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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: 0%b !ARix  
  jFwu&e[9;  
  一、实现方法 Frd`u .I  
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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: -NL=^O$G  
y/\0qQ/  
#pragma data_seg("shareddata") ^dP]3D1 @  
HHOOK hHook =NULL; //钩子句柄 4^u wZ:  
UINT nHookCount =0; //挂接的程序数目 )"sJaHx<  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 G>?'b  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 6jpfo'uB$  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey +j!$88%Z{  
static int KeyCount =0; $Ao iH{f  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 yM`QVO!;  
#pragma data_seg() e'MLLC [  
OY'6~w9  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 yq]/r=e!k  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 47yzI-1H+  
<)4>"SN&^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR mgL{t"$c  
cKey,UCHAR cMask) V =-hqo(  
{ (V:)`A_-  
 BOOL bAdded=FALSE; +h?Rb3=S  
 for(int index=0;index<MAX_KEY;index++){ 8;+dlWp  
  if(hCallWnd[index]==0){ _WB*ArR  
   hCallWnd[index]=hWnd; CWx_9b zk  
   HotKey[index]=cKey; 0m>?-/uDx  
   HotKeyMask[index]=cMask; o7^u@*"F  
   bAdded=TRUE; c[zaYcbl  
   KeyCount++; qV&ai{G:  
   break; _fmOTz G  
  } 9zac[t no  
 } J=7<dEm&  
 return bAdded; f J$>VN  
} =+>^:3cCQ  
//删除热键 E7AYK&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -s,guW |  
{ &O;' ?/4 S  
 BOOL bRemoved=FALSE; %YV3-W8S0  
 for(int index=0;index<MAX_KEY;index++){ m14OPZ<3?-  
  if(hCallWnd[index]==hWnd){ %5-   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ A"pV 7 y  
    hCallWnd[index]=NULL; LPK[^  
    HotKey[index]=0; T.B} k`$  
    HotKeyMask[index]=0; *R8qnvE\()  
    bRemoved=TRUE; .~jn N  
    KeyCount--; 6,j&u7  
    break; Hr/3nq}.  
   } AiOz1Er  
  } 68YJ@(iS  
 } y>iote~  
 return bRemoved; ^,,lo<d_L  
} %LZ-i?DL4Q  
3lG=.yD  
!^_G~`r$2J  
  DLL中的钩子函数如下:  Zzea  
t#sw{RO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?CHFy2%Y  
{ )uxXG `,h  
 BOOL bProcessed=FALSE; y - Ge"mY  
 if(HC_ACTION==nCode) e(~Y!:Q#O  
 { 6"PwOEt  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 0{zA6Xu  
   switch(wParam) 3X]\p}]z  
   {  :j4i(qcF  
    case VK_MENU: t}A n:  
     MaskBits&=~ALTBIT; ;&?l1Vu  
     break; :^ *9E b  
    case VK_CONTROL: avwhGys#  
     MaskBits&=~CTRLBIT; ;y%C\YB#  
     break; HS[N]'dc  
    case VK_SHIFT: t]PO4GA  
     MaskBits&=~SHIFTBIT; UCDvN  
     break; ]CZ&JL  
    default: //judge the key and send message ZW>?y$C+  
     break; {H$m1=S  
   } }Pf7YuUZZ  
   for(int index=0;index<MAX_KEY;index++){ 69K*]s  
    if(hCallWnd[index]==NULL) aVbv.>  
     continue; 9_5tA'Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Wzx Dnd<B  
    { 50J"cGs~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Q?"-[6[v  
     bProcessed=TRUE; XF=GmkO  
    } F G5e{  
   } o;<oXv  
  } :.%Hu9=GL  
  else if((lParam&0xc000ffff)==1){ //有键按下 &f$[>yg1-  
   switch(wParam) SYZS@o  
   { 6yRxb (  
    case VK_MENU: W$_@9W(Bl  
     MaskBits|=ALTBIT; Tx!c }  
     break; i[x;k;m2q  
    case VK_CONTROL: i~04P  
     MaskBits|=CTRLBIT; ~e@pL*s  
     break; +w'{I`QIL0  
    case VK_SHIFT: jhmWwT/O8^  
     MaskBits|=SHIFTBIT; *[?DnF+  
     break; n^m6m%J)  
    default: //judge the key and send message M.QXwIT  
     break; _O*"_^6  
   } JkMf+ !  
   for(int index=0;index<MAX_KEY;index++){ Mk"V%)1k  
    if(hCallWnd[index]==NULL) 2~BId&]  
     continue; &:ib>EB03=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9azk(OL6  
    { #7~i.8L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); cr_Q,*  
     bProcessed=TRUE; rBUdHd9  
    } 'G-zJcU  
   } *=O~TY<](  
  } std4Nyp  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 sG~5O\,E  
   for(int index=0;index<MAX_KEY;index++){ u  teI[Q  
    if(hCallWnd[index]==NULL) 5lMm8<v  
     continue; .sk$@Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) TXlxnB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6 NJ5v +  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 I 8 \Ka=w  
   } Wi?37EHr  
  } h) . ([  
 } 5YG?m{hyn_  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [|\JIr=of5  
} @pKQ}?  
#sq$i  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: oKJj?%dHK9  
K8l|qe  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W&U Nk,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); aiKZ$KLC  
b]NSCu*)s  
  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: 6BJPQdqSl  
%-6I  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5$e|@/(0  
{ GCUzKf&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) W:7oGZ>4  
 { hoc$aqP6pp  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ^]$x/1I;  
  SaveBmp(); 76\ir<1up  
  return FALSE; ^fLePsmd  
 } J/j?;qx]j  
 …… //其它处理及默认处理 Xw=>L#Q  
} DFz,>DM;  
oXc!JZ^  
L//Z\xr|  
  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。 $f-f0t'  
B?nQUIb:  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 }' mBqn  
A3p@hQl  
  二、编程步骤 t&SC>8M<  
l)glT]G3+  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; t]~L o3  
`5[d9z/6  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; HXTBxh  
[lqwzW{(UN  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; '*5I5'[ X,  
LFCcV<~  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; o yBBW?m  
;~$_A4;  
  5、 添加代码,编译运行程序。 Hb KJ&^  
gL(ny/Ob9  
三、程序代码 &i8AB{OU  
Y. ]FVq  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 4+od N.  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) G SXe=?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ /RuGh8qzP  
#if _MSC_VER > 1000  iK$)Iy0  
#pragma once 'b#`8k~>  
#endif // _MSC_VER > 1000 ysV0Ed  
#ifndef __AFXWIN_H__ k[]B P4  
#error include 'stdafx.h' before including this file for PCH %X Jv;|  
#endif zo-hH8J:  
#include "resource.h" // main symbols Bf$YwoZov  
class CHookApp : public CWinApp Vf#X[$pc/  
{ W>Eee?  
 public: #YM5P  
  CHookApp(); [V~(7U  
  // Overrides /R&!92I0*  
  // ClassWizard generated virtual function overrides y#5xS  
  //{{AFX_VIRTUAL(CHookApp) #Mt'y8|}$  
 public: ugEh}3  
  virtual BOOL InitInstance(); bwG2=  
  virtual int ExitInstance(); ^[no Gjy  
  //}}AFX_VIRTUAL 84UH& b'n  
  //{{AFX_MSG(CHookApp) G};os+FxF  
  // NOTE - the ClassWizard will add and remove member functions here. _\YBB=Os  
  // DO NOT EDIT what you see in these blocks of generated code ! 05mjV6j7m  
  //}}AFX_MSG gnW `|-:\  
  DECLARE_MESSAGE_MAP() <=A1d\   
}; :b[ [}'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 8<C u S  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RU3:[ (7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); WG8}}`F|  
BOOL InitHotkey(); LfEeFF=#n  
BOOL UnInit(); 5w)tsGX\  
#endif e`%U}_[d  
@vdBA hXk  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 'c3P3`o,;  
#include "stdafx.h" UI}v{05]  
#include "hook.h" :?%$={m  
#include <windowsx.h> sK8=PZ \  
#ifdef _DEBUG n=#AH;42  
#define new DEBUG_NEW V&U1WV/  
#undef THIS_FILE Vp*#,(_G:  
static char THIS_FILE[] = __FILE__; i>YD_#w  
#endif *HFRG)[V  
#define MAX_KEY 100 q~68)D(  
#define CTRLBIT 0x04 CM+Nm(|\,  
#define ALTBIT 0x02 T u>5H`  
#define SHIFTBIT 0x01 DT`TA#O  
#pragma data_seg("shareddata") +G';no\h  
HHOOK hHook =NULL; `iYiAc  
UINT nHookCount =0; 0b%"=J2/p.  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey {3F;:%$`c  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 45` i  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~0"(C#l 9  
static int KeyCount =0; jj2 [Zh/h  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift +;uP) "Q/L  
#pragma data_seg() e^)+bmh  
HINSTANCE hins; N t]YhO  
void VerifyWindow(); 8yEN)RqI  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 64Gd^.Z  
//{{AFX_MSG_MAP(CHookApp) qRkY-0vBP  
// NOTE - the ClassWizard will add and remove mapping macros here. 'NyIy:  
// DO NOT EDIT what you see in these blocks of generated code! x%Ph``XI  
//}}AFX_MSG_MAP 7\>P@s  
END_MESSAGE_MAP() b^[Ab:`}[V  
~.99H  
CHookApp::CHookApp() qPeaSv]W  
{ fYrC;&n  
 // TODO: add construction code here, @X@?jj&  
 // Place all significant initialization in InitInstance Y ;$wD9W  
} {"T$j V:GB  
$VOSd<87  
CHookApp theApp; P;_}nbB  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) t*H r(|.  
{ FCL7Tn  
 BOOL bProcessed=FALSE; &)[?D<  
 if(HC_ACTION==nCode) N>kY$*  
 { 1h uU7xuf  
  if((lParam&0xc0000000)==0xc0000000){// Key up THC7e>P4  
   switch(wParam) G`H4#@]  
   { ] TY$  
    case VK_MENU: dm8N;r/w  
     MaskBits&=~ALTBIT; Dv~W!T i  
     break; d:C|laZHn  
    case VK_CONTROL: 1t&LNIc|^  
     MaskBits&=~CTRLBIT; a6\0XVU  
     break; N 4Kj)E@  
    case VK_SHIFT: 2d),*Cvf  
     MaskBits&=~SHIFTBIT; nn[OC=cDN  
     break; NWnUXR  
    default: //judge the key and send message {k BHZ$/  
     break; T<:mG%Is  
   } 9e5XS\  
   for(int index=0;index<MAX_KEY;index++){ je_:hDr  
    if(hCallWnd[index]==NULL) = BcKWC  
     continue; []^fb,5a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <'WS -P%U  
    { M_ *KA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); S7i,oP7  
     bProcessed=TRUE; 8EbJ5wu/%S  
    } ?|4Y(0N  
   } 'cp1I&>  
  } CK[w0VCT  
  else if((lParam&0xc000ffff)==1){ //Key down ,#n$YT7  
   switch(wParam) N@}5Fnk-  
   { 90g=&O5@O  
    case VK_MENU: <}Hfu-PLo  
     MaskBits|=ALTBIT; 1jHugss9|  
     break; p>Z18  
    case VK_CONTROL: ,xcm:; &  
     MaskBits|=CTRLBIT; KHnq%#  
     break; tqo k.h  
    case VK_SHIFT: f/"? (7F  
     MaskBits|=SHIFTBIT; }Pi}? 41!  
     break; M N-j$-y}  
    default: //judge the key and send message Sq<ds}o'8l  
     break; ;og[ q  
   } olA 1,8  
   for(int index=0;index<MAX_KEY;index++) m2sf]-?Y  
   { ^@91BY  
    if(hCallWnd[index]==NULL) Hs9; &C  
     continue; 'xK ,|U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7-#R[8S  
    { IOL5p*:gz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 79HKfG2+KB  
     bProcessed=TRUE; lftT55Tki  
    } Qqm$Jl!  
   } 9:\#GOg  
  } \eH`{Z'.x5  
  if(!bProcessed){ vZ6_/ew8  
   for(int index=0;index<MAX_KEY;index++){ Al93x  
    if(hCallWnd[index]==NULL) e-&0f);i  
     continue; |.]g&m)y^h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) &];:uYmMU  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); T)CEcz  
   } 5~ip N/)E  
  } }Bk>'  
 } @#u'z ~a)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :`Sd5b>  
} +HAd=DU  
[B_(,/?  
BOOL InitHotkey() &$H7vdWNy  
{ RyuI2jEy  
 if(hHook!=NULL){ NzBX2  
  nHookCount++; 0&21'K)pW  
  return TRUE; z5tOsU  
 } (Ts#^qC  
 else zn+5pn&?  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); rl__3q  
  if(hHook!=NULL) ;o#wK>pk%M  
   nHookCount++; .&Ik(792Z&  
  return (hHook!=NULL); .\rJ|HpZ1J  
} 1yK=Yf%B  
BOOL UnInit() ,qUOPW?=  
{ |g`:K0BI  
 if(nHookCount>1){ AQ<2 "s  
  nHookCount--; 'uBagd>*  
  return TRUE; W{!Slf  
 } gH u!~l  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Au"7w=G`f  
 if(unhooked==TRUE){ C@F3iwTtp  
  nHookCount=0; EJByYk   
  hHook=NULL; M[:},?ah0  
 } [&MhAzF  
 return unhooked; hLo'q^mGr  
} B[IqLD'6  
Z*Lv!6WS  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) o0 &pSCK  
{ .E/NlGm[  
 BOOL bAdded=FALSE; cedH#;V!j  
 for(int index=0;index<MAX_KEY;index++){ ]"X} FU  
  if(hCallWnd[index]==0){ p E56CM  
   hCallWnd[index]=hWnd; [g Y.h/  
   HotKey[index]=cKey; 4*9WxhJ ]0  
   HotKeyMask[index]=cMask; 6 _n~E e  
   bAdded=TRUE; b!l/O2 G  
   KeyCount++; Jc9BZ`~i  
   break; 3:B4;  
  } _/pdZM,V  
 } %YLyh?J  
 return bAdded; u.!<)VIJx  
} 8]2j*e0xV  
^`f( Pg!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) q% pjY  
{ /4{.J=R}  
 BOOL bRemoved=FALSE; -;s-*$I  
 for(int index=0;index<MAX_KEY;index++){ ^2<nn op  
  if(hCallWnd[index]==hWnd){ R![)B97^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \!J9|  
    hCallWnd[index]=NULL; ] RLEyDB  
    HotKey[index]=0; _[p@V_my  
    HotKeyMask[index]=0; O{&wqV5m"  
    bRemoved=TRUE; -Izc-W  
    KeyCount--; Xhk_h2F[  
    break; nNP{>\x;"  
   } k<.VR"I p  
  } @'lO~i  
 } no UXRQ  
 return bRemoved; 8 aC]" C  
} qJ5gdID1_  
*<IQ+oat,a  
void VerifyWindow() DcmRb/AP*  
{ 48W-Tf6v|  
 for(int i=0;i<MAX_KEY;i++){ 5#}wI~U;  
  if(hCallWnd!=NULL){ $?Yw{%W  
   if(!IsWindow(hCallWnd)){ A6AIkKjzq  
    hCallWnd=NULL; 15U[F0b  
    HotKey=0; >&DNxw  
    HotKeyMask=0; @;P\`[(*  
    KeyCount--; 3`^NaQ  
   } Q VJvuiUh  
  } H'2Un(#Al  
 } eGW~4zU  
} RxrUnMF  
?6>rQ6tBv  
BOOL CHookApp::InitInstance() jb {5   
{ "PtOe[Xk  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 9xZ?}S:d  
 hins=AfxGetInstanceHandle(); (U@uJ  
 InitHotkey(); S /)J<?<b  
 return CWinApp::InitInstance(); *s}j:fJ  
} r<XlIi  
I]B[H6  
int CHookApp::ExitInstance() 0ofl,mXW  
{ t^(#~hx  
 VerifyWindow(); [R9!Tz  
 UnInit(); EC0M0qQ  
 return CWinApp::ExitInstance(); u4,b%h.  
} @"$rR+r'  
Ymr\8CG/  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >x 6$F*:W}  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) J6m(\o  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ )9mUE*[  
#if _MSC_VER > 1000 %. -nZC  
#pragma once R`F8J}X_  
#endif // _MSC_VER > 1000 .|Bmg6g*  
[ Cu3D  
class CCaptureDlg : public CDialog A Q e~F  
{ ja|XFs~  
 // Construction "RG #e +  
 public: y+D"LeCAad  
  BOOL bTray; 3V2w1CERE  
  BOOL bRegistered; j"Vb8}  
  BOOL RegisterHotkey(); 9CW8l0  
  UCHAR cKey; ; rJ  
  UCHAR cMask; WKB@9Vfju  
  void DeleteIcon(); /naGn@m5u  
  void AddIcon(); #Ies yNKZ  
  UINT nCount; 9e xHR&>{  
  void SaveBmp(); i@|.1dWh  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor xgQ]#{ tG  
  // Dialog Data |Sf` Cs  
  //{{AFX_DATA(CCaptureDlg) VtJy0OGcRP  
  enum { IDD = IDD_CAPTURE_DIALOG }; T.j&UEsd  
  CComboBox m_Key; g0~3;y  
  BOOL m_bControl; !s:v UY58  
  BOOL m_bAlt; H%:u9DlEK/  
  BOOL m_bShift; <(<19t5.  
  CString m_Path; B%e#u.'6  
  CString m_Number; %M_5C4&6  
  //}}AFX_DATA B,dHhwO*l  
  // ClassWizard generated virtual function overrides +iL,8eW  
  //{{AFX_VIRTUAL(CCaptureDlg) 05>xQx?"m4  
 public: FII>6c  
  virtual BOOL PreTranslateMessage(MSG* pMsg); R.+yVO2  
 protected: {<_9QAS  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iTq~ ^9G  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); .Iret :  
  //}}AFX_VIRTUAL !agtgS$qII  
  // Implementation /\B[lRn  
 protected: gUq)M  
  HICON m_hIcon; {=Ku9\  
  // Generated message map functions v8L&F9 o  
  //{{AFX_MSG(CCaptureDlg) +v}R-gNR  
  virtual BOOL OnInitDialog(); 2r]!$ hto  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !Ci\Zg  
  afx_msg void OnPaint(); [!v| M  
  afx_msg HCURSOR OnQueryDragIcon(); cLD-,v;c  
  virtual void OnCancel(); i%R2#F7I  
  afx_msg void OnAbout(); :8<\]}J  
  afx_msg void OnBrowse(); QhHexr6  
  afx_msg void OnChange(); ;%R+]&J  
 //}}AFX_MSG `Y`QxU!d%  
 DECLARE_MESSAGE_MAP() pdrF/U+  
}; L'JEkji"  
#endif 7v~\c%1V  
F ;m1I+;  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Jc#()4  
#include "stdafx.h" %Jr6pmc  
#include "Capture.h" 2 #+g4  
#include "CaptureDlg.h" VK)K#!O8  
#include <windowsx.h> 5_mb+A n,  
#pragma comment(lib,"hook.lib") 1Jx|0YmO  
#ifdef _DEBUG Kb#}f/  
#define new DEBUG_NEW 3GSoHsNk  
#undef THIS_FILE 32f lOi:  
static char THIS_FILE[] = __FILE__; Odo"S;)  
#endif -;?5<>zZ  
#define IDM_SHELL WM_USER+1 w]{NaNIeq1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); z <"7vR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5[Ryc[  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ~!,Q<?  
class CAboutDlg : public CDialog c9dH ^t  
{ `aS9 o]t  
 public: g]g2`ab |  
  CAboutDlg(); "5-S:+  
  // Dialog Data hOX$|0i  
  //{{AFX_DATA(CAboutDlg) 1MV\ ^l_  
  enum { IDD = IDD_ABOUTBOX }; [Q/')5b  
  //}}AFX_DATA U?6YY` A8  
  // ClassWizard generated virtual function overrides gJVakR&  
  //{{AFX_VIRTUAL(CAboutDlg) T1y,L<7?  
 protected: jG3}V3|.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support S"iQQV{)Z  
  //}}AFX_VIRTUAL vYD>m~Qc^  
  // Implementation {9<2{$Og  
 protected: l.i"Z pik  
  //{{AFX_MSG(CAboutDlg) )y7SkH|  
  //}}AFX_MSG bT@7&  
  DECLARE_MESSAGE_MAP() V;Zp3Qo!  
}; fNi&1J-/  
Hy<4q^3$G  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ><X!~by  
{ TA}z3!-y*  
 //{{AFX_DATA_INIT(CAboutDlg) Qhnz7/a9  
 //}}AFX_DATA_INIT sBuVm<H  
} g#V3u=I8~  
d0b--v/  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) >NN|vj  
{ F6T@YSP  
 CDialog::DoDataExchange(pDX); bp6 La`+  
 //{{AFX_DATA_MAP(CAboutDlg) $a6&OH/  
 //}}AFX_DATA_MAP vpY|S2w)Bp  
} :\*hAV1i  
N1UE u,j  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)  -> -  
 //{{AFX_MSG_MAP(CAboutDlg) gFvFd:"uZ  
 // No message handlers <G59>H5  
 //}}AFX_MSG_MAP hnM|=[wM  
END_MESSAGE_MAP() O\L(I079  
<ZJ>jZV0*  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) i&^?p|eKa  
: CDialog(CCaptureDlg::IDD, pParent) G:.Nq,513  
{ kNW&rg  
 //{{AFX_DATA_INIT(CCaptureDlg) t%Z_*mIfmE  
  m_bControl = FALSE; ??rx\*,C</  
  m_bAlt = FALSE; >R?EJ;h  
  m_bShift = FALSE; 181-m7W  
  m_Path = _T("c:\\"); /n7F]Ok'*  
  m_Number = _T("0 picture captured."); *?gn@4Ly  
  nCount=0; "w`f>]YLA  
  bRegistered=FALSE; piO+K!C0n:  
  bTray=FALSE; dCcV$BX,K  
 //}}AFX_DATA_INIT  !+IxPn  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 MUNeGqv  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `4Z#/g  
} B4&@PX"'>,  
amGQ!$] %#  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) doXd6q4H  
{ j2#Vdw|j  
 CDialog::DoDataExchange(pDX); @l&5 |Cia  
 //{{AFX_DATA_MAP(CCaptureDlg) 2?ZH WS>U  
  DDX_Control(pDX, IDC_KEY, m_Key); ?4q6>ipx  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); mn" a$  
  DDX_Check(pDX, IDC_ALT, m_bAlt); sEdWBT 8  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); -z0,IYG }  
  DDX_Text(pDX, IDC_PATH, m_Path); f9JD_hhP'  
  DDX_Text(pDX, IDC_NUMBER, m_Number); /k1&?e  
 //}}AFX_DATA_MAP Px=/fO G  
} W1y,.6  
h=4m2m  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) d"5:/Mo  
//{{AFX_MSG_MAP(CCaptureDlg) 4cJ7.Pez  
 ON_WM_SYSCOMMAND() g@nk0lQewj  
 ON_WM_PAINT() F f& VBm  
 ON_WM_QUERYDRAGICON() Ec0Ee0%A]  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) b]RnCu"  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 5jy>)WqK  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ClVMZ  
//}}AFX_MSG_MAP fylW)W4C  
END_MESSAGE_MAP() IwFg1\>  
f|6%71  
BOOL CCaptureDlg::OnInitDialog() ?b8NEVjw  
{ =q5A@!D  
 CDialog::OnInitDialog(); w ^`n  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); sTv/;*  
 ASSERT(IDM_ABOUTBOX < 0xF000); LC[, K  
 CMenu* pSysMenu = GetSystemMenu(FALSE);  }tv-  
 if (pSysMenu != NULL) c!Pi)  
 { FAE>N-brQ  
  CString strAboutMenu; w=#&(xm0  
  strAboutMenu.LoadString(IDS_ABOUTBOX); oi"Bf7{  
  if (!strAboutMenu.IsEmpty()) #wM0p:<  
  { }(M<sEK~  
   pSysMenu->AppendMenu(MF_SEPARATOR); {,s:vPoiA  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); eIof{#  
  } &g) `  
 } =nid #<X  
 SetIcon(m_hIcon, TRUE); // Set big icon zy$hDy0  
 SetIcon(m_hIcon, FALSE); // Set small icon 8%`Sx[  
 m_Key.SetCurSel(0); \=yg@K?"AJ  
 RegisterHotkey(); Ubn5tN MK  
 CMenu* pMenu=GetSystemMenu(FALSE); M"p$9t  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _FdWV?  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); k,?Y`s  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); }E/L:  
 return TRUE; // return TRUE unless you set the focus to a control 'Fc&"(!||  
} qKO\;e*  
y[r T5ed  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) =C#,aoa!  
{ qM1$?U  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ]E=JUYf0  
 { })!n1kt  
  CAboutDlg dlgAbout; 8~2A"<{ub  
  dlgAbout.DoModal(); ^Gd <miw  
 } u:,B"!  
 else 2d3wQ)2  
 { hgVwoZ{`]  
  CDialog::OnSysCommand(nID, lParam); 4El{2cfA  
 } bJBx~  
} (1jkZ^7  
;H\,w /E9  
void CCaptureDlg::OnPaint() ~Kb(`Px@  
{ mZM5aTQ3  
 if (IsIconic()) ]e"NJkcm  
 { k8*=1kl"  
  CPaintDC dc(this); // device context for painting m]DjIs*@%h  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); l0@$]76cX;  
  // Center icon in client rectangle Hss{Sb(  
  int cxIcon = GetSystemMetrics(SM_CXICON); ?_tOqh@in  
  int cyIcon = GetSystemMetrics(SM_CYICON); sPZa|AKHb  
  CRect rect; j:sac*6m  
  GetClientRect(&rect); mU\$piei  
  int x = (rect.Width() - cxIcon + 1) / 2; ,5L &$Q6  
  int y = (rect.Height() - cyIcon + 1) / 2; )?TJ{'m  
  // Draw the icon foJ|Q\Z,T  
  dc.DrawIcon(x, y, m_hIcon); KM\`,1?x92  
 } f%|g7[  
 else GuS3O)6Sg  
 { .OWIlT4K  
  CDialog::OnPaint(); *aT!|;  
 } `\.n_nM  
} { _ 1q`5o  
W&p-Z"=)  
HCURSOR CCaptureDlg::OnQueryDragIcon() j?8E >tM  
{ _@RW7iP>  
 return (HCURSOR) m_hIcon; c dGl[dQ/  
} 74[}AA  
a\MU5%}\  
void CCaptureDlg::OnCancel() 8?)Da&+f  
{ f,uxoAS  
 if(bTray) 9g*~X;`2  
  DeleteIcon(); {9=U6m^R2  
  CDialog::OnCancel(); Tw`l4S&  
} <QJmdcG  
)8N/t6Q  
void CCaptureDlg::OnAbout() 4Fz^[L}[  
{ >5N}ZIN  
 CAboutDlg dlg; +ypT"y  
 dlg.DoModal(); ~&q e"0  
} `kz_ q/K  
N4}h_mh^'  
void CCaptureDlg::OnBrowse() 9GGBJTk-  
{ yT,UM^'  
 CString str; NCsUC  
 BROWSEINFO bi; r%a$u%)oD  
 char name[MAX_PATH]; ;x7SY;0*  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ; 6zu!  
 bi.hwndOwner=GetSafeHwnd(); Df4n9m}E  
 bi.pszDisplayName=name; i&KbzOY  
 bi.lpszTitle="Select folder"; |Y99s)2&N  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; v EX <9  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); VEpQT Qp  
 if(idl==NULL) P&SR;{:y  
  return; Uex b>|  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Y/hay[6  
 str.ReleaseBuffer(); !eO?75/  
 m_Path=str; Fb}9cpz{  
 if(str.GetAt(str.GetLength()-1)!='\\') '1{~y3  
  m_Path+="\\"; p75w^  
 UpdateData(FALSE); UnMDdJ\  
} LTCjw_<7  
@z,'IW74V  
void CCaptureDlg::SaveBmp() 8~I>t9Q+  
{ h?O-13v   
 CDC dc; yZ  P+  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); |_rj 12.xo  
 CBitmap bm; tJn2:}-s  
 int Width=GetSystemMetrics(SM_CXSCREEN); +u Lu.-N  
 int Height=GetSystemMetrics(SM_CYSCREEN); z/T ZOFaM  
 bm.CreateCompatibleBitmap(&dc,Width,Height); iVl"H@m/  
 CDC tdc; K~E]Fkw!;  
 tdc.CreateCompatibleDC(&dc); Ue\&  
 CBitmap*pOld=tdc.SelectObject(&bm); 2V0R|YUt  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); V]8fn MH  
 tdc.SelectObject(pOld); /bb4nM_E/  
 BITMAP btm; {.2C>p  
 bm.GetBitmap(&btm); yQW\0&a$  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; `=>Bop)  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); S%4hv*_c  
 BITMAPINFOHEADER bih; n/6A@C  
 bih.biBitCount=btm.bmBitsPixel; `BvcI n4do  
 bih.biClrImportant=0; |~/{lE=I  
 bih.biClrUsed=0; 6` s[PKP.  
 bih.biCompression=0; r*$"]{m}  
 bih.biHeight=btm.bmHeight; +`4|,K7'  
 bih.biPlanes=1; 1ERz:\  
 bih.biSize=sizeof(BITMAPINFOHEADER); +g;G*EP7*  
 bih.biSizeImage=size; =1,g#HS  
 bih.biWidth=btm.bmWidth; ~9n@MPS^!  
 bih.biXPelsPerMeter=0; GphG/C (  
 bih.biYPelsPerMeter=0; vrbS-Z<S9  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); wx1uduT)  
 static int filecount=0; emaNmpg  
 CString name; sM4wh_lO  
 name.Format("pict%04d.bmp",filecount++); 9}\T?6?8pX  
 name=m_Path+name; 6lhVwgy3A  
 BITMAPFILEHEADER bfh; l5MxJ>?4%B  
 bfh.bfReserved1=bfh.bfReserved2=0; PFc02 w  
 bfh.bfType=((WORD)('M'<< 8)|'B'); q@\D5F% >  
 bfh.bfSize=54+size; jv7zvp  
 bfh.bfOffBits=54; Md~mI8  
 CFile bf; UxW>hbzr&V  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ r`krv-,O$  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); {P]l{W@li  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); I;`V*/s8"  
  bf.WriteHuge(lpData,size); #"Zr#P{P  
  bf.Close(); l^vq'<kI  
  nCount++; wVPq1? 9  
 } LY|h*a6Ym  
 GlobalFreePtr(lpData); J^W.TM&q$,  
 if(nCount==1) 1idEm*3&(  
  m_Number.Format("%d picture captured.",nCount); :{fsfZXXr  
 else !1l2KW<be  
  m_Number.Format("%d pictures captured.",nCount); AiyjrEa%  
  UpdateData(FALSE); <wuP*vI "h  
} J+;.t&5R  
F3qi$3HM  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) k`&mHSk-  
{ (;n|>l?*  
 if(pMsg -> message == WM_KEYDOWN) @M,_mX  
 { 87HVD Di  
  if(pMsg -> wParam == VK_ESCAPE) 15zL,yo  
   return TRUE; mrJQB I+  
  if(pMsg -> wParam == VK_RETURN) 5P! ZJ3C  
   return TRUE; m}XI?[!s  
 } XJlun l)(K  
 return CDialog::PreTranslateMessage(pMsg); Jd%#eD*k9  
} kgQEg)A]!x  
?T^$,1 -  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1"'//0 7  
{ $v^F>*I1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ D( _a Xy  
  SaveBmp(); "qF&%&#r'  
  return FALSE; ^fx9R 5E$:  
} E`X+fJx  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ EfyF]cYL  
 CMenu pop; dRu@5 :BP  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); NLdUe32A  
 CMenu*pMenu=pop.GetSubMenu(0); >S~#E,Tg  
 pMenu->SetDefaultItem(ID_EXITICON); "#9WF}  
 CPoint pt; WOwIJrP  
 GetCursorPos(&pt); lfGiw^  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 3!d|K%J  
 if(id==ID_EXITICON) uM\~*@   
  DeleteIcon(); x=H*"L=  
 else if(id==ID_EXIT) c)lK{DC  
  OnCancel(); p#?1l/f"  
 return FALSE; Zj}, VB*T  
} X{ Nif G  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); sz)3 z  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) F;z FKvn  
 AddIcon(); D~1nh%x_  
 return res; ;Y~;G7  
} v/^2K,[0>  
8kqxr&,[  
void CCaptureDlg::AddIcon() *</;:?  
{ b\^.5SEw  
 NOTIFYICONDATA data; /fD)/x  
 data.cbSize=sizeof(NOTIFYICONDATA); r)b`3=  
 CString tip; ny MA%9,B  
 tip.LoadString(IDS_ICONTIP); >#kzPYsp  
 data.hIcon=GetIcon(0); eAl&[_o|S  
 data.hWnd=GetSafeHwnd(); #fFEo)YG  
 strcpy(data.szTip,tip); LAr6J  
 data.uCallbackMessage=IDM_SHELL; YY.;J3C  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;  \n`]QN  
 data.uID=98; ")LF;e  
 Shell_NotifyIcon(NIM_ADD,&data); W0?yPP=.  
 ShowWindow(SW_HIDE); J%}}( G~  
 bTray=TRUE; {o]OxqE@  
} bFTWuM  
N7jAPI@a\i  
void CCaptureDlg::DeleteIcon() <:ZN  
{ GWhb@K  
 NOTIFYICONDATA data; Fc nR}TE  
 data.cbSize=sizeof(NOTIFYICONDATA); JL*-L*|Zcl  
 data.hWnd=GetSafeHwnd(); }q~A( u  
 data.uID=98; Z|j8:Ohz  
 Shell_NotifyIcon(NIM_DELETE,&data); \V&ly/\ )  
 ShowWindow(SW_SHOW); L$jRg  
 SetForegroundWindow(); +ivz  
 ShowWindow(SW_SHOWNORMAL); ir\   
 bTray=FALSE; %;zA_Wg  
} PL VF  
<( MBs$b  
void CCaptureDlg::OnChange() T? =jKLPC  
{ \"f}Fx  
 RegisterHotkey(); Bd7A-T)q!  
} ;z[yNW8  
1 ltoLd\{  
BOOL CCaptureDlg::RegisterHotkey() =XYfzR  
{ eDy}_By^  
 UpdateData(); =|jOio=s:  
 UCHAR mask=0; fs`<x*}K  
 UCHAR key=0; xXyzzr1[  
 if(m_bControl) jm*v0kNy  
  mask|=4; k1%Ek#5  
 if(m_bAlt) (57x5qP X  
  mask|=2; `HHbQXB  
 if(m_bShift) fygy#&}~  
  mask|=1; - BocWq\  
  key=Key_Table[m_Key.GetCurSel()]; %i^%D  
 if(bRegistered){ htkyywv  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 7u!p.kN  
  bRegistered=FALSE; |_ ;-~bmb  
 } L=VuEF  
 cMask=mask; Et7AAV*8g  
 cKey=key; r_ o2d8  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 5:AAqMa  
 return bRegistered; aoCyYnZD  
} t=U[ ;?  
AU >d1S.  
  四、小结 gsAcn  
U"ga0X5  
  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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