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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: :Ro" 0/d  
  !+26a*P  
  一、实现方法 $P}]|/Yb  
S bqM=I+  
  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: p~zTRnm  
pfn#~gC_=  
#pragma data_seg("shareddata") R7;rBEt8  
HHOOK hHook =NULL; //钩子句柄 [{!j9E?(  
UINT nHookCount =0; //挂接的程序数目 $E@.G1T [  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 s"Pk-Dv  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 i\R\bv[9  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey m&jt[   
static int KeyCount =0; 63dtO{:4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 e !x-:F#4j  
#pragma data_seg() Vi -!E  
CH_Dat >  
  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。 g}og@UY7#  
eq 1 4  
  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: n YMf[kW  
BHBT=,sI  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR BMsy}08dQ  
cKey,UCHAR cMask) Q_|S^hx Q  
{ $8ww]}K  
 BOOL bAdded=FALSE; Q\>SF  
 for(int index=0;index<MAX_KEY;index++){ SVEA  
  if(hCallWnd[index]==0){ ]=XL9MI  
   hCallWnd[index]=hWnd; \U  =>  
   HotKey[index]=cKey; ,xM*hN3A  
   HotKeyMask[index]=cMask; IhKas4  
   bAdded=TRUE; ~Wd8>a{w  
   KeyCount++; `[u>NEb  
   break; SE-, 1p  
  } ScmzbDu  
 } 52R.L9Ai  
 return bAdded; (V%vFD1)  
} ?@BaBU:o`F  
//删除热键 d1_*!LW$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -OGy-"  
{ l8Iy 03H  
 BOOL bRemoved=FALSE; r\- k/0  
 for(int index=0;index<MAX_KEY;index++){ Ox1QP2t6Y  
  if(hCallWnd[index]==hWnd){ &XTd[_VW!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $W]guG  
    hCallWnd[index]=NULL; H4",r5qw:  
    HotKey[index]=0; qBrZg  
    HotKeyMask[index]=0; JWjp<{Q; 1  
    bRemoved=TRUE; i]WlMC6  
    KeyCount--; z`{zqP:  
    break; weadY,-H8  
   } XQ y|t"Vq>  
  } n& &U9sf?  
 } X(q=,^Mp  
 return bRemoved; P[K T  
} WC;a  
3sIM7WD?  
&8L\FAY0%9  
  DLL中的钩子函数如下: &!fcLJd  
dp W%LXM_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) eTHh  
{ JNCtsfd  
 BOOL bProcessed=FALSE; p arG  
 if(HC_ACTION==nCode) *%+buHe  
 { OvG|=  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 \`# 0,pLr  
   switch(wParam) 2{: J1'pC  
   {  .[ s82c]]6  
    case VK_MENU: T<GD!j(  
     MaskBits&=~ALTBIT; >&z+ih  
     break; bncFrzp#o  
    case VK_CONTROL: IcA~f@  
     MaskBits&=~CTRLBIT; ZJM^P'r.1c  
     break; o:*iT =l  
    case VK_SHIFT: [p<[83' ]  
     MaskBits&=~SHIFTBIT; ay[*b_f  
     break; Lwk-  
    default: //judge the key and send message @b({QM|  
     break; 1yc@q8  
   } .q}k  
   for(int index=0;index<MAX_KEY;index++){ yt,;^o^  
    if(hCallWnd[index]==NULL) (LPD  
     continue; YNk|UwJi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >*CK@"o  
    { pSUp"wch  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); I/|n ma/ $  
     bProcessed=TRUE; 4+bsG6i  
    } @U5>w\  
   } C =U4|h~W  
  } 3Re\ T  
  else if((lParam&0xc000ffff)==1){ //有键按下 X|G+N(`|(  
   switch(wParam) 5)6%D  
   { ;O>fy :$'  
    case VK_MENU: 5,Zn$zosJC  
     MaskBits|=ALTBIT; X:/t>0e  
     break; P2F>iK#U  
    case VK_CONTROL: G$<0_0GF  
     MaskBits|=CTRLBIT; Y.#+Yh[  
     break; *h6i9V%'  
    case VK_SHIFT: 1A`";E&  
     MaskBits|=SHIFTBIT; (0f^Hh wF  
     break; iq -o$6Pg  
    default: //judge the key and send message ?>&Zm$5V  
     break; s6uAF(4,  
   } Cn '=_1p  
   for(int index=0;index<MAX_KEY;index++){ U7?ez  
    if(hCallWnd[index]==NULL) pXa? Q@ 6  
     continue; N3) v,S-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~G:7*:[b  
    { cw{[B%vw  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); | &vuK9q  
     bProcessed=TRUE; fO nvC*  
    } ;wrgpP3  
   } O1,[7F.4g  
  } 37Y]sJrs$  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 |e >-v  
   for(int index=0;index<MAX_KEY;index++){ pM3BBF%  
    if(hCallWnd[index]==NULL) 2oLa`33c1  
     continue; |&7,g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) oJ:J'$W(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); = ;d<Ikj  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 L4b4X  
   } g!ww;_  
  } cK&oC$[r-  
 } = @o}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Q2Rj0E`  
} b??1Up  
(P-<9y@  
  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: zdE^v{}|  
/+msrrpD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |e\%pfZ   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Lw`\J|%p  
ej+!|97M  
  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: X$f%Ss  
6* 7&X#gG  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) (6nw8vQ  
{ L_,U*Jyo  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) *b EsWeP  
 { "RLb wm~  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 'S" F=)*-  
  SaveBmp(); }T,uw8?f!  
  return FALSE; v &n &i?  
 }  s25012  
 …… //其它处理及默认处理 Fm "$W^H  
} Npqbxb  
MXb(Z9)]kw  
Bh?;\D'YC  
  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。 @zbXG_J  
00i9yC8@6  
  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。 .FUE F)  
0*)79Sz  
  二、编程步骤 \!r^6'A   
;QYK {3R?  
  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"; KVuv%?  
^;a[v^&9  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; q`P:PRgM  
r`2& 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; 5 S 1m&s5k  
H|Ems}b  
  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; o&]qjFo\m  
wrbDbp1L  
  5、 添加代码,编译运行程序。 V;"'!dVX  
Q*I/mUP&f  
三、程序代码 utr_fFu  
bm;4NA?Gg  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ;c`B '  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) QUt!fF@t  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ F}X_I  
#if _MSC_VER > 1000 =["GnL*!0  
#pragma once mWh:,[o  
#endif // _MSC_VER > 1000 S'txY\  
#ifndef __AFXWIN_H__ 1 !sYd@iD@  
#error include 'stdafx.h' before including this file for PCH /W9=7&R0  
#endif FB@G.f  
#include "resource.h" // main symbols 5J,vH  
class CHookApp : public CWinApp \m<*3eS  
{ IY'S<)vOY  
 public: rZLMY M  
  CHookApp(); +mJAIjH  
  // Overrides >_@J&vC  
  // ClassWizard generated virtual function overrides FW2} 9#R  
  //{{AFX_VIRTUAL(CHookApp) OHU(?TBo  
 public: >a<;)K^1  
  virtual BOOL InitInstance(); \?j(U8mB>  
  virtual int ExitInstance(); *d=pK*g  
  //}}AFX_VIRTUAL @c.pOX[]m,  
  //{{AFX_MSG(CHookApp) %lBFj/B  
  // NOTE - the ClassWizard will add and remove member functions here. }{$@|6)R   
  // DO NOT EDIT what you see in these blocks of generated code ! HkrNt/]  
  //}}AFX_MSG N67m=wRx  
  DECLARE_MESSAGE_MAP() 8g3 6-8  
}; gY%-0@g  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); )lZb=t  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %EuSP0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `!i>fo~  
BOOL InitHotkey(); <*L8kNykK  
BOOL UnInit(); E:2Or~  
#endif k20tn ew  
n'SnqJ&}  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. $3So`8Bm[$  
#include "stdafx.h" ^Kn}{m/3Y  
#include "hook.h" hQ9VcS6=gD  
#include <windowsx.h> j:0z/gHp$  
#ifdef _DEBUG ` sSI;+  
#define new DEBUG_NEW k]Yd4CC2  
#undef THIS_FILE q N>j2~  
static char THIS_FILE[] = __FILE__; *p"%cas  
#endif % 74}H8q_z  
#define MAX_KEY 100 k3&Wv  
#define CTRLBIT 0x04 \n}cx~j  
#define ALTBIT 0x02 [,VD^\  
#define SHIFTBIT 0x01 |g~.]2az  
#pragma data_seg("shareddata") nkxVc  
HHOOK hHook =NULL; zJPzI{-w|  
UINT nHookCount =0; \QVL%,.%M  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 8{AzB8xp  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 'Ag?#vB  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey G=DRz F  
static int KeyCount =0; 8IO4>CMkv  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift "_lSw3  
#pragma data_seg() ?Pa5skqR  
HINSTANCE hins; I'JFt>]  
void VerifyWindow(); `U(FdT  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) kxh $R>  
//{{AFX_MSG_MAP(CHookApp) KcHW>IBxdv  
// NOTE - the ClassWizard will add and remove mapping macros here. yovC~  
// DO NOT EDIT what you see in these blocks of generated code! 2TdcZ<k}J  
//}}AFX_MSG_MAP cf96z|^C  
END_MESSAGE_MAP() J=  T!  
 W+e  
CHookApp::CHookApp() ikUG`F%W  
{ 8< R#}  
 // TODO: add construction code here, W_%Dg]l   
 // Place all significant initialization in InitInstance 6:H@= fEv  
} %5'6^bT  
tks1*I$S<  
CHookApp theApp; &4LrV+`$V  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) yTv#T(of  
{ L:7%Wdyh  
 BOOL bProcessed=FALSE; 3{CXIS  
 if(HC_ACTION==nCode) p~qdkA<  
 { MFRM M%`  
  if((lParam&0xc0000000)==0xc0000000){// Key up }}<^f M  
   switch(wParam) s$A|>TOY  
   { +ps(9O/B>  
    case VK_MENU: 1jDN=hIl  
     MaskBits&=~ALTBIT; /@:I\&{f'9  
     break; [&51m^  
    case VK_CONTROL: m)V%l0  
     MaskBits&=~CTRLBIT; ^I7iEv  
     break; arm26YA-,  
    case VK_SHIFT: X-=49)  
     MaskBits&=~SHIFTBIT; fTMn  
     break; EW]rD  
    default: //judge the key and send message U 1vZ r{\  
     break; b:2# 3;)  
   } N^v"n*M0|  
   for(int index=0;index<MAX_KEY;index++){ ?|kwYA$4o  
    if(hCallWnd[index]==NULL) C h>r.OfP  
     continue; )m|)cLT&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f]Xh7m(Gh  
    { UZz/v#y~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `f S$@{YI_  
     bProcessed=TRUE; ]@0C1 r  
    } )1N~-VuT  
   } Dr)B0]KG  
  } ',P$m&z  
  else if((lParam&0xc000ffff)==1){ //Key down OQ&l/|{O0?  
   switch(wParam) 0.+MlyA  
   { G .NGS%v  
    case VK_MENU: ZwM(H[iqL  
     MaskBits|=ALTBIT; \I (g70  
     break; ;X, A|m$(  
    case VK_CONTROL: 1aDx 6Mq  
     MaskBits|=CTRLBIT; 4}`z^P<C  
     break; Qhy!:\&1  
    case VK_SHIFT: 5<YV`T{5Kl  
     MaskBits|=SHIFTBIT; yvv]iRk<  
     break; O |!cPB:  
    default: //judge the key and send message k..AP<hH  
     break; }20~5!  
   } uVN2}3!)Y  
   for(int index=0;index<MAX_KEY;index++) f?W_/daP  
   {  4 Fl>XM  
    if(hCallWnd[index]==NULL) ]Q$Sei5  
     continue; }p5_JXBV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Kl_(4kQE_  
    { 3$G &~A{  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); g8k S}7/  
     bProcessed=TRUE; zncKd{Q\tP  
    } u.;l=tzz  
   } VkFMr8@|  
  } cDS \=Bf  
  if(!bProcessed){ 52ExRG S  
   for(int index=0;index<MAX_KEY;index++){ 0Xb,ne 7  
    if(hCallWnd[index]==NULL) 2ci[L:U  
     continue; z.lIlp2:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =U'!<w<-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9k /L m  
   } AO, o|,#4F  
  } S#kYPe  
 } s@zO`uBc  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (1 (~r"4I  
} 7>"dc+Fg  
/g$G G9  
BOOL InitHotkey() L>LIN 1A  
{ U$|q]N  
 if(hHook!=NULL){ e.\dqt~%y  
  nHookCount++; <p/zm}?')  
  return TRUE; DG?g~{Y~b  
 } -U*J5Q  
 else Qo32oT[DM  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ,BUrZA2\U$  
  if(hHook!=NULL) 1oe,>\\  
   nHookCount++; >dx/k)~~-L  
  return (hHook!=NULL); `*6|2  
} [;H-HpBaa  
BOOL UnInit() kM J}sS  
{ IdqCk0lVD  
 if(nHookCount>1){ j"K^zh  
  nHookCount--; C#-HWoSi  
  return TRUE; }{y)a<`  
 } _B>'07D0  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ^"<x4e9+j  
 if(unhooked==TRUE){ oqAO@<dL!  
  nHookCount=0;  & .0A%  
  hHook=NULL; E;}&2 a  
 } )(0if0D4  
 return unhooked; }`kiULC'=  
} A'BqNsy  
{n|ah{_p|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "AU.Eh"-1  
{ nNq<x^@83  
 BOOL bAdded=FALSE; l`.z^+!8@  
 for(int index=0;index<MAX_KEY;index++){ D&i\dgbK  
  if(hCallWnd[index]==0){ FQJiLb._Z  
   hCallWnd[index]=hWnd; %N)B8A9kh  
   HotKey[index]=cKey; To}eJ$8*5  
   HotKeyMask[index]=cMask; SIapY%)h  
   bAdded=TRUE; f"RC(("6W  
   KeyCount++; yX4 Vv{g  
   break; 58XZ]Mc0  
  } " i:[|7  
 } q>Di|5<y  
 return bAdded; GF6o  
} b{qN7X~>  
"MU-&**  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <pfl>Uf  
{ +: x[cK  
 BOOL bRemoved=FALSE; EjL]#,QR  
 for(int index=0;index<MAX_KEY;index++){ f-3CDUQ`  
  if(hCallWnd[index]==hWnd){ fGb}V'x}r  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ md*U  
    hCallWnd[index]=NULL; ,VS(4  
    HotKey[index]=0; i,h30J  
    HotKeyMask[index]=0; ULqI]k(  
    bRemoved=TRUE;  4d\^  
    KeyCount--; eT+i &  
    break; _aR{B-E  
   } ulxfxfd  
  } WW+xU0  
 } -=nk,cYn  
 return bRemoved; jB8Q% {%  
} ||JUP}eP  
4XNheP;b  
void VerifyWindow()  tPQ|znB|  
{ r[4n2Mys  
 for(int i=0;i<MAX_KEY;i++){ ~4khIz  
  if(hCallWnd!=NULL){ kN.;;HFq#  
   if(!IsWindow(hCallWnd)){ }%p:Xv@X!  
    hCallWnd=NULL; I% u 2 ce  
    HotKey=0; "Yh;3tI4*  
    HotKeyMask=0; GQ;0KIN  
    KeyCount--; 8'u9R~})   
   } h*%FZ}}`q  
  }  D3cJIVM  
 } o>_})WM1[  
} rw,Ylr :3  
])wdd>'  
BOOL CHookApp::InitInstance() [a04( 2g  
{ `p&[b]b  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); >*RU:X  
 hins=AfxGetInstanceHandle(); /kY9z~l  
 InitHotkey(); db~^Gqv6k  
 return CWinApp::InitInstance(); 5>I-? Ki  
} JcWp14~e  
4d`YZNvZW/  
int CHookApp::ExitInstance() &J)<1!|  
{ _;B wP  
 VerifyWindow(); 1(-!TJ{  
 UnInit(); pASX-rb  
 return CWinApp::ExitInstance(); ;.V/ngaj  
} .JPN';  
IplOXD  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *Jgi=,!m  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 8 MQq3  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ M@R"-$Z  
#if _MSC_VER > 1000 G9f6'5 O  
#pragma once Ea&|kO|  
#endif // _MSC_VER > 1000 A#. %7S  
xIGq+yd(  
class CCaptureDlg : public CDialog pR$(V4>  
{ D`T;j[SsS#  
 // Construction  !BsQJ_H  
 public: ~Jk& !IE2  
  BOOL bTray; ,B[j{sE  
  BOOL bRegistered; tw_o?9  
  BOOL RegisterHotkey(); /?eVWCR  
  UCHAR cKey; iM@$uD$_Q2  
  UCHAR cMask; q#tUDxf(|  
  void DeleteIcon(); 5p (zhfuG  
  void AddIcon(); _K o#36.S  
  UINT nCount; dymq Z<  
  void SaveBmp(); .\ ;'>qy  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor UJL2IF-x  
  // Dialog Data 1uAjy(y  
  //{{AFX_DATA(CCaptureDlg) (-gomn  
  enum { IDD = IDD_CAPTURE_DIALOG }; h^SWb9 1"G  
  CComboBox m_Key; `gX|q3K\s  
  BOOL m_bControl; D5,]E`jwu  
  BOOL m_bAlt; #7i*Diqf9  
  BOOL m_bShift; )i~AXBt}  
  CString m_Path; iApq!u,  
  CString m_Number; & Q3Fgj  
  //}}AFX_DATA ,AP0*Ln  
  // ClassWizard generated virtual function overrides jVQy{8{G  
  //{{AFX_VIRTUAL(CCaptureDlg) IMkE~0x4</  
 public: }|.<EkA  
  virtual BOOL PreTranslateMessage(MSG* pMsg); r[S(VPo[()  
 protected: G:<f(Gy  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support cLV*5?gVO  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); <E2 IU~e  
  //}}AFX_VIRTUAL g&s. 0+  
  // Implementation X`.##S KC  
 protected:  k,:W]KD  
  HICON m_hIcon; l~i?  
  // Generated message map functions %L=e%E=m  
  //{{AFX_MSG(CCaptureDlg) l =E86"m  
  virtual BOOL OnInitDialog(); Q;]JVT1  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 3`bQ0-D;  
  afx_msg void OnPaint(); ;P91'B~t  
  afx_msg HCURSOR OnQueryDragIcon(); {7o3wxsS  
  virtual void OnCancel(); P8eCaZg?(3  
  afx_msg void OnAbout(); YvJFZ_faX  
  afx_msg void OnBrowse(); #EH=tJgO|J  
  afx_msg void OnChange(); .PB!1C.}@  
 //}}AFX_MSG iXDG-_K  
 DECLARE_MESSAGE_MAP() 9{u=  
}; F7DA~G!  
#endif DpRMXo[  
W_W!v&@E=  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file NiZfaC6V  
#include "stdafx.h" MTu\T  
#include "Capture.h" Sq5,}oT_{j  
#include "CaptureDlg.h" \Y4(+t=4  
#include <windowsx.h> B[N]=V  
#pragma comment(lib,"hook.lib") ~/L:$  
#ifdef _DEBUG (!* l+}  
#define new DEBUG_NEW *ERV\/  
#undef THIS_FILE "t0^4=c+7  
static char THIS_FILE[] = __FILE__; zjmo IE  
#endif Va8 }JD  
#define IDM_SHELL WM_USER+1 t%:7W[_s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Uu_qy(4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ui'v ' $  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Rw?w7?I  
class CAboutDlg : public CDialog zG9FO/@av  
{ \ lbH   
 public: 0z>IYw|UB  
  CAboutDlg(); ]64Pk9z=  
  // Dialog Data tx09B)0  
  //{{AFX_DATA(CAboutDlg) ji/`OS-iq  
  enum { IDD = IDD_ABOUTBOX }; }F>RI jj  
  //}}AFX_DATA 2j-l<!s  
  // ClassWizard generated virtual function overrides A%^?z.  
  //{{AFX_VIRTUAL(CAboutDlg) pr<u 5  
 protected: Cj= R\@  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <f>77vh0  
  //}}AFX_VIRTUAL Y2L{oQ.C2  
  // Implementation ^T&{ORWz  
 protected: #:?:gY<  
  //{{AFX_MSG(CAboutDlg) P.Nt jz/B  
  //}}AFX_MSG hi(b\ ABx  
  DECLARE_MESSAGE_MAP() HhynU/36  
}; sPNm.W$_  
iHv+I~/  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) <V^o.4mOg>  
{ -b!?9T?}  
 //{{AFX_DATA_INIT(CAboutDlg) <WUgH6"  
 //}}AFX_DATA_INIT Zf$mwRS[_  
} K@p9_K8  
ja9u?UbW  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) -8)Hulo/{U  
{ KpGx<+0p  
 CDialog::DoDataExchange(pDX); JZ}zXv   
 //{{AFX_DATA_MAP(CAboutDlg) "mn?*  
 //}}AFX_DATA_MAP |eRE'Wd0  
} "}X+vd``  
!60U^\  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) H^'%$F?Ss  
 //{{AFX_MSG_MAP(CAboutDlg) Z` kVyuQ  
 // No message handlers g%J\YRo  
 //}}AFX_MSG_MAP OG{*:1EP  
END_MESSAGE_MAP() ! >F70  
Jj)J5 S /  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ,~3rY,y-  
: CDialog(CCaptureDlg::IDD, pParent) `%\CO `  
{ +s<6eHpm  
 //{{AFX_DATA_INIT(CCaptureDlg) `\@n&y[`7  
  m_bControl = FALSE; 9 m8KDB[N  
  m_bAlt = FALSE; Ys.GBSlHG  
  m_bShift = FALSE; W$X/8K bn  
  m_Path = _T("c:\\"); azFJ-0n@"  
  m_Number = _T("0 picture captured."); 0:Bpvl5  
  nCount=0; *SJ[~  
  bRegistered=FALSE; .$s']' =  
  bTray=FALSE; GLIY!BU<C  
 //}}AFX_DATA_INIT sSh." H  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9qDM0'WuU  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); r\QV%09R  
} v#gXXO[P1  
NU_^*@k  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ZklO9Ox(  
{ 8Dl(zYK;  
 CDialog::DoDataExchange(pDX); Y*#xo7#B  
 //{{AFX_DATA_MAP(CCaptureDlg) g}R#0gkdk}  
  DDX_Control(pDX, IDC_KEY, m_Key); rV\G/)xL  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); @_t=0Rc  
  DDX_Check(pDX, IDC_ALT, m_bAlt); [ PN2^  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); q0q-Coh>  
  DDX_Text(pDX, IDC_PATH, m_Path); oAifM1*0  
  DDX_Text(pDX, IDC_NUMBER, m_Number); onmpMU7w  
 //}}AFX_DATA_MAP =?W7OV^BE  
} xyo~p,(~t  
+@uA  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) j|8!gW  
//{{AFX_MSG_MAP(CCaptureDlg) y =sae  
 ON_WM_SYSCOMMAND() v6G1y[Wl  
 ON_WM_PAINT() :YRHO|  
 ON_WM_QUERYDRAGICON() NL:dyV }  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) &*o4~6pQ#  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) {Y/0BS2D  
 ON_BN_CLICKED(ID_CHANGE, OnChange)  #*rJI3  
//}}AFX_MSG_MAP #yIHr&'oX  
END_MESSAGE_MAP() u ]y[g  
PZru:.Mh  
BOOL CCaptureDlg::OnInitDialog() 7Cp /{l;d  
{ ]["%e9#aX  
 CDialog::OnInitDialog(); { k=3OIp  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); c|3oa"6T>  
 ASSERT(IDM_ABOUTBOX < 0xF000); iOIq2&sV  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 4<tbZP3/6)  
 if (pSysMenu != NULL) u[KxI9Q  
 { >VZxDJ$R  
  CString strAboutMenu; v .*fJ   
  strAboutMenu.LoadString(IDS_ABOUTBOX); $@kOMT  
  if (!strAboutMenu.IsEmpty()) phG *It}  
  { F3vywN1$,  
   pSysMenu->AppendMenu(MF_SEPARATOR); 0'f\>4B  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); OmkJP  
  } +5I5  
 } G11KAq(  
 SetIcon(m_hIcon, TRUE); // Set big icon YJ6:O{AL1  
 SetIcon(m_hIcon, FALSE); // Set small icon wEq&O|Vj  
 m_Key.SetCurSel(0); E$z-|-{>  
 RegisterHotkey(); PSv 5tQhm  
 CMenu* pMenu=GetSystemMenu(FALSE); @"h4S*U  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); iVnMn1h  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); dh%O {t  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); y+Nw>\|S  
 return TRUE; // return TRUE unless you set the focus to a control b00$3,L   
} EdqB4-#7  
_t"[p_llo  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) A`M-N<T  
{ :FU?vh$)  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) @i> r(X  
 { Z3MhHvvgp{  
  CAboutDlg dlgAbout; F5+F O^3E  
  dlgAbout.DoModal(); }D!tB  
 } .fqy[qrM  
 else L'a+1O1q&i  
 { oCE'@}s.i  
  CDialog::OnSysCommand(nID, lParam); h}'Hst  
 } Q=%W-  
} $bKXP(  
E@otV6Wk[@  
void CCaptureDlg::OnPaint() |AE{rvP{@  
{ @D*PO-s9  
 if (IsIconic()) ud(0}[  
 { w%TrL+v  
  CPaintDC dc(this); // device context for painting sZ&6g<8#y  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); z &P1C,n)  
  // Center icon in client rectangle 5m'AT]5Tn_  
  int cxIcon = GetSystemMetrics(SM_CXICON); d3\?:}o,  
  int cyIcon = GetSystemMetrics(SM_CYICON); %^E 7Iqc  
  CRect rect; ceJ#>Rj  
  GetClientRect(&rect); "9^b1UH<  
  int x = (rect.Width() - cxIcon + 1) / 2; \tvL<U"'  
  int y = (rect.Height() - cyIcon + 1) / 2; bh5P98s  
  // Draw the icon NAtDt=  
  dc.DrawIcon(x, y, m_hIcon); ID`C  
 } fBZLWfp9  
 else #?r|6<4X  
 { #wT6IU1  
  CDialog::OnPaint(); 9[X'9* ,  
 } .czUJyFms}  
} 2<OU)rVE4  
-z. wAp  
HCURSOR CCaptureDlg::OnQueryDragIcon() ha;fxM]  
{ +1yi{!j1  
 return (HCURSOR) m_hIcon; L?;UcCB  
} Oq% TW|a#  
:4 z\Q]  
void CCaptureDlg::OnCancel() 3QZm *. /"  
{ OAiW8B Ae  
 if(bTray) (x/:j*`K  
  DeleteIcon(); zd8A8]&-  
  CDialog::OnCancel(); a;KdkykG  
} !pRu?5  
?[bE/Ya+S  
void CCaptureDlg::OnAbout() 2V% z=  
{ &d6ud |  
 CAboutDlg dlg; h*y+qk-!\g  
 dlg.DoModal(); t\QLj&h}E  
} $X-PjQb1Bb  
@8`I!fZ  
void CCaptureDlg::OnBrowse() 3B%7SX  
{ o ~y{9Q  
 CString str; oDD"h,Z  
 BROWSEINFO bi; !hfpa_5  
 char name[MAX_PATH]; Kv1~,j6  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); zRLJ|ejMP  
 bi.hwndOwner=GetSafeHwnd(); uUx7>algF  
 bi.pszDisplayName=name; >G"fMOOkW  
 bi.lpszTitle="Select folder"; /d6Rd l`w  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *XWu)>*o  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <X{w^ cT_Q  
 if(idl==NULL) #m UQ@X@K  
  return; C4PT(cezR  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); S]%,g%6i  
 str.ReleaseBuffer(); Bca$%3M  
 m_Path=str; @}R y7H0O  
 if(str.GetAt(str.GetLength()-1)!='\\') |6?s?tC"u  
  m_Path+="\\"; rxMo7px@}I  
 UpdateData(FALSE); =$bF[3D  
} -le^ 5M7  
TlyBpG=p  
void CCaptureDlg::SaveBmp() Y ~I>mc]  
{ Z@x&  
 CDC dc; >oyf i:  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); :ln| n6X  
 CBitmap bm; Z R=[@Oi  
 int Width=GetSystemMetrics(SM_CXSCREEN); F[O147&C  
 int Height=GetSystemMetrics(SM_CYSCREEN); ,)d`_AD+5  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ,KM%/;1Dm  
 CDC tdc; _hl| 3 eW5  
 tdc.CreateCompatibleDC(&dc);  r90tXx  
 CBitmap*pOld=tdc.SelectObject(&bm); `EMGrw_  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); \fC;b"j  
 tdc.SelectObject(pOld); iJ*Wsp  
 BITMAP btm; a]P%Y.? r  
 bm.GetBitmap(&btm); <4;, y*"n  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; GwDOxH'  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); NWiDNK[VE}  
 BITMAPINFOHEADER bih; 5QXU"kWH  
 bih.biBitCount=btm.bmBitsPixel; zb[kRo&a0W  
 bih.biClrImportant=0; 8r[TM  
 bih.biClrUsed=0; ?P|z,n{  
 bih.biCompression=0; !<j4*av:G  
 bih.biHeight=btm.bmHeight; +?3RC$jyw  
 bih.biPlanes=1; [#\OCdb*3  
 bih.biSize=sizeof(BITMAPINFOHEADER); C^'r>0  
 bih.biSizeImage=size; /<[_V/g[t?  
 bih.biWidth=btm.bmWidth; :+QNN<  
 bih.biXPelsPerMeter=0; .j,xh )v"  
 bih.biYPelsPerMeter=0; fk?!0M6d  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); X1}M_h %  
 static int filecount=0; <W3p!  
 CString name; 7z,  $  
 name.Format("pict%04d.bmp",filecount++); OA9 P"*  
 name=m_Path+name; gU&+^e >  
 BITMAPFILEHEADER bfh; S=V  
 bfh.bfReserved1=bfh.bfReserved2=0; (O09HY:  
 bfh.bfType=((WORD)('M'<< 8)|'B'); tGl|/  
 bfh.bfSize=54+size; -*w2<DCn  
 bfh.bfOffBits=54; q3/4l%"X  
 CFile bf; RWM~7^JA  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ yVn%Bz' [  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); =z9,=rR4  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 7|dm"%@  
  bf.WriteHuge(lpData,size); U,yZ.1V^:  
  bf.Close(); }0 H<G0   
  nCount++; S3U]AH)C  
 } -b+)Dp~$p  
 GlobalFreePtr(lpData); "N &ix*($  
 if(nCount==1) cC$YD]XdIA  
  m_Number.Format("%d picture captured.",nCount); 8R\6hYJ%F  
 else [D+PDR  
  m_Number.Format("%d pictures captured.",nCount); GFbn>dY  
  UpdateData(FALSE); G] tT=X[  
} b9i_\  
B$s6|~  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) BDPE.8s  
{ hV`?, ~K  
 if(pMsg -> message == WM_KEYDOWN) hF^JSCDz l  
 { >zJkG9a  
  if(pMsg -> wParam == VK_ESCAPE) yCkWuU9  
   return TRUE; O(0a l#Fvj  
  if(pMsg -> wParam == VK_RETURN) BOvJEs!UX  
   return TRUE; f`>\bdz  
 } tQ'R(H`  
 return CDialog::PreTranslateMessage(pMsg); @pv:uON\  
} Qz{Vl> "  
hTby:$aCg  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) J'=s25OWU  
{ c; .y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ]moBVRd  
  SaveBmp(); p\'X%R  
  return FALSE; G^|b*n!!  
} Z9% u,Cb  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Pk5\v0vkg  
 CMenu pop; >yVrIko  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ^56D)A=  
 CMenu*pMenu=pop.GetSubMenu(0); 3#udz C  
 pMenu->SetDefaultItem(ID_EXITICON); $ <[r3  
 CPoint pt; ;*Y+.?>a  
 GetCursorPos(&pt); t*BCpC }  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 30Q77,Nsny  
 if(id==ID_EXITICON) g.:ZMV  
  DeleteIcon(); H)*%eG~  
 else if(id==ID_EXIT) K|~ !oQ  
  OnCancel(); A9DFZZ0  
 return FALSE; at*DYZBjDB  
} +dq2}gM  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); R"t2=3K  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) +ZE"pA^C  
 AddIcon(); &V &beq4)p  
 return res; pG* W>F  
} z:dW'U?1  
J$jLGy&'  
void CCaptureDlg::AddIcon() n3/ Bs  
{ l_ x jsu  
 NOTIFYICONDATA data; 1dp8'f5^  
 data.cbSize=sizeof(NOTIFYICONDATA); Z$Qwn  
 CString tip; (l2n%LL]*  
 tip.LoadString(IDS_ICONTIP); \:n<&<aVSr  
 data.hIcon=GetIcon(0); 8r,0Qic2K  
 data.hWnd=GetSafeHwnd(); OaN"6Ge#  
 strcpy(data.szTip,tip); ^eRbp?H*T  
 data.uCallbackMessage=IDM_SHELL; t?weD{O  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; NgxJz ]b  
 data.uID=98; ) AGE"M3X  
 Shell_NotifyIcon(NIM_ADD,&data); UAI'tRY N_  
 ShowWindow(SW_HIDE); /k\)q  
 bTray=TRUE; ee Bw\f0  
} Ix=(f0|  
5V0#_!QAN  
void CCaptureDlg::DeleteIcon() ` -f\6r|:)  
{ vf?m6CMU !  
 NOTIFYICONDATA data; r:U<cL T[9  
 data.cbSize=sizeof(NOTIFYICONDATA); Ve"M8-{oKk  
 data.hWnd=GetSafeHwnd(); YO@~y *,  
 data.uID=98; h: z$uG  
 Shell_NotifyIcon(NIM_DELETE,&data); G [yI[7=d  
 ShowWindow(SW_SHOW); kOel !A  
 SetForegroundWindow(); YB{'L +Wbw  
 ShowWindow(SW_SHOWNORMAL); \Q?#^<O  
 bTray=FALSE; *'n=LB8R  
} {ueDwnZ  
/(s N@kt  
void CCaptureDlg::OnChange() w);Bet  
{ v&66F`  
 RegisterHotkey(); cSTL.QF  
} Qq.Ja%Zq  
FA%BzU5^  
BOOL CCaptureDlg::RegisterHotkey() uD4W@*PYr  
{ eM7 F8j  
 UpdateData(); >v/%R~BuX  
 UCHAR mask=0; UD2 l!)rW  
 UCHAR key=0; _*t75e$-  
 if(m_bControl) H5gcP11r  
  mask|=4; xWWVU}fd1  
 if(m_bAlt) T+5H2]yy)  
  mask|=2; `,c~M  
 if(m_bShift) ub4(g~E  
  mask|=1; e:QH3|'y  
  key=Key_Table[m_Key.GetCurSel()]; j2hp*C'^  
 if(bRegistered){ gb^'u  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Q'^$;X~-<  
  bRegistered=FALSE; $D*Yhv!/  
 } [XA:pj;rg'  
 cMask=mask; vcOw`oS  
 cKey=key; /5f=a  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); cdL0<J b,  
 return bRegistered; "@xL9[d  
} *>lXCx  
`7 Nk;  
  四、小结 !,DA`Yt  
Qz<i{r-z  
  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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