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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: z@VL?A(3  
  "a2|WKpD  
  一、实现方法 ^5s7mls  
`n>|rd  
  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: \'Ca1[y@B  
HK :K~h  
#pragma data_seg("shareddata") lPR^~&/  
HHOOK hHook =NULL; //钩子句柄 KS8@A/f  
UINT nHookCount =0; //挂接的程序数目 SY5}Bu#  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 (xW+* %  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 pG"wQ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey nT> v  
static int KeyCount =0; ke2dQ^kc4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 l8?C[, K%  
#pragma data_seg() :jv(-RTI  
L'Cd` .yVO  
  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。 A4,%l\di<  
BlpyE[h T  
  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: r5xm7- `c  
X`_tm3HC  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 9@CRL=  
cKey,UCHAR cMask) 8|@) #:  
{ jv.tg,c_6  
 BOOL bAdded=FALSE; /x@aAJ|  
 for(int index=0;index<MAX_KEY;index++){ [[c0g6  
  if(hCallWnd[index]==0){ J.JD8o9sa  
   hCallWnd[index]=hWnd; 'a0M.*f}G  
   HotKey[index]=cKey; K W&muD  
   HotKeyMask[index]=cMask; HsTY*^V  
   bAdded=TRUE; q>(?Z#sB  
   KeyCount++; lt-3OcC  
   break; )&T 5 /+  
  } FDgo6x   
 } t#(=$  
 return bAdded; m Z +dr[  
} EHq; eF  
//删除热键 e'uC:O.u  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )w4U]inJ$"  
{ KH)-=IJ8  
 BOOL bRemoved=FALSE; ?ja%*0 R  
 for(int index=0;index<MAX_KEY;index++){ LT$t%V0?.e  
  if(hCallWnd[index]==hWnd){ E] g Lwg9K  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ BDf M4  
    hCallWnd[index]=NULL; F)~>4>hPr  
    HotKey[index]=0; "y~*1kBu  
    HotKeyMask[index]=0; q`mxN!1[  
    bRemoved=TRUE; 2'=)ese  
    KeyCount--; eV!(a8  
    break; cEa8l~GC<  
   } Fy\q>(v.  
  } n@tt.n!{l  
 } vWmp ?m  
 return bRemoved; tW~kn9glZ  
} +pgHCzwJE  
#C } +  
I )yaR+l  
  DLL中的钩子函数如下: "0%K3d+  
'AK '(cZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) W5'6L =WG  
{ Q4 &P\V  
 BOOL bProcessed=FALSE; aHC%:)ww:  
 if(HC_ACTION==nCode) /[lEZ['^  
 { %Qz<Lk">.  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ;76+J)  
   switch(wParam) yKUxjb^b\  
   {  4G:~|N.{p  
    case VK_MENU: <ot`0  
     MaskBits&=~ALTBIT; [*O>Lk  
     break; 5|0/$ SWd*  
    case VK_CONTROL: 6p }a!  
     MaskBits&=~CTRLBIT; +x{o  
     break; nGWy4rY2S  
    case VK_SHIFT: gdD|'h  
     MaskBits&=~SHIFTBIT; oUsfO-dET^  
     break; 7:F0?l*  
    default: //judge the key and send message EGI$=Y  
     break; _R(ZvsOZ  
   } [2xu`HT02  
   for(int index=0;index<MAX_KEY;index++){ Y[)mHs2  
    if(hCallWnd[index]==NULL) ;UXV!8SM  
     continue; h8O\sKn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u(3 uZ:  
    { {,uSDI Oj$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); wz3X;1l`c  
     bProcessed=TRUE; d)U(XiK'  
    } |WS@q'  
   } xGr{ad.N  
  } m{ani/bt  
  else if((lParam&0xc000ffff)==1){ //有键按下 @ NDcO,]  
   switch(wParam) qbSI98r w  
   { ]:@{tX 7c  
    case VK_MENU: p=UW ^95  
     MaskBits|=ALTBIT; b=S"o )>  
     break; clyp0`,7  
    case VK_CONTROL: !BW!!/U  
     MaskBits|=CTRLBIT; msCz\8Xd  
     break; k@%5P-e}  
    case VK_SHIFT: }~&0<8m  
     MaskBits|=SHIFTBIT; d , g~.iS~  
     break; 3/usgw1  
    default: //judge the key and send message ,F->*=  
     break; bxPa|s?  
   } z-K};l9y  
   for(int index=0;index<MAX_KEY;index++){ PW%ith1)<  
    if(hCallWnd[index]==NULL) Ff>X='{  
     continue; m4W (h6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L'$\[~Ug  
    { ; Yc\O:Qq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); X} V]3  
     bProcessed=TRUE; U) xeta+  
    } h`! 4`eI  
   } w(_:+-rqQ<  
  } U~sC%Ri-@U  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 x&u@!# d]  
   for(int index=0;index<MAX_KEY;index++){ rZ.=Lq  
    if(hCallWnd[index]==NULL) E$8-8[  
     continue; `}P9[HP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 27[e0 j  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); d< XY"Y%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 .$d:c61X  
   } +KExK2=  
  } ":T"Y;  
 } MY\mo,#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); aBQ--Sz  
} G+sB/l"  
~7j-OWz9  
  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: o6 NmDv5  
N1g;e?T ':  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); k}kwr[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); wp8-(E^  
VIGLl'8p  
  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: =&-.]| t  
aH%tD!%,o  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Dz.kJ_"Ro  
{ NI:OL  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) uCW}q.@4  
 { D5@}L$ u  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Q$'\_zV  
  SaveBmp(); ?vD<_5K; I  
  return FALSE; d_:tiHw$  
 } *S <I!7Q  
 …… //其它处理及默认处理 >~_>.R+{  
} /;Cx|\  
V^D 1:9i  
xPT$d,~"  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 cbou1Ei   
uVZm9Sp  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 "/^kFsvp  
s#0m  
  二、编程步骤 T|oDJ]\J  
/YwwG;1  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Z^mIGy}  
%^I 7=  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ,-$%>Uv   
P:'y}a-  
  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; <;b  
kz#x6NXj  
  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; -jTK3&5  
_fj@40i M  
  5、 添加代码,编译运行程序。 Um/ g&k  
 q _;#EV  
三、程序代码 8BS$6Pa  
:/Y4I)'  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL `i!-@WN"  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Q3)[ *61e  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ E9 #o0Di  
#if _MSC_VER > 1000 I[ZWOi\- ;  
#pragma once uWXxK"J.  
#endif // _MSC_VER > 1000 $:D L+E-}  
#ifndef __AFXWIN_H__ aQ 6T2bQ  
#error include 'stdafx.h' before including this file for PCH hA~5,K0b  
#endif aC'#H8e|j  
#include "resource.h" // main symbols W89J]#v)k  
class CHookApp : public CWinApp .d)H2X  
{ |@>Zc5MY$  
 public: MhFj>t   
  CHookApp(); qP%[ nY  
  // Overrides $U_1e'  
  // ClassWizard generated virtual function overrides H:1F=$0I9  
  //{{AFX_VIRTUAL(CHookApp) 7BA9zs392  
 public: h7]>b'H  
  virtual BOOL InitInstance(); ).C>>1ZC  
  virtual int ExitInstance(); k|_ >I  
  //}}AFX_VIRTUAL  mxvV~X %  
  //{{AFX_MSG(CHookApp) OHF:E44k  
  // NOTE - the ClassWizard will add and remove member functions here. 79lG~BGE  
  // DO NOT EDIT what you see in these blocks of generated code ! Me,AE^pgL'  
  //}}AFX_MSG /8(t:  
  DECLARE_MESSAGE_MAP() IP 1{gMG  
}; 9JC8OSjJ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); !.{{QwZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }<P%W~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6ozBU^n  
BOOL InitHotkey(); w$I$xup  
BOOL UnInit(); ? v@q&  
#endif );F /P0P  
\l;H !y[  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. D>q?My  
#include "stdafx.h" [;INVUwG^  
#include "hook.h" MES|iB  
#include <windowsx.h> I1Gk^wO  
#ifdef _DEBUG 0jefV*3qpB  
#define new DEBUG_NEW b WZ X  
#undef THIS_FILE vC5 (  
static char THIS_FILE[] = __FILE__; e-{4qt  
#endif Q# $dp  
#define MAX_KEY 100 T^ah'WmNw  
#define CTRLBIT 0x04 ZZ;V5o6E  
#define ALTBIT 0x02 $0E_4#kwB  
#define SHIFTBIT 0x01 1T7;=<g`  
#pragma data_seg("shareddata") }JWk?  
HHOOK hHook =NULL; &]'< M  
UINT nHookCount =0; P\|i<Ds_M  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey w`0r`\#V/  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 3D7phq>.q  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey F a'2i<  
static int KeyCount =0; Uw_z9ZL  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift /`VtW$9-  
#pragma data_seg() .mS'c#~5Y  
HINSTANCE hins; @)wNINvD  
void VerifyWindow(); Ne,u\q3f  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) =gr3a,2  
//{{AFX_MSG_MAP(CHookApp) {~d8_%:b  
// NOTE - the ClassWizard will add and remove mapping macros here. }NJ? .Y  
// DO NOT EDIT what you see in these blocks of generated code! Vt," 5c  
//}}AFX_MSG_MAP I:#Es.  
END_MESSAGE_MAP() nR~L$Wu5_a  
(hX}O>  
CHookApp::CHookApp() _\xd]~ELj  
{ xSHeP`P^X  
 // TODO: add construction code here, [R[Suf  
 // Place all significant initialization in InitInstance F{aM6I  
} vV9q5Bj:  
AfW9;{j&I  
CHookApp theApp; ?_c*(2i&^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) bQM_rqjJGw  
{ | [lM2  
 BOOL bProcessed=FALSE; 3~!PJI1  
 if(HC_ACTION==nCode) R'r^v  
 { \=/^H  
  if((lParam&0xc0000000)==0xc0000000){// Key up Me*]Bh  
   switch(wParam) @oL<Ioh  
   { vl}uHdeP9  
    case VK_MENU: pn~$u  
     MaskBits&=~ALTBIT; Y|iALrx  
     break; PUViTb  
    case VK_CONTROL: ^Ru/7pw 5  
     MaskBits&=~CTRLBIT; OW<5,h  
     break; sj@'C@oK  
    case VK_SHIFT: :3Z"Qk$uR  
     MaskBits&=~SHIFTBIT; /\9X0a2h|E  
     break; l;g8_uyjv7  
    default: //judge the key and send message .<`Rq'  
     break; :xT=uE.I  
   } Ls^$E  
   for(int index=0;index<MAX_KEY;index++){ 9m fYB  
    if(hCallWnd[index]==NULL) e$^O_e  
     continue; 7L:$Amb_F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;-d :!*  
    { M -df Gk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6!n%SUt  
     bProcessed=TRUE; b1;80P/:D  
    } )xQA+$H#4  
   } [ Q6v#I  
  } (HkMubnqg  
  else if((lParam&0xc000ffff)==1){ //Key down [Hww3+~+  
   switch(wParam) 7Jm9,4]  
   { 8W"~>7/>D  
    case VK_MENU: eS jXaZh  
     MaskBits|=ALTBIT; 5sq#bvfJ o  
     break; f13%[RA9N  
    case VK_CONTROL: d(L u|/~  
     MaskBits|=CTRLBIT; * 5#Y [c  
     break; ZIx,?E+eJ  
    case VK_SHIFT: l~M86 h  
     MaskBits|=SHIFTBIT; vxo iPqo  
     break; /*lSpsBn  
    default: //judge the key and send message &6E^<v?]  
     break; Gu:aSb  
   } "rr,P0lgX  
   for(int index=0;index<MAX_KEY;index++) |!)3[<.  
   { g9;}?h  
    if(hCallWnd[index]==NULL) NTVdSK7z~H  
     continue; *r+i=i8{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zKWcDbj  
    { fD<3Tl8U0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); }IGr%C(3%  
     bProcessed=TRUE; kN>AY'1  
    } G?MNM-2  
   } 7b,u|F  
  } HzT"{N9  
  if(!bProcessed){ !58-3F%P  
   for(int index=0;index<MAX_KEY;index++){ w7"Z @$fs  
    if(hCallWnd[index]==NULL) *~|xj,md  
     continue; QP?Z+P<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Dg@>d0FW  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 3D k W  
   } Px}#{fkS  
  } C``%<)WC  
 } #kV`G.EX  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); W&6P%0G/  
} -~ `5kO~  
2Fce| Tn  
BOOL InitHotkey() GjA;o3(  
{ @M"h_Z1#  
 if(hHook!=NULL){ pVw)"\S%  
  nHookCount++; c|Nv^V*2  
  return TRUE; d3(T=9;f2  
 } x 1$tS#lS  
 else mD)_quz.sk  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); oZ@_o3VG  
  if(hHook!=NULL) Ajhrsa\~a  
   nHookCount++; gBq,So  
  return (hHook!=NULL); 8lt P)K4  
} gRKmfJ*u  
BOOL UnInit() +MeEy{;  
{ pscCXk(|A`  
 if(nHookCount>1){ 5HioxHL  
  nHookCount--; Xt/muV  
  return TRUE; <vA^%D<\~  
 } PZR pH  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 5Y)!q?#H  
 if(unhooked==TRUE){ VWmZ|9Ri  
  nHookCount=0; o;\0xuM@  
  hHook=NULL; 2HMlh.R(C  
 } ?PSm) ~ Oa  
 return unhooked; rBkf@  
} Vl?R?K=`~J  
OlFls 8#>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) q'M-a tE.  
{ oHbEHS61  
 BOOL bAdded=FALSE; ' d1E~A  
 for(int index=0;index<MAX_KEY;index++){ #Qy*zU#9  
  if(hCallWnd[index]==0){ Sz"J-3b^  
   hCallWnd[index]=hWnd; gNzQ"W=  
   HotKey[index]=cKey; nKh._bvfX  
   HotKeyMask[index]=cMask; kkFE9:[-c&  
   bAdded=TRUE; M>0=A  
   KeyCount++; ][6$$ Lz  
   break; >NW /0'/  
  } /U6G?3b  
 } 5 8p_b  
 return bAdded; _pKW($\  
} -";'l @D=  
VA)3=82n  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) M:nXn7)+  
{ o 1#XM/Z  
 BOOL bRemoved=FALSE; sN 7I~  
 for(int index=0;index<MAX_KEY;index++){ _4rb7"b1  
  if(hCallWnd[index]==hWnd){ L;5j hVy  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ co<){5zOT  
    hCallWnd[index]=NULL; 7vcYI#(2 Y  
    HotKey[index]=0; JHc|.2Oe  
    HotKeyMask[index]=0; @k,u xe-  
    bRemoved=TRUE; )-[ 2vhXz  
    KeyCount--; ]ODC+q1  
    break; _d]w)YMO  
   } Lz=nJn  
  } !Il>,q&F  
 } C_PXh>H]'  
 return bRemoved; $ah, $B  
} 7|T5N[3?l,  
@C7S^|eo  
void VerifyWindow() m^O:k"+!  
{ McxJ C<  
 for(int i=0;i<MAX_KEY;i++){ hn.9j"  
  if(hCallWnd!=NULL){ AzN.vA)q  
   if(!IsWindow(hCallWnd)){ \%E Zg  
    hCallWnd=NULL; :4<+)r26  
    HotKey=0; s>"=6gb  
    HotKeyMask=0; 2sy{  
    KeyCount--; vP3Fb;  
   } <=cj)  
  } Cr4shdN34  
 } {mw,U[C  
} H[<"DP  
L1Fn;nR  
BOOL CHookApp::InitInstance() q!""pr<n  
{ ^Cyx "s't  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); x7l)i!/$  
 hins=AfxGetInstanceHandle(); 2#*Bw=  
 InitHotkey(); g84~d(\?  
 return CWinApp::InitInstance(); M[R, m_p  
} S]9:3~  
CTR|b}!  
int CHookApp::ExitInstance() Zx55mSfx:  
{ 8S@ ~^D  
 VerifyWindow(); @+ Berb  
 UnInit(); EFf<| v  
 return CWinApp::ExitInstance(); mh.0% 9`9  
} T6Ue\Sp'  
_xAdvr' W  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file @p|[7'  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) KHcf P7  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^P:9iu)+]~  
#if _MSC_VER > 1000 `\q4z-<-  
#pragma once j"_V+)SD  
#endif // _MSC_VER > 1000 Rr4r[g#  
vV#Jl) A  
class CCaptureDlg : public CDialog +tdt>)a  
{ (~}yt.7K  
 // Construction 20 zIO.&o  
 public: B HoZ}1_  
  BOOL bTray; %9-).k  
  BOOL bRegistered; =NF},j"  
  BOOL RegisterHotkey(); >efYpd#^  
  UCHAR cKey; //Hn[wEOh  
  UCHAR cMask; -YA1Uk  
  void DeleteIcon(); Kdx?s;i  
  void AddIcon(); ,, ]y 8P  
  UINT nCount; tV*g1)'zX  
  void SaveBmp(); i layU  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor _9#4  
  // Dialog Data E} Uy-  
  //{{AFX_DATA(CCaptureDlg) u+[ZWhKUp  
  enum { IDD = IDD_CAPTURE_DIALOG }; isDBNXV:  
  CComboBox m_Key; 8\. #  
  BOOL m_bControl; 0D|^S<z6  
  BOOL m_bAlt; n9t8RcJS:  
  BOOL m_bShift; 4zpprh+`K  
  CString m_Path; /r[0Dw  
  CString m_Number; ub+>i  
  //}}AFX_DATA 0RYh4'=F  
  // ClassWizard generated virtual function overrides SG8|xoL  
  //{{AFX_VIRTUAL(CCaptureDlg) 3,oFT   
 public: }n:'@}  
  virtual BOOL PreTranslateMessage(MSG* pMsg); b,KQG|k  
 protected: c pgHF`nt  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support hP`3Ao  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !(uyqplTk  
  //}}AFX_VIRTUAL )3'/g`c  
  // Implementation 8$OE<c?#5n  
 protected: 22}J.'Zb  
  HICON m_hIcon; .9lx@6]+  
  // Generated message map functions ]#j]yGV  
  //{{AFX_MSG(CCaptureDlg) Rw^4S@~T  
  virtual BOOL OnInitDialog(); V_Wv(G0-\  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); `-]*Qb+  
  afx_msg void OnPaint(); f@[q# }6  
  afx_msg HCURSOR OnQueryDragIcon(); ]*%0CDY6`N  
  virtual void OnCancel(); wcsUb 9(  
  afx_msg void OnAbout(); 'Xxt[Jy  
  afx_msg void OnBrowse(); ,hT t]w  
  afx_msg void OnChange(); 3PpycJ}  
 //}}AFX_MSG -zN*2T  
 DECLARE_MESSAGE_MAP() QI=",vma u  
}; SD8Q_[rY  
#endif _9Iz'-LgB  
BNQ~O^R0  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file &=<x&4H+  
#include "stdafx.h" (gvaYKvr  
#include "Capture.h" IObGmc  
#include "CaptureDlg.h" QC \8Zy  
#include <windowsx.h> dL |D  
#pragma comment(lib,"hook.lib") 1 c3gHc7{t  
#ifdef _DEBUG K>lA6i7?  
#define new DEBUG_NEW 9{'GrL  
#undef THIS_FILE Jq<&`6hn  
static char THIS_FILE[] = __FILE__; Ad9'q!_en  
#endif F.c,FR2  
#define IDM_SHELL WM_USER+1 #J)sz,)(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \a<qI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \gDf&I  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; jC@$D*"J  
class CAboutDlg : public CDialog v'`C16&^]  
{ deQ0)A 4g  
 public: !-U5d9!  
  CAboutDlg(); DNLqipUw  
  // Dialog Data 2%. A{!  
  //{{AFX_DATA(CAboutDlg) pu0IhDMn  
  enum { IDD = IDD_ABOUTBOX }; 3-lJ]7OT  
  //}}AFX_DATA }_@*,  
  // ClassWizard generated virtual function overrides 9=ns.r  
  //{{AFX_VIRTUAL(CAboutDlg) U;`N:~|p#  
 protected: ?`u Y*+u  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Eu l,1yR  
  //}}AFX_VIRTUAL (6^v`SZ  
  // Implementation Al5E  
 protected: *6df|q  
  //{{AFX_MSG(CAboutDlg) yS@c2I602  
  //}}AFX_MSG q$(aMO&J  
  DECLARE_MESSAGE_MAP() k9~NIvnB`  
}; [ZZ~^U5  
(5cc{zKtR  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) l"f.eo0@7  
{ d2Z5HFtY  
 //{{AFX_DATA_INIT(CAboutDlg) Y]Vt&*{JV  
 //}}AFX_DATA_INIT u+&BR1)C  
} vCb3Ra~L`  
)%-FnW  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ]p\7s  
{ )U`6` &F  
 CDialog::DoDataExchange(pDX); \5_+6  
 //{{AFX_DATA_MAP(CAboutDlg) &;&i#ZO  
 //}}AFX_DATA_MAP (]w_}E]N  
} Dwj!B;AZ_  
"|{ NRIE  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Qo4]_,kR  
 //{{AFX_MSG_MAP(CAboutDlg) po4seW!  
 // No message handlers Yev] Lp  
 //}}AFX_MSG_MAP ~4"adOv  
END_MESSAGE_MAP() FDbb/6ku  
|cEJRs@B  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) AA6_D?)vv  
: CDialog(CCaptureDlg::IDD, pParent) Y}&//S A  
{ aqQ YU5l4~  
 //{{AFX_DATA_INIT(CCaptureDlg) ZNuz%VO  
  m_bControl = FALSE; 9y{[@KG  
  m_bAlt = FALSE; =3]}87  
  m_bShift = FALSE; F=7X,hK  
  m_Path = _T("c:\\"); 6NPCp/  
  m_Number = _T("0 picture captured."); MCZTeYnx  
  nCount=0; !g  #  
  bRegistered=FALSE; jV2L;APCq  
  bTray=FALSE; 6}6;%{p"Gu  
 //}}AFX_DATA_INIT Oh3AbpTT  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 @%d g0F}h  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ?3D|{  
} N7Kq$G2O  
]P;uQ!  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) wN>k&J  
{ k |k  
 CDialog::DoDataExchange(pDX); [CL.Xil=  
 //{{AFX_DATA_MAP(CCaptureDlg) Hbu8gqu  
  DDX_Control(pDX, IDC_KEY, m_Key); m2F2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 2&MIt(\-  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Y,w'Op  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Jr$,w7tQn@  
  DDX_Text(pDX, IDC_PATH, m_Path); PIR#M('  
  DDX_Text(pDX, IDC_NUMBER, m_Number); VG0Ty;bV  
 //}}AFX_DATA_MAP O-J;iX}  
} b`){f\#t  
K1>X%f^  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 5\gL+ qM0  
//{{AFX_MSG_MAP(CCaptureDlg) GqMa|8j  
 ON_WM_SYSCOMMAND() c7UmR?m  
 ON_WM_PAINT() V T8PV5z  
 ON_WM_QUERYDRAGICON() jd8`D6|Z  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) f4UnLig  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 7|%|w  
 ON_BN_CLICKED(ID_CHANGE, OnChange) " !F)K  
//}}AFX_MSG_MAP 7#d>a=$h  
END_MESSAGE_MAP() nr7#}pzo  
Yv<' QC  
BOOL CCaptureDlg::OnInitDialog() +Z> Y//  
{ =r"-Pm{  
 CDialog::OnInitDialog(); &|yQwNA*a"  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); *j5>2-C &  
 ASSERT(IDM_ABOUTBOX < 0xF000); %:2EoXN"  
 CMenu* pSysMenu = GetSystemMenu(FALSE);  ?QxI2J  
 if (pSysMenu != NULL) _&V%idz!0  
 { &.XlXihnt  
  CString strAboutMenu; yHhx- `  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Le;;Yd}f  
  if (!strAboutMenu.IsEmpty()) x93h{K f  
  { H'KCIqo  
   pSysMenu->AppendMenu(MF_SEPARATOR); P 4Vi~zMX  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); <7'`N\a  
  } a%| I'r  
 } FvYgpbEZ  
 SetIcon(m_hIcon, TRUE); // Set big icon |osu4=s|  
 SetIcon(m_hIcon, FALSE); // Set small icon 1 aWzd[i  
 m_Key.SetCurSel(0); $J6Pv   
 RegisterHotkey(); t/55tL  
 CMenu* pMenu=GetSystemMenu(FALSE); !%MI9Ok  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); V`P8oIOh]  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ]Z\Z_t  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); H#H@AY3Y  
 return TRUE; // return TRUE unless you set the focus to a control z=mH\!  
} ?*DM|hzOi  
(-S<9u-r  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) mm}y/dO~}  
{ Y-2IAJHS8  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 0lpkG ="&r  
 { 7egE."  
  CAboutDlg dlgAbout; aa|u *afWQ  
  dlgAbout.DoModal(); UWU(6J|Fk  
 } q4u,pm,@  
 else w O H{L  
 { 0s9-`nHen|  
  CDialog::OnSysCommand(nID, lParam); y7CC5S ?  
 } 5k:SD7^b  
} S]!s)q-- z  
(=A61]yB  
void CCaptureDlg::OnPaint() grD[7;1~:)  
{ TF]bmM})0  
 if (IsIconic()) *JnY0xP  
 { J?6.yL;  
  CPaintDC dc(this); // device context for painting F/pq9  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /ILj}g'  
  // Center icon in client rectangle OlU')0Y  
  int cxIcon = GetSystemMetrics(SM_CXICON); ->Z9j(JU  
  int cyIcon = GetSystemMetrics(SM_CYICON); nm"]q`(K  
  CRect rect; uu7 ?,WT  
  GetClientRect(&rect); ),{v  
  int x = (rect.Width() - cxIcon + 1) / 2; r ^=rs!f@  
  int y = (rect.Height() - cyIcon + 1) / 2; Ibf~gr(j  
  // Draw the icon 1O#]qZS}]  
  dc.DrawIcon(x, y, m_hIcon); 7gWT[  
 } j1zrjhXI  
 else jY;T:C-T  
 { 1G}f83yR  
  CDialog::OnPaint(); Borr  
 } vHJOpQmt~  
} F u>  
vYFtw L`  
HCURSOR CCaptureDlg::OnQueryDragIcon() @%lkRU)  
{ $>JfLSyC  
 return (HCURSOR) m_hIcon; 5)5$h]Nz>  
} uzoI*aqk-s  
Pj-.oS2dA  
void CCaptureDlg::OnCancel() *wk?{ U  
{ D\:dn  
 if(bTray) ^VC /tJ  
  DeleteIcon(); # &,W x  
  CDialog::OnCancel(); 1NAGGr00  
} 7xF)\um  
18^#:=Z  
void CCaptureDlg::OnAbout() l4s*+H$vd?  
{ jKh:}yl4  
 CAboutDlg dlg; }_/]f!]  
 dlg.DoModal(); ,`Keqfx  
} e{EC# %x_  
kzE<Y  
void CCaptureDlg::OnBrowse() V` T l$EF  
{ LC1WVK/  
 CString str; zqHG2:MN"  
 BROWSEINFO bi; 0g 2?  
 char name[MAX_PATH]; Iuyq!R4:7  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); zRU9Q 2Y  
 bi.hwndOwner=GetSafeHwnd(); d*YVk{s7V  
 bi.pszDisplayName=name; {+~ JTrp  
 bi.lpszTitle="Select folder";  -uKTEG[  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Ypx5:gm|J  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0OXl`V`w  
 if(idl==NULL) A"e4w?  
  return; +>&i]x(b  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); oF0DprP@  
 str.ReleaseBuffer(); hW!2C6  
 m_Path=str; z''ejq  
 if(str.GetAt(str.GetLength()-1)!='\\') 85x34nT  
  m_Path+="\\"; C66 9:%  
 UpdateData(FALSE); HNRAtRvnY  
} |.4>#<$__  
 Vp7d  
void CCaptureDlg::SaveBmp() MY60%  
{ eRqPZb"6MR  
 CDC dc; J$W4AT  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); s=e`}4  
 CBitmap bm; sYq:2Wn>8Q  
 int Width=GetSystemMetrics(SM_CXSCREEN); cP",szcY  
 int Height=GetSystemMetrics(SM_CYSCREEN); ;^TSla+t+  
 bm.CreateCompatibleBitmap(&dc,Width,Height); {wDq*va  
 CDC tdc; ^e]O-,UBk  
 tdc.CreateCompatibleDC(&dc); /1v:eoF;  
 CBitmap*pOld=tdc.SelectObject(&bm); Pn,>eD*g  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); {Rdh4ZKh  
 tdc.SelectObject(pOld); =@nE:uto]  
 BITMAP btm; 5DpvMhc_  
 bm.GetBitmap(&btm); !kG|BJ$j  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 3(Ns1/;?,  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); zcC:b4  
 BITMAPINFOHEADER bih;  Y(  
 bih.biBitCount=btm.bmBitsPixel; =H`yzGt  
 bih.biClrImportant=0; _dY5qW1p  
 bih.biClrUsed=0; e-Oz`qW~  
 bih.biCompression=0; sf0\#Q  
 bih.biHeight=btm.bmHeight; AdpJ4}|0  
 bih.biPlanes=1; gg/ts]$  
 bih.biSize=sizeof(BITMAPINFOHEADER); <PFF\NE9  
 bih.biSizeImage=size; N%,zME  
 bih.biWidth=btm.bmWidth; ~ _hA{$  
 bih.biXPelsPerMeter=0; 8(Q|[  
 bih.biYPelsPerMeter=0; [_KV;qS%/  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Gshy$'_e  
 static int filecount=0; EJP]E)  
 CString name; '6kD6o_p1  
 name.Format("pict%04d.bmp",filecount++); Rt5,/Q0  
 name=m_Path+name; i)]f0F  
 BITMAPFILEHEADER bfh; P(s:+  
 bfh.bfReserved1=bfh.bfReserved2=0; [dR#!"6t  
 bfh.bfType=((WORD)('M'<< 8)|'B'); id588Y78  
 bfh.bfSize=54+size; UGlHe7  
 bfh.bfOffBits=54; 2z.~K&+x  
 CFile bf; )QW hzY  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ (Hmm^MV)  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [7Q%c!e$*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); :L{*B$c  
  bf.WriteHuge(lpData,size); b9ud8wLE[  
  bf.Close(); qw*) R#=  
  nCount++; ?yxQs=&-q~  
 } NiFe#SLA  
 GlobalFreePtr(lpData); aZ|?i }  
 if(nCount==1) s3T7M:DM4  
  m_Number.Format("%d picture captured.",nCount); k+%&dEE|vH  
 else ?(U a+*b  
  m_Number.Format("%d pictures captured.",nCount); Y]_$+Si:NK  
  UpdateData(FALSE); l[]cUE  
} %-]a[qf3  
+?W4ac1  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) +0 }_X  
{ 2~ 4&4  
 if(pMsg -> message == WM_KEYDOWN) ::+;PRy_E  
 { '=O1n H<  
  if(pMsg -> wParam == VK_ESCAPE) FW5v 1s=  
   return TRUE; D^2lb"3  
  if(pMsg -> wParam == VK_RETURN) @}19:A<'  
   return TRUE; \>>P%EU,  
 } -$kIVh  
 return CDialog::PreTranslateMessage(pMsg); b\KbF/ T  
} FrUqfTi+W  
Q% d1O  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m[(_fOd  
{ 6:L2oW 6}{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ :<s`)  
  SaveBmp(); ZW9OPwV  
  return FALSE; K@JaN/OM  
} ]v0Z[l>yf  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ _g fmo  
 CMenu pop; [Y$ TVwFwX  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); S*>T%#F6Uo  
 CMenu*pMenu=pop.GetSubMenu(0); NM^uP+uS  
 pMenu->SetDefaultItem(ID_EXITICON); wx[m-\  
 CPoint pt; ~#4FL<W  
 GetCursorPos(&pt); 8MI8~  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Mo<q(_ZeRP  
 if(id==ID_EXITICON) c_CVZR?  
  DeleteIcon(); g~b$WV%  
 else if(id==ID_EXIT) @ZjO#%Ep/  
  OnCancel(); Z:<an+v|5  
 return FALSE; -)B_o#2=2  
} $qr6LIKGw  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); \@yJbhk  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) >MKj~Ud  
 AddIcon(); #Q)r6V:  
 return res; w~'}uh  
} :s&dn%5N"  
<YtjE!2  
void CCaptureDlg::AddIcon() W8$0y2  
{ cC>Svf[CzK  
 NOTIFYICONDATA data; j}B86oX  
 data.cbSize=sizeof(NOTIFYICONDATA); 7i{(,:  
 CString tip; *Ow2,{Nn  
 tip.LoadString(IDS_ICONTIP); '<YBoU{ e*  
 data.hIcon=GetIcon(0); 79c M _O  
 data.hWnd=GetSafeHwnd(); Ncsh{.  
 strcpy(data.szTip,tip); ;9WUt,R  
 data.uCallbackMessage=IDM_SHELL; "oNl!<ep  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; xpO;V}M|  
 data.uID=98; ;@Fb>l BhX  
 Shell_NotifyIcon(NIM_ADD,&data); 4p-"1 c$  
 ShowWindow(SW_HIDE); /gl8w-6  
 bTray=TRUE; uDXV@;6<  
} Z]R#F0"U  
qB,0(I1-!  
void CCaptureDlg::DeleteIcon() zRD-[Z/-  
{ >$9}"  
 NOTIFYICONDATA data; b}ya9tCl;  
 data.cbSize=sizeof(NOTIFYICONDATA); ,OubKcNg  
 data.hWnd=GetSafeHwnd(); <qpzs@  
 data.uID=98; Osm))Ua(  
 Shell_NotifyIcon(NIM_DELETE,&data); _<{<b  
 ShowWindow(SW_SHOW); &^DVSVqs^  
 SetForegroundWindow(); PZJ9f8 V  
 ShowWindow(SW_SHOWNORMAL); IQ_s]b;z  
 bTray=FALSE; c AO:fb7  
} $-Ex g*i  
}zf!mlk  
void CCaptureDlg::OnChange() {QylNC9  
{ mB"I(>q*M  
 RegisterHotkey(); {ri={p]l  
} jLt3jN  
LtX53c  
BOOL CCaptureDlg::RegisterHotkey() 5\XD/Q M  
{  >(ip-R  
 UpdateData(); ^d{5GK'  
 UCHAR mask=0; -,b+tC<V)0  
 UCHAR key=0; =#[oi3k  
 if(m_bControl) ;m#4Q6k)V?  
  mask|=4; CX{6  
 if(m_bAlt) 9$z$yGjl  
  mask|=2; Vc;[0iB  
 if(m_bShift) Tn1V+)  
  mask|=1; }.E^_`  
  key=Key_Table[m_Key.GetCurSel()]; ,0,FzxX0!  
 if(bRegistered){ dH;2OWM  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); -5 PVWL\  
  bRegistered=FALSE; w6cl3J&  
 } 1n!:L!,`  
 cMask=mask; +Tu?PuT7k  
 cKey=key; Jj+Q2D:  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -u'"l(n)~  
 return bRegistered; 2;WbXc!#!  
} 8$A0q%n  
ls:oC},p*  
  四、小结 ;J TY#)Bh  
>~rlnRX  
  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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