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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: ofV0L  
  Ba8=nGa4KY  
  一、实现方法 /nQuM05*Z  
6"* <0  
  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: OQ hQ!6  
#jW-&a  
#pragma data_seg("shareddata") I2WP/  
HHOOK hHook =NULL; //钩子句柄 TDDMx |{  
UINT nHookCount =0; //挂接的程序数目 yy=hCjQ)  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 } LS8q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 4h@,hY1#  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey }n4 T!N  
static int KeyCount =0; lbda/Zx  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 UjQz   
#pragma data_seg() (g@\QdH`|  
mdEJ'];AH  
  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。 0|Fx Sc  
x C&IR*  
  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: zplv.cf#q  
RB+Jp  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Hvm}@3F|  
cKey,UCHAR cMask) h;jO7+W  
{ "H[K3  
 BOOL bAdded=FALSE; Sp5:R75vI  
 for(int index=0;index<MAX_KEY;index++){ Pd~=:4  
  if(hCallWnd[index]==0){ zp;!HP;/=  
   hCallWnd[index]=hWnd; +FqD.=8  
   HotKey[index]=cKey; (T#$0RFq  
   HotKeyMask[index]=cMask; qisvGHo  
   bAdded=TRUE; kZz'&xdv'.  
   KeyCount++; {WrEe7dLy  
   break; I{cH$jt<  
  } K 77iv  
 } i`2SebDj'w  
 return bAdded; c%/b*nQ(=  
} \L(cFjLIl  
//删除热键 P-Y_$Nv0g  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  C7ivA h  
{ *^|\#UIk  
 BOOL bRemoved=FALSE; ?d-w#<AiV  
 for(int index=0;index<MAX_KEY;index++){ BA: x*(%~  
  if(hCallWnd[index]==hWnd){ ESRj<p%W  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &~P4yI;,  
    hCallWnd[index]=NULL; #j~FlY5  
    HotKey[index]=0; }8x+F2i  
    HotKeyMask[index]=0; NS z }  
    bRemoved=TRUE; iibG$?(  
    KeyCount--; cDY)QUmi  
    break; Sc[#]2 }  
   } s) ]j X  
  } qX-ptsQ  
 } tJ6@Ot  
 return bRemoved; J;>epM ;*  
} CVa>5 vt  
d#0:U Y%~  
z9ADF(J?0'  
  DLL中的钩子函数如下: dR]-R/1|  
kP%hgZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) T06(Q[)  
{ Q 84t=  
 BOOL bProcessed=FALSE; D8wf`RUt  
 if(HC_ACTION==nCode) W]oD(eZ  
 { ae sk.  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 a ~v$ bNu  
   switch(wParam) G^ W0!u,@  
   {  89LD:+p/  
    case VK_MENU: X!Z)V)@J8  
     MaskBits&=~ALTBIT; {oqbV#/&  
     break; gPKf8{#%e  
    case VK_CONTROL: r& a[ ?  
     MaskBits&=~CTRLBIT; Pz2 b  
     break; wu.l-VmGp)  
    case VK_SHIFT: %i9 e<.Ot  
     MaskBits&=~SHIFTBIT; |MZ1j(_  
     break; 1p. c6[9 -  
    default: //judge the key and send message QgqJ #  
     break; l e'RU1k  
   } NbU`_^oC  
   for(int index=0;index<MAX_KEY;index++){ w1)TnGT  
    if(hCallWnd[index]==NULL) 2L](4Q[M  
     continue; (lM,'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X 61|:E  
    { 9S|sTf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [nO3%7t@  
     bProcessed=TRUE; $K^l=X  
    } L?[m$l!T}  
   } o%?)};o  
  } @-)?uYw:r  
  else if((lParam&0xc000ffff)==1){ //有键按下 ^y/Es2A#t  
   switch(wParam) {1Ra |,;  
   { (+|+ELfqW  
    case VK_MENU: ?@G s7'  
     MaskBits|=ALTBIT; /^.S nqk  
     break;  8${n}}  
    case VK_CONTROL:  1c0' i  
     MaskBits|=CTRLBIT; X,v.1#[  
     break; f=l/Fp}4UH  
    case VK_SHIFT: +^Xf:r` G  
     MaskBits|=SHIFTBIT; TRm#H $  
     break; 'Bue*  
    default: //judge the key and send message h:8P9WhWF  
     break; N55F5  
   } :VT%d{Vp_  
   for(int index=0;index<MAX_KEY;index++){ uB  I/3aQ  
    if(hCallWnd[index]==NULL) g{]6*`/Z  
     continue; "u^Erj# /  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'v]0;~\mp>  
    { $NVVurXa  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); AZ3T#f![L@  
     bProcessed=TRUE; .|O T#"LP  
    } '8;bc@cE  
   } xvOz*vM?  
  } 0V~zZ/e  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 64?HqO 6(  
   for(int index=0;index<MAX_KEY;index++){ TGF$zvd  
    if(hCallWnd[index]==NULL) [K3 te  
     continue; ev$:7}h=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) F\D iT|?}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); dun`/QKV  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 U*C^g}iA  
   } J 8%gC  
  } r/sSkF F  
 } 2#.s{Bv  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %P0  
} 12Oa_6<\0;  
m%[e_eS  
  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: 1cK'B<5">]  
*K|~]r(F?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); u}nSdZC  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >_2~uF@pb  
n&:ohOH%  
  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: n*7^lAa2  
+c~&o83[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zTa5 N  
{ x:FZEyalG  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) /"Vd( K2Z  
 { XjN4EDi+E  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 B"_O!  
  SaveBmp(); 2GptK"MrD  
  return FALSE; v?VDASR2`  
 } >Q/;0>V  
 …… //其它处理及默认处理 1#=9DD$4  
} h <4`|Bg+  
'OA*aQ=K  
X}Oe'y  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 "QnYT3[l"  
H'k}/<%Q  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 \n[kzi7  
Y$ jX  
  二、编程步骤 I<#X#_YP  
+Hu\b&g  
  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"; G3DgB!  
ov_l)vt  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; G`FYEmD  
I}_}VSG(  
  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; p]mN)  
j0e,>X8  
  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; kkjugm{D7  
E2dM0r<]  
  5、 添加代码,编译运行程序。 Z^|N]Ej  
s\;/U|P_  
三、程序代码 Tgz=I4g  
@R5^J{T  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL e\V -L_  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) \U$:/#1Oe  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ v[Q)L!J1  
#if _MSC_VER > 1000 _Tj&gyS  
#pragma once O>h`  
#endif // _MSC_VER > 1000 4Fft[S(  
#ifndef __AFXWIN_H__ ]Ucw&B* @  
#error include 'stdafx.h' before including this file for PCH 8* A%k1+  
#endif X)KCk2Ax  
#include "resource.h" // main symbols /JS_gr@DK  
class CHookApp : public CWinApp S9Sgd&a9  
{ .P 1WY  
 public: @5^&&4>N  
  CHookApp(); ^)-[g  
  // Overrides w-n}&f  
  // ClassWizard generated virtual function overrides <MbhBIejr  
  //{{AFX_VIRTUAL(CHookApp) ,ucRQ&P  
 public: e#*3X4<\K  
  virtual BOOL InitInstance(); (xb2H~WrN  
  virtual int ExitInstance(); hWy@?r.  
  //}}AFX_VIRTUAL +cH>'OXoB  
  //{{AFX_MSG(CHookApp) n<C] 6H  
  // NOTE - the ClassWizard will add and remove member functions here. <L]Gk]k_R  
  // DO NOT EDIT what you see in these blocks of generated code ! ?0; 2ct  
  //}}AFX_MSG R,BJr y  
  DECLARE_MESSAGE_MAP() Z[nHo'  
}; (,h2qP-;ud  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); w1tM !4r  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b=5w>*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3Z?ornS  
BOOL InitHotkey(); J9[7AiEd(/  
BOOL UnInit(); ;].X;Ky <  
#endif E:K4k <  
$9X+dvu*  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. D|ceZ <9x  
#include "stdafx.h" Eiu/p&ct  
#include "hook.h" 2K9X (th1  
#include <windowsx.h> r!&174DSR1  
#ifdef _DEBUG B@(d5i{h  
#define new DEBUG_NEW _Q1p_sdg  
#undef THIS_FILE ^4fvV\ne_~  
static char THIS_FILE[] = __FILE__; &x1A {j_  
#endif c-k3<|H`  
#define MAX_KEY 100 M 2hZ'  
#define CTRLBIT 0x04 un 5r9  
#define ALTBIT 0x02 A`uHZCwJ5  
#define SHIFTBIT 0x01 r &.~ {  
#pragma data_seg("shareddata") T_S3_-|{==  
HHOOK hHook =NULL; v*!N}1+J  
UINT nHookCount =0; +;~N; BT  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey "s0,9; }  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 6Hnez@d  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Dz0D ^(;V  
static int KeyCount =0; !`e`4y*N  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 5!?5S$>  
#pragma data_seg() |#_p0yPy  
HINSTANCE hins; w x]?D%l  
void VerifyWindow(); ;<M}ZL@m  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Ikdj?"+O  
//{{AFX_MSG_MAP(CHookApp) Z+v,o1  
// NOTE - the ClassWizard will add and remove mapping macros here. gk|>E[.  
// DO NOT EDIT what you see in these blocks of generated code! oJ4HvrUO  
//}}AFX_MSG_MAP KM;H '~PZi  
END_MESSAGE_MAP() ,1{qZ(l1  
jc"sPrv5  
CHookApp::CHookApp() (}39f  
{ a>OYJe  
 // TODO: add construction code here,  4v`/~a  
 // Place all significant initialization in InitInstance xS1|t};  
} Po)U!5Tm  
;0Z-  
CHookApp theApp; 5[4wN( )  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) qHub+"2  
{ _|u}^MLO  
 BOOL bProcessed=FALSE; AJ}FHym_ZQ  
 if(HC_ACTION==nCode) Ca'BE#q  
 { ~pZ0B#K J  
  if((lParam&0xc0000000)==0xc0000000){// Key up &{? M} 2I  
   switch(wParam) dNgA C){w  
   { kU/MvoV  
    case VK_MENU: Nud =K'P=  
     MaskBits&=~ALTBIT; 1\fx57a\  
     break; Sh(ys*y>  
    case VK_CONTROL: }>6e-]MHfR  
     MaskBits&=~CTRLBIT; rC!O}(4t%$  
     break; VFf;|PHS  
    case VK_SHIFT: M)#9Q=<  
     MaskBits&=~SHIFTBIT; qob!AU|  
     break; OWibmX  
    default: //judge the key and send message ms0V1`  
     break; _]zX W  
   } tM]Gu?6  
   for(int index=0;index<MAX_KEY;index++){ 3JGrJ!x  
    if(hCallWnd[index]==NULL) D\_nqx9O  
     continue; v ;\cM/&5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  BI?, 3  
    { bN/8 ~!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); R>0[w$  
     bProcessed=TRUE; W^8  
    } d` ttWWPw  
   } Zp7Pw   
  } ?XY'<]o E  
  else if((lParam&0xc000ffff)==1){ //Key down KdkL_GSLT  
   switch(wParam) U3N d\b'0  
   { )pl5nu#<  
    case VK_MENU: y7>3hfn~w  
     MaskBits|=ALTBIT; >1`4]%  
     break; LL e*| :  
    case VK_CONTROL: p/ (Z2N"  
     MaskBits|=CTRLBIT; #$Zx].[lc  
     break; p?L%'  
    case VK_SHIFT: (e'8>Pv  
     MaskBits|=SHIFTBIT; _\4#I(  
     break; :2KHiT5  
    default: //judge the key and send message =H)]HxEEM  
     break; d'96$e o~  
   } trDw|WA  
   for(int index=0;index<MAX_KEY;index++) !Wr<T!T  
   { uZL]mwkj]  
    if(hCallWnd[index]==NULL) 4m< ]qw  
     continue;  skl3/!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =x -7 Wy  
    { JlnmG<WLT  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  a[nSUlT&  
     bProcessed=TRUE; F:m6Mf7L  
    } D=^&?@k<  
   } =Smd/'`_  
  } {j$2=0Cec  
  if(!bProcessed){ i975)_X(  
   for(int index=0;index<MAX_KEY;index++){ y!1X3X,V  
    if(hCallWnd[index]==NULL) Jpduk&u  
     continue; UK,bfLPt~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?L0;, \-t  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -u@ ^P7  
   } ,mz;$z6i  
  } =W7-;&  
 } gfK_g)'2U  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +\Vw:~e  
} :j`f%Vg~x  
h"ZIh= j@  
BOOL InitHotkey() `R2Iw I&  
{ ?+EAp"{j  
 if(hHook!=NULL){ =J1V?x=l@  
  nHookCount++; p K-tj  
  return TRUE; }ex4dhx2M  
 } (W h)Ov"  
 else {Lal5E4-  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ;<0vvP|  
  if(hHook!=NULL) Q &W>h/  
   nHookCount++; 7R6B}B?/  
  return (hHook!=NULL); n5C,Z!)z  
} #Gi`s?  
BOOL UnInit() `T*Y1@FV  
{  x(HHy,  
 if(nHookCount>1){ cRs.@U\{R\  
  nHookCount--; </;e$fh`  
  return TRUE; .hH_1Mo8  
 } l1T`[2  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Y0g]-B  
 if(unhooked==TRUE){ 4}DFCF%B  
  nHookCount=0; _OG9wi(Fpx  
  hHook=NULL; )yyH_Ax2  
 } [lML^CYQ  
 return unhooked; a2.6 S./  
} LC]0c)v#  
/4(HVua  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =!L}/Dl  
{ }kt%dDU  
 BOOL bAdded=FALSE; P@@MQ[u?!.  
 for(int index=0;index<MAX_KEY;index++){ f#&z m} t  
  if(hCallWnd[index]==0){ }6^5mhsL  
   hCallWnd[index]=hWnd; L E\rc A  
   HotKey[index]=cKey; Tl yyJ{~  
   HotKeyMask[index]=cMask; ?<jWEz=  
   bAdded=TRUE; s3sRMB2  
   KeyCount++; \2; !}  
   break; iA{q$>{8  
  } *0" ojfVn  
 } s``a{ HZ  
 return bAdded; ]0T*#U/P  
} YD[AgToo0  
]*=!lfrV  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) KH)-=IJ8  
{ ?ja%*0 R  
 BOOL bRemoved=FALSE; o*A, 6y  
 for(int index=0;index<MAX_KEY;index++){ U+'zz#0qN  
  if(hCallWnd[index]==hWnd){ 0&)6mO  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Wi=zu[[qc  
    hCallWnd[index]=NULL; mTsyVji8  
    HotKey[index]=0; k~AtnI  
    HotKeyMask[index]=0; i ZPNss  
    bRemoved=TRUE; FbuWFC  
    KeyCount--; <5%*"v  
    break; 0V-jOc  
   } odca?  
  } jR}EBaI}  
 } Psf'^42(v  
 return bRemoved; B~]6[Z  
} $,:mq>]![{  
e 1XKlgl  
void VerifyWindow() tXA?[ S  
{ \dU.#^ryp  
 for(int i=0;i<MAX_KEY;i++){ 9IXy96]]6  
  if(hCallWnd!=NULL){ 8nBYP+t,e  
   if(!IsWindow(hCallWnd)){ A-1K TD  
    hCallWnd=NULL; z&0[F`U  
    HotKey=0; &Ih }"  
    HotKeyMask=0; <_8b AO8\  
    KeyCount--; )SP"V~^Wn  
   } g%= K rO  
  } fsPsP`|  
 } Q\s+w){f%  
} rD21:1s  
ShL!7y*rT{  
BOOL CHookApp::InitInstance() F(.`@OO  
{ dH5*%  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); hN K wQ  
 hins=AfxGetInstanceHandle(); 43h06X`  
 InitHotkey(); HqsqUS3[  
 return CWinApp::InitInstance(); cQ<|Of  
} 9 Vq   
;UXV!8SM  
int CHookApp::ExitInstance() h8O\sKn  
{ UH0l8ixc  
 VerifyWindow(); {,uSDI Oj$  
 UnInit(); 68GH$ji  
 return CWinApp::ExitInstance(); 0xDn!  
} I}u\ov_Su  
sg-^ oy*^  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file /-!Fr:Ox>  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) O)V;na  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ &8f/6dq  
#if _MSC_VER > 1000 h-"q <eY"  
#pragma once *=B<S/0  
#endif // _MSC_VER > 1000 e.L&A|  
4Ia'Yr  
class CCaptureDlg : public CDialog ,<+:xl   
{ } l+_KA  
 // Construction |LJv*  
 public: @TW:6v`  
  BOOL bTray; v&G9HiH  
  BOOL bRegistered; ,&3+w ~Ua  
  BOOL RegisterHotkey(); Y(`Bc8h  
  UCHAR cKey; *YH!L{y  
  UCHAR cMask; ):4)8@]5M  
  void DeleteIcon(); x`+M#A()/  
  void AddIcon(); 5"40{3  
  UINT nCount; \nP79F0%2  
  void SaveBmp(); o=94H7@  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor (rJ-S"^u  
  // Dialog Data 3}g>/F ~  
  //{{AFX_DATA(CCaptureDlg) ,F->*=  
  enum { IDD = IDD_CAPTURE_DIALOG }; 6 Q7MAP M  
  CComboBox m_Key; }@6yROy.  
  BOOL m_bControl; j<)$ [v6  
  BOOL m_bAlt; !nL94:8U  
  BOOL m_bShift; ?uc]Wgw"s  
  CString m_Path; 5l@} 1n  
  CString m_Number; [u*7( 4e  
  //}}AFX_DATA :j3^p8]  
  // ClassWizard generated virtual function overrides J ?aJa  
  //{{AFX_VIRTUAL(CCaptureDlg) > .}G[C  
 public: X} V]3  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ~0024B[G  
 protected:  Q'cWqr  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support h`! 4`eI  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); GGwwdB\x'  
  //}}AFX_VIRTUAL Yur}<>`(  
  // Implementation D@ sMCR  
 protected: 2\.23  
  HICON m_hIcon; $ #/8l58  
  // Generated message map functions rZ.=Lq  
  //{{AFX_MSG(CCaptureDlg) g,*fpk  
  virtual BOOL OnInitDialog(); +W1l9n*  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); dk1q9Tx  
  afx_msg void OnPaint(); nTsV>lQY,  
  afx_msg HCURSOR OnQueryDragIcon(); WxD$k3U  
  virtual void OnCancel(); `0W"[BY  
  afx_msg void OnAbout(); `lm'_~=`&  
  afx_msg void OnBrowse(); i@P= *lLD  
  afx_msg void OnChange(); "Ltp]nCR  
 //}}AFX_MSG &<#1G u_  
 DECLARE_MESSAGE_MAP() M@q)\UQ'  
}; $A74V [1^  
#endif kz1Z K  
qooTRqc#,  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file n&]J-^Tx  
#include "stdafx.h" Z>w@3$\z  
#include "Capture.h" :-+][ [  
#include "CaptureDlg.h" hC{2LLu;n  
#include <windowsx.h> q4@+Pi)  
#pragma comment(lib,"hook.lib") Bk.`G)t  
#ifdef _DEBUG l0yflFGr  
#define new DEBUG_NEW 9\Rk(dd  
#undef THIS_FILE wrCV&2CG  
static char THIS_FILE[] = __FILE__; <MO40MP  
#endif aB G*  
#define IDM_SHELL WM_USER+1 z,C>Rh9Id  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b; ;y|H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  `m_f i  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; S=< ]u  
class CAboutDlg : public CDialog LfrjC@_y  
{ w U]8hkl?  
 public: 8zeD%Uv  
  CAboutDlg(); V#1v5mWVx  
  // Dialog Data LM"b%  
  //{{AFX_DATA(CAboutDlg) j _E(h.  
  enum { IDD = IDD_ABOUTBOX }; N/0Q`cQ-  
  //}}AFX_DATA KVoi>?a   
  // ClassWizard generated virtual function overrides )i39'0a  
  //{{AFX_VIRTUAL(CAboutDlg) <;+QK=f  
 protected: Lrx"Hn{  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support RM2feWm  
  //}}AFX_VIRTUAL  wN0?~  
  // Implementation WV|9d}5  
 protected: YE"MtL {  
  //{{AFX_MSG(CAboutDlg) c7?|Tipc  
  //}}AFX_MSG RvVF^~u  
  DECLARE_MESSAGE_MAP() )086u8w )y  
}; bX`]<$dr3  
xU.Ymq& 5  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) aeLIs SEx  
{ S +73 /Vs  
 //{{AFX_DATA_INIT(CAboutDlg) bw#\"uJ  
 //}}AFX_DATA_INIT iu+H+_  
} ONcS,oHW  
-Vg0J6x  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) UU =,Brb  
{ pek5P4W_  
 CDialog::DoDataExchange(pDX); nM$-L.dG  
 //{{AFX_DATA_MAP(CAboutDlg) @M }`nKXM  
 //}}AFX_DATA_MAP u*Y!=IT  
} TSL/zTLDJ  
mp]UUpt  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) #eI` l`}  
 //{{AFX_MSG_MAP(CAboutDlg) +(q r{G?  
 // No message handlers ,qgR+]?({  
 //}}AFX_MSG_MAP 7BA9zs392  
END_MESSAGE_MAP() h7]>b'H  
5FNf)F   
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) p_3VFKq>0  
: CDialog(CCaptureDlg::IDD, pParent) 5bK:sht  
{ Zq}Cl'f  
 //{{AFX_DATA_INIT(CCaptureDlg) +w3k_^X9c  
  m_bControl = FALSE; $/JnYkL{m  
  m_bAlt = FALSE; U@:iN..  
  m_bShift = FALSE; BS3BJwf; f  
  m_Path = _T("c:\\"); T:j!a{_|  
  m_Number = _T("0 picture captured."); pHDPj,lu  
  nCount=0; uUpOa+t  
  bRegistered=FALSE; ~65lDFY/  
  bTray=FALSE; ]7dal [i  
 //}}AFX_DATA_INIT \l;H !y[  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 D>q?My  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;}4e+`fF|  
} 1\,wV,  
g5&,l  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) dI8y}EbE~  
{ f9E.X\"  
 CDialog::DoDataExchange(pDX); bzMs\rj\  
 //{{AFX_DATA_MAP(CCaptureDlg) "l09Ae'V  
  DDX_Control(pDX, IDC_KEY, m_Key); w+ibY  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); YC~kq?  
  DDX_Check(pDX, IDC_ALT, m_bAlt); p7)b@,  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); :}w^-I"  
  DDX_Text(pDX, IDC_PATH, m_Path); QN m.8c$  
  DDX_Text(pDX, IDC_NUMBER, m_Number); \?.M1a[  
 //}}AFX_DATA_MAP Uefw  
} obIYC  
h@ ?BA<'S  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) RE:$c!E!  
//{{AFX_MSG_MAP(CCaptureDlg) [@t 6,g  
 ON_WM_SYSCOMMAND() 3WdANR  
 ON_WM_PAINT() B7qiCX}pD  
 ON_WM_QUERYDRAGICON() lT]dj9l  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Ed~2Qr\65  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Rh#TR"  
 ON_BN_CLICKED(ID_CHANGE, OnChange) EabZ7zFoN  
//}}AFX_MSG_MAP +4p gPv  
END_MESSAGE_MAP() Vt," 5c  
I:#Es.  
BOOL CCaptureDlg::OnInitDialog() nR~L$Wu5_a  
{ (hX}O>  
 CDialog::OnInitDialog(); & 5YI!; q,  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); al\ R(\p|  
 ASSERT(IDM_ABOUTBOX < 0xF000); cvf#^Cu   
 CMenu* pSysMenu = GetSystemMenu(FALSE); S)\%.~ n  
 if (pSysMenu != NULL) ep"54o5=d  
 { C,m o4,Q  
  CString strAboutMenu; 4q5bW+$Xj  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?l<u%o  
  if (!strAboutMenu.IsEmpty()) n\y%5J+  
  {  hG!"e4  
   pSysMenu->AppendMenu(MF_SEPARATOR); ((%g\&D  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ^t\AB)(8  
  } rRZ ,X%  
 } sh"\ kk9  
 SetIcon(m_hIcon, TRUE); // Set big icon 2L_ts=  
 SetIcon(m_hIcon, FALSE); // Set small icon bMw)> 4  
 m_Key.SetCurSel(0); lTv_%hUp  
 RegisterHotkey(); DV/P/1E  
 CMenu* pMenu=GetSystemMenu(FALSE); $.@)4Nu!_  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Ea*Jl<  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); N^. !l_  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); rx#\Dc}  
 return TRUE; // return TRUE unless you set the focus to a control ojitBo~  
} q y8=4~40  
Ge;plD-f  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) U= PG0  
{ >m{)shBX  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX)  HRKe 7#e  
 { 3E361?ubM  
  CAboutDlg dlgAbout; Z*|qbu)  
  dlgAbout.DoModal(); v2Bks 2  
 } r'q9N  
 else ,2%>e"%  
 { )rs);Pl  
  CDialog::OnSysCommand(nID, lParam); ~T[m{8uh  
 } AcYL3  
} v(t?d  
hQfxz,X  
void CCaptureDlg::OnPaint() Q pY:L  
{ $fY4amX6Z  
 if (IsIconic()) rX#} 2  
 { 5sq#bvfJ o  
  CPaintDC dc(this); // device context for painting f13%[RA9N  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); vF K&.J  
  // Center icon in client rectangle z<jWy$Ta;  
  int cxIcon = GetSystemMetrics(SM_CXICON); vF=d`T<  
  int cyIcon = GetSystemMetrics(SM_CYICON); NY ZPh%x  
  CRect rect; 89'XOXl&1  
  GetClientRect(&rect); )S|}de/a2  
  int x = (rect.Width() - cxIcon + 1) / 2; bewi.$E{  
  int y = (rect.Height() - cyIcon + 1) / 2; 1qb 3.  
  // Draw the icon F3b[L^Km]  
  dc.DrawIcon(x, y, m_hIcon); Bk 1Q.Un  
 } .Go3'$'v  
 else 9)QvJ87e@7  
 { V< @]Iv  
  CDialog::OnPaint(); |:tFQ.Z'2  
 } h2Z Gh  
} iCIu]6  
z rt8ze=Su  
HCURSOR CCaptureDlg::OnQueryDragIcon() a-,BBM8|  
{ @"H+QVJ@  
 return (HCURSOR) m_hIcon; P~:W+!@5v  
} '+ |{4-V  
4 |N&Y  
void CCaptureDlg::OnCancel() $N=A,S  
{ G~e`O,+  
 if(bTray) c]W]m`:  
  DeleteIcon(); \+g95|[/  
  CDialog::OnCancel(); C``%<)WC  
} #kV`G.EX  
W&6P%0G/  
void CCaptureDlg::OnAbout() B" wk:\zC  
{ UGPD5wX?  
 CAboutDlg dlg; |YQ:4'^"  
 dlg.DoModal(); VWG#v #o  
} %9=^#e+pE  
Au" [2cG  
void CCaptureDlg::OnBrowse() x 1$tS#lS  
{ mD)_quz.sk  
 CString str; oZ@_o3VG  
 BROWSEINFO bi; Y2w 9]:J  
 char name[MAX_PATH]; M*E4:A9_M  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); r$6z{Na\[  
 bi.hwndOwner=GetSafeHwnd(); %u43Pj  
 bi.pszDisplayName=name; >"S'R9t  
 bi.lpszTitle="Select folder"; `{/z\  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; fdN-Zq@'  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); HT5G HkT  
 if(idl==NULL) ])a?ri  
  return; ]RQQg,|D  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); A[ZJS   
 str.ReleaseBuffer(); _#e='~;  
 m_Path=str; bI=\n)sEz  
 if(str.GetAt(str.GetLength()-1)!='\\') z1F[okLA  
  m_Path+="\\"; S~ }?6/G.  
 UpdateData(FALSE); &S<tX]v  
} Vrf` :%  
d;(L@9HHD  
void CCaptureDlg::SaveBmp() Ni{ (=&*=  
{ PS@` =Z  
 CDC dc; |]]Xee]  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Zi2NgVF  
 CBitmap bm; C 9,p-  
 int Width=GetSystemMetrics(SM_CXSCREEN);  vu  YH+  
 int Height=GetSystemMetrics(SM_CYSCREEN); u /cL[_Q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ^&DHBx"J  
 CDC tdc; %n9}P , ?  
 tdc.CreateCompatibleDC(&dc); r+>E`GGQ  
 CBitmap*pOld=tdc.SelectObject(&bm); KC? hsID{  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); [cru+c+O:  
 tdc.SelectObject(pOld); =[?2'riI  
 BITMAP btm; 'e\m6~u\hm  
 bm.GetBitmap(&btm); 3U@ p  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; oWo"` "P  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); xue-5 '  
 BITMAPINFOHEADER bih; f 7et  
 bih.biBitCount=btm.bmBitsPixel; ?U2ed)zzw  
 bih.biClrImportant=0; }jfU qqFd  
 bih.biClrUsed=0; MlsF?"H p  
 bih.biCompression=0; 9 YU7R)  
 bih.biHeight=btm.bmHeight; 7 4aap2^  
 bih.biPlanes=1; $[[6N0}*:  
 bih.biSize=sizeof(BITMAPINFOHEADER); or ~o'  
 bih.biSizeImage=size; B.K"1o  
 bih.biWidth=btm.bmWidth; VE6T&fz`  
 bih.biXPelsPerMeter=0; yK0Q,   
 bih.biYPelsPerMeter=0; EUe2<G  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); D_9&=a a'  
 static int filecount=0; =6j  5,  
 CString name; 91%+Bf()J6  
 name.Format("pict%04d.bmp",filecount++); q[1H=+  
 name=m_Path+name; 1U~AupHE  
 BITMAPFILEHEADER bfh; -Z<e`iFQS  
 bfh.bfReserved1=bfh.bfReserved2=0; n@5pS3qZ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ]<4Yor}t{;  
 bfh.bfSize=54+size; /[GOs*{zB  
 bfh.bfOffBits=54; f3V&i)w(  
 CFile bf; sxO_K^eD  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ rNqJL_!  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); nV McHN   
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); HQaKG4Z  
  bf.WriteHuge(lpData,size); [lQp4xgxi  
  bf.Close(); ,ye>D='  
  nCount++; %g0"Kj5  
 } HHCsWe-  
 GlobalFreePtr(lpData); Fx0K.Q2Y0  
 if(nCount==1) 8b(UqyV  
  m_Number.Format("%d picture captured.",nCount); ;MCv  
 else dj?.Hc7od  
  m_Number.Format("%d pictures captured.",nCount); u-pE ;|  
  UpdateData(FALSE); A86#7  
} |>A1J:  
u$&7fmZ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) aAwnkQ$  
{ }o=R7n%  
 if(pMsg -> message == WM_KEYDOWN) Gc4N)oq)}b  
 { =@binTC4  
  if(pMsg -> wParam == VK_ESCAPE) cIja^xD  
   return TRUE; %6L!JN  
  if(pMsg -> wParam == VK_RETURN)  ~ceGx  
   return TRUE; gJ c5Y  
 } mv SNKS  
 return CDialog::PreTranslateMessage(pMsg); KHcf P7  
} ^P:9iu)+]~  
`\q4z-<-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) j"_V+)SD  
{ p."pI Bd  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Zj~tUCc  
  SaveBmp(); T {(6*^g<B  
  return FALSE; ?O\n!c  
} 6VQ*z8wLw  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =35EG{W(  
 CMenu pop; #TZYe4#f  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 8_Y{7;<ey  
 CMenu*pMenu=pop.GetSubMenu(0); {TzKHnP  
 pMenu->SetDefaultItem(ID_EXITICON); ]J;^< 4l  
 CPoint pt; Y$Js5K@F  
 GetCursorPos(&pt); #g{ZfO[#  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); KTBsH;6  
 if(id==ID_EXITICON) [ #A!B#`  
  DeleteIcon(); 6N~~:Gt  
 else if(id==ID_EXIT) yXppu[=  
  OnCancel(); x nWapG  
 return FALSE; OjE wJ$$  
} /_x?PiL  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); bW3e*O$V  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) q' 3=  
 AddIcon(); *FK!^Y  
 return res; Z?XE~6aP>  
} vj[ .`fY  
$62ospR^Y  
void CCaptureDlg::AddIcon() 9j:?s;B  
{ He)v:AH  
 NOTIFYICONDATA data; bX|Z||img  
 data.cbSize=sizeof(NOTIFYICONDATA); ~e~4S~{  
 CString tip; D>?%p"e  
 tip.LoadString(IDS_ICONTIP); lp!@uoN^T  
 data.hIcon=GetIcon(0); #2_phm'  
 data.hWnd=GetSafeHwnd(); Q++lgVh)E  
 strcpy(data.szTip,tip); {G%`K,T  
 data.uCallbackMessage=IDM_SHELL; 1xL2f&bG  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; RQ9fA1YP  
 data.uID=98; JT[|l-\zo  
 Shell_NotifyIcon(NIM_ADD,&data); '<>pz<c  
 ShowWindow(SW_HIDE); _s|C0Pt  
 bTray=TRUE; ~hE"B) e  
} V_Wv(G0-\  
`-]*Qb+  
void CCaptureDlg::DeleteIcon() f@[q# }6  
{ ]*%0CDY6`N  
 NOTIFYICONDATA data; wcsUb 9(  
 data.cbSize=sizeof(NOTIFYICONDATA); 'Xxt[Jy  
 data.hWnd=GetSafeHwnd(); ,hT t]w  
 data.uID=98; KNQX\-=  
 Shell_NotifyIcon(NIM_DELETE,&data); b0 PF7PEEQ  
 ShowWindow(SW_SHOW); {]Nvq9?  
 SetForegroundWindow(); x}AWWmXv  
 ShowWindow(SW_SHOWNORMAL); y*vs}G'W  
 bTray=FALSE; HS="t3  
} TN.mNl%  
1 q}iUnR  
void CCaptureDlg::OnChange() tP"C >#LO  
{ zK k;&y|{  
 RegisterHotkey(); k~`pV/6  
} `L]cJ0tAs  
rzLpVpTaz  
BOOL CCaptureDlg::RegisterHotkey() Y71io^td~j  
{ *]W{83rXQ  
 UpdateData(); w/~,mzM"  
 UCHAR mask=0; #If}P$!  
 UCHAR key=0; dF5EIPl;J  
 if(m_bControl) TW{.qed8^  
  mask|=4; HB||'gIC  
 if(m_bAlt) \P^WUWY  
  mask|=2; eqZ V/a  
 if(m_bShift) c,!Ijn\;(  
  mask|=1; ]A5FN4 E  
  key=Key_Table[m_Key.GetCurSel()]; $*H_0wQc  
 if(bRegistered){ pLDseEr<  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); x`WP*a7Fk]  
  bRegistered=FALSE; x: `oqbd  
 } P`@d8 %*;  
 cMask=mask; ;&s`g   
 cKey=key; ?E^~z-  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ;R@zf1UYA  
 return bRegistered; "n}J6   
} )ra_`Qdcf  
QO[!  
  四、小结 rt_%_f>qd  
|XtN\9V.  
  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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