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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: v4rW2F:X  
  0K `[,$Y  
  一、实现方法 +5!&E7bcd  
`zA#z />  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: +bA%  
0 Y>M=|  
#pragma data_seg("shareddata") =dZHYO^Cv  
HHOOK hHook =NULL; //钩子句柄 ^{F_ a  
UINT nHookCount =0; //挂接的程序数目 aUc|V{Jp  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 g^7MMlY%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 E{?au]y$J  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey SJ?cI!=x  
static int KeyCount =0; tyh@ ^7  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 jQS 6J+F]  
#pragma data_seg() dOFD5}_   
o`n$b(VZ  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 j8Cho5C  
e}hmS1>H  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ~q+hV+fa>  
b[I8iSkfi  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR A1 "SLFY  
cKey,UCHAR cMask) OsqN B'X  
{ |'d>JT:  
 BOOL bAdded=FALSE; -' g*^  
 for(int index=0;index<MAX_KEY;index++){ q o\?o    
  if(hCallWnd[index]==0){ l-ct?T_@  
   hCallWnd[index]=hWnd; du)~kU>l  
   HotKey[index]=cKey; Iz ;G*W18  
   HotKeyMask[index]=cMask; sFQ^2PwbS  
   bAdded=TRUE; c zm& ~n6$  
   KeyCount++; s VJ!FC  
   break; S(uf(q|{  
  } G(~;]xNW+  
 } :'*DPB-  
 return bAdded; 3:8{"md@2  
} {%IExPJ  
//删除热键 I_xX Dr  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /Wy.>YC|  
{ Sp}tD<V  
 BOOL bRemoved=FALSE; RTv qls  
 for(int index=0;index<MAX_KEY;index++){ Fd#m<"  
  if(hCallWnd[index]==hWnd){ Clh!gpB c  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ YhY:~  
    hCallWnd[index]=NULL; O9g{+e`  
    HotKey[index]=0; ~M\I;8ne  
    HotKeyMask[index]=0; 7}vg.hmZ  
    bRemoved=TRUE; Rr!Y3)f;  
    KeyCount--; z,VD=Hnz  
    break; %/YcL6o(  
   } |]aE<`D  
  } HO[wTB|D]  
 } H)>@/"j;  
 return bRemoved; S6fL>'uQ  
} fgBM_c&9T  
59#lU~Kv  
y| Ir._bt  
  DLL中的钩子函数如下: >5j<4ShW  
;>AL`M+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /__PSK  
{ |U_]vMq  
 BOOL bProcessed=FALSE; Ton94:9bZ  
 if(HC_ACTION==nCode) l983vKr  
 { fPrLM'  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 @fa@s-wb  
   switch(wParam) OQ,NOiNkap  
   {  iC*F  
    case VK_MENU: yB3;  
     MaskBits&=~ALTBIT; ^mb[j`CCt  
     break; TARXx>  
    case VK_CONTROL: Q7g>4GZC  
     MaskBits&=~CTRLBIT; Y2O"]phi@  
     break; v?c 0[+?  
    case VK_SHIFT: 2qi'g:qe  
     MaskBits&=~SHIFTBIT; " v}pdUW  
     break; f/kI| Z  
    default: //judge the key and send message -AYA~O(&  
     break; f1PN |  
   } 3M0+"l(X  
   for(int index=0;index<MAX_KEY;index++){ ?%O3Oi Xz  
    if(hCallWnd[index]==NULL) `mH %!{P  
     continue; ICB~_O5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )s9',4$eK<  
    { I5AO?BzJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $hR)i  
     bProcessed=TRUE; ^+SkCO  
    } idRD![!UI  
   } Sb".]>^  
  } jxgj,h"}9`  
  else if((lParam&0xc000ffff)==1){ //有键按下 zNSu  
   switch(wParam) I =Wc&1g  
   { g`k?AM\  
    case VK_MENU: t!1$$e?`r  
     MaskBits|=ALTBIT; /?/#B `  
     break; L?Yoh<  
    case VK_CONTROL: S<nq8Ebmw  
     MaskBits|=CTRLBIT; % p?b rc  
     break; d {2  
    case VK_SHIFT: #(LfYw.P1V  
     MaskBits|=SHIFTBIT; 5~XN>>hp  
     break; Fk=}iB#(  
    default: //judge the key and send message .r+hERcB  
     break; iP3Z  
   } d h^^G^  
   for(int index=0;index<MAX_KEY;index++){ 3}1ssU"T  
    if(hCallWnd[index]==NULL) ]J2:194  
     continue; ,%#   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t j Vh^  
    { T:asm1BC[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); T_<BVM  
     bProcessed=TRUE; aaWJ* >rJ  
    } /DS?}I.*]  
   } ~<qt%W?  
  } k /EDc533d  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 0m9ZQ O  
   for(int index=0;index<MAX_KEY;index++){ >x:EJV   
    if(hCallWnd[index]==NULL) ts9pM~_~  
     continue; PHM:W%g:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @nV5.r0W}B  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -dTLunv  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 }UyQ#U  
   } HO|-@yOF^  
  } MN;/*t  
 } \ SCy$,m  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 1ywU@].6J]  
} iy5R5L 2  
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  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: ^gro=Bp(  
iT )WR90  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _94s(~g:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &b C}3D  
9|:^k.  
  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: 2O""4_G  
%I4zQiJ%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) d}0qJoH4  
{ cHvF*A  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) E%k7wM {  
 { o#i ]"  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 CUmH,`hu  
  SaveBmp(); 0~E 6QhV:  
  return FALSE; @] .VQ<X|0  
 } m^Lj+=Z"  
 …… //其它处理及默认处理 }#N]0I)JI  
} $@[)nvV\  
w^VSj%XH!  
}N3`gCy9eN  
  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。 jqoPLbxT  
xl!K;Y2<  
  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。 eO4)|tW  
/(6zsq'v|  
  二、编程步骤 @5Qoi~o  
CI^|k/  
  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"; *%- ?54B  
N=ifIVc  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Kmry=`=A  
?eWJa  
  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; gL]'B!dGd  
hLA;Bl  
  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; _nX%#/{  
Y1r ,2k  
  5、 添加代码,编译运行程序。 i:Mc(mW  
p?Sl}A@`  
三、程序代码 $N\+,?  
3q~Fl=|.o  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL [@.B4p  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) zzf7S%1I  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ #S?c ;3-  
#if _MSC_VER > 1000 xii$e  
#pragma once ec'tFL#u{  
#endif // _MSC_VER > 1000 9v?V  
#ifndef __AFXWIN_H__ 9t }xXk  
#error include 'stdafx.h' before including this file for PCH pN k8! k  
#endif 5'9.np F)  
#include "resource.h" // main symbols TzY!D *%z  
class CHookApp : public CWinApp n0FYfqH  
{ qBiyGlu4  
 public: @zs1>\J7  
  CHookApp(); cs5ix"1A  
  // Overrides \\iK'|5YG  
  // ClassWizard generated virtual function overrides (w2(qT&O  
  //{{AFX_VIRTUAL(CHookApp) sX~45u \  
 public: W"O-L  
  virtual BOOL InitInstance(); K{FhT9R'  
  virtual int ExitInstance(); C 38XQLC  
  //}}AFX_VIRTUAL S-P{/;c@  
  //{{AFX_MSG(CHookApp) =+(Q.LmhC  
  // NOTE - the ClassWizard will add and remove member functions here. vTcZ8|3e  
  // DO NOT EDIT what you see in these blocks of generated code ! {e6 KJ@H6  
  //}}AFX_MSG {9{J^@@  
  DECLARE_MESSAGE_MAP() 7<4xtK`+b  
}; u2,H ]-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ] j1 vbk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); o_3*;}k8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7uA\&/ ,  
BOOL InitHotkey(); N4+g("  
BOOL UnInit(); f~v"zT  
#endif >gGil|I  
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//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ,N;v~D$Y  
#include "stdafx.h" +<B|qcT!  
#include "hook.h" G)4SWu0<t  
#include <windowsx.h> }_vM&.GFlL  
#ifdef _DEBUG r?]%d!   
#define new DEBUG_NEW 2i"HqAB  
#undef THIS_FILE U~hCn+0  
static char THIS_FILE[] = __FILE__; A{t"M-<  
#endif -UTV:^  
#define MAX_KEY 100 8LeK wb  
#define CTRLBIT 0x04 ktWZBQY  
#define ALTBIT 0x02 m/KjJ"s,  
#define SHIFTBIT 0x01 ,.q8Xf  
#pragma data_seg("shareddata") ,lUr[xzV  
HHOOK hHook =NULL; yD\[`!sWk  
UINT nHookCount =0; 2 ,bLEhu  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey XI8rU)q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT uL1$yf'  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey GL- r;  
static int KeyCount =0; p^/6Rb"e  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift C;BC@OE  
#pragma data_seg() KBSO^<7  
HINSTANCE hins; B33H,e)  
void VerifyWindow(); +\@}IKWl-?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) o n+:{ad  
//{{AFX_MSG_MAP(CHookApp) JS{trqc1d  
// NOTE - the ClassWizard will add and remove mapping macros here. 6 OLp x)fG  
// DO NOT EDIT what you see in these blocks of generated code! ^9wQl!e ob  
//}}AFX_MSG_MAP #G`UR  
END_MESSAGE_MAP() :^H#i:4  
O77bm,E  
CHookApp::CHookApp() `:y {  
{ W2 p&LP  
 // TODO: add construction code here, +PfXc?VU  
 // Place all significant initialization in InitInstance 0'Y'K6hG`  
} z3+7gp+I;  
)*tV  
CHookApp theApp; SuuLB6{u3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) hJsYKd8g  
{ "S ~(|G  
 BOOL bProcessed=FALSE; ^_C]?D?  
 if(HC_ACTION==nCode) Jg:%|g  
 { ^w1&A 3=6  
  if((lParam&0xc0000000)==0xc0000000){// Key up Aq~}<qkIF+  
   switch(wParam) (s?Rbd  
   { =k +nC)e  
    case VK_MENU: |2'u@<(Z/  
     MaskBits&=~ALTBIT; _t'S<jTI  
     break; Rx,Qw> #  
    case VK_CONTROL: Xe:gH.}  
     MaskBits&=~CTRLBIT; $22_>OsA  
     break; pY T^Ug  
    case VK_SHIFT: r iuG,$EX  
     MaskBits&=~SHIFTBIT; :1/K$A)^{  
     break; 2qQG  
    default: //judge the key and send message oMNgyAp^  
     break; ,KO_h{mI<  
   } VP\'p1a  
   for(int index=0;index<MAX_KEY;index++){ m.|__L  
    if(hCallWnd[index]==NULL) C % d  
     continue; %; 0l1X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) CR KuN  
    { #;*0 Pwe`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); uOU?-WtPz  
     bProcessed=TRUE; 93+p~?  
    } =:~%$5[[  
   } 72;4  
  } pD )$O}  
  else if((lParam&0xc000ffff)==1){ //Key down aOWfu^&H:  
   switch(wParam) b{WEux{)  
   { oI/jGyY;  
    case VK_MENU: ?oKY"C8/  
     MaskBits|=ALTBIT; H[S 4o,  
     break; cI g|sn  
    case VK_CONTROL: 'c")]{  
     MaskBits|=CTRLBIT; GLIe8T*ht  
     break; qDzd_E@aR  
    case VK_SHIFT: UCv9G/$  
     MaskBits|=SHIFTBIT; EoOB0zo}Y+  
     break; k%[pZ 5.!  
    default: //judge the key and send message icnc5G  
     break; vxmz3ht,Q  
   } x<-n}VK\  
   for(int index=0;index<MAX_KEY;index++) l'#P:eW  
   { F_ Cp,  
    if(hCallWnd[index]==NULL) hj8S#  
     continue; $2?10}mrx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HU='Hk!  
    { =@UgCu>=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); pO~lVM  
     bProcessed=TRUE; Sjogv  
    } 6)QJms  
   } S@N:Cj  
  } )w.\xA~|  
  if(!bProcessed){ ?'I[[KuG  
   for(int index=0;index<MAX_KEY;index++){ Lh"!Z  
    if(hCallWnd[index]==NULL) IQz:D J  
     continue; .%iJin"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) svBT~P0x  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); tk"+PTGJT  
   } 0."TSe83\  
  } "gR W91 T  
 } bkZ~O=uv$-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Ckelr  
} H,F/u&O  
mM&*_#( 6  
BOOL InitHotkey() @y#QHJ.j  
{ 7Z(F-B +j  
 if(hHook!=NULL){ :4ndU:.L  
  nHookCount++; z@xkE ,j>  
  return TRUE; [Y6ZcO/-i  
 } IZZ $p{  
 else t;lK=m|  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); A)kdY!}  
  if(hHook!=NULL) l D]?9K29  
   nHookCount++; qkq^oHI  
  return (hHook!=NULL); sQT<I]e  
} 8|rlP  
BOOL UnInit() 0Y*Ag ,S  
{ "D ivsq^  
 if(nHookCount>1){ 49 1 1  
  nHookCount--; 8{p#Nl?U1  
  return TRUE; E1|:t$>Ld  
 } Gk<6+.c~  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Qr[".>+  
 if(unhooked==TRUE){ v79\(BX  
  nHookCount=0; ^L's45&_  
  hHook=NULL; .IORvP-M&  
 } D(M^%z2N  
 return unhooked; 8' +I8J0l  
} WD#7Q&T(;  
NQ\<~a`Eq  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :"Kr-Hm`  
{ i7xBi:Si  
 BOOL bAdded=FALSE; ]U3@V#*  
 for(int index=0;index<MAX_KEY;index++){ FJ O- p  
  if(hCallWnd[index]==0){ );V.le}%(  
   hCallWnd[index]=hWnd; rh6m  
   HotKey[index]=cKey; c]/&xRd  
   HotKeyMask[index]=cMask; 6"jV>CNc@  
   bAdded=TRUE; stlkt>9  
   KeyCount++; 6>/g`%`N  
   break; . AX6xc6  
  } 9AZpvQ  
 } qbQH1<yS<  
 return bAdded; @Yh%.#\i%  
} Bl v @u?  
DsGtc<l%  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) CWM_J9f  
{ 66Xo3 o  
 BOOL bRemoved=FALSE; |ea}+N  
 for(int index=0;index<MAX_KEY;index++){ :<`po4/  
  if(hCallWnd[index]==hWnd){ $oH?7sj  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ B}Sl1)E  
    hCallWnd[index]=NULL; F]^ZdJ2  
    HotKey[index]=0; NEX{vZkgw  
    HotKeyMask[index]=0; hdx"/.s  
    bRemoved=TRUE; W= $, \D+  
    KeyCount--; dO\irv)  
    break; M\dZxhQ-l  
   } y4N=v{EbL  
  } zX ?@[OT  
 } /FA0(< -}  
 return bRemoved; p*" H&xA@  
} H6]z98  
nn6&`$(Q~  
void VerifyWindow() I]Jz[{~1  
{ 44(l1xEN+  
 for(int i=0;i<MAX_KEY;i++){ ':_1z5  
  if(hCallWnd!=NULL){ fkK42*U@r  
   if(!IsWindow(hCallWnd)){ X\'+);Z  
    hCallWnd=NULL; \v[?4 [  
    HotKey=0; A>W8^|l6+-  
    HotKeyMask=0; sc &S0K  
    KeyCount--; ^K n{L  
   } h[I~D`q)v  
  } ;]xJC j  
 } zQ~8(E]Rf  
} qx<h rC0Z&  
%,[p[`NRYR  
BOOL CHookApp::InitInstance() !_My]>S  
{ N|Cs=-+  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); tY/vL^mi  
 hins=AfxGetInstanceHandle(); L ^J- ("e_  
 InitHotkey(); /bVZ::A&_  
 return CWinApp::InitInstance(); ql{_%x?  
} ;`j/D@H  
Tx>K:`oB  
int CHookApp::ExitInstance() {E_{JB~`  
{ On_@HQ/FI  
 VerifyWindow(); })F*:9i*  
 UnInit(); @w9{5D4  
 return CWinApp::ExitInstance(); 4ne5=YY *  
} CXaWgxlK:a  
_^S]gmE  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file gwB\<rzG  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Zj9c9  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Fd$!wBL  
#if _MSC_VER > 1000 PGn);Baq  
#pragma once ]!"S+gT*C  
#endif // _MSC_VER > 1000 ]`o!1(GA  
S;\R!%t_  
class CCaptureDlg : public CDialog ^krk&rW3  
{ 'S4)?Z  
 // Construction J5p8nmb  
 public: /pH(WHT+/H  
  BOOL bTray; Ub$n |xn  
  BOOL bRegistered; N3A<:%s  
  BOOL RegisterHotkey(); z!wDpG7b  
  UCHAR cKey; /YKMKtE  
  UCHAR cMask; Ve 3 ;  
  void DeleteIcon(); ) ]6h y9<  
  void AddIcon(); !7p}C-RZp  
  UINT nCount; epD?K  
  void SaveBmp(); ;/O#4]2*  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 2a=sm1?  
  // Dialog Data o+O}Te  
  //{{AFX_DATA(CCaptureDlg) Yc Q=vt{  
  enum { IDD = IDD_CAPTURE_DIALOG }; s}5+3f$f  
  CComboBox m_Key; U]6&b  
  BOOL m_bControl; \}*k)$r  
  BOOL m_bAlt; (nSml,gU  
  BOOL m_bShift; } (FPV*mS  
  CString m_Path; Z9`TwS@x[  
  CString m_Number; i\?*=\a  
  //}}AFX_DATA k%'m*Tf  
  // ClassWizard generated virtual function overrides ,I.WX,OR  
  //{{AFX_VIRTUAL(CCaptureDlg) b0<o  
 public: U7$WiPTNL9  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ;iYff N  
 protected: A&5:ATQ/|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `u'bRp  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =Ufr^naA  
  //}}AFX_VIRTUAL C|-pD  
  // Implementation `8_z!)  
 protected: B}?IEpYp  
  HICON m_hIcon; L{{CAB!  
  // Generated message map functions <uAqb Wu  
  //{{AFX_MSG(CCaptureDlg) B (BWdrG  
  virtual BOOL OnInitDialog(); xX&*&RPZ  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); aB$Y5  
  afx_msg void OnPaint(); ";GLX%C!{@  
  afx_msg HCURSOR OnQueryDragIcon(); HO wJ 2L  
  virtual void OnCancel(); c,+oH<bZZs  
  afx_msg void OnAbout(); JY /Cd6\  
  afx_msg void OnBrowse(); EswM#D 9(4  
  afx_msg void OnChange(); \Q#F&q0  
 //}}AFX_MSG $u`;{8  
 DECLARE_MESSAGE_MAP() kQj8;LU  
}; {yJ{DU?%Y  
#endif fc M~4yP?  
q-uYfXZ{j  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `a<G7  
#include "stdafx.h" bL swq  
#include "Capture.h" @>X."QbE  
#include "CaptureDlg.h" dYf Vox;  
#include <windowsx.h> \-V  
#pragma comment(lib,"hook.lib") +]5JXt^  
#ifdef _DEBUG w y:USS?  
#define new DEBUG_NEW r4!zA-{  
#undef THIS_FILE 9FcCq*D  
static char THIS_FILE[] = __FILE__; 0fi+tc 30  
#endif &S''fxGL  
#define IDM_SHELL WM_USER+1 NBUM* Z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); k9yA#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >qcir~ &  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ]C5JP~ #z  
class CAboutDlg : public CDialog ec"L*l"  
{ A6TNtXk  
 public: ) ae/+Q8  
  CAboutDlg(); l}:9)nXA{  
  // Dialog Data b*?="%eE(  
  //{{AFX_DATA(CAboutDlg) 6 `X#<#_&  
  enum { IDD = IDD_ABOUTBOX }; G^)|c<'M  
  //}}AFX_DATA 7CrWsQl u  
  // ClassWizard generated virtual function overrides )WKe,:C  
  //{{AFX_VIRTUAL(CAboutDlg) H^'*F->BA  
 protected: *k=Pk  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support '3%!Gi!g  
  //}}AFX_VIRTUAL jr~76  
  // Implementation ]J_Dn\  
 protected: Bv3?WW  
  //{{AFX_MSG(CAboutDlg) >Mi A|N=  
  //}}AFX_MSG $n(@hT>?  
  DECLARE_MESSAGE_MAP() 3ywBq9FGhp  
}; (W*yF2r  
 BX+-KvT  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) >q[Elz=dI  
{ |D`Zi>lv  
 //{{AFX_DATA_INIT(CAboutDlg) nCXIWLw  
 //}}AFX_DATA_INIT >UR-37g{p  
} 5vg@zH\z  
-$[=AqJXp;  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) :^J(%zy  
{ s)xfTr_$  
 CDialog::DoDataExchange(pDX); BD,~M*%z  
 //{{AFX_DATA_MAP(CAboutDlg) WpSdukXY{  
 //}}AFX_DATA_MAP GD~3RnGQ{  
} tEBf2|<  
!=k\Rr@qx  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) _%Mu{Ni&  
 //{{AFX_MSG_MAP(CAboutDlg) f85j?Jm  
 // No message handlers \=,+weGw@  
 //}}AFX_MSG_MAP CF =#?+x  
END_MESSAGE_MAP() bpKMQrwd  
>N+e c_D^  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 6q6&N'We  
: CDialog(CCaptureDlg::IDD, pParent) t(Iy[-  
{ :vX;>SH$p  
 //{{AFX_DATA_INIT(CCaptureDlg) +(UrqK4Av  
  m_bControl = FALSE; URJ"  
  m_bAlt = FALSE; =NyzX&H6  
  m_bShift = FALSE; b\]"r x (  
  m_Path = _T("c:\\"); cnCUvD]'  
  m_Number = _T("0 picture captured."); j!:U*}f  
  nCount=0; %#ms`"H  
  bRegistered=FALSE; n1buE1r?  
  bTray=FALSE; ?CL1^N%  
 //}}AFX_DATA_INIT x1mxM#ql  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 {TE0  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Odw SNG  
} JL;H:`x  
ukq9Cjs  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) uyjZmT/-  
{ gEU)UIJ  
 CDialog::DoDataExchange(pDX); ]WyV~Dzz<  
 //{{AFX_DATA_MAP(CCaptureDlg) !Me%W3  
  DDX_Control(pDX, IDC_KEY, m_Key); wrGd40  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); rw_&t>Ri;  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ^Fb"Is#S,  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ><`.(Z5c  
  DDX_Text(pDX, IDC_PATH, m_Path); Ob0=ZW`+&  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Y k~ i.p  
 //}}AFX_DATA_MAP alHwN^GhP  
} jnH44  
B;W=61d  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) $. V(_  
//{{AFX_MSG_MAP(CCaptureDlg) Mt@K01MI%  
 ON_WM_SYSCOMMAND() !v`q%JW(  
 ON_WM_PAINT() NF&\<2kX  
 ON_WM_QUERYDRAGICON() Dtd bQF  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Ds L]o  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) [HQ17  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ;J?^M!l2=  
//}}AFX_MSG_MAP L[TL~@T   
END_MESSAGE_MAP() \4zvknk<  
=bv8W < #  
BOOL CCaptureDlg::OnInitDialog() U@Aq@d+n  
{ s8eiq`6\H}  
 CDialog::OnInitDialog(); du'$JtZo  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); :MJBbrV ,  
 ASSERT(IDM_ABOUTBOX < 0xF000); #Kn7 xn[  
 CMenu* pSysMenu = GetSystemMenu(FALSE); <!DOCvd  
 if (pSysMenu != NULL)  ] mP-HFl  
 { 9h*$P:S;1v  
  CString strAboutMenu; @&E E/j^  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &Lq @af#  
  if (!strAboutMenu.IsEmpty()) X8;03EW;  
  { | G%MiYd  
   pSysMenu->AppendMenu(MF_SEPARATOR); fCEd :Kr  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); *'exvY~  
  } L/<Up   
 } ;'J L$=  
 SetIcon(m_hIcon, TRUE); // Set big icon 8oA6'%.e  
 SetIcon(m_hIcon, FALSE); // Set small icon wQ [2yq  
 m_Key.SetCurSel(0); LGod"8~U  
 RegisterHotkey(); \N"K^kR4  
 CMenu* pMenu=GetSystemMenu(FALSE); vO4 &ZQ>6  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); DO( /,A<{8  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }Hb_8P  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); XtNe) Ry  
 return TRUE; // return TRUE unless you set the focus to a control fR~_5 pt7  
} uwyzxj  
S M@l4GH  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) m%+W{N4Wb  
{ >+7+ gSD#:  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) p=coOWOQ  
 { !Jh-v  
  CAboutDlg dlgAbout; &0It"17Ej  
  dlgAbout.DoModal(); 9 @!Og(l  
 } DFwkd/3"  
 else I$n 0aR6  
 { 0X~   
  CDialog::OnSysCommand(nID, lParam); [j?n}D@L  
 } G=s}12/Z"{  
} e-})6)XgA  
wQ:)KjhHH  
void CCaptureDlg::OnPaint() /wGM#sFH  
{ @(EAq<5{  
 if (IsIconic()) XAD- 'i  
 { W]$w@.oW[  
  CPaintDC dc(this); // device context for painting CCs%%U/=  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); :I.mGH!^  
  // Center icon in client rectangle p%up)]?0  
  int cxIcon = GetSystemMetrics(SM_CXICON); g/4[N{Xf  
  int cyIcon = GetSystemMetrics(SM_CYICON); V(}:=eK  
  CRect rect; zxEL+P  
  GetClientRect(&rect); y4yhF8E>;U  
  int x = (rect.Width() - cxIcon + 1) / 2; A]*}HZ ,  
  int y = (rect.Height() - cyIcon + 1) / 2; @?ebuj5{e  
  // Draw the icon _r#Z}HK  
  dc.DrawIcon(x, y, m_hIcon); _=>He=v/  
 } qfF~D0}  
 else |*Yr<zt  
 { m<G,[Yc  
  CDialog::OnPaint(); t mn tp  
 } W<{h,j8  
} !"AvY y9  
q~Hn -5H4Q  
HCURSOR CCaptureDlg::OnQueryDragIcon() MBK^FR-K  
{ 1}+3dB_s  
 return (HCURSOR) m_hIcon; S)(.,x  
} -12UN(&&Z  
TvoyZW\?w  
void CCaptureDlg::OnCancel() `%bypHeSp  
{ OG~gFZr)6  
 if(bTray) ZmqKQO  
  DeleteIcon(); gk4;>}  
  CDialog::OnCancel(); <\ y@*fg+  
} O^PKn_OJ  
t^-d/yKt0w  
void CCaptureDlg::OnAbout() Eh`7X=Z7E  
{ 9)yJ: N#F  
 CAboutDlg dlg; lgAoJ[  
 dlg.DoModal(); h8j.(  
} yF:1( 4  
;a!S!% .h  
void CCaptureDlg::OnBrowse() phkwN}6  
{ g'f@H-KCD  
 CString str; 1nM  #kJ"  
 BROWSEINFO bi; R-wp9^  
 char name[MAX_PATH]; ]#<4vl\  
 ZeroMemory(&bi,sizeof(BROWSEINFO));  7Die FZ?  
 bi.hwndOwner=GetSafeHwnd(); "!P3R1;%  
 bi.pszDisplayName=name; ]! &FKy  
 bi.lpszTitle="Select folder"; YaqR[F  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; m@j?za9s  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); F;EwQjTF  
 if(idl==NULL) 9=M$AB  
  return; Q}JOU  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); |i*37r6]=  
 str.ReleaseBuffer(); /N+dQe  
 m_Path=str; Ny7S  
 if(str.GetAt(str.GetLength()-1)!='\\') ,t744k')  
  m_Path+="\\"; #zy :a%  
 UpdateData(FALSE); Paq4  
} nAato\mM  
`hm-.@f,9  
void CCaptureDlg::SaveBmp() C& f= ywi0  
{ Wi<m{.%\E  
 CDC dc; 0auYG><=  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); =*.~BG  
 CBitmap bm; P;no?  
 int Width=GetSystemMetrics(SM_CXSCREEN); t3ZOco@~P  
 int Height=GetSystemMetrics(SM_CYSCREEN); e"cXun4nS=  
 bm.CreateCompatibleBitmap(&dc,Width,Height); klYX7?  
 CDC tdc; cZ*@$%_  
 tdc.CreateCompatibleDC(&dc); Vt~{Gu-Y  
 CBitmap*pOld=tdc.SelectObject(&bm); z6P$pqyF  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); \l0[rcEf  
 tdc.SelectObject(pOld); =I5>$}q_&,  
 BITMAP btm; aO[w/cGQ  
 bm.GetBitmap(&btm); v/plpNVp >  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; H41?/U,{  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); *>}@7}f  
 BITMAPINFOHEADER bih; I 34>X`[o  
 bih.biBitCount=btm.bmBitsPixel; 6|=f$a  
 bih.biClrImportant=0; e%M;?0j  
 bih.biClrUsed=0;  K5 z<3+  
 bih.biCompression=0; ue"~9JK.  
 bih.biHeight=btm.bmHeight; d-ko ^Y0  
 bih.biPlanes=1; e`s ~.ZF  
 bih.biSize=sizeof(BITMAPINFOHEADER); $I>w]  
 bih.biSizeImage=size; 29b9`NXt  
 bih.biWidth=btm.bmWidth; |r/"  |`  
 bih.biXPelsPerMeter=0; wlvgg  
 bih.biYPelsPerMeter=0; P+sW[:  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); kD%( _K5  
 static int filecount=0; 0+ '&`Q!u  
 CString name; uW{l(}0N  
 name.Format("pict%04d.bmp",filecount++); u=sp`%?  
 name=m_Path+name; ^ytrK Q  
 BITMAPFILEHEADER bfh; uzPV To|=  
 bfh.bfReserved1=bfh.bfReserved2=0; 5qm`J,~k  
 bfh.bfType=((WORD)('M'<< 8)|'B'); =WATyY:s  
 bfh.bfSize=54+size; q;CiV  
 bfh.bfOffBits=54; &z3o7rif$  
 CFile bf; {P./==^0  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ p l0\2e)  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +'a^f5  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); AT3Mlz~7#  
  bf.WriteHuge(lpData,size); ^x,YW]AS}  
  bf.Close(); %> eiAB_b  
  nCount++; 4$<JHo @.  
 } t*u:hex  
 GlobalFreePtr(lpData); SnfYT)Ph  
 if(nCount==1) \8cx6 G'  
  m_Number.Format("%d picture captured.",nCount); ?`ZU R& 20  
 else CTa57R  
  m_Number.Format("%d pictures captured.",nCount); RrB&\9=  
  UpdateData(FALSE); n>YKa)|W`  
} 0e4{{zQx  
##*3bDf$-5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) zF<R'XP  
{ =H8;iS2R  
 if(pMsg -> message == WM_KEYDOWN) ?tbrbkx  
 { *] X'( /b_  
  if(pMsg -> wParam == VK_ESCAPE) ez$(c  
   return TRUE; Lf&kv7Wj  
  if(pMsg -> wParam == VK_RETURN) '=pU^Oz<}  
   return TRUE; |{ip T SH  
 } .k !{*  
 return CDialog::PreTranslateMessage(pMsg); 7. oM J  
} ]a`$LW}  
?@86P|19  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @ 6vIap|  
{ 1qA;/-Zr<o  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 2+XA X:YD  
  SaveBmp(); oEv 'dQ9  
  return FALSE; upmx $H>  
} @yYkti;4-  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ /{I$#:M  
 CMenu pop; Bzf^ivT3L  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6gDN`e,@  
 CMenu*pMenu=pop.GetSubMenu(0); XCQs2CHt  
 pMenu->SetDefaultItem(ID_EXITICON); \FaP|28h  
 CPoint pt; ~n_HP_Kf?  
 GetCursorPos(&pt); 5 qA'  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); (bS&D/N.  
 if(id==ID_EXITICON) gSj,E8-g  
  DeleteIcon(); flx(HJK  
 else if(id==ID_EXIT) (ZlU^Gw#UB  
  OnCancel(); LghfM"g  
 return FALSE; n$R)>n Y  
} x8|J-8A(  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ueNS='+m  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 53 h0UL  
 AddIcon(); * T1_;4i  
 return res; uxz^/Gk  
} 2~V*5~fb  
]:n,RO6  
void CCaptureDlg::AddIcon() 3so %gvY.'  
{ j~MI<I+l[  
 NOTIFYICONDATA data; pgo$ 61  
 data.cbSize=sizeof(NOTIFYICONDATA); E{(;@PzE  
 CString tip; :4|4=mkr  
 tip.LoadString(IDS_ICONTIP); j>kqz>3  
 data.hIcon=GetIcon(0); RnN!2K  
 data.hWnd=GetSafeHwnd(); :(%5:1W  
 strcpy(data.szTip,tip); &^nGtW%a 9  
 data.uCallbackMessage=IDM_SHELL; K sCyFp  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; l^ }c!  
 data.uID=98; :T~  [  
 Shell_NotifyIcon(NIM_ADD,&data); !r-F>!~  
 ShowWindow(SW_HIDE); 7>RY/O;Z,  
 bTray=TRUE; 6LhTBV  
} )/P}?` I  
Ys7]B9/1O  
void CCaptureDlg::DeleteIcon() FI.\%x  
{ Hr C+Yjp  
 NOTIFYICONDATA data; 9YGY,s x  
 data.cbSize=sizeof(NOTIFYICONDATA); 4M T 7`sr  
 data.hWnd=GetSafeHwnd(); i#O SC5ZI  
 data.uID=98; 7 8,n%=nG  
 Shell_NotifyIcon(NIM_DELETE,&data); A}!J$V:w]  
 ShowWindow(SW_SHOW); d-%hjy3N  
 SetForegroundWindow(); d zMb5puH  
 ShowWindow(SW_SHOWNORMAL); $~kA B8z  
 bTray=FALSE; 18Emi<&A  
} + T+#q@  
u? EN  
void CCaptureDlg::OnChange() @VI@fN  
{ SX#&5Ka/  
 RegisterHotkey(); QV8g#&z  
} /_.|E]  
=pr7G+_u  
BOOL CCaptureDlg::RegisterHotkey() ~"bV L[  
{ ?A0)L27UE&  
 UpdateData(); g2]Qv@nxw  
 UCHAR mask=0; iRBfx  
 UCHAR key=0; ` %}RNC  
 if(m_bControl) kf9X$d6   
  mask|=4; BLFdHB.$T  
 if(m_bAlt) tX[WH\(xI  
  mask|=2; g{LP7 D;6  
 if(m_bShift) eH,or,r  
  mask|=1; d=^z`nt !R  
  key=Key_Table[m_Key.GetCurSel()]; 62u4-}JzF  
 if(bRegistered){ 1mJ Hued=6  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); < Z$J<]I  
  bRegistered=FALSE; ,z6~?6m  
 } (% 9$!v{3  
 cMask=mask; |?9HU~B  
 cKey=key;  lRQYpc\  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); D'4\*4is  
 return bRegistered; 8k79&|  
} 31)&vf[[  
JS77M-Ac  
  四、小结 `h;[TtIX4  
8Y?;x}  
  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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