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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: +X;6%O;  
  US7hKNm.  
  一、实现方法 RkLH}`#  
XR\ iQ  
  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: hBE}?J>  
IHo6&  
#pragma data_seg("shareddata") jVRd[  
HHOOK hHook =NULL; //钩子句柄 X2i<2N*@  
UINT nHookCount =0; //挂接的程序数目 eS@RA2  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 mc(&'U8R0I  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 -r-`T s  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey /p>"|z  
static int KeyCount =0; 3 XfXMVm  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 }C#YR( ]  
#pragma data_seg() 6w}:w?=6  
jd2Fh):q  
  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。 m2|0<P@k!  
!gf&l ^)  
  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: JpD YB  
5Cy)#Z{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR  ]NAPvw#p  
cKey,UCHAR cMask) GN1cnM>`  
{ X\%],"9%  
 BOOL bAdded=FALSE; {b<8Z*4W  
 for(int index=0;index<MAX_KEY;index++){ )X^nzhZ2O"  
  if(hCallWnd[index]==0){ ydns_Z  
   hCallWnd[index]=hWnd; #zy,x  
   HotKey[index]=cKey; +]]wf'w  
   HotKeyMask[index]=cMask; g'Xl>q  
   bAdded=TRUE; 7FDraEr#f  
   KeyCount++; T>uLqd{hH  
   break; F'j:\F6C;  
  } )edM@beY_  
 } Z=F=@<!  
 return bAdded; Wt3\&.n  
} \R-u+ci$ZY  
//删除热键 NM8 F  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z@ws,f^e  
{ ?|hzAF"U  
 BOOL bRemoved=FALSE; 0KDDAkR5R  
 for(int index=0;index<MAX_KEY;index++){ ,Fr{i1Ky  
  if(hCallWnd[index]==hWnd){ -~(0:@o ;  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &6\rKOsn  
    hCallWnd[index]=NULL; @6D<D6`  
    HotKey[index]=0; p[o2F5 T2  
    HotKeyMask[index]=0; #^v5Eo  
    bRemoved=TRUE; E?XA/z !  
    KeyCount--; >leOyBEAR  
    break; r>)\"U#  
   } g(5s{njL  
  } Oy|9po  
 } e8lF$[i  
 return bRemoved; Q49|,ou[H  
} \:=Phbn  
Sej$x)Q\t  
5;^8wh(  
  DLL中的钩子函数如下: 84 knoC  
ev?>Nq+Z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) '[-/X a['  
{ ttw@nv% @  
 BOOL bProcessed=FALSE; yQx>h6  
 if(HC_ACTION==nCode) ;:!LAe  
 { #SqOJX~Q  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 9xKFX|*$  
   switch(wParam) XW#4C*5?d  
   {  Lw#h nLI.  
    case VK_MENU: z H \*v'  
     MaskBits&=~ALTBIT; e.jgV=dT-  
     break; Z?x]HB`r  
    case VK_CONTROL: {[9^@k  
     MaskBits&=~CTRLBIT; '  qM3.U  
     break; ZbGyl}8ua  
    case VK_SHIFT: isd[l-wAmf  
     MaskBits&=~SHIFTBIT; Ka{IueSs  
     break; R #ZDB]2  
    default: //judge the key and send message ~clWG-i  
     break; =[k9{cVW  
   } pj )I4C)  
   for(int index=0;index<MAX_KEY;index++){ I0ie3ESdN  
    if(hCallWnd[index]==NULL) w}1)am &pD  
     continue; Sph+kiy|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =_1" d$S&  
    { ld?M,Qd  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2~@=ua[|=5  
     bProcessed=TRUE; sS|zz,y  
    } AHA*yC  
   } .6"7Xxe]<  
  } DuE>KX{<!R  
  else if((lParam&0xc000ffff)==1){ //有键按下 )3 r1; ^W  
   switch(wParam) d}=p-s.GA  
   { ,\m c.80  
    case VK_MENU: .U3p~M+  
     MaskBits|=ALTBIT; f*5"Jh@  
     break; v8X&H  
    case VK_CONTROL: UB1/FM4~  
     MaskBits|=CTRLBIT; H{XW?O^@  
     break; <h}?0NA4  
    case VK_SHIFT: 5[R}MhLZ  
     MaskBits|=SHIFTBIT; _YJwF1e+M  
     break; NWpRzh8$u  
    default: //judge the key and send message fU}w81oe  
     break; i!HGM=f  
   } 'IP!)DS  
   for(int index=0;index<MAX_KEY;index++){ 'I~dJEW7  
    if(hCallWnd[index]==NULL) %qQ(@TG  
     continue; 4mAtYm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }Q=Zqlvz  
    { _SaK]7}m!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Vg+SXq6G  
     bProcessed=TRUE; {k*_'0   
    } qa~[fORO[  
   } CL*%06QyE  
  } 9mnON~j5  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 |l|]Tw  
   for(int index=0;index<MAX_KEY;index++){ w-"&;klV  
    if(hCallWnd[index]==NULL) xki"'  
     continue; FX^E |  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) NLpD,q{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); G#V22Wca8  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 >H1d9y +Z  
   } s`B'vyoaa  
  } k Mo)4 Xp  
 } dF,FH-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 5^dw!^d  
} C;5}/J^E  
1fy{@j(W  
  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: UE4#j \  
pUr[MnQLf  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Y'5ck(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); LZVO9e]  
GCKl [<9*  
  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: US|vYd}u+  
%)D7Dr  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fUL"fMoU  
{ f3>/6 C  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) wj^I1;lO  
 { w(j9[  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 = I(s7=Liu  
  SaveBmp(); 0- UeFy  
  return FALSE; {P-PH$ E-  
 } *LRGfk+h  
 …… //其它处理及默认处理 ^sKXn:)  
} l 3K8{HY  
nf4 P2<L!  
*K(xES! b  
  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。 1I`D$Xq~:  
.{ -yveE  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。  M9K).P=  
~30Wb9eL  
  二、编程步骤 C\^K6,m5  
I/aAx.q  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; _iu|*h1y  
rieQ&Jt"  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; }'W^Ki$  
| #Pc e  
  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; ]SL&x:/-  
76b7-Nj"  
  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; co3 ,8\N0  
)9r%% #  
  5、 添加代码,编译运行程序。 $<4Ar*i  
DBUwf1=qj  
三、程序代码 I[UA' ~f  
k%g xY% 0  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL J [ H?nX9  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) AG7}$O.  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ }dUC^04  
#if _MSC_VER > 1000 9pcf jx..  
#pragma once d_+8=nh3  
#endif // _MSC_VER > 1000 hYn'uL^~[  
#ifndef __AFXWIN_H__ 6bNW1]rD  
#error include 'stdafx.h' before including this file for PCH fn OkH  
#endif d_uy;-3  
#include "resource.h" // main symbols <k](s  
class CHookApp : public CWinApp 0EOX@;}  
{ q4i8Sp>  
 public: j6vZ{Fx;w  
  CHookApp(); {1aAm+  
  // Overrides #!jRY!2Vt  
  // ClassWizard generated virtual function overrides s vb4uvY  
  //{{AFX_VIRTUAL(CHookApp) Rda1X~-g  
 public: j>xVy]v=|  
  virtual BOOL InitInstance(); fWyDWU  
  virtual int ExitInstance(); 2.D!4+&  
  //}}AFX_VIRTUAL /8}+# h)[  
  //{{AFX_MSG(CHookApp) _oTT3[7P  
  // NOTE - the ClassWizard will add and remove member functions here. x\.i `ukx  
  // DO NOT EDIT what you see in these blocks of generated code ! U.U.\   
  //}}AFX_MSG es[5B* 5  
  DECLARE_MESSAGE_MAP() ^P/D8cXa4  
}; ?(q*U!=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); rx>Tc#g  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4i/q^;`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0>=)  
BOOL InitHotkey(); J&:W4\ m  
BOOL UnInit(); $ bNe0  
#endif \GvY`kt3  
i\;&CzC:  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. q7&yb.<KD.  
#include "stdafx.h" I#t9aR+&  
#include "hook.h" 93IOG{OAY  
#include <windowsx.h> 4AOS}@~W  
#ifdef _DEBUG M/a/H=J  
#define new DEBUG_NEW C;q}3c*L  
#undef THIS_FILE u)`|q_y+8  
static char THIS_FILE[] = __FILE__; :{:?D\%6  
#endif :ECK $Cu  
#define MAX_KEY 100 Q *]`t@ q  
#define CTRLBIT 0x04 ^HFU@/  
#define ALTBIT 0x02 IS2Ij  
#define SHIFTBIT 0x01 s~Wu0%])Q  
#pragma data_seg("shareddata") o:8S$F`O@  
HHOOK hHook =NULL; xd fvme[  
UINT nHookCount =0; -`dxx)x  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ZBR^[OXO  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 3>9dJx4I  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey tH,K\v`f  
static int KeyCount =0; ~,!hE&LE~  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift _8li4;F  
#pragma data_seg() Mc7<[a  
HINSTANCE hins; d]ZC8<`w  
void VerifyWindow(); *{dD'9Bg  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) d50IAa^p6J  
//{{AFX_MSG_MAP(CHookApp) b?] S&)"9  
// NOTE - the ClassWizard will add and remove mapping macros here. x_y>j)  
// DO NOT EDIT what you see in these blocks of generated code! I^O:5x> [l  
//}}AFX_MSG_MAP "1!.^<V*  
END_MESSAGE_MAP() wYQ1Z  
 K-5"#  
CHookApp::CHookApp() y- <PsP-I  
{ B:- KZuO  
 // TODO: add construction code here, <]Pix )  
 // Place all significant initialization in InitInstance ?PE1aB+{:  
}  df4^C->:  
>9tkx/J  
CHookApp theApp; Wytvs*\`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) t7oz9fSz=?  
{ rfXF 01I  
 BOOL bProcessed=FALSE; 9[p }.9/  
 if(HC_ACTION==nCode) ~I\r1Wj;  
 {  %*5g<5  
  if((lParam&0xc0000000)==0xc0000000){// Key up _"!{7e`Z  
   switch(wParam) (2S!$w%  
   { Gj7QG IKx  
    case VK_MENU: H]i+o6  
     MaskBits&=~ALTBIT; Iz?W tm }  
     break; ^dUfTG9{  
    case VK_CONTROL: t66f 7AR  
     MaskBits&=~CTRLBIT; F*4Qa  
     break; F0BOhlK  
    case VK_SHIFT: |T$a+lHMD  
     MaskBits&=~SHIFTBIT; eW"x%|/Q7  
     break; GATP  
    default: //judge the key and send message )| Vg/S  
     break; ;%rs{XO9  
   } TFJ{fLG  
   for(int index=0;index<MAX_KEY;index++){ oj^5G ]_ <  
    if(hCallWnd[index]==NULL) KSgQ:_u4}  
     continue; W -C0 YU1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C`)^~C_]`3  
    { N t>HztXd  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ZaRr2Z:!  
     bProcessed=TRUE; o >Rw}R  
    } C*{15!d:G  
   } ##`;Eh0a  
  } vN0L( B  
  else if((lParam&0xc000ffff)==1){ //Key down `FYtiv?G  
   switch(wParam) Ng."+&  
   { o^_W$4Fc  
    case VK_MENU: L^5&GcHP0  
     MaskBits|=ALTBIT; 1(:b{Bl  
     break; 3d#9Wyxs  
    case VK_CONTROL: @dE 3  
     MaskBits|=CTRLBIT; dS3>q<J*a  
     break; r\l3_t  
    case VK_SHIFT: e<L 9k}c  
     MaskBits|=SHIFTBIT; o]|oAN9  
     break; lrmt)BLoh  
    default: //judge the key and send message VRd:2uDS  
     break; Gh$y#0qr  
   } [L*[j.r7[  
   for(int index=0;index<MAX_KEY;index++) 3Y1TQ;i,wQ  
   { c<+g|@A#  
    if(hCallWnd[index]==NULL) r>@ B+Xi  
     continue; P,$ [|)[E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c ?p0#3%L#  
    { 1%SJ1oY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [NCXn>Z  
     bProcessed=TRUE;  +eDN,iv  
    } }j5R@I6P  
   } /\,_P  
  } {p#l!P/  
  if(!bProcessed){ K)9j je  
   for(int index=0;index<MAX_KEY;index++){ taWirq d9  
    if(hCallWnd[index]==NULL) 8"?Vcw&  
     continue; rSF;Lp)}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) m0%iw1OsH%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); r{R[[]p  
   } w!B,kqTG  
  }  r21?c|IP  
 } M73VeV3DL  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); D% v:PYf  
} FhY{;-W(T  
]Efh(Gb]  
BOOL InitHotkey() %2@ Tj}xa  
{ :>tF_6  
 if(hHook!=NULL){ S|{Yvyp  
  nHookCount++; *c~'0|r  
  return TRUE; KD,^*FkkL  
 } 3xmiX{1e  
 else r%Q8)nEo  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); hkmTpH1<M  
  if(hHook!=NULL) r+[#%%}ea  
   nHookCount++; ="5k\1W1M  
  return (hHook!=NULL); abTDa6 /`v  
} |aI|yq)  
BOOL UnInit() g33<qYxP  
{ 4DQ07w  
 if(nHookCount>1){ bK_0NrXP  
  nHookCount--; ' D)1ka.  
  return TRUE; ; d, JN  
 } KA|&Q<<{@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 27Kc -rcB  
 if(unhooked==TRUE){ |MOn0 *  
  nHookCount=0; 3t"~F%4-}  
  hHook=NULL; nR,Qm=;  
 } <O,'5+zG%  
 return unhooked; RMS.1:O  
} 3JlC/v#0  
4f{[*6 GX  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4cXAT9  
{ b[J-ja.  
 BOOL bAdded=FALSE; }|Hw0zP.  
 for(int index=0;index<MAX_KEY;index++){ 8Ehy9<  
  if(hCallWnd[index]==0){ G?Qe"4 .  
   hCallWnd[index]=hWnd; ]Wy^VcqX  
   HotKey[index]=cKey; ql{^"8x  
   HotKeyMask[index]=cMask; =R8f)UQYx  
   bAdded=TRUE; (ZE%tbm2  
   KeyCount++; $Q`yNEc  
   break; -,K*~ z.l  
  } 4 o3)*  
 } 6T^N!3p_  
 return bAdded; oJlN.Q#u&  
} m+D2hK*  
.;<7424(%  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1zb$5{,|  
{ 7%:??*"~  
 BOOL bRemoved=FALSE; Qq`3S>  
 for(int index=0;index<MAX_KEY;index++){ NDB*BmG  
  if(hCallWnd[index]==hWnd){ bjM-Hd/K  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ K?h[.`}  
    hCallWnd[index]=NULL; (,- 5(fW  
    HotKey[index]=0; 2k.S[?)  
    HotKeyMask[index]=0; cOzg/~\1  
    bRemoved=TRUE; *fxep08B  
    KeyCount--; q*HAIw[<y  
    break; lEO?kn.:z  
   } S2koXg(  
  } p&k 0Rx0Q3  
 }  'P@=/  
 return bRemoved; ucQezmie  
} G*)s%2c>h  
(A7T}znG  
void VerifyWindow() *)j@G:  
{ (/T +Wpy?  
 for(int i=0;i<MAX_KEY;i++){ Nf=C?`L  
  if(hCallWnd!=NULL){ )x$!K[=  
   if(!IsWindow(hCallWnd)){ ,3wI~ j=  
    hCallWnd=NULL; #rhVzN-?)W  
    HotKey=0; 2LCc  
    HotKeyMask=0; &M0o&C-1/  
    KeyCount--; pd=7^"[};  
   } N; rXl8  
  } b*lKT]D,  
 } C$KaT3I  
} N+*(Y5TU  
G[|3^O>P  
BOOL CHookApp::InitInstance() =ied}a :[  
{ I?f"<5[0  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1P5*wNF  
 hins=AfxGetInstanceHandle(); ~GNyE*t/Y  
 InitHotkey(); GYFgEg}  
 return CWinApp::InitInstance(); .[edln  
} pO\ S#GnX  
re7!p(W?,  
int CHookApp::ExitInstance() b0r,h)R  
{ Ro$j1Aw(  
 VerifyWindow(); 8lMZ  
 UnInit(); EwTS!gL  
 return CWinApp::ExitInstance(); b2a'KczV  
} G i$  
+ckMT3  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file slu$2-H  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) r`?&m3IOP  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ b0y-H/d/}  
#if _MSC_VER > 1000 G!AICcP^  
#pragma once  =Ov9Kf  
#endif // _MSC_VER > 1000 %0NLRfp  
;])I>BT[  
class CCaptureDlg : public CDialog dz8-):  
{ Bfbl#ZkyL  
 // Construction x*:n4FZ7b  
 public: P1dN32H o  
  BOOL bTray; 8&i;hZm  
  BOOL bRegistered; gs$3)t  
  BOOL RegisterHotkey(); _Mlhum t  
  UCHAR cKey; x2Ha&   
  UCHAR cMask; jeY4yM  
  void DeleteIcon(); FL59  
  void AddIcon(); RwUW;hU  
  UINT nCount; wUbmzP.  
  void SaveBmp(); wh9L(0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor H( MB5  
  // Dialog Data #X4LLS]VV  
  //{{AFX_DATA(CCaptureDlg) !$xzA X,  
  enum { IDD = IDD_CAPTURE_DIALOG }; LOe4c0C6Ca  
  CComboBox m_Key; ,xYg  
  BOOL m_bControl; 55LgBD  
  BOOL m_bAlt; @=CLeQG`  
  BOOL m_bShift; $Xf~# uH  
  CString m_Path; &q.)2o#Q.  
  CString m_Number; O ,l\e 3;  
  //}}AFX_DATA &u&2D$K,tp  
  // ClassWizard generated virtual function overrides  }K?F7cD  
  //{{AFX_VIRTUAL(CCaptureDlg) `hzd|GmX  
 public: 2K Pqu:lv  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 'zE: fLo  
 protected: F/)f,sZF  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support KUbJe)}g  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); K/DH / r  
  //}}AFX_VIRTUAL XnD0eua#  
  // Implementation 5Qb;2!  
 protected: Pv#KmSA9  
  HICON m_hIcon; 6s'[{Ov  
  // Generated message map functions 7Ez}k}aR<  
  //{{AFX_MSG(CCaptureDlg) GM:, CJ?  
  virtual BOOL OnInitDialog(); 4>l0V<  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); &/HoSj>HS  
  afx_msg void OnPaint(); bS,etd  
  afx_msg HCURSOR OnQueryDragIcon();  KvGbDG  
  virtual void OnCancel(); ~'(9?81d  
  afx_msg void OnAbout(); yz2(_@R  
  afx_msg void OnBrowse(); ? %93b ,7  
  afx_msg void OnChange(); (WJV.GcP1  
 //}}AFX_MSG n>n"{!  
 DECLARE_MESSAGE_MAP() EVWA\RO'\  
}; {K+.A 9!  
#endif se!g4XEWD  
YRXK@'[=  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file L+Eu d  
#include "stdafx.h" 9w zwY[{  
#include "Capture.h" !`Le`c  
#include "CaptureDlg.h" CK=ARh#|  
#include <windowsx.h> Vfb<o"BQk  
#pragma comment(lib,"hook.lib") @?m+Z"o|z  
#ifdef _DEBUG `nKJR'QC  
#define new DEBUG_NEW D$ej+s7  
#undef THIS_FILE OqtQA#uL  
static char THIS_FILE[] = __FILE__; )q^(T1  
#endif 0Qt~K#mr/  
#define IDM_SHELL WM_USER+1 iW'_R{)T  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #T[%6(QW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); L+7*NaPY*  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 7$K}qsr<  
class CAboutDlg : public CDialog R \ia6  
{ iEe#aO"D!  
 public: iFSJ4 W(  
  CAboutDlg(); a"k'm}hVY$  
  // Dialog Data |"_)zQ  
  //{{AFX_DATA(CAboutDlg) )x)gHY8;  
  enum { IDD = IDD_ABOUTBOX }; !W(`<d]68:  
  //}}AFX_DATA a`s/qi  
  // ClassWizard generated virtual function overrides =ydpU<aS  
  //{{AFX_VIRTUAL(CAboutDlg) <W?WUF  
 protected: 7O"hiDQ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &h\7^=s.  
  //}}AFX_VIRTUAL _O LI%o  
  // Implementation yk`)Cq%=;  
 protected: 3\]~!;dI  
  //{{AFX_MSG(CAboutDlg) XYMxG:  
  //}}AFX_MSG FQ1arUOFW,  
  DECLARE_MESSAGE_MAP()  Ll?g.z"  
}; vABXXB  
>C:If0S4X  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) EPv%LX_j  
{ b1 H7  
 //{{AFX_DATA_INIT(CAboutDlg) Nvhy3  
 //}}AFX_DATA_INIT =88t*dH(,"  
} 3Mur*tj#  
ERp{gB2U?  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) (V8?,G>  
{ %TDXF_.[  
 CDialog::DoDataExchange(pDX); J,9%%S8/C  
 //{{AFX_DATA_MAP(CAboutDlg) ;|;iCaD a+  
 //}}AFX_DATA_MAP (ZS/@He  
} wz h.$?~  
fwy"w  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Q4=|@|U0  
 //{{AFX_MSG_MAP(CAboutDlg) ;sCU [4  
 // No message handlers *{Yh6 {  
 //}}AFX_MSG_MAP Hl/7(FJqc>  
END_MESSAGE_MAP() zs0hXxTY:  
zPHy2H$28  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) [#>{4qY2  
: CDialog(CCaptureDlg::IDD, pParent) W\%q} q2?  
{ ZzT&$J7]`{  
 //{{AFX_DATA_INIT(CCaptureDlg) I'?6~Sn3  
  m_bControl = FALSE; =E!x~S;N  
  m_bAlt = FALSE; {!MVc<G.  
  m_bShift = FALSE; an.`dBm  
  m_Path = _T("c:\\"); oCbpK  
  m_Number = _T("0 picture captured."); I=o'+>az  
  nCount=0; jx'2N~$  
  bRegistered=FALSE; V'C-'Ythwf  
  bTray=FALSE; vcwK6G  
 //}}AFX_DATA_INIT HZ{n&iJ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ,2ME2@OP  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); fy`+Efuj  
} puA |NT  
cFDxjX?~  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 8!;$qVt  
{ ZJ9x6|q  
 CDialog::DoDataExchange(pDX); Ox~ 9_d  
 //{{AFX_DATA_MAP(CCaptureDlg) l0. FiO@_Q  
  DDX_Control(pDX, IDC_KEY, m_Key); # 3.\j"b  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); IqNpLh|[  
  DDX_Check(pDX, IDC_ALT, m_bAlt); rpSr^slr  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); l^ Rm0t_  
  DDX_Text(pDX, IDC_PATH, m_Path); m9woredS,  
  DDX_Text(pDX, IDC_NUMBER, m_Number); >gnF]<  
 //}}AFX_DATA_MAP qfa}3k8et  
} W"|mpxp  
8?kP*tmcZ  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) j3{HkcjJG  
//{{AFX_MSG_MAP(CCaptureDlg) Vha'e3 o!  
 ON_WM_SYSCOMMAND() 4T%cTH:.9N  
 ON_WM_PAINT() 8<{;=m8cQ  
 ON_WM_QUERYDRAGICON() 5a6VMqQ6  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) *<xrp*O  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2uEhOi0I  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +2Z#M  
//}}AFX_MSG_MAP YNk|+A.<d  
END_MESSAGE_MAP() Ch7Egz l7?  
]Z/R!y?l"G  
BOOL CCaptureDlg::OnInitDialog() "9ue76  
{ @+:4J_N  
 CDialog::OnInitDialog(); /'\;8A$J`  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); %Ci^*zb  
 ASSERT(IDM_ABOUTBOX < 0xF000); d@Q][7  
 CMenu* pSysMenu = GetSystemMenu(FALSE); WcU@~05b  
 if (pSysMenu != NULL) QkL@JF]Re  
 { @iRO7 6m  
  CString strAboutMenu; ol<lCp  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ~$Y|ca  
  if (!strAboutMenu.IsEmpty()) GkciA{  
  { 3p&jLFphL  
   pSysMenu->AppendMenu(MF_SEPARATOR); ||XIWKF<n2  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); nEyI t&> 9  
  } SY|Ez!tU:N  
 } VAs ( .y  
 SetIcon(m_hIcon, TRUE); // Set big icon d/lffNS=  
 SetIcon(m_hIcon, FALSE); // Set small icon z&>|*C.Y  
 m_Key.SetCurSel(0); 5uttv:@=  
 RegisterHotkey(); 'bPk'pj9  
 CMenu* pMenu=GetSystemMenu(FALSE); wFb@1ae\  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 2f^-~dz  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +9C;<f  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ;y OD  
 return TRUE; // return TRUE unless you set the focus to a control M J\r 4n  
} +sRP<as  
`s%QeAde  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) / gu3@@h  
{ 'in@9XO  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) kW +G1|  
 { ).Gd1pE  
  CAboutDlg dlgAbout; O_AGMW/2+  
  dlgAbout.DoModal(); $kl$D"*0  
 } h R~v  
 else @hsbq  
 { x2m]Us@LIU  
  CDialog::OnSysCommand(nID, lParam); LipxAE?O  
 } &[~[~m|  
} `.8UKSH+  
V^2-_V]8  
void CCaptureDlg::OnPaint() Um\0i;7 ~4  
{ 8U=A{{0p  
 if (IsIconic()) o:9$UV[  
 { B2(,~^39  
  CPaintDC dc(this); // device context for painting 3S;N(A4  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); cix36MR_  
  // Center icon in client rectangle f?maa5S  
  int cxIcon = GetSystemMetrics(SM_CXICON); (u9Zk~)F  
  int cyIcon = GetSystemMetrics(SM_CYICON); :XYy7xz<  
  CRect rect; JGgxAd{L  
  GetClientRect(&rect); ?:/|d\,7@  
  int x = (rect.Width() - cxIcon + 1) / 2; <m]wi7  
  int y = (rect.Height() - cyIcon + 1) / 2; S=PJhAF  
  // Draw the icon W&KM/9d  
  dc.DrawIcon(x, y, m_hIcon); S(w\ZC  
 } )x[HuIRaa  
 else -TS? fne)  
 { bE4HDq34  
  CDialog::OnPaint(); AerFgQiS  
 } 0D~=SekQ 9  
} ZF'HM@cfo  
'F7VM?HBfg  
HCURSOR CCaptureDlg::OnQueryDragIcon() %t[K36,p  
{ )$_,?*fq:  
 return (HCURSOR) m_hIcon; )*D'csGc  
} +v-LL*fa  
|!}wF}iLc)  
void CCaptureDlg::OnCancel() pX_b6%yX(  
{ F~R7~ZE  
 if(bTray) 7kd|K b(  
  DeleteIcon(); >|nt2  
  CDialog::OnCancel(); V.2[ F|P;3  
} CL1 ;Inzl  
Ag6uR(uI  
void CCaptureDlg::OnAbout() uLK(F B  
{ zmbZ  
 CAboutDlg dlg; a:}E& ,&M  
 dlg.DoModal(); ?wCs&tM  
} |[LE9Lq/  
Y&GuDLUF  
void CCaptureDlg::OnBrowse() ,C:o`fQ\  
{ I N_gF_@%  
 CString str; C{&)(#*L  
 BROWSEINFO bi; K'Spbn!nC  
 char name[MAX_PATH]; Ue!Q."  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); #8UseK  
 bi.hwndOwner=GetSafeHwnd(); u]bz42]  
 bi.pszDisplayName=name; LS6ry,D"7  
 bi.lpszTitle="Select folder"; 8t[t{"  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; d.cCbr:  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <+q$XL0  
 if(idl==NULL) enumK\  
  return; |^ iA6)Q  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); P^zy;Qs7  
 str.ReleaseBuffer(); A{(T'/~"  
 m_Path=str; 41}/w3Z4  
 if(str.GetAt(str.GetLength()-1)!='\\') )E-E0Hl>7  
  m_Path+="\\"; YxyG\J\|,  
 UpdateData(FALSE); ANb"oX c  
} n_P(k-^U*  
}p{;^B  
void CCaptureDlg::SaveBmp() *8UYSA~v  
{ yoU2AMH2D^  
 CDC dc; OoM_q/oI  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); c[:Wf<% |  
 CBitmap bm; !g2a|g   
 int Width=GetSystemMetrics(SM_CXSCREEN); = UUd8,C/  
 int Height=GetSystemMetrics(SM_CYSCREEN); Ux_<d?p  
 bm.CreateCompatibleBitmap(&dc,Width,Height); GX5W^//}  
 CDC tdc; `xIh\q  
 tdc.CreateCompatibleDC(&dc); tW(+xu36  
 CBitmap*pOld=tdc.SelectObject(&bm); )eq}MaW+j  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); `Cg^in\  
 tdc.SelectObject(pOld); !tBeuemN%  
 BITMAP btm; rKp1%S1  
 bm.GetBitmap(&btm); &CUC{t$VHX  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 0'@u!m?  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); >?V<$>12  
 BITMAPINFOHEADER bih; 7&#m]t^ ^  
 bih.biBitCount=btm.bmBitsPixel; ]QS](BbD:  
 bih.biClrImportant=0; L#ZLawG  
 bih.biClrUsed=0; PG"@A  
 bih.biCompression=0; =ybGb7?  
 bih.biHeight=btm.bmHeight; zX~}]?|9  
 bih.biPlanes=1; WW6yFriuW  
 bih.biSize=sizeof(BITMAPINFOHEADER); ~S;!T  
 bih.biSizeImage=size; Lzz) n%y5  
 bih.biWidth=btm.bmWidth; !0Nf9  
 bih.biXPelsPerMeter=0; Mj'lASI  
 bih.biYPelsPerMeter=0; HamEIL-l.  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 4#h ?Wga  
 static int filecount=0; ; 8E;  
 CString name; G_+Ph^  
 name.Format("pict%04d.bmp",filecount++); .[,6JU%  
 name=m_Path+name; S.hC$0vrj  
 BITMAPFILEHEADER bfh; <I 1y  
 bfh.bfReserved1=bfh.bfReserved2=0; 045\i[l=  
 bfh.bfType=((WORD)('M'<< 8)|'B'); n;qz^HXEJ  
 bfh.bfSize=54+size; !-RwB@\  
 bfh.bfOffBits=54; a2X h>{  
 CFile bf; zAI|Jv @  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ b^Z$hnh]S  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); OpqNEo\  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); N8 M'0i?  
  bf.WriteHuge(lpData,size); *%?d\8d  
  bf.Close(); Cya5*U0=  
  nCount++; Mciq-c)  
 } Y }/c N\  
 GlobalFreePtr(lpData); gVA; `<  
 if(nCount==1) r{Z[xWIX  
  m_Number.Format("%d picture captured.",nCount); SB1[jcJ  
 else ]>vf9]  
  m_Number.Format("%d pictures captured.",nCount); 6ZOAmH fs  
  UpdateData(FALSE); T<M?PlED  
} z5pc3:  
~<eVl l=  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) oAnigu;  
{ K7Gm-=%  
 if(pMsg -> message == WM_KEYDOWN) }9=2g`2Q  
 { F"=Hp4-C  
  if(pMsg -> wParam == VK_ESCAPE) Yw[{beo  
   return TRUE; "uhV|Lk*7  
  if(pMsg -> wParam == VK_RETURN) h>|u:]I>  
   return TRUE; ]v GgJ<  
 } @?d?e+B  
 return CDialog::PreTranslateMessage(pMsg); LfllO  
} (Y)!"_|  
Y'JL(~|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) pZ\$50t&O  
{ \gd6Yx^[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 3&9zGy{V+  
  SaveBmp(); RpAiU  
  return FALSE; C Oa.xyp  
} ^Xa*lR 3  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ O%VA)<  
 CMenu pop; 'z-D%sCA  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); h"8QeX:((  
 CMenu*pMenu=pop.GetSubMenu(0); VWD.J  
 pMenu->SetDefaultItem(ID_EXITICON); CrO`=\  
 CPoint pt; ]hKgA~;  
 GetCursorPos(&pt); )2]a8JVf  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); RF!'K ko  
 if(id==ID_EXITICON) ZYDW v/u  
  DeleteIcon(); ]<+3Vw  
 else if(id==ID_EXIT) e2bLkb3c  
  OnCancel(); %Zu Ll(  
 return FALSE; (Xj.iP  
} hv{87`L'K(  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); pX^=be_  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) K9*IA@xL  
 AddIcon(); u{P~zyx  
 return res; ,02w@we5  
} (JU_8j!  
W]@6=OpH  
void CCaptureDlg::AddIcon() )^";BVY  
{ (M8h y4Ex  
 NOTIFYICONDATA data; Mlwdha0  
 data.cbSize=sizeof(NOTIFYICONDATA); Wz5=(<{S  
 CString tip; q- H&5K  
 tip.LoadString(IDS_ICONTIP); Y-= /,   
 data.hIcon=GetIcon(0); w#<p^CS  
 data.hWnd=GetSafeHwnd(); egWx9xX  
 strcpy(data.szTip,tip); :~i+tD  
 data.uCallbackMessage=IDM_SHELL; ]'e A O  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; KD=bkZ&  
 data.uID=98; iU XM( ]  
 Shell_NotifyIcon(NIM_ADD,&data); k{1b20  
 ShowWindow(SW_HIDE); aH  
 bTray=TRUE; kJ__:rS(T_  
} I5Q~T5Ar  
5v+L';wx[T  
void CCaptureDlg::DeleteIcon() <uC<GDO  
{ ~ttKI4  
 NOTIFYICONDATA data; VW~Xbyf  
 data.cbSize=sizeof(NOTIFYICONDATA); VRB~7\A5<)  
 data.hWnd=GetSafeHwnd(); x RB7lV*  
 data.uID=98; ozuIwzi7N  
 Shell_NotifyIcon(NIM_DELETE,&data); j<@fT ewZ  
 ShowWindow(SW_SHOW); W.p66IQwL&  
 SetForegroundWindow(); U&s(1~e\  
 ShowWindow(SW_SHOWNORMAL); );!dg\U  
 bTray=FALSE; `^zQ$au'u  
} FTbtAlqh<  
}|,EU!nDi  
void CCaptureDlg::OnChange() 6$DG.p  
{ xh`Du|jvm  
 RegisterHotkey(); _\!0t  
} '(XW$D  
4Lw'v:(  
BOOL CCaptureDlg::RegisterHotkey() x.o3iN[=  
{ C6CGj8G  
 UpdateData(); w~n kNqm  
 UCHAR mask=0; BPqwDj W  
 UCHAR key=0; YY\Rua/nG  
 if(m_bControl) I0(8Z]x  
  mask|=4; a 1NCVZ  
 if(m_bAlt) C?S~L5a#oC  
  mask|=2; u,\xok"  
 if(m_bShift) (c<f<D|  
  mask|=1; xp(mB7;:  
  key=Key_Table[m_Key.GetCurSel()]; HI z9s4Y_  
 if(bRegistered){ $CM4&{B"i  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); M",];h(I6(  
  bRegistered=FALSE; 1-/4Y5?}  
 } Y6+k9$h  
 cMask=mask; N:d D*[QZ  
 cKey=key; PJ}[D.elO  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); \k4M{h6  
 return bRegistered; tfsh!)u?  
} &`m~o/  
%Dl_}  
  四、小结 ti+pUlVrM  
-;f+; M  
  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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