgBj  
 //{{AFX_DATA_INIT(CAboutDlg) QxL FN(d  
 //}}AFX_DATA_INIT =C}<0<"iF  
} lBC-G*#  
&xT~;R^  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) '.v^seU  
{ *g}&&$b0  
 CDialog::DoDataExchange(pDX); XsMphZnK  
 //{{AFX_DATA_MAP(CAboutDlg) b,sc  
 //}}AFX_DATA_MAP )xs,  
} j ZafwBi  
7l EwQ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 55en D  
 //{{AFX_MSG_MAP(CAboutDlg) =&xoyF  
 // No message handlers <08V-   
 //}}AFX_MSG_MAP =f|a?j,f~  
END_MESSAGE_MAP() <;"=ah7A  
cC]1D*Bn  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) LxDhthZi_  
: CDialog(CCaptureDlg::IDD, pParent) %P6!vx:&^b  
{ N* -Z Jv  
 //{{AFX_DATA_INIT(CCaptureDlg) +5\\wGo<  
  m_bControl = FALSE; ,_-*/- 7;8  
  m_bAlt = FALSE; d8I:F9  
  m_bShift = FALSE; bME3" e{O  
  m_Path = _T("c:\\"); w#b2iE+Bw  
  m_Number = _T("0 picture captured."); }e@-[RJ!  
  nCount=0; `v er "s;  
  bRegistered=FALSE; 9D21e(7X  
  bTray=FALSE; qa?y lR"kA  
 //}}AFX_DATA_INIT pdu  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 w\4m -Z{  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); p+?WhxG)  
} dkC/ ?R  
F4{<;4N0  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) pP& M]'  
{ ^a5>`W  
 CDialog::DoDataExchange(pDX); a"4 6_>  
 //{{AFX_DATA_MAP(CCaptureDlg) z#/*LP#oY  
  DDX_Control(pDX, IDC_KEY, m_Key); c^k. <EA  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); -qF|Y f  
  DDX_Check(pDX, IDC_ALT, m_bAlt); rpWy 6oD  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); #+\G- =-  
  DDX_Text(pDX, IDC_PATH, m_Path); b>EUa> h  
  DDX_Text(pDX, IDC_NUMBER, m_Number); /ep~/#Ia  
 //}}AFX_DATA_MAP ?8/h3xV;  
} ]vErF=[U,  
';F][x5j  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 1>{(dd?L  
//{{AFX_MSG_MAP(CCaptureDlg) )P])0Y-  
 ON_WM_SYSCOMMAND() {D#`+uw  
 ON_WM_PAINT() xx8na8  
 ON_WM_QUERYDRAGICON()  (v}:  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) YJ$ =`lIM  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) kRPg^Fw"Vw  
 ON_BN_CLICKED(ID_CHANGE, OnChange) >AJ|F)  
//}}AFX_MSG_MAP @9a=D<'>  
END_MESSAGE_MAP() s,x]zG"  
eW%jDsC  
BOOL CCaptureDlg::OnInitDialog() RdHR[Usm  
{ Tkf !Y?  
 CDialog::OnInitDialog(); yL-L2  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); X;tk\Ixd  
 ASSERT(IDM_ABOUTBOX < 0xF000); E .5xzY  
 CMenu* pSysMenu = GetSystemMenu(FALSE); }fZBP]<I(  
 if (pSysMenu != NULL) VCO/s9AL  
 { -%|I  
  CString strAboutMenu; <i-RF-*S  
  strAboutMenu.LoadString(IDS_ABOUTBOX); l<?wB|1'  
  if (!strAboutMenu.IsEmpty()) N%+M+zEJ  
  { <Z;BB)I&C`  
   pSysMenu->AppendMenu(MF_SEPARATOR); 70eN]OY  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); :Ib\v88WIv  
  } %|>i2  
 } `314.a6S  
 SetIcon(m_hIcon, TRUE); // Set big icon ,~#hHhR_  
 SetIcon(m_hIcon, FALSE); // Set small icon EK_^#b  
 m_Key.SetCurSel(0); sP%.o7&n  
 RegisterHotkey(); >rubMGb  
 CMenu* pMenu=GetSystemMenu(FALSE); +l(}5(wc  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 3OlY Ml  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); I5]zOKlVR  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); w0iE x1i  
 return TRUE; // return TRUE unless you set the focus to a control rB]/N,R   
} u.6%n. g  
{'%=tJ[YX  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) TF>F7v(,45  
{ 9`AQsZ2  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) b8&9pLl  
 { ;nE}%lT  
  CAboutDlg dlgAbout; ; ]!  
  dlgAbout.DoModal(); _NFJm(X.  
 } 4tjRju?  
 else ?$Pj[O^hl  
 { ~m7+^c@,  
  CDialog::OnSysCommand(nID, lParam); vNIQc "\-  
 } ,U}8(D~:  
} 75y#^pD?c  
b%(0AL  
void CCaptureDlg::OnPaint() <>TBM^  
{ Alz#zBGb  
 if (IsIconic()) ff0,K#-  
 { syF/jWM5  
  CPaintDC dc(this); // device context for painting (!s[~O6  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); jk@]d5  
  // Center icon in client rectangle i{2KMa{K  
  int cxIcon = GetSystemMetrics(SM_CXICON); P;34Rd  
  int cyIcon = GetSystemMetrics(SM_CYICON); YQ/ *|  
  CRect rect; z5I<,[`  
  GetClientRect(&rect); }O/Nn0,  
  int x = (rect.Width() - cxIcon + 1) / 2; {8Ll\j@ "  
  int y = (rect.Height() - cyIcon + 1) / 2; V|= 1<v  
  // Draw the icon .;'xm_Gw<  
  dc.DrawIcon(x, y, m_hIcon); AO6;aT  
 } jo;n~>3P  
 else <S qbj;  
 { b~}}{fm&f  
  CDialog::OnPaint(); s6I]H  
 } Ts\7)6|F  
} 6C:Lq%}  
>qCT#TY  
HCURSOR CCaptureDlg::OnQueryDragIcon() 0Ko,S(M_  
{ hjE9[{K  
 return (HCURSOR) m_hIcon; 9pXFC9  
} dU,/!|.K  
\ iFE,z  
void CCaptureDlg::OnCancel() qF ?S[Z;  
{ < qBPN{'a"  
 if(bTray) dZ*o H#B  
  DeleteIcon(); LBg#KQ @  
  CDialog::OnCancel(); +]#>6/2q  
} V47 Fp  
@azS)4L  
void CCaptureDlg::OnAbout() WKG=d]5  
{ 1na[=Q2  
 CAboutDlg dlg; 0*q:p`OLw*  
 dlg.DoModal(); x {rt\OT  
} .#X0P=  
HwHI$IB  
void CCaptureDlg::OnBrowse() )~6974  
{ m5S/T\,X  
 CString str; gI]Vyg<{d  
 BROWSEINFO bi; B~^\jRd "  
 char name[MAX_PATH]; ^JTfRZ :a  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ?@~FT1"6G  
 bi.hwndOwner=GetSafeHwnd(); bnlL-]]9z  
 bi.pszDisplayName=name; R~`Y6>o~9:  
 bi.lpszTitle="Select folder"; gVGq  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; G 6][@q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ;BqX=X+#  
 if(idl==NULL) E$cr3 t7Xy  
  return; +wmfl:\^{H  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Y , P-@(  
 str.ReleaseBuffer(); 7 ir T6O<.  
 m_Path=str; }5~ ;jN=k  
 if(str.GetAt(str.GetLength()-1)!='\\') X@arUs7  
  m_Path+="\\"; ,GK>|gNsb  
 UpdateData(FALSE); 7Qo*u;fr  
} ]SQ_*$`  
@t_<oOI2  
void CCaptureDlg::SaveBmp() k z#DBh!&  
{ !n7?w@2a'  
 CDC dc; /F\7_  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); p'H5yg3h  
 CBitmap bm; 8w{V[@QLn  
 int Width=GetSystemMetrics(SM_CXSCREEN); xe5>)\18-  
 int Height=GetSystemMetrics(SM_CYSCREEN); rJAY7/u  
 bm.CreateCompatibleBitmap(&dc,Width,Height); "PX~Yc  
 CDC tdc; 9`xq3EL2T  
 tdc.CreateCompatibleDC(&dc); XLtuck  
 CBitmap*pOld=tdc.SelectObject(&bm); sx22|j`)V  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); h.67] U7m  
 tdc.SelectObject(pOld); 4EOu)#  
 BITMAP btm; k2xjcrg  
 bm.GetBitmap(&btm); _%t w#cM  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; `q F:rQ  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); lU\|F5O@#  
 BITMAPINFOHEADER bih; qB8<(vBP+  
 bih.biBitCount=btm.bmBitsPixel; %hXa5}JL  
 bih.biClrImportant=0; a(m#GES  
 bih.biClrUsed=0; _8bqk\m+  
 bih.biCompression=0; lY6U$*9c  
 bih.biHeight=btm.bmHeight; j*CnnM#n  
 bih.biPlanes=1; #oHHKl=M  
 bih.biSize=sizeof(BITMAPINFOHEADER); UOa{J|k>h  
 bih.biSizeImage=size; Q} / :  
 bih.biWidth=btm.bmWidth; cM55 vVd  
 bih.biXPelsPerMeter=0; er97&5  
 bih.biYPelsPerMeter=0; b7\nCRY  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3c6<JW  
 static int filecount=0; le*pd+>j  
 CString name; vZ*5 93C8  
 name.Format("pict%04d.bmp",filecount++); -q-%)f  
 name=m_Path+name; k(T/yd rw  
 BITMAPFILEHEADER bfh; _mcD*V  
 bfh.bfReserved1=bfh.bfReserved2=0; 9;:Lf  
 bfh.bfType=((WORD)('M'<< 8)|'B'); xEbcF+@  
 bfh.bfSize=54+size; ](%-5G1<  
 bfh.bfOffBits=54; r1,RloyZS  
 CFile bf; ,#s}nJ4  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 9D&ocV3QV  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ~x824xW  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ll6~8PN  
  bf.WriteHuge(lpData,size); (Y-7B  
  bf.Close(); k+_pj k  
  nCount++; 6Z7{|B5}Y  
 } :g][99  
 GlobalFreePtr(lpData); 0Tq6\:  
 if(nCount==1) 3Y>!e#  
  m_Number.Format("%d picture captured.",nCount); T@X!vCjf6  
 else qg+ 8i9Y!  
  m_Number.Format("%d pictures captured.",nCount); qF>}"m  
  UpdateData(FALSE); ).xQ~A\.  
} ;X\,-pjv  
SC'fT!  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 1;SWfKU?.  
{ !sUo+Y  
 if(pMsg -> message == WM_KEYDOWN) S_C+1e  
 { Zsaz#z|xW  
  if(pMsg -> wParam == VK_ESCAPE) VNF@)!l  
   return TRUE; uZi]$/ic  
  if(pMsg -> wParam == VK_RETURN) )bqO}_B  
   return TRUE; Dk/;`sXV  
 } 7 v#sr<  
 return CDialog::PreTranslateMessage(pMsg); BsR xD9r  
} 'r3I/qg*m  
zxXm9zrLo  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ) _"`{2  
{ \  VJ3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ )~rN{W<s`H  
  SaveBmp(); )fv0H&g  
  return FALSE; l\a 0 k4  
} 2}t2k>  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ TN(1oJ:  
 CMenu pop; 7)z^*;x  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); m\[r6t]V  
 CMenu*pMenu=pop.GetSubMenu(0); |6$6Za]:  
 pMenu->SetDefaultItem(ID_EXITICON); mI@]{K}Q%  
 CPoint pt; L= hPu#&/  
 GetCursorPos(&pt); @MTm8E6au  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <!R~G-D#_T  
 if(id==ID_EXITICON) 0zetOlFbO  
  DeleteIcon(); nCJ)=P.d  
 else if(id==ID_EXIT) GoZr[=d  
  OnCancel(); NEJxd%-  
 return FALSE; Yaht<Hy  
} B xq(+^T  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); EC|t4u3  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Wfz&:J#  
 AddIcon(); e%SQ~n=H 9  
 return res; Q % )fuI  
} dFK/  
< OCy  
void CCaptureDlg::AddIcon() eVn]/.d  
{ Bk*AO?3p  
 NOTIFYICONDATA data; Q"S;r1 D  
 data.cbSize=sizeof(NOTIFYICONDATA); vEk jd#  
 CString tip; g&) XaF[!  
 tip.LoadString(IDS_ICONTIP); G)G5eXXX  
 data.hIcon=GetIcon(0); UOi8>;k`  
 data.hWnd=GetSafeHwnd(); "}Vow^vb  
 strcpy(data.szTip,tip); +.:- :  
 data.uCallbackMessage=IDM_SHELL; &V:iy  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; gYw4YP0Gz  
 data.uID=98; z`y!C3w<  
 Shell_NotifyIcon(NIM_ADD,&data); ilHZx2 k  
 ShowWindow(SW_HIDE); EE=!Y NP]  
 bTray=TRUE; ??Q'| r  
} jIaAx_  
+"'cSAK  
void CCaptureDlg::DeleteIcon() = a$7OV.  
{ *shE-w ;C  
 NOTIFYICONDATA data; Gk g)\ 3  
 data.cbSize=sizeof(NOTIFYICONDATA); N*gnwrP{  
 data.hWnd=GetSafeHwnd(); )OS^tG[=  
 data.uID=98; 4[v %]g`  
 Shell_NotifyIcon(NIM_DELETE,&data); >/9f>d?w^  
 ShowWindow(SW_SHOW); !8(: G6Ne  
 SetForegroundWindow(); 9{]U6A*K0w  
 ShowWindow(SW_SHOWNORMAL); vlY83mU.  
 bTray=FALSE; 8XIG<Nc  
} &Rdg07e;>  
Ko|nF-r_  
void CCaptureDlg::OnChange() 8GgZAu'X  
{ EIPNR:6t  
 RegisterHotkey(); [W;iR_7T5  
} tN&4t xB  
pX `BDYg.  
BOOL CCaptureDlg::RegisterHotkey() q'fZA;  
{ slaYr`u  
 UpdateData(); ,4M7:=gf  
 UCHAR mask=0; Nr8#/H2f  
 UCHAR key=0; ^}fc]ovV  
 if(m_bControl) CB]#`|f  
  mask|=4; ^{lcj  
 if(m_bAlt) 3copJS  
  mask|=2; dZ K /v  
 if(m_bShift) -fKo~\Pr  
  mask|=1; F9IrbLS9c  
  key=Key_Table[m_Key.GetCurSel()]; h fZY5+Z<  
 if(bRegistered){ la+RK  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); E">FH >8K}  
  bRegistered=FALSE; lA>^k;+>  
 } ia6%>^  
 cMask=mask; P|*c7+q  
 cKey=key; C@1B?OfJ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ]-]K4*{   
 return bRegistered; f9ux+XQk9  
} lLhvpvT  
;+jz=9Q-  
  四、小结 jMr[ UZ  
|C"(K-do  
  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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