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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: aQ)9<LsI  
  uk1IT4+  
  一、实现方法 C.@zVt  
lY1m%  
  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: oqj3Q 1  
C?B7xK  
#pragma data_seg("shareddata") IOA{l N6  
HHOOK hHook =NULL; //钩子句柄 ri:fo'4TO  
UINT nHookCount =0; //挂接的程序数目 |9y &;3  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ~ e"^-x  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 NlKnMgt~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey T>c;q%A/  
static int KeyCount =0; (~P&$$qfD  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 WDZEnauE  
#pragma data_seg() r=9*2X#  
)S%mKdOm $  
  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。 t`LH\]6@  
u7/M>YJ`T  
  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: {[$p}#7Y  
EgY]U1{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR J ^v_VZ3  
cKey,UCHAR cMask) v uJ~Lg{  
{ }$7Hf+G  
 BOOL bAdded=FALSE; u4S3NLG)  
 for(int index=0;index<MAX_KEY;index++){ dlW w=^  
  if(hCallWnd[index]==0){ D1w_Vpz  
   hCallWnd[index]=hWnd; :>,d$f^tqE  
   HotKey[index]=cKey; 3{%/1>+x5  
   HotKeyMask[index]=cMask; D\k);BU~  
   bAdded=TRUE; H(pOR< `  
   KeyCount++; 0trFLX  
   break; ';1 c  
  } UpgOU.  
 } nyIb8=f  
 return bAdded; H P7Ec  
} =v_ju;C=  
//删除热键 Fc=8Qt^  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ht1 jrCe  
{ #&@&BlIe  
 BOOL bRemoved=FALSE; 5'o.v^l  
 for(int index=0;index<MAX_KEY;index++){ y,%w`  
  if(hCallWnd[index]==hWnd){ v9<p@GY"\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d`:0kOF+  
    hCallWnd[index]=NULL; ^|8cS0dK]Q  
    HotKey[index]=0; H[Qh*pq2  
    HotKeyMask[index]=0; 3Mdg&~85  
    bRemoved=TRUE; Y)uNzb6R  
    KeyCount--; 3*FktXmI}  
    break; 1D*e u  
   } )ow3Bl8w  
  } ULoTPx@N  
 } .z_^_@qdm  
 return bRemoved; 2/;KZ+U&  
} _-D(N/  
ic3qb<2  
Oe5aNo  
  DLL中的钩子函数如下: p@!"x({@l  
/O8'8sL5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ue`F|  
{ uU<Yf5  
 BOOL bProcessed=FALSE; {!-w|&bF  
 if(HC_ACTION==nCode) 6 Fm.^9@  
 { >6aCBS?2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 9/nL3U@i1  
   switch(wParam) ^lQej%  
   {  t$}+oCnkv  
    case VK_MENU: 0^.q5#A2  
     MaskBits&=~ALTBIT; LIR2B"3F  
     break; .M_;mhRI  
    case VK_CONTROL: ~zuMX ;[  
     MaskBits&=~CTRLBIT; [*1c.&%(  
     break; o2jnmv~  
    case VK_SHIFT: K46mE   
     MaskBits&=~SHIFTBIT; QJv,@@mu  
     break; NoPM!.RU{  
    default: //judge the key and send message ^c=@2#^\  
     break; p>MX}^6  
   } !D  
   for(int index=0;index<MAX_KEY;index++){ ]qXfg c  
    if(hCallWnd[index]==NULL) au GN~"n^  
     continue; @ #V31im"N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -8EdTc@  
    { %D&FnTa  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #Uudx~b  
     bProcessed=TRUE; oVLz7Y[JE  
    } 0a(*/u  
   } {xOu*8J  
  } p*>[6{$3)O  
  else if((lParam&0xc000ffff)==1){ //有键按下 YGxdYwBwf  
   switch(wParam) D]4?UL  
   { #M_QSD}&  
    case VK_MENU: <,LeFy\zW  
     MaskBits|=ALTBIT; {B[i|(xQx  
     break; Vv zd>yII  
    case VK_CONTROL: 6H3_q x  
     MaskBits|=CTRLBIT; g :O.$  
     break; P{);$e+b~  
    case VK_SHIFT: `pLp+#1 `R  
     MaskBits|=SHIFTBIT; \0b ",|"3  
     break; 6k ^vF~  
    default: //judge the key and send message u]zb<)'_  
     break; 9%)'QDVGLf  
   } c>]_,Br~  
   for(int index=0;index<MAX_KEY;index++){ mNV4"lNR  
    if(hCallWnd[index]==NULL) ka]n+"~==\  
     continue; y{kXd1,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (2%C% #]8  
    { O *jNeYA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); A]R"C:o  
     bProcessed=TRUE; BL]^+KnP  
    } #'"h+[XY  
   } |Q7Ch]G  
  } >q]r)~8F^  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 NMOTWA }2  
   for(int index=0;index<MAX_KEY;index++){ xNjA>S\]W5  
    if(hCallWnd[index]==NULL) ;7qk9rz4  
     continue; k5<lkC2z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {VI%]n{M  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5Lue.U%a  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 y_J{+  
   } TN l$P~X>  
  } GifD>c |z  
 } |>[w $  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Wqy8ZgSC  
} ^ 41 p+  
I]T-}pG  
  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: 2wu 5`Z[E  
m@jOIt!<  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +L_.XToq-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &npf %Eub  
CNP?i(Rk  
  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: ,E/vHI8  
!&#CEF@J  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) xv1$,|^ts  
{ {5*+  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) `5x,N%9{  
 { K<N0%c~  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 m 81\cg  
  SaveBmp(); o6{XT.z5qx  
  return FALSE; c5Offnq'1  
 } 9N9|hy  
 …… //其它处理及默认处理 hf%W grO.  
} I\4 I,ds  
ti'OjoJL  
&9^c-;Vs  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 A~h8 >zz*  
 f0:)  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ZtIK"o-|!  
#+r-$N.7  
  二、编程步骤 GhQ.}@*  
m.lNKIknQ  
  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"; V1(eebi|  
wu s]  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 3fBq~Q  
sYXVSNonm  
  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; J| 3CG;+  
bEPXNN  
  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; VeCpz[r  
heRQ|n.Dz)  
  5、 添加代码,编译运行程序。 LZ^sc  
zu*h9}  
三、程序代码 d'DS7F(c{  
UY>{e>/H9  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 783a Z8  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) >o(*jZ  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ CuDU~)`  
#if _MSC_VER > 1000 SR8[ 7MU  
#pragma once 1OJ:Vy}n  
#endif // _MSC_VER > 1000 :%s9<g;-h_  
#ifndef __AFXWIN_H__ GT'%HmQI  
#error include 'stdafx.h' before including this file for PCH .llAiv  
#endif Xr':/Qjf  
#include "resource.h" // main symbols k9Yr&8B  
class CHookApp : public CWinApp Z73 ysn}  
{ ]>x674H  
 public: %f?#) 01>  
  CHookApp(); /GCSC8T  
  // Overrides _{T`ka  
  // ClassWizard generated virtual function overrides $k}+,tHtJO  
  //{{AFX_VIRTUAL(CHookApp) W6]iJ  
 public: _"z#I CT(  
  virtual BOOL InitInstance(); :Rq@%rL  
  virtual int ExitInstance(); & yw-y4 =  
  //}}AFX_VIRTUAL =axi0q?}  
  //{{AFX_MSG(CHookApp) #r0A<+t{T  
  // NOTE - the ClassWizard will add and remove member functions here. _pk=IHGsB  
  // DO NOT EDIT what you see in these blocks of generated code ! ,![C8il,  
  //}}AFX_MSG idz6m]{~yT  
  DECLARE_MESSAGE_MAP() BXm{x6\  
}; Xa%Z0% {  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); $^`hu%s,~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); drF"kTD"7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \$9S_z  
BOOL InitHotkey(); V8&%fxn+  
BOOL UnInit(); wwE9|'Ok  
#endif /&vUi7'  
{jr>Z"/q  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. w)3LYF  
#include "stdafx.h" w=O:|Xu#*  
#include "hook.h" n j1 cqh  
#include <windowsx.h> mnG\UK,k  
#ifdef _DEBUG RkC?(p  
#define new DEBUG_NEW aiUn bP  
#undef THIS_FILE &XN*T.Y`  
static char THIS_FILE[] = __FILE__; [NC^v.[1[  
#endif \5X34'7   
#define MAX_KEY 100 {9Y@?  
#define CTRLBIT 0x04 ]+,Z()  
#define ALTBIT 0x02 5tQffo8t  
#define SHIFTBIT 0x01 >e8 t  
#pragma data_seg("shareddata") @bS>XWI>  
HHOOK hHook =NULL; ~H?RHYP~  
UINT nHookCount =0; =OhhMAn  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey gM_Z/$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT b>;5#OQfn  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey l--xq^,`o]  
static int KeyCount =0; SyTcp?H  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift r+\it&cW+  
#pragma data_seg() g5/8u2d  
HINSTANCE hins; R],,-  
void VerifyWindow(); C\E Z8  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) \:^$ZBQr<n  
//{{AFX_MSG_MAP(CHookApp) #O=^%C 7p  
// NOTE - the ClassWizard will add and remove mapping macros here. :B)w0tVw  
// DO NOT EDIT what you see in these blocks of generated code! <XGOcekG  
//}}AFX_MSG_MAP L"#Tas\5  
END_MESSAGE_MAP() *$uKg zv3  
^8E/I]-  
CHookApp::CHookApp() P0UMMn\-#  
{ awo=%vJ&  
 // TODO: add construction code here, b(K.p?bt  
 // Place all significant initialization in InitInstance 3{~h Rd  
} nL@P {,J  
[Fj h  
CHookApp theApp; ; N!K/[p=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) x4Eq5"F7}  
{ l&5| =  
 BOOL bProcessed=FALSE; q0SvZw]f1  
 if(HC_ACTION==nCode) 7| IW\  
 { H`B%6S /  
  if((lParam&0xc0000000)==0xc0000000){// Key up Zb8i[1P  
   switch(wParam) &# `d8}3D  
   { <S TwylL  
    case VK_MENU: JA())0a  
     MaskBits&=~ALTBIT; ?=f\oH$  
     break; &)<]AG.vd!  
    case VK_CONTROL: G;wv.|\  
     MaskBits&=~CTRLBIT; h.=YAcR0D  
     break; 9sJbz=o]r  
    case VK_SHIFT: 2{#*z%|z  
     MaskBits&=~SHIFTBIT; m6aoh^I  
     break; -mcLT@  
    default: //judge the key and send message Po93&qE  
     break; $;"@;Lj%,  
   } ,_P(!7Z8  
   for(int index=0;index<MAX_KEY;index++){ Nf1) 5  
    if(hCallWnd[index]==NULL) A~O 'l&KB  
     continue; 5|Vb)QBv%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) o %Pi;8  
    { >8 VfijK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); CM8WI~  
     bProcessed=TRUE; R+rHa#M_  
    } l AE$HP'o  
   } j&[63XSe  
  } 4hZ-^AL"(  
  else if((lParam&0xc000ffff)==1){ //Key down :IbrV@gN{@  
   switch(wParam) tE<L4;t  
   { _/ P"ulNb  
    case VK_MENU: ^J\)cw  
     MaskBits|=ALTBIT; hq(3%- 7&  
     break; V ;"?='vVe  
    case VK_CONTROL: !W n'Ae9  
     MaskBits|=CTRLBIT; }me]?en_Ra  
     break; irgjq/&d  
    case VK_SHIFT: |0A n| 18  
     MaskBits|=SHIFTBIT; >p2v"XX  
     break; s^js}9]p  
    default: //judge the key and send message 9]7+fu  
     break; 7q$9\RR5  
   } Ay"x<JB{U2  
   for(int index=0;index<MAX_KEY;index++) (Q#ArMMORI  
   { A7~)h}~   
    if(hCallWnd[index]==NULL) OlMCF.W#3  
     continue; Qt]nlui~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1QjrL@$>15  
    { *E+) mB"~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  YVD%GJ  
     bProcessed=TRUE; UU$ +DL  
    } pl|< g9  
   } m S!/>.1[  
  } 6L'cD1pu  
  if(!bProcessed){ :8yrtbf$  
   for(int index=0;index<MAX_KEY;index++){ K xh)'aal  
    if(hCallWnd[index]==NULL) \ 1ys2BX  
     continue; F#Z]Xq0r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) KDg!Y(m{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); rQN+x|dKMb  
   } oPm1`x  
  } NM[w=  
 } ^ chlAQz(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); e>sr)M  
} 9tk}_+  
Ho\K %#u  
BOOL InitHotkey() e[>(L%QV+  
{ (J$JIPF  
 if(hHook!=NULL){ 3l5q?"$  
  nHookCount++; $N:m 9R  
  return TRUE; 8Bo'0  
 } kZPj{^c:  
 else cg0L(oI~  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); >(:KEA  
  if(hHook!=NULL) nb(#;3DQ  
   nHookCount++; 9bqfZ"6nXY  
  return (hHook!=NULL); Zff-Hl  
} ]V><gZ  
BOOL UnInit() %6kD^K-  
{ pd>EUdbrp&  
 if(nHookCount>1){ ^Q2K0'm5  
  nHookCount--; ?HZ+fS ,-  
  return TRUE; :%!=Ej.J  
 } ~A>3k2 N/e  
 BOOL unhooked = UnhookWindowsHookEx(hHook); >:KPvq!0  
 if(unhooked==TRUE){ 4'G<qJoc  
  nHookCount=0; Lr40rLx;u  
  hHook=NULL; |Z#) 1K  
 } ;y4 "wBX  
 return unhooked; oA_AnD?G+  
} eEezd[p  
k<8:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4Q_2GiF_ ?  
{ A-c3B+  
 BOOL bAdded=FALSE; p.8G]pS  
 for(int index=0;index<MAX_KEY;index++){ }SUe 4r&4}  
  if(hCallWnd[index]==0){ jpOi Eo  
   hCallWnd[index]=hWnd; > *vI:MG8  
   HotKey[index]=cKey; j31 Sc3vG  
   HotKeyMask[index]=cMask; yd`.Rb&V  
   bAdded=TRUE; f0MHh5  
   KeyCount++; R"=G?d)  
   break; l.>QO ;  
  } \HTXl]  
 } @i6D&e=  
 return bAdded; .CwMxuW  
} Ms^,]Q1{  
3u+~!yz  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {jggiMwo.v  
{  1=W>zC  
 BOOL bRemoved=FALSE; c_HYB/'  
 for(int index=0;index<MAX_KEY;index++){ oAvL?2  
  if(hCallWnd[index]==hWnd){ cz&FOP+!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ E xY ~.  
    hCallWnd[index]=NULL; y;sr# -L  
    HotKey[index]=0; ]UFf-  
    HotKeyMask[index]=0; u_zp?Nc  
    bRemoved=TRUE; IjJ3CJ<  
    KeyCount--; <@@.~Qm'  
    break; 83)2c a  
   } YujhpJ<  
  } DFqXZfjm  
 } AGPZd9  
 return bRemoved; !3?HpR/nV  
} YuLW]Q?v  
Eh8.S)E  
void VerifyWindow() LxsB.jb-  
{ Ed_A#@V  
 for(int i=0;i<MAX_KEY;i++){ TpZ)v.w~l7  
  if(hCallWnd!=NULL){ Tx],- U  
   if(!IsWindow(hCallWnd)){ u=RF6V|  
    hCallWnd=NULL; jJ|O]v$N  
    HotKey=0; Q]IpHNt[>  
    HotKeyMask=0; e @=Bl-  
    KeyCount--; } Tp!Ub\Cc  
   } kAf2g  
  } )6IO)P/Q~  
 } }$81FSKh  
} )P\ec  
S%g` X   
BOOL CHookApp::InitInstance() '0/t|V<  
{ 8[2^`g  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 5 E DGl  
 hins=AfxGetInstanceHandle(); *.W ![%Be  
 InitHotkey(); sq&$   
 return CWinApp::InitInstance(); 7lf* vqG  
} b~%(5r.  
 8(5}Jo+  
int CHookApp::ExitInstance() ]?b#~  
{ X;ijCZb3b  
 VerifyWindow(); H-^>Co_  
 UnInit(); <Cn-MOoM  
 return CWinApp::ExitInstance(); NfDg=[FN[  
} p>65(&N,  
>k kuw?O@  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 0 .t;i4  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) <EJ}9`t  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ y$K!g&lGA  
#if _MSC_VER > 1000 Fag%#jxI  
#pragma once `?91Cw=`  
#endif // _MSC_VER > 1000 {p1#H`  
^e^M A.kM,  
class CCaptureDlg : public CDialog 8]'qJ;E2  
{ $WrDZU 2z  
 // Construction h]vA%VuE'E  
 public: !);'Bk9o  
  BOOL bTray; Ba6''?;G  
  BOOL bRegistered; ([tbFI}A  
  BOOL RegisterHotkey(); V= !!;KR0  
  UCHAR cKey; | u7vY/  
  UCHAR cMask; `NyvJt^<  
  void DeleteIcon(); _ z{:Q  
  void AddIcon(); JEs?Rm1^.  
  UINT nCount; b":cj:mxL  
  void SaveBmp(); $>]7NTP  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor qmv%N  
  // Dialog Data Da)9s %_4  
  //{{AFX_DATA(CCaptureDlg) &37QUdp+p  
  enum { IDD = IDD_CAPTURE_DIALOG }; }_:^&cT  
  CComboBox m_Key; IGOqV>;  
  BOOL m_bControl; %j{gZTz-  
  BOOL m_bAlt; ]rXRon='  
  BOOL m_bShift; W?5^cEF  
  CString m_Path; qZG "{8  
  CString m_Number; Abd&p N  
  //}}AFX_DATA !1w=_  
  // ClassWizard generated virtual function overrides P*)}ENY  
  //{{AFX_VIRTUAL(CCaptureDlg) v; &-]ka  
 public: e>z3 \4  
  virtual BOOL PreTranslateMessage(MSG* pMsg); pDrM8)r  
 protected: ORyFE:p$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support H '&x4[J:  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); >N{K)a  
  //}}AFX_VIRTUAL j#Bea ,  
  // Implementation D CcM~  
 protected: '8}*erAg  
  HICON m_hIcon; ja#E}`wC4  
  // Generated message map functions W;eHDQ|  
  //{{AFX_MSG(CCaptureDlg) W`C2zbC  
  virtual BOOL OnInitDialog(); ^ejU=0+cN  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); BC 9rsb  
  afx_msg void OnPaint(); <Gr{h>b  
  afx_msg HCURSOR OnQueryDragIcon(); Qt+ K,LY  
  virtual void OnCancel(); pg [F{T<  
  afx_msg void OnAbout(); 1|q$Wn:*  
  afx_msg void OnBrowse(); oV&AJ=|\  
  afx_msg void OnChange(); y4w{8;Mh  
 //}}AFX_MSG t+|c)"\5h  
 DECLARE_MESSAGE_MAP() .FtW $Y~y  
}; ^8ZVB.Fv  
#endif J-au{eP^  
#t>w)`bA-  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file &C`t(e  
#include "stdafx.h" AQDT6E:  
#include "Capture.h" wm=!tx\`k  
#include "CaptureDlg.h" *"d"  
#include <windowsx.h> y.=ur,Nd  
#pragma comment(lib,"hook.lib") )k.;.7dXe  
#ifdef _DEBUG b$l@Z&[]  
#define new DEBUG_NEW ^uD r  
#undef THIS_FILE /608P:U  
static char THIS_FILE[] = __FILE__; nNSq6 Cj  
#endif soRt<83  
#define IDM_SHELL WM_USER+1 _%?}e|epy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); '+hiCX-_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qfd/t<?|D  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Cb%?s  
class CAboutDlg : public CDialog Q"h/o"-h  
{ 2,{m>fF  
 public: ypSW9n  
  CAboutDlg(); 1(CpTaa  
  // Dialog Data Jlj=FA`  
  //{{AFX_DATA(CAboutDlg) %oJ_,m_(  
  enum { IDD = IDD_ABOUTBOX }; se:]F/  
  //}}AFX_DATA /bjyV]N  
  // ClassWizard generated virtual function overrides NldeD2~H  
  //{{AFX_VIRTUAL(CAboutDlg) e23}'qb  
 protected: $-Lk,}s.*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support zWb>y  
  //}}AFX_VIRTUAL n ,!PyJ  
  // Implementation @T0F }(k  
 protected: 8 2nQ]  
  //{{AFX_MSG(CAboutDlg) AcqsXBKd  
  //}}AFX_MSG O(2)A>}  
  DECLARE_MESSAGE_MAP() -NHA{?6r  
}; _DnZ=&=MA  
<5%x3e"7u  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) jQxv` H  
{ sgW*0o  
 //{{AFX_DATA_INIT(CAboutDlg) $b,o3eC  
 //}}AFX_DATA_INIT dMK| l   
} JS]6jUB<B  
/o Q^j'v  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "CI#2tnL7  
{ %SaC[9=?  
 CDialog::DoDataExchange(pDX); j"{|* _6E_  
 //{{AFX_DATA_MAP(CAboutDlg) ?W:YS82  
 //}}AFX_DATA_MAP ~Gx"gK0  
} fjVGps$ j  
2R66 WK Q  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3J%(2}{y  
 //{{AFX_MSG_MAP(CAboutDlg) 4E/Q+^?  
 // No message handlers aKkL0 D  
 //}}AFX_MSG_MAP 2I(b ad  
END_MESSAGE_MAP() |75>8;  
=~}\g;K1Q  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) KSe `G;{  
: CDialog(CCaptureDlg::IDD, pParent) P1tc*2Z  
{ 5v >0$Y{  
 //{{AFX_DATA_INIT(CCaptureDlg) q,w8ca 4~y  
  m_bControl = FALSE; r`Y[XzT9  
  m_bAlt = FALSE; M S$^m2  
  m_bShift = FALSE; ByqB4Hv2  
  m_Path = _T("c:\\"); wqEO+7)S  
  m_Number = _T("0 picture captured."); f_2tMiy 5  
  nCount=0; P(D0ru  
  bRegistered=FALSE; *{5p/}p  
  bTray=FALSE; iPgewjx  
 //}}AFX_DATA_INIT 29p`G1n  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \X1?,gV_  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Q}zAC2@L  
} /UtCJMQ  
Sqw:U|h\FS  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Gw%P5 r}Y  
{ >={?H?C  
 CDialog::DoDataExchange(pDX); s$Z zS2d  
 //{{AFX_DATA_MAP(CCaptureDlg) xXkP(^ Y  
  DDX_Control(pDX, IDC_KEY, m_Key); `p0+j  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ++=t|ZS U  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ]Y@Db5S$T  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Z3X/SQ'0  
  DDX_Text(pDX, IDC_PATH, m_Path); y;aZMT.YI  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 6a$=m3ic  
 //}}AFX_DATA_MAP H*s_A/$  
} TN!8J=sx.  
,rkY1w-  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) - "`5r6  
//{{AFX_MSG_MAP(CCaptureDlg) HQqnJ;ns<  
 ON_WM_SYSCOMMAND() X <QSi   
 ON_WM_PAINT() LE$_qX`L  
 ON_WM_QUERYDRAGICON() QlT{8uw )  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) |-t>_+. J'  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1o5n1 A  
 ON_BN_CLICKED(ID_CHANGE, OnChange) av|r^zc  
//}}AFX_MSG_MAP qbcaiU`-^"  
END_MESSAGE_MAP() r: Ij\YQ  
2GB)K?1M  
BOOL CCaptureDlg::OnInitDialog() /B eA-\B  
{ 2UqLV^ZY  
 CDialog::OnInitDialog(); EMK>7 aks  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); B. '&[A  
 ASSERT(IDM_ABOUTBOX < 0xF000); "*E06=fiG  
 CMenu* pSysMenu = GetSystemMenu(FALSE); mY!os91KoO  
 if (pSysMenu != NULL) =SMI,p&  
 { -CePtq`  
  CString strAboutMenu; .&Tcds  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ++{,1wY\  
  if (!strAboutMenu.IsEmpty()) g>].m8DZ'  
  { /*Xr^X6  
   pSysMenu->AppendMenu(MF_SEPARATOR); E d6k7  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); e\o>(is  
  } -36pkC 6 \  
 } W%$sA}O  
 SetIcon(m_hIcon, TRUE); // Set big icon %#7NCdk;S  
 SetIcon(m_hIcon, FALSE); // Set small icon Z|l/6L8  
 m_Key.SetCurSel(0); J4Yu|E<&  
 RegisterHotkey(); IXQxjqd^  
 CMenu* pMenu=GetSystemMenu(FALSE); ]nmVT~lBe"  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); =Rv!c+?  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Q)vf>LwC2S  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); )o4B^kq  
 return TRUE; // return TRUE unless you set the focus to a control ^xz*%2@  
} O>FE-0rW}e  
S: b-+w|*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <WPLjgtn3  
{ b{X,0a{*  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) _4+'@u #  
 { E+'P|~>oX  
  CAboutDlg dlgAbout; F`C$F!GE  
  dlgAbout.DoModal(); -l)u`f^n|  
 } B}O M:0  
 else Xx)PyO  
 { b# v+_7  
  CDialog::OnSysCommand(nID, lParam); .lbo\v}2W  
 } LHJ}I5zv  
} i"4&UJu1;  
CSu}_$wC#  
void CCaptureDlg::OnPaint() Obj?,O  
{ SLGo/I*  
 if (IsIconic()) mEh([ZnY  
 { CGYZEPRR  
  CPaintDC dc(this); // device context for painting jEa U;  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /^Ckk  
  // Center icon in client rectangle (j>a?dKDS  
  int cxIcon = GetSystemMetrics(SM_CXICON); XXwe/>J  
  int cyIcon = GetSystemMetrics(SM_CYICON); mT:Z!sS  
  CRect rect; "~:AsZ"7  
  GetClientRect(&rect); <4{Jm8zJ  
  int x = (rect.Width() - cxIcon + 1) / 2; uC2-T5n'  
  int y = (rect.Height() - cyIcon + 1) / 2; 108cf~2&  
  // Draw the icon Ej;BI#gx=  
  dc.DrawIcon(x, y, m_hIcon); {`KRr:w  
 } !t.*xT4W  
 else ]; CTr0  
 { DERhmJ;>H  
  CDialog::OnPaint(); V:Z}cfR.7  
 } L'A>IBrz  
} v%|S)^c?:  
VyF|d? b  
HCURSOR CCaptureDlg::OnQueryDragIcon() >)+ -:  
{ 3_5]0:?]-  
 return (HCURSOR) m_hIcon; h! yI(cY  
} 2*[Gm e  
$27QY  
void CCaptureDlg::OnCancel() TAE@KSPvo  
{ }I )%Gw  
 if(bTray) |O!G[|/3  
  DeleteIcon(); kuX{2h*`  
  CDialog::OnCancel(); !Au@\/}  
} 7k<6oM1  
BSyl!>G6n8  
void CCaptureDlg::OnAbout() 45 \W%8  
{ m,3H]  
 CAboutDlg dlg; iYPlgt/Y!  
 dlg.DoModal(); |<2g^ZK)  
} @)^|U"  
p#QR^|7"  
void CCaptureDlg::OnBrowse() #'qDNY@w}  
{ 7]J7'!Iz  
 CString str; `<oNEr+#  
 BROWSEINFO bi; (H[ .\O-`  
 char name[MAX_PATH]; K5"8zF)*  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); |qAU\m"Pc  
 bi.hwndOwner=GetSafeHwnd(); o1k X`Eu  
 bi.pszDisplayName=name; # s}&  
 bi.lpszTitle="Select folder"; :svKE.7{  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; mD"[z}r)  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Md5|j0#p  
 if(idl==NULL) n)bbEXO  
  return; pPD}>q  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); xj#anr  
 str.ReleaseBuffer(); =1SG^rp  
 m_Path=str; C" 2K U*  
 if(str.GetAt(str.GetLength()-1)!='\\') <0h,{28  
  m_Path+="\\"; {^ jRV@  
 UpdateData(FALSE); FpYeuH%  
} J=`2{ 'l  
Rk$  
void CCaptureDlg::SaveBmp() CTP!{<ii  
{ tbm/gOBw  
 CDC dc; YLU.]UC  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); . l>.  
 CBitmap bm; q L-Ni  
 int Width=GetSystemMetrics(SM_CXSCREEN); tmgZNg  
 int Height=GetSystemMetrics(SM_CYSCREEN); &`LR{7m  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ;JHR~ TV  
 CDC tdc; zu! #   
 tdc.CreateCompatibleDC(&dc); l2h1CtAU  
 CBitmap*pOld=tdc.SelectObject(&bm); t}X+P`Ovq  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); } b/Xui9Q  
 tdc.SelectObject(pOld); OTmw/#ug  
 BITMAP btm; z[?&bF<|  
 bm.GetBitmap(&btm); %Mxc"% w  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; m2x=Qv][@c  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); p`=v$_]?(  
 BITMAPINFOHEADER bih; 9Z^\b)x  
 bih.biBitCount=btm.bmBitsPixel; &VdKL2  
 bih.biClrImportant=0; d>1cKmH!  
 bih.biClrUsed=0; IA3m.Vxj ^  
 bih.biCompression=0; M/5+AsT  
 bih.biHeight=btm.bmHeight; }J0HEpn4  
 bih.biPlanes=1; @p 2XaqZ  
 bih.biSize=sizeof(BITMAPINFOHEADER); ]dd TH l  
 bih.biSizeImage=size; yLY$1#Sa  
 bih.biWidth=btm.bmWidth; 1x3>XN]a  
 bih.biXPelsPerMeter=0; 9:4m@dguh-  
 bih.biYPelsPerMeter=0; u 2%E(pr  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); KfkU_0R+~v  
 static int filecount=0; vo!QJ  
 CString name; 9 .3?$(  
 name.Format("pict%04d.bmp",filecount++); 6Q~(ibKx  
 name=m_Path+name; KGP*G BZr  
 BITMAPFILEHEADER bfh; ?Hrj}K27  
 bfh.bfReserved1=bfh.bfReserved2=0; m+=L}[  
 bfh.bfType=((WORD)('M'<< 8)|'B'); =>Q$S  
 bfh.bfSize=54+size; h{/lW#[  
 bfh.bfOffBits=54; ur| vh5  
 CFile bf; R\Of ,  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ r-'CB  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Xwz'h;Ks_  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); /1z3Q_M  
  bf.WriteHuge(lpData,size); 0wpGIT!2  
  bf.Close(); mXK7y.9\  
  nCount++; j|DjO?._'  
 } ,(v=ZeI  
 GlobalFreePtr(lpData); E/ {v6S{)Y  
 if(nCount==1) 4OTrMT$y  
  m_Number.Format("%d picture captured.",nCount); D0*+7n3  
 else 4sM9~zC5  
  m_Number.Format("%d pictures captured.",nCount); %uQOAe55  
  UpdateData(FALSE); (4Ha'uqz  
} .:9XpKbt  
fI"OzIJV  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) VxqoE]Dh  
{ m2>$)\-;  
 if(pMsg -> message == WM_KEYDOWN) I/k/5  
 { 2=`}:&0l  
  if(pMsg -> wParam == VK_ESCAPE) bS&XlgnKi  
   return TRUE; E! mxa  
  if(pMsg -> wParam == VK_RETURN) |,lw$k93  
   return TRUE; d8N4@3CkL  
 } g=Bge)  
 return CDialog::PreTranslateMessage(pMsg); W+'f|J=  
} eQ80Kf~  
!vGJ 7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _M)J{ {?:  
{ (3  ]!ZV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ n,*E s/\  
  SaveBmp(); ^2-+MWW.  
  return FALSE; LLU]KZhtY|  
} z *~rd2  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){  +OeoA{-W  
 CMenu pop; C%q]o  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4O>0gK{w  
 CMenu*pMenu=pop.GetSubMenu(0); Z,:}H6Mj9  
 pMenu->SetDefaultItem(ID_EXITICON); #]}]ZE  
 CPoint pt; P:k!dRb9{  
 GetCursorPos(&pt); j*L-sU  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 39oI &D>8  
 if(id==ID_EXITICON) `(&GLv[i^2  
  DeleteIcon(); 2bt).gGm  
 else if(id==ID_EXIT) +O?`uV  
  OnCancel(); 4cZlQ3OE.  
 return FALSE; ,ek0)z.  
} oA`G\Xh_E  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -5u. Ix3  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) PD`EtkUnv  
 AddIcon(); M|IgG:a;T  
 return res; @q<d^]po  
} is6d:p  
LR% P\~  
void CCaptureDlg::AddIcon() mt]50}eK  
{ ?(E?oJ)(  
 NOTIFYICONDATA data; jU!ibs}R3  
 data.cbSize=sizeof(NOTIFYICONDATA); P%y$e0  
 CString tip; 6T-iBJT  
 tip.LoadString(IDS_ICONTIP); QB6. o6  
 data.hIcon=GetIcon(0); 3 adF) mh  
 data.hWnd=GetSafeHwnd(); %Zi}sm1t  
 strcpy(data.szTip,tip); 3&5AbIZ  
 data.uCallbackMessage=IDM_SHELL; wd<jh,Y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; KD73Aw  
 data.uID=98; N51WY7  
 Shell_NotifyIcon(NIM_ADD,&data); YE[{Y(5;q  
 ShowWindow(SW_HIDE); 9YVr9BM'K  
 bTray=TRUE; Dfw%Bu  
} K(heeZUt  
Q'c[yu  
void CCaptureDlg::DeleteIcon() /[=U$=uH  
{ m?]= =9  
 NOTIFYICONDATA data; '=1@,Skj-  
 data.cbSize=sizeof(NOTIFYICONDATA); y7-dae k  
 data.hWnd=GetSafeHwnd(); 4ad-'  
 data.uID=98; bw*D!mm,  
 Shell_NotifyIcon(NIM_DELETE,&data); ~'t+X  
 ShowWindow(SW_SHOW); c'uDK>  
 SetForegroundWindow(); q|S,^0cU  
 ShowWindow(SW_SHOWNORMAL); f1X]zk(=W  
 bTray=FALSE; U~_G *0  
} ?Suv.!wfLl  
E#/vgm=W;  
void CCaptureDlg::OnChange() I^!c1S  
{ xG|n7w*  
 RegisterHotkey(); ^k4 n  
} O+PRP"$g"  
?RU_SCp-  
BOOL CCaptureDlg::RegisterHotkey() ,Laz515  
{ 2hFOwI  
 UpdateData(); C0-,<X  
 UCHAR mask=0; ;;<[_gp,E  
 UCHAR key=0; >IEc4  
 if(m_bControl) zD): yEc  
  mask|=4; \5R>+[n!  
 if(m_bAlt) Jk,}3Cr/  
  mask|=2; Hg`2- Nl  
 if(m_bShift) T74."Lo#  
  mask|=1; ({9P, D~2  
  key=Key_Table[m_Key.GetCurSel()]; ],w+4;+  
 if(bRegistered){ m}GEx)Y D  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); w02t9vz  
  bRegistered=FALSE; vlx\hJ<I  
 } d1hXzJs  
 cMask=mask; #b+>O+vx8  
 cKey=key; &d i=alvv1  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); g0 Jy:`M  
 return bRegistered; z:p9&mi  
} oxJ#NGD  
^|lG9z%Foy  
  四、小结 6M X4h  
B+2Jea,N  
  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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