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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: /`+7_=-  
  dVGbe07  
  一、实现方法 #nEL~&  
\A(5;ZnuD  
  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: #x~_`>mDN  
 _^T}_  
#pragma data_seg("shareddata") -e*BqH2t  
HHOOK hHook =NULL; //钩子句柄 }ND'0*#  
UINT nHookCount =0; //挂接的程序数目 ")M;+<c"l  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 LK+felL  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 _A-V@%3  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 6%?A>  
static int KeyCount =0; {tt$w>X  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 h5-d;RKE  
#pragma data_seg() \cZfg%PN  
p\S8oHWe  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 `C'}e  
ct0v$ct>f  
  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: }1m_o@{3P  
7a<_BJXx  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR xNgt[fLpS  
cKey,UCHAR cMask) c{>|o  
{ (6k>FSpg  
 BOOL bAdded=FALSE; \_ -DyD#3  
 for(int index=0;index<MAX_KEY;index++){ F]5\YYXO  
  if(hCallWnd[index]==0){ O5;-Om  
   hCallWnd[index]=hWnd; Jz$ >k$!UD  
   HotKey[index]=cKey; Yu3_=: <C  
   HotKeyMask[index]=cMask; k/#>S*Ne  
   bAdded=TRUE; 3h&bZ  
   KeyCount++; jG8;]XP  
   break; !6E:5=L^  
  } }W}G X(?P  
 } UC|JAZL  
 return bAdded; fn1pa@P  
} O71BM@2<  
//删除热键 s.y}U5Ty?P  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hW%p#g;  
{ \!wh[qEQ\  
 BOOL bRemoved=FALSE; z%};X$V`J  
 for(int index=0;index<MAX_KEY;index++){ vlQ0gsXK  
  if(hCallWnd[index]==hWnd){ x,1=D~L}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ A&l7d0Z^j5  
    hCallWnd[index]=NULL; RVP18ub.S  
    HotKey[index]=0; 1+^n!$  
    HotKeyMask[index]=0; xG%*PNM0q  
    bRemoved=TRUE; F+*Q <a4  
    KeyCount--; k4R4YI"jV  
    break; 1Z:R,\+L  
   } ,}<RrUfD  
  } q6&67u0  
 } -eL'KO5'  
 return bRemoved; uF<S  
} };p~A-E=  
$ !5f"<FCB  
K:w]> a  
  DLL中的钩子函数如下: a: IwA9!L  
UUm |@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) XU-*[\K  
{ {!t=n   
 BOOL bProcessed=FALSE; g7Z9F[d  
 if(HC_ACTION==nCode) DMMLzS0A  
 { PP-kz;|  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 hbnS~sva  
   switch(wParam) >zR14VO`_|  
   {  BWEv1' v  
    case VK_MENU: sVoR?peQ  
     MaskBits&=~ALTBIT; : ;TYL[  
     break; (nz}J)T&  
    case VK_CONTROL: Omb.53+  
     MaskBits&=~CTRLBIT; JUU&Z[6J  
     break; ohplj`X[21  
    case VK_SHIFT: z8tl0gd%D  
     MaskBits&=~SHIFTBIT; 7TdQRB  
     break; 6 [ _ fD  
    default: //judge the key and send message 4:3_ER]J  
     break; dXO=ZU/N  
   } KpGUq0d@  
   for(int index=0;index<MAX_KEY;index++){ ue9h   
    if(hCallWnd[index]==NULL) u _X} -U  
     continue; UoRDeYQ`E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @+t (xCv  
    { i;]CL[#2e`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ai^t= s  
     bProcessed=TRUE; y.ql#eQ,  
    } /.v_N%*-v  
   } $rTu6(i1  
  } h--45`cE  
  else if((lParam&0xc000ffff)==1){ //有键按下 l/F!Bq[*g  
   switch(wParam) -lnevrl   
   { +"Ub/[J{G1  
    case VK_MENU: LYNZP4(R  
     MaskBits|=ALTBIT; @<5Tba>SC  
     break; {? 2;0}3?;  
    case VK_CONTROL: d<v~=  
     MaskBits|=CTRLBIT; sMX$Q45e  
     break; x~Cz?ljbn  
    case VK_SHIFT: Um'Ro4  
     MaskBits|=SHIFTBIT; 3W'FcE)|E  
     break; o}W;Co  
    default: //judge the key and send message 4Pf+]R  
     break; "ZqEP R)  
   } raF] k0{  
   for(int index=0;index<MAX_KEY;index++){ @Wz%KdXA  
    if(hCallWnd[index]==NULL) m0C{SBn-M  
     continue; 0@v 2*\D#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UAKu_RO6S  
    { D&f!( n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %r P !  
     bProcessed=TRUE; S ;h&5.p  
    } F-tFet  
   } dm  2EH  
  } N-Z^G<[q.  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ,\}k~ U99  
   for(int index=0;index<MAX_KEY;index++){ % GVN4y&  
    if(hCallWnd[index]==NULL) ) H+d.Y  
     continue; ETg{yBsp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _j>L4bT  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); h[,XemwX  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ]*GnmG:D*  
   } GjLW`>  
  } <b'1#Pd>0  
 } :ovt?q8">  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {RJ52Gx(  
} }v&K~!*  
T,Fm"U6[(  
  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: `OBl:e  
g+3Hwtl  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W W35&mI)k  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); F#KF6)P  
}Q ;BQ2[  
  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: G}q<{<+$  
q55M8B 4w  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) yH+c#w  
{ }EP|Mb  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) I<KCt2:X  
 { IE}Sdeqi)  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 P]- #wz=S  
  SaveBmp(); ~Q0&P!k  
  return FALSE; V4Qz*z%  
 } -zR.'x%  
 …… //其它处理及默认处理 g kn)V~ij  
} >-eS&rma  
S NN#$8\  
}9 ?y'6l  
  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。 ]An_5J  
xjE7DCmA  
  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。 ] .`_, IO  
k3#wLJ  
  二、编程步骤 5DUi4 Cbgy  
qNy-o\;XN  
  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"; `}Eh[EOHJ  
lj Y  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Z"]xdOre  
$q^O%(  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; !;jgzi?z  
5Vm Eyb  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 4NJVW+:2  
:Nkz,R?  
  5、 添加代码,编译运行程序。 &D^e<j}RQ  
8a?IC|~Pz  
三、程序代码 +~:x}QwGT  
n}f3Vrl  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL j+ I*Xw  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) =^#0.  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ N7a[B>+`  
#if _MSC_VER > 1000 51z/  
#pragma once Y1|^>C#a  
#endif // _MSC_VER > 1000 i"vDRrDe  
#ifndef __AFXWIN_H__ ig+k[`W  
#error include 'stdafx.h' before including this file for PCH 2G H)iUmc  
#endif :)j7U3u  
#include "resource.h" // main symbols JOPTc]  
class CHookApp : public CWinApp !#C)99L"F  
{ o16d`}/<  
 public: yX`J7O{=  
  CHookApp(); eXc[3ceUr  
  // Overrides 4I z.fAw  
  // ClassWizard generated virtual function overrides f^~2^p 1te  
  //{{AFX_VIRTUAL(CHookApp) M.X}K7Z_/  
 public: MV9r5|3-  
  virtual BOOL InitInstance(); Kjv2J;Xuh  
  virtual int ExitInstance(); ` 4OMZMq  
  //}}AFX_VIRTUAL p0   
  //{{AFX_MSG(CHookApp) V@Ax}<$A  
  // NOTE - the ClassWizard will add and remove member functions here. @kS|Jz$iY  
  // DO NOT EDIT what you see in these blocks of generated code ! Z`|>tbOfZ  
  //}}AFX_MSG 2UQN*_  
  DECLARE_MESSAGE_MAP() ,=yOek}  
}; O0-> sR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); "--/v. Cs  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5VuC U  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); B5 D3_ iX]  
BOOL InitHotkey(); 9#Z zE/  
BOOL UnInit(); \ =S3 L<  
#endif IcRM4Ib))Q  
87R%ke  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. cl ?< 7  
#include "stdafx.h" =7#u+*Yr9  
#include "hook.h" W31LNysH!;  
#include <windowsx.h>  B$@1QG  
#ifdef _DEBUG .vN)A *  
#define new DEBUG_NEW /nwxuy  
#undef THIS_FILE uwmoM>I W^  
static char THIS_FILE[] = __FILE__; D\@e{.$MZ|  
#endif $# D n4  
#define MAX_KEY 100 cn@03&dAl  
#define CTRLBIT 0x04 bOi};/f  
#define ALTBIT 0x02  |h  
#define SHIFTBIT 0x01 ',:3>{9  
#pragma data_seg("shareddata") XC :;Rq'j  
HHOOK hHook =NULL; d~w}NK[(  
UINT nHookCount =0; KsZ@kTs  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey NJ.rv  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT }klE0<W|5\  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey N`J:^,H  
static int KeyCount =0; L00Sp#$\  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Q S5dP  
#pragma data_seg() P)a("XnJ`  
HINSTANCE hins; fLLnf].O  
void VerifyWindow(); E {I)LdAqK  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) D1oaG0  
//{{AFX_MSG_MAP(CHookApp) od;Bb  
// NOTE - the ClassWizard will add and remove mapping macros here. d&O'r[S  
// DO NOT EDIT what you see in these blocks of generated code! #( $k 3OA  
//}}AFX_MSG_MAP ?T tQZ  
END_MESSAGE_MAP() dl7Riw-J  
pK-_R#  
CHookApp::CHookApp() wgC??Be;ut  
{ oH!$eAU?  
 // TODO: add construction code here, `i"$*4#<  
 // Place all significant initialization in InitInstance @$2`DI{_^  
} =ZxW8 DK  
Tnzco  
CHookApp theApp; z4 GN8:~x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,R7=]~<io"  
{ 4he v ;  
 BOOL bProcessed=FALSE; Z&AHM &,yj  
 if(HC_ACTION==nCode) r)) $XM  
 { 6-)7:9y  
  if((lParam&0xc0000000)==0xc0000000){// Key up AsTMY02|  
   switch(wParam) Fr1;)WV  
   { md1EJ1\14  
    case VK_MENU: nF|#@O`1  
     MaskBits&=~ALTBIT; \] tq7  
     break; ykErt%k<n  
    case VK_CONTROL: E geG,/-`  
     MaskBits&=~CTRLBIT; 23(B43zy  
     break; 0IoXDx  
    case VK_SHIFT: G1`mn$`kq  
     MaskBits&=~SHIFTBIT; w`H.ey  
     break; 'w>uFg1.  
    default: //judge the key and send message DLwC5Iir  
     break; <~IH`  
   } u5  [1Z|O  
   for(int index=0;index<MAX_KEY;index++){ ?^+#pcX]t|  
    if(hCallWnd[index]==NULL) /\IAr,w[  
     continue; x!Z:K5%O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X ,V= od>  
    { GC5#1+fQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); U89]?^|bb  
     bProcessed=TRUE; L%c]%3A  
    } 8:3oH!n  
   } 9,Crmbw8  
  } @lb=-oR!~  
  else if((lParam&0xc000ffff)==1){ //Key down "1gk-  
   switch(wParam) 2?#y |/  
   { y9l#;<b  
    case VK_MENU:  [%gK^Zt  
     MaskBits|=ALTBIT; 3B!&ow<rt  
     break; N}.Q%&6:  
    case VK_CONTROL: sRo<4U0M;l  
     MaskBits|=CTRLBIT; )A>U<n$h  
     break; 2n-Tpay0  
    case VK_SHIFT: ,H#qgnp  
     MaskBits|=SHIFTBIT; *:fw6mnJ#  
     break; oo$WD6eCR  
    default: //judge the key and send message ihpz}g  
     break; N \CEocU  
   } 1j${,>4tQ  
   for(int index=0;index<MAX_KEY;index++) O+{pF.P#V  
   { o{S}e!Vb  
    if(hCallWnd[index]==NULL) j. ks UJ  
     continue; ims=-1,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Egjk^:@  
    { iOX4Kl  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 886 ('  
     bProcessed=TRUE; thlpj*|  
    } teQaHe#  
   } ~P"!DaAf  
  } B BApL{  
  if(!bProcessed){ cpr{b8Xb8&  
   for(int index=0;index<MAX_KEY;index++){ Cn6n4, 0  
    if(hCallWnd[index]==NULL) rw=UK`  
     continue; 6N)< o ;U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) aPY>fy^8D  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~u~[E  
   } M2zos(8g  
  } "c! oOaA  
 } kMJQeo79  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (> +k3  
} 5tgILxSK  
(DEL xE  
BOOL InitHotkey() 4$q )e<-  
{ _x,-d|9b d  
 if(hHook!=NULL){ ' 5OVs:)"^  
  nHookCount++; lD;,I^Lt6  
  return TRUE; \Z6gXO_  
 } !S > |Qh  
 else ziB]S@U  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); xsY>{/C  
  if(hHook!=NULL) dEAAm=K,<  
   nHookCount++; =Nv= Q mO  
  return (hHook!=NULL); +,{Wcb  
} 98b9%Z'2f  
BOOL UnInit() Z+`{JE#  
{ ZB_16&2Ow  
 if(nHookCount>1){ **w*hd]  
  nHookCount--; gn[$;*932z  
  return TRUE;  n_xa)  
 } SG+i\yu$h0  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 2=!3[> B  
 if(unhooked==TRUE){ \/x)BE,  
  nHookCount=0; 6ljRV)  
  hHook=NULL; *k@0:a(>  
 } 0]2B-o"kI  
 return unhooked; LBbo.KxAe3  
} $@:>7Y"  
]` &[Se d  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) D"( 3VIglq  
{ ai;gca_P#  
 BOOL bAdded=FALSE; Vx7Dl{?{'  
 for(int index=0;index<MAX_KEY;index++){ {Y@-*pL]  
  if(hCallWnd[index]==0){ hI>rtaY_  
   hCallWnd[index]=hWnd; B;D:9K  
   HotKey[index]=cKey; . ;ea]_Z  
   HotKeyMask[index]=cMask; nX.sh  
   bAdded=TRUE; faL^=CAe  
   KeyCount++; MLv.v&@S  
   break; Y+"hu2aPkY  
  } [ilv/V<  
 } &"H<+>`  
 return bAdded; x9o^9QJh  
} xJH9qc ME  
-Y jv&5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0@mX4.!  
{ 8)q]^  
 BOOL bRemoved=FALSE; yZ(Nv $[5  
 for(int index=0;index<MAX_KEY;index++){ yK>0[6l  
  if(hCallWnd[index]==hWnd){ i6g[E 4nk  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3Ld ;zW  
    hCallWnd[index]=NULL; +{Vwz  
    HotKey[index]=0; sKB-7  
    HotKeyMask[index]=0; amk42  
    bRemoved=TRUE; ubN"(F:!-S  
    KeyCount--; SU#P.y18%  
    break; < jocfTBk  
   } .^`a6>EQ)|  
  } ,d [b"]Zy  
 } `6S=KRv  
 return bRemoved; sh)) [V"8  
} W1vAK  
XpAq=p0;  
void VerifyWindow() e=F( Zf+1^  
{ \,cKt_{ u  
 for(int i=0;i<MAX_KEY;i++){ j@?[vi  
  if(hCallWnd!=NULL){ M@2Qn-I  
   if(!IsWindow(hCallWnd)){ RzY`^A6G6  
    hCallWnd=NULL; NV:XPw/  
    HotKey=0;  eS@!\H x  
    HotKeyMask=0; '*LN)E> d  
    KeyCount--; 7s fuju(  
   } 9bcyPN  
  } E[Ws} n.  
 } ga1gd~a  
} M?4r5R  
j+B5m:ExfI  
BOOL CHookApp::InitInstance() bmq XP  
{ 5t5S{aCDr  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); v`ZusHJ1d  
 hins=AfxGetInstanceHandle(); uI-7 6  
 InitHotkey(); @01D1A  
 return CWinApp::InitInstance(); m)]fJ_  
} Mb 2 L32  
) }it,<  
int CHookApp::ExitInstance() <QoE_z`76  
{ 7%"\DLA  
 VerifyWindow(); &_^*rD~  
 UnInit(); @Jn:!8U0  
 return CWinApp::ExitInstance(); w KMk|y>  
} y[5P<:&s  
Ccd7|L1  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file vyx\N{  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Lv5 ==w}  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ; # ?0#):-  
#if _MSC_VER > 1000 ESf7b `tS  
#pragma once qpwh #^2  
#endif // _MSC_VER > 1000 g(Xg%&@KZ  
at(p,+ %  
class CCaptureDlg : public CDialog )!*M 71  
{ Q3O .<9S  
 // Construction W0T i ^@  
 public: )w 8lusa  
  BOOL bTray; ,vdP #:  
  BOOL bRegistered; s$\8)V52  
  BOOL RegisterHotkey(); B[_bJ *  
  UCHAR cKey; (yTz^o$t|  
  UCHAR cMask; c+i`Zd.m<  
  void DeleteIcon(); cxJK>%84  
  void AddIcon(); I/b8  
  UINT nCount; $\@ V4  
  void SaveBmp(); +=H>s;B  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor tD0>(41K  
  // Dialog Data [dF=1E>W_J  
  //{{AFX_DATA(CCaptureDlg) #IrP"j^  
  enum { IDD = IDD_CAPTURE_DIALOG }; lnC Wu@{  
  CComboBox m_Key; |tJ%:`DGw  
  BOOL m_bControl; O2/w:zOg'  
  BOOL m_bAlt; aE cg_es  
  BOOL m_bShift; g*c\'~f;  
  CString m_Path; i7FR78^  
  CString m_Number; ._8cJf.ae  
  //}}AFX_DATA = SJF \Z  
  // ClassWizard generated virtual function overrides Di"9 M(6vf  
  //{{AFX_VIRTUAL(CCaptureDlg) +2fJ  
 public: @[kM1:G-F{  
  virtual BOOL PreTranslateMessage(MSG* pMsg); NlEWm8u   
 protected: _5S$mc8K0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support m^x\@!N:(  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); q.b4m 'J  
  //}}AFX_VIRTUAL PXu<4VF  
  // Implementation g!Yh=kA'N  
 protected: pfQZ|*>lkb  
  HICON m_hIcon; Hi" n GH  
  // Generated message map functions l}-`E@w  
  //{{AFX_MSG(CCaptureDlg) /Vd#q)b%T  
  virtual BOOL OnInitDialog(); 1Da [!^u,D  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); iE gM ~  
  afx_msg void OnPaint(); -+_aL4.  
  afx_msg HCURSOR OnQueryDragIcon(); -Fc#  
  virtual void OnCancel(); Z#:@M[HH{  
  afx_msg void OnAbout(); m'"VuH?^  
  afx_msg void OnBrowse(); p'!,F; xX  
  afx_msg void OnChange(); s]8J+8 <uO  
 //}}AFX_MSG @>nk^ l  
 DECLARE_MESSAGE_MAP() M-K@n$k   
}; KdMA58)  
#endif cBF%])!  
@#Uiy5N  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file I_I;.Ik  
#include "stdafx.h" {ro!OuA  
#include "Capture.h" |{IU<o x  
#include "CaptureDlg.h" u2O^3r G-  
#include <windowsx.h> `b`52b\6S  
#pragma comment(lib,"hook.lib") c%/&@vs7  
#ifdef _DEBUG UVmyOC[Y{  
#define new DEBUG_NEW & O\!!1%  
#undef THIS_FILE 0@x$Cp  
static char THIS_FILE[] = __FILE__; B:#0B[  
#endif 2|>wY%  
#define IDM_SHELL WM_USER+1 yx;R#8;b.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @%G"i:HZ&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]JPPL4wAT  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; \lIHC{V\  
class CAboutDlg : public CDialog UXB8sS*wQ?  
{ "_@+/Iy.  
 public: _"bvT?|  
  CAboutDlg(); $<% nt  
  // Dialog Data /D]r "-  
  //{{AFX_DATA(CAboutDlg) :9q^  
  enum { IDD = IDD_ABOUTBOX }; UMW^0>Z!v  
  //}}AFX_DATA $hp?5K M  
  // ClassWizard generated virtual function overrides OSi9J.]O  
  //{{AFX_VIRTUAL(CAboutDlg) ]%8;c  
 protected: ;U3Vows  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support d]~1.i  
  //}}AFX_VIRTUAL $<e .]`R  
  // Implementation %vYlu%c<  
 protected: tUF]f6  
  //{{AFX_MSG(CAboutDlg) Zw 8b -_  
  //}}AFX_MSG bK%tQeT  
  DECLARE_MESSAGE_MAP() KBHKcFk  
}; t\d;}@bl  
M]TVaN$v#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) c O>:n  
{ uOqDJM'RM  
 //{{AFX_DATA_INIT(CAboutDlg) vS__*} ^  
 //}}AFX_DATA_INIT |F {E4mg(o  
} rPvX8*) tV  
}M@Jrq+7  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) HwMsP$`q  
{ }4]x"DfIg  
 CDialog::DoDataExchange(pDX); 'wV26Dm  
 //{{AFX_DATA_MAP(CAboutDlg) V="f)'S$  
 //}}AFX_DATA_MAP :!15>ML;-  
} QO1Gq9  
 pytfsVM  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) TFNU+  
 //{{AFX_MSG_MAP(CAboutDlg) '^3pF2lIw  
 // No message handlers q ? TI,  
 //}}AFX_MSG_MAP M|=$~@9#X  
END_MESSAGE_MAP() Nh/ArugP5P  
.T w F] v  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) vbh#[,lh  
: CDialog(CCaptureDlg::IDD, pParent) TEZqAR]G  
{ NfN6KDd]2L  
 //{{AFX_DATA_INIT(CCaptureDlg) i j;'4GzQL  
  m_bControl = FALSE; z( [$,e\  
  m_bAlt = FALSE; l 8us6  
  m_bShift = FALSE; S%#Mu|  
  m_Path = _T("c:\\"); h,?Yw+#o"  
  m_Number = _T("0 picture captured."); ;QD;5 <1  
  nCount=0; sn`?Foh  
  bRegistered=FALSE; K :ptfD  
  bTray=FALSE; Bin&:%|9?  
 //}}AFX_DATA_INIT >.~k?_Of  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 5{aQ4H>~tx  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); R:x04!}  
} c}s3c >`d  
|sM#g1D@  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ;K-t  
{ :S6 <v0`Z  
 CDialog::DoDataExchange(pDX); vJ}  
 //{{AFX_DATA_MAP(CCaptureDlg) vz5 RS  
  DDX_Control(pDX, IDC_KEY, m_Key); Cms"OkN  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 8^i,M^f^{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); S9055`v5  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 5j5t?G;d,  
  DDX_Text(pDX, IDC_PATH, m_Path); ^q r[?ky]&  
  DDX_Text(pDX, IDC_NUMBER, m_Number); tO3B_zC  
 //}}AFX_DATA_MAP "z4E|s  
} yE{UV>ry  
UpBYL?+L  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) RVy87_J1  
//{{AFX_MSG_MAP(CCaptureDlg) >&Lu0oHH  
 ON_WM_SYSCOMMAND() iPNs EQ0We  
 ON_WM_PAINT() k rjd:*E  
 ON_WM_QUERYDRAGICON() baGI(Dk  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) k-0e#"B  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) o!0a8i  
 ON_BN_CLICKED(ID_CHANGE, OnChange) NH6!|T  
//}}AFX_MSG_MAP czi!q1<vg  
END_MESSAGE_MAP() <)rH8]V  
g&5VorGx  
BOOL CCaptureDlg::OnInitDialog() 0k]N%!U  
{ sRI8znus  
 CDialog::OnInitDialog(); `P*j~ZLlXN  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); /^ 7 9|$E  
 ASSERT(IDM_ABOUTBOX < 0xF000); kIo?<=F8T  
 CMenu* pSysMenu = GetSystemMenu(FALSE); e$I:[>  
 if (pSysMenu != NULL) -q|M=6gOs  
 { c3-bn #  
  CString strAboutMenu; HXo'^^}q;  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 5|z[%x~f  
  if (!strAboutMenu.IsEmpty()) $7g(-W  
  { ^@eCT}p{  
   pSysMenu->AppendMenu(MF_SEPARATOR); zxHfQ(  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Y :BrAa[  
  } 24l9/v'  
 } K*RRbtb  
 SetIcon(m_hIcon, TRUE); // Set big icon FQ^uX]<3j  
 SetIcon(m_hIcon, FALSE); // Set small icon ^S$w,  
 m_Key.SetCurSel(0); 5OE?;PJ(  
 RegisterHotkey(); ?q`mr_x%?  
 CMenu* pMenu=GetSystemMenu(FALSE); r${a S@F  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ^r$5];n  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); $yJfAR  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ga%77t|jm3  
 return TRUE; // return TRUE unless you set the focus to a control Q"uu&JC  
} wu'60po  
izA3INT  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) {+}Lc$O#C  
{ IA^DfdZY  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) I !~Omr@P  
 { 6h8NrjX  
  CAboutDlg dlgAbout; a)b@en;v  
  dlgAbout.DoModal(); mAKi%)  
 } A(5? ci  
 else > xw+2<  
 { vi|ASA{V  
  CDialog::OnSysCommand(nID, lParam); U {v_0\ES  
 } Gu=bPQOj  
} ,oe4*b}O=.  
L}nc'smvM  
void CCaptureDlg::OnPaint() '(*D3ysU  
{ >48Y-w  
 if (IsIconic()) ><^@1z.J  
 { 4 -W?u51"  
  CPaintDC dc(this); // device context for painting vkLG<Y  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); UzXbaQQ2g  
  // Center icon in client rectangle >dY"B$A>  
  int cxIcon = GetSystemMetrics(SM_CXICON); y0^FTSQ|  
  int cyIcon = GetSystemMetrics(SM_CYICON); #UIg<:  
  CRect rect; HN%ZN}  
  GetClientRect(&rect); k5M(Ve  
  int x = (rect.Width() - cxIcon + 1) / 2; "m5ZZG#R`  
  int y = (rect.Height() - cyIcon + 1) / 2; v-qS 'N 4  
  // Draw the icon dRmTE  
  dc.DrawIcon(x, y, m_hIcon); *z~Y*Q0  
 } p6*D^-  
 else l71\II  
 { >[U$n.  
  CDialog::OnPaint();  t&]IgF  
 } ~ME=!;<_  
} NeP1 #  
T@.CwV  
HCURSOR CCaptureDlg::OnQueryDragIcon() u@Lu.t!],  
{ @hv] [(<  
 return (HCURSOR) m_hIcon; X:5*LB\/v  
} f5v|}gMAX  
*']RYu?X  
void CCaptureDlg::OnCancel() @ck2j3J/  
{ C+j+q648>  
 if(bTray) LV0{~g(!%  
  DeleteIcon(); *lSIT]1  
  CDialog::OnCancel(); <j' #mUzd  
} `P~RG.HO  
(;3jmdJhK  
void CCaptureDlg::OnAbout() 1GxYuTZ{  
{ b04~z&Xv  
 CAboutDlg dlg; &0`L;1R  
 dlg.DoModal(); q ^?{6}sy  
} R<)uvW_@  
+Xk!)Ge5E*  
void CCaptureDlg::OnBrowse() n:+M Nr  
{ _ev^5`>p/  
 CString str; I/l]Yv!  
 BROWSEINFO bi; Z8W<RiR  
 char name[MAX_PATH]; )_ uK(UNZ5  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ~jaGf  
 bi.hwndOwner=GetSafeHwnd(); y;H 3g#  
 bi.pszDisplayName=name; d8>D=Ve  
 bi.lpszTitle="Select folder"; [+GG Wo  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; &!=3Fbn  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); sAxn ; `  
 if(idl==NULL) n3w2&  
  return; ;L7<mU  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); =}[V69a  
 str.ReleaseBuffer(); A`KTm(  
 m_Path=str; y? g7sLDc  
 if(str.GetAt(str.GetLength()-1)!='\\') E^!%m8--  
  m_Path+="\\"; mAMKCxz,  
 UpdateData(FALSE); qJ !xhf1  
} T&%>/7I>  
&'R]oeag  
void CCaptureDlg::SaveBmp() K67x.PZ  
{ Onl:eG;@  
 CDC dc; LYKepk  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); sf LBi~*j  
 CBitmap bm; 8c#*T%Vf  
 int Width=GetSystemMetrics(SM_CXSCREEN);  2r[,w]  
 int Height=GetSystemMetrics(SM_CYSCREEN); UkUdpZ.[il  
 bm.CreateCompatibleBitmap(&dc,Width,Height); C`ok{SNtUy  
 CDC tdc; Hd:ZE::Q'#  
 tdc.CreateCompatibleDC(&dc); "6ZatRUd  
 CBitmap*pOld=tdc.SelectObject(&bm); .d2s4q\  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); cg4,PI% hz  
 tdc.SelectObject(pOld); A-<qr6q  
 BITMAP btm; R~b$7jpd  
 bm.GetBitmap(&btm); :V [vE h  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; #q-t!C%E  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); [|3 %~s|Sv  
 BITMAPINFOHEADER bih; v1: 5 r  
 bih.biBitCount=btm.bmBitsPixel; I;7VX5X  
 bih.biClrImportant=0; h*Ej}_  
 bih.biClrUsed=0; B:l(`G  
 bih.biCompression=0; @"6BvGU2s  
 bih.biHeight=btm.bmHeight; z')'8155  
 bih.biPlanes=1; pq@ad\8  
 bih.biSize=sizeof(BITMAPINFOHEADER); opBv x>S  
 bih.biSizeImage=size; Gr_I/+<  
 bih.biWidth=btm.bmWidth; qdOS=7]W  
 bih.biXPelsPerMeter=0; W[YtNL;  
 bih.biYPelsPerMeter=0; czj[U|eB}=  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 4):\,>%pK  
 static int filecount=0; Uc&0>_Z  
 CString name; 49CMRO,T  
 name.Format("pict%04d.bmp",filecount++); sx9 N8T3n  
 name=m_Path+name; jN[Z mJz'  
 BITMAPFILEHEADER bfh; nQ mkDPjU  
 bfh.bfReserved1=bfh.bfReserved2=0; kn! J`"b  
 bfh.bfType=((WORD)('M'<< 8)|'B'); T+\BX$w/4e  
 bfh.bfSize=54+size; PW}Yts7p  
 bfh.bfOffBits=54; g\ke,r6  
 CFile bf; ]fR 3f  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ V!oyC$eV  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ' =oV  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); QF>H>=Za=  
  bf.WriteHuge(lpData,size); P<bA~%<7"[  
  bf.Close(); l|DOsI'r  
  nCount++; HLS^Ga,(  
 } I(2ID +  
 GlobalFreePtr(lpData); j*P@]&e7d  
 if(nCount==1) sh0O~%]g  
  m_Number.Format("%d picture captured.",nCount); JL <}9K  
 else CxO) d7c  
  m_Number.Format("%d pictures captured.",nCount); X%;,r 2g  
  UpdateData(FALSE); ;m\E9ple  
} NY_Oo!)3  
{r Gx*<e  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) xH92=t-w  
{ @x)z" )>  
 if(pMsg -> message == WM_KEYDOWN) :`_wy-}V  
 { <)M?qkjb  
  if(pMsg -> wParam == VK_ESCAPE) ct/I85c@P  
   return TRUE; y&iLhd!p  
  if(pMsg -> wParam == VK_RETURN)  X'0A"9  
   return TRUE; (A1!)c  
 } }ts?ZR^V,  
 return CDialog::PreTranslateMessage(pMsg); 7UMsKE-  
} iJ~p X\FKO  
GU=h2LSi]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 1aSuRa  
{ oI^iL\\2h  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ thS#fO4]d  
  SaveBmp(); B-o"Y'iXs  
  return FALSE; \"n&|_SZ\  
} 7%aB>uA  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ :qI myaGQ  
 CMenu pop; 9!o:)99U  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); iK)w3S}k1y  
 CMenu*pMenu=pop.GetSubMenu(0); )]v vp{  
 pMenu->SetDefaultItem(ID_EXITICON); ~=}56yxl[  
 CPoint pt; +^`c" qJo  
 GetCursorPos(&pt); D|OX]3~  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this);  Q}G   
 if(id==ID_EXITICON) b+hZ<U/  
  DeleteIcon(); :V`q;g  
 else if(id==ID_EXIT) z. 7 UfLV9  
  OnCancel(); _c`Gxt%  
 return FALSE; P4s:wuJ^  
} 64[j:t=N  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 7pkc*@t  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) n`CmbM@@  
 AddIcon(); D`Fl*Wc4H  
 return res; u U\UULH0  
} Q5baY\"9^  
pS51fF9  
void CCaptureDlg::AddIcon() tk~7>S  
{ ZQ@^(64  
 NOTIFYICONDATA data; TMGZHOAt  
 data.cbSize=sizeof(NOTIFYICONDATA); Dj?9 5Z,r  
 CString tip; 16x M?P  
 tip.LoadString(IDS_ICONTIP); pp/Cn4"w  
 data.hIcon=GetIcon(0); ,)%nLc  
 data.hWnd=GetSafeHwnd(); B>gC75  
 strcpy(data.szTip,tip); bD=_44I  
 data.uCallbackMessage=IDM_SHELL; 24]O0K  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ZcIwyh(`  
 data.uID=98; W)o-aX!P  
 Shell_NotifyIcon(NIM_ADD,&data); OfIml.  
 ShowWindow(SW_HIDE); 5 '.j+{"  
 bTray=TRUE; !k Hpw2  
} 6D) vY  
9].!mpR  
void CCaptureDlg::DeleteIcon() p-M QI }  
{ <^OGJ}G  
 NOTIFYICONDATA data; n&k1'KL&  
 data.cbSize=sizeof(NOTIFYICONDATA); |7%M:7 Q  
 data.hWnd=GetSafeHwnd(); mR?OSeeB  
 data.uID=98; R$wo{{KX  
 Shell_NotifyIcon(NIM_DELETE,&data); s!uewS.  
 ShowWindow(SW_SHOW); Au@U;a4UU  
 SetForegroundWindow(); V&[|%jm&   
 ShowWindow(SW_SHOWNORMAL); pvkru-i]  
 bTray=FALSE; 0!\pS{$zB  
} *S`& X Pj  
cy%^P^M  
void CCaptureDlg::OnChange() SkVW8n*s  
{ ?;!l-Dy  
 RegisterHotkey(); -k")#1  
} & Z*&&  
, En D3 |  
BOOL CCaptureDlg::RegisterHotkey() {-tCLkE 3  
{ |G!-FmIK  
 UpdateData(); nTp?  
 UCHAR mask=0; `G6Nk@9.  
 UCHAR key=0; bv-s}UP0  
 if(m_bControl) { +MqXeq  
  mask|=4; ,,lrF.  
 if(m_bAlt) PudwcP {  
  mask|=2; ,\xeNUZd  
 if(m_bShift) Qgf\gTF$r+  
  mask|=1; HS>Z6|uLY  
  key=Key_Table[m_Key.GetCurSel()]; 2wpLP^9Vr<  
 if(bRegistered){ vaS/WEY  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); e\tcP  
  bRegistered=FALSE; 4ijoAW3A^  
 } cea%M3  
 cMask=mask; 8?J\  
 cKey=key; yIOoVi\m  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ?3k;Yg/  
 return bRegistered; QzCu$ [  
}  ze{  
g;D [XBp  
  四、小结 >a5CW~Z]  
BbnY9"  
  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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