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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: I"4Lma  
  2NNAsr}L  
  一、实现方法 E/OJ}3Rf  
-$; h+9BO  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: b,k%n_&n  
rmzM}T\20  
#pragma data_seg("shareddata") Ub(8ko:8$  
HHOOK hHook =NULL; //钩子句柄 nQ$4W  
UINT nHookCount =0; //挂接的程序数目 m,u5S=3A{!  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 S m%\,/3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 +p:?blG  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey (D?%(f  
static int KeyCount =0; 4F-r}Fj3  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 BeNH"Y:E  
#pragma data_seg() Gl4(-e'b  
ek^=Z`  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 <8JV`dTywC  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: o)(N*tC  
P?zPb'UVqa  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR iut[?#f^  
cKey,UCHAR cMask) @AvDV$F  
{ ptCFW_UV  
 BOOL bAdded=FALSE; /^F_~.u{  
 for(int index=0;index<MAX_KEY;index++){ #)qn$&.H  
  if(hCallWnd[index]==0){ cIm_~HH  
   hCallWnd[index]=hWnd; (Ov{gj^  
   HotKey[index]=cKey; )t$<FP  
   HotKeyMask[index]=cMask; /YyimG7  
   bAdded=TRUE; _D{V(c<WD  
   KeyCount++; \BoRYb9h  
   break; M<AjtDF%  
  } ;T9u$4 <  
 } tR! !Q  
 return bAdded; |<Cz#| ,q  
} 3k#?E]'  
//删除热键 ae&i]K;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) TIs~?wb$  
{ TpHvZ]c  
 BOOL bRemoved=FALSE; DaA9fJ7a   
 for(int index=0;index<MAX_KEY;index++){ d~G, *  
  if(hCallWnd[index]==hWnd){ 9L`5r$/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ F7FUoew<  
    hCallWnd[index]=NULL; NFVr$?P  
    HotKey[index]=0; 61XLL/=P  
    HotKeyMask[index]=0; Ve]ufn6  
    bRemoved=TRUE; e(5 :XHe  
    KeyCount--; :jJ;&t^^  
    break; 8RA]h?$$J  
   } v>p UVM  
  } U #u=9%'  
 } <l:c O$ m  
 return bRemoved; Y<x;-8)*  
} #><P28m  
]uikE2nn  
jHU5>Gt-}  
  DLL中的钩子函数如下: ja<!_^h=At  
5i<E AKL  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) p#]D-?CM)  
{ E`"<t:RzF  
 BOOL bProcessed=FALSE; c}QWa"\2n  
 if(HC_ACTION==nCode) csEF^T-  
 { H*gX90{!2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Z4"SKsJT/>  
   switch(wParam) 65P*Gu?  
   {  Ib~n}SA  
    case VK_MENU: *VbB'u:  
     MaskBits&=~ALTBIT; _ $ Wj1h  
     break; (i 3=XfZ!C  
    case VK_CONTROL: fcim4dfP  
     MaskBits&=~CTRLBIT; >dr34=(  
     break; -$x5[6bN  
    case VK_SHIFT: ;Nd,K C0k  
     MaskBits&=~SHIFTBIT; r?:zKj8/u  
     break; $=IJ-_'o  
    default: //judge the key and send message F*0rpQ,*  
     break; (3_m[N\F  
   } Wubvvm8U  
   for(int index=0;index<MAX_KEY;index++){ "-WEUz  
    if(hCallWnd[index]==NULL) Bb~Q]V=x;  
     continue; 4YT d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ; qQ* p  
    { ^#V7\;v$G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); cLZaQsS%  
     bProcessed=TRUE; ~!PaBS3A  
    } Xcy Xju#"p  
   } c=^A3[AM  
  } [}GPo0GY  
  else if((lParam&0xc000ffff)==1){ //有键按下 [!<W{ ($5  
   switch(wParam) M9t`w-@_w  
   { /^2&@P7  
    case VK_MENU: wT taj08D  
     MaskBits|=ALTBIT; )zKZ<;#y  
     break; 4P>4d +  
    case VK_CONTROL: Dh4 EP/=z  
     MaskBits|=CTRLBIT; DJ!<:9FD  
     break; qubyZ8hx  
    case VK_SHIFT: S5,y!K]C~  
     MaskBits|=SHIFTBIT; &>YdX$8x  
     break; .!B>pp(9  
    default: //judge the key and send message (FY<% .Pa  
     break; M %vZcP  
   } @[s+5_9nk  
   for(int index=0;index<MAX_KEY;index++){ Yp;6.\Z8[  
    if(hCallWnd[index]==NULL) k*U(ln  
     continue; ,drcJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tn\PxT  
    { ;7HL/-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); C<T)'^7z  
     bProcessed=TRUE; w.:fl4V  
    } |)4aIa  
   } RyN}Gz/YN  
  } FUD M]:XQ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 vhEXtjL  
   for(int index=0;index<MAX_KEY;index++){ d4r@Gx%BE  
    if(hCallWnd[index]==NULL) nXg:lCI-uu  
     continue; @ uF$m/g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z0v|%&IK  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); m j!P ]  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 [8Yoz1(smA  
   } V+Tu{fFF7E  
  } \nKpJ9!  
 } m,qMRcDF  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 0&W*U{0F\  
} e*Y>+*2y  
B< 6E'  
  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: s^QXCmb$8  
k7R}]hq]""  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,t!K? Y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j@98UZ{g\  
mZgYR~  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: F s{}bQyQ  
 &3:U&}I  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) v?)u1-V0  
{ Or2J  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Ibbpy++d[  
 { Z7G l^4zn  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 .Jvy0B} B  
  SaveBmp(); [3~mil3rO  
  return FALSE; 0c,)T1NG>  
 } ~R$Ko(N  
 …… //其它处理及默认处理 pAY[XN  
} %z_L}L  
R oY"Haa  
XSv)=]{  
  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。 jW< aAd  
)d^b\On  
  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。 SR<*yO  
4_i6q u(4  
  二、编程步骤 1k:s~m?!  
;Q}pmBkqB  
  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"; #n5D K{e  
X  *f le  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; o(|fapK.  
GQvJj4LJp  
  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; Wb7z&vj  
\qA^3L~;5  
  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; G#f(oGn :  
vrr` ^UB2  
  5、 添加代码,编译运行程序。 @8$3Q,fF(  
(e~vrSk+)~  
三、程序代码 o<f#Zi  
~Bi{k'A9  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL MB#KLTwnT  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) A:JW Ux  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ C>0='@LB@r  
#if _MSC_VER > 1000 'C")X  
#pragma once n?EL\B   
#endif // _MSC_VER > 1000 @XSxoUF\  
#ifndef __AFXWIN_H__ K]0K/~>8  
#error include 'stdafx.h' before including this file for PCH )h&*b9[B=  
#endif OM1pyt  
#include "resource.h" // main symbols % QKlvmI"  
class CHookApp : public CWinApp a+_F^   
{ M?FbBJ`sF  
 public: `B GU  
  CHookApp(); a=%QckR*  
  // Overrides n~e#Y<IP\1  
  // ClassWizard generated virtual function overrides :{tj5P!S  
  //{{AFX_VIRTUAL(CHookApp) g 218%i  
 public: BGSqfr1F  
  virtual BOOL InitInstance(); 5"cYZvGkJ  
  virtual int ExitInstance(); >_m4 idq1  
  //}}AFX_VIRTUAL @?gN &Z)I  
  //{{AFX_MSG(CHookApp) iJsa;|2/  
  // NOTE - the ClassWizard will add and remove member functions here. ^;xO-;q  
  // DO NOT EDIT what you see in these blocks of generated code ! (4 6S^*  
  //}}AFX_MSG |-'.\)7:  
  DECLARE_MESSAGE_MAP() h5>38Kd  
}; {z j<nu  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); -g6C;<Y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {W5D)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l*0`{R  
BOOL InitHotkey(); A>OGU ^  
BOOL UnInit(); %J 'RO  
#endif CNRiK;nQ  
[ ]LiL;A&  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. "p[FFg  
#include "stdafx.h" 320g!r  
#include "hook.h" ?->&)oAh  
#include <windowsx.h> VdfV5"  
#ifdef _DEBUG pSml+A:  
#define new DEBUG_NEW ap% Y}  
#undef THIS_FILE r!,/~~m T  
static char THIS_FILE[] = __FILE__; $>M A  
#endif 3~uWrZ.u  
#define MAX_KEY 100 GA.4'W^&a  
#define CTRLBIT 0x04 rdY/QvP0=  
#define ALTBIT 0x02 g'Id3 1r'  
#define SHIFTBIT 0x01 oP0ZJK&;  
#pragma data_seg("shareddata") -?K?P=B;X  
HHOOK hHook =NULL; ?{bAyh/  
UINT nHookCount =0; *wY { ~zh  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey nOE 1bf^l  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT kpU-//lk+  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey kl90w  
static int KeyCount =0; 5 Y|(i1  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Ksu_4dE  
#pragma data_seg() /t<C_lLM  
HINSTANCE hins; 3|FZ!8D  
void VerifyWindow(); z$q:Y g  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $kM8E@x2  
//{{AFX_MSG_MAP(CHookApp) >FRJvZ6  
// NOTE - the ClassWizard will add and remove mapping macros here. HcKZmL. wp  
// DO NOT EDIT what you see in these blocks of generated code! sIZ|N"2]A*  
//}}AFX_MSG_MAP 6'^Gh B  
END_MESSAGE_MAP() UVIR P#  
B&Igm<72x  
CHookApp::CHookApp() = IkG;gg  
{ e=<%{M&  
 // TODO: add construction code here, >dTJ  
 // Place all significant initialization in InitInstance Fm3f/]>k#_  
} 6x _tX  
H |K}m,g  
CHookApp theApp; =%Yw;% 0)Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) yN Bb(!u  
{ -UhGacw  
 BOOL bProcessed=FALSE; = Nd &My  
 if(HC_ACTION==nCode) fjh0Z i45  
 { 1 iWe&I:  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8UANB]@Y}  
   switch(wParam) s7~[7  
   { wB0zFlP  
    case VK_MENU: @A-^~LoP.  
     MaskBits&=~ALTBIT; p 7YfOUo k  
     break; 5 1\N+  
    case VK_CONTROL: Gw;[maM!%`  
     MaskBits&=~CTRLBIT; Q6r!=yOEY  
     break; KC`~\sYRN]  
    case VK_SHIFT: Q;3 v ]h_  
     MaskBits&=~SHIFTBIT; 4GY:N6qe '  
     break; UQ ~7,D`=#  
    default: //judge the key and send message 0qV"R7TW  
     break; @fVCGV?'  
   } 6a=Y_fma  
   for(int index=0;index<MAX_KEY;index++){ I'NE>!=Q  
    if(hCallWnd[index]==NULL) 2EdKxw3$]  
     continue; ^6Std x_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t#p*{S 3u  
    { hjgxCSp  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -'sn0 _q/e  
     bProcessed=TRUE; A>c/q&WUk  
    } V=C@ocy Z  
   } _cW (R,i  
  } 6.!3g(w   
  else if((lParam&0xc000ffff)==1){ //Key down 9b0M'x'W5  
   switch(wParam) M_4:~&N$  
   { $)5-}NJf'  
    case VK_MENU: 5G-}'-R  
     MaskBits|=ALTBIT; !Hk$  t  
     break; LcA~a<_  
    case VK_CONTROL: }#rdMh  
     MaskBits|=CTRLBIT; 9_6.%qj&  
     break; \G}$+  
    case VK_SHIFT: <Rl:=(]i~  
     MaskBits|=SHIFTBIT; V`n;W6Q17  
     break; *FwHZZ~U  
    default: //judge the key and send message LQnkpy3A  
     break; ^lP_{ c  
   } ?QnVWu2K  
   for(int index=0;index<MAX_KEY;index++) 0V:DeX$bZ  
   { B f_oIc  
    if(hCallWnd[index]==NULL) :jFKTG  
     continue; !"dbK'jb^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~[CtsCiQ  
    { u I \zDR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ||lI_B  
     bProcessed=TRUE; g]z[!&%Ahs  
    } iZVMDJ?(Z]  
   } B~/LAD_  
  } WB=pRC@  
  if(!bProcessed){ C y b-}l  
   for(int index=0;index<MAX_KEY;index++){ g36\%L  
    if(hCallWnd[index]==NULL) vlD!YNy  
     continue; 4<['%7U_[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) yvgn}F{}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); jQKlJi2xu  
   } \xH#X=J  
  } "\'g2|A  
 } r/![ohrEB  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -,;Iob56!  
} Zm:Wig ,a  
_Gf.1Bsf@S  
BOOL InitHotkey() fC2   
{ \k=.w  
 if(hHook!=NULL){ |vZ\tQ  
  nHookCount++; 7I6bZ;}d  
  return TRUE; :\*<EIk(  
 } ,6zH;fi  
 else y=H^U.  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); GnE%C2L -  
  if(hHook!=NULL) R?Dbv'lp>  
   nHookCount++; idC4yH42  
  return (hHook!=NULL); 2 NgEzY 5  
} 0`KB|=>  
BOOL UnInit() M1MpR+7S  
{ 5pBQ~m3  
 if(nHookCount>1){ ::y+|V/  
  nHookCount--; ]y'/7U+  
  return TRUE; (O N \-*  
 } <bwsK,C  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ? [?{X~uq  
 if(unhooked==TRUE){ yn0OPjH  
  nHookCount=0; \}ujSr#<  
  hHook=NULL; wo>srZs  
 } EBY=ccGE{  
 return unhooked; VOYuog 5o  
} 6 1= ?(Iw  
)p-B@5bb  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) r@xMb,!H  
{ %`%xD>![  
 BOOL bAdded=FALSE; _jw A_  
 for(int index=0;index<MAX_KEY;index++){ {(7D=\eU  
  if(hCallWnd[index]==0){ uv++Kj!  
   hCallWnd[index]=hWnd; fb5]eec  
   HotKey[index]=cKey; 7L[HtwI  
   HotKeyMask[index]=cMask; |S5N$[  
   bAdded=TRUE; 6?/$K{AI  
   KeyCount++; <By R!Y  
   break; 8t$a8 PE  
  } t5z6{`  
 } `  L(AvSR  
 return bAdded; Ojkbv  
} ^|6%~jkD5  
W^2Q"c#7F  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {d\erG(  
{ kU8V,5  
 BOOL bRemoved=FALSE; 4]N`pD5  
 for(int index=0;index<MAX_KEY;index++){ 2kTLj2 @o,  
  if(hCallWnd[index]==hWnd){ AW8"@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /3*75  
    hCallWnd[index]=NULL; x@F"ZiYD@O  
    HotKey[index]=0; G 1{F_  
    HotKeyMask[index]=0; 8k$iz@e  
    bRemoved=TRUE; %d+:0.+`n  
    KeyCount--; IB x?MU#.  
    break; +igFIoHTM  
   } td@F%*  
  } R>"E Xq  
 } " }@QL`  
 return bRemoved; z.g'8#@  
} @WX]K0 $;  
{m9OgR5U  
void VerifyWindow() &0O1tM*v  
{ 5Qp5JMK  
 for(int i=0;i<MAX_KEY;i++){ 1\7SiQ-  
  if(hCallWnd!=NULL){ "D7*en  
   if(!IsWindow(hCallWnd)){ ;p"G<n  
    hCallWnd=NULL; Z8$@}|jN  
    HotKey=0; rN)T xH&*p  
    HotKeyMask=0; pR8]HNY0  
    KeyCount--; :K&   
   } E[J7FgU)<S  
  } tr2@{xb  
 } 22L#\qVkl  
} XF1x*zc  
0X\,!FL  
BOOL CHookApp::InitInstance() >2 gemTy  
{ vN%zk(?T  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); dOq*W<%  
 hins=AfxGetInstanceHandle(); w \pD'1e  
 InitHotkey(); QQKvy0?1  
 return CWinApp::InitInstance(); Cw]Q)rX{  
} E9 QA<w  
0@E[IDmp  
int CHookApp::ExitInstance() \GeUX <Fl  
{ -OZRSjmY  
 VerifyWindow(); 5gg_c?Vh/  
 UnInit(); @`U78)]  
 return CWinApp::ExitInstance(); %@L(A1"#D  
} lhAwTOn`Q  
n{pS+u z  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Tn[DF9;?  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) -p`hevRr  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ bL+Hw6;  
#if _MSC_VER > 1000 b/oJ[Vf  
#pragma once F#@Mf?#2  
#endif // _MSC_VER > 1000 #rzq9}9tB  
Q"CZ}B1<  
class CCaptureDlg : public CDialog \$s<G|<P  
{ *&>1A A  
 // Construction $O&P@8:Z  
 public: w-[WJ:2.  
  BOOL bTray; .l5y !?  
  BOOL bRegistered; Zb`}/%\7  
  BOOL RegisterHotkey(); pL>Q'{7s3  
  UCHAR cKey; kRnh20I  
  UCHAR cMask; m.-l&@I2/<  
  void DeleteIcon(); *G$tfb(  
  void AddIcon(); W,YzD&f=uS  
  UINT nCount; wFpt#_fS  
  void SaveBmp(); 4xU[oaa  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor InMeD[*^  
  // Dialog Data G@h6>O  
  //{{AFX_DATA(CCaptureDlg) 13s!gwE)  
  enum { IDD = IDD_CAPTURE_DIALOG }; =0`"T!1  
  CComboBox m_Key; ]7v-qd  
  BOOL m_bControl; _h7!  
  BOOL m_bAlt; +Tde#T&[  
  BOOL m_bShift; ? )-*&1cv  
  CString m_Path; eh nN  
  CString m_Number; (7`&5m d  
  //}}AFX_DATA 4p&qH igG  
  // ClassWizard generated virtual function overrides (L8H.|.  
  //{{AFX_VIRTUAL(CCaptureDlg) W'rft@J$  
 public: wH~Q4)#=o  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ]q7\  
 protected: aDR<5_Yb  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $I~=t{;"XV  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ( }5k"9Z  
  //}}AFX_VIRTUAL _Qs )~  
  // Implementation /s uz>o\  
 protected: e-H:;m5R  
  HICON m_hIcon; +ww paR`  
  // Generated message map functions J`;G9'n2  
  //{{AFX_MSG(CCaptureDlg) ,ju1:`  
  virtual BOOL OnInitDialog(); 8$-Wz:X&  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); MOP %vS   
  afx_msg void OnPaint(); e2UbeP  
  afx_msg HCURSOR OnQueryDragIcon(); E}mnGe  
  virtual void OnCancel(); c, \TL ]  
  afx_msg void OnAbout(); `4}zB#3  
  afx_msg void OnBrowse(); )!hDF9O  
  afx_msg void OnChange(); d4/snvq  
 //}}AFX_MSG fXvJ3w(  
 DECLARE_MESSAGE_MAP() TLl*gED  
}; S *?'y  
#endif aePhtQF  
R*/%+  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 3\|e8(bc  
#include "stdafx.h" }k7@ X  
#include "Capture.h" `;*%5WD%  
#include "CaptureDlg.h" SoS[yr  
#include <windowsx.h> %#2[3N{  
#pragma comment(lib,"hook.lib") J:)Q)MT24:  
#ifdef _DEBUG x "]%q^x  
#define new DEBUG_NEW 6cVaO@/(  
#undef THIS_FILE fyYT#r  
static char THIS_FILE[] = __FILE__; c^}gJ  
#endif cG6Q$  
#define IDM_SHELL WM_USER+1 h" Yi'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5W>i'6*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); yp wVzCUG  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; A5z`_b4f  
class CAboutDlg : public CDialog K=M5d^K<E  
{ NtkEb :  
 public: 5R?iTB1,  
  CAboutDlg(); a"EP`  
  // Dialog Data zv||&Hi  
  //{{AFX_DATA(CAboutDlg) KR%p*Nh+C  
  enum { IDD = IDD_ABOUTBOX }; + B%fp*  
  //}}AFX_DATA nYY@+%` ]z  
  // ClassWizard generated virtual function overrides &9, 6<bToP  
  //{{AFX_VIRTUAL(CAboutDlg) {$bAs9L  
 protected: &!2 4l=!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ae{% * \J  
  //}}AFX_VIRTUAL pq#Hca[  
  // Implementation > YKvwbCf8  
 protected: <w+K$WE {  
  //{{AFX_MSG(CAboutDlg) HGs.v}@&  
  //}}AFX_MSG v0jRoE#  
  DECLARE_MESSAGE_MAP() 4&!`Yi_1L  
}; }I}RqD:`  
7ml,  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ? Sj,HLo@U  
{ IX']s;b  
 //{{AFX_DATA_INIT(CAboutDlg) D&0*+6j((  
 //}}AFX_DATA_INIT <`9Q{~*=t  
} acdaDY  
M'$n".,p  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) WM*[+8h  
{ R"];`F(#  
 CDialog::DoDataExchange(pDX); gsGwf[XdJ  
 //{{AFX_DATA_MAP(CAboutDlg) o>311(:  
 //}}AFX_DATA_MAP L0qo/6|C  
} Z9cch- u~  
@ T'!;)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Dh BUMDoB  
 //{{AFX_MSG_MAP(CAboutDlg) ;yqJEj_m(  
 // No message handlers ce.'STm=  
 //}}AFX_MSG_MAP (\e,,C%;  
END_MESSAGE_MAP() W=&\d`><k  
HtgVD~[]  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 8TD:~ee  
: CDialog(CCaptureDlg::IDD, pParent) P7&a~N$T6W  
{ `8\ _ ]w0  
 //{{AFX_DATA_INIT(CCaptureDlg) /P<RYA~  
  m_bControl = FALSE; %L=ro qz  
  m_bAlt = FALSE; _' Xt  
  m_bShift = FALSE; R4 ;^R  
  m_Path = _T("c:\\"); u^s{r`/  
  m_Number = _T("0 picture captured."); =&U JFu  
  nCount=0; NYM$0v`0YK  
  bRegistered=FALSE; $fPf/yQmC  
  bTray=FALSE; vY7C!O/y_k  
 //}}AFX_DATA_INIT k=Pu4:RF  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $^INl0Pg  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); V?kJYf(<  
} D*|h c  
Mou>|U 1e"  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) |#^u%#'[2  
{ XG@_Lcv*  
 CDialog::DoDataExchange(pDX); \vT0\1:|i  
 //{{AFX_DATA_MAP(CCaptureDlg) 8RVNRV@g%  
  DDX_Control(pDX, IDC_KEY, m_Key); 2shr&M fp[  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); m@;X%wf<U  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ZtlF]k:MV  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 67+ K ?!,  
  DDX_Text(pDX, IDC_PATH, m_Path); gs_"H  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Os?G_ziIB  
 //}}AFX_DATA_MAP kn 5q1^  
} m4<8v  
usZmf=p-r  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ,v4Z[ (  
//{{AFX_MSG_MAP(CCaptureDlg) X4!` V?  
 ON_WM_SYSCOMMAND() F6dm_Oq&  
 ON_WM_PAINT() ~QJD.'z  
 ON_WM_QUERYDRAGICON() !sfOde)$  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 8E H# IiP  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) sycN  
 ON_BN_CLICKED(ID_CHANGE, OnChange) O _yJR  
//}}AFX_MSG_MAP 9IIQon  
END_MESSAGE_MAP() Vz1ro  
lj/ ?P9  
BOOL CCaptureDlg::OnInitDialog() i*:lZeU61  
{ #[ vmS  
 CDialog::OnInitDialog(); r50}j  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); >k<.bEx(A  
 ASSERT(IDM_ABOUTBOX < 0xF000); ?5K.#>{  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Us+|L|/  
 if (pSysMenu != NULL) rV<yM$IA  
 { 2P`hdg  
  CString strAboutMenu; bU/5ug.  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ;eI,1 [_  
  if (!strAboutMenu.IsEmpty()) K 4j'e6  
  { x/ {  
   pSysMenu->AppendMenu(MF_SEPARATOR); BT: =  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); k|F<?:C  
  } SouPk/-B80  
 } @aN<nd`q)  
 SetIcon(m_hIcon, TRUE); // Set big icon n7i;^=9 mM  
 SetIcon(m_hIcon, FALSE); // Set small icon X3tpW`alo  
 m_Key.SetCurSel(0); x$QOOE]  
 RegisterHotkey(); ,'v]U@WK  
 CMenu* pMenu=GetSystemMenu(FALSE); (Gf1#,/3~  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); cF_ Y}C  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (5]<t&M  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); F8$.K*tT  
 return TRUE; // return TRUE unless you set the focus to a control B_i@D?bTD  
} |lm   
 poGF  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) lsU|xOB  
{ i=OPl  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) |!euty ::  
 { 6AKH0t|4  
  CAboutDlg dlgAbout; u3(zixb  
  dlgAbout.DoModal(); Q@6OIE  
 } G4{ zt3{  
 else zGHP{a1O7  
 { j!B+Q  
  CDialog::OnSysCommand(nID, lParam); B f~  
 } JOS,>;;F4  
} |GM?4'2M.  
G&)A7WaC  
void CCaptureDlg::OnPaint() &?f{.  
{ &%+}bt5  
 if (IsIconic()) T~J6(,"  
 { R(@B4M2  
  CPaintDC dc(this); // device context for painting Z@>hN%{d+g  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); wASgdGoy  
  // Center icon in client rectangle kzny4v[y  
  int cxIcon = GetSystemMetrics(SM_CXICON); mw!D|  
  int cyIcon = GetSystemMetrics(SM_CYICON); $YSAD\a<  
  CRect rect; )WF]v"t  
  GetClientRect(&rect); r" d/ 9  
  int x = (rect.Width() - cxIcon + 1) / 2; cq>{  
  int y = (rect.Height() - cyIcon + 1) / 2; P95U{   
  // Draw the icon 2>Hl=bX  
  dc.DrawIcon(x, y, m_hIcon); =hxj B*")  
 } .xS3,O_[  
 else 0%+S@_|  
 { dnTB$8&  
  CDialog::OnPaint(); *&9_+F8ly  
 } <e-9We."  
} Qu,W3d  
 ;)s$Et%  
HCURSOR CCaptureDlg::OnQueryDragIcon() wkOo8@J\  
{ 6+u}'mSj8  
 return (HCURSOR) m_hIcon; ~KHGh29  
} ,#hS#?t   
ZgQ4~s  
void CCaptureDlg::OnCancel() +kP)T(6  
{ t}>6"^}U  
 if(bTray) *%5 .{J!  
  DeleteIcon(); x9k(mn%,  
  CDialog::OnCancel(); C&YJvMu  
} |Wd]:ijJ  
`9E:V=  
void CCaptureDlg::OnAbout() @GDe{GG+  
{ h[b5"Uqj  
 CAboutDlg dlg; 3}e-qFlV8,  
 dlg.DoModal(); CG*eo!Nw  
} 3B!lE(r%J  
Cx2s5vJX4p  
void CCaptureDlg::OnBrowse() wi^zXcVj  
{ eQ`TW'[9_6  
 CString str; 0O<g) %Vz>  
 BROWSEINFO bi; xpCzx=n3.m  
 char name[MAX_PATH]; W+36"?*k3  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Q]]}8l2  
 bi.hwndOwner=GetSafeHwnd(); <@6K(  
 bi.pszDisplayName=name; 3>Y G  
 bi.lpszTitle="Select folder"; S L<P`H|  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Vp{! Ft8>  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); A:PQIcR;V  
 if(idl==NULL) Wd#r-&!6j  
  return; QH@?.Kb_qU  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); G8dC5+h  
 str.ReleaseBuffer(); ,e$]jC<sv2  
 m_Path=str; RnC96"";R.  
 if(str.GetAt(str.GetLength()-1)!='\\') gEcRJ1Q;C  
  m_Path+="\\"; hEla8L4Y  
 UpdateData(FALSE); 12qX[39/  
} lx _jy>$}r  
vVB8zS~l ,  
void CCaptureDlg::SaveBmp() VM=A#}  
{ uJ<n W%}  
 CDC dc; lVF}G[B  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); "#1KO1@G  
 CBitmap bm; V'?bZcRr~  
 int Width=GetSystemMetrics(SM_CXSCREEN); f'&30lF  
 int Height=GetSystemMetrics(SM_CYSCREEN); ]S;^QZ  
 bm.CreateCompatibleBitmap(&dc,Width,Height); d S]TTU1  
 CDC tdc; ,l/~epx4v)  
 tdc.CreateCompatibleDC(&dc); hG51jVYtw  
 CBitmap*pOld=tdc.SelectObject(&bm); L c4\i  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); YHBH9E/B  
 tdc.SelectObject(pOld); j_H"m R  
 BITMAP btm; g(Q)fw  
 bm.GetBitmap(&btm); 9RA~#S|(T  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ~,[-pZ <  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); :U;n?Zu S  
 BITMAPINFOHEADER bih; Y~z3fd  
 bih.biBitCount=btm.bmBitsPixel; Ua0fs|t1v  
 bih.biClrImportant=0; '-C%?*ku  
 bih.biClrUsed=0; vF yl,S5A  
 bih.biCompression=0; Xq:jp+WSG  
 bih.biHeight=btm.bmHeight; #-vuY#gs  
 bih.biPlanes=1; XgRrJ.  
 bih.biSize=sizeof(BITMAPINFOHEADER); Wm ri%  
 bih.biSizeImage=size; >%Rb}Ki4  
 bih.biWidth=btm.bmWidth; .m%/JquMFM  
 bih.biXPelsPerMeter=0; E57:ap)/  
 bih.biYPelsPerMeter=0; 6r  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); );EW(7KeL  
 static int filecount=0; XG_h\NIL  
 CString name; OXu*w l(z  
 name.Format("pict%04d.bmp",filecount++); pT3p!/pl3  
 name=m_Path+name; tuH8!.  
 BITMAPFILEHEADER bfh; Itq248+Ci  
 bfh.bfReserved1=bfh.bfReserved2=0; @ 3n;>oi  
 bfh.bfType=((WORD)('M'<< 8)|'B'); <[iw1>  
 bfh.bfSize=54+size; *Iy5 V7`KU  
 bfh.bfOffBits=54; 5?6U@??]  
 CFile bf; D<=x<.  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ R>Q&Ax  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); '"u>;Bq  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8 KDF*%7'  
  bf.WriteHuge(lpData,size); 'dJ#NT25  
  bf.Close(); ;Q*=AW  
  nCount++; ]`@= ;w  
 } c%|K x  
 GlobalFreePtr(lpData); Jv_KZDOdk  
 if(nCount==1) 2XoFmV),F  
  m_Number.Format("%d picture captured.",nCount); E|R^tETb  
 else 8{DZew /  
  m_Number.Format("%d pictures captured.",nCount); ;rwjqUDBz  
  UpdateData(FALSE); > mI1wV[  
} dL{zU4iUR  
7b>FqW)%  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) R"@J*\;$T  
{ H}v.0R  
 if(pMsg -> message == WM_KEYDOWN) '+?L/|'  
 { $glt%a  
  if(pMsg -> wParam == VK_ESCAPE) 2AYV9egZ  
   return TRUE; Ek'~i  
  if(pMsg -> wParam == VK_RETURN) +=.>9  
   return TRUE; hG1\  
 } o8<0#W@S  
 return CDialog::PreTranslateMessage(pMsg); b!(ew`Y;  
} rq#8}T>  
]rwHr;.  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kH;DAphk  
{ z"7I5N  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ BhAWIH8@C  
  SaveBmp(); M$Sq3m`{!  
  return FALSE; k OYF]^uJ  
} %63zQFk  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ h"C7l#u  
 CMenu pop; U&F1}P$fb  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 2pr#qh8  
 CMenu*pMenu=pop.GetSubMenu(0); 7Iz%Jty  
 pMenu->SetDefaultItem(ID_EXITICON); d7, ZpHt  
 CPoint pt; Hlh`d N  
 GetCursorPos(&pt); [D;wB|+,  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); n8h1S lK08  
 if(id==ID_EXITICON) \!-IY  
  DeleteIcon(); _LVwjZX[  
 else if(id==ID_EXIT) ,=TY:U;?  
  OnCancel(); V]E# N  
 return FALSE; MH wjJ  
} 4o/}KUu(*  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); rE->z  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) y4N8B:j%  
 AddIcon(); dUt$kB  
 return res; rC !!X  
} RSv?imi=  
u92);1R  
void CCaptureDlg::AddIcon() IKz3IR eu  
{ : Xe,=M(l~  
 NOTIFYICONDATA data; 5OJ8o>BF  
 data.cbSize=sizeof(NOTIFYICONDATA); B=ckRW q  
 CString tip; ""~b1kEt  
 tip.LoadString(IDS_ICONTIP); a:q>7V|%$  
 data.hIcon=GetIcon(0); W;Pdbf"  
 data.hWnd=GetSafeHwnd(); %|"0p3  
 strcpy(data.szTip,tip); E O.Se9ux  
 data.uCallbackMessage=IDM_SHELL; f`;y "ba  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; d#tqa`@~  
 data.uID=98; i`nmA-Zj[  
 Shell_NotifyIcon(NIM_ADD,&data); a*hWODYn  
 ShowWindow(SW_HIDE); yr;~M{{4  
 bTray=TRUE; |_6V+/?"?`  
} kT-dQ32  
|2Krxi3*  
void CCaptureDlg::DeleteIcon() Oc,E\~  
{ ?&gqGU}  
 NOTIFYICONDATA data; (7X|W<xT  
 data.cbSize=sizeof(NOTIFYICONDATA); RJpRsr  
 data.hWnd=GetSafeHwnd(); zh.^> `   
 data.uID=98; o [ Je  
 Shell_NotifyIcon(NIM_DELETE,&data); Kl\g{>{Uz  
 ShowWindow(SW_SHOW); I ~U1vtgp  
 SetForegroundWindow(); )7aUDsu>4  
 ShowWindow(SW_SHOWNORMAL); *\-$.w)k  
 bTray=FALSE; CI#6 r8u  
} JJQS7,vG  
mBwM=LAZ  
void CCaptureDlg::OnChange() _YK66cS3E/  
{ ~vbyX  
 RegisterHotkey(); C {*' p+f  
} {+3 `{34e  
h]+UK14m  
BOOL CCaptureDlg::RegisterHotkey() u# TNW.  
{ '9ki~jtf=  
 UpdateData(); a<NZC  
 UCHAR mask=0; W>E/LBpE4  
 UCHAR key=0; +!~"o oQZh  
 if(m_bControl) K]{x0A  
  mask|=4; @%^JB  
 if(m_bAlt) #NyfE|MKBC  
  mask|=2; < NRnE8:  
 if(m_bShift) iJ&jg`"=F  
  mask|=1; P Nf_{4  
  key=Key_Table[m_Key.GetCurSel()]; Nc da~h Q  
 if(bRegistered){ g7UZtpLTm  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 4\_~B{kzZ  
  bRegistered=FALSE; k4E2OyCFoJ  
 } WR.>?IG2E  
 cMask=mask; >iV2>o_  
 cKey=key; +QW| 8b  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); mG*ER^Y@D  
 return bRegistered; ez-jVi-Fi  
} q\$k'(k>35  
{i^F4A@=Z  
  四、小结 $eq*@5B  
c:[8ng 2v  
  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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