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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: k[;(@e@c  
  9y5nG  
  一、实现方法 ewzZb*\  
mi$*,fz  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ~JxAo\2i  
#kL4Rm;  
#pragma data_seg("shareddata") e=EM07z  
HHOOK hHook =NULL; //钩子句柄 L9(!L$  
UINT nHookCount =0; //挂接的程序数目 bY7~b/  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ^1w*$5YI  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @P}!mdH1  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey rJ_fg$.<  
static int KeyCount =0; '5m`[S-IU  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 'Lv>!s 7  
#pragma data_seg() / ,#&Htk  
:TN^}RML  
  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。 p+d?k"WN?  
;l2pdP4jf  
  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: pbb6?R,  
'Gds?o8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR \H$j["3  
cKey,UCHAR cMask) L# NW<T  
{ X |X~|&j  
 BOOL bAdded=FALSE; vd!|k5t[d  
 for(int index=0;index<MAX_KEY;index++){ $4*k=+wS  
  if(hCallWnd[index]==0){ z9[BQ(9t  
   hCallWnd[index]=hWnd; qECta'b&  
   HotKey[index]=cKey; z2.ZxL"*  
   HotKeyMask[index]=cMask; Na2n4x!  
   bAdded=TRUE; (.54`[2+L  
   KeyCount++; zWEt< `1M  
   break; c<j  +"  
  } \3v}:E+3  
 } !aub@wH3  
 return bAdded; qT+:oMrTSm  
} \Z%V)ZRi=  
//删除热键 %["V "{ z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "<I*ViZ  
{ ISl-W1u}  
 BOOL bRemoved=FALSE; 7BDoF!kCx  
 for(int index=0;index<MAX_KEY;index++){ */yR _f  
  if(hCallWnd[index]==hWnd){ 4w-P%-4  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {!rpE7P-  
    hCallWnd[index]=NULL; -R-|[xN  
    HotKey[index]=0; nPS:T|*G  
    HotKeyMask[index]=0; 6t(I.>-  
    bRemoved=TRUE; QUU'/e2^c  
    KeyCount--; &lYe  
    break; *wetPt)~v_  
   } j9Y'HU5"  
  } &DgJu.  
 } qC aM]Y  
 return bRemoved; SvD^'( x  
} t)/:VImY  
l&1R`gcW  
nofK(0TF  
  DLL中的钩子函数如下: 51lN,VVD  
z4 yV1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) c_YP#U  
{ j? P=}_Ru  
 BOOL bProcessed=FALSE; (77EZ07%  
 if(HC_ACTION==nCode) ($ l t@j  
 { 8~")9w  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 R7xEE7p  
   switch(wParam) J|A:C[7 2  
   {  4BgrG[l)  
    case VK_MENU: Y"&1jud4xl  
     MaskBits&=~ALTBIT; t*'U|K4L/  
     break; Ei[>%Ah  
    case VK_CONTROL: 8bIwRVA2\  
     MaskBits&=~CTRLBIT; +P. }<  
     break; ayvHS&h  
    case VK_SHIFT: 8 k%!1dyMB  
     MaskBits&=~SHIFTBIT; %+,7=Wt-  
     break; &=d0'3k>  
    default: //judge the key and send message 1SYBq,[])  
     break; 9 L^:N)-  
   }  + Y  
   for(int index=0;index<MAX_KEY;index++){ U F ]g6u  
    if(hCallWnd[index]==NULL) XV> )[Nd\H  
     continue; P,@ :?6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $rG~0  
    { GE{u2<%@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 56 raZC  
     bProcessed=TRUE; TQ\\/e:  
    } <CnTiS#  
   } ,B=;NKo  
  } sjISVJ?  
  else if((lParam&0xc000ffff)==1){ //有键按下 xEfz AJ5&  
   switch(wParam) w0FkKJV  
   { $J] b+Bp  
    case VK_MENU: X^;LiwQv  
     MaskBits|=ALTBIT; BCK0fk~  
     break; T+y3Ph--^  
    case VK_CONTROL: aA5rvP +  
     MaskBits|=CTRLBIT; 09psqXU@I  
     break; }L1 -2  
    case VK_SHIFT: \-?@ &' :  
     MaskBits|=SHIFTBIT; If*t$f>y4N  
     break; LgX"Qk&Ca  
    default: //judge the key and send message ^Q'^9M2)  
     break; A=5A8B1  
   } jK{)gO  
   for(int index=0;index<MAX_KEY;index++){ \:/ :S"-  
    if(hCallWnd[index]==NULL) 3Y}X7-|)Z  
     continue; aMaFxEW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) },G>+ s8h  
    { ;ESuj'*t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); C=z7Gk=  
     bProcessed=TRUE; X_0Ta_u?T  
    } [N-t6Z*  
   } +%hA 6n  
  } )K0BH q7r  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 (gn)<JJS}  
   for(int index=0;index<MAX_KEY;index++){ fq"<=  
    if(hCallWnd[index]==NULL) ?xbPdG":R  
     continue; i9FHEu_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) RI q9wD}4(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); xxlYn9ke  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ew|VDD(.  
   } _m+64qG_8'  
  } ]hxE^/87  
 } (KF=v31_m  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); P,ox) )+6  
} E9L)dMZSpj  
*Q@%< R  
  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: ^mu?V-4  
>lRa},5(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HJn  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Z,~EH  
,`3kDqS_4  
  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: n' \poB?  
g`}+K U  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $1h,<$5H  
{ Y!8Ik(/~i  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) -2dk8]KB]  
 { <3;Sq~^  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Fj`6v"h  
  SaveBmp(); u5, \Kz  
  return FALSE; w1je|Oil  
 } Zljj  
 …… //其它处理及默认处理 2^}E!(<  
} =vv4;az X  
xt%-<%s%f  
L;7x2&  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 T-: @p>  
@@,l0/  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 1HF=,K+  
g?'4G$M  
  二、编程步骤 $LLy#h?V]  
>^8=_i !  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 8}& O7zO?  
MMMuT^X  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; jORU+g  
Z>)(yi9+  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 5s >UM@})  
dJZMzn  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; J~6-}z   
>&|C E2'  
  5、 添加代码,编译运行程序。 [,Io!O  
MVGznf?  
三、程序代码 uIG,2u,  
rI\G&OqpP  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL wgK:^D P  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 6w d0"  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ h|_E>6d)  
#if _MSC_VER > 1000 Sc!{ o!9\  
#pragma once qjsS2,wM  
#endif // _MSC_VER > 1000 ;'.[h*u~<  
#ifndef __AFXWIN_H__ 0u]!C"VX  
#error include 'stdafx.h' before including this file for PCH j0p'_|)(  
#endif 6iiH+Nc  
#include "resource.h" // main symbols -/>SdR$D7  
class CHookApp : public CWinApp gg>O:np8  
{ DA5kox&cU  
 public: Z\{"/( Hi  
  CHookApp(); Ut;, Z  
  // Overrides ".9 b}}  
  // ClassWizard generated virtual function overrides nMK,g>wp  
  //{{AFX_VIRTUAL(CHookApp) ,qS-T'[v,(  
 public: Hoaf3 `n  
  virtual BOOL InitInstance(); ):@XMECa  
  virtual int ExitInstance(); o<*H!oyP\  
  //}}AFX_VIRTUAL m"{D}(TA  
  //{{AFX_MSG(CHookApp) CH6^;.  
  // NOTE - the ClassWizard will add and remove member functions here. fa7I6 i  
  // DO NOT EDIT what you see in these blocks of generated code ! Pd99vq/  
  //}}AFX_MSG w&eX)!  
  DECLARE_MESSAGE_MAP() vjy59m  
}; kxJ! #%w  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); d]JiJgfa%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %1uY  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hrpql_9.  
BOOL InitHotkey(); #S57SD  
BOOL UnInit(); =Fq"lq %  
#endif "t4$%7L]  
x \.q zi  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. vJheM*C  
#include "stdafx.h" |U*wMYC  
#include "hook.h" !2)$lM1@J  
#include <windowsx.h> SjT8 eH #  
#ifdef _DEBUG 3d qj:4[f  
#define new DEBUG_NEW ,k*g `OTW  
#undef THIS_FILE l2))StEm  
static char THIS_FILE[] = __FILE__; WUQlAsme  
#endif YQyf:xJ  
#define MAX_KEY 100 ~ kdxJP"  
#define CTRLBIT 0x04 2|xNT9RW  
#define ALTBIT 0x02 r Z0+mS'/G  
#define SHIFTBIT 0x01 <,%qt_ !  
#pragma data_seg("shareddata") W}<'Y@[ ,  
HHOOK hHook =NULL; lg)jc3  
UINT nHookCount =0; 1gEeZ\B-&  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 481SDG[b  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT dqU bJc]  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ?mdgY1  
static int KeyCount =0; a#iJXI  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 'eNcQJh  
#pragma data_seg() Zrtyai{8l  
HINSTANCE hins; -^m]Tb<u  
void VerifyWindow(); 29(s^#e8A  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) q[l!kC+Eh  
//{{AFX_MSG_MAP(CHookApp) A.a UWh  
// NOTE - the ClassWizard will add and remove mapping macros here. E2M|b  
// DO NOT EDIT what you see in these blocks of generated code! @Sxb}XI!f  
//}}AFX_MSG_MAP i%m]<yElm  
END_MESSAGE_MAP() kW"6Gc&HUN  
;++CMTza]  
CHookApp::CHookApp() 5&WYL  
{ ).[Mnt/Ft  
 // TODO: add construction code here, ~J}{'l1{yf  
 // Place all significant initialization in InitInstance C]ev"Am_)  
} W 7k\j&x  
1+1Z]!nG#!  
CHookApp theApp; _~?N3G  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) C NDf&dzX8  
{ [89qg+z  
 BOOL bProcessed=FALSE; K3QE>@']  
 if(HC_ACTION==nCode) 0Q^a*7w`8a  
 { Zi&qa+F  
  if((lParam&0xc0000000)==0xc0000000){// Key up Nf.6:=  
   switch(wParam) 'l+).},  
   { W\V'o Vt  
    case VK_MENU: xE$(I<:  
     MaskBits&=~ALTBIT; cO9aT  
     break; _`4jzJ*  
    case VK_CONTROL: 2!Ip!IQ:  
     MaskBits&=~CTRLBIT; pIKQx5;  
     break; y8=(k}=3  
    case VK_SHIFT: vs3px1Xe#  
     MaskBits&=~SHIFTBIT; Xr54/.{&@  
     break; 6%/@b`vZ  
    default: //judge the key and send message l+e L:C!  
     break; 's.%rre%  
   } AS;EO[Vn  
   for(int index=0;index<MAX_KEY;index++){ 2b|$z"97jj  
    if(hCallWnd[index]==NULL) %d..L-`]ET  
     continue;  >'>onAIL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [ D[&aA  
    { Z^AOV:|m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); q.s2x0  
     bProcessed=TRUE; ~f/nq/8  
    } cVHv>nd#  
   } =.q Zgcg  
  } $is|B9B  
  else if((lParam&0xc000ffff)==1){ //Key down JZQT}  
   switch(wParam) Gw3H1:yo  
   { ]JQ';%dne  
    case VK_MENU: 2hOr#I$/  
     MaskBits|=ALTBIT; H5@N<v5 u  
     break; E^uWlUb{  
    case VK_CONTROL: 7M~w05tPh  
     MaskBits|=CTRLBIT; +}IOTw" O`  
     break; }yde9b?F  
    case VK_SHIFT: >heFdKq1  
     MaskBits|=SHIFTBIT; a<-'4D/  
     break; rFY% fo  
    default: //judge the key and send message oLJP@J  
     break; $O}:*.{(W  
   } +b<q4W  
   for(int index=0;index<MAX_KEY;index++) kHj|:,'sV  
   { =yn|.%b  
    if(hCallWnd[index]==NULL) < I}O_:%  
     continue; +9S_H(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !}u'%  
    { crV2T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); iHKWz)0  
     bProcessed=TRUE; ^j"*-)R  
    } PCxv_Svf  
   } i qCZIahf  
  } dA;f`Bi;Q  
  if(!bProcessed){ c< ke)@  
   for(int index=0;index<MAX_KEY;index++){ `4 Jlf!  
    if(hCallWnd[index]==NULL) *], ]E;  
     continue; wYTF:Ou^5~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7O3\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); a78&<  
   } [I*BEJ;W'  
  } .Rq|F  
 } /\=syl  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); L;a> J  
} -]1F ] d  
}@-4*5P3  
BOOL InitHotkey() B(<;]  
{ ekB!d  
 if(hHook!=NULL){ >P7|-bV  
  nHookCount++; P4vW.|@  
  return TRUE; n@9*>D U  
 } xngK_n  
 else $_N<! h*\  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ?:bW@x  
  if(hHook!=NULL) :OC`X~}Rc  
   nHookCount++; '%&i#Eb  
  return (hHook!=NULL); q4)8]Y2  
} V#!ftu#c?  
BOOL UnInit() R:7j`gHJ|9  
{ %T3L-{s5  
 if(nHookCount>1){ KF' $D:\  
  nHookCount--; YN Lc )  
  return TRUE; '5V2{k$4U  
 } qq0bIfF\4  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 52-Gk2dp  
 if(unhooked==TRUE){ chE~UQ  
  nHookCount=0; B2UQO4[w  
  hHook=NULL; pgg4<j_mn  
 } _h#SP+>  
 return unhooked; 5f&+(Wqw  
} 8+ 5-7)  
vO#4$ ,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !MNo 8dC;  
{ ]ee%=+'  
 BOOL bAdded=FALSE; gie}k)&M  
 for(int index=0;index<MAX_KEY;index++){ X9^a:7(  
  if(hCallWnd[index]==0){ &M$s@FUY  
   hCallWnd[index]=hWnd; O9>& E;`5  
   HotKey[index]=cKey; (;^VdiJ  
   HotKeyMask[index]=cMask; )M5:aSRz  
   bAdded=TRUE; kFPZ$8e  
   KeyCount++; Xrpzc~(  
   break; +R}(t{b#  
  } rSU%!E+|<  
 } ; qT~81  
 return bAdded; KD]8n]c  
} %a-:f)@  
Jq1 Zb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }a= &o6=  
{ /`yb75  
 BOOL bRemoved=FALSE; =k]RzeI  
 for(int index=0;index<MAX_KEY;index++){ <5*cc8  
  if(hCallWnd[index]==hWnd){ eup#.#J  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]kC/b^~+m  
    hCallWnd[index]=NULL; ^hOnLy2  
    HotKey[index]=0; ^J0*]k%   
    HotKeyMask[index]=0; PfTjC"`,  
    bRemoved=TRUE; D0(QZrVa  
    KeyCount--; q|)8VmVV  
    break; kJP fL s  
   } ]Y!$HT7\  
  } Jt6~L5[_s  
 } X5kIM\  
 return bRemoved; ;5tSXgGw7  
} D@T>z;  
AtNu:U$  
void VerifyWindow() e-Z+)4fH  
{ [G{{f  
 for(int i=0;i<MAX_KEY;i++){ FilHpnQCt  
  if(hCallWnd!=NULL){ W.h6g8|wx  
   if(!IsWindow(hCallWnd)){ CA[-\>J7y  
    hCallWnd=NULL; !( xeDX  
    HotKey=0; 0tVZvXgTu  
    HotKeyMask=0; l_JPkM(mJw  
    KeyCount--; pNFL;k+p}  
   } N_TWT&o4  
  } 9kj71Jp&}  
 } 4}sfJ0HhX  
} wkm;yCF+  
SEm3T4dfzf  
BOOL CHookApp::InitInstance() ,ZyTYD|7  
{  WTi8  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); OF^v;4u  
 hins=AfxGetInstanceHandle(); 9I*zgM!F  
 InitHotkey(); WlnmW(uahW  
 return CWinApp::InitInstance(); 3P C'P2  
} {<7!=@j  
r (Ab+1b  
int CHookApp::ExitInstance() +o)o4l%3  
{ E.kGBA;a?  
 VerifyWindow(); MH|!tkW>:  
 UnInit(); ES72yh]  
 return CWinApp::ExitInstance(); `mV&[`NZ  
} i,>yIPBU!  
(C/2shr 8  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ON~jt[  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 9J% ~?k  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ @ ]u nqCO  
#if _MSC_VER > 1000 3A2X1V"  
#pragma once G" &9u2k  
#endif // _MSC_VER > 1000 HJT}v/FZ  
L~fx VdUz  
class CCaptureDlg : public CDialog 0?525^   
{ :Rc>=)<7  
 // Construction E[bJ5o**#  
 public: k4te[6)  
  BOOL bTray; .]`LR@qf  
  BOOL bRegistered; 7a.$tT  
  BOOL RegisterHotkey(); >h>X/a(=~  
  UCHAR cKey; !kZ9Ox9^  
  UCHAR cMask; Rk8>Ak(/  
  void DeleteIcon(); a[iuE`  
  void AddIcon(); ur^)bp<n  
  UINT nCount; 8/X#thG  
  void SaveBmp(); w=>~pYASH  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor T-pes1Wu  
  // Dialog Data fMRBGcg7Dc  
  //{{AFX_DATA(CCaptureDlg) dD@k{5  
  enum { IDD = IDD_CAPTURE_DIALOG }; *Q=ER  
  CComboBox m_Key; U%3d_"{;  
  BOOL m_bControl; [80jG+6  
  BOOL m_bAlt; P]A>"-k  
  BOOL m_bShift; -?gr3rV@  
  CString m_Path; lNuZg9h  
  CString m_Number; *Iv.W7 [  
  //}}AFX_DATA G v(bD6Rz  
  // ClassWizard generated virtual function overrides INZycNqm,  
  //{{AFX_VIRTUAL(CCaptureDlg) JFe %W?}.D  
 public: wb^Yg9  
  virtual BOOL PreTranslateMessage(MSG* pMsg); !\wdX7%  
 protected: Oz{.>Pjn^o  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (6i)m c(  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); M^I*;{w6i  
  //}}AFX_VIRTUAL J+IQvOn_|  
  // Implementation 46c7f*1l  
 protected: ,@"Z!?e  
  HICON m_hIcon; =qH9<,p`H  
  // Generated message map functions |5|^[v   
  //{{AFX_MSG(CCaptureDlg) L|4kv  
  virtual BOOL OnInitDialog(); X6s6fu;  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); a-\\A[E  
  afx_msg void OnPaint(); qa 'YZE`  
  afx_msg HCURSOR OnQueryDragIcon(); ?eD,\G  
  virtual void OnCancel(); 5^lroC-(x  
  afx_msg void OnAbout(); j&n][=PL  
  afx_msg void OnBrowse(); Q7oJ4rIP  
  afx_msg void OnChange(); X^mv sY  
 //}}AFX_MSG cbvK;;  
 DECLARE_MESSAGE_MAP() WJvD,VMz  
}; jT/SZ|S  
#endif 9 ! [oJ3  
vUD,%@k9  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ~7aBli=  
#include "stdafx.h" ~#3h-|]*  
#include "Capture.h" UO(B>Abp  
#include "CaptureDlg.h" MJ^NRT0?b  
#include <windowsx.h> V {R<R2h1  
#pragma comment(lib,"hook.lib") g _fvbVX  
#ifdef _DEBUG xo#&&/6  
#define new DEBUG_NEW D6&fDhO27  
#undef THIS_FILE .ruGS.nS4  
static char THIS_FILE[] = __FILE__; /5M@>A^?'  
#endif \q#s/&b   
#define IDM_SHELL WM_USER+1 z-(@j;.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); GFd~..$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -AwR$<q'  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @ @$=MSN  
class CAboutDlg : public CDialog Rt!G:hy7  
{ ]Cd 1&  
 public: /VB n  
  CAboutDlg(); yU"lW{H@  
  // Dialog Data weCRhA  
  //{{AFX_DATA(CAboutDlg) (,$ H!qKy  
  enum { IDD = IDD_ABOUTBOX }; c`~aiC`l  
  //}}AFX_DATA x]umh{H~  
  // ClassWizard generated virtual function overrides O8+e: K[D  
  //{{AFX_VIRTUAL(CAboutDlg) h*2Q0GRX  
 protected: `F<)6fk  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support g0t$1cUR  
  //}}AFX_VIRTUAL W tF  
  // Implementation .&d]7@!qy  
 protected: |@pJ]  
  //{{AFX_MSG(CAboutDlg) Gs$<r~Tg  
  //}}AFX_MSG mlCw(i,  
  DECLARE_MESSAGE_MAP() 5P_%Vp`B2  
}; cF{5[?wS  
xzF@v>2S+  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) )2T?Z)"hO  
{ F*QZVg+<*X  
 //{{AFX_DATA_INIT(CAboutDlg) 5^'PjtW6  
 //}}AFX_DATA_INIT -DDH)VO  
} +f/G2qY!t  
D&_Ir>"\  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !FOPFPn  
{ VQE8hQ37  
 CDialog::DoDataExchange(pDX); "'p;Udt/Qm  
 //{{AFX_DATA_MAP(CAboutDlg) dA-ik  
 //}}AFX_DATA_MAP <V)T_  
} R?3^Kx  
S N_!o2F2  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^S!^$d*  
 //{{AFX_MSG_MAP(CAboutDlg) sl^i%xJ|l'  
 // No message handlers ~5$V8yfx h  
 //}}AFX_MSG_MAP '9cShe  
END_MESSAGE_MAP() \IY)2C<e  
T'.U?G  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) p~1,[]k  
: CDialog(CCaptureDlg::IDD, pParent) J1DX}h]  
{ b*=eMcd  
 //{{AFX_DATA_INIT(CCaptureDlg) PY7j uS[+  
  m_bControl = FALSE; H&\Ig D  
  m_bAlt = FALSE; :NJb<%$  
  m_bShift = FALSE; *IWO ,!  
  m_Path = _T("c:\\"); w^tNYN,i  
  m_Number = _T("0 picture captured."); lC&U9=7W  
  nCount=0; $/ ;:Xb=q  
  bRegistered=FALSE; g[fCvWm#d  
  bTray=FALSE; [.;$6C/?  
 //}}AFX_DATA_INIT FEgM4m.(G<  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Ho[Kxe[c  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); C;2!c  
} O-- "\4  
aW hhq@  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) s6SG%Vd  
{ e$>.x< Eq  
 CDialog::DoDataExchange(pDX); i6wLM-.)  
 //{{AFX_DATA_MAP(CCaptureDlg) 68 d\s 4  
  DDX_Control(pDX, IDC_KEY, m_Key); cA%70Y:AV  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); FyYD7E  
  DDX_Check(pDX, IDC_ALT, m_bAlt); {>[,i`)  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); :9H=D^J  
  DDX_Text(pDX, IDC_PATH, m_Path); f?: o  
  DDX_Text(pDX, IDC_NUMBER, m_Number); fis**f0  
 //}}AFX_DATA_MAP 2= FGZa*.  
} fk-zT  
KJc fbZ~  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9?<WRM3a>  
//{{AFX_MSG_MAP(CCaptureDlg) CuRYtY@9  
 ON_WM_SYSCOMMAND() TR3_!0  
 ON_WM_PAINT() @!/w'k 8  
 ON_WM_QUERYDRAGICON() vU&I,:72 H  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) HSHY0  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >?s[g)np  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 4UD7!  
//}}AFX_MSG_MAP >mRA|0$  
END_MESSAGE_MAP() to~Ap=E  
6QVdnXoG/  
BOOL CCaptureDlg::OnInitDialog() <a%9d<@m  
{ UD1R _bL}  
 CDialog::OnInitDialog(); ~oO>6  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); xaQ]Vjw  
 ASSERT(IDM_ABOUTBOX < 0xF000); ("UcjB^62  
 CMenu* pSysMenu = GetSystemMenu(FALSE); "w ] Bq0  
 if (pSysMenu != NULL) R,[ dEP  
 { B-`d7c5  
  CString strAboutMenu; o= VzVg  
  strAboutMenu.LoadString(IDS_ABOUTBOX); E O^j,x g  
  if (!strAboutMenu.IsEmpty()) e"HA.t[A  
  { j4H]HGHv  
   pSysMenu->AppendMenu(MF_SEPARATOR); ]kUF>Wp  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); BL1$ ~0  
  } EGWm0 F_  
 } nDx}6}5)  
 SetIcon(m_hIcon, TRUE); // Set big icon <PL94  
 SetIcon(m_hIcon, FALSE); // Set small icon SwHrHj  
 m_Key.SetCurSel(0); o/273I  
 RegisterHotkey(); MKIX(r( |  
 CMenu* pMenu=GetSystemMenu(FALSE); [5Zs%!Z;8N  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 0<"4W:  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ``?] 13XjK  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 3u+A/  
 return TRUE; // return TRUE unless you set the focus to a control M:V'vme)+  
} rhU]b $A  
RWM9cV5  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 2(V;OWY(@  
{ X5i?B b.  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) v|Y:'5`V  
 { k2{*WF  
  CAboutDlg dlgAbout; 5tUp[/]pl  
  dlgAbout.DoModal(); h^ wu8E   
 } ^PDz"L<*  
 else RGd@3OjN  
 { aOZSX3;wg  
  CDialog::OnSysCommand(nID, lParam); {RFpTh7f:  
 } %5<uQc9  
} AA[(rw  
9m^"ca  
void CCaptureDlg::OnPaint() ktX\{g!U  
{ I6?n>  
 if (IsIconic()) LbX>@2(&  
 { Tjba @^T  
  CPaintDC dc(this); // device context for painting 7=yV8.cD  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Zd$a}~4~  
  // Center icon in client rectangle ,h1 z8.wD|  
  int cxIcon = GetSystemMetrics(SM_CXICON); feg  
  int cyIcon = GetSystemMetrics(SM_CYICON); )/VhkSXbG!  
  CRect rect; 67Z@Hg  
  GetClientRect(&rect); 5~GHAi  
  int x = (rect.Width() - cxIcon + 1) / 2; n/$1&x1  
  int y = (rect.Height() - cyIcon + 1) / 2; k=D_9_  
  // Draw the icon &&Ruy(&]I  
  dc.DrawIcon(x, y, m_hIcon); .}'49=c  
 } t"[ xx_i  
 else t){})nZ/4  
 { dq d:V$o  
  CDialog::OnPaint(); m$b5Vqq  
 } 8Mx+tA  
} /[ _aw&W}Z  
^2C)Wk$  
HCURSOR CCaptureDlg::OnQueryDragIcon() -1'O  
{ hKa<9>MI`  
 return (HCURSOR) m_hIcon; kY d'6+m  
} :iW+CD)j  
~*aPeJ  
void CCaptureDlg::OnCancel() !EO*xxQ  
{ f|U;4{ k  
 if(bTray) s|*0cK!K^  
  DeleteIcon(); cE (P^;7D  
  CDialog::OnCancel(); 9i+OYWUO  
} Cq mtO?vne  
'T G43^  
void CCaptureDlg::OnAbout() }G8gk"st  
{ z4 GcS/3K  
 CAboutDlg dlg; _:(RkS!x  
 dlg.DoModal(); kn2s,%\`<p  
} @PH`Wn#S  
Ht >5R  
void CCaptureDlg::OnBrowse() Da.eVU;  
{ U$zd3a_(  
 CString str; lG[@s 'j  
 BROWSEINFO bi; =j,2  
 char name[MAX_PATH]; -G\svwv@)  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); $;GH -+  
 bi.hwndOwner=GetSafeHwnd(); Vl"20):  
 bi.pszDisplayName=name; Ltv!;^Q5  
 bi.lpszTitle="Select folder"; 3y#0Lb-y  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; T!![7Rs  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); c~1+5&  
 if(idl==NULL) 0PfjD  
  return; B49: R >  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 6-"@j@l5<  
 str.ReleaseBuffer(); Vr/UY79  
 m_Path=str; 'mwgHo<u  
 if(str.GetAt(str.GetLength()-1)!='\\') Q,pnh!.-c  
  m_Path+="\\"; "==fWf  
 UpdateData(FALSE); =rL%P~0wq  
} jh7-Fl`  
I8ZBs0sfF{  
void CCaptureDlg::SaveBmp() zG IxmJ.  
{ 1f 3c3PJ  
 CDC dc; [)efh9P*  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); S($8_u$U  
 CBitmap bm; Oy(f h%k#  
 int Width=GetSystemMetrics(SM_CXSCREEN); <Z b~tYp  
 int Height=GetSystemMetrics(SM_CYSCREEN); pl#2J A8  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 244[a] %&;  
 CDC tdc; 4gR;,%E\TO  
 tdc.CreateCompatibleDC(&dc); @k+&89@G  
 CBitmap*pOld=tdc.SelectObject(&bm); +Tf4SJ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Gm`#0)VC  
 tdc.SelectObject(pOld); zWs ("L(#s  
 BITMAP btm; G_ -8*.  
 bm.GetBitmap(&btm); `kE ;V!n?  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; o]R*6$  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); '{>R-}o[3  
 BITMAPINFOHEADER bih; sej$$m R  
 bih.biBitCount=btm.bmBitsPixel; 7uUo DM  
 bih.biClrImportant=0; (5rfeSA^  
 bih.biClrUsed=0; MUQj7.rNa  
 bih.biCompression=0; + *xi&|%  
 bih.biHeight=btm.bmHeight; X RQz~Py  
 bih.biPlanes=1; H18.)yHX  
 bih.biSize=sizeof(BITMAPINFOHEADER); LyRbD$m  
 bih.biSizeImage=size; "O}u2B b  
 bih.biWidth=btm.bmWidth; ;?h+8Z/{  
 bih.biXPelsPerMeter=0; K*!qt(D&  
 bih.biYPelsPerMeter=0; `;~A  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); QsemN7B "<  
 static int filecount=0; *F:)S"3_~e  
 CString name; gT-"=AsxZQ  
 name.Format("pict%04d.bmp",filecount++); \iP=V3  
 name=m_Path+name; NIo!WOi  
 BITMAPFILEHEADER bfh; Uf}u`"$F  
 bfh.bfReserved1=bfh.bfReserved2=0; }xa~U,#5  
 bfh.bfType=((WORD)('M'<< 8)|'B'); L'?7~Cdls  
 bfh.bfSize=54+size; n0a|GZyO]  
 bfh.bfOffBits=54; !"d"3coQ?  
 CFile bf; 'w$jVX/  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ FF5|qCV/z  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); IGnP#@`5]  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 5eLm  
  bf.WriteHuge(lpData,size); SSQB1c  
  bf.Close(); luWr.<1  
  nCount++; urbSprdF  
 } TCWt3\  
 GlobalFreePtr(lpData); >%\&tS'  
 if(nCount==1) $-i(xnU/nl  
  m_Number.Format("%d picture captured.",nCount); JGHQzC  
 else Ndz'^c  
  m_Number.Format("%d pictures captured.",nCount); saa3BuV 6  
  UpdateData(FALSE); 5:yRFzhqd  
} ]t"X~  
% lK/2-  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) f1$'av  
{ {j8M78}3  
 if(pMsg -> message == WM_KEYDOWN) [4 v1 N  
 { yM2}J s C  
  if(pMsg -> wParam == VK_ESCAPE) w}qLI4  
   return TRUE; _LSp \{Z  
  if(pMsg -> wParam == VK_RETURN) 1w!O&kn  
   return TRUE; jct|}U  
 } agGgj>DDd  
 return CDialog::PreTranslateMessage(pMsg); 8=MNzcA }  
} PjG^L FX  
H~NK:qRzK  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 11iV{ h  
{ Y*QoD9<T?;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ wgUgNwd1  
  SaveBmp(); kNd(KQ<.17  
  return FALSE; ^wIg|Gc  
} 64UrD{$o  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ oTN:Q"oK7?  
 CMenu pop; z&c|2L-u6  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 5 W!#,jz  
 CMenu*pMenu=pop.GetSubMenu(0); /O}lSXo6E  
 pMenu->SetDefaultItem(ID_EXITICON); : i{tqY%  
 CPoint pt; tMiy`CPh  
 GetCursorPos(&pt);  3 GL,=q  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ) ^`V{iD  
 if(id==ID_EXITICON) G]n_RP$G  
  DeleteIcon();  Al1}Ir   
 else if(id==ID_EXIT) U#G<cV79  
  OnCancel(); 2!_DkE  
 return FALSE; 8F K%7\V  
} 2Krh&  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); SE$~Wbj?  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) /.WIED}>  
 AddIcon(); FnPn#Cv>*  
 return res; U4N H9-U'  
} zRMz8IC.  
r"9hpZH  
void CCaptureDlg::AddIcon() I {%Y0S  
{ R > [2*o"  
 NOTIFYICONDATA data; VkkC;/BBW  
 data.cbSize=sizeof(NOTIFYICONDATA); Jsa]RA  
 CString tip; ,4j^ lgJ  
 tip.LoadString(IDS_ICONTIP); E?0Vo%Vh  
 data.hIcon=GetIcon(0); O2:1aG  
 data.hWnd=GetSafeHwnd(); %i) 0sE T  
 strcpy(data.szTip,tip); x=03 WQ8  
 data.uCallbackMessage=IDM_SHELL; t3b M4+n  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; `x`zv1U  
 data.uID=98; .lAPlJOO  
 Shell_NotifyIcon(NIM_ADD,&data); bA1O]:`  
 ShowWindow(SW_HIDE); tM|/OJ7  
 bTray=TRUE; t)5.m}  
} if?X^j0  
e>m+@4*sn  
void CCaptureDlg::DeleteIcon() t$3B#=  
{ DYF(O-hJK  
 NOTIFYICONDATA data; QM'|k6  
 data.cbSize=sizeof(NOTIFYICONDATA); \fsNI T/  
 data.hWnd=GetSafeHwnd(); rvacCwI  
 data.uID=98; yAFt|<  
 Shell_NotifyIcon(NIM_DELETE,&data); ;\(LovUy6  
 ShowWindow(SW_SHOW); CofTTYl  
 SetForegroundWindow(); 3a[LM!  
 ShowWindow(SW_SHOWNORMAL); dZY|6  
 bTray=FALSE; l{gR6U{e  
} Kk,u{EA  
R=3|(R+kA  
void CCaptureDlg::OnChange() +K s3  
{ |\Q2L;4C  
 RegisterHotkey(); {PkR6.XhR  
} q|}O-A*wa  
<TTBIXV  
BOOL CCaptureDlg::RegisterHotkey() A34O(fE  
{ -,Js2+QZ#  
 UpdateData(); q"5\bh1"  
 UCHAR mask=0; 'ka}x~EF  
 UCHAR key=0; rd;E /:`5  
 if(m_bControl) *'*,mfk[  
  mask|=4; ?O Puv5!pI  
 if(m_bAlt) |l-O e  
  mask|=2; P!SsMo6n  
 if(m_bShift) V,% K"b=  
  mask|=1; IE3GZk+a~  
  key=Key_Table[m_Key.GetCurSel()]; Y4+ ]5;B8  
 if(bRegistered){ 1(pv 3  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); rp4{lHw>C/  
  bRegistered=FALSE; aCJ-T8?'  
 } @ULd~  
 cMask=mask; (-],VB (+  
 cKey=key; gC F9XKW  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); u_}UU 2  
 return bRegistered; K^",LCJA  
} 53$;ZO3  
5|7<ZL 3  
  四、小结 k(M"k!M  
O)ose?Z  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
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