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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: $$$[Vn_H<  
  hc W>R  
  一、实现方法 $mT)<N ;w  
/pRv i>_(:  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: .8'c c8  
-I4@6v E,  
#pragma data_seg("shareddata") ,]t_9B QK  
HHOOK hHook =NULL; //钩子句柄 A#`$#CO  
UINT nHookCount =0; //挂接的程序数目 Lt~&K$t7~  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Eg&5tAyM  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 (0@b4}Z  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey _*z ^PkH  
static int KeyCount =0; OeGLMDw  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 E 6#/@C,  
#pragma data_seg() mdbi@ms@  
y.( <  
  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。 jcC"vr'u|  
InL_JobE8r  
  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: %4R1rUrgt|  
IPTFx )]G  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR `#ff`j|a  
cKey,UCHAR cMask) B3yTN6-  
{ jc3Q3Th/zn  
 BOOL bAdded=FALSE; k"=*'  
 for(int index=0;index<MAX_KEY;index++){ 2asRJ97qES  
  if(hCallWnd[index]==0){ tW!*W?  
   hCallWnd[index]=hWnd; ?}KD<R  
   HotKey[index]=cKey; J>M9t%f@  
   HotKeyMask[index]=cMask; fJNK@F  
   bAdded=TRUE; leF!Uog  
   KeyCount++; %INkuNa8\  
   break; hKg +A  
  } IPn!iv)  
 } W2%@}IDm  
 return bAdded;  +mft  
} UFZOu%Y  
//删除热键 HP7~Zn)c  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0`V=x+*,  
{ 0i5S=L`j  
 BOOL bRemoved=FALSE; $U/lm;{%  
 for(int index=0;index<MAX_KEY;index++){ *" OlO}o  
  if(hCallWnd[index]==hWnd){ #Mk3cp^Yl  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ eU)QoVt  
    hCallWnd[index]=NULL; G]$EIf'  
    HotKey[index]=0; CL`+\ .  
    HotKeyMask[index]=0; T++q.oFc  
    bRemoved=TRUE; @#^Y# rxb  
    KeyCount--; iD cYyNE  
    break; |aU8WRq  
   } )n<p_vz  
  } uF[*@N  
 } Xe:rPxZf~  
 return bRemoved; V$FZVG/@#  
} NB44GP1-@  
+BO kHXk1  
T#6g5Jnsp  
  DLL中的钩子函数如下: Kwm_Y5`A  
CY.92I@S  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) S~H>MtX(<  
{ EUh_`R  
 BOOL bProcessed=FALSE; x|AND]^Q  
 if(HC_ACTION==nCode) <_k A+&T  
 { MSBrI3MqQ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Y^DGnx("m  
   switch(wParam) 3.P7GbN  
   {  Xf"< >M  
    case VK_MENU: 1he5Zevm}  
     MaskBits&=~ALTBIT; v>nBdpjXh  
     break; rtbV*@Z  
    case VK_CONTROL: 2yFT` 5+H4  
     MaskBits&=~CTRLBIT; _E8Cvaob  
     break; W2v'2qAs  
    case VK_SHIFT: Gj%q:[r  
     MaskBits&=~SHIFTBIT; 4i&Rd1#0dI  
     break; 8mLW^R:`  
    default: //judge the key and send message $0OOH4  
     break; &PApO{#Q  
   } S[hyN7sI  
   for(int index=0;index<MAX_KEY;index++){ +e.w]\}  
    if(hCallWnd[index]==NULL) T~L V\}h  
     continue; q$b 4S4Z7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _NwHT`O[  
    { br TP}A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9@IL547V  
     bProcessed=TRUE; NX8hFwR  
    } 2"shB(:z>  
   } QBi]gT@&g  
  } }CZw'fhVWO  
  else if((lParam&0xc000ffff)==1){ //有键按下 JC9$"0d7  
   switch(wParam) g]N'6La  
   { tcRJ1:d  
    case VK_MENU: cX4]ViXSr  
     MaskBits|=ALTBIT; K1R?Qt,qDF  
     break; {_Ll'S  
    case VK_CONTROL: G9am}qr  
     MaskBits|=CTRLBIT; ?*xH HI/  
     break; ypGt6t(;  
    case VK_SHIFT: oP4+:r)LKD  
     MaskBits|=SHIFTBIT; <s\ZqL$ f  
     break; h6IXD N  
    default: //judge the key and send message >!lpI5'Z&  
     break; E`@Z9k1 `  
   } dKD:mU",M  
   for(int index=0;index<MAX_KEY;index++){ %,<Ki]F  
    if(hCallWnd[index]==NULL) ."O%pL]!/b  
     continue; h 6?Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z$~F9Es9  
    { I S'Uuuz7g  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Ol h{<~Fv  
     bProcessed=TRUE; '|yCDBu  
    } @-xvdntx  
   } X6(s][Wn  
  }  \G)F*  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 9iM%kY#)W  
   for(int index=0;index<MAX_KEY;index++){ S3WUccv  
    if(hCallWnd[index]==NULL) 2P^qZDG 8I  
     continue; Wi!"V cn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) TXyiCS3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Px*<-t|R-  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 djw\%00&#  
   } |Ox='.oIb  
  } xYW &Mfka  
 } @^.W|Zh[&  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); VlL%dN; 0  
} 53a^9  
j!%^6Io4  
  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: ^Mc9MZ)  
|</)6r  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (C).Vj~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ar,n=obG  
FY^Nn  
  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: |S |'o*u  
s0D4K  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) jf)l; \u  
{ `=,emP&(H&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) M;OMsRCVO  
 { {i8 zM6eC  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 LGW_7&0<<  
  SaveBmp(); &(32s!qH  
  return FALSE; -MTYtw(  
 } K r|.I2?"  
 …… //其它处理及默认处理 ^[Ka+E^Q  
} )7 8T+7Kq  
R)\^*tkz7  
BbC O K  
  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。 woP j>M  
NIbK3`1  
  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。 {]dtA&8(  
Ov?J"B'F  
  二、编程步骤 IOuqC.RJ}o  
S1mMz i  
  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"; kL0K[O  
-]D/8,|s  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Pgy[\t2K  
6W=V8  
  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; 7C3YVm6g  
fbbbTZy  
  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; Dat',5  
3z2 OW@zL$  
  5、 添加代码,编译运行程序。 6(4d3}F  
6X m'^T  
三、程序代码 T :m" eD;  
CPRVSN0b{4  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL h"0)spF"d  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) u5glKE  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ h ! R=t  
#if _MSC_VER > 1000 ArNQ}F/  
#pragma once p@4GI[4  
#endif // _MSC_VER > 1000 0NC70+4L  
#ifndef __AFXWIN_H__ 7dACbqba  
#error include 'stdafx.h' before including this file for PCH pb)8?1O|s  
#endif (?JdiY/  
#include "resource.h" // main symbols bDtb6hL  
class CHookApp : public CWinApp fC*cqc~{@  
{ -,p=;t#(  
 public: ZcyGLg0I  
  CHookApp(); 7>F{.\Z  
  // Overrides +>vKI8g*RH  
  // ClassWizard generated virtual function overrides [x>Ju&))$  
  //{{AFX_VIRTUAL(CHookApp) 9CeR^/i  
 public: 6:Z8d%Z  
  virtual BOOL InitInstance(); tLfhW1"  
  virtual int ExitInstance(); Cgh84 2%  
  //}}AFX_VIRTUAL NE8W--Cg|  
  //{{AFX_MSG(CHookApp) tB,(12@W  
  // NOTE - the ClassWizard will add and remove member functions here. GjHR.p?-  
  // DO NOT EDIT what you see in these blocks of generated code ! q=BljSX  
  //}}AFX_MSG !@8i(!xb  
  DECLARE_MESSAGE_MAP() VK1B}5/  
}; }F_c0zM  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); KbvMp1'9P  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z CPUNtOl  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); fTvm2+.nX  
BOOL InitHotkey(); X V;j6g  
BOOL UnInit(); `a|&aj0  
#endif }P fAf  
A&~fw^HM  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. TxP +?1t  
#include "stdafx.h" <L#d <lx  
#include "hook.h" }>u `8'2v  
#include <windowsx.h> H%>4z3n   
#ifdef _DEBUG u%)gnj_  
#define new DEBUG_NEW 3+>n!8x ;A  
#undef THIS_FILE d>8" -$  
static char THIS_FILE[] = __FILE__; o1$u;}^|  
#endif 4<F z![>  
#define MAX_KEY 100 %(lO>4>|  
#define CTRLBIT 0x04 CYW@Km{e  
#define ALTBIT 0x02 $%cc[[/U  
#define SHIFTBIT 0x01 )XK\[tL  
#pragma data_seg("shareddata") $P0q!  
HHOOK hHook =NULL; '!Hs"{~{  
UINT nHookCount =0; 6,3o_"J!  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Nq6'7'x  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT GN(<$,~g  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey !ou#g5Q@z  
static int KeyCount =0; jBw)8~tYm  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift K -rR)-rI  
#pragma data_seg() ls]N&!/hq  
HINSTANCE hins; V<0iYi;4=  
void VerifyWindow(); CPP~,E_  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ?";SUku  
//{{AFX_MSG_MAP(CHookApp) ,=m.WmXE  
// NOTE - the ClassWizard will add and remove mapping macros here. Jd>~gA}l  
// DO NOT EDIT what you see in these blocks of generated code! s51$x M  
//}}AFX_MSG_MAP J @"#  
END_MESSAGE_MAP() +hmFFQQ}  
.w.:o2L  
CHookApp::CHookApp() LJ(WU)CPc  
{ = (F   
 // TODO: add construction code here, -o6rY9\_!  
 // Place all significant initialization in InitInstance -y+>^45  
} :OY~Q3 @  
'cXdc  
CHookApp theApp; UUJQc ~=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ilL0=[2  
{ "S%t\  
 BOOL bProcessed=FALSE; EX`P(=zD  
 if(HC_ACTION==nCode) EbQLMLD%  
 { `S@TiD*  
  if((lParam&0xc0000000)==0xc0000000){// Key up )O~[4xV~  
   switch(wParam) S13cQ?4  
   { GrL{q;IO  
    case VK_MENU: ^QRg9s,T<  
     MaskBits&=~ALTBIT; |:=o\eu&  
     break; /8h=6"  
    case VK_CONTROL: H0Pxw P>q  
     MaskBits&=~CTRLBIT; Bvn3:+(47  
     break; neDXzMxF  
    case VK_SHIFT: G:=hg6 '  
     MaskBits&=~SHIFTBIT; ZYwcB]xE z  
     break; WD[eoi  
    default: //judge the key and send message my.EvN  
     break; u#E'k KGO  
   } pSw/QO9  
   for(int index=0;index<MAX_KEY;index++){ v~P,OP("c  
    if(hCallWnd[index]==NULL) o|(5Sr&H  
     continue; NXY jb(4:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I#M3cI!X?  
    { ;!4gDvm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); M<fhQJ  
     bProcessed=TRUE; `a& kD|Yh  
    } yLX $SR  
   } ATNOb  
  } 1PkCWRpR  
  else if((lParam&0xc000ffff)==1){ //Key down @^W`Yg)C  
   switch(wParam) 18>cfDh;N  
   { %t9C  
    case VK_MENU: DmiBM6t3N  
     MaskBits|=ALTBIT; N6U d(8*  
     break; W_\zx<m  
    case VK_CONTROL: %fqR  
     MaskBits|=CTRLBIT; wSTul o:9  
     break; hArY$T&MB  
    case VK_SHIFT: TC\+>LXiZ  
     MaskBits|=SHIFTBIT; !+T1kMP+l  
     break; ?['!0PF  
    default: //judge the key and send message  }vd*eexA  
     break; SiratkP9n7  
   } SA x9cjj+  
   for(int index=0;index<MAX_KEY;index++) ]k0 jmE  
   { x *eU~e_jP  
    if(hCallWnd[index]==NULL) ,fVD`RR(W?  
     continue; p T(M>LP83  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ux [<g%F"  
    { V2YK  T,5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); M ?$[WS  
     bProcessed=TRUE; >Jz9wo`  
    } y>^^.  
   } IHl q27O  
  } ^OR0Vp>L  
  if(!bProcessed){ 5'~_d@M  
   for(int index=0;index<MAX_KEY;index++){ _kj]vbG^;  
    if(hCallWnd[index]==NULL) "s*-dZO  
     continue; J!6FlcsZm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) RLB3 -=9t  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *T|B'80  
   } -4a9BE".  
  } #WpkL]g2+%  
 } {meX2Z4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); nM )C^$3<t  
} O !L`0 =%c  
VM"cpC_8  
BOOL InitHotkey() *eVq(R9?T  
{ 'X`Z1L/  
 if(hHook!=NULL){ yPm2??5MW>  
  nHookCount++; /Rp]"S vt  
  return TRUE; [I $+wWW_  
 } RpHlq  
 else ;?-AFd\i  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); hvd}l8  
  if(hHook!=NULL) Y ::0v@&(  
   nHookCount++; lfGyK4:  
  return (hHook!=NULL); C$3*[  
} T(4d5 fY  
BOOL UnInit() ]T4/dk&|o^  
{ kIrrbD  
 if(nHookCount>1){ yVd^A2  
  nHookCount--; -EjXVn! vQ  
  return TRUE; $`=p]  
 } f-=\qSo  
 BOOL unhooked = UnhookWindowsHookEx(hHook); :$5A3i  
 if(unhooked==TRUE){ gg;r;3u  
  nHookCount=0; E h%61/  
  hHook=NULL; 5jdZC(q5a  
 } ^[L(kHOGzk  
 return unhooked; J~Xv R  
} ]$ew 5%  
[uq>b|`R G  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) pMc6p0  
{ fCl}eXg6w  
 BOOL bAdded=FALSE; ]Z JoC!u  
 for(int index=0;index<MAX_KEY;index++){ XC4Z,,ah"  
  if(hCallWnd[index]==0){ ,g`%+s7u  
   hCallWnd[index]=hWnd; c}x1-d8  
   HotKey[index]=cKey; X'9.fKp  
   HotKeyMask[index]=cMask; X|M!Nt0'  
   bAdded=TRUE; E-MPFL  
   KeyCount++; +jN}d=N-  
   break; !XA3G`}p6s  
  } 7p&jSOY  
 } XX;4A  
 return bAdded; 30Yis_l2h  
} bdUPo+  
"}]`64?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) # kI>  
{ R#(0C(FI^  
 BOOL bRemoved=FALSE; F /b`[  
 for(int index=0;index<MAX_KEY;index++){ X>%nzY]m  
  if(hCallWnd[index]==hWnd){ 3P>gDQP  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _`$LdqgE  
    hCallWnd[index]=NULL;  )vr@:PE  
    HotKey[index]=0; j)1yv.  
    HotKeyMask[index]=0; uGKjZi  
    bRemoved=TRUE; e5h*GKF  
    KeyCount--; .u`[|: K  
    break; q!K :N?  
   } D-3[# ~MV  
  } |Td+,>,  
 } 4DXbeQs:  
 return bRemoved; CU$kh z"  
} aM^iDJ$>  
)oEVafNsT  
void VerifyWindow() gU9{~-9}  
{ -! \3;/  
 for(int i=0;i<MAX_KEY;i++){ \?:L>-&h8  
  if(hCallWnd!=NULL){ T?9D?u?]  
   if(!IsWindow(hCallWnd)){ *P()&}JK  
    hCallWnd=NULL; NOz3_k  
    HotKey=0; @0`A!5h?u  
    HotKeyMask=0; TFVQfj$r  
    KeyCount--; ,N/@=As9$  
   } D{|qP nE4  
  } E3L?6Qfx>  
 } I8F+Z  
} ] !UYl  
~iw&^p|=K  
BOOL CHookApp::InitInstance() J=V  
{ gmTBT#{6yH  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); wZrFu(_  
 hins=AfxGetInstanceHandle(); xQ?>72grP  
 InitHotkey(); g14*6O:  
 return CWinApp::InitInstance(); #kg`rrF r  
} _iwG'a[`  
4" @<bKx  
int CHookApp::ExitInstance() jA? #!lx_  
{ c=\tf~}^Ms  
 VerifyWindow(); (5a73%>@  
 UnInit(); P{L=u74b{x  
 return CWinApp::ExitInstance(); 7GA8sK  
} Wj{lb_Rj  
UuG%5 ZC  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file F[qXIL)  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) t2&kGf"  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ :WhJDx`j  
#if _MSC_VER > 1000 sW^M  ]  
#pragma once &K[*vyD  
#endif // _MSC_VER > 1000 5 s7BUT  
ROO*/OOd  
class CCaptureDlg : public CDialog Z\$Hg G  
{ uL'f8Pqg  
 // Construction N_t,n^i9>*  
 public: (1/Sf&2i  
  BOOL bTray; OhF55,[  
  BOOL bRegistered; DF%d/a{]  
  BOOL RegisterHotkey(); G1:}{a5i_  
  UCHAR cKey; EIi<g2pM(  
  UCHAR cMask; %lKw+D  
  void DeleteIcon();  %zavSm"  
  void AddIcon(); S :HOlJze  
  UINT nCount; :]"5UY?oF  
  void SaveBmp(); OY*y<>  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4^_6~YP7  
  // Dialog Data BU nujC  
  //{{AFX_DATA(CCaptureDlg) ,5'o>Y  
  enum { IDD = IDD_CAPTURE_DIALOG };  <,.$U\W  
  CComboBox m_Key; D(cD8fn,J  
  BOOL m_bControl; p l)":}/)  
  BOOL m_bAlt; j KU2  
  BOOL m_bShift; "tCI_ Zi;  
  CString m_Path; 6iFlz9XiI  
  CString m_Number; }"Y<<e<z:  
  //}}AFX_DATA I#l}5e5  
  // ClassWizard generated virtual function overrides verI~M$v{  
  //{{AFX_VIRTUAL(CCaptureDlg) kuY^o,u-1e  
 public: YMGy-]!o  
  virtual BOOL PreTranslateMessage(MSG* pMsg); X<ex >sM  
 protected: cJKnB!iL5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support N,t9X7G&  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); m l`xLZN>L  
  //}}AFX_VIRTUAL E4#{&sRT  
  // Implementation \0@DOW22C  
 protected: =g% L$b<i  
  HICON m_hIcon; b3N IFKw  
  // Generated message map functions x/QqG1q  
  //{{AFX_MSG(CCaptureDlg) s|YH_1r  
  virtual BOOL OnInitDialog(); h y rPu_  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0 _!0\d#c  
  afx_msg void OnPaint(); 7KtU\u  
  afx_msg HCURSOR OnQueryDragIcon(); "+DA)K  
  virtual void OnCancel(); /4{WT?j  
  afx_msg void OnAbout(); ITPE2x  
  afx_msg void OnBrowse(); ?o<vmIge  
  afx_msg void OnChange(); z$^d_)  
 //}}AFX_MSG So5/n7  
 DECLARE_MESSAGE_MAP() 7o4E_ .*  
}; O{:{P5  
#endif Y A.&ap  
DJ ru|2  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file B<W}:>3  
#include "stdafx.h" +'H[4g`  
#include "Capture.h" X[z;P!U  
#include "CaptureDlg.h" pj'gTQ),0  
#include <windowsx.h> <O jK $KV  
#pragma comment(lib,"hook.lib") 2OG/0cP  
#ifdef _DEBUG Q0*E&;|  
#define new DEBUG_NEW iGW(2.Z  
#undef THIS_FILE g pciv  
static char THIS_FILE[] = __FILE__; g$(Y\`zw  
#endif y"?`MzcJ0  
#define IDM_SHELL WM_USER+1 (>`_N%_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4^(x)r &(?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); e9acI>^w  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 32GI+NN  
class CAboutDlg : public CDialog s>9I#_4]  
{ Vjs2Yenx  
 public: %<i sdvF  
  CAboutDlg(); b:1B >  
  // Dialog Data 5nPvEN/  
  //{{AFX_DATA(CAboutDlg) kHg|!  
  enum { IDD = IDD_ABOUTBOX }; H4Bt.5O*  
  //}}AFX_DATA 0jp].''RK\  
  // ClassWizard generated virtual function overrides AArLNXzVW  
  //{{AFX_VIRTUAL(CAboutDlg) l&& i`  
 protected: 3h bHS~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >WHajYO"  
  //}}AFX_VIRTUAL v}>g* @  
  // Implementation +=WBH'  
 protected: QW..=}pL  
  //{{AFX_MSG(CAboutDlg) CKw-HgXG  
  //}}AFX_MSG )\U:e:Zae  
  DECLARE_MESSAGE_MAP() }0 ~$^J  
}; /fQcrd7h  
e]<Syrk  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .+7n@Sc  
{ d% EdvM|)  
 //{{AFX_DATA_INIT(CAboutDlg) DLwlA !z  
 //}}AFX_DATA_INIT 'm0WPS/6E  
} 6 `6 I<OJ\  
pbzt8 P[  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) {\Pk;M{Y&  
{ /.:1Da  
 CDialog::DoDataExchange(pDX); [_N1 .}e  
 //{{AFX_DATA_MAP(CAboutDlg) LM<*VhX  
 //}}AFX_DATA_MAP V7$ m.P#uM  
} Yjg$o:M  
3P_.SF  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1@Ba7>%'  
 //{{AFX_MSG_MAP(CAboutDlg) Hc/7x).  
 // No message handlers e`Yj}i*bx]  
 //}}AFX_MSG_MAP Q-)(s  
END_MESSAGE_MAP() NbWEP\dS'z  
,|f=2t+5X  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Y] 1U1 08  
: CDialog(CCaptureDlg::IDD, pParent) \Y,P  
{ (U\o0LI  
 //{{AFX_DATA_INIT(CCaptureDlg) N\|B06X  
  m_bControl = FALSE; 1D%P;eUDp  
  m_bAlt = FALSE; ^|/<e?~I  
  m_bShift = FALSE; '[r:pwE  
  m_Path = _T("c:\\"); dX\OP>  
  m_Number = _T("0 picture captured."); =K@LEZZ'/<  
  nCount=0; zB m~J%  
  bRegistered=FALSE; Vc\g"1 x  
  bTray=FALSE; clDn=k<  
 //}}AFX_DATA_INIT :b9#e g  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 <B%wq>4S  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); b'( AVA  
} Ioe.[&o6B  
s-#@t  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) uNewWtUb(  
{ yCz"~c  
 CDialog::DoDataExchange(pDX); Rd(8j+Q?ps  
 //{{AFX_DATA_MAP(CCaptureDlg) [KUkv  
  DDX_Control(pDX, IDC_KEY, m_Key); Wv>`x?W  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); hGFi|9/-u  
  DDX_Check(pDX, IDC_ALT, m_bAlt); <\*)YKjn/@  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); {9J|\Zz3  
  DDX_Text(pDX, IDC_PATH, m_Path); 28JVW3&)  
  DDX_Text(pDX, IDC_NUMBER, m_Number); s=$xnc}mf  
 //}}AFX_DATA_MAP $%U}k=-  
} $d1ow#ROgy  
xpZ@DK;  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) f*@ :,4@  
//{{AFX_MSG_MAP(CCaptureDlg) )g=mv*9>  
 ON_WM_SYSCOMMAND() 52^3N>X4X  
 ON_WM_PAINT() N+V#=U y  
 ON_WM_QUERYDRAGICON() '3XOU.  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) l[ko)%7V  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) A@M2(?w4  
 ON_BN_CLICKED(ID_CHANGE, OnChange) yO-2.2h  
//}}AFX_MSG_MAP (muJ-~CJk  
END_MESSAGE_MAP() '+_-r'2  
ks$5$,^T2o  
BOOL CCaptureDlg::OnInitDialog() <F`9;WX  
{ 02 FLe*zQ  
 CDialog::OnInitDialog(); HF*~bL  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )fXxkOd  
 ASSERT(IDM_ABOUTBOX < 0xF000); 5hqXMs  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ko.% @Y(=  
 if (pSysMenu != NULL) `B?+1Gv  
 { @MQfeM-@  
  CString strAboutMenu; |yNyk7~  
  strAboutMenu.LoadString(IDS_ABOUTBOX); y**L^uvr  
  if (!strAboutMenu.IsEmpty()) Q3r]T.].h  
  { };2Lrz9<  
   pSysMenu->AppendMenu(MF_SEPARATOR); +VIEDV+   
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); [p\xk{7Y  
  } %AV3eqghCg  
 } UB] tKn  
 SetIcon(m_hIcon, TRUE); // Set big icon depCqz@  
 SetIcon(m_hIcon, FALSE); // Set small icon 9[t-W:3c7  
 m_Key.SetCurSel(0); dyqk[$(  
 RegisterHotkey(); ?n<sN"  
 CMenu* pMenu=GetSystemMenu(FALSE); w8>lWgN  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 7d{xXJ-  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Yy!G?>hC  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); n n[idw  
 return TRUE; // return TRUE unless you set the focus to a control 0o6r3xc;  
} 5 Bcmz'?!  
X:FyNUa  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ;J?fK69%  
{ ^=I[uX-3ue  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) r?`nc6$0|  
 { 7 |Qb}[s  
  CAboutDlg dlgAbout; v&sp;%I6=  
  dlgAbout.DoModal(); cLp9|y0r  
 } i(u zb<  
 else a"+/fC`  
 { j%vxCs>  
  CDialog::OnSysCommand(nID, lParam); HVC|0}  
 } :U1V 2f'l3  
} R^E-9S\@  
(1,4egMpR  
void CCaptureDlg::OnPaint() uxrNkZia  
{ 4pDZ +}p  
 if (IsIconic()) F&/ }x15  
 { TR?jT U  
  CPaintDC dc(this); // device context for painting B_r:daCS:  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); v&^N+>p  
  // Center icon in client rectangle RplcM%YJn  
  int cxIcon = GetSystemMetrics(SM_CXICON); kSJ:4!lFU  
  int cyIcon = GetSystemMetrics(SM_CYICON); X7aj/:fXe  
  CRect rect; hO3C _}  
  GetClientRect(&rect); Y5>'(A>  
  int x = (rect.Width() - cxIcon + 1) / 2; 8BIPEY -I?  
  int y = (rect.Height() - cyIcon + 1) / 2; Xp^>SSt:4  
  // Draw the icon B]D51R\}VE  
  dc.DrawIcon(x, y, m_hIcon); >03JQe_#*L  
 } z ISy\uka  
 else /Wjf"dG}  
 { 7")&njQ/x  
  CDialog::OnPaint(); ^-}3 +YA  
 } lZ+ 1 A0e  
} 7 dG_E]&  
F, 5}3$  
HCURSOR CCaptureDlg::OnQueryDragIcon() yErvgf  
{ %D^j7`Z  
 return (HCURSOR) m_hIcon; :)e/(I]  
} Yh%  
@iz6)2z  
void CCaptureDlg::OnCancel() 87V XVI  
{ `tsqnw  
 if(bTray) ku5g`ho  
  DeleteIcon(); "%t !+E>nr  
  CDialog::OnCancel(); g.EKdvY"%H  
} 1 pzd  
qr/N?,  
void CCaptureDlg::OnAbout() \AR3DDm  
{ 6 dCqS  
 CAboutDlg dlg; HQ|{!P\/?U  
 dlg.DoModal(); 64!V8&Ay  
} 6~+?DIc  
*Oe;JqQkK  
void CCaptureDlg::OnBrowse() Lop=._W  
{ {' |yb  
 CString str; T|nN.  
 BROWSEINFO bi; qo;F]v*pkK  
 char name[MAX_PATH]; Z$@XMq!  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Sytx9`G 5  
 bi.hwndOwner=GetSafeHwnd(); I=`efc]T  
 bi.pszDisplayName=name; |}roR{gc|  
 bi.lpszTitle="Select folder"; jdDcmR  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Xp3cYS*u  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); LYiz:cQh  
 if(idl==NULL) zPoIs @  
  return; z3}4 +~~  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); KWV{wW=-  
 str.ReleaseBuffer(); [[u&=.Au  
 m_Path=str; 8<ri"m,  
 if(str.GetAt(str.GetLength()-1)!='\\') Ib4 8`  
  m_Path+="\\"; $VJ=A<  
 UpdateData(FALSE); >^Z!  
} 8>jd2'v{  
Y-,1&$&  
void CCaptureDlg::SaveBmp() 0r\hX6 k  
{ )%OV|\5#  
 CDC dc; whg?X&j\V  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); K31rt-IIt  
 CBitmap bm; aKCXV[PO   
 int Width=GetSystemMetrics(SM_CXSCREEN); I1(, J  
 int Height=GetSystemMetrics(SM_CYSCREEN); SY2B\TV  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 8:A6Ew&\]O  
 CDC tdc; mY1$N}8fm  
 tdc.CreateCompatibleDC(&dc); 2? 7a\s  
 CBitmap*pOld=tdc.SelectObject(&bm); C44 Dz.rs  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); aI8K*D )@  
 tdc.SelectObject(pOld); `Uw^,r  
 BITMAP btm; P3YG:*  
 bm.GetBitmap(&btm); FCmS3KIa,  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 5k}UXRB?  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Xl%&hM  
 BITMAPINFOHEADER bih; VuW&CnZ  
 bih.biBitCount=btm.bmBitsPixel; (5N&bh`E  
 bih.biClrImportant=0; %lPF q-  
 bih.biClrUsed=0; R\=y/tw0H  
 bih.biCompression=0; :FdV$E]]<  
 bih.biHeight=btm.bmHeight; *K\/5Fzl  
 bih.biPlanes=1; UkL'h&J~  
 bih.biSize=sizeof(BITMAPINFOHEADER); f-6E>  
 bih.biSizeImage=size; `}u~nu<  
 bih.biWidth=btm.bmWidth; -OuMC&  
 bih.biXPelsPerMeter=0; [XQoag;!  
 bih.biYPelsPerMeter=0; #PmF@ CHR  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 2{h9a0b  
 static int filecount=0; %P9Zx!i>  
 CString name; !NYc!gYD  
 name.Format("pict%04d.bmp",filecount++); *$_<| g)9  
 name=m_Path+name; VG\ER}s&P  
 BITMAPFILEHEADER bfh; 6i \b&  
 bfh.bfReserved1=bfh.bfReserved2=0; Da8qR+*x  
 bfh.bfType=((WORD)('M'<< 8)|'B'); GL1!Z3  
 bfh.bfSize=54+size; 66%kq [  
 bfh.bfOffBits=54; \d%SC<s  
 CFile bf; aX1|&erI  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #tBbvs+%  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); F+AShh  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); y#Ch /Jg?|  
  bf.WriteHuge(lpData,size); (N43?iv(  
  bf.Close(); H1=R(+-s  
  nCount++; uBs[[9je(  
 } kF.PLn'iS  
 GlobalFreePtr(lpData); ?P`]^#  
 if(nCount==1) te'<xfG  
  m_Number.Format("%d picture captured.",nCount); 4aZsz,=  
 else e}}xZ%$4|  
  m_Number.Format("%d pictures captured.",nCount); n|L.d BAs]  
  UpdateData(FALSE); obX|8hTL%  
} Md_\9G .e  
G(4:yK0  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) G#CWl),=  
{ Vo(d)"m?  
 if(pMsg -> message == WM_KEYDOWN) +]  |J  
 { .)u,sYZA|  
  if(pMsg -> wParam == VK_ESCAPE) |)IN20  
   return TRUE; T.W/S0#j3  
  if(pMsg -> wParam == VK_RETURN) Jo h&Ay  
   return TRUE; K#";!  
 } 88)0Xi|]KP  
 return CDialog::PreTranslateMessage(pMsg); WohK,<Or  
} )CXJRo`j0  
|g 4!Yd  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) c#`Z[  
{ S3j/(BG  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ m(Bv}9  
  SaveBmp(); })bTQj7  
  return FALSE; 0  x"3  
} f+$/gz  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ M6|Q~8$  
 CMenu pop; c6dL S  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); /tP"r}l   
 CMenu*pMenu=pop.GetSubMenu(0); !OWV* v2  
 pMenu->SetDefaultItem(ID_EXITICON); 4y21v|(9  
 CPoint pt; vC J  
 GetCursorPos(&pt); OBN]bvCJ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); n2Ycq&O  
 if(id==ID_EXITICON) Nc]oA Y  
  DeleteIcon(); Yq) wE|k/  
 else if(id==ID_EXIT) S)$ES6]9/  
  OnCancel(); v=SC*  
 return FALSE; iQin|$F_O  
} -\>Bphu,y  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ";",r^vr\  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Fz)z&WT  
 AddIcon(); ~"}-cl,  
 return res; {v]A`u)  
} c+|,2e 0T  
a50{gb#  
void CCaptureDlg::AddIcon() zc,fJM  
{ R0\E?9P  
 NOTIFYICONDATA data; U#,2et6  
 data.cbSize=sizeof(NOTIFYICONDATA); ;U}lh~e11  
 CString tip; t]" 3vE>  
 tip.LoadString(IDS_ICONTIP); t91v%L   
 data.hIcon=GetIcon(0); }QG6KJh_%  
 data.hWnd=GetSafeHwnd(); HHoh//(\  
 strcpy(data.szTip,tip); Z:9"7^+  
 data.uCallbackMessage=IDM_SHELL; WRFzb0;01  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; D,1S-<  
 data.uID=98; uj;-HN)6  
 Shell_NotifyIcon(NIM_ADD,&data); <tgJ-rnL  
 ShowWindow(SW_HIDE); [al$7R&  
 bTray=TRUE; 4(  ^Ht  
} (D{9~^EO>a  
yHk/8  
void CCaptureDlg::DeleteIcon() )0RH"#, 2L  
{ pt|u?T_+  
 NOTIFYICONDATA data; o& $Fc8bH  
 data.cbSize=sizeof(NOTIFYICONDATA); {Sd{|R_  
 data.hWnd=GetSafeHwnd();  [Fr.ik  
 data.uID=98; LYavth`@h  
 Shell_NotifyIcon(NIM_DELETE,&data); M_UhFY='  
 ShowWindow(SW_SHOW); OES+BXGX  
 SetForegroundWindow(); i>q]U:U  
 ShowWindow(SW_SHOWNORMAL); g;eMsoJG  
 bTray=FALSE; {o5E#<)  
} Ck(D: % ~s  
!lL21C6g+  
void CCaptureDlg::OnChange() E@P8-x'i  
{ "i4@'`r  
 RegisterHotkey(); d^WVWk K  
} zn>*^h0B  
Ry[VEn>C1  
BOOL CCaptureDlg::RegisterHotkey() x@Z?DS$)  
{ 86@"BNnTh  
 UpdateData(); )aOg_*~  
 UCHAR mask=0; srJ,Jr(  
 UCHAR key=0; ;wgm 'jr  
 if(m_bControl) "DfvoQP  
  mask|=4; `gD'q5.z;3  
 if(m_bAlt) _~=X/I R  
  mask|=2; ix$?/GlL  
 if(m_bShift) # TC x8]F  
  mask|=1; do7 [Nj  
  key=Key_Table[m_Key.GetCurSel()]; #U(dleT8  
 if(bRegistered){ 6 }qNH29  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); )DfmO  
  bRegistered=FALSE; N 0&h5  
 } Yep(,J~'  
 cMask=mask; 6#KRI%adw`  
 cKey=key; 2\lUaC#E  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); RBJgQ<j8  
 return bRegistered; .P9ALJP(b  
} y7ijT='8  
m(XcPb  
  四、小结 X@5!I+u\L  
XQ%*U=)s  
  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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