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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: :w!hkUx#  
  7BL)FJ]UR]  
  一、实现方法 ' ,S}X\  
SZyORN  
  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: N#ZWW6  
k}p8"'O  
#pragma data_seg("shareddata") $dXx@6fP  
HHOOK hHook =NULL; //钩子句柄 -jy0Kl/p  
UINT nHookCount =0; //挂接的程序数目 T=)qD2?  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Dk>6PBl  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ".%d{z}vz  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey d#]hqy  
static int KeyCount =0; :vX%0|  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 #\ `kg#&  
#pragma data_seg() ZX64kk+  
)UM^#<-  
  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。 Mn/@?K?y  
'A^q)hpax  
  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: [61*/=gWe  
2aX*|DGpw  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR f*B-aj#  
cKey,UCHAR cMask) dJ m9''T')  
{ ~D>pu%F  
 BOOL bAdded=FALSE; KX]!yA  
 for(int index=0;index<MAX_KEY;index++){ g&y^r/  
  if(hCallWnd[index]==0){ %T\hL\L?  
   hCallWnd[index]=hWnd; $xbW*w  
   HotKey[index]=cKey; k}Q<#   
   HotKeyMask[index]=cMask; I8j:{*h  
   bAdded=TRUE; kaXq.  
   KeyCount++; IhBc/.&RL  
   break; p7@R+F\.};  
  } [!yA#{xl,  
 } &e@)yVLL  
 return bAdded; 2jC`'8  
} :>2wVN&\c  
//删除热键 >Rd~-w)!|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (/N&_r4x  
{ )0iN2L]U;  
 BOOL bRemoved=FALSE; .1jiANY  
 for(int index=0;index<MAX_KEY;index++){ "GQ Q8rQ  
  if(hCallWnd[index]==hWnd){ %^HE^ &  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 9i}$245lB  
    hCallWnd[index]=NULL; y:}qoT_.  
    HotKey[index]=0; z-606g  
    HotKeyMask[index]=0; 3,Yr%`/5'  
    bRemoved=TRUE; 8"9&x} tl-  
    KeyCount--; >>,G3/Zd*  
    break; F{!pii5O9  
   } No} U[u.O  
  } z__?kY  
 } Xs2 jR14`  
 return bRemoved; w|-3X  
} ]5c(:T F  
%:d7Ts&?Z  
t+iHsCG)>  
  DLL中的钩子函数如下: ;//9,x9;t  
HyU:BW;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) r O$pj~!|Q  
{ ?nGiif  
 BOOL bProcessed=FALSE; ;6Yg}L  
 if(HC_ACTION==nCode) LCH\;07V#  
 { wuA?t  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 v={{ $=/t  
   switch(wParam) KDq="=q  
   {  o~IAZU39  
    case VK_MENU: nYj rEy)Q  
     MaskBits&=~ALTBIT; e))L&s  
     break; 3@Mh* \;\b  
    case VK_CONTROL: {9U!0h-2"  
     MaskBits&=~CTRLBIT; fk5'v   
     break; <[cpaZT,  
    case VK_SHIFT: O*~z@"\  
     MaskBits&=~SHIFTBIT; ;na%*G`  
     break; < ,*\t  
    default: //judge the key and send message {g<D:"Q  
     break; $TXxhd 6  
   } 8YQuq.(>a  
   for(int index=0;index<MAX_KEY;index++){ QMsq4yJ)%  
    if(hCallWnd[index]==NULL) fUkqhqe  
     continue; 0X5cn 0L^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w3(|A> s3  
    { q[a\a7U z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); uLS]=:BT  
     bProcessed=TRUE; fx5S2%f^  
    } #f2k*8"eAF  
   } 8m?(* [[  
  } B#Ybdp ;  
  else if((lParam&0xc000ffff)==1){ //有键按下 bTc >-e,  
   switch(wParam) lD0-S0i  
   { D4!;*2t  
    case VK_MENU: V| 97;  
     MaskBits|=ALTBIT; /{i~-DVME  
     break; dZ`Y>wH_  
    case VK_CONTROL: @%Ld\8vdfJ  
     MaskBits|=CTRLBIT; y9 {7+]  
     break; %Hbq3U30  
    case VK_SHIFT: |l; Ot=C=  
     MaskBits|=SHIFTBIT; qjP~F  
     break; W^tD6H;  
    default: //judge the key and send message '" "v7  
     break; A-CU%G9  
   } 9j>2C  
   for(int index=0;index<MAX_KEY;index++){ vn^O m-\  
    if(hCallWnd[index]==NULL) 't5ufAT  
     continue; #cfiN b}GX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;\mX=S|a  
    { 8(% F{&<;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); G;G*!nlWf  
     bProcessed=TRUE; )t|:_Z  
    } JX=rL6Y@:;  
   } _-_iw&F  
  } $*#^C;7O  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 )4 4Y`v  
   for(int index=0;index<MAX_KEY;index++){ [<R haZz  
    if(hCallWnd[index]==NULL) x|~8?i$%  
     continue; /grTOf&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) f,TW|Y'{g  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); MeEa|.  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ay?<~)H  
   } ^Spu/55_  
  } F?Lt-a+  
 } 6VGY4j}:(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); SsZC g#i  
} ?Ij(B}D  
lFBpNUnzU  
  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: 2?t@<M]  
M*zpl}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @sLN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); V!He2<  
7 m{lOR  
  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: !cyrt<  
'? 5-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^5sA*%T4  
{ gZ,h9 5'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) |2j,  
 { w \b+OW  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 wXQxZuk[  
  SaveBmp(); YhN<vZ}U!~  
  return FALSE; Z=a%)Ki?Ag  
 } " ]S  
 …… //其它处理及默认处理 O k`}\NZL  
} C t,p  
^^N|:80  
Jl~ *@0(  
  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。 tAAMSb9[d  
x6UXd~ L e  
  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。 SOOVUMj  
u<edO+  
  二、编程步骤 WO qDW~  
a2Ak?W1  
  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"; -l= 4{^pK  
Z =+Z96  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; xe!bfzU  
8fXiadP#  
  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; !Y~UO)u2  
Y2r}W3F=  
  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; Q@W/~~N  
cRT'?w`}  
  5、 添加代码,编译运行程序。 9J3fiA_  
?\V#^q-  
三、程序代码 f{P1.?a  
Jl{ 0q7b  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL nI*.(+h  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) +S4n416K  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ io4<HN  
#if _MSC_VER > 1000 Cyg2o<O@  
#pragma once )E^S+ps  
#endif // _MSC_VER > 1000 V`I4"}M1  
#ifndef __AFXWIN_H__ 7}kJp%-  
#error include 'stdafx.h' before including this file for PCH ! ?g+'OM  
#endif ix!xLm9\  
#include "resource.h" // main symbols FzInIif  
class CHookApp : public CWinApp *fg2bz<~[B  
{ 28!C#.(h  
 public: pa>C}jk}6  
  CHookApp(); 53i]Q;k[  
  // Overrides h:aa^a~y i  
  // ClassWizard generated virtual function overrides [neuwdN  
  //{{AFX_VIRTUAL(CHookApp) E5ce=$o  
 public: "-Q+!byh  
  virtual BOOL InitInstance(); /lBK )(  
  virtual int ExitInstance(); N'`X:7fN  
  //}}AFX_VIRTUAL 'ITq\1z  
  //{{AFX_MSG(CHookApp) Q~,Mzt"}W  
  // NOTE - the ClassWizard will add and remove member functions here. P<PZ4hNx  
  // DO NOT EDIT what you see in these blocks of generated code ! igxO:]?  
  //}}AFX_MSG p'R<yB)V  
  DECLARE_MESSAGE_MAP() P 45Irir  
}; |+nmOi,z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); N"70P/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F 3|^b{'zO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4aXIRu%#7  
BOOL InitHotkey(); _**Nlp*%  
BOOL UnInit(); 8 lggGt  
#endif ,2M}qs"P7G  
[Hh-F#|R  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. b>-DX  
#include "stdafx.h" n~^SwOt~;5  
#include "hook.h" pfN(Ae Pt  
#include <windowsx.h> :G _  
#ifdef _DEBUG q'mh*  
#define new DEBUG_NEW EvT$|#FY  
#undef THIS_FILE T\l`Y-vu  
static char THIS_FILE[] = __FILE__; _uIS[%4g  
#endif FZi@h  
#define MAX_KEY 100 Sm'Tz&!  
#define CTRLBIT 0x04 CRb*sfKDL  
#define ALTBIT 0x02 Z [!"x&H]h  
#define SHIFTBIT 0x01 -#Zdf |  
#pragma data_seg("shareddata") ^DYS~I%s  
HHOOK hHook =NULL; 5$9$R(KU  
UINT nHookCount =0;  *&_*G~>D  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey "jL>P )  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT _Y; TS1u  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey tV)CDA&Z  
static int KeyCount =0; zgb$@JC  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ',EI[ ]+  
#pragma data_seg() %Ig$:I(o  
HINSTANCE hins; :&BPKqKp  
void VerifyWindow(); rpow@@ad<  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ?ko#N?hgI  
//{{AFX_MSG_MAP(CHookApp) !5ps,+o  
// NOTE - the ClassWizard will add and remove mapping macros here. Os9SfL  
// DO NOT EDIT what you see in these blocks of generated code! /QXUD.( 8  
//}}AFX_MSG_MAP  3 xyrWl  
END_MESSAGE_MAP() z CLaHx!  
 t`o"K  
CHookApp::CHookApp() pD{OB  
{ Q#g`D,:o%~  
 // TODO: add construction code here, j`_S%E%X  
 // Place all significant initialization in InitInstance @A,8 >0+  
} +CSpL2@  
o~LJ+m6-)  
CHookApp theApp; CS[]T9|_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) aXe&c^AR  
{ NUsxMhP  
 BOOL bProcessed=FALSE; F[ E'R.:  
 if(HC_ACTION==nCode) '@{:Fr G*U  
 { o 4F'z  
  if((lParam&0xc0000000)==0xc0000000){// Key up MPB[~#:  
   switch(wParam) :>&q?xvA  
   { wps/{h,  
    case VK_MENU: #UM,)bH  
     MaskBits&=~ALTBIT; x3O%W?5  
     break; *6}M.`.-  
    case VK_CONTROL: =$'>VPQ  
     MaskBits&=~CTRLBIT; khy'Y&\F;  
     break; NW\CEJV  
    case VK_SHIFT: )@wC6Ij  
     MaskBits&=~SHIFTBIT; e;.,x 5+  
     break; {5 dVK  
    default: //judge the key and send message 't<iB&wgF  
     break; j )J |'b|  
   } ~5HkDtI)  
   for(int index=0;index<MAX_KEY;index++){ Olzw)WjG  
    if(hCallWnd[index]==NULL) E+L7[  
     continue; DGvuo 8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2 }xePX9?  
    { V(S7mA:T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u]*7",R uU  
     bProcessed=TRUE; /2K"Mpf8  
    } _pdKcE\X  
   } I\)`,w  
  } J9T2 p\5  
  else if((lParam&0xc000ffff)==1){ //Key down 7@c!4hmrU  
   switch(wParam) +#IUn  
   { $LXa]  
    case VK_MENU: B}"R@;N  
     MaskBits|=ALTBIT; i%i~qTN  
     break; 5:@bNNX'j  
    case VK_CONTROL: ?mH=3 :~  
     MaskBits|=CTRLBIT; ifn=De3+  
     break; zhJeTctRz  
    case VK_SHIFT: O nXo0PV/(  
     MaskBits|=SHIFTBIT; o#m31* o  
     break; {it.F4.  
    default: //judge the key and send message D6ZHvY8R  
     break; H!;N0",]N  
   } IyO 0~Vx>  
   for(int index=0;index<MAX_KEY;index++) * F!B4go  
   { hW*o;o7u  
    if(hCallWnd[index]==NULL) <'\Nv._2a  
     continue; PZ]tl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5_9`v@-4_  
    { }3z3GU8Q-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); X'OpR   
     bProcessed=TRUE; T!jh`;D+  
    } %FjUtB  
   } *BKD5EwS  
  } `EKf1U\FI  
  if(!bProcessed){ +`>7cy%cZ  
   for(int index=0;index<MAX_KEY;index++){ ,M.C]6YMr  
    if(hCallWnd[index]==NULL) ~ 5}t;  
     continue; pm O9mWq   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Bl\:YYd  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {a[BhK'g  
   } TuwP'g[  
  } I_1?J* b4k  
 } Y}[<KK}_  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); e'mF1al  
} k+_>`Gre}  
^wy  
BOOL InitHotkey() $ #=d@Nw_  
{ JA^!i98{  
 if(hHook!=NULL){ ed'[_T}T3t  
  nHookCount++; c]pz&  
  return TRUE; SK}jhm"y  
 } Fo3*PcUv  
 else *~8F.c x  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); O?vh]o  
  if(hHook!=NULL) 8~U ^G[!  
   nHookCount++; Z=% j|xE_  
  return (hHook!=NULL); `}Y)l:G*g  
} AE~zm tW  
BOOL UnInit() )WvKRp r  
{ CaYb}.:AX  
 if(nHookCount>1){ b`e_}^,c  
  nHookCount--; Ug*B[q/  
  return TRUE; Jxl'!8t  
 } W B:0}b0Gu  
 BOOL unhooked = UnhookWindowsHookEx(hHook); jr6 0;oK+  
 if(unhooked==TRUE){ W'6DwV|  
  nHookCount=0; !oyo_h  
  hHook=NULL; %; &lVIU0  
 } -'c qepC{T  
 return unhooked; HQ+{9Z8 ?5  
} Mmz; uy_  
mAlG }<  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) K+Him] b  
{ Dbn ~~P  
 BOOL bAdded=FALSE; e"866vc,  
 for(int index=0;index<MAX_KEY;index++){ i&DbZ=n2  
  if(hCallWnd[index]==0){ 72$S'O%,0  
   hCallWnd[index]=hWnd; 1V,@uY)s  
   HotKey[index]=cKey; fDr$Wcd~  
   HotKeyMask[index]=cMask; '6zZ`Ll9  
   bAdded=TRUE; hT^&*}G  
   KeyCount++; C2<TR PT  
   break; .qE  
  } 7c_2.T@4  
 } 9swHa  
 return bAdded; NFVu~t  
} g:uVl;>  
J *LPv9)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) EUSM4djL  
{ "nr?WcA  
 BOOL bRemoved=FALSE; KY&Lv^1_|  
 for(int index=0;index<MAX_KEY;index++){ h`U-{VIrqi  
  if(hCallWnd[index]==hWnd){ 7bYwh8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ R\cx-h*  
    hCallWnd[index]=NULL; R.i ]6H!  
    HotKey[index]=0; w*{{bISw|  
    HotKeyMask[index]=0; 3^KR{N p  
    bRemoved=TRUE; XrUI [ryE  
    KeyCount--; .?:#<=1  
    break; Q>L(=j2t  
   } [%^0L~:  
  } QE/kR!r  
 } /- Gq`9Z  
 return bRemoved; ]$#bNt/p  
} ,~7~ S"  
M*k,M=sX  
void VerifyWindow() VMABj\yG  
{ Uic  
 for(int i=0;i<MAX_KEY;i++){ aMu6{u6  
  if(hCallWnd!=NULL){ gjsks(x  
   if(!IsWindow(hCallWnd)){ e <+)IW:  
    hCallWnd=NULL; E3a^"V3p  
    HotKey=0; ok6t| 7sq  
    HotKeyMask=0; Gt{%O>P8t  
    KeyCount--; {_tq6ja-<  
   } BoT#b^l  
  } `[$>S  
 } ty5# a  
} :Xy51p`.;]  
NcbW"Qv3  
BOOL CHookApp::InitInstance() Z>UM gu3c  
{ ;8=Bee4  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); <LZ#A@]71  
 hins=AfxGetInstanceHandle(); "~ =O`5V  
 InitHotkey(); !hJ!ck]M  
 return CWinApp::InitInstance(); 7/M[T\c  
} /w?zO,!  
KHP/Y {mH  
int CHookApp::ExitInstance() !L +b{  
{ j#3IF *"  
 VerifyWindow(); ADF<5#I  
 UnInit(); '-(Z.e~e  
 return CWinApp::ExitInstance(); 5222"yn"c  
} 7 2i&-`&4  
'=G6$O2  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file L_ T+KaQCH  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _x|R`1`  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ >'#vC]@  
#if _MSC_VER > 1000 P#3J@aRC  
#pragma once kXdXyq  
#endif // _MSC_VER > 1000 uo?R;fX26  
y%9Hu  
class CCaptureDlg : public CDialog w^cQL%  
{ Mk9J~'C_  
 // Construction mb`h  
 public: "*HEXru#B  
  BOOL bTray; ^:$ShbX"P  
  BOOL bRegistered; cxQ %tL+S&  
  BOOL RegisterHotkey(); XFWE^*e=B  
  UCHAR cKey; ^[R/W VNk  
  UCHAR cMask; A|PZ<WAY  
  void DeleteIcon(); %qqCpg4  
  void AddIcon(); ts@w9|  
  UINT nCount; /F^ Jn_  
  void SaveBmp(); n4B uM R  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ,Y| ;V  
  // Dialog Data G,+3(C  
  //{{AFX_DATA(CCaptureDlg) D'%M#S0   
  enum { IDD = IDD_CAPTURE_DIALOG }; -`\n/"#X6i  
  CComboBox m_Key; Wm}T=L`  
  BOOL m_bControl; s(Wys^[g  
  BOOL m_bAlt; -|u yJh  
  BOOL m_bShift; nm_taER  
  CString m_Path; /?j kVy*"  
  CString m_Number; N2|NYDQs  
  //}}AFX_DATA yXIJeo"  
  // ClassWizard generated virtual function overrides j"Ew)6j  
  //{{AFX_VIRTUAL(CCaptureDlg) 00SS<iX  
 public: @K S.H  
  virtual BOOL PreTranslateMessage(MSG* pMsg); [j TU nP  
 protected: ?.-+U~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support KbciRRf!k  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ,c`Wmp^AY  
  //}}AFX_VIRTUAL Gh6U<;V?*  
  // Implementation ?Vh#Gr  
 protected: }Q9+krrow  
  HICON m_hIcon; 7wY0JS$fz  
  // Generated message map functions rmC7!^/  
  //{{AFX_MSG(CCaptureDlg) }4piZ ch  
  virtual BOOL OnInitDialog(); DTsD<o  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?b}e0C-a  
  afx_msg void OnPaint(); Z6-  
  afx_msg HCURSOR OnQueryDragIcon(); YIIc@ )  
  virtual void OnCancel(); v=dK2FaY  
  afx_msg void OnAbout(); gw">xt5  
  afx_msg void OnBrowse(); M17+F?27M  
  afx_msg void OnChange(); /V2yLHm  
 //}}AFX_MSG s^.tj41Gx}  
 DECLARE_MESSAGE_MAP() o*E32#l  
}; > Xij+tt{  
#endif Hj1?c,mo4  
j%ZBAk)}  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file aMT=pGU  
#include "stdafx.h" C]3:&dx9  
#include "Capture.h" Y~*aA&D  
#include "CaptureDlg.h" x&JD~,Y  
#include <windowsx.h> ~PAI0+*"q  
#pragma comment(lib,"hook.lib") \QG2V$  
#ifdef _DEBUG }G^'y8U  
#define new DEBUG_NEW m$hkmD|  
#undef THIS_FILE '~7zeZ'  
static char THIS_FILE[] = __FILE__; -2u)orWP  
#endif h3GUFiZ.  
#define IDM_SHELL WM_USER+1 zmu+un"\j  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); u|\?6fz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \J#&]o)Y  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};  JJs*2y  
class CAboutDlg : public CDialog egr"og{  
{ ?|_i"*]l  
 public: oLq N  
  CAboutDlg(); '6g-]rE[  
  // Dialog Data j B1ZF#  
  //{{AFX_DATA(CAboutDlg) 9; 9ge  
  enum { IDD = IDD_ABOUTBOX }; QX&Y6CC`]  
  //}}AFX_DATA @KHY8y7  
  // ClassWizard generated virtual function overrides o!&+ _BKw  
  //{{AFX_VIRTUAL(CAboutDlg) Vo.~1^  
 protected: fo~*Bp()-E  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support WCk. K  
  //}}AFX_VIRTUAL C1l'<  
  // Implementation \"L0d1DK)  
 protected: /C <p^#g9.  
  //{{AFX_MSG(CAboutDlg) &U`ug"/k  
  //}}AFX_MSG WWOt>C~zV  
  DECLARE_MESSAGE_MAP() r=7!S8'  
}; `}L{gssv  
)J+A2>  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ~J#Z7y]p!j  
{  M_%c9g@x  
 //{{AFX_DATA_INIT(CAboutDlg) z yp3 +|  
 //}}AFX_DATA_INIT iweT @P`  
} A>mk0P)~Q  
Akws I@@  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) k!bJ&} Q(b  
{ 35x]'  
 CDialog::DoDataExchange(pDX);  n0EW U,1  
 //{{AFX_DATA_MAP(CAboutDlg) DSq?|H  
 //}}AFX_DATA_MAP @,2,(=l*C  
} D#`>p  
0%q H=do6  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) se]&)%p[  
 //{{AFX_MSG_MAP(CAboutDlg) f+1'Ah0'E  
 // No message handlers p*T[(\8{n  
 //}}AFX_MSG_MAP E="uDHw+  
END_MESSAGE_MAP() Z.x]6  
3Of!Ykf=  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 9%"\s2T  
: CDialog(CCaptureDlg::IDD, pParent) >vYb'%02  
{ C(8!("tU  
 //{{AFX_DATA_INIT(CCaptureDlg) 1;B&R89}  
  m_bControl = FALSE; m],.w M8  
  m_bAlt = FALSE; Bu?Qyz2O  
  m_bShift = FALSE; m6}_kzFz  
  m_Path = _T("c:\\"); {.;qz4d`  
  m_Number = _T("0 picture captured."); hM>.xr  
  nCount=0; 8TU(5:xJo  
  bRegistered=FALSE; %~>-nqS  
  bTray=FALSE; E`C !q X>  
 //}}AFX_DATA_INIT Oz&*A/si+3  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >pJ#b=  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;kR=vv  
} 3J/l>1[  
)iK:BL*Nw  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) s5Wb iOF  
{ zKaj<Og  
 CDialog::DoDataExchange(pDX); bC) <K/Q9  
 //{{AFX_DATA_MAP(CCaptureDlg) rce._w }  
  DDX_Control(pDX, IDC_KEY, m_Key); a"t~ K  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 4%_xT o  
  DDX_Check(pDX, IDC_ALT, m_bAlt); .!i`YT*jF  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); R(8?9-w  
  DDX_Text(pDX, IDC_PATH, m_Path); %XZhSmlf  
  DDX_Text(pDX, IDC_NUMBER, m_Number); _ yDDPuAi  
 //}}AFX_DATA_MAP f|F=)tJO  
} JY;u<xl  
I36%oA  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) O?"uM>r  
//{{AFX_MSG_MAP(CCaptureDlg) myqwU`s  
 ON_WM_SYSCOMMAND() yx*<c#Uf  
 ON_WM_PAINT() S;D]ym  
 ON_WM_QUERYDRAGICON() ro3%VA=V  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) -xN/H,xok  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) L 8;H_:~_'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) a'n17d&  
//}}AFX_MSG_MAP dV}]\ 8N  
END_MESSAGE_MAP() \1n (Jr.<  
9Nx%Sdu  
BOOL CCaptureDlg::OnInitDialog() l%?4L/J)#  
{  ylS6D  
 CDialog::OnInitDialog(); 4PkKL/E  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Q 8;JvCz   
 ASSERT(IDM_ABOUTBOX < 0xF000); Dfc% jWbA  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 2+C:Em0yI  
 if (pSysMenu != NULL) ;4GGXT++L  
 { f4F%\ "  
  CString strAboutMenu; W2zG"Q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ^K_FGE0ec  
  if (!strAboutMenu.IsEmpty()) h;y}g/HZ  
  { VZ">vIRyi|  
   pSysMenu->AppendMenu(MF_SEPARATOR); v"mZy,u  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); s1#A0%gx  
  } bKzG5|Qu  
 } ![fNlG!r  
 SetIcon(m_hIcon, TRUE); // Set big icon #Ak|p#7 ^  
 SetIcon(m_hIcon, FALSE); // Set small icon 1wd c4>  
 m_Key.SetCurSel(0); ~Eb:AC5  
 RegisterHotkey(); v<<ATs%w  
 CMenu* pMenu=GetSystemMenu(FALSE); _g( aO70Zu  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); wi+L 4v  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Yo=$@~vN]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); o~L(;A]yN  
 return TRUE; // return TRUE unless you set the focus to a control ~Lg ;7i1L  
} EE`[J0 (  
F#RNm5  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) x2r.4  
{ V}7)>i$A  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) bhbTloCR  
 { %;= ?r*]  
  CAboutDlg dlgAbout; 3;wiwN'  
  dlgAbout.DoModal(); N`3^:EJL8  
 } mO(Y>|mm  
 else so/0f1R?~  
 { J|^z>gP(  
  CDialog::OnSysCommand(nID, lParam); +{m+aHk  
 } A=Hv}lv  
} zxH<~2  
0 z]H=  
void CCaptureDlg::OnPaint() J P5en  
{ UIg?3J}R  
 if (IsIconic()) KsK]y,^Z  
 { ;3xi.^=B  
  CPaintDC dc(this); // device context for painting gy~2LY!}  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); `-R&4%t%  
  // Center icon in client rectangle v}D0t]  
  int cxIcon = GetSystemMetrics(SM_CXICON); *QI Yq  
  int cyIcon = GetSystemMetrics(SM_CYICON); w Jp1Fl~  
  CRect rect; I|>.&nb  
  GetClientRect(&rect); J7aYi]vI  
  int x = (rect.Width() - cxIcon + 1) / 2; /me ]sOkn  
  int y = (rect.Height() - cyIcon + 1) / 2; @p}_"BHYWt  
  // Draw the icon %hw4IcWJ|  
  dc.DrawIcon(x, y, m_hIcon); K IR3m )  
 } LpSF*xm  
 else }|N88PN  
 { [Ob'E!;<  
  CDialog::OnPaint(); V"2 G  
 } +RR6gAma}<  
} ?TIi0;h  
72J=_d>+  
HCURSOR CCaptureDlg::OnQueryDragIcon() Qy}pn=#Q  
{ i+< v7?:`#  
 return (HCURSOR) m_hIcon; T<b* =i  
} yJO Jw o^  
$cwmfF2C  
void CCaptureDlg::OnCancel() !$ii*}  
{ =h +SZXe<r  
 if(bTray) }Qe(6'l_  
  DeleteIcon(); A:2CP&*  
  CDialog::OnCancel(); XqhrQU|wM  
} P>)J:.tr0  
r!eW]M  
void CCaptureDlg::OnAbout() 8t, &dq  
{ RW1+y/#%P  
 CAboutDlg dlg; Z(t O]tQE  
 dlg.DoModal(); Nq\)o{<1  
} `.3.n8V  
&y|PseH"  
void CCaptureDlg::OnBrowse() 8g-Z~~0W1  
{ 2@pEiq3  
 CString str; "x HK*  
 BROWSEINFO bi; |O'*CCrCL  
 char name[MAX_PATH]; 9 BU#THDm  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Eyk:pnKJb  
 bi.hwndOwner=GetSafeHwnd(); eY^zs0  
 bi.pszDisplayName=name; -%P}LaC <  
 bi.lpszTitle="Select folder"; h8Oj E$ H  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; J(maJuY  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); y;4g>ma0  
 if(idl==NULL) 3 Fy C D4#  
  return; H.C*IL9  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); +Zr~mwM=x  
 str.ReleaseBuffer(); 4KSq]S.  
 m_Path=str; :[f[-F  
 if(str.GetAt(str.GetLength()-1)!='\\') +~o f#  
  m_Path+="\\"; !+z^VcV  
 UpdateData(FALSE); #Cy3x-!  
} )+8r$ i  
ZG#:3d*)  
void CCaptureDlg::SaveBmp()  cC|  
{ V*(x@pF  
 CDC dc; x%goyXK  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %21|-B  
 CBitmap bm; Lc[TIX  
 int Width=GetSystemMetrics(SM_CXSCREEN); 02%~HBS  
 int Height=GetSystemMetrics(SM_CYSCREEN);  iycceZ  
 bm.CreateCompatibleBitmap(&dc,Width,Height); OT=1doDp  
 CDC tdc; ?MmQ'1N  
 tdc.CreateCompatibleDC(&dc); )p>p3b g  
 CBitmap*pOld=tdc.SelectObject(&bm); u>agVB4\F  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 8\:>;XG6f  
 tdc.SelectObject(pOld); 7t}s5}Z 4  
 BITMAP btm; Ygkf}n  
 bm.GetBitmap(&btm); ?1 Vx)j>|  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; T"C.>G'[B  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ,)J>8eV  
 BITMAPINFOHEADER bih; (18ZEKk  
 bih.biBitCount=btm.bmBitsPixel; tX1`/}``  
 bih.biClrImportant=0; )\2KDXc  
 bih.biClrUsed=0; /38I (0  
 bih.biCompression=0; 77aUuP7Iw  
 bih.biHeight=btm.bmHeight; n_LK8  
 bih.biPlanes=1; TvT>UBqj=  
 bih.biSize=sizeof(BITMAPINFOHEADER); 3B,dL|q(@J  
 bih.biSizeImage=size; ~]?EV?T  
 bih.biWidth=btm.bmWidth; KydAFxUb  
 bih.biXPelsPerMeter=0; \T<F#a  
 bih.biYPelsPerMeter=0; i;]# @n|  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); !Icznou\  
 static int filecount=0; (Pw,3CbJ  
 CString name; )dEcKH<#  
 name.Format("pict%04d.bmp",filecount++); Otq1CD9  
 name=m_Path+name; D8 PC;@m  
 BITMAPFILEHEADER bfh; L\c3D|  
 bfh.bfReserved1=bfh.bfReserved2=0; I5g|)Y Q  
 bfh.bfType=((WORD)('M'<< 8)|'B'); B1E:P`t  
 bfh.bfSize=54+size; ;!t?*  
 bfh.bfOffBits=54; ^J^FGo|M  
 CFile bf; QkD]9#Id&  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ hgE :2@  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); s~B)xYmyB'  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); v UO[V$rx  
  bf.WriteHuge(lpData,size); 5[)#3vY  
  bf.Close(); ya^8mp-  
  nCount++; C\ Yf]J  
 } t98S[Z(-%+  
 GlobalFreePtr(lpData); +_S0  
 if(nCount==1) c~OPH 0,  
  m_Number.Format("%d picture captured.",nCount); 7 <]YK`a2d  
 else 52Dgul  
  m_Number.Format("%d pictures captured.",nCount);  < ]+Mdy  
  UpdateData(FALSE); wmXI8'~F&  
} z-g6d(  
;1nXJ{jKw  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Y9vi&G?Jl  
{ iCh 8e>+  
 if(pMsg -> message == WM_KEYDOWN) rLmc(-q  
 { ~!7x45( 1#  
  if(pMsg -> wParam == VK_ESCAPE) ZHeq)5C ;f  
   return TRUE; ;/?w-)n?  
  if(pMsg -> wParam == VK_RETURN) t>*(v#WeZ  
   return TRUE; 3W#E$^G_v  
 } !^0vi3I  
 return CDialog::PreTranslateMessage(pMsg); `Je1$)%  
} QOrMz`OA  
g=qaq  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) /iQh'rp  
{ J>;r(j  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ <6,,:=#  
  SaveBmp(); h>cjRH?e  
  return FALSE; cT/mi": 8{  
} %0}}Qt  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2DJg__("  
 CMenu pop; L;{{P7  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); cVO- iPK  
 CMenu*pMenu=pop.GetSubMenu(0); [cznhIvyO  
 pMenu->SetDefaultItem(ID_EXITICON); K{@xZ)  
 CPoint pt; 0_+ & [g}  
 GetCursorPos(&pt); }-XZ1qr  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); cwtlOg  
 if(id==ID_EXITICON) (0`w.n  
  DeleteIcon(); B|$o.$5  
 else if(id==ID_EXIT) vRf$#fBEQ  
  OnCancel(); 7w8UnPuM  
 return FALSE; uW#s;1H.)  
} hm0A%Js  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); I} +up,B]o  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 8d Fqwpw8  
 AddIcon(); OU#p^ 5K  
 return res; 6d/v%-3  
} +s;Vfc$b]H  
hmG8 {h/  
void CCaptureDlg::AddIcon() ~ QohP`_  
{ g&EK^q  
 NOTIFYICONDATA data; Y{#*;p*I  
 data.cbSize=sizeof(NOTIFYICONDATA); /'_<~A  
 CString tip; (pP.*`JRv  
 tip.LoadString(IDS_ICONTIP); _JTK$ \  
 data.hIcon=GetIcon(0); (aSuxl.Dq  
 data.hWnd=GetSafeHwnd(); zF{~Md1  
 strcpy(data.szTip,tip); K `<HZK  
 data.uCallbackMessage=IDM_SHELL; Pi9?l>  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; XD0a :T)  
 data.uID=98; P6ktA-Hv>  
 Shell_NotifyIcon(NIM_ADD,&data); LayK&RwL  
 ShowWindow(SW_HIDE); 4(oU88 z  
 bTray=TRUE; ;~d$O M  
} >#l: ]T  
S+- $Ih`[  
void CCaptureDlg::DeleteIcon() =h|cs{eT\2  
{ Zby3.=.e  
 NOTIFYICONDATA data; CQa8I2VF (  
 data.cbSize=sizeof(NOTIFYICONDATA); zks7wt]A  
 data.hWnd=GetSafeHwnd(); L Yd:S  
 data.uID=98; oqh J2  
 Shell_NotifyIcon(NIM_DELETE,&data); xJU]py~o  
 ShowWindow(SW_SHOW); *_#2|96)  
 SetForegroundWindow(); M l@F  
 ShowWindow(SW_SHOWNORMAL); N3MPW  
 bTray=FALSE; +S-60EN*A  
} fR{_P  
7ZyP  
void CCaptureDlg::OnChange() r7R.dD /.  
{ =_m3 ~=Z  
 RegisterHotkey(); }BL7P-km  
} cZ)mp`^n7  
&nI>`Q'  
BOOL CCaptureDlg::RegisterHotkey() Qo^(r$BD  
{ I_Gz~qk6  
 UpdateData(); !~R<Il|B  
 UCHAR mask=0; !.t D.(XP  
 UCHAR key=0; 74:~F)BP  
 if(m_bControl) rKFnivGT  
  mask|=4; $M!iQ"bb  
 if(m_bAlt) w4}Q6_0v  
  mask|=2; K{`R`SXD  
 if(m_bShift) lA1  
  mask|=1; y06**f)  
  key=Key_Table[m_Key.GetCurSel()]; Tbv w?3  
 if(bRegistered){ ~tRGw^<9  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Is<XMR|{  
  bRegistered=FALSE; j%w^8}U>G  
 } hAc|a9 o  
 cMask=mask; LW.j)wB]  
 cKey=key; EU|IzUjFj|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (S+/e5c)  
 return bRegistered; JR15y3 F  
} -@`Ah|m@}  
Yo' Y-h#  
  四、小结 p=E#!cn3  
P2aFn=f  
  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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