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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: ?@DNsVwb  
  oq. r\r  
  一、实现方法 x2m]Us@LIU  
LipxAE?O  
  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: 9~~UM<66W  
OX^3Q:Z=  
#pragma data_seg("shareddata") s/h7G}Mu  
HHOOK hHook =NULL; //钩子句柄 wVE:X3Ei  
UINT nHookCount =0; //挂接的程序数目 M~p=#V1D  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 (Q_2ODKo  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 K$ AB} Fvc  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 1`QsW&9=b  
static int KeyCount =0; lQL:3U0DjU  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 tr=@+WHp  
#pragma data_seg() ]u0Jd#@  
a_{6Qdl  
  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。 1eD.:_t4  
:<%vE!$  
  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: @)b^^Fp  
W&KM/9d  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR S(w\ZC  
cKey,UCHAR cMask) !W~<q{VTs  
{ sOz sY7z3Z  
 BOOL bAdded=FALSE; nvH|Ngg Q  
 for(int index=0;index<MAX_KEY;index++){ ) Fx ?%  
  if(hCallWnd[index]==0){ 3e 73l  
   hCallWnd[index]=hWnd; uy9!qk  
   HotKey[index]=cKey; ]Uh 1l.O  
   HotKeyMask[index]=cMask; 11{y}J  
   bAdded=TRUE; !^L-T?y.2  
   KeyCount++; 8&."uEOOU  
   break; Dft%ip2  
  } u w"*zBxl  
 } o%qkqK1  
 return bAdded; Ia7D F'  
} c{4R*|^  
//删除热键 OD|1c6+X  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,ux+Qz5(  
{ ]7vf#1i<  
 BOOL bRemoved=FALSE; 7=3O^=Q ^Q  
 for(int index=0;index<MAX_KEY;index++){ hy!6g n  
  if(hCallWnd[index]==hWnd){ n|C|&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ o_rtH|ntX5  
    hCallWnd[index]=NULL; 6pm~sD  
    HotKey[index]=0; &D*8l?A/1f  
    HotKeyMask[index]=0; 9^\hmpP@D  
    bRemoved=TRUE; N"1 QX6  
    KeyCount--; Q.ukY@L.'  
    break; 4U{m7[  
   } +*.1}r&  
  } q~O>a0f0  
 } 75AslL?t  
 return bRemoved; 61|B]ei/  
} mf2Mx=oy  
p:tN642  
+>#e=nH  
  DLL中的钩子函数如下: t3>$|}O]t  
y\z > /q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) O^NP0E  
{ s.rT]  
 BOOL bProcessed=FALSE; >UWStzH<  
 if(HC_ACTION==nCode) De]^&qw(  
 { PpFsp( )x  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 1Is%]6  
   switch(wParam) Pb4q`!  
   {  wko2M[  
    case VK_MENU: RJPcn)@l  
     MaskBits&=~ALTBIT; aTClw<6}  
     break; uP6-cs  
    case VK_CONTROL: +* D4(  
     MaskBits&=~CTRLBIT; >a@>N  
     break; 9U'[88  
    case VK_SHIFT: pl\b-  
     MaskBits&=~SHIFTBIT; MS{{R +&  
     break; 0'@u!m?  
    default: //judge the key and send message ohsH2]C  
     break; Pi){h~B>  
   } VA2<r(y~(  
   for(int index=0;index<MAX_KEY;index++){ @h(!<Ux_  
    if(hCallWnd[index]==NULL) f3t. T=S  
     continue; 7E(%9W6P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <r;o6>+  
    { ~p^7X2% !  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `:4MMr91  
     bProcessed=TRUE; QkE,T0,/?h  
    } `p1DaV  
   } @'gl~J7  
  } k/bque  
  else if((lParam&0xc000ffff)==1){ //有键按下 EzpwGNfz}  
   switch(wParam) a2X h>{  
   { Fx5ZwT t  
    case VK_MENU: OpqNEo\  
     MaskBits|=ALTBIT; tN}c0'H  
     break; `M)E*G  
    case VK_CONTROL: \k4pK &b  
     MaskBits|=CTRLBIT; 5qiI.)  
     break; IfB/O.;Kz  
    case VK_SHIFT: 5m`[MBt2g  
     MaskBits|=SHIFTBIT; x< S\D&  
     break; <A{y($  
    default: //judge the key and send message "*bk{)dz}  
     break; T`Ro)ORC#  
   } P}l#VJWp  
   for(int index=0;index<MAX_KEY;index++){ 2Y;!$0_rv  
    if(hCallWnd[index]==NULL) ZOn_dYjC  
     continue; H!. ZH(asY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xKb"p4k9d  
    { yZ~b+=UM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Y'JL(~|  
     bProcessed=TRUE; ~v\hIm3=m  
    } Xy!&^C` J`  
   } (Com,  
  } - `4Ty*K  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 OM{Dq|  
   for(int index=0;index<MAX_KEY;index++){ _k|g@"  
    if(hCallWnd[index]==NULL) e{JVXc[D  
     continue; .HCaXFW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >[8#hSk  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); O8[k_0@  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 #]X2^ND4 7  
   } 9N1#V K  
  } (Xj.iP  
 } \ =Nm5:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); f)U6p  
} J[6VBM.Y  
T g{UK  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 0+|>-b/%  
IhwN],-V  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >fg4x+0%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !3 ?yG  
sxk*$jO[]  
  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: ,m3":{G:t.  
;.AV;C"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |mvM@V;^8{  
{ tJz^DXqAc  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ]'e A O  
 { "]UIz_^'`U  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 N|$5/bV  
  SaveBmp(); 19) !$Hl  
  return FALSE; kJ__:rS(T_  
 } *k4+ioFnKE  
 …… //其它处理及默认处理 jNIUsM 8e  
} ([tG y  
s{B_N/^  
q^%5HeV 2  
  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。  Zsgi{  
T(gg>_'jh  
  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。 EzUPah  
cPJ7E  
  二、编程步骤 2n(ItA  
C6CGj8G  
  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"; UFL0 K  
OFQ{9  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; VD9J}bgJ  
ze ?CoDx2  
  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; n-W?Z'H{r  
xp(mB7;:  
  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; K: 4P ;ApI  
M",];h(I6(  
  5、 添加代码,编译运行程序。 \DaLHC~  
c9|I4=_K  
三、程序代码 EL"4E',  
XA?WUR[e  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 98=XG1sQ@  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) We|-5  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ vmMV n-\#  
#if _MSC_VER > 1000 Xa>}4j.  
#pragma once Up'."w_zE  
#endif // _MSC_VER > 1000 +H[Q~P8'[  
#ifndef __AFXWIN_H__ 2=Jmi?k  
#error include 'stdafx.h' before including this file for PCH C9GU6Ao  
#endif [rc'/@L  
#include "resource.h" // main symbols # .~.UHt  
class CHookApp : public CWinApp '8L(f w{k  
{ juR  
 public: q;IhLBl'  
  CHookApp(); 9*f2b.Aj  
  // Overrides ~T;K-9R  
  // ClassWizard generated virtual function overrides jt/l,=9YK  
  //{{AFX_VIRTUAL(CHookApp) 9DmSs=A  
 public: s8{-c^G:R  
  virtual BOOL InitInstance(); .&Y,D-h}7|  
  virtual int ExitInstance(); >\RDQ%z  
  //}}AFX_VIRTUAL N"&$b_u[  
  //{{AFX_MSG(CHookApp) Feh"!k <6k  
  // NOTE - the ClassWizard will add and remove member functions here. ]j72P  
  // DO NOT EDIT what you see in these blocks of generated code ! ,o4r,.3[s  
  //}}AFX_MSG (R,NV3m?w  
  DECLARE_MESSAGE_MAP() SIj6.RK  
}; 4S^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); |+>%o.M&i  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); nl.~^CP  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $,p.=j;P  
BOOL InitHotkey(); X+/{%P!w  
BOOL UnInit(); nomu$|I  
#endif uPM8GIvZX.  
b/T20F{W\o  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~+7ad$   
#include "stdafx.h" *pDXcURw  
#include "hook.h" QJ[(Y@ O6a  
#include <windowsx.h> ?3.(Vqwog  
#ifdef _DEBUG l2z`<2mp  
#define new DEBUG_NEW 8L%%eM_O  
#undef THIS_FILE Q>cL?ie  
static char THIS_FILE[] = __FILE__; 1v>  
#endif bjU 2UcI"<  
#define MAX_KEY 100 e);bF>.~  
#define CTRLBIT 0x04 =d:R/Z%,  
#define ALTBIT 0x02 ?{y:s!!  
#define SHIFTBIT 0x01 >DSNKU+j  
#pragma data_seg("shareddata") Dwm@E\^ihm  
HHOOK hHook =NULL; /zChdjz  
UINT nHookCount =0; ~}hba3&b;#  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey N]3-L`t  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT '8]|E  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey AH"g^ gw~T  
static int KeyCount =0; f\U?:8 3  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift e'}ePvN  
#pragma data_seg() l5":[C$  
HINSTANCE hins; V{7lltu  
void VerifyWindow(); PV5TG39qQ  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) V{ 4i$'  
//{{AFX_MSG_MAP(CHookApp) WHhR )$zC  
// NOTE - the ClassWizard will add and remove mapping macros here. E.5*Jr=J  
// DO NOT EDIT what you see in these blocks of generated code! ~;!i)[-  
//}}AFX_MSG_MAP GU;TK'Yy?  
END_MESSAGE_MAP() QZ:]8MHl]  
FJ3:}r6 "  
CHookApp::CHookApp() M]%!n3Fb  
{ 1I:"0("}  
 // TODO: add construction code here, / h 2*$  
 // Place all significant initialization in InitInstance ~T;a jvJ  
} ;XKo44%  
h4$OXKme?  
CHookApp theApp; )-TeDIfm  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) j L>I5f  
{ a!hI${Xn  
 BOOL bProcessed=FALSE; softfjl&l  
 if(HC_ACTION==nCode) SevfxR  
 { g4.'T51  
  if((lParam&0xc0000000)==0xc0000000){// Key up J*^,l`C/  
   switch(wParam) qxg7cj2  
   { goBKr: &]w  
    case VK_MENU: >%jEo'0;_  
     MaskBits&=~ALTBIT; )ZQ9a4%  
     break; &t9XK8S  
    case VK_CONTROL: jl 30\M7  
     MaskBits&=~CTRLBIT; #h #mOJ5  
     break; mPw56>  
    case VK_SHIFT: !4b; >y=m  
     MaskBits&=~SHIFTBIT; |({UV-`  
     break; ,h5-rw'  
    default: //judge the key and send message 21)-:rS  
     break; ;#6<bV  
   } 5qeS|]^`  
   for(int index=0;index<MAX_KEY;index++){ >X\s[d&(  
    if(hCallWnd[index]==NULL) j4 &  
     continue; c}I8!*\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Wj f>:\ w  
    { 4Q`=t &u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); V.P5v {  
     bProcessed=TRUE; R>YMGUH~w  
    } f@xfb ie !  
   } k1LtqV  
  } 4 L~;>]7  
  else if((lParam&0xc000ffff)==1){ //Key down )2<B$p  
   switch(wParam) X~Rk ,d3  
   { 71n uTE%!  
    case VK_MENU: i"\AyKiJ  
     MaskBits|=ALTBIT; P/1UCITq}  
     break; |<+|Du1  
    case VK_CONTROL: L]L~TA<D9i  
     MaskBits|=CTRLBIT; @e?[oojrM  
     break; u`H@Q&(^wa  
    case VK_SHIFT: LP m# 3U  
     MaskBits|=SHIFTBIT; OV@h$fg  
     break; l]58P  
    default: //judge the key and send message Z+h7 0,|  
     break; ja,L)b:  
   } UV *tO15i  
   for(int index=0;index<MAX_KEY;index++) xjn8)C  
   { zN8V~M;  
    if(hCallWnd[index]==NULL) AN:RY/ %Wo  
     continue; <DlanczziF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (k)gZD9~{?  
    { Pu\DYP: (  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]Buk9LTe  
     bProcessed=TRUE; lWyP[>*  
    } @)juP- o%  
   } SUnmp  
  } r1az=$  
  if(!bProcessed){ Cak/#1  
   for(int index=0;index<MAX_KEY;index++){ C&s }m0R  
    if(hCallWnd[index]==NULL) |uBot#K|  
     continue; O^="T^J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  KHs{/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Mbi+Vv-  
   }  ~bWWu`h  
  } z1@sEfk>  
 } JjTzq2'%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); DRg ~HT  
} Tdmo'"m8z_  
,%b1 ]zZQ  
BOOL InitHotkey() (.nJT"&  
{ 3TvhOC>yG  
 if(hHook!=NULL){ Fi3(glgd-  
  nHookCount++; ht74h  
  return TRUE; d&R\7)0  
 } 7J!d3j2TR  
 else g]#zWTw(   
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ?[4khQt  
  if(hHook!=NULL) =iN_Ug+  
   nHookCount++; b Ho?Rw!.  
  return (hHook!=NULL); RKJWLofX&  
} &=yqWW?  
BOOL UnInit() eiSO7cGy  
{ d8q$&(]<  
 if(nHookCount>1){ fjZveH0  
  nHookCount--; HgBEV  
  return TRUE; qx<zX\qI6n  
 } N+@@EOmH  
 BOOL unhooked = UnhookWindowsHookEx(hHook); nF[eb{GR`  
 if(unhooked==TRUE){ Z a y'/b  
  nHookCount=0; qA_DQ):  
  hHook=NULL; _2n/vF;I+_  
 } cZK?kz_Y  
 return unhooked; n,'AFb4AF  
} ="TOa"Zk  
jw%FZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >_% g8T'  
{ P9cI{RI  
 BOOL bAdded=FALSE; z^GGJu%vjr  
 for(int index=0;index<MAX_KEY;index++){ {Ll8@'5  
  if(hCallWnd[index]==0){ x)sDf!d4bi  
   hCallWnd[index]=hWnd; $bC!T  
   HotKey[index]=cKey; zmS-s\$,  
   HotKeyMask[index]=cMask; Mn{Rg>X  
   bAdded=TRUE; 5lA 8e  
   KeyCount++; ^@w1Z{:  
   break; _ ~$0cj<  
  } =ir;m  
 } XV9'[V  
 return bAdded; }sNZQ89V*v  
} eDZ3SIZ  
X1~A "sW[  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) x=r6vOj  
{ uRcuy/CY  
 BOOL bRemoved=FALSE; 7Qztc?XK  
 for(int index=0;index<MAX_KEY;index++){ LZbHK.G=  
  if(hCallWnd[index]==hWnd){ "'dC>7*<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >t<R6f_Q0  
    hCallWnd[index]=NULL; qpH-P8V   
    HotKey[index]=0; (Jr;:[4XC  
    HotKeyMask[index]=0; bL#TR;*]  
    bRemoved=TRUE; fOfz^W  
    KeyCount--; Fi=8B&j  
    break; O9IjU10:  
   } MZF ;k$R  
  } \z?;6A  
 } O6 J<Lqgh  
 return bRemoved; (c7{dYV  
} VrL>0d&d  
g/Nj|:3  
void VerifyWindow() 5DBd [u3  
{ J_Xf:Mz-  
 for(int i=0;i<MAX_KEY;i++){ (Q} ijwj  
  if(hCallWnd!=NULL){ !8M'ms>s=  
   if(!IsWindow(hCallWnd)){ 'WgwLE_  
    hCallWnd=NULL;  o|im  
    HotKey=0; o) ?1`7^BA  
    HotKeyMask=0; ] ]-0RJ=S?  
    KeyCount--; _C#( )#  
   } H~K2`Cr)4  
  } <NsT[r~C  
 } Nfvg[c  
} 6$;)CO!h  
7i8qB462  
BOOL CHookApp::InitInstance() HpC4$JMm  
{ +FK<j;}C7  
 AFX_MANAGE_STATE(AfxGetStaticModuleState());  } R6h  
 hins=AfxGetInstanceHandle(); j_<n~ri-  
 InitHotkey(); D[y|y 3F  
 return CWinApp::InitInstance(); F!t13%yeu?  
} laJ%fBWmbi  
w~-d4MNM  
int CHookApp::ExitInstance() 9!C?2*>A P  
{ Z'kYf   
 VerifyWindow(); bW3o%srxa  
 UnInit(); wZb@VG}%  
 return CWinApp::ExitInstance(); a6#PZ!1  
} ^aoLry&i=  
^%@.Vvz<  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file  ?wY.B  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) gJv^v`X  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ )ciHY6  
#if _MSC_VER > 1000 |0%UM}  
#pragma once Jxp'.oo[  
#endif // _MSC_VER > 1000 !XC7F UO  
?P]md9$(+e  
class CCaptureDlg : public CDialog 1mM52q.R4  
{ |B.d7@{mM  
 // Construction q|2C>{8  
 public: ,DZLEsFM  
  BOOL bTray; bGa":|}F  
  BOOL bRegistered; E6)mBAE  
  BOOL RegisterHotkey(); 9R3=h5Y  
  UCHAR cKey; u^p[zepW\  
  UCHAR cMask; S"z4jpqn3  
  void DeleteIcon(); RO8Ynm2 <  
  void AddIcon(); U.x.gZRo[  
  UINT nCount; V(0[QA  
  void SaveBmp(); M 4?3l  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor V> SA3  
  // Dialog Data tB7aHZ|  
  //{{AFX_DATA(CCaptureDlg) [J 3;U6  
  enum { IDD = IDD_CAPTURE_DIALOG }; =@MKU  
  CComboBox m_Key; 1 j8,Zrg1  
  BOOL m_bControl; ,:,|A/U  
  BOOL m_bAlt; 9] \vw  
  BOOL m_bShift; 5+Ut]AL5  
  CString m_Path; \ed(<e>  
  CString m_Number; NQD b;5:  
  //}}AFX_DATA n-_w0Y  
  // ClassWizard generated virtual function overrides ~?r6Ax-R  
  //{{AFX_VIRTUAL(CCaptureDlg) eL!6}y}W  
 public: df\>-Hl  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9tQk/niMM5  
 protected: Z%=E/xT  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support n]!H,Q1,T  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ~3 (>_r  
  //}}AFX_VIRTUAL ha 5\T'  
  // Implementation _,Y79 b6  
 protected: hT#mM*`  
  HICON m_hIcon; H[Cn@XE  
  // Generated message map functions @gz?T;EC  
  //{{AFX_MSG(CCaptureDlg) 4|thDb)]  
  virtual BOOL OnInitDialog(); CcQ|0  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); hSH-Ck@Qy  
  afx_msg void OnPaint(); 'fsOKx4Z  
  afx_msg HCURSOR OnQueryDragIcon(); ".4^?d_^VF  
  virtual void OnCancel(); rz*Jmn b  
  afx_msg void OnAbout(); Ek0.r)Nw  
  afx_msg void OnBrowse(); {n'}S(  
  afx_msg void OnChange(); uy~j$lrn  
 //}}AFX_MSG v\C+G[MV 7  
 DECLARE_MESSAGE_MAP() E{J;-+t  
}; F\;1:y~1  
#endif tWuQKN`_  
qE[}Cf]X  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file jF8ld5|_|  
#include "stdafx.h" @P?*<b{  
#include "Capture.h" ^D)C|T  
#include "CaptureDlg.h" %94"e7Hy  
#include <windowsx.h> #oI`j q  
#pragma comment(lib,"hook.lib") S;~_9i]upe  
#ifdef _DEBUG Jt"Wtr  
#define new DEBUG_NEW "mA/:8`Q  
#undef THIS_FILE 9q?gmAn.  
static char THIS_FILE[] = __FILE__; e{=$4F  
#endif ]g :ZokU  
#define IDM_SHELL WM_USER+1 C{-pVuhK+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3@PVUJ0B|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Kt(p|  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 04:Dbt~=?p  
class CAboutDlg : public CDialog *KAuyJr  
{ rxA<\h,A  
 public: P^UcpU,  
  CAboutDlg(); 7w|s8B  
  // Dialog Data #<{MtK_  
  //{{AFX_DATA(CAboutDlg) M=%p$\x  
  enum { IDD = IDD_ABOUTBOX }; 6._):[_2  
  //}}AFX_DATA .jU9{;[  
  // ClassWizard generated virtual function overrides hS  Sq=(S  
  //{{AFX_VIRTUAL(CAboutDlg) w]}v m-  
 protected: .1;?#t]ZV  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )I@iW\`7  
  //}}AFX_VIRTUAL xS'So7:h  
  // Implementation [Pay<]c6g  
 protected: =*pu+o,?  
  //{{AFX_MSG(CAboutDlg) n~Ix8|S h  
  //}}AFX_MSG ^]HwStn&=  
  DECLARE_MESSAGE_MAP() u|E,Wy1  
}; d hy=x  
+;T%7j"wz  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Z:}^fZP  
{ 4(NI-|q0  
 //{{AFX_DATA_INIT(CAboutDlg) yd k  
 //}}AFX_DATA_INIT @gd-lcMYW  
} 4'M#m|V  
A<&9   
void CAboutDlg::DoDataExchange(CDataExchange* pDX) HDYf^mcW  
{ kI]1J  
 CDialog::DoDataExchange(pDX); w[XW>4x K  
 //{{AFX_DATA_MAP(CAboutDlg) <7XdT  
 //}}AFX_DATA_MAP b\?`721BG  
} .*,ZcO  
-{?Rq'H  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) _v\QuI6  
 //{{AFX_MSG_MAP(CAboutDlg) +x1sV*S  
 // No message handlers kDrGl{U}  
 //}}AFX_MSG_MAP <mxUgU  
END_MESSAGE_MAP() Ur@3_F  
Aq-v3$XL  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) DE[y&]/C{  
: CDialog(CCaptureDlg::IDD, pParent) pP .   
{ -M4#dHR_!  
 //{{AFX_DATA_INIT(CCaptureDlg) E ?-K_p  
  m_bControl = FALSE; :?,& u,8  
  m_bAlt = FALSE; A /MOY@%G  
  m_bShift = FALSE; tU(6%zvR  
  m_Path = _T("c:\\"); @U}UCG7+  
  m_Number = _T("0 picture captured."); ny}?+&K  
  nCount=0; -`( :L[  
  bRegistered=FALSE; nv={.H  
  bTray=FALSE; JO$0Z  
 //}}AFX_DATA_INIT X@ss d  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Y\rKw!u_!  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); R .,w`<<  
} '{|87kI  
Cs$g]&a  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) t6tqv  
{ #(7OvW+y  
 CDialog::DoDataExchange(pDX); `f (!i mN  
 //{{AFX_DATA_MAP(CCaptureDlg) *]rV,\z:  
  DDX_Control(pDX, IDC_KEY, m_Key); o,d:{tt  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 90q*V%cS  
  DDX_Check(pDX, IDC_ALT, m_bAlt); [wEx jLW  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); BjShK+Y  
  DDX_Text(pDX, IDC_PATH, m_Path); )_BteLo-  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ?VJ Fp^Ra  
 //}}AFX_DATA_MAP )TLDNpH?J  
} uJ%ql5XDV  
=Ij;I~  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Uc/%4Gx   
//{{AFX_MSG_MAP(CCaptureDlg) v;OA hFr|  
 ON_WM_SYSCOMMAND() I;No++N0  
 ON_WM_PAINT() 3[c54S+(U  
 ON_WM_QUERYDRAGICON() ^Tl|v'   
 ON_BN_CLICKED(ID_ABOUT, OnAbout) %T&kK2d;  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) }5A?WH_  
 ON_BN_CLICKED(ID_CHANGE, OnChange) yVW)DQ 4?  
//}}AFX_MSG_MAP ;;2s{{(R  
END_MESSAGE_MAP() <|{=O9  
-1@kt<Es  
BOOL CCaptureDlg::OnInitDialog() my Po&"_ x  
{ 0_ ;-QAd  
 CDialog::OnInitDialog(); |{$Vk%cUE  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); R8mL|Vb|  
 ASSERT(IDM_ABOUTBOX < 0xF000); H6L`239u  
 CMenu* pSysMenu = GetSystemMenu(FALSE); {3l] /X3  
 if (pSysMenu != NULL) #jnb6v=5v  
 { cc@y  
  CString strAboutMenu; gG#M-2P  
  strAboutMenu.LoadString(IDS_ABOUTBOX); LE Y$St  
  if (!strAboutMenu.IsEmpty()) |'Jz(dv[  
  { 4kIy4x'*  
   pSysMenu->AppendMenu(MF_SEPARATOR); \KTX{qI"f  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); oR5'g7?  
  } FN G]  
 } um[.r,++  
 SetIcon(m_hIcon, TRUE); // Set big icon 0Rj_l:d=  
 SetIcon(m_hIcon, FALSE); // Set small icon d !>PqPo  
 m_Key.SetCurSel(0); lLnD%*03  
 RegisterHotkey(); i`X/d=  
 CMenu* pMenu=GetSystemMenu(FALSE); ZM\Z2L]n  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); WzF/wzR  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); iZ&CE5+  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); %kF6y_h`  
 return TRUE; // return TRUE unless you set the focus to a control +"Ka #Z  
} d}Q;CF3 m:  
i7iL[+f]Q  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) xw`Pq6  
{ gx3arVa  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) <_h  
 { "zv?qS  
  CAboutDlg dlgAbout; hivWQ$6%  
  dlgAbout.DoModal(); X'O3)Yg  
 } _/hWzj=q  
 else W<\KRF$S;  
 { Fvg>>HVu  
  CDialog::OnSysCommand(nID, lParam); o4U9jU4<"  
 } 3d[fP#NY7  
} gd2cwnP  
K1jE_]@Z  
void CCaptureDlg::OnPaint() iOw'NxmY  
{ GP1b/n3F1  
 if (IsIconic()) }DoNp[`  
 { L_Z>*s&  
  CPaintDC dc(this); // device context for painting q5Z]Z.%3O  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]5wc8Kh"  
  // Center icon in client rectangle _pL:dKfy7  
  int cxIcon = GetSystemMetrics(SM_CXICON); t}+P|$[  
  int cyIcon = GetSystemMetrics(SM_CYICON); \#L}KW  
  CRect rect; (r.[b  
  GetClientRect(&rect); bIR7g(PJ.b  
  int x = (rect.Width() - cxIcon + 1) / 2; Rkgpa/te"  
  int y = (rect.Height() - cyIcon + 1) / 2; rQCj^=cf;~  
  // Draw the icon Ean #>h  
  dc.DrawIcon(x, y, m_hIcon); ht)J#Di  
 } ',~,hJ0  
 else I~|.Re9a  
 { xzh`q  
  CDialog::OnPaint(); M/T ll]\|  
 } )ui]vS:>  
} q9|'!m5K  
`5:b=^'D /  
HCURSOR CCaptureDlg::OnQueryDragIcon() RAPR-I;{  
{ mSr(PIH{\  
 return (HCURSOR) m_hIcon; n2cb,b/7  
} '_>8_  
'Y `or14E  
void CCaptureDlg::OnCancel() DY1UP (y  
{ D&#wn.0|E  
 if(bTray) 'b~,/lZd  
  DeleteIcon(); DJR_"8  
  CDialog::OnCancel(); |U)M.\h  
} 8(]*J8/wt  
E0G"B' x  
void CCaptureDlg::OnAbout() 0.!_k )tu  
{ R `  
 CAboutDlg dlg; 5Sl vCL  
 dlg.DoModal(); Mh3Tfp  
} sN"<baZ  
HHzAmHt  
void CCaptureDlg::OnBrowse() `|(S]xPHM  
{ ^Y,nv,gYn  
 CString str; W"$sN8K>)  
 BROWSEINFO bi; Y`3V&8X  
 char name[MAX_PATH]; 8#L V oR  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); vY)5<z&  
 bi.hwndOwner=GetSafeHwnd(); *3 8 u ~n  
 bi.pszDisplayName=name; *MC+i$  
 bi.lpszTitle="Select folder"; qjDt6B^RO  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; KDxqz$14 -  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?h\fwF3  
 if(idl==NULL) mBN+c9n/  
  return; =S#9\W&6Q  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 9?]69O  
 str.ReleaseBuffer(); Y].,}}9k  
 m_Path=str; 8}C_/qeM  
 if(str.GetAt(str.GetLength()-1)!='\\') , Ox$W  
  m_Path+="\\"; Q,v/]bXd  
 UpdateData(FALSE); []OmztB  
} gxPu/VD4  
%[B^b)2  
void CCaptureDlg::SaveBmp() /xq^]0xy  
{ \:y oS>G  
 CDC dc; QNWGUg4*&  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); z* k(` '  
 CBitmap bm; h>k[  
 int Width=GetSystemMetrics(SM_CXSCREEN); < #FxI  
 int Height=GetSystemMetrics(SM_CYSCREEN); Nux  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 4]G J+a  
 CDC tdc; YpJJ]Rszg  
 tdc.CreateCompatibleDC(&dc); VDT.L,9  
 CBitmap*pOld=tdc.SelectObject(&bm); tzJ7wXRr  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ,i)wS1@  
 tdc.SelectObject(pOld); zCji]:  
 BITMAP btm; 18nT Iz_  
 bm.GetBitmap(&btm); @k+ K_gR  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /Ixv{H)H  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); f*o+g:]3  
 BITMAPINFOHEADER bih; L _D#  
 bih.biBitCount=btm.bmBitsPixel; z=/&tRe W  
 bih.biClrImportant=0; YC[c QX  
 bih.biClrUsed=0; 7D&O5Z=%+  
 bih.biCompression=0; FRhHp(0}5  
 bih.biHeight=btm.bmHeight; t03X/%H  
 bih.biPlanes=1; 3FY87R   
 bih.biSize=sizeof(BITMAPINFOHEADER); j[CXIz?c  
 bih.biSizeImage=size; <c3Te$.  
 bih.biWidth=btm.bmWidth; oZ5 ,y+L4  
 bih.biXPelsPerMeter=0; L9{y1'')  
 bih.biYPelsPerMeter=0; Y[!s:3\f  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); CFXr=.yz  
 static int filecount=0; 4v.{C"M  
 CString name; jZr"d*Y  
 name.Format("pict%04d.bmp",filecount++); ]$~\GE^  
 name=m_Path+name; I >aKa  
 BITMAPFILEHEADER bfh; dOX"7kZ  
 bfh.bfReserved1=bfh.bfReserved2=0; ?k`UQi]Q  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 2Q=I`H _  
 bfh.bfSize=54+size; ULH<FDot  
 bfh.bfOffBits=54; u.ej<Lo  
 CFile bf; m`BE{%  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ |BBo  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [>D5(O  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); |"g+p)A  
  bf.WriteHuge(lpData,size); R0~w F>  
  bf.Close(); !LM9  
  nCount++; ]w0_!Z&  
 } [2{2w68D!  
 GlobalFreePtr(lpData); Gv&%cq1  
 if(nCount==1) ka/>jV"  
  m_Number.Format("%d picture captured.",nCount); )LAG$Cn  
 else qh|fq b  
  m_Number.Format("%d pictures captured.",nCount); 6t=)1T  
  UpdateData(FALSE); .WLwAL  
} u-M Td  
BD- c<K"  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) o-<XR9,N*  
{ ~6=aoF5"3?  
 if(pMsg -> message == WM_KEYDOWN) a$K6b5`>Rs  
 { osn ,kD*  
  if(pMsg -> wParam == VK_ESCAPE) +2+|zXmT  
   return TRUE; oT0:Ny  
  if(pMsg -> wParam == VK_RETURN) [gGo^^aW#  
   return TRUE; L"RE[" m  
 } O{x-9p  
 return CDialog::PreTranslateMessage(pMsg); ^+w1:C5  
} W[f%m0  
)>tT ""yEl  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %/2OP &1<  
{ l?A~^4(5a/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ []doLt;J  
  SaveBmp(); <UY9<o  
  return FALSE; &PPYxg<  
} 40aD\S>  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ (y s<{Y-;  
 CMenu pop; &z05h<]  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); N :OLN[  
 CMenu*pMenu=pop.GetSubMenu(0);  Q!5W x  
 pMenu->SetDefaultItem(ID_EXITICON); uuQsK. S  
 CPoint pt; _ h/:r1  
 GetCursorPos(&pt); xb2j |KY7  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 87F]a3  
 if(id==ID_EXITICON) e=+q*]>  
  DeleteIcon(); :w]NN\  
 else if(id==ID_EXIT) v}\Fbe  
  OnCancel(); d ATAH}r&  
 return FALSE; [HhaBy9  
} u"MfxW`  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); #y'p4Xf  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 7^;-[? l  
 AddIcon(); $9h^tP'CV  
 return res; >y+?Sz!  
} @O/"s~d-  
Wcbm,O4u  
void CCaptureDlg::AddIcon() drvz [ 9;  
{ HQSFl=Q  
 NOTIFYICONDATA data; \*M;W|8aB  
 data.cbSize=sizeof(NOTIFYICONDATA); O>>/2V9  
 CString tip; !D!"ftOm  
 tip.LoadString(IDS_ICONTIP); mA#;6?6  
 data.hIcon=GetIcon(0); F-XMy>9  
 data.hWnd=GetSafeHwnd(); *^KEb")$  
 strcpy(data.szTip,tip); <sn,X0W  
 data.uCallbackMessage=IDM_SHELL;  PZY6 I  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; X/bu z  
 data.uID=98; 2UopGxrPKw  
 Shell_NotifyIcon(NIM_ADD,&data); =3nA5'UZ  
 ShowWindow(SW_HIDE); cfPp>EK  
 bTray=TRUE; k(xB%>ns  
} %XQJ!sC`  
ZFtJoGaR  
void CCaptureDlg::DeleteIcon() >U.7>K V&  
{ {N << JX  
 NOTIFYICONDATA data; ^9]g5.z:  
 data.cbSize=sizeof(NOTIFYICONDATA); H6Ytp^~>  
 data.hWnd=GetSafeHwnd(); _88X-~.  
 data.uID=98; zDBm^ s  
 Shell_NotifyIcon(NIM_DELETE,&data); nchpD@'t  
 ShowWindow(SW_SHOW); MwX8FYF D  
 SetForegroundWindow(); 1+ [,eq  
 ShowWindow(SW_SHOWNORMAL); `QZKW  
 bTray=FALSE; \p%D;g+c  
} )=cJW(nfP  
o=-Af|#b  
void CCaptureDlg::OnChange() S_ra8HY8  
{ 5~$WSL?O)  
 RegisterHotkey(); HIUP =/x  
} zCv)%y  
(1[Z#y[  
BOOL CCaptureDlg::RegisterHotkey() lR/Uboyy  
{ XtE O)  
 UpdateData(); {b-SK5%]L  
 UCHAR mask=0; nkz<t   
 UCHAR key=0; aU/y>Y <k  
 if(m_bControl) B 74  
  mask|=4; MShcZtN  
 if(m_bAlt) !=HxL-`j  
  mask|=2; 3BAQ2S}  
 if(m_bShift) 7%&e4'SZO  
  mask|=1; Od~ e*gA8  
  key=Key_Table[m_Key.GetCurSel()]; 5=fS^]- F  
 if(bRegistered){ )(rr1^Xer  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ^Nt^.xi7  
  bRegistered=FALSE; w4R~0jXy  
 } ti3S'K0t  
 cMask=mask; }S4+1 U3  
 cKey=key; %L$ ?Mey  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); s@g _F  
 return bRegistered; p}JGx^X ~  
} o?+?@Xb'  
DH bS=Iih  
  四、小结 n<F3&2w  
It VVI"-  
  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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