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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:  ;LEO+,6  
  nP`#z&C  
  一、实现方法 6t@kft>Nv  
A'Q=Do E  
  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: w5zr Ek#  
&,E^ y,r  
#pragma data_seg("shareddata") eT 8(O36%  
HHOOK hHook =NULL; //钩子句柄 &("HH"!  
UINT nHookCount =0; //挂接的程序数目 D >ax<t1K  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Hw[(v[v  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 1N8gH&oF  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey TY,5]*86I&  
static int KeyCount =0; /4x3dwXW@  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 > Q[L, I  
#pragma data_seg() $M%<i~VXe&  
W ~(4t:hp  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 T^FeahA7;  
vX|i5P0)8  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: nO-1^HUl  
 %T9'dcM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR fsd,q?{a:  
cKey,UCHAR cMask) J3/2>N]/}  
{ !F ]7q]g  
 BOOL bAdded=FALSE; `-Yo$b;:  
 for(int index=0;index<MAX_KEY;index++){ fePt[U)2  
  if(hCallWnd[index]==0){ U Px7u%Do  
   hCallWnd[index]=hWnd; =e\E{K'f@  
   HotKey[index]=cKey; &oi*]:<FNe  
   HotKeyMask[index]=cMask; !<`}m E!:  
   bAdded=TRUE; e'%"G{(D  
   KeyCount++; ['1JN UX  
   break; _19x`J3  
  } j;%RV)e  
 } ;&="aD  
 return bAdded; }t.J;(ff:  
} 2Cy">Exl  
//删除热键 |Uf[x[  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ZWJ%t'kF  
{ E1'| ;}/  
 BOOL bRemoved=FALSE; }?PvNK]",  
 for(int index=0;index<MAX_KEY;index++){ C|"BMam  
  if(hCallWnd[index]==hWnd){ *WS'C}T  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4n1-@qTPF~  
    hCallWnd[index]=NULL; 4q%hn3\  
    HotKey[index]=0; o0SQJ1.a$  
    HotKeyMask[index]=0; #Z%?lx"Q0  
    bRemoved=TRUE; M@)^*=0H  
    KeyCount--; [+7 Nu  
    break; f( =3'wQ  
   } eAkC-Fm  
  } ]*fiLYe9  
 } &+"-'7  
 return bRemoved; -TL `nGF  
} @C\>P49  
47 ]?7GU,  
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  DLL中的钩子函数如下: SU. 9;I !  
`8 Q3=^)3  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) gD$bn=  
{  x!)[l;  
 BOOL bProcessed=FALSE; m5Q?g8  
 if(HC_ACTION==nCode) /%O+]#$`0  
 { ^uG^XY&ItC  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 AfQ?jKk&{'  
   switch(wParam) 3RYg-$NK[  
   {  Xgq-r $O2X  
    case VK_MENU: "l83O8 L  
     MaskBits&=~ALTBIT; 2y_R05O0  
     break; M{sn{  
    case VK_CONTROL: Ojea~Y]Sr  
     MaskBits&=~CTRLBIT; |[%CFm}+?  
     break; e G8Zn<:s  
    case VK_SHIFT: RDFOUqS  
     MaskBits&=~SHIFTBIT; P1 \:hh  
     break; +Ndo$|XCy]  
    default: //judge the key and send message ;{@jj0h;  
     break; FPg5!O%  
   } :Ng4? +@r  
   for(int index=0;index<MAX_KEY;index++){ ;|nC;D]  
    if(hCallWnd[index]==NULL) [X9s\H  
     continue; drv"I[}{A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) MXQ S6F#  
    { _6Ex}`fyJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ZH@BHg|}H  
     bProcessed=TRUE; h~\bJ*Zp  
    } ]g}Tqf/N%  
   } :#yjg1aej  
  } _1<zpHp  
  else if((lParam&0xc000ffff)==1){ //有键按下  G{4~{{tI  
   switch(wParam) F0&BEJBkU  
   { RA5*QW  
    case VK_MENU: ;c>Co:W  
     MaskBits|=ALTBIT; PP+-D~r`}  
     break; CBj&8#8Z  
    case VK_CONTROL: *F ya qJ)  
     MaskBits|=CTRLBIT; V={`k$p  
     break; Er 4P  
    case VK_SHIFT: Muhq,>!U  
     MaskBits|=SHIFTBIT; tA,#!Z0  
     break; gWqO5C~h  
    default: //judge the key and send message ]yR0"<W^xO  
     break; ,{KjVv<  
   } NZj_7j|o9  
   for(int index=0;index<MAX_KEY;index++){ rSGt`#E-s.  
    if(hCallWnd[index]==NULL) !;[cm|<E  
     continue; zAr@vBfC%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  xr }jw  
    { E`^?2dv+/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); i;'kQ  
     bProcessed=TRUE; >Ei-Spy>Xl  
    } vai.w-}Z  
   } oH[4<K>  
  } ig] hY/uT  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 jjs1Vj1@<  
   for(int index=0;index<MAX_KEY;index++){ uude<d"U  
    if(hCallWnd[index]==NULL) <%@S-+D`]  
     continue; ~-1!?t/%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) d;Uzl 1;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); pO2Y'1*  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 aP%& -W$D|  
   } ZO`{t1   
  } @D<KG  
 } e-}b]\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "cK@Yo  
} %Q)3*L  
Q@7-UIV|q  
  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: 4{[cXM8*j  
8SG*7[T7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  3,7SGt r  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); aN87^[  
Do&em8i z  
  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: 'h?;i2[  
3L;GfYr0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2J^jSgr50d  
{ ;M<jQntqS{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) p@/i e@DX  
 { .x 1&   
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 c[/h7!/aH  
  SaveBmp(); k8]uy2R6}  
  return FALSE; NlBnV  
 } 9c /&+j  
 …… //其它处理及默认处理 \xQ10\u  
} ~y#jq,i/  
/& qN yo  
f*+eu @  
  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。 h{dR)#)GF<  
Z+zx*(X  
  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。 >bKN$,Qen  
b~M3j&  
  二、编程步骤 b r"4 7i  
!,f#oCL  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; rUb`_W@  
NAy3Zd}  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; {}vB# !  
r9x.c7=O  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; :3,aR\  
0a#2 Lo  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ]cz*k/*0  
fvW7a8k3  
  5、 添加代码,编译运行程序。 Bf&,ACOf  
WVP^C71  
三、程序代码 gC}r$ZB(  
M]S&vE{D  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL %&c+} m  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) E(5'vr0  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Ol}^'7H  
#if _MSC_VER > 1000 1NP(3yt%  
#pragma once _x.!, g{  
#endif // _MSC_VER > 1000 [OH9/ "  
#ifndef __AFXWIN_H__ t)y WQV  
#error include 'stdafx.h' before including this file for PCH 1>JUI5 {  
#endif d+5KHfkK  
#include "resource.h" // main symbols !y8/El  
class CHookApp : public CWinApp l?+67cQLA  
{ XJ3 5Z+M  
 public: $1Lm=2;U  
  CHookApp();  i7qG5U  
  // Overrides mN_KAln  
  // ClassWizard generated virtual function overrides :{iS0qJ  
  //{{AFX_VIRTUAL(CHookApp) t%<@k)hd~G  
 public: <i~MBy. (  
  virtual BOOL InitInstance(); MX=mGfoa  
  virtual int ExitInstance(); XO*|P\#^  
  //}}AFX_VIRTUAL qusX]Tst z  
  //{{AFX_MSG(CHookApp) 3Mvm'T:[  
  // NOTE - the ClassWizard will add and remove member functions here. E~=`Ac,G2  
  // DO NOT EDIT what you see in these blocks of generated code ! hFDY2Cp]D  
  //}}AFX_MSG tgu}^TfKkg  
  DECLARE_MESSAGE_MAP() sqAZjfy@  
}; '.n0[2>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Gw"H#9J} T  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,ux?wa+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !nQ!J+ g  
BOOL InitHotkey(); 1-@[th  
BOOL UnInit(); NJEubC?  
#endif }Q7 ~tu  
Et\z^y  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. e 1W9Z $m  
#include "stdafx.h" >680}\S  
#include "hook.h" +doZnU,  
#include <windowsx.h> #d+bld\  
#ifdef _DEBUG ,tdV-9N[O  
#define new DEBUG_NEW Ppw0vaJ^  
#undef THIS_FILE [B}$U|V0  
static char THIS_FILE[] = __FILE__; Ax D&_GT  
#endif 95.m^~5  
#define MAX_KEY 100 jU1([(?"  
#define CTRLBIT 0x04 ?8cgQf$  
#define ALTBIT 0x02 {uO=Wkp~7  
#define SHIFTBIT 0x01 7$ vs X  
#pragma data_seg("shareddata") {q9[0-LyJ  
HHOOK hHook =NULL; 9v=fE2`-  
UINT nHookCount =0; 3BBw:)V  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ar-N4+!@  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT %3L4&W _T  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey _]SV@q^  
static int KeyCount =0; |hsg= LX  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift [.M<h^xrB  
#pragma data_seg() ?a ~59!u  
HINSTANCE hins; W^}fAcQKH  
void VerifyWindow(); aCu 8 D!  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) \2q!2XWgK  
//{{AFX_MSG_MAP(CHookApp) ^Ge3"^x1  
// NOTE - the ClassWizard will add and remove mapping macros here. -)biSU,  
// DO NOT EDIT what you see in these blocks of generated code! N5>ioJj  
//}}AFX_MSG_MAP by 'P}  
END_MESSAGE_MAP() 9oOr-9t3  
_*d8:|qw  
CHookApp::CHookApp() o!q3+Pp;}  
{ D4e*Wwk  
 // TODO: add construction code here, i%jti6z$Hr  
 // Place all significant initialization in InitInstance 1#KE4(  
} |7$F r[2d  
{+CW_ce  
CHookApp theApp; ZWZRG-:&H  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) inO)Y]|f  
{ Nj8 `<Sl  
 BOOL bProcessed=FALSE; gq[|>Rs75  
 if(HC_ACTION==nCode) ,e6n3]W8  
 { ,+0#.N s$  
  if((lParam&0xc0000000)==0xc0000000){// Key up f+#^Lngo  
   switch(wParam) ^Ht!~So  
   { *D&(6$[^  
    case VK_MENU: W_ w^"'  
     MaskBits&=~ALTBIT; T%GdvtmS>  
     break; 2g>4fZ  
    case VK_CONTROL: a[ Pyxx_K  
     MaskBits&=~CTRLBIT; E-P;3lS~  
     break; wc&%icF*cr  
    case VK_SHIFT: lX^yd5M&f  
     MaskBits&=~SHIFTBIT; >HvgU_  
     break; u9-:/<R#}y  
    default: //judge the key and send message q)Qd+:a7{  
     break; jNKu5"HB  
   } Q\WH2CK  
   for(int index=0;index<MAX_KEY;index++){ ZE+VLV v  
    if(hCallWnd[index]==NULL) Ce: 2Tw  
     continue; U^ bF}4m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A 9 I5  
    { @'go?E)f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 99GzhX_  
     bProcessed=TRUE; gXrPZ|iS  
    } 6[r-8_  
   } x+?P/Ckg  
  } Mf 7 Z5  
  else if((lParam&0xc000ffff)==1){ //Key down ={HYwP;  
   switch(wParam) &NvvaqJ  
   { iUNlNl ?  
    case VK_MENU: a?_!  
     MaskBits|=ALTBIT; ;+d2qbGd  
     break; _!vxX ]  
    case VK_CONTROL: R07 7eX  
     MaskBits|=CTRLBIT; O$<m(~[S  
     break; K9{]v=#I  
    case VK_SHIFT: 2vb{PQ  
     MaskBits|=SHIFTBIT; >_R,^iH"  
     break; ^T(v4'7  
    default: //judge the key and send message t0^chlJP$  
     break; p6UPP|-S  
   } }vp pn=[Y  
   for(int index=0;index<MAX_KEY;index++) ii< /!B(  
   { PVK. %y9  
    if(hCallWnd[index]==NULL) wH?r522`c  
     continue; 8G GC)2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0A]+9@W;  
    { =6PTT$,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _J|cJ %F>%  
     bProcessed=TRUE; {KH!PAh  
    } KwEyMR!  
   } yeI((2L@E2  
  } Qn=#KS8=J  
  if(!bProcessed){ eSAB :L,K  
   for(int index=0;index<MAX_KEY;index++){ A6ar@$MZ  
    if(hCallWnd[index]==NULL) !CJh6X !  
     continue; B,2oA]W"S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) mmN!=mf*  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;nzzt~aCC  
   } PWavq?SR  
  } s{QS2G$5  
 } 0a1Vj56{)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #*J+4a w3  
} 2u B66i  
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BOOL InitHotkey() @51!vQwqR  
{ Xs,[Z2_iq  
 if(hHook!=NULL){ {*#}"/:8K  
  nHookCount++; )GbVgYkk  
  return TRUE; 8eAc 5by  
 } #YABb wH  
 else $w:7$:k  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); &:]ej6 V'[  
  if(hHook!=NULL) =Gl6~lJ{_  
   nHookCount++; UKfC!YR2J8  
  return (hHook!=NULL); dV~d60jOF  
} 28u3B2\$  
BOOL UnInit() 71g\fGG\  
{ -#TF&-  
 if(nHookCount>1){ ;+86q"&n  
  nHookCount--; f( %r)%  
  return TRUE; ^@"H(1Hxu/  
 } 5eP0W#  
 BOOL unhooked = UnhookWindowsHookEx(hHook); n]K`ofjl^  
 if(unhooked==TRUE){ )MV`(/BC*  
  nHookCount=0; ZUkrJ'  
  hHook=NULL; aDDs"DXx  
 } |._9;T-Yde  
 return unhooked; cH== OM7&-  
} KNI* :  
?3=D-Xrb  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) GS<aXh k  
{ ~7kIe+V  
 BOOL bAdded=FALSE; vt(A?$j|A  
 for(int index=0;index<MAX_KEY;index++){ 1\hh,s  
  if(hCallWnd[index]==0){ P&6hk6#  
   hCallWnd[index]=hWnd; Q&JnF`*  
   HotKey[index]=cKey; U]8 @  
   HotKeyMask[index]=cMask; Ao2m"ym  
   bAdded=TRUE; 49e~/YY  
   KeyCount++; L`iC?<}  
   break; O8!> t7x  
  } 9f wFSJx  
 } TgDx3U[  
 return bAdded; l^LYSZg'R8  
} rM{3]v{~  
ptA-rX.  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ts~MkO  
{ s#nd:$p3  
 BOOL bRemoved=FALSE; +"~~; J$  
 for(int index=0;index<MAX_KEY;index++){  q#=}T~4j  
  if(hCallWnd[index]==hWnd){ T+$Af,~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6+Y^A})(F-  
    hCallWnd[index]=NULL; ! u4'1jd[d  
    HotKey[index]=0; Vk3xWD~  
    HotKeyMask[index]=0; "Z\^dR  
    bRemoved=TRUE; `1 tD&te0  
    KeyCount--; w^rINPAS  
    break; h 8ND=(  
   } !BQ:R(w  
  } )/B' ODa  
 } hwon ^?  
 return bRemoved; Msk^H7  
} >3{l"SPU  
NHL -ll-R  
void VerifyWindow() 96 oztUK  
{ ;$0)k(c9  
 for(int i=0;i<MAX_KEY;i++){ KX|7mr90K  
  if(hCallWnd!=NULL){ qjtrU#n  
   if(!IsWindow(hCallWnd)){  C0Oe$& _  
    hCallWnd=NULL;  {[i 37DN  
    HotKey=0; fw[Z7`\Q5  
    HotKeyMask=0; `.0WK  
    KeyCount--; Em(&cra  
   } L#\!0YW/@  
  } 0-N"_1k|?  
 } DbL=2  
} !8z,}HUdK  
@@])B#  
BOOL CHookApp::InitInstance() BB>R=kt  
{ !_ng_,J  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); @Yl&Jg2l'  
 hins=AfxGetInstanceHandle(); m$w'`[H  
 InitHotkey(); fD1a)Az  
 return CWinApp::InitInstance(); Z^fkv  
} P:p@Iep  
EWr8=@iU  
int CHookApp::ExitInstance() N'!:  
{ 9"#,X36  
 VerifyWindow(); +O2z&a;q  
 UnInit(); e*zt;SR  
 return CWinApp::ExitInstance(); O< \i{4}}  
} K<_bG<tm_  
'f?=ks<  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file p>O>^R  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) | M|5Nc>W  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 5y1:oiE/  
#if _MSC_VER > 1000 tbNIl cAWS  
#pragma once U6B-{l:W  
#endif // _MSC_VER > 1000 AWXBk+  
/c>@^  
class CCaptureDlg : public CDialog =Eh~ wm  
{ !^,<nP  
 // Construction pKxq\U  
 public: 5Y#W$Fx($R  
  BOOL bTray; #cZ<[K q6  
  BOOL bRegistered; +ROwk  
  BOOL RegisterHotkey(); YyF=u~l  
  UCHAR cKey; `u *:wJsv  
  UCHAR cMask; TsvF~Gdp  
  void DeleteIcon(); (;Ad:!9{  
  void AddIcon(); y1FE +EX[  
  UINT nCount; +im>|  
  void SaveBmp(); ZbZCW:8>k  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor zS6oz=  
  // Dialog Data HZ+l){u  
  //{{AFX_DATA(CCaptureDlg) -/7[\S  
  enum { IDD = IDD_CAPTURE_DIALOG }; XITh_S4fs=  
  CComboBox m_Key; SGp}(j>  
  BOOL m_bControl;  3g#  
  BOOL m_bAlt; BbV@ziL  
  BOOL m_bShift; d7*fP S  
  CString m_Path; Rl%?c5U/$  
  CString m_Number; : }q~<  
  //}}AFX_DATA P>i!f!o*I  
  // ClassWizard generated virtual function overrides %#zqZ|q  
  //{{AFX_VIRTUAL(CCaptureDlg) UP})j.z  
 public: cGE,3dsF[  
  virtual BOOL PreTranslateMessage(MSG* pMsg); { +$zgg  
 protected: &`9p.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support lo!.%PP|  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); sgc pH  
  //}}AFX_VIRTUAL E;m-^dxc  
  // Implementation Ow@ }6&1  
 protected: /jtU<uX  
  HICON m_hIcon; v{T%`WuPRf  
  // Generated message map functions  s_p\ bl.  
  //{{AFX_MSG(CCaptureDlg) FVgE^_  
  virtual BOOL OnInitDialog(); /3!c ;(  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); DC-tBbQkk  
  afx_msg void OnPaint(); 'Pm.b}p<  
  afx_msg HCURSOR OnQueryDragIcon(); CBVL/pxy  
  virtual void OnCancel(); #ox &=MY  
  afx_msg void OnAbout(); <uYeev%  
  afx_msg void OnBrowse(); kw gsf5[  
  afx_msg void OnChange(); 0?{Y6:d+  
 //}}AFX_MSG qSg=[7XOO  
 DECLARE_MESSAGE_MAP() 4dgo*9  
}; aYBc)LCd  
#endif w`Ss MI  
s9p~  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file BKfkB[*F  
#include "stdafx.h" w|AHE  
#include "Capture.h" YIc|0[ ]*|  
#include "CaptureDlg.h" 8q5 `A Gl  
#include <windowsx.h> 7@6B\':  
#pragma comment(lib,"hook.lib") [2 yxTK  
#ifdef _DEBUG g9XAUZe  
#define new DEBUG_NEW /ta5d;@  
#undef THIS_FILE /|HVp  
static char THIS_FILE[] = __FILE__; t 5{Y'  
#endif a#k=! W  
#define IDM_SHELL WM_USER+1 gI /#7Cr  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _?YP0GpU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #3h~Z)+y  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; .C=I~Z  
class CAboutDlg : public CDialog b)e';M  
{ V(^aG=TaW:  
 public: : CR1Oy9  
  CAboutDlg(); dP7nR1GS  
  // Dialog Data ,1!~@dhs  
  //{{AFX_DATA(CAboutDlg) @N%/v*  
  enum { IDD = IDD_ABOUTBOX }; dh~ cj5  
  //}}AFX_DATA B9[eLh!  
  // ClassWizard generated virtual function overrides dHUcu@,  
  //{{AFX_VIRTUAL(CAboutDlg) CU7WK}2h2C  
 protected: _^(}6o  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,+Bp>=pvs  
  //}}AFX_VIRTUAL Jj :Bi&C  
  // Implementation K*]^0  
 protected: \{RMj"w:  
  //{{AFX_MSG(CAboutDlg) R=ipK63  
  //}}AFX_MSG 4L`<xX;:{  
  DECLARE_MESSAGE_MAP() v[*&@aW0n  
}; MB:VACCr  
2l YA% n  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) U^@8ebv  
{ E;>Bc Pt5  
 //{{AFX_DATA_INIT(CAboutDlg) O9_S"\8]@  
 //}}AFX_DATA_INIT 7F;dLd'  
} ~*-%tFSv  
"8%z,lHw  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9wB}EDZ  
{ uHNh|ew21  
 CDialog::DoDataExchange(pDX); [Up0<`Q{I_  
 //{{AFX_DATA_MAP(CAboutDlg) Z6F^p8O-  
 //}}AFX_DATA_MAP D rMG{Yiu  
} }iZ>Gm '5  
s&gzv=v  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ifYC&5}SI  
 //{{AFX_MSG_MAP(CAboutDlg) ,m08t9F  
 // No message handlers ee7{5  
 //}}AFX_MSG_MAP 4P(ysTuM  
END_MESSAGE_MAP() %dN',  
c'LDHh7b  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) s.8]qQRr  
: CDialog(CCaptureDlg::IDD, pParent) TlA*~HG<Q  
{ iax6o+OG|  
 //{{AFX_DATA_INIT(CCaptureDlg) F\H^=P  
  m_bControl = FALSE; Jm5&6=  
  m_bAlt = FALSE; bTrQ(qp  
  m_bShift = FALSE; -2\%?A6L  
  m_Path = _T("c:\\"); j0]|$p  
  m_Number = _T("0 picture captured."); `O'@TrI  
  nCount=0; `n{yls7.  
  bRegistered=FALSE; G=Qslrtg  
  bTray=FALSE; i]L4kh5  
 //}}AFX_DATA_INIT G9_M~N%a  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &E{i#r)'T  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 2o\GU  
} Z ^w5x:  
+=qazE<:0  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Y unY'xY  
{ +~H mP Q  
 CDialog::DoDataExchange(pDX); } XJZw|n  
 //{{AFX_DATA_MAP(CCaptureDlg) $:aKb#l)  
  DDX_Control(pDX, IDC_KEY, m_Key); DOzJ-uww1  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); u>cU*E4/  
  DDX_Check(pDX, IDC_ALT, m_bAlt); pH'1be{K  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ?Ww\D8yV&  
  DDX_Text(pDX, IDC_PATH, m_Path); _ 1? PN8  
  DDX_Text(pDX, IDC_NUMBER, m_Number); @NY$.K#]  
 //}}AFX_DATA_MAP qDPpGI-Y2e  
} Ijs"KAW ?  
u3Jsu=Nx-  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ^&|$&7  
//{{AFX_MSG_MAP(CCaptureDlg) |RdiM&C7  
 ON_WM_SYSCOMMAND() n5yPUJK2L6  
 ON_WM_PAINT() !N:: 1c@C  
 ON_WM_QUERYDRAGICON() 3XeCaq'N  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) QvF UFawN  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2qY+-yOEt  
 ON_BN_CLICKED(ID_CHANGE, OnChange) \qU.?V[2  
//}}AFX_MSG_MAP =h"*1`  
END_MESSAGE_MAP() Mv O!p  
L,QAE)S'a  
BOOL CCaptureDlg::OnInitDialog() R\oas"  
{ ;h }^f-  
 CDialog::OnInitDialog(); dF- d  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); wW1E 'Vy{  
 ASSERT(IDM_ABOUTBOX < 0xF000); e+ZC<Bdh  
 CMenu* pSysMenu = GetSystemMenu(FALSE); -bq\2Yc$]  
 if (pSysMenu != NULL) XP$1CWI  
 { -i}@o1o\  
  CString strAboutMenu; #$qhxYyd  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ZUW~ZZ7Z:  
  if (!strAboutMenu.IsEmpty()) /wj L<  
  { _DAAD,'<a  
   pSysMenu->AppendMenu(MF_SEPARATOR); F>F&+63Q-  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); f17pwJ~=  
  } N8Mq0Ck{$  
 } +QqEUf<U*,  
 SetIcon(m_hIcon, TRUE); // Set big icon ]('isq,P  
 SetIcon(m_hIcon, FALSE); // Set small icon '$cU\DTN6  
 m_Key.SetCurSel(0); m;v/(d>  
 RegisterHotkey(); Ff\U]g  
 CMenu* pMenu=GetSystemMenu(FALSE); 3j2% '$>E^  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); #Moju  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); f y|Ae  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); mST/u>'  
 return TRUE; // return TRUE unless you set the focus to a control -6+&?f  
} nsq7,%5  
E+65  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) @'K+   
{ e:BKdZGW  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) CPI7&jqu  
 { hE-u9i  
  CAboutDlg dlgAbout; N o}Ly{  
  dlgAbout.DoModal(); @nJ#kd[  
 } iCouGd}  
 else =;1MpD  
 { olC@nQ1c*  
  CDialog::OnSysCommand(nID, lParam); >D';i\2j&  
 } jocu=Se@  
} xl(];&A3  
Z'%k`F  
void CCaptureDlg::OnPaint() X3KP N  
{ *lN>RWbM%  
 if (IsIconic()) &k5 Z|d|  
 { >^@/Ba$h  
  CPaintDC dc(this); // device context for painting XK)qDg  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); <tEN1i  
  // Center icon in client rectangle hr8v O"tZN  
  int cxIcon = GetSystemMetrics(SM_CXICON); r9/PmZo4x  
  int cyIcon = GetSystemMetrics(SM_CYICON); +yq Z\$ii  
  CRect rect; m|O7@N  
  GetClientRect(&rect); ]JeA29   
  int x = (rect.Width() - cxIcon + 1) / 2; H1,;Xrm  
  int y = (rect.Height() - cyIcon + 1) / 2; K"cN`Kj<*-  
  // Draw the icon .1yp}&e#  
  dc.DrawIcon(x, y, m_hIcon); %2<G3]6^U  
 } ]F@XGJN  
 else * Yr)>;^  
 { +fd^$Qd%K  
  CDialog::OnPaint(); RNyw`>  
 } N1RZ  
} iBy:HH  
]-$0?/`p8  
HCURSOR CCaptureDlg::OnQueryDragIcon() mis cmD  
{ /\-qz$  
 return (HCURSOR) m_hIcon; k,xY\r$  
} f$x\~y<[  
:N~1fvx  
void CCaptureDlg::OnCancel() ;a/Gs^W  
{ Tn+6:<OFdO  
 if(bTray) 9L}=xX`>?  
  DeleteIcon(); ta*B#2D>  
  CDialog::OnCancel(); ,%+i}H,3  
} 6xs_@Vk|d  
/-wAy-W  
void CCaptureDlg::OnAbout() kzhncku  
{ JkazB1h  
 CAboutDlg dlg; a_YE[6  
 dlg.DoModal(); aClXg-  
} DiyviH  
+$:bzo_u  
void CCaptureDlg::OnBrowse() CT@JNG$<"  
{ .kSx>3  
 CString str; @N`) Z3P+  
 BROWSEINFO bi; Y!LcS48X  
 char name[MAX_PATH]; d v@B-l;  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); g_G'%{T7  
 bi.hwndOwner=GetSafeHwnd(); 2*6b{}yJH  
 bi.pszDisplayName=name; ">}l8MA  
 bi.lpszTitle="Select folder"; y K~;LV  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; a%"My;8  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); G J=<~S"  
 if(idl==NULL) !5Ko^:+Y  
  return; W8Z&J18AU  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); $UMxO`F  
 str.ReleaseBuffer(); u@\]r 1  
 m_Path=str; H gMLh*  
 if(str.GetAt(str.GetLength()-1)!='\\') +53 Tf  
  m_Path+="\\"; 'W 5r(M4U  
 UpdateData(FALSE);  9x/HQ(1  
} ?Gc9^b B I  
LlP_`fA  
void CCaptureDlg::SaveBmp() s+>VqyHgf  
{ U+t|wK  
 CDC dc; Gxu&o%x [  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); dUOvv/,FZT  
 CBitmap bm; kAbRXID  
 int Width=GetSystemMetrics(SM_CXSCREEN); C2;qSKG3{m  
 int Height=GetSystemMetrics(SM_CYSCREEN); 0FfBD[E:  
 bm.CreateCompatibleBitmap(&dc,Width,Height); &k+G^ !=s#  
 CDC tdc; Paz yY   
 tdc.CreateCompatibleDC(&dc); jk2h"):B>  
 CBitmap*pOld=tdc.SelectObject(&bm); zhbp"yju7  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 9 WsPBzi"T  
 tdc.SelectObject(pOld); $d M: 5y  
 BITMAP btm; s5T$>+ a  
 bm.GetBitmap(&btm); nS0K&MH6B  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; a;J{'PHu  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 5 T1M:~u i  
 BITMAPINFOHEADER bih; Q}~of}h/  
 bih.biBitCount=btm.bmBitsPixel; %j%}iM/(<  
 bih.biClrImportant=0; 1>OfJc(K  
 bih.biClrUsed=0; [H5TtsQ[  
 bih.biCompression=0; TN}YRXtW+  
 bih.biHeight=btm.bmHeight; ]q DhGt  
 bih.biPlanes=1; aJlSIw*Q,  
 bih.biSize=sizeof(BITMAPINFOHEADER); beFVjVVHq  
 bih.biSizeImage=size; FN5*pVD;<  
 bih.biWidth=btm.bmWidth; "Zd4e2>{M\  
 bih.biXPelsPerMeter=0; B#'TF?HUEn  
 bih.biYPelsPerMeter=0; TQDb\d8,f  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [H-,zY  
 static int filecount=0; 1\:puC\)  
 CString name; R{.5Z/Vp6E  
 name.Format("pict%04d.bmp",filecount++); Fx2z lM&  
 name=m_Path+name; >VnkgY  
 BITMAPFILEHEADER bfh; "h'0&ZP~_  
 bfh.bfReserved1=bfh.bfReserved2=0; d:C-   
 bfh.bfType=((WORD)('M'<< 8)|'B'); <:)T7yVq  
 bfh.bfSize=54+size; S 8mqz.  
 bfh.bfOffBits=54; /Fej)WQp  
 CFile bf; @EH:4~  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @^oOXc,r$  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ^~Nz8PCY  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ^D8 YF  
  bf.WriteHuge(lpData,size); Mp*")N,  
  bf.Close(); kRs(A~ngc  
  nCount++; elCDPZTf  
 } :Xc%_&)  
 GlobalFreePtr(lpData); Mi&,64<  
 if(nCount==1) =s`\W7/;{-  
  m_Number.Format("%d picture captured.",nCount); 1UX"iO x(  
 else 59gt#1k  
  m_Number.Format("%d pictures captured.",nCount); jPg8>Z&D  
  UpdateData(FALSE); EzOO6  
} 2@ vSe  
-M}#-qwf  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ;u!qu$O  
{ 0Qvbc}KP8  
 if(pMsg -> message == WM_KEYDOWN) 4*W ??(=j  
 { Uj&2'>MJ$  
  if(pMsg -> wParam == VK_ESCAPE) B Jp\a7`;  
   return TRUE; ?1JVzZ4H  
  if(pMsg -> wParam == VK_RETURN) ;Pik},  
   return TRUE; l-4T Tg  
 } PV vNu5k  
 return CDialog::PreTranslateMessage(pMsg); '"LrGvkZ  
} bFk >IifN  
+h^>?U,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) | Zx  
{ X=)Ue  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ "M5P-l$p}  
  SaveBmp(); MkZm =Sf  
  return FALSE; w!o[pvyR$  
} ;rWgt!l  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 44 ,:@  
 CMenu pop; 'F3Xb  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); S'qEBz  
 CMenu*pMenu=pop.GetSubMenu(0); 62K7afH  
 pMenu->SetDefaultItem(ID_EXITICON); T{v(B["!$  
 CPoint pt; cmF&1o3_  
 GetCursorPos(&pt); o %sBU  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); q y73  
 if(id==ID_EXITICON) 57IAH$n8o  
  DeleteIcon(); ^c3~CD5H 3  
 else if(id==ID_EXIT) 6KPM4#61o  
  OnCancel(); ;$Q `JN=  
 return FALSE; bI.LE/yk  
} K5gh7  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ^T`)ltI]V  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Xwy0dXko  
 AddIcon(); =4cK9ac  
 return res; 4hdxqI!y2  
} T!e ]=  
)$K )`uqb  
void CCaptureDlg::AddIcon() =?>f[J5  
{ q15t7-Z6  
 NOTIFYICONDATA data; Sc'z vlq  
 data.cbSize=sizeof(NOTIFYICONDATA); Xdj` $/RI  
 CString tip; >2tQ')%DJ  
 tip.LoadString(IDS_ICONTIP); -b+VzVJZ  
 data.hIcon=GetIcon(0); Cm g(# $ X  
 data.hWnd=GetSafeHwnd(); Q!8AFLff4  
 strcpy(data.szTip,tip); \}Fx''  
 data.uCallbackMessage=IDM_SHELL; U 2am1}  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; @qk$ 6X  
 data.uID=98; <?'d \B  
 Shell_NotifyIcon(NIM_ADD,&data); O?e38(  
 ShowWindow(SW_HIDE); % LeG.~?  
 bTray=TRUE; $,$bZV  
} K|nh`r   
= TKu2  
void CCaptureDlg::DeleteIcon() yq+'O&+   
{ bb}zn'xC  
 NOTIFYICONDATA data; mn;;wp  
 data.cbSize=sizeof(NOTIFYICONDATA); mxk :P  
 data.hWnd=GetSafeHwnd(); 8A/"ia  
 data.uID=98; *TQXE:vZ[  
 Shell_NotifyIcon(NIM_DELETE,&data); umZy=KHj  
 ShowWindow(SW_SHOW); ZGgKCCt  
 SetForegroundWindow(); Rd~-.&   
 ShowWindow(SW_SHOWNORMAL); 9/3gF)I}  
 bTray=FALSE; xtW Q.  
} &}:'YK*X  
 SyFw  
void CCaptureDlg::OnChange() -d]-R ?mQ  
{ Z.6M~  
 RegisterHotkey(); !$N^Ak5#  
} {`,dWjy{%  
_/Ky;p.  
BOOL CCaptureDlg::RegisterHotkey() Xkc y~e  
{  tKOTQ8i4  
 UpdateData(); R:c$f(aKv%  
 UCHAR mask=0;  >d-By  
 UCHAR key=0; ("07t/||  
 if(m_bControl) R6l`IlG`  
  mask|=4; A;ip V :)  
 if(m_bAlt) Cw7 07  
  mask|=2; |#9Nu9ak  
 if(m_bShift) " &2Kvsz  
  mask|=1; "D#+:ix8G|  
  key=Key_Table[m_Key.GetCurSel()]; 91%QO?hz  
 if(bRegistered){ BSt^QH-'  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); }jHS  
  bRegistered=FALSE; MH@=Qqx#=t  
 } <,!8xp7,~  
 cMask=mask; r4&g~+ck  
 cKey=key; pu#h:nb>88  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); | a001_Wv  
 return bRegistered; 50r3Kl0  
} vN#?>aL  
0#1hkJ"  
  四、小结 M)4-eo  
~q]@Jp  
  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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