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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: $@_{p*q  
  ?w-1:NW jt  
  一、实现方法 I%oRvg|q  
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  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: v? L  
MDJc[am  
#pragma data_seg("shareddata") (8.{+8o  
HHOOK hHook =NULL; //钩子句柄 j~bAbOX12  
UINT nHookCount =0; //挂接的程序数目 iOXZ ]Xj5  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 m`z7fi7u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 / s,tY74'5  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey e@E17l-  
static int KeyCount =0; #ZJMlJ:q`"  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Vtr3G.P^  
#pragma data_seg() Ly;I,)w  
tJNIr5o  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 zh\$t]d<I  
4o<*PPA1  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: %}P4kEY  
CEuWw:)  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR (89Ji'dc  
cKey,UCHAR cMask) ',7a E@PJ  
{ <47k@Ym   
 BOOL bAdded=FALSE; 7h%4]  
 for(int index=0;index<MAX_KEY;index++){ *m9{V8Yi2  
  if(hCallWnd[index]==0){ LN4qYp6)G  
   hCallWnd[index]=hWnd; hoenQ6N^:  
   HotKey[index]=cKey; XVt/qb%)r  
   HotKeyMask[index]=cMask; e+.\pe\  
   bAdded=TRUE; wd[eJcQ,  
   KeyCount++; a d9CsvW  
   break; 4WC9US-k  
  } q*, Q5  
 } u)a'  
 return bAdded; )P?IqSEA%  
} re^Hc(8M  
//删除热键 !^e =P%S  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 'cV?i&;  
{ _T5)n=|  
 BOOL bRemoved=FALSE;  B/G-Yh$E  
 for(int index=0;index<MAX_KEY;index++){ /.Fj.6U5  
  if(hCallWnd[index]==hWnd){ U3E&n1AA  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ S,''>`w  
    hCallWnd[index]=NULL; 3uV4/% U  
    HotKey[index]=0;  |t))u`~  
    HotKeyMask[index]=0; * RWm47  
    bRemoved=TRUE; /)EY2Y'  
    KeyCount--; EF#QH _X  
    break; [ %}u=}@  
   } \ECu5L4  
  } {hQ6K)s  
 } Iy';x  
 return bRemoved; <xo-Fv  
} */z??fI27  
_OMpIdY,R*  
TW7:q83{l  
  DLL中的钩子函数如下: Z o=]dBp.  
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LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >xqM5#m`E$  
{ (gwj)?:  
 BOOL bProcessed=FALSE; c0_E_~  
 if(HC_ACTION==nCode) V5mlJml2(  
 { `]=oo%(h  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 vi!YN|}\  
   switch(wParam) ['q&@_d7  
   {  t{dSX?<nt  
    case VK_MENU: AQss4[\Dx  
     MaskBits&=~ALTBIT; } fZ`IOf  
     break; u,1}h L  
    case VK_CONTROL: +/rH(Ni  
     MaskBits&=~CTRLBIT; ,qQG;w,m  
     break; 3GH(wSv9\  
    case VK_SHIFT: k`\R+WK$  
     MaskBits&=~SHIFTBIT; LOvHkk@+  
     break; "Pz}@=  
    default: //judge the key and send message +*}{`L- :  
     break; ; A,#;%j  
   } /KCPpERk{  
   for(int index=0;index<MAX_KEY;index++){ ]]0,|My7  
    if(hCallWnd[index]==NULL) 6G AaV[])'  
     continue; ;`dh fcU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) WG u%7e]  
    { x%N\5 V1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -c%dvck^,  
     bProcessed=TRUE; uH@FU60  
    } f )Z%pgB  
   } t<j^q`;@v  
  } amWD-0V  
  else if((lParam&0xc000ffff)==1){ //有键按下 $w#r"= )  
   switch(wParam) #!2k<Q*5uT  
   { l|/LQ/  
    case VK_MENU: - nbMTY}  
     MaskBits|=ALTBIT; 1L nyWZ  
     break; dRi5hC$  
    case VK_CONTROL: B@y(.  
     MaskBits|=CTRLBIT; _ oFs #kW  
     break; 2xwlKmI N  
    case VK_SHIFT: e@#kRklV&  
     MaskBits|=SHIFTBIT; 5J2=`=FK  
     break; 1ocJ+  
    default: //judge the key and send message )$ Mmn  
     break; B,WTHU[AV  
   } BvD5SBa}"  
   for(int index=0;index<MAX_KEY;index++){ $wB^R(f@  
    if(hCallWnd[index]==NULL) bFS>)  
     continue; Bux [6O %  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d[D&J  
    { S6d`ioi-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 7nU6k%_%  
     bProcessed=TRUE; uC3:7  
    } SOZPZUUEJ  
   } %dST6$Z  
  } & fC!(Oy  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ao" %WX  
   for(int index=0;index<MAX_KEY;index++){ Sh6JF574T  
    if(hCallWnd[index]==NULL) :1ecx$  
     continue; :}:3i9e*2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) mmXm\]r>4  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); +|iYg/2  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 AK!hK>u`  
   } }n_p$g[Nj/  
  } /93l74.w  
 } wC_l@7 t  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); epHJ@W@#  
} nlYR-.  
+!IQj0&'Y3  
  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: @Ky> 9m{  
g7V8D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l_'[27  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); N==ZtKj F  
X~=xXN.  
  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: }R[#?ty;]  
m([(:.X/IX  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $rF=_D6  
{ eN? Y7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) LVJI_O{fH  
 { 7hW+T7u?  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ._w8J"E5  
  SaveBmp(); =L|tp%!  
  return FALSE; J_;N:7'p  
 } aNn"X y\ k  
 …… //其它处理及默认处理 /M;#_+VK<  
} aI(7nJ=R  
u%/fx~t$  
H=*5ASc  
  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。 im} ?rY  
{Gq*e/  
  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。 `1*nL,i  
oI:o"T77sA  
  二、编程步骤 =*qD4qYA  
&6 s) X  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; A1)wo^,  
-oeL{9;  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; tM-^<V&  
VErv;GyV  
  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; h&.wo !  
G+xt5n.%  
  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; D4eTTfQ  
tWTKgbj(  
  5、 添加代码,编译运行程序。 /+*#pDx/zW  
R[z`:1lo  
三、程序代码 a,F&`Wg  
C51bc6V  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL CQ`=V2:"ON  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) _=ua6}Xp  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ^;,M}|<h  
#if _MSC_VER > 1000 a?|vQ*W  
#pragma once Uoya3#4 G  
#endif // _MSC_VER > 1000 [ EFMu;q  
#ifndef __AFXWIN_H__ iovfo2!hD  
#error include 'stdafx.h' before including this file for PCH Uz cx6sw  
#endif 2%*MW"Q  
#include "resource.h" // main symbols {oc igR 0  
class CHookApp : public CWinApp E$9 Ys  
{ t?o ,RN:  
 public: c_aZ{S  
  CHookApp(); 5D M"0  
  // Overrides MuoF FvAA  
  // ClassWizard generated virtual function overrides g%F"l2M  
  //{{AFX_VIRTUAL(CHookApp) g (VNy@  
 public: &l$Q^g  
  virtual BOOL InitInstance(); %ms'n  
  virtual int ExitInstance(); kGpa\c g1  
  //}}AFX_VIRTUAL -jgysBw+Xb  
  //{{AFX_MSG(CHookApp) #&v/icz$  
  // NOTE - the ClassWizard will add and remove member functions here. M(#m0x B  
  // DO NOT EDIT what you see in these blocks of generated code ! u2oKH{/z  
  //}}AFX_MSG |KB0P@=a  
  DECLARE_MESSAGE_MAP() :m86 hBE.  
}; D=:04V}2+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); yC 77c=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); UnVm1ZWZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .@ xF6UZ  
BOOL InitHotkey(); +("7ZK?  
BOOL UnInit(); @ '@:sM_  
#endif gaA<}Tp,  
s9dO,FMs0t  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. `1{N=!U(&  
#include "stdafx.h" vvUSeG\n#j  
#include "hook.h" DAo~8H  
#include <windowsx.h> UAR5^  
#ifdef _DEBUG ycFio ,  
#define new DEBUG_NEW e8YMX&0%  
#undef THIS_FILE m<L;  
static char THIS_FILE[] = __FILE__; rc+C?)S  
#endif 98 8]}{w  
#define MAX_KEY 100 | mu+9   
#define CTRLBIT 0x04 gP+fN$5'd  
#define ALTBIT 0x02 1c JF/"v  
#define SHIFTBIT 0x01 iU6Gp-<M ,  
#pragma data_seg("shareddata") rkiT1YTY  
HHOOK hHook =NULL; Ai D[SR  
UINT nHookCount =0; Fnk_\d6Ma  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey -{^}"N  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ?+T^O?r|O  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey >]o}}KF?  
static int KeyCount =0; .0R v(Y  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \om%Q[F7a  
#pragma data_seg() {3N'D2N  
HINSTANCE hins; =^H4Yck/5  
void VerifyWindow(); eZ"1gYqy  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) cyxuK*x<  
//{{AFX_MSG_MAP(CHookApp) 3\T2?w9u(  
// NOTE - the ClassWizard will add and remove mapping macros here. O;7)Hjwt  
// DO NOT EDIT what you see in these blocks of generated code! f|u#2!7  
//}}AFX_MSG_MAP 7JSNYTH  
END_MESSAGE_MAP() eNiaM6(J  
jA#/Z  
CHookApp::CHookApp() [r/k% <  
{ s;UH]  
 // TODO: add construction code here, hHqh{:q{v  
 // Place all significant initialization in InitInstance Kx_h1{  
} ]Qm]I1P  
wP,JjPUt  
CHookApp theApp; fDx9iHGv  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Mi~(aah  
{ +cU>k}  
 BOOL bProcessed=FALSE; qRbf2;  
 if(HC_ACTION==nCode) 8w({\=  
 { ;gC|  
  if((lParam&0xc0000000)==0xc0000000){// Key up fwzb!"!.@  
   switch(wParam) V.wqZ {G  
   { 64:fs?H  
    case VK_MENU: $%VuSrZ&  
     MaskBits&=~ALTBIT; p}[zt#v  
     break; =_YG#yS  
    case VK_CONTROL: qY 4#V k  
     MaskBits&=~CTRLBIT; $=?@*p  
     break; [pVamE  
    case VK_SHIFT: $ cj>2.   
     MaskBits&=~SHIFTBIT; `K ,1K  
     break; G\NPV'  
    default: //judge the key and send message Zw wqSyuGf  
     break; ^&g=u5 d0  
   } wcDRH)AW.  
   for(int index=0;index<MAX_KEY;index++){ Vb BPB5 $q  
    if(hCallWnd[index]==NULL) u{["50~  
     continue; B c2p(z4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >vo=]c w  
    { y\{%\$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ax 41N25  
     bProcessed=TRUE; M:5b4$Qh<  
    } C* nB  
   } }MUn/ [x  
  } If%/3UJ@  
  else if((lParam&0xc000ffff)==1){ //Key down Z4IgBn(Z_}  
   switch(wParam) '=P7""mN5  
   { 1 hg}(Hix  
    case VK_MENU: JmEj{K<3I  
     MaskBits|=ALTBIT; F:mq'<Q  
     break; 0Ia($.1mY  
    case VK_CONTROL: 7t.!lh5G%  
     MaskBits|=CTRLBIT; ,]b~t0|B  
     break; ZoArQ(YFy  
    case VK_SHIFT: h;3cd0  
     MaskBits|=SHIFTBIT; 3j3N!T9  
     break; &HSq(te  
    default: //judge the key and send message vzmc}y G  
     break; x`6<m!d`  
   } ]vuwkn+)  
   for(int index=0;index<MAX_KEY;index++) r_;9' #&'  
   { /rSH"$  
    if(hCallWnd[index]==NULL) Ks}Xgc\  
     continue; TwgrRtj'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,!U=|c"k)  
    { &IlU|4`R%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); H:"ma S\I  
     bProcessed=TRUE; ul*Qt}  
    } )Pv9_XKJ  
   } }pJwj  
  } "1, pHR-+R  
  if(!bProcessed){ 0T46sm r  
   for(int index=0;index<MAX_KEY;index++){ ;qBu4'C)T  
    if(hCallWnd[index]==NULL) 4 {9B9={  
     continue; awz;z?~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %Z*sU/^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); bu51$s?B  
   } n[(Qr9  
  } +>4;Zd!@d  
 } r;m)nRu  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); f|sFlUu&  
} )aX,%yK  
S6[v;{xJ  
BOOL InitHotkey() >|;aIa@9  
{ MeUaTJFEB  
 if(hHook!=NULL){ @}kv-*  
  nHookCount++; xC tmXo  
  return TRUE; *_?dVhxf  
 } dXnl'pFS  
 else 2=_g f  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); a.z;t8  
  if(hHook!=NULL) Onwp-!!.  
   nHookCount++; @'GGm#<   
  return (hHook!=NULL); ]7e =fM9V;  
} hqRw^2F  
BOOL UnInit() u,6~qQczE  
{ }3?n~s\)6f  
 if(nHookCount>1){ \_B[{e7z  
  nHookCount--; XU"~h64]  
  return TRUE; {GJ@psG*  
 } J(6oL   
 BOOL unhooked = UnhookWindowsHookEx(hHook); L5,NP5RC  
 if(unhooked==TRUE){ 5ls6t{Ci  
  nHookCount=0; -{ZWo:,r~q  
  hHook=NULL; __.+s32SS$  
 } )wNP( @$L  
 return unhooked; A,4fEmWM  
} ){UcS/GI=  
y '!m4-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .?l\g-;=  
{ 8Ac:_Zg  
 BOOL bAdded=FALSE; ~*wk6&|  
 for(int index=0;index<MAX_KEY;index++){ tToTxf~  
  if(hCallWnd[index]==0){ 7nuU^wc  
   hCallWnd[index]=hWnd; AnT3M.>ek  
   HotKey[index]=cKey; |6< p(i7  
   HotKeyMask[index]=cMask; q`r**N+zn  
   bAdded=TRUE; l'eyq}&  
   KeyCount++; 6R^^.tCs  
   break; 8-O)Xx}cU  
  } $*?,#ta  
 } )6aAB|  
 return bAdded; r9dyA5oD  
} G["c\Xux  
w`5xrqt@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) s)pbS}L  
{ Sm5H_m!  
 BOOL bRemoved=FALSE; v\{!THCSh  
 for(int index=0;index<MAX_KEY;index++){ Q 7?#=N?  
  if(hCallWnd[index]==hWnd){ Bs?^2T~%{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ JeE ;V![  
    hCallWnd[index]=NULL; dN$Tf  
    HotKey[index]=0;  E@b(1@  
    HotKeyMask[index]=0; )KAEt.  
    bRemoved=TRUE; GN2Sn` ;  
    KeyCount--; lg&t8FHa;  
    break; pfI"36]F  
   } Nal9M[]c  
  } jB(|";G  
 } 9B9(8PVG  
 return bRemoved; 5^x1cUB]  
} y_?Me]  
j?+X\PtQ  
void VerifyWindow() -jiG7OL  
{ OtNd,U.dE  
 for(int i=0;i<MAX_KEY;i++){ 2=^m9%  
  if(hCallWnd!=NULL){ n<u $=H  
   if(!IsWindow(hCallWnd)){ f=9|b  
    hCallWnd=NULL; qXwPDq/  
    HotKey=0; r% +V8o  
    HotKeyMask=0; pS7w' H  
    KeyCount--; aYSCw 3C<  
   } t)}scf&^x  
  } _/tHD]um  
 } 9c("x%nLpB  
} tw9f%p  
l~$+,U&XNe  
BOOL CHookApp::InitInstance() B]l)++~  
{ y9Usn8  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 5yz(>EVH  
 hins=AfxGetInstanceHandle(); _BP&n  
 InitHotkey(); ;N?]eM}yf  
 return CWinApp::InitInstance(); p|p l  
} 53n^3M,qK  
U3dwI:cG  
int CHookApp::ExitInstance() K>@+m  
{ Ptdpj)oi&Q  
 VerifyWindow(); L}pt)w*V1j  
 UnInit(); W@I|Q -  
 return CWinApp::ExitInstance(); Zo~  
} @P?~KW6<|  
XY3v_5~/1F  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ZNvEW  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) "9Q40w\  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ]%u@TK7  
#if _MSC_VER > 1000 K42K!8$  
#pragma once @W"KVPd  
#endif // _MSC_VER > 1000 VG ;kPzze  
][p>Y>:b-  
class CCaptureDlg : public CDialog d\gJ$ ~^K  
{ B e0ND2oo  
 // Construction _dhgAx-H)h  
 public: #;2n;.a  
  BOOL bTray; CmoE _8U>  
  BOOL bRegistered; /^#;d UB  
  BOOL RegisterHotkey(); {C N~S*m  
  UCHAR cKey; 4?q <e*W  
  UCHAR cMask; >]vlkA(  
  void DeleteIcon(); 2OVRf0.R~  
  void AddIcon(); )x=1]T>v"'  
  UINT nCount; vkEiOFU!u  
  void SaveBmp(); sW'2+|3"  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor +Z !)^j  
  // Dialog Data ;"~ fZ2$U  
  //{{AFX_DATA(CCaptureDlg) x#xFh0CA  
  enum { IDD = IDD_CAPTURE_DIALOG }; :Ra,Eu  
  CComboBox m_Key; =*c7i]@}  
  BOOL m_bControl; .7avpOfz  
  BOOL m_bAlt; A#J`;5!Sc  
  BOOL m_bShift; lHPd"3HDK  
  CString m_Path; SPY|K  
  CString m_Number; Ssou  
  //}}AFX_DATA dQA'($  
  // ClassWizard generated virtual function overrides !u[eaLxV  
  //{{AFX_VIRTUAL(CCaptureDlg) +b3RkkC  
 public: &&8IU;J  
  virtual BOOL PreTranslateMessage(MSG* pMsg); `n @*{J8  
 protected: 6"J? #  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ijK"^4i  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); < (fRn`)PT  
  //}}AFX_VIRTUAL R?"q]af~  
  // Implementation pUQ/03dp  
 protected: p;3O#n-_  
  HICON m_hIcon; `-J%pEIza  
  // Generated message map functions ZJzt~ H  
  //{{AFX_MSG(CCaptureDlg) L>aLqQ3  
  virtual BOOL OnInitDialog(); _ 4U5  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?kH8Lw~{5W  
  afx_msg void OnPaint(); DpvI[r//'*  
  afx_msg HCURSOR OnQueryDragIcon(); L(|N[#  
  virtual void OnCancel(); e]$}-i@#  
  afx_msg void OnAbout(); 1Vrh4g.l  
  afx_msg void OnBrowse(); y[)>yq y  
  afx_msg void OnChange(); ?R$F)g7<  
 //}}AFX_MSG jD<{t  
 DECLARE_MESSAGE_MAP() uXJ;A *  
}; /-_h1.!   
#endif )f[ B6Y  
IYS)7`{]  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file SwTL|+u  
#include "stdafx.h" }J:U=HJ  
#include "Capture.h" ,*&:2o_r  
#include "CaptureDlg.h" _u5#v0Y  
#include <windowsx.h> Mb|a+,:>3  
#pragma comment(lib,"hook.lib") :toh0oB[  
#ifdef _DEBUG p6#g;$V$  
#define new DEBUG_NEW i1NY9br  
#undef THIS_FILE 6;\I))"[  
static char THIS_FILE[] = __FILE__; (a.z9nqGA  
#endif w[zjerH3  
#define IDM_SHELL WM_USER+1 =hC,@R>;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -pf}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 59Xi3KY  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; (_mnB W  
class CAboutDlg : public CDialog N`5,\TR2f  
{ )NXmn95  
 public: cdl&9-}  
  CAboutDlg(); Zw5Ni Xj  
  // Dialog Data bpJ(XN}E  
  //{{AFX_DATA(CAboutDlg) ;g5m0l5  
  enum { IDD = IDD_ABOUTBOX }; Ln')QN  
  //}}AFX_DATA t{^*6XOcJ  
  // ClassWizard generated virtual function overrides |ef7bKU8  
  //{{AFX_VIRTUAL(CAboutDlg) eTI%^d|  
 protected: aQ?/%\>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \r^qL^  
  //}}AFX_VIRTUAL }Gz~nf%  
  // Implementation DS.RURzd{r  
 protected: A}G7l?V&  
  //{{AFX_MSG(CAboutDlg) dMf:h"7  
  //}}AFX_MSG CrC^1K  
  DECLARE_MESSAGE_MAP() ]@j*/IP  
}; S;3R S;  
BP'36?=Zo  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) =9'RM>  
{ 9YIM'q>`v  
 //{{AFX_DATA_INIT(CAboutDlg) 8uc1iB  
 //}}AFX_DATA_INIT u]<,,  
} 5nv#+ap1 "  
@r/#-?W  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) :)wy.r;N  
{ ieDk;  
 CDialog::DoDataExchange(pDX); \r;#g{ _  
 //{{AFX_DATA_MAP(CAboutDlg) |oH,   
 //}}AFX_DATA_MAP #%a;"w  
} N..yQ-6x?  
&zl|87M  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) twL3\ }N/B  
 //{{AFX_MSG_MAP(CAboutDlg) <k eVrCR  
 // No message handlers nhB1D-  
 //}}AFX_MSG_MAP gp};D  
END_MESSAGE_MAP() 8;b( 0^  
m ,* QP*  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) \\PjKAsh  
: CDialog(CCaptureDlg::IDD, pParent) $UMFNjL  
{ Ygm`ZA y  
 //{{AFX_DATA_INIT(CCaptureDlg) eJF5n#  
  m_bControl = FALSE; 8p^bD}lN7  
  m_bAlt = FALSE; cv-PRH#  
  m_bShift = FALSE; XX7{-Y y  
  m_Path = _T("c:\\"); {@H6HqD  
  m_Number = _T("0 picture captured."); yzbx .  
  nCount=0; CJ/X}hi,  
  bRegistered=FALSE; x5,++7Tz  
  bTray=FALSE; 9_# >aOqL  
 //}}AFX_DATA_INIT 7`- Zuf  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 J`peX0Stl  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 3 R=,1<  
} `YFtL  
m!|kW{B#A  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 5L+>ewl  
{ oRm L {UDZ  
 CDialog::DoDataExchange(pDX); 0LPig[  
 //{{AFX_DATA_MAP(CCaptureDlg) 5gb|w\N>  
  DDX_Control(pDX, IDC_KEY, m_Key); v~f HYa>  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); A;;fACF8e  
  DDX_Check(pDX, IDC_ALT, m_bAlt); F3N?Nk/  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); oibsh(J3  
  DDX_Text(pDX, IDC_PATH, m_Path); p#ol*m5wE  
  DDX_Text(pDX, IDC_NUMBER, m_Number); bZnuNYty75  
 //}}AFX_DATA_MAP mC4zactv  
} e}D3d=6`  
S@jQX  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) K,Ef9c/+K  
//{{AFX_MSG_MAP(CCaptureDlg) hEA<o67  
 ON_WM_SYSCOMMAND() I?h)OvWd  
 ON_WM_PAINT() :By?O"LQ  
 ON_WM_QUERYDRAGICON() L6t+zIUc-~  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Vi>,kF.f V  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) TTeH `  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 8;d:-Cp  
//}}AFX_MSG_MAP {'XggI%  
END_MESSAGE_MAP() R?GDJ3  
\kp8S'qVo  
BOOL CCaptureDlg::OnInitDialog() 6 bomh2  
{ X@$f$=  
 CDialog::OnInitDialog(); j2Cks_$:  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8|):`u  
 ASSERT(IDM_ABOUTBOX < 0xF000); > A Khf  
 CMenu* pSysMenu = GetSystemMenu(FALSE); $Z!`Hb  
 if (pSysMenu != NULL) <>dT64R|  
 { .R) D3NZp  
  CString strAboutMenu; j|4<i9^}  
  strAboutMenu.LoadString(IDS_ABOUTBOX); m4TE5q%3  
  if (!strAboutMenu.IsEmpty()) R}G4rO-J  
  { ebm])~ZL  
   pSysMenu->AppendMenu(MF_SEPARATOR); Uddr~2%(  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); p31NIf `  
  } >sfRI]OG  
 } whmdcVh.  
 SetIcon(m_hIcon, TRUE); // Set big icon n(b(yXYm]  
 SetIcon(m_hIcon, FALSE); // Set small icon 4~k\j  
 m_Key.SetCurSel(0); 6DM$g=/ '  
 RegisterHotkey(); d:ARf  
 CMenu* pMenu=GetSystemMenu(FALSE); 2"0es40;0  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); K0H'4' I  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); NE"@Bk cm  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); I3=%h  
 return TRUE; // return TRUE unless you set the focus to a control ge,H-8'Z  
} $:cE ^8K  
 tR}MrM  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) I~q#eO)  
{ r;/4F/6"  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) {%<OD8>p  
 { oo,uO;0G  
  CAboutDlg dlgAbout; Uo-)pFN^  
  dlgAbout.DoModal(); iWRH{mK  
 } $h5xH9x ;  
 else M=%l}FSTw(  
 { t0/p]=+.p/  
  CDialog::OnSysCommand(nID, lParam); XF Patd  
 } UM!ENI|  
} VbJiZw(aR  
~o82uw?  
void CCaptureDlg::OnPaint() ~c8? >oN(  
{ K-e9>fmB#  
 if (IsIconic()) sc|_Q/`\.  
 { o]+z)5zC  
  CPaintDC dc(this); // device context for painting 3[\iQ*d }B  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 1QqYQafA  
  // Center icon in client rectangle 8B7cBkl:  
  int cxIcon = GetSystemMetrics(SM_CXICON); +vYoB$!  
  int cyIcon = GetSystemMetrics(SM_CYICON); e&simX;W  
  CRect rect; *v;!-F&8>  
  GetClientRect(&rect); 2VF%@p  
  int x = (rect.Width() - cxIcon + 1) / 2; B268e  
  int y = (rect.Height() - cyIcon + 1) / 2; FYOD Upn  
  // Draw the icon , `wXg  
  dc.DrawIcon(x, y, m_hIcon); us ;YV<)d  
 } y)F;zW<+  
 else ~res V  
 { <A<{,:5C  
  CDialog::OnPaint(); (hTCK8HK  
 } x4g3 rmp  
} NS9B[*"Jl  
wHsYF`  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3Vsc 9B"w  
{ dA-2%uJ  
 return (HCURSOR) m_hIcon; nIAx2dh?  
} 8yRJD[/S  
m$`RcwO  
void CCaptureDlg::OnCancel() 6Se?sHC>  
{ R?v>Q` Qi  
 if(bTray) CEXyrs<  
  DeleteIcon(); ,/YF-L$(t  
  CDialog::OnCancel(); BS /G("oZ[  
} ^g*pGrl#  
4oK?-|=?  
void CCaptureDlg::OnAbout() .clP#r{U  
{ vh"R'o  
 CAboutDlg dlg; *Nw&_<\9Q  
 dlg.DoModal(); LG-y]4a}  
} ~1cnE:x;V  
$@sEn4h  
void CCaptureDlg::OnBrowse() R#xCkl-  
{ UQ8M~x5$3%  
 CString str; `k OD[*  
 BROWSEINFO bi; sqla}~CiX  
 char name[MAX_PATH]; 'HT7_$?*  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); P.6nA^hXB  
 bi.hwndOwner=GetSafeHwnd(); 5 elw~u  
 bi.pszDisplayName=name; E_Im^a  
 bi.lpszTitle="Select folder"; 6^%UU o%  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; LL]zT H0  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); qgE 73.!`6  
 if(idl==NULL) wDcj,:h`  
  return; 4S,`bnmB  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ^cV;~&|.Xk  
 str.ReleaseBuffer(); $>*3/H  
 m_Path=str; _Bj)r}~7#  
 if(str.GetAt(str.GetLength()-1)!='\\') `o<' x.I  
  m_Path+="\\"; =2[7 E  
 UpdateData(FALSE); EzDk}uKY0R  
} r9X?PA0f  
Ae mDJ8Y  
void CCaptureDlg::SaveBmp() JQ}$Aqk  
{ dODt(J}%  
 CDC dc; #@^t;)|  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Q&MZN);.  
 CBitmap bm; 0*%Z's\M"  
 int Width=GetSystemMetrics(SM_CXSCREEN); qi;f^9M%  
 int Height=GetSystemMetrics(SM_CYSCREEN); OH;b"]  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Rz (QC\(  
 CDC tdc; P6!jRC"52'  
 tdc.CreateCompatibleDC(&dc); &L#UGp $,  
 CBitmap*pOld=tdc.SelectObject(&bm); .zS?9MP  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 8*8Zc/{  
 tdc.SelectObject(pOld); pF&(7u  
 BITMAP btm; pcau}5 .  
 bm.GetBitmap(&btm); 9v?N+Rb  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; LAVAFlK5  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;w:M`#2  
 BITMAPINFOHEADER bih; Sczc5FG  
 bih.biBitCount=btm.bmBitsPixel; UQ'\7OS  
 bih.biClrImportant=0; #~SP)Ukp  
 bih.biClrUsed=0; 8dV=[+  
 bih.biCompression=0; /<E5"Mm%  
 bih.biHeight=btm.bmHeight; Ge,;8N88  
 bih.biPlanes=1; Xua+cVc\y  
 bih.biSize=sizeof(BITMAPINFOHEADER); !vX D  
 bih.biSizeImage=size; yMyE s8  
 bih.biWidth=btm.bmWidth; 7G.#O}).b  
 bih.biXPelsPerMeter=0; *&?c(JU;<  
 bih.biYPelsPerMeter=0; HU%o6cw  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); /b]oa !  
 static int filecount=0; vLR~'" `F  
 CString name; q2. XoCf  
 name.Format("pict%04d.bmp",filecount++); ~GTz:nC*  
 name=m_Path+name; u@~JiiC%  
 BITMAPFILEHEADER bfh; n9@ of  
 bfh.bfReserved1=bfh.bfReserved2=0; f~Fm4 >\(  
 bfh.bfType=((WORD)('M'<< 8)|'B'); $wmvKQc{lx  
 bfh.bfSize=54+size; D!.[q-<  
 bfh.bfOffBits=54; ()K " c#  
 CFile bf; " Om[~-31  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Y3r%B9~  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ObLly%|i  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); U Z.=aQ}M  
  bf.WriteHuge(lpData,size); (rkyWz  
  bf.Close(); V2$h8\a  
  nCount++; CLeG<Hi ~  
 } 1&^MfP}  
 GlobalFreePtr(lpData); d@ Y}SWTB  
 if(nCount==1) )jkXS TZ  
  m_Number.Format("%d picture captured.",nCount); dYSr4p b  
 else \cC%!4  
  m_Number.Format("%d pictures captured.",nCount); I?"q/Ub~h  
  UpdateData(FALSE); Ul2R'"FB  
} d*A*y^OD  
la( <8  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) T32+3wb"I  
{ gN24M3{C  
 if(pMsg -> message == WM_KEYDOWN) [ j3&/  
 { f@8>HCI  
  if(pMsg -> wParam == VK_ESCAPE) Vl_:c75"  
   return TRUE; }@Ge}9$ h  
  if(pMsg -> wParam == VK_RETURN) &krwf ]|  
   return TRUE; 0@G")L Ue0  
 } a;QMA d!  
 return CDialog::PreTranslateMessage(pMsg); rA2 g&  
} 6b%WHLUeT  
^xh}I5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .mDM[e@'  
{ rF aF Bd  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 9so6WIWc  
  SaveBmp(); <Ard 7UT  
  return FALSE; `D`sr[3n  
} [[>wB[w  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ x%+aKZ(m)  
 CMenu pop; ?_"+^R z  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); j7sKsbb  
 CMenu*pMenu=pop.GetSubMenu(0); U>V&-kxtV  
 pMenu->SetDefaultItem(ID_EXITICON); >=UF-xk;  
 CPoint pt; w=LP"bqlI  
 GetCursorPos(&pt); _^el\  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); tj Gd )  
 if(id==ID_EXITICON) OR}c)|1  
  DeleteIcon(); H|R T?Q  
 else if(id==ID_EXIT)  PZ{Dv'C  
  OnCancel(); KN7^:cC  
 return FALSE; FDVcow*]n  
} l5\"9 ,<  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); UNPezHaz  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 2zVJvn7  
 AddIcon(); Bn61AFy`  
 return res; ,hq)1u  
} AZa 6 C w  
Kv.>Vf.T}_  
void CCaptureDlg::AddIcon() .so[I  
{ q4}PM[K?=\  
 NOTIFYICONDATA data; T:/,2.l  
 data.cbSize=sizeof(NOTIFYICONDATA); 3 n'V\H vz  
 CString tip; M7ers|&{  
 tip.LoadString(IDS_ICONTIP); 0PU8 #2pR  
 data.hIcon=GetIcon(0); ([-|}  
 data.hWnd=GetSafeHwnd(); qZ}P*+`Q  
 strcpy(data.szTip,tip); deM7fN4lTi  
 data.uCallbackMessage=IDM_SHELL; aYuD>rD  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; %z#f.Ql  
 data.uID=98; OiE;B  
 Shell_NotifyIcon(NIM_ADD,&data); ]UH`Pdlt  
 ShowWindow(SW_HIDE); Si_%Rr&jW  
 bTray=TRUE; &VV~%jl;k  
} P( XaTU&-  
ccLq+a|  
void CCaptureDlg::DeleteIcon() 9G{;?c  
{ *xON W  
 NOTIFYICONDATA data; Pu"R,a  
 data.cbSize=sizeof(NOTIFYICONDATA); X{we/'>  
 data.hWnd=GetSafeHwnd(); E2cB U{x  
 data.uID=98; PH> b-n  
 Shell_NotifyIcon(NIM_DELETE,&data); \3'9Uz,OC  
 ShowWindow(SW_SHOW); aX~%5 mF  
 SetForegroundWindow(); AX= 1b,s  
 ShowWindow(SW_SHOWNORMAL); 3t<a $i  
 bTray=FALSE; Y`o+XimX  
} !-N6l6N  
X66VU  
void CCaptureDlg::OnChange() ]d a^xWK  
{ INkD=tX  
 RegisterHotkey(); ?Y:8eD"*  
} ={5#fgK>  
lW(px^&IN  
BOOL CCaptureDlg::RegisterHotkey() c>/. ;p  
{ ~v'3"k6  
 UpdateData(); UTf9S>HS  
 UCHAR mask=0; #]#sGmW/L  
 UCHAR key=0; "TUe%o  
 if(m_bControl) Kx=4~  
  mask|=4; :$_6SQ<?  
 if(m_bAlt) H}H7lO  
  mask|=2; N nk@h  
 if(m_bShift) mcn 2Wt  
  mask|=1; m=:4`_0Q  
  key=Key_Table[m_Key.GetCurSel()]; e|&6$A>4]  
 if(bRegistered){ `5~ +,/Ys  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); $2M#qkik-  
  bRegistered=FALSE; /DqLrA  
 } 4#5:~M }  
 cMask=mask; w.lAQ5)I%\  
 cKey=key; =xNv\e  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Q>R>R*1.j  
 return bRegistered; F29v a  
} E@-KGsdhK  
%e`$p=m  
  四、小结 5Q 'i2*j  
59zENUYl  
  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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