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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: *1`q x+1  
  k!)Pl,nJ  
  一、实现方法 bTepTWv  
 O3~7  
  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: PDNbhUAV  
=GJ)4os  
#pragma data_seg("shareddata") E@[ZwTnJ  
HHOOK hHook =NULL; //钩子句柄 u%b.#!  
UINT nHookCount =0; //挂接的程序数目 y1OpZ  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 1.IEs:(;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 )y"8Bx=x4  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey :TkR]bhm  
static int KeyCount =0; fb|%)A=  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 hy wy(b3  
#pragma data_seg() 2`P=ekF]  
S2<evs1d  
  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。 zr@H Yl  
Gph:'3 *X  
  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: J>N^FR9  
&3CC |  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 6BH P#B2j  
cKey,UCHAR cMask) @5tGI U;1  
{ %Fp 1c K  
 BOOL bAdded=FALSE; ,.]1N:   
 for(int index=0;index<MAX_KEY;index++){ JDP/vNq  
  if(hCallWnd[index]==0){ (,^jgv|I  
   hCallWnd[index]=hWnd; `BzjDI:a  
   HotKey[index]=cKey; _;'<}a  
   HotKeyMask[index]=cMask; hF`Qs  
   bAdded=TRUE; K'U8ft*_  
   KeyCount++; 2}0S%R(  
   break; /vNHb _-  
  } ' o(7@   
 } 2#)z%K6T  
 return bAdded; ioJ|-@! #o  
} JyDg=%-$2  
//删除热键 V)jF]u~g  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) E'+?7ZGWj  
{ Zonr/sA~  
 BOOL bRemoved=FALSE; d*R('0z{  
 for(int index=0;index<MAX_KEY;index++){ @XQItc<  
  if(hCallWnd[index]==hWnd){ 8>AST,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ V(wANvH  
    hCallWnd[index]=NULL; 'dJ(x  
    HotKey[index]=0; 0HPqoen$  
    HotKeyMask[index]=0; bwyj[:6l  
    bRemoved=TRUE; N}CeQ'l[R  
    KeyCount--; uy rS6e0  
    break; w^E$R  
   } HyC826~-rI  
  } @&9, 0 x  
 } RfQ*`^D  
 return bRemoved; wu~?P`  
} 3A!Qu$r9  
TrR=3_;.7  
cm17hPe`}n  
  DLL中的钩子函数如下: e N^6gub  
K9QC$b9(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) WPDi)U X  
{ Z3O_K  
 BOOL bProcessed=FALSE; Lq]t6o ]  
 if(HC_ACTION==nCode) LO@o`JF  
 { bzyy;`;6Q~  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Nq"J[l*+g  
   switch(wParam) w=kW~gg  
   {  5bo')^xa  
    case VK_MENU: ]/[$3rPwZ  
     MaskBits&=~ALTBIT; P2 fiK  
     break; kzmw1*J  
    case VK_CONTROL: ,b9!\OWDF  
     MaskBits&=~CTRLBIT; EI8KKo *  
     break; :=?od 0]W  
    case VK_SHIFT: 9s&dN  
     MaskBits&=~SHIFTBIT; MeDlsO  
     break; {y`n _  
    default: //judge the key and send message SYA0Hiw7P  
     break; 1T0s UIY  
   } q);@iiJ-  
   for(int index=0;index<MAX_KEY;index++){ cCv@f ks  
    if(hCallWnd[index]==NULL) F*p@hl  
     continue; S7(tGD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )St`}qu;  
    { f0"_ {\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); O"9Or3w  
     bProcessed=TRUE; ` M!'PMX  
    } N) '|l0x0  
   } @Px_\w  
  } A7R [~  
  else if((lParam&0xc000ffff)==1){ //有键按下 A`nzqe#(1  
   switch(wParam) =3|5=ZU034  
   { h3j`X'  
    case VK_MENU: 09J,!NN  
     MaskBits|=ALTBIT; jIjW +D`  
     break; OZ4%6/  
    case VK_CONTROL: l*b0uF  
     MaskBits|=CTRLBIT; U*\ 1d  
     break; ]23+ d/  
    case VK_SHIFT: ZVDi;   
     MaskBits|=SHIFTBIT; 9`cj9zz7  
     break; C:p`  
    default: //judge the key and send message 6ag0c&k  
     break; wRu\9H}  
   } rO]2we/B,4  
   for(int index=0;index<MAX_KEY;index++){ juB/?'$~  
    if(hCallWnd[index]==NULL) tN0?  
     continue; :'Tq5kE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <~  ?LU^  
    { ld7B{ ?]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ZM_-g4[H  
     bProcessed=TRUE; P\&n0C~  
    } Ygc.0VKMR  
   } ;aDYw [  
  } JfzfxfM  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 2#@-t{\3-p  
   for(int index=0;index<MAX_KEY;index++){ V(M7d>N5G  
    if(hCallWnd[index]==NULL) &IP`j~ b  
     continue; 3bagL)'iz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) qRCUkw} fs  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :?:R5_Nd=  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 vu3zZMl  
   } emG1Wyl  
  } o$Z]qhq  
 } O +Xu ?W]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;-VXp80J  
} 4o kZ  
v*^'|QyM7  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: bdj')%@n  
v,c;dlg_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @Uqcym.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); scyv]5Hm!  
1 Ay.^f  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: KNSMx<GP  
4R& pb1eF  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) B:fulgh2ni  
{ +@MG$*}Oz  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6JD~G\$  
 { +K48c,gt?  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 BP=<TRp .  
  SaveBmp(); .2SD)<}(9  
  return FALSE; aPHNX)  
 } sM@1Qyv&0  
 …… //其它处理及默认处理 ?zK\!r{  
} K}tC8D  
b"eG8  
}T"&4Rvs2R  
  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。 0>yu Bgh  
i.''\  
  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。 F+9(*|x%  
I]Vkaf I>(  
  二、编程步骤 a>#]d  
_^p\ u  
  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.Qb/97@  
@UW*o&pGqL  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 4d%QJ7y  
U?j[ 8z  
  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; c Sktm&SP  
5 &s<&h  
  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; *_eY +\j  
qTV.DCP  
  5、 添加代码,编译运行程序。 )b-KF}]d  
afye$$X  
三、程序代码 x*wr8$@J  
-fDW>]_  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL _aw49ag;  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) oI x!?,1  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ]>,Lw=_[_  
#if _MSC_VER > 1000 \8]("l}ms8  
#pragma once trlZ  
#endif // _MSC_VER > 1000 Cg]S`R-  
#ifndef __AFXWIN_H__ v(^;%  
#error include 'stdafx.h' before including this file for PCH &W N R{  
#endif iM~qSRb#mJ  
#include "resource.h" // main symbols `Lr|KuFN  
class CHookApp : public CWinApp @O HsM?nW  
{ Gy!bPVe  
 public: Im@Yx^gc   
  CHookApp(); $Fv|w9  
  // Overrides #X*=oG  
  // ClassWizard generated virtual function overrides 8\m[Nuq5  
  //{{AFX_VIRTUAL(CHookApp) vzZ"TSP  
 public: **F-#",  
  virtual BOOL InitInstance(); +uMK_ds~  
  virtual int ExitInstance(); m>+ e;5  
  //}}AFX_VIRTUAL _q`f5*Z[  
  //{{AFX_MSG(CHookApp) JjQ9AJ?-V  
  // NOTE - the ClassWizard will add and remove member functions here. F*=}}H/  
  // DO NOT EDIT what you see in these blocks of generated code ! )gNVJ  
  //}}AFX_MSG r_3=+  
  DECLARE_MESSAGE_MAP() Y {2L[5_1  
}; qnnP*15`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); P*kC>lvSv  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); eKL3Y_5p@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )`}4rD^b  
BOOL InitHotkey(); }c'T]h\S  
BOOL UnInit(); zX&wfE8T  
#endif iH)-8Q  
1p(9hVA  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. n@9R|biO  
#include "stdafx.h" d2*uY.,  
#include "hook.h" HQV#8G#B  
#include <windowsx.h> n(jrK9]  
#ifdef _DEBUG nh>lDfJV<  
#define new DEBUG_NEW pGsu#`t  
#undef THIS_FILE =5#sB*  
static char THIS_FILE[] = __FILE__; 94L>%{59  
#endif mxl"Y&l2<  
#define MAX_KEY 100 2,G9~<t  
#define CTRLBIT 0x04 en29<#8TO  
#define ALTBIT 0x02 ?$%2\"wX~7  
#define SHIFTBIT 0x01 ~s>Ud<l%r  
#pragma data_seg("shareddata") _+. )8   
HHOOK hHook =NULL; z&Lcl{<MA  
UINT nHookCount =0; "K#zY~>L  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey =B"^#n ;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ^zR*s |1Q  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey {@>6E8)H5  
static int KeyCount =0; z:JJ>mxV  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift F^X:5g~K  
#pragma data_seg() dU#} Tk  
HINSTANCE hins; zE]h]$oi  
void VerifyWindow(); 8Xz \,}$O  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $ cYKVhf  
//{{AFX_MSG_MAP(CHookApp) '~[JV>5  
// NOTE - the ClassWizard will add and remove mapping macros here. 9oxn-)6JC  
// DO NOT EDIT what you see in these blocks of generated code! IeGVLC  
//}}AFX_MSG_MAP :PQvt/-'(D  
END_MESSAGE_MAP() l6< bV#_qe  
tQcn%CK  
CHookApp::CHookApp() 3/4r\%1b+  
{ 4! DXj0^  
 // TODO: add construction code here, 6_O3/   
 // Place all significant initialization in InitInstance *."50o=T  
} !Q5NV4gd+  
n^%",*8gD*  
CHookApp theApp; _:VIlg U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }vt>}%%  
{ 7kh(WtUz  
 BOOL bProcessed=FALSE; 'klYGp  
 if(HC_ACTION==nCode) br4 %(w(d  
 { yIma7H@=L  
  if((lParam&0xc0000000)==0xc0000000){// Key up GaLQ/V2R  
   switch(wParam) R9O1#s^  
   { ,2lH*=m;  
    case VK_MENU: zfm#yDf  
     MaskBits&=~ALTBIT; i E)Fo.H  
     break; Q a3+9  
    case VK_CONTROL: D@o8Gerq~  
     MaskBits&=~CTRLBIT; '*n2<y  
     break; )jed@?  
    case VK_SHIFT: 3Jw}MFFV  
     MaskBits&=~SHIFTBIT; mI-9=6T_  
     break; n@y*~sG]  
    default: //judge the key and send message x4;ndck%U  
     break; YQ7tZl;:t  
   } >m8~Fs0  
   for(int index=0;index<MAX_KEY;index++){ -*~~ 00w  
    if(hCallWnd[index]==NULL) QZamf lk  
     continue; e\' =#Hw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z;6,,  
    { L<_zQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7r wNjY#  
     bProcessed=TRUE; Z'o'd_g>I+  
    } : 5<u!-}  
   } E  *{_=pX  
  } }g_\?z3gt  
  else if((lParam&0xc000ffff)==1){ //Key down C^nTLw;K  
   switch(wParam) HR$;QHl~F  
   { @V qI+5TA  
    case VK_MENU: W,ik ;P\  
     MaskBits|=ALTBIT; pX]"^f1?O  
     break; >0.a#-u^  
    case VK_CONTROL: ?$0t @E  
     MaskBits|=CTRLBIT; 8 ;o*c6+  
     break; l[M?"<Ot;  
    case VK_SHIFT: y(*#0fJrTV  
     MaskBits|=SHIFTBIT; hO0g3^  
     break; G~KYFNHr  
    default: //judge the key and send message tW} At  
     break; nv_9Llh=z  
   } ]c\d][R N  
   for(int index=0;index<MAX_KEY;index++) W;!)Sj4<T!  
   { 0=V -{  
    if(hCallWnd[index]==NULL) KIYs[0*k  
     continue; {q|Om?@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^>m"j6`h,  
    { QV9 z81[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); jRNDi_u?Wb  
     bProcessed=TRUE; )jHH-=JM  
    } eD?f|bif  
   } &AhkP=Yw  
  } zHk7!|%Y  
  if(!bProcessed){ TI}Y U  
   for(int index=0;index<MAX_KEY;index++){ q@Oe}  
    if(hCallWnd[index]==NULL) B):hm  
     continue; vw[i.af  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;)rXQm  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~(K{D D7[N  
   } g0>Q* x  
  } C}Ucyzfr,p  
 } \TnRn(Kw  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); R;`C;Rbf  
} wi@Qf6(mn  
h #(J6ht  
BOOL InitHotkey() l-<EG9m@  
{ 6"<q{K  
 if(hHook!=NULL){ tl+ 9SBl  
  nHookCount++; f&NXWo/  
  return TRUE; B`wrr8"Rz  
 } 0=Mu|G|Z  
 else _FtsO<p)"  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); QI*<MF,1  
  if(hHook!=NULL) `e^sQ>rDI  
   nHookCount++; }b=Cv?Zg$m  
  return (hHook!=NULL); h"t\x}8qq  
} {{@*  
BOOL UnInit() olca Z  
{ y{Vh?Z<E  
 if(nHookCount>1){ 5`p>BJ+n  
  nHookCount--; vXT>Dc2\!  
  return TRUE; +~f=L- >  
 } g[$4a4X  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ]'5 G/H5?;  
 if(unhooked==TRUE){ s"B+),Jod  
  nHookCount=0; <BjrW]pM  
  hHook=NULL; M<'He.n  
 } IA680^  
 return unhooked; \@m^w"Ij  
} 2sH1) ,\  
?tx."MZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) OZ, Xu&N  
{ 6|Xe ],u  
 BOOL bAdded=FALSE; |&U{ z?  
 for(int index=0;index<MAX_KEY;index++){ I'0{Q`}  
  if(hCallWnd[index]==0){ tR(nD UHV5  
   hCallWnd[index]=hWnd; ~Xz?H=}U+  
   HotKey[index]=cKey; 9nS fFGu  
   HotKeyMask[index]=cMask; bk:mk[  
   bAdded=TRUE; OTzuOP 8  
   KeyCount++; u7lO2 C7  
   break; k8z1AP  
  } $rm/{i_7  
 } +aOQ'*g  
 return bAdded; p} {H%L  
} M< /  
ziC%Q8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) CaR-Yk   
{ IPf>9#L  
 BOOL bRemoved=FALSE; v n4z C  
 for(int index=0;index<MAX_KEY;index++){ SM\qd4  
  if(hCallWnd[index]==hWnd){ (nAL;:$x2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ZdgzPs"  
    hCallWnd[index]=NULL; tmi)LRF H  
    HotKey[index]=0; _{/[&vJ  
    HotKeyMask[index]=0; &yG5w4<  
    bRemoved=TRUE; -tfUkGdx;l  
    KeyCount--; 'OvM  
    break; Q)im2o@z  
   } 33g$mUB  
  } iFnD`l 6)  
 } .F G%QFF~  
 return bRemoved; yxAy1P;dX  
} Ll .P>LH  
FG^lh  
void VerifyWindow() sE&1ZJ]7  
{ HI7w@V8Ed  
 for(int i=0;i<MAX_KEY;i++){ O L 9(~p  
  if(hCallWnd!=NULL){ " =6kH,  
   if(!IsWindow(hCallWnd)){ nJ h)iQu  
    hCallWnd=NULL; rn/~W[  
    HotKey=0; 9{ #5~WP  
    HotKeyMask=0; yK-DzAv  
    KeyCount--; ~LQzt@G4  
   } K&eT*JW>  
  } qA"BoSw4  
 } Ph8@V}80"Y  
} W4UK?#S+  
iBI->xU[U  
BOOL CHookApp::InitInstance() `x_}mdR  
{ uVTacN%X  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); #nw+U+qL  
 hins=AfxGetInstanceHandle(); h'?v(k!  
 InitHotkey(); <Zvvx  
 return CWinApp::InitInstance(); .N( X. C  
} `]^W#6l  
n'0r (  
int CHookApp::ExitInstance() .f"1(J8  
{ @JGFG+J}  
 VerifyWindow(); %uCsCl  
 UnInit(); |Z)}-'QUJ  
 return CWinApp::ExitInstance(); ] E:NmBN<  
} @dx 8{oQ  
5z =}o/?  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file k7j.VpN9  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 4XAs^>N+  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 2vh }:A_  
#if _MSC_VER > 1000 @yo6w}3+-  
#pragma once 4EmdQn  
#endif // _MSC_VER > 1000 zc$}4o  
N`?|~g3  
class CCaptureDlg : public CDialog AUu<@4R7  
{ NGJst_  
 // Construction (T%?@'\  
 public: eL~3CAV{  
  BOOL bTray; )[oP `Z  
  BOOL bRegistered; b.v +5=)B  
  BOOL RegisterHotkey(); OF03]2j7<|  
  UCHAR cKey; }xBDyr63  
  UCHAR cMask; E- [Eg  
  void DeleteIcon(); V:>r6  
  void AddIcon(); 0N~kq-6.\  
  UINT nCount; ?|98Y"w  
  void SaveBmp(); (~o"*1fk>  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor '&e8;X  
  // Dialog Data FvY=!U06  
  //{{AFX_DATA(CCaptureDlg) k1oJ<$ Q  
  enum { IDD = IDD_CAPTURE_DIALOG }; DP0@x+`k  
  CComboBox m_Key; ~M8|r!_  
  BOOL m_bControl; Cf9{lhE8  
  BOOL m_bAlt; 6 &0r/r  
  BOOL m_bShift; v? OUd^  
  CString m_Path; kJpO0k9?eY  
  CString m_Number; TY'c'u,  
  //}}AFX_DATA [T,Hpt  
  // ClassWizard generated virtual function overrides 2x9.>nwhb  
  //{{AFX_VIRTUAL(CCaptureDlg) W=3#oX.GsU  
 public: #4./>}G  
  virtual BOOL PreTranslateMessage(MSG* pMsg); $}{[_2  
 protected: Vjs'|%P7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {kw% 7}!  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); /]^Y\U^  
  //}}AFX_VIRTUAL fge h;cD  
  // Implementation ti (Hx  
 protected: 57EX#:a  
  HICON m_hIcon; Le:C8^  
  // Generated message map functions [^s;Ggi9  
  //{{AFX_MSG(CCaptureDlg) H`'a|Y  
  virtual BOOL OnInitDialog(); w7.,ch  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1Acs0` 3  
  afx_msg void OnPaint(); ?'Hd0)yZ  
  afx_msg HCURSOR OnQueryDragIcon(); LWm1j:0  
  virtual void OnCancel(); bm 4RRI  
  afx_msg void OnAbout(); Y!_{:2H8p  
  afx_msg void OnBrowse(); PPH;'!>s"  
  afx_msg void OnChange(); B}[f]8jrM  
 //}}AFX_MSG 0&j90J$`  
 DECLARE_MESSAGE_MAP() 0FtwDM))  
}; zWhj >Za  
#endif YLi6G Y  
/AAD Fa  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file cM3B5Lp  
#include "stdafx.h" M:GpyE%  
#include "Capture.h" J@2wPKh?Yp  
#include "CaptureDlg.h" |Z94@uB  
#include <windowsx.h> )~)l^0X  
#pragma comment(lib,"hook.lib") nH&z4-1Y?  
#ifdef _DEBUG NLY=o@<  
#define new DEBUG_NEW Lc5zu7ncg  
#undef THIS_FILE IHdA2d?.]  
static char THIS_FILE[] = __FILE__; ,|s*g'u  
#endif A5J41yH  
#define IDM_SHELL WM_USER+1 v}N\z2A  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |(Mxbprz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {'tfU  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; $BMXjXd}  
class CAboutDlg : public CDialog @, GL&$Y:W  
{ \Q(a`6U  
 public: Lv]%P.=[G  
  CAboutDlg(); "A"YgD#t  
  // Dialog Data Qy0w'L/@  
  //{{AFX_DATA(CAboutDlg) bf0,3~G,P  
  enum { IDD = IDD_ABOUTBOX }; o+&Om~W  
  //}}AFX_DATA JR#4{P@A  
  // ClassWizard generated virtual function overrides J)Y`G4l2@  
  //{{AFX_VIRTUAL(CAboutDlg) rAfz?  
 protected: u+r!;-0i  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ao8ua|:  
  //}}AFX_VIRTUAL Y4 HN1  
  // Implementation #WSqh +  
 protected: %]&$VVVh  
  //{{AFX_MSG(CAboutDlg) qvSYrnpn  
  //}}AFX_MSG :Q>e54]'&  
  DECLARE_MESSAGE_MAP() p$9Aadi]  
}; / Qd` ?  
U,#x\[3!Jt  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) lQ`=PFh  
{ :>{!%-1Z  
 //{{AFX_DATA_INIT(CAboutDlg) H^*AaA9-   
 //}}AFX_DATA_INIT A6]X aF  
} ~q}L13^k  
(g@\QdH`|  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) mdEJ'];AH  
{ 0|Fx Sc  
 CDialog::DoDataExchange(pDX); 'Og@<~/Xy  
 //{{AFX_DATA_MAP(CAboutDlg) ?&#LmeZ}K  
 //}}AFX_DATA_MAP Bh2l3J4X  
} <[)-Q~Gg5  
W&Fm ;m@M  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 9GH5  
 //{{AFX_MSG_MAP(CAboutDlg) vvv'!\'#  
 // No message handlers yiQ?p:DM  
 //}}AFX_MSG_MAP d-B+s%>D  
END_MESSAGE_MAP() m6mGcbpn  
__'4Qt   
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) (T#$0RFq  
: CDialog(CCaptureDlg::IDD, pParent) Cjr]l!  
{  RbTGAA  
 //{{AFX_DATA_INIT(CCaptureDlg) KhfADqji|  
  m_bControl = FALSE; JE-*o"&  
  m_bAlt = FALSE; Bk~C$'x4  
  m_bShift = FALSE; bh1$ A  
  m_Path = _T("c:\\"); W+#Q>^Q>  
  m_Number = _T("0 picture captured."); ")No t$8  
  nCount=0; |T""v_q  
  bRegistered=FALSE; 'JMW.;Lh?X  
  bTray=FALSE; *^|\#UIk  
 //}}AFX_DATA_INIT ?d-w#<AiV  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 BA: x*(%~  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 'c7nh{F  
} x^[,0?y2  
6]b"n'G  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) aNEah  
{ z qq  
 CDialog::DoDataExchange(pDX); z;>$["t]6  
 //{{AFX_DATA_MAP(CCaptureDlg) hU""YP ~y  
  DDX_Control(pDX, IDC_KEY, m_Key); 9KU&M"Yq&i  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); /ovVS6Ai  
  DDX_Check(pDX, IDC_ALT, m_bAlt); d-_V*rYU  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); %m |I=P  
  DDX_Text(pDX, IDC_PATH, m_Path); ZX:rqc  
  DDX_Text(pDX, IDC_NUMBER, m_Number); }4YzP 4  
 //}}AFX_DATA_MAP HXa[0VOx  
} 7x6 M]1F  
adP  :{j  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Lmte ~oBi  
//{{AFX_MSG_MAP(CCaptureDlg) mp8GHV  
 ON_WM_SYSCOMMAND() 88osWo6rG  
 ON_WM_PAINT() -{cmi,oy  
 ON_WM_QUERYDRAGICON() ,XO@ZBOM  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) a ~v$ bNu  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) xc#t8`  
 ON_BN_CLICKED(ID_CHANGE, OnChange) N x&/p$d  
//}}AFX_MSG_MAP ~|} ]  
END_MESSAGE_MAP() Rsfb?${0G  
M9W zsWM  
BOOL CCaptureDlg::OnInitDialog() r&E gP  
{ =%7drBoD  
 CDialog::OnInitDialog(); nXRa_M(z8  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); L5FOlzn  
 ASSERT(IDM_ABOUTBOX < 0xF000); [_'A(.  
 CMenu* pSysMenu = GetSystemMenu(FALSE); y{hg4|\  
 if (pSysMenu != NULL) }:IIk-JoC  
 { cpjwc@UMe  
  CString strAboutMenu; H:c5 q0O^x  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 9i5?J]o^  
  if (!strAboutMenu.IsEmpty()) (lM,'  
  { X 61|:E  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9S|sTf  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \ZLi Y  
  } }#ZRi}f2VJ  
 } ]#]Z]9w  
 SetIcon(m_hIcon, TRUE); // Set big icon &|k=mxox\  
 SetIcon(m_hIcon, FALSE); // Set small icon .kBkYK8*t  
 m_Key.SetCurSel(0); <t"T'\3  
 RegisterHotkey(); V6][*.i!9  
 CMenu* pMenu=GetSystemMenu(FALSE); [;z\bV<S  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); *<xu3){:c  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); uslu-|b!%  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); "@nH;Xlq  
 return TRUE; // return TRUE unless you set the focus to a control 4?+K `  
} l/G +Xj4M  
dxs5woP  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) %VO+\L8Fs  
{ 'Bue*  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) h:8P9WhWF  
 { +06{5-,  
  CAboutDlg dlgAbout; @A1f#Ed<  
  dlgAbout.DoModal(); $t;:"i>  
 } 7~XC_Yc1  
 else Z`tmuu  
 { 1jg* DQ7L  
  CDialog::OnSysCommand(nID, lParam); 4,sE{%vb  
 } cz9J&Le>  
} 0~ho/_  
zzf@U&x<  
void CCaptureDlg::OnPaint() E#KZZ lbx  
{ r W`7<3  
 if (IsIconic()) 5 b} w  
 { S&!(h {O  
  CPaintDC dc(this); // device context for painting jKml:)k  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?kO.>o  
  // Center icon in client rectangle g5nJ0=9  
  int cxIcon = GetSystemMetrics(SM_CXICON); B r#{  
  int cyIcon = GetSystemMetrics(SM_CYICON); OvX&5Q5  
  CRect rect; F=Bdgg9s  
  GetClientRect(&rect); r/sSkF F  
  int x = (rect.Width() - cxIcon + 1) / 2; GI]\  
  int y = (rect.Height() - cyIcon + 1) / 2; sv=U^xI  
  // Draw the icon |jiIx5qr  
  dc.DrawIcon(x, y, m_hIcon); \V$qAfP)  
 } \AwkK3  
 else n2mO-ZXud  
 { H4y9\ -  
  CDialog::OnPaint(); ^N/d`IAjv  
 } r ]7: ?ir  
} X9Ch(nWX  
:PT{>r[  
HCURSOR CCaptureDlg::OnQueryDragIcon() =>;&M)+q  
{ &4-;;h\H  
 return (HCURSOR) m_hIcon; * 1;4&/93o  
} ^`kwSC  
b-<0\@`Z#  
void CCaptureDlg::OnCancel() v?VDASR2`  
{ _;k<=ns(=  
 if(bTray) ,H{9`a#+:  
  DeleteIcon(); c7XBZ%D  
  CDialog::OnCancel(); &+#5gii1i  
} Yg8* )u0  
-P;0<j@6k5  
void CCaptureDlg::OnAbout() # sw4)*v  
{ v.(dOIrX  
 CAboutDlg dlg; sE[`x^1'8  
 dlg.DoModal(); 712nD ?>  
} +aOdaNcI  
%LrOGr  
void CCaptureDlg::OnBrowse() DquL r+s~  
{ G(7%*@SX  
 CString str; i O$87!  
 BROWSEINFO bi; ~M}{rl.n=  
 char name[MAX_PATH]; }b\hRy~=r  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); }nlS&gew^  
 bi.hwndOwner=GetSafeHwnd(); J%CCUl2  
 bi.pszDisplayName=name; relt7sK  
 bi.lpszTitle="Select folder"; \U$:/#1Oe  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; v[Q)L!J1  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); i#la'ICwJ  
 if(idl==NULL) QCb D^  
  return; %R >n5m  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 1Vu#:6%  
 str.ReleaseBuffer(); e`n ZiM>  
 m_Path=str; !i"zM}  
 if(str.GetAt(str.GetLength()-1)!='\\') $9`#p/V  
  m_Path+="\\"; uHKEt[PS$  
 UpdateData(FALSE); *a Z1 4  
} 76!LMNf  
:i<*~0r<  
void CCaptureDlg::SaveBmp() JdS,s5Z>  
{ R;!,(l  
 CDC dc; !mxH/{+|n  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); BEOPZ[Q|c  
 CBitmap bm; hWy@?r.  
 int Width=GetSystemMetrics(SM_CXSCREEN); +cH>'OXoB  
 int Height=GetSystemMetrics(SM_CYSCREEN); iAz0 A  
 bm.CreateCompatibleBitmap(&dc,Width,Height); fmixWL7.Zg  
 CDC tdc; jfMkN  
 tdc.CreateCompatibleDC(&dc); qx ki  
 CBitmap*pOld=tdc.SelectObject(&bm); (I~   
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); n[Q(q[ULV  
 tdc.SelectObject(pOld); r-y;"h'  
 BITMAP btm; _Ay^v#a  
 bm.GetBitmap(&btm); UQu6JkbLL  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; :(A&8<}-6  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); q}Q G<%VR  
 BITMAPINFOHEADER bih; $9X+dvu*  
 bih.biBitCount=btm.bmBitsPixel; 6.)ug7aF  
 bih.biClrImportant=0; LTe ({6l0  
 bih.biClrUsed=0; gF,=rT1:>r  
 bih.biCompression=0; }i8y/CA  
 bih.biHeight=btm.bmHeight; #^L&H oo6  
 bih.biPlanes=1; pWxk^qhe/  
 bih.biSize=sizeof(BITMAPINFOHEADER); _RaE: )  
 bih.biSizeImage=size; 3 2z4G =l  
 bih.biWidth=btm.bmWidth; u ]"fwkL  
 bih.biXPelsPerMeter=0; 67(s\  
 bih.biYPelsPerMeter=0; }.A]=Ew  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); !Vyf2xS"  
 static int filecount=0; )h,y Q`.  
 CString name; )NZH{G  
 name.Format("pict%04d.bmp",filecount++); i M !`4  
 name=m_Path+name; -zFJ)!/?  
 BITMAPFILEHEADER bfh; (vG*)a  
 bfh.bfReserved1=bfh.bfReserved2=0; S($/Ov  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Z{B  e  
 bfh.bfSize=54+size; I,hw0e  
 bfh.bfOffBits=54; `PbY(6CF  
 CFile bf; zpwoK&T+  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ RvAgv[8  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); `0qjaC  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 66& uK|  
  bf.WriteHuge(lpData,size); $bG*f*w  
  bf.Close(); Br!;Ac&N  
  nCount++; HS <Jp44  
 } r,JQR)l0@V  
 GlobalFreePtr(lpData); /Z6lnm7wJ  
 if(nCount==1) B/;> v  
  m_Number.Format("%d picture captured.",nCount); *V kaFQZ$,  
 else M*0^<e~]F  
  m_Number.Format("%d pictures captured.",nCount); q? ">  
  UpdateData(FALSE); bh@CtnO  
} 9I/l+IS"X  
PRU&y/zZmG  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -W9DH^EL<  
{ WJD2(el  
 if(pMsg -> message == WM_KEYDOWN) jQ V[zcM  
 { p9)YRLOh.  
  if(pMsg -> wParam == VK_ESCAPE) Q/SO%E`E  
   return TRUE; )Dz]Pv]H'  
  if(pMsg -> wParam == VK_RETURN) ym|7i9  
   return TRUE; L ?/AKg  
 } S=,czs3N  
 return CDialog::PreTranslateMessage(pMsg); l6bY!I>  
} A M[f  
ycBgr,Ynu<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3JGrJ!x  
{ D\_nqx9O  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 3WP\MM  
  SaveBmp(); RFRXOyGz$  
  return FALSE; g8.z?Ia#5Z  
} IB&G#2M<  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ /ugWl99.W  
 CMenu pop; 8|zavH#P  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); n$C- ^3 c  
 CMenu*pMenu=pop.GetSubMenu(0); nriSVGi  
 pMenu->SetDefaultItem(ID_EXITICON); OdFF)-K >~  
 CPoint pt; i(|u g_^  
 GetCursorPos(&pt); a(vt"MQ_  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); IVPN=jg?  
 if(id==ID_EXITICON) q'8*bu_  
  DeleteIcon(); Rj";?.R*e  
 else if(id==ID_EXIT) 71@ eJQ  
  OnCancel(); #$Zx].[lc  
 return FALSE; p?L%'  
} (e'8>Pv  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); R Th=x.  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) O8 .iP+  
 AddIcon(); v's1 &%sM  
 return res; D;P=\i>9-  
} BSMb(EnqX  
Led\S;pl  
void CCaptureDlg::AddIcon() '! ^7 *@z  
{ 2L&c91=wE  
 NOTIFYICONDATA data; lW?}Ts ~'  
 data.cbSize=sizeof(NOTIFYICONDATA); q7lC}'2fu  
 CString tip;  [p6:uNo  
 tip.LoadString(IDS_ICONTIP); ]B )nN':  
 data.hIcon=GetIcon(0); c ?CD;Pk  
 data.hWnd=GetSafeHwnd(); r x9*/Q0F  
 strcpy(data.szTip,tip); p(pfJ^/:(  
 data.uCallbackMessage=IDM_SHELL; PV#h_X<l%  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; B6dU6"  
 data.uID=98; !-`L1D_hy  
 Shell_NotifyIcon(NIM_ADD,&data); %w^*7Oi  
 ShowWindow(SW_HIDE); ULt5Zi  
 bTray=TRUE; zH~P-MqC  
} MJiVFfYW  
ntH`\ )xi  
void CCaptureDlg::DeleteIcon() F2 B(PGa7  
{ h |]cZMGo  
 NOTIFYICONDATA data; OpaRQ=  
 data.cbSize=sizeof(NOTIFYICONDATA); :j`f%Vg~x  
 data.hWnd=GetSafeHwnd(); h"ZIh= j@  
 data.uID=98; ;J|t-$Z  
 Shell_NotifyIcon(NIM_DELETE,&data); xF{%@t  
 ShowWindow(SW_SHOW); iz=cjmV?  
 SetForegroundWindow(); '/<\X{l8  
 ShowWindow(SW_SHOWNORMAL); "a2|WKpD  
 bTray=FALSE; 4vbGXb}!  
} `n>|rd  
\'Ca1[y@B  
void CCaptureDlg::OnChange() sAc1t`  
{ R*pPUw\yn  
 RegisterHotkey(); kFE9}0-   
} *{VC<<`  
-ZE YzZqY  
BOOL CCaptureDlg::RegisterHotkey() qfXt%6L  
{ {{G3^ysa  
 UpdateData(); AM=,:k$  
 UCHAR mask=0; )ItABl[{  
 UCHAR key=0; [ifw}(  
 if(m_bControl) 0JtM|Mg  
  mask|=4; DU6j0lz  
 if(m_bAlt) LN+x!#:e  
  mask|=2; *KNfPh#wi}  
 if(m_bShift) 9~`#aQG T  
  mask|=1; xwo *kFg  
  key=Key_Table[m_Key.GetCurSel()]; wKi#5k2  
 if(bRegistered){ ^S`hKv&87  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 2n3&uvf'TL  
  bRegistered=FALSE; f5F-h0HF`[  
 } bz>\n"'  
 cMask=mask; K W&muD  
 cKey=key; HsTY*^V  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); R=.?el  
 return bRegistered; =)Hu(;Yv  
} nam]eW  
Jw5@#j  
  四、小结 oo;<I_#07  
\bT0\ (Js\  
  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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