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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: ~r?VXO p"  
  I"2*}v|  
  一、实现方法 x5eSPF1  
9}aEV 0 V|  
  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: @ 3,:G$,  
 Jju^4  
#pragma data_seg("shareddata") &/-}`hIAT  
HHOOK hHook =NULL; //钩子句柄 Z90]I<a~  
UINT nHookCount =0; //挂接的程序数目 #,Cz+ k*4  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 sTw+.m{F  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ^_\%?K_u  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey U*7x81v?j  
static int KeyCount =0; |?4NlB6  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ;_p!20.(  
#pragma data_seg() *b\&R%6dR  
z2[{3Kd*  
  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。 cSYMnB  
5 N:IH@  
  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: $Ahe Vps@@  
G]O5irsV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR V$3`y=8  
cKey,UCHAR cMask) [Lq9lw&   
{ ;={3H_{3  
 BOOL bAdded=FALSE; ].Xh=7&2{  
 for(int index=0;index<MAX_KEY;index++){ 1EA#c>I$  
  if(hCallWnd[index]==0){ !AN;  
   hCallWnd[index]=hWnd; #N;McF;W  
   HotKey[index]=cKey; R0YWe  
   HotKeyMask[index]=cMask; K#xL-   
   bAdded=TRUE; 2$FH+wuW  
   KeyCount++; e$o]f"(  
   break; zQaD&2 q  
  } w[OUGn'  
 } R$i-%3  
 return bAdded; )8;At'q}  
} ~9n30j%]s  
//删除热键 L"}tJM.d  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H7(D8.y )  
{ zV8{|-2]No  
 BOOL bRemoved=FALSE; ~{-9qOGw;  
 for(int index=0;index<MAX_KEY;index++){ U;t1 K  
  if(hCallWnd[index]==hWnd){ %BF,;(P  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ qIvnPaYW  
    hCallWnd[index]=NULL; [G' +s  
    HotKey[index]=0; j%=X ps  
    HotKeyMask[index]=0; (h'Bz6K  
    bRemoved=TRUE; r0*Y~ KHw  
    KeyCount--; iAZbh"I  
    break; sq?js#C5  
   } S ^$!n,  
  } JJy.)-R  
 } `\J,%J  
 return bRemoved; P~s u]+  
} D.gD4g_O/  
!wTrWD!  
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  DLL中的钩子函数如下: 2@Oz_?O=  
J;'H],w}f  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5}Z>N,4  
{ fGoJP[ae  
 BOOL bProcessed=FALSE;  C=qL0  
 if(HC_ACTION==nCode) ch33+~Nn  
 { a9NIK/9  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 "EwzuM8 f  
   switch(wParam) f4$sH/ 2#v  
   {  R5&<\RI0  
    case VK_MENU: kLc@U~M  
     MaskBits&=~ALTBIT; Hb0_QT~  
     break; aNP\Q23D  
    case VK_CONTROL: "r1 !hfIYf  
     MaskBits&=~CTRLBIT; 2}15FXgN  
     break; JJ9R, 8n6  
    case VK_SHIFT: o pTH6a  
     MaskBits&=~SHIFTBIT; D>0(*O  
     break; #HZ W57"  
    default: //judge the key and send message e8S4=W  
     break; Up0kTL  
   } i6<uj  
   for(int index=0;index<MAX_KEY;index++){ MV]`[^xQ5  
    if(hCallWnd[index]==NULL) \,'4eV  
     continue; (__$YQ-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) pog   
    { NS-0-o|4#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); o2[$X ONTl  
     bProcessed=TRUE; 8:[ l1d86  
    } _qk yU)z  
   } ld3H"p rR  
  } |AS~sjWSJ  
  else if((lParam&0xc000ffff)==1){ //有键按下 ae" o|Q  
   switch(wParam) A]ZQ?- L/  
   { Mfnfp{.)  
    case VK_MENU: %+/Dv  
     MaskBits|=ALTBIT; r+k&W  
     break; E1SWZ&';  
    case VK_CONTROL: bo1J'pU  
     MaskBits|=CTRLBIT; Swh\^/B8  
     break; E\TWPV'/  
    case VK_SHIFT: q3C  
     MaskBits|=SHIFTBIT; %7QSBL  
     break; m_.9 PZ  
    default: //judge the key and send message uIBN !\j  
     break; En)Ptz#0  
   } 0!oqP1  
   for(int index=0;index<MAX_KEY;index++){ ,4Q8r:_ u  
    if(hCallWnd[index]==NULL) 2|ej~}Y  
     continue; q"EW*k+ )  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X}Om)WCr  
    { n.t5:SW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Ve${g`7&  
     bProcessed=TRUE; a,(nf1@5  
    } 2qojU%fiH  
   } #%w+PL:*O  
  } maeQ'Sv_&  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 \iaZV.#f  
   for(int index=0;index<MAX_KEY;index++){  A@9\Qd  
    if(hCallWnd[index]==NULL) <v/aquLN  
     continue; :,fT^izew  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Zu2`IzrG#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wE"lk  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 |}UA=? Xl  
   } :aBm,q9i:}  
  } ]_|'N7J  
 } QUaV;6 4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +~ Hb}0ry  
} V^4v`}Wgx  
&*Xrh7K2e  
  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: d2d8,Vg  
#%F-Xsk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dm]g:KWg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RN|Bk  
u})*6l.  
  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: 7r^Cs#b+I  
(>E/C^Tc%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #d*0 )w  
{ ({@" {  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 5D2mZ/  
 { q*5L",  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 DBG0)=SHy  
  SaveBmp(); LT>_Y`5>  
  return FALSE; hW'b'x<  
 } ''D7Bat@  
 …… //其它处理及默认处理 ." gq[0_YS  
} j}d):3!  
DaJ,( DJY  
wEwR W  
  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。 *C0a,G4  
8EMBqhl  
  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。 cvo+{u$s  
dNY'uv&Y  
  二、编程步骤 Thu_`QP^  
U;IGV~oT  
  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"; $MGKGWx@E  
,X1M!'  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; CM$&XJzva  
rk4KAX_[  
  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; ;Z`a[\i':  
:3XvHL0rx  
  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; _'1 7C /  
Z,SV9 ~M  
  5、 添加代码,编译运行程序。 F_g(}wE# q  
]n>9(Mp!M  
三、程序代码 y z!L:1DG  
2wnk~URj  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL YFPse.2$a  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) pdER#7Tq  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 65JG#^)KaX  
#if _MSC_VER > 1000 *0Z6H-Do,  
#pragma once 3 !8#wn  
#endif // _MSC_VER > 1000 U, 7  
#ifndef __AFXWIN_H__ jnbR}a=fJ  
#error include 'stdafx.h' before including this file for PCH >~Gy+-  
#endif I4+1P1z  
#include "resource.h" // main symbols `?.6}*4@_A  
class CHookApp : public CWinApp O`1!&XT{x  
{ 5._QI/d)'J  
 public: 7O k-T10  
  CHookApp(); P^=B6>e  
  // Overrides 0^Vw^]w  
  // ClassWizard generated virtual function overrides a%BC{XX  
  //{{AFX_VIRTUAL(CHookApp) /3k[3  
 public: uL-kihV:-  
  virtual BOOL InitInstance(); &=*1[j\  
  virtual int ExitInstance(); E2dS@!]V  
  //}}AFX_VIRTUAL lhJY]tQt/  
  //{{AFX_MSG(CHookApp) t#_6GL  
  // NOTE - the ClassWizard will add and remove member functions here. llR5qq=t  
  // DO NOT EDIT what you see in these blocks of generated code ! )m3emMO2  
  //}}AFX_MSG Lg(G&ljE@k  
  DECLARE_MESSAGE_MAP() V`LE 'E  
}; ,mvFeo;@f  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); H)E,([   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ~Q Q1ZP3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~PQR_?1  
BOOL InitHotkey(); h lc!}{$%8  
BOOL UnInit(); XUh&an$  
#endif ^H2TSaJ;  
X]2Ib'(  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ,1B4FAR&  
#include "stdafx.h" S LeA,T  
#include "hook.h" -6uLww=w4  
#include <windowsx.h> 7VZ^J`3  
#ifdef _DEBUG Z.Z31yF:f  
#define new DEBUG_NEW U';)]vB$  
#undef THIS_FILE [tSv{  
static char THIS_FILE[] = __FILE__; PPrvVGP   
#endif ewN|">WXQ  
#define MAX_KEY 100 T"3LO[j+  
#define CTRLBIT 0x04 bv(+$YR  
#define ALTBIT 0x02 E&z^E2  
#define SHIFTBIT 0x01 ^`dMjeF  
#pragma data_seg("shareddata") 0S;Ipg  
HHOOK hHook =NULL; *y|w9 r p  
UINT nHookCount =0; c)N_"#&  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ZVJ6 {DS/  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT "QS(4yw?jg  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey g8&& W_BI  
static int KeyCount =0; 7Dl^5q.|  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift R+He6c!?9  
#pragma data_seg() I]5){Q" S  
HINSTANCE hins; h(}#s1Fzq  
void VerifyWindow(); > 2/j  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) H(- -hG5}  
//{{AFX_MSG_MAP(CHookApp) u81F^72U  
// NOTE - the ClassWizard will add and remove mapping macros here. {yT<22Fl  
// DO NOT EDIT what you see in these blocks of generated code! 8KigGhY'ms  
//}}AFX_MSG_MAP +/%4E %  
END_MESSAGE_MAP() G.iQ\'1_h  
MFO%F) 5  
CHookApp::CHookApp() ;,TT!vea  
{ --TH6j"  
 // TODO: add construction code here, n%;tVa  
 // Place all significant initialization in InitInstance kO^  
} rk&oKd_&i  
pX>wMc+  
CHookApp theApp; rGt]YG#C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ak3WER|f#  
{ w""u]b%:r  
 BOOL bProcessed=FALSE; Ktzn)7-  
 if(HC_ACTION==nCode) R6>*n!*D@  
 { &1=,?s]&  
  if((lParam&0xc0000000)==0xc0000000){// Key up Fd80T6[  
   switch(wParam) X=6L-^ o)  
   { hHcevSr  
    case VK_MENU: .3Smqwm=Y  
     MaskBits&=~ALTBIT; Vu~fF@ |  
     break; C'l\4ij)7  
    case VK_CONTROL: 2fc+PE  
     MaskBits&=~CTRLBIT; c<cYX;O  
     break; Yu&\a?]\2  
    case VK_SHIFT: m|+zMf&  
     MaskBits&=~SHIFTBIT; b+ZaZ\-y |  
     break; iK'A m.o+  
    default: //judge the key and send message AlrUfSBB  
     break; T}XJFV  
   } 6OPNP0@r  
   for(int index=0;index<MAX_KEY;index++){ yfFe%8w_vw  
    if(hCallWnd[index]==NULL) .1J`>T?=Q  
     continue; o4^#W;%w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f[*g8p  
    { m2l0`l~T8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6o^O%:0g  
     bProcessed=TRUE; v5I5tzt*%H  
    } L*P*^I^1  
   } )+"(7U<  
  } 1]W8A.ZS  
  else if((lParam&0xc000ffff)==1){ //Key down f7a"}.D $  
   switch(wParam) [U$`nnp  
   { 3t5W wrNh  
    case VK_MENU: e +jp,>(v  
     MaskBits|=ALTBIT; RDeI l&  
     break; Z1h6Y>j  
    case VK_CONTROL: -^*8D(j*  
     MaskBits|=CTRLBIT; ]vuxeu[cu,  
     break; djn<Oc`  
    case VK_SHIFT: t Kjk<  
     MaskBits|=SHIFTBIT; uG/b Cb+V  
     break; ug/P>0  
    default: //judge the key and send message MM~4D  
     break; % C)|fDwN  
   } l xP!WP  
   for(int index=0;index<MAX_KEY;index++) {M23a _t\  
   { 'N&s$XB,  
    if(hCallWnd[index]==NULL) F)50 6  
     continue; H:t2;Z'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t4p-pH'9b  
    { "/x/]Qx2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Of  nN  
     bProcessed=TRUE; m:g%5' qDZ  
    } zR%)@wh  
   } V.!z9AQ  
  } ioslarw1J  
  if(!bProcessed){ }]pOR&o  
   for(int index=0;index<MAX_KEY;index++){ 0Rn`63#  
    if(hCallWnd[index]==NULL) "VeNc,-nfQ  
     continue; m xy=3cUi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) r3YfY \  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); QaOF l` i  
   } 08$l=  
  } "-Uqv@  
 } >BjZ{7?Ok  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); hAB:;r XlI  
} 3ZAzv en  
I^O`#SA(  
BOOL InitHotkey() x&gS.b*  
{ !/"y  
 if(hHook!=NULL){ +7t:/_b~  
  nHookCount++; S3dcE"hg  
  return TRUE; Lf,C5 0  
 } 3UcOpq2i\  
 else UvGX+M,z'  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); YY$O"!."  
  if(hHook!=NULL) hw&~OJeo  
   nHookCount++; tY?evsVgz  
  return (hHook!=NULL); Zk # C!]=  
} } ejc  
BOOL UnInit() af/;Dr@  
{ ?nozB|*>ut  
 if(nHookCount>1){ !_:|mu'  
  nHookCount--; +s5Yg,4*  
  return TRUE; AH ]L C6-  
 } 8 =3$U+  
 BOOL unhooked = UnhookWindowsHookEx(hHook); rzKn5Z  
 if(unhooked==TRUE){ a@-!,Hi  
  nHookCount=0; =1j`VJU9  
  hHook=NULL; jE$]Z(Ab  
 } =l$qwcfbo  
 return unhooked; 2J7JEv|  
} &wB?ks  
zh4m`}p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t<qXXQ&5  
{ CHM+@lD  
 BOOL bAdded=FALSE; iu'rc/=V  
 for(int index=0;index<MAX_KEY;index++){ 3]/Y= A  
  if(hCallWnd[index]==0){ -axmfE?g0  
   hCallWnd[index]=hWnd; SA6.g2pFz  
   HotKey[index]=cKey; j"<F?k@`Q  
   HotKeyMask[index]=cMask; [u8JqX  
   bAdded=TRUE; V[">SiOg  
   KeyCount++; 1L.yh U\  
   break; +C(/.X Kz%  
  } E2|c;{ c  
 } oz?6$oE(bt  
 return bAdded; M+\LH  
} 5?MKx!%  
,:3Di (  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v&u8Ks  
{ =A^VzIj(  
 BOOL bRemoved=FALSE; {FM:\/  
 for(int index=0;index<MAX_KEY;index++){ 8KS9!*.iZ  
  if(hCallWnd[index]==hWnd){ qC YXkZ%`  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0bG2YMs  
    hCallWnd[index]=NULL; PciiDh~/  
    HotKey[index]=0; ON$-g_s>)  
    HotKeyMask[index]=0; Z65]|  
    bRemoved=TRUE; &M+fb4:_  
    KeyCount--; e@L7p,  
    break; +DP{_x)t  
   } Z+x`q#ZQr  
  } .Ue1}'v*,  
 } J+8T Ie  
 return bRemoved; Y&`nB,'  
} qXQ7Jg9  
2o-Ie/"d\  
void VerifyWindow() )V*V  
{ U*Pi%J  
 for(int i=0;i<MAX_KEY;i++){ Yc1ve  
  if(hCallWnd!=NULL){ m_1BB$lyP2  
   if(!IsWindow(hCallWnd)){ 38O_PK  
    hCallWnd=NULL; (:T\<  
    HotKey=0; W RVm^  
    HotKeyMask=0; ( cqVCys  
    KeyCount--; $F86Dwd  
   } 5J<ghv>\P  
  } S%m$LM]NCg  
 } eI*o9k$Qs  
} :w 4Sba3  
NX:i]t  
BOOL CHookApp::InitInstance() 2M+'9 +k~  
{ k M' :.QT  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); E:ocx2dp  
 hins=AfxGetInstanceHandle(); = eDi8A*~  
 InitHotkey(); ]Syr{|  
 return CWinApp::InitInstance(); / L/hR4  
} /0qLMlL$  
B@2VI 1%  
int CHookApp::ExitInstance() >~k"C,6  
{ YV>]c9!q  
 VerifyWindow(); X Sw0t8  
 UnInit(); 2N:|BO>  
 return CWinApp::ExitInstance(); cp>1b8l6?  
} /__@a&9t  
o Kfm=TbY  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [Dq!t1  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Qtpw0t"  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ DZ Q=Sinry  
#if _MSC_VER > 1000 Ljjuf=]  
#pragma once BSB;0OM  
#endif // _MSC_VER > 1000 /<$\)|r  
&*N;yW""f  
class CCaptureDlg : public CDialog F"Y.'my8  
{ Sq,x57-  
 // Construction Cl5l+I\1  
 public: &I$MV5)u  
  BOOL bTray; 8%wu:;*]%  
  BOOL bRegistered; /2e&fxxD  
  BOOL RegisterHotkey(); lUd;u*A  
  UCHAR cKey; 9vZD?6D,n  
  UCHAR cMask; N8^ AH8l  
  void DeleteIcon(); >ps=z$4j*  
  void AddIcon(); Qs5^kddz=  
  UINT nCount; <r'l5|er  
  void SaveBmp(); ^xwnX=Np  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor usR: -1{  
  // Dialog Data CQx#Xp>=s  
  //{{AFX_DATA(CCaptureDlg) >3a<#s{%  
  enum { IDD = IDD_CAPTURE_DIALOG }; (}u2) 9  
  CComboBox m_Key; ]l WEdf+  
  BOOL m_bControl; _c 4kj  
  BOOL m_bAlt; 93*MY7j}  
  BOOL m_bShift; (/r l\I  
  CString m_Path; lU[" ZFP  
  CString m_Number; $ kA'9Y  
  //}}AFX_DATA cn$o$:tW  
  // ClassWizard generated virtual function overrides RHc-kggk!  
  //{{AFX_VIRTUAL(CCaptureDlg) V94eUmx>?+  
 public: A+&^As2  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9=J+5V^qD<  
 protected: [Cx'a7KWL  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support LzW8)<N  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 0//?,'.  
  //}}AFX_VIRTUAL K*_5M  
  // Implementation m ["`Op4  
 protected: V_T.#"C4=z  
  HICON m_hIcon; n@)Kf A)&  
  // Generated message map functions zMf .  
  //{{AFX_MSG(CCaptureDlg) qQu}4Ye>  
  virtual BOOL OnInitDialog(); W h^9 Aq  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1webk;IM  
  afx_msg void OnPaint(); <n)J~B^  
  afx_msg HCURSOR OnQueryDragIcon(); Az}.Z'LJ  
  virtual void OnCancel(); 5mxYzu;#]  
  afx_msg void OnAbout(); }j/($,  
  afx_msg void OnBrowse(); #MyR:V*a  
  afx_msg void OnChange(); ,u1Yn}  
 //}}AFX_MSG ?W*{% my  
 DECLARE_MESSAGE_MAP() Nj<}t/e  
}; +M"Fv9  
#endif 2+7r Lf`l  
em+dQ15  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file N<|_tC+ct  
#include "stdafx.h" 9BJP|L%q  
#include "Capture.h" PE~umY]  
#include "CaptureDlg.h" _qq> 43  
#include <windowsx.h> CHeU?NtFps  
#pragma comment(lib,"hook.lib") Stkyz:,(  
#ifdef _DEBUG ^}+qd1r  
#define new DEBUG_NEW iz&$q]P8  
#undef THIS_FILE avmuI^LLs  
static char THIS_FILE[] = __FILE__; S4m??B  
#endif ,F,\bp}  
#define IDM_SHELL WM_USER+1 ' DZYN {}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6 K+DgNK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =r3%jWH6  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; O]\6Pv@N  
class CAboutDlg : public CDialog GESEj%R/b  
{ 6V"|  
 public: 3++}4%w  
  CAboutDlg(); R aVOZ=^-  
  // Dialog Data hmRnr=2N  
  //{{AFX_DATA(CAboutDlg) :ub 4p4h*  
  enum { IDD = IDD_ABOUTBOX }; OD*\<Sc  
  //}}AFX_DATA csceu+ IA  
  // ClassWizard generated virtual function overrides ;#F/2UgHB  
  //{{AFX_VIRTUAL(CAboutDlg) #mI{D\UR  
 protected: `K,{Y_  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8 z) K  
  //}}AFX_VIRTUAL ~$GRgOn  
  // Implementation Rr'#OxF  
 protected: b) k\?'j  
  //{{AFX_MSG(CAboutDlg) 0h[p w   
  //}}AFX_MSG Z`UwXp_s  
  DECLARE_MESSAGE_MAP() |\?mX=a.y  
}; s#%$aQ|Fp  
>tUi ;!cQ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) F3-<F_4.w  
{ u3"0K['3  
 //{{AFX_DATA_INIT(CAboutDlg) S_E-H.d"  
 //}}AFX_DATA_INIT 0Jz5i4B  
} *Kpk1  
KW* 2'C&  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) [g bYIwL.  
{ 0zQ^ 6@  
 CDialog::DoDataExchange(pDX); ne]P-50  
 //{{AFX_DATA_MAP(CAboutDlg) c>_tV3TDA  
 //}}AFX_DATA_MAP k`l={f8C  
} 9{D u)k  
 ZA u=m  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) DqfWu*  
 //{{AFX_MSG_MAP(CAboutDlg) \3M<_73  
 // No message handlers 2 L>;M  
 //}}AFX_MSG_MAP n(i Uc1Y  
END_MESSAGE_MAP() 'jw?XtG  
_JVFn=  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) }?K vT$s  
: CDialog(CCaptureDlg::IDD, pParent) g[oa'.*OB  
{ ~AVn$];{  
 //{{AFX_DATA_INIT(CCaptureDlg) MI: rH  
  m_bControl = FALSE; -/x= `S*  
  m_bAlt = FALSE; m* Zq3j  
  m_bShift = FALSE; :y/1Jf'2f  
  m_Path = _T("c:\\"); 03ol6y )C  
  m_Number = _T("0 picture captured."); #ujry. m  
  nCount=0; J`E,Xw>2  
  bRegistered=FALSE; Z~g6C0  
  bTray=FALSE; #%4XZ3j#j;  
 //}}AFX_DATA_INIT "!V-@F$@N  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 R`[jkJrc  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); F9ys.Bc  
} Frn<~  
-YDA,.Ic?  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 8 #m,TOp  
{ InO;DA\  
 CDialog::DoDataExchange(pDX); v qt#JdPp9  
 //{{AFX_DATA_MAP(CCaptureDlg) IhIz 7.|  
  DDX_Control(pDX, IDC_KEY, m_Key); Vu0d\l^$  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); zBQV2.@  
  DDX_Check(pDX, IDC_ALT, m_bAlt); wMW."gM|  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); RP@U0o  
  DDX_Text(pDX, IDC_PATH, m_Path); /C[Q?  
  DDX_Text(pDX, IDC_NUMBER, m_Number); q,i&%  
 //}}AFX_DATA_MAP C+0MzfLgf  
} KKBrw+)AJ  
B(pxyv)  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) f`$F^=  
//{{AFX_MSG_MAP(CCaptureDlg) ,4Q1[K35B  
 ON_WM_SYSCOMMAND() 3WVH8Sb  
 ON_WM_PAINT() Fy; sVB  
 ON_WM_QUERYDRAGICON() fH@P&SX  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ty"|yA  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) r}**^"mFy  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Qe[ejj1o:  
//}}AFX_MSG_MAP &RJ*DAmL  
END_MESSAGE_MAP() Fb!Ew`;QT  
i,H(6NL.  
BOOL CCaptureDlg::OnInitDialog() i/C`]1R/  
{ V< Ib#rd'  
 CDialog::OnInitDialog(); *:5S*E&}V  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); K2XRKoG  
 ASSERT(IDM_ABOUTBOX < 0xF000); `!udU,|N  
 CMenu* pSysMenu = GetSystemMenu(FALSE); @A5'vf|2;.  
 if (pSysMenu != NULL) _VUG!?_D$5  
 { ){nOM$W  
  CString strAboutMenu; ^xyU *A}D  
  strAboutMenu.LoadString(IDS_ABOUTBOX); afw`Heaa2(  
  if (!strAboutMenu.IsEmpty()) `WUyffS/!  
  { &<=?O a  
   pSysMenu->AppendMenu(MF_SEPARATOR); wit rC>  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); HBdZE7.x)3  
  } CN{xh=2qY[  
 } d-sT+4o}  
 SetIcon(m_hIcon, TRUE); // Set big icon Q$yMU [l)  
 SetIcon(m_hIcon, FALSE); // Set small icon 5%_aN_1?ef  
 m_Key.SetCurSel(0); 22T\ -g{  
 RegisterHotkey(); K8=jkU  
 CMenu* pMenu=GetSystemMenu(FALSE); Sx0/Dm  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); hCOCX_  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); i V$TvD+  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); `j1b5&N;7  
 return TRUE; // return TRUE unless you set the focus to a control  0"F|)  
} @*9c2\"k  
z/I\hC9i  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 8nu@6)#  
{ $a01">q&y  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) O#do\:(b  
 { B? aMX,1  
  CAboutDlg dlgAbout; 0H +!v  
  dlgAbout.DoModal(); Yyr qO^9m  
 } k-N}tk/5  
 else !X[P)/?b0+  
 { ,Y4>$:#n/  
  CDialog::OnSysCommand(nID, lParam); UhKd o  
 } d=p=eUd2  
} q'Nafa&a)  
E !9(6G4  
void CCaptureDlg::OnPaint() )H>?K0I  
{ Kqz+:E8D  
 if (IsIconic()) @<jm+f"MP  
 { !(F?Np Am  
  CPaintDC dc(this); // device context for painting 9Tg k=  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); l;SXR <EU  
  // Center icon in client rectangle GBl[s,g[|  
  int cxIcon = GetSystemMetrics(SM_CXICON); :jf/$]p  
  int cyIcon = GetSystemMetrics(SM_CYICON);  Zsn@O2  
  CRect rect; |ms.  
  GetClientRect(&rect); Xw#"?B(M]  
  int x = (rect.Width() - cxIcon + 1) / 2; 6lPuYEmT  
  int y = (rect.Height() - cyIcon + 1) / 2; Pav W@  
  // Draw the icon kz/"5gX:  
  dc.DrawIcon(x, y, m_hIcon); 8RI'Fk{  
 } Q!!u=}GYK  
 else %Z3B9  
 {  6oI/*`>  
  CDialog::OnPaint(); _o T+x%i  
 } ? *v*fs0  
} xi<yB0MoA  
Yr*!T= z  
HCURSOR CCaptureDlg::OnQueryDragIcon() S"t\LB*'Ls  
{ 1=h5Z3/fj  
 return (HCURSOR) m_hIcon; iR!]&Oh  
} I.'/!11>  
>WA'/Sl<A<  
void CCaptureDlg::OnCancel() y=aWSb2y'  
{ e*y l_iW  
 if(bTray) FHSFH>  
  DeleteIcon(); t2iQ[`/?~  
  CDialog::OnCancel(); lNsdbyV'  
} Qr_0 L  
Cw"[$E'J  
void CCaptureDlg::OnAbout() I)kc[/^j$  
{ =A*a9c2  
 CAboutDlg dlg; N^M6*,F,J  
 dlg.DoModal(); w~q ]&  
} H#u N&^+H  
lCgzQZ  
void CCaptureDlg::OnBrowse() yk'L_M(=  
{ N4z[=b>  
 CString str; )vUS).;S`  
 BROWSEINFO bi; VJP#  
 char name[MAX_PATH]; JeN]sK)8x  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); % H<@Y$r  
 bi.hwndOwner=GetSafeHwnd(); A0Q`Aqs  
 bi.pszDisplayName=name; DK?Z   
 bi.lpszTitle="Select folder";  .^2.h  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ZXN`8!]&  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); `-e9#diQe  
 if(idl==NULL) ^s#+`Y05/  
  return; BNF*1JO  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 6oq5CDoq  
 str.ReleaseBuffer(); gj iFpW4  
 m_Path=str; ACy}w?D<  
 if(str.GetAt(str.GetLength()-1)!='\\') NJSbS<O  
  m_Path+="\\"; g!.piG|  
 UpdateData(FALSE); C>'G?  
} +p`BoF9~  
q{_f"  
void CCaptureDlg::SaveBmp() C4qK52'2s  
{ spTz}p^\O  
 CDC dc; +'Y?K]zbt  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 5JEOLPS  
 CBitmap bm; 5rfDm  
 int Width=GetSystemMetrics(SM_CXSCREEN); J[05T1  
 int Height=GetSystemMetrics(SM_CYSCREEN); Rc3!u^?u  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 4x}U+1B  
 CDC tdc; cIQbu#[@  
 tdc.CreateCompatibleDC(&dc); T*gG <8  
 CBitmap*pOld=tdc.SelectObject(&bm); (7N!Jvg9  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); i=*H|)  
 tdc.SelectObject(pOld); >tPf.xI|l  
 BITMAP btm; "]uPke@  
 bm.GetBitmap(&btm); .vctuy&  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; >kxRsiKV  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); U?d  I  
 BITMAPINFOHEADER bih; _VRxI4q  
 bih.biBitCount=btm.bmBitsPixel; *N4/M%1P  
 bih.biClrImportant=0; UmvnVmnv  
 bih.biClrUsed=0; J<0d"'  
 bih.biCompression=0; )HC/J-  
 bih.biHeight=btm.bmHeight; ll1N`ke  
 bih.biPlanes=1; b !y  
 bih.biSize=sizeof(BITMAPINFOHEADER); z5oJQPPi  
 bih.biSizeImage=size; \NMqlxp2  
 bih.biWidth=btm.bmWidth; 0%< hj  
 bih.biXPelsPerMeter=0; t)Cf]]dV  
 bih.biYPelsPerMeter=0; t#@z_Mn\  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); m?4hEwQxf  
 static int filecount=0; @"BhKUoV$K  
 CString name; X.S<",a{qz  
 name.Format("pict%04d.bmp",filecount++); LGW:+c  
 name=m_Path+name; fI`gF^u(  
 BITMAPFILEHEADER bfh; |pv$],&&:  
 bfh.bfReserved1=bfh.bfReserved2=0; 71%$&6  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ;/_htdj  
 bfh.bfSize=54+size; Y#Q!mbp  
 bfh.bfOffBits=54; [OTn>/W'  
 CFile bf; I*^t!+q$  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ [*5]NNB  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 8B &EH+  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); (&Jo. <  
  bf.WriteHuge(lpData,size); }eW<P079  
  bf.Close(); mv#hy  
  nCount++; $OdBuJA  
 } 9unRMvE u  
 GlobalFreePtr(lpData); {|hg3R~A  
 if(nCount==1) ~##FW|N)  
  m_Number.Format("%d picture captured.",nCount); h@NC#Iod  
 else SepwMB4@  
  m_Number.Format("%d pictures captured.",nCount); bEj}J_#  
  UpdateData(FALSE); \?R#ZxP@  
} EnlAgL']|  
:H3/+/x  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Q.$Rhjb  
{ q`/J2r+O  
 if(pMsg -> message == WM_KEYDOWN) W>i%sHH6  
 { zG<<MR/<  
  if(pMsg -> wParam == VK_ESCAPE) tuIZYp8tIN  
   return TRUE; ,pI9=e@O/z  
  if(pMsg -> wParam == VK_RETURN) ohq Thl  
   return TRUE; /+J nEFf  
 } Li} 5aK  
 return CDialog::PreTranslateMessage(pMsg); hHmm(~5gR  
} d,^ZH  
RZV6;=/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *E/ Mf  
{ ~WTkX(\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 8ta @@h  
  SaveBmp(); C0/^6Lu"o  
  return FALSE; /q\e&&e  
} ~a[ /l  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ bA,Zfsr6#  
 CMenu pop; mi<Q3;m  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); X*@ tp,t  
 CMenu*pMenu=pop.GetSubMenu(0); `j@1]%&z  
 pMenu->SetDefaultItem(ID_EXITICON); 6 h#U,G  
 CPoint pt; po*8WSl9c[  
 GetCursorPos(&pt); t4#gW$+^?H  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); r!dWI  
 if(id==ID_EXITICON) .!KsF h,pK  
  DeleteIcon();  {Ba&  
 else if(id==ID_EXIT) y)&K9 I  
  OnCancel(); X.;VZwT+  
 return FALSE; vE'{?C=EM  
} M Zz21H  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); YIg43Av  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) z8ZQL.z%h  
 AddIcon(); PBb&.<   
 return res; 9/29>K_  
} vio>P-2Eho  
f\dfKNm6  
void CCaptureDlg::AddIcon() v.Q#<@B^:  
{ v;e8W9M  
 NOTIFYICONDATA data; Jg[Ao#,==  
 data.cbSize=sizeof(NOTIFYICONDATA); g?v(>#i  
 CString tip; >":xnX#  
 tip.LoadString(IDS_ICONTIP); X2Z)> 10  
 data.hIcon=GetIcon(0); CUI+@|]%  
 data.hWnd=GetSafeHwnd(); NT*r7_e  
 strcpy(data.szTip,tip); |K Rt$t  
 data.uCallbackMessage=IDM_SHELL; Kus=.(  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; $\h-F8|JMX  
 data.uID=98; ap}p?r  
 Shell_NotifyIcon(NIM_ADD,&data); nS%jnp#  
 ShowWindow(SW_HIDE); 2L1 ,;  
 bTray=TRUE; c#}K,joeU  
} Ql)hIf$Oo  
i m;6$3  
void CCaptureDlg::DeleteIcon() B??07j  
{ j8&NscK)  
 NOTIFYICONDATA data; $N)G:=M!s  
 data.cbSize=sizeof(NOTIFYICONDATA); zVw5(Tc  
 data.hWnd=GetSafeHwnd(); \OVtvJV]  
 data.uID=98; *C5`LgeX  
 Shell_NotifyIcon(NIM_DELETE,&data); IB[$~sGe  
 ShowWindow(SW_SHOW); Pn">fWRCx  
 SetForegroundWindow(); 0dC5 -/+  
 ShowWindow(SW_SHOWNORMAL); ZAgXz{!H(  
 bTray=FALSE; Blzvn19'h  
} I61S0l z/  
vlbZ5  
void CCaptureDlg::OnChange() h:362&?]  
{ xz"60xxY  
 RegisterHotkey(); `2s@O>RV  
} ~h@@y5<4  
0W*{ 1W  
BOOL CCaptureDlg::RegisterHotkey() L/tn;0  
{ P{n#^4  
 UpdateData(); hvw9i7#  
 UCHAR mask=0; OY`B{jV-  
 UCHAR key=0; KN|<yF   
 if(m_bControl) }<A.zwB<i  
  mask|=4; )Wk_|zO-  
 if(m_bAlt) zg<-%r'$  
  mask|=2; =9a2+v0  
 if(m_bShift) ^_bG{du  
  mask|=1; `sCaGCp  
  key=Key_Table[m_Key.GetCurSel()]; ,-y9P  
 if(bRegistered){ XJ4f;U  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); NVv <vu  
  bRegistered=FALSE; YK3>M"58  
 } w I_@  
 cMask=mask; _K~h? \u  
 cKey=key; lWId 0eNS  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); eA4:]A"  
 return bRegistered; +Ua|0>?  
} F$?Ab\#B  
;yt6Yp.6e  
  四、小结 ?N<My& E  
;9T}h2^`B  
  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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