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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: d~YDg{H  
  RU#Q<QI(  
  一、实现方法 N7Dm,Q]  
IDcu#Nz`  
  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: pcL02W|J  
2,dG Rf  
#pragma data_seg("shareddata") R1?g6. Mq  
HHOOK hHook =NULL; //钩子句柄 7CNEP2}:R  
UINT nHookCount =0; //挂接的程序数目 r@wWGbQ|L  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ,TP^i 0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 hC~lH eH  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey $zDW)%nAX  
static int KeyCount =0; |9 }G  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 1jQz%^~  
#pragma data_seg() >b<br  
H.Pts>3r(  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 } fSbH  
+-HaYB|p  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: `/0X].s#o  
Qp%kX@Z'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR IOt!A  
cKey,UCHAR cMask) <A+Yo3|7  
{ `W{Ye=|[d#  
 BOOL bAdded=FALSE; F5&4x"c  
 for(int index=0;index<MAX_KEY;index++){ fv#e 8y  
  if(hCallWnd[index]==0){ o^_z+JFwb  
   hCallWnd[index]=hWnd; (;cbgHo%}  
   HotKey[index]=cKey; ~h0SD(  
   HotKeyMask[index]=cMask; A*E$_N  
   bAdded=TRUE; dIMs{!  
   KeyCount++; N',]WZ}  
   break; LV'v7 2yUH  
  } P4ot, Q4  
 } @ttcFX1:W  
 return bAdded; #%B1, .A  
} k45xtKS>d  
//删除热键 t$rWE|+_z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) e-\J!E'1F  
{  X1y1  
 BOOL bRemoved=FALSE; 3|g'1X}  
 for(int index=0;index<MAX_KEY;index++){ ; #e-pkV  
  if(hCallWnd[index]==hWnd){ prhFA3 rW.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 's!EAqCN  
    hCallWnd[index]=NULL; HI)ks~E/  
    HotKey[index]=0; t9W_ [_a9  
    HotKeyMask[index]=0; '<$(*  
    bRemoved=TRUE; z`m-Ca>6  
    KeyCount--; i#&]{]}Qv  
    break; [Gysx  
   } h`?0=:Tru  
  } [m!$01=  
 } Z'PL?;&+R  
 return bRemoved; =`Nnd@3v  
} .KTDQA\  
); 7csh%  
+TA(crD  
  DLL中的钩子函数如下: axonqSf  
Z9 }qds6 y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  NM  
{ I)O%D3wfMW  
 BOOL bProcessed=FALSE; h$4V5V  
 if(HC_ACTION==nCode) #](ML:!  
 { 3zMmpeq  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 U~!97,|ic  
   switch(wParam) "n:L<F,g  
   {  YtxBkKiJ2V  
    case VK_MENU: 5/>G)&  
     MaskBits&=~ALTBIT; SL>>]A,E<`  
     break; W;OxH"eC  
    case VK_CONTROL: Ed.~9*m  
     MaskBits&=~CTRLBIT; qeH#c=DQ  
     break; )u'oI_  
    case VK_SHIFT: g}L2\i688  
     MaskBits&=~SHIFTBIT; DZ(e^vq  
     break; [&3G `8hY  
    default: //judge the key and send message VDCrFZ!]  
     break; qA Jgz7=c  
   } 6(<AuhFu  
   for(int index=0;index<MAX_KEY;index++){ nu4GK}xI  
    if(hCallWnd[index]==NULL) d\'M ~VQ  
     continue; =r:D]?8oC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U_Emp[  
    { gXc&uR0S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); w'?uJW  
     bProcessed=TRUE; (*^_ wq-;  
    } ;'p X1T  
   }  }m\  
  } }eULcgRG  
  else if((lParam&0xc000ffff)==1){ //有键按下 e J2wK3R  
   switch(wParam) ]ZHC*r2i  
   { Gk'J'9*  
    case VK_MENU: yrE|cH'f0  
     MaskBits|=ALTBIT; JG0TbM1(Bt  
     break; xa5I{<<U  
    case VK_CONTROL: rM_8piD  
     MaskBits|=CTRLBIT; /8 Ca8Ju  
     break; 3:dQN;=  
    case VK_SHIFT: e9o(hL  
     MaskBits|=SHIFTBIT; )xT_RBR  
     break; !NZFo S~  
    default: //judge the key and send message -8#Of)W  
     break; r#d~($[93  
   } "&77`R  
   for(int index=0;index<MAX_KEY;index++){ C4#'`8E  
    if(hCallWnd[index]==NULL) .2Y"=|NdA  
     continue; uRxo,.}c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Vdh5s292h  
    { CQ"5bnR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Wd3/Y/MD  
     bProcessed=TRUE; P0 hC4Sxf  
    } ` ~VV1  
   } l2X'4_d  
  } <Mxy&9}ic  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 %dhnp9'  
   for(int index=0;index<MAX_KEY;index++){ +p>tO\mo  
    if(hCallWnd[index]==NULL) QEm6#y  
     continue; Jd7+~isu~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) vsRn \Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); vqJiMa j@Z  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 [Xg?sdQCI  
   } |J?KHI  
  } b: +.Y$%F-  
 } WVir[Kv%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <x53b/ft  
} T%VC$u4F  
3l-8TR  
  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: &3:-(:<U  
z|<6y~5,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); > CZ|Vx  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l]uF!']f  
Oz-X}eM  
  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: \L<Hy)l  
,1a6u3f,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Nw/4z$].J  
{ l _dWS9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) zw_Xh~4"b  
 { [K9l>O  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ;S7MP`o@  
  SaveBmp(); +A>>Ak|s  
  return FALSE; ?<%GY dus  
 } u$X [=  
 …… //其它处理及默认处理 3ktjMVy\  
} &&nvv&a  
`gDpb.=Y  
J4;w9[a$  
  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。 g~rZ=  
:54ik,l  
  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。 LkK%DY  
Hca vA{H  
  二、编程步骤 }i^]uW*h  
tMR&>hM  
  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"; &'TZU"_  
sC(IeGbX  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; $^?Mip  
.hzzoLI2  
  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; zn@<>o8hU  
; $i{>mDT  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; zogw1g&C  
hs!a'E  
  5、 添加代码,编译运行程序。 @!"w.@ Y  
{P&{+`sov  
三、程序代码 iqreIMWz  
| (JxtQqQg  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL =8?y$WE  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ?\"GT]5D  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ V|gW%Z,j  
#if _MSC_VER > 1000 Nj rF":'Y  
#pragma once @n"7L2wY  
#endif // _MSC_VER > 1000 ? %XTD39  
#ifndef __AFXWIN_H__ %JF^@\E!|  
#error include 'stdafx.h' before including this file for PCH C& BRyo  
#endif `*g(_EZsS  
#include "resource.h" // main symbols ,&e0~  
class CHookApp : public CWinApp 'y[74?1  
{ ($pNOG H  
 public: MKf|(6;~  
  CHookApp(); ?x1sm"]p'  
  // Overrides _kg<K D=P  
  // ClassWizard generated virtual function overrides %UT5KYd!=N  
  //{{AFX_VIRTUAL(CHookApp) 't.I YBHx  
 public: n?!XNXb  
  virtual BOOL InitInstance(); kVz9}Xp"  
  virtual int ExitInstance(); Yd'Fhvo8  
  //}}AFX_VIRTUAL mvgsf(a*'  
  //{{AFX_MSG(CHookApp) Tsch:r S  
  // NOTE - the ClassWizard will add and remove member functions here. 6Ri+DPf:  
  // DO NOT EDIT what you see in these blocks of generated code ! [ R  
  //}}AFX_MSG b 5<&hN4g  
  DECLARE_MESSAGE_MAP() 8eq*q   
}; c<bV3,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); U*(/eEtd-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >HNBTc=~t  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ne#FBRu5  
BOOL InitHotkey(); kl%%b"h'  
BOOL UnInit(); `@TWZ%f6  
#endif d9e_slx  
Kh&W\\K  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 'K&^y%~py,  
#include "stdafx.h" 7^)8DwAl  
#include "hook.h" -<H\VT%98  
#include <windowsx.h>  bi/ AQ^  
#ifdef _DEBUG FnxPM`Zx  
#define new DEBUG_NEW cq+G0F+H  
#undef THIS_FILE v=5H,4UMA  
static char THIS_FILE[] = __FILE__; HVjN<HIqM  
#endif Pt5"q3ec{T  
#define MAX_KEY 100 A0X'|4I  
#define CTRLBIT 0x04 *U>"_h T0  
#define ALTBIT 0x02 @n2Dt d  
#define SHIFTBIT 0x01 fE`p  
#pragma data_seg("shareddata") niC ; WK  
HHOOK hHook =NULL; C2}n &{T  
UINT nHookCount =0; V6Z~#=EQ  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey $~7uDq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 3 @ahN2  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey M^IEu }  
static int KeyCount =0; ?#s9@R1  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift -&q@|h'  
#pragma data_seg() cD.afy  
HINSTANCE hins; qlSI|@CO  
void VerifyWindow(); =jv3O.zq  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) #dA9v7  
//{{AFX_MSG_MAP(CHookApp) e~oh%l^C72  
// NOTE - the ClassWizard will add and remove mapping macros here. <<'%2q5  
// DO NOT EDIT what you see in these blocks of generated code! BOt1J_;(rO  
//}}AFX_MSG_MAP `vjn,2S}  
END_MESSAGE_MAP() )qSjI_qt5  
]31>0yj[Q  
CHookApp::CHookApp() {E=BFs  
{ Y"H'BT!b}  
 // TODO: add construction code here, ^^,cnDlm  
 // Place all significant initialization in InitInstance u00w'=pe)  
} Ic2Q<V}oq  
/cHUqn30a  
CHookApp theApp; \k4tYL5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) JuW"4R  
{ @ TJx U  
 BOOL bProcessed=FALSE; tTEw"DL_-  
 if(HC_ACTION==nCode) =csh=V@s  
 { H4B|c42  
  if((lParam&0xc0000000)==0xc0000000){// Key up F $/7X~*  
   switch(wParam) 21k,{FB'?  
   { =/5^/vwgY  
    case VK_MENU: hY5GNYDh  
     MaskBits&=~ALTBIT; i~3\jD=<  
     break; ^4/   
    case VK_CONTROL: !$u:_8  
     MaskBits&=~CTRLBIT; )J^5?A  
     break; @7HHi~1JK  
    case VK_SHIFT: F8H4R7 8>;  
     MaskBits&=~SHIFTBIT; 8:t!m>(*  
     break; G&Fe2&5!w  
    default: //judge the key and send message rU4;yy*b  
     break; NF "|*S  
   } pO?v$Rjl  
   for(int index=0;index<MAX_KEY;index++){ #| pn,/  
    if(hCallWnd[index]==NULL) !;3hN$5  
     continue; Y`NwE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?e{hidg  
    { $E/N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); } ~NM\rm  
     bProcessed=TRUE; CCHGd&\Z  
    } Nl]_Ie6  
   } ^(kmFUV,Z  
  } 0Q7|2{  
  else if((lParam&0xc000ffff)==1){ //Key down ?K\r-J!Y  
   switch(wParam) ZH)Jq^^RI  
   { 9dVHh?E  
    case VK_MENU: lvAKL>qX  
     MaskBits|=ALTBIT; qnb#~=x^  
     break; .oS[ DTn5S  
    case VK_CONTROL: ARUzEo gcf  
     MaskBits|=CTRLBIT; e0<Wed  
     break; ;fW`#aE  
    case VK_SHIFT: BOfl hoUX  
     MaskBits|=SHIFTBIT; M!YGv   
     break; bMq)[8,N  
    default: //judge the key and send message 15z(hzU?#  
     break; IayF<y,8  
   } R]&lVXyH  
   for(int index=0;index<MAX_KEY;index++) S5BS![-QK  
   { 6t\0Ui  
    if(hCallWnd[index]==NULL) G %A!yV  
     continue; enGZb&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~9y/MR  
    { M ~ ;]d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |(<A)C  
     bProcessed=TRUE; vA"LV+@  
    } /HH_Zi0?N|  
   } .wV-g:2  
  } ;il+C!6zpf  
  if(!bProcessed){ A]laS7Q  
   for(int index=0;index<MAX_KEY;index++){ 00B,1Q HP  
    if(hCallWnd[index]==NULL) 82)%`$yZw[  
     continue; *ESi~7;#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]GT+UX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); KV8Ok  
   } w5 #;Lm  
  } %I=/ y  
 } wRdN(`;v  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Tn"@u&P *  
} {%_D> y  
W|Cs{rBc?  
BOOL InitHotkey() 99\lZ{f(  
{ ov<vSc<u  
 if(hHook!=NULL){ O7]kcA  
  nHookCount++; nx(jYXVT  
  return TRUE; T[evh]koB  
 } C#V_Gb  
 else }hE!0q~MfM  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); /PVx  
  if(hHook!=NULL) U2)?[C1q{  
   nHookCount++; 5yyc 0UG  
  return (hHook!=NULL); F}.R -j#  
} TNDp{!<|L;  
BOOL UnInit() Q@"}v_r4  
{ ]u^ybW"  
 if(nHookCount>1){ 7z_ZD0PxPc  
  nHookCount--; JXV#V7  
  return TRUE; Q\W)}  
 } o5['5?i}/  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ? o&goiM  
 if(unhooked==TRUE){ $ y(Qdb  
  nHookCount=0; _ FNW[V  
  hHook=NULL; OHwH(}H?  
 } d}aMdIF!e  
 return unhooked; G6}!PEwM  
} 7~r_nP_  
<Mndr 8 H  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I s|_  
{ ~z^49Ys:  
 BOOL bAdded=FALSE; ;?q-]J?  
 for(int index=0;index<MAX_KEY;index++){ qpQiMiB#g'  
  if(hCallWnd[index]==0){ 9K;g\? 3  
   hCallWnd[index]=hWnd; .}GOHW)}  
   HotKey[index]=cKey; *0vRVlYf  
   HotKeyMask[index]=cMask; KRX\<@  
   bAdded=TRUE; !3<b#QAXRG  
   KeyCount++; p1[|5r5Day  
   break; !<HF764@`  
  } k0&FUO  
 } 2Jky,YLcb  
 return bAdded; fRxn,HyV  
} 7|"l/s9,  
 Ci 'V  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7xM4=\~OG  
{ :]4s;q:m  
 BOOL bRemoved=FALSE; IA Ws}xIly  
 for(int index=0;index<MAX_KEY;index++){ ^F qs,^~W  
  if(hCallWnd[index]==hWnd){ \PD%=~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?VCp_Ji  
    hCallWnd[index]=NULL; $> ;|  
    HotKey[index]=0; /eT9W[a  
    HotKeyMask[index]=0; ]heVR&bQ  
    bRemoved=TRUE; xi=0 kO  
    KeyCount--; vT MCZ+^g  
    break; qo}yEl1  
   } PdEPDyFkh  
  } :fDzMD  
 } q6hH]Q>w*  
 return bRemoved; 0}YadNb7  
} +U<.MVOo.  
belBdxa{"  
void VerifyWindow() LN) yQ-  
{ L8Q/!+K  
 for(int i=0;i<MAX_KEY;i++){ o6RT4`  
  if(hCallWnd!=NULL){ x[fp7*TiG  
   if(!IsWindow(hCallWnd)){ 7L!}F;yT  
    hCallWnd=NULL; $WE=u9m  
    HotKey=0; r oPC ^Q  
    HotKeyMask=0; PT~F ^8,)  
    KeyCount--; >Hmho'  
   } me F.  
  } y<~(}xsHh  
 }  ^Y!$WP  
} H]*B5Jv~  
oGyoU#z#  
BOOL CHookApp::InitInstance() }8ESp3~e_  
{ dKP| TRd  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 4uH} SG[  
 hins=AfxGetInstanceHandle(); RameaFX8  
 InitHotkey(); Unansk  
 return CWinApp::InitInstance(); dNCd-ep  
} 's5H_ah  
K47.zu  
int CHookApp::ExitInstance() ,<C~DSAyZ  
{ >l=jJTJ;q  
 VerifyWindow(); rLY I\  
 UnInit(); I. Xbowl  
 return CWinApp::ExitInstance(); C?MKb D=K  
} zlB[Eg^X  
v9!] /]U^  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *>!-t   
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 1H\5E~X   
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Ted tmX$  
#if _MSC_VER > 1000 <WbO&;%  
#pragma once S;/pm$?/  
#endif // _MSC_VER > 1000 :^qUr`)  
tR 4+]K  
class CCaptureDlg : public CDialog >p#_ L^oZ%  
{ OlptO60{ ]  
 // Construction *=]UWM~]  
 public: nv(6NV  
  BOOL bTray; fGW~xul_  
  BOOL bRegistered; Ic^ (6  
  BOOL RegisterHotkey(); .Wi%V"  
  UCHAR cKey; [w-# !X2y  
  UCHAR cMask; ?!$Dr0r  
  void DeleteIcon(); 0'Qvis[kt  
  void AddIcon(); :o87<) _F  
  UINT nCount; .Iz JJp  
  void SaveBmp(); 6JeAXj1g+  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor qVO,sKQ{  
  // Dialog Data Ef@)y&hn  
  //{{AFX_DATA(CCaptureDlg) iA`.y9'2  
  enum { IDD = IDD_CAPTURE_DIALOG }; 2f{a||  
  CComboBox m_Key; 5E 9R+N  
  BOOL m_bControl; Bk@EQdn  
  BOOL m_bAlt; :c Er{U8  
  BOOL m_bShift; ?%lfbZ  
  CString m_Path; Qs?p)3qp  
  CString m_Number; {%RwZ'  
  //}}AFX_DATA ooCfr?E  
  // ClassWizard generated virtual function overrides ~ 588md :  
  //{{AFX_VIRTUAL(CCaptureDlg) * bhb=~  
 public: [jxh$}?P  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ]GsI|se  
 protected: G)f!AuN=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !aJ6Uf%R  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); G8MLg#  
  //}}AFX_VIRTUAL Zlt,Us`  
  // Implementation jK%Lewq  
 protected: _ /Eg_dQ~@  
  HICON m_hIcon; kY9$ M8b  
  // Generated message map functions Q~n%c7  
  //{{AFX_MSG(CCaptureDlg) 3hEbM'L  
  virtual BOOL OnInitDialog(); KdzV^6K<c  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); >wFn|7\)s>  
  afx_msg void OnPaint(); 'c]Pm,Ls  
  afx_msg HCURSOR OnQueryDragIcon(); 9l|*E  
  virtual void OnCancel(); ,|;\)tT  
  afx_msg void OnAbout(); JuOCOl\  
  afx_msg void OnBrowse(); S\GxLW@x  
  afx_msg void OnChange(); e~9g~k]s  
 //}}AFX_MSG FF7?|V!Q  
 DECLARE_MESSAGE_MAP() :~ &#9  
};  tO D}&  
#endif fQ -IM/z  
*+00  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file oMYZ^b^  
#include "stdafx.h" OHnsfXO_V  
#include "Capture.h" glkH??S  
#include "CaptureDlg.h" rt?*eC1b+Z  
#include <windowsx.h> aZ|S$-}  
#pragma comment(lib,"hook.lib") W[e2J&G  
#ifdef _DEBUG bweAmSs  
#define new DEBUG_NEW 83aWMmA(1  
#undef THIS_FILE ttt4h  
static char THIS_FILE[] = __FILE__; !9.\A:G  
#endif "5Z5x%3I  
#define IDM_SHELL WM_USER+1 W@%g_V}C*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); o3NB3@uj<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  `=B v+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; mtw{7 E  
class CAboutDlg : public CDialog IJ:JH=8  
{ V@EyU/VJ  
 public: -zzT:C  
  CAboutDlg(); 2E!Q5 l!j  
  // Dialog Data *Uf>Xr&  
  //{{AFX_DATA(CAboutDlg) LY#V)f  
  enum { IDD = IDD_ABOUTBOX }; _?K,Jc8j.  
  //}}AFX_DATA d6 9dC*>  
  // ClassWizard generated virtual function overrides {h.j6  
  //{{AFX_VIRTUAL(CAboutDlg) dYlVJ_0Zr  
 protected: dl`{:ZR S  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9A|9:OdG1  
  //}}AFX_VIRTUAL 3;!!`R>e  
  // Implementation MOi1+`kwh  
 protected: :2XX~|  
  //{{AFX_MSG(CAboutDlg) r]aI=w<(f  
  //}}AFX_MSG s"2+H}u   
  DECLARE_MESSAGE_MAP() WY5HmNX3E  
}; i'1 MZ%.  
I= cayR  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) %ZDO0P !/  
{ sWKdqs  
 //{{AFX_DATA_INIT(CAboutDlg) -[h|*G.J  
 //}}AFX_DATA_INIT M=4b  
} 0< }BSv  
,,Ivey!kL  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Ka%#RNW  
{ i.KRw6  
 CDialog::DoDataExchange(pDX); Qv]rj]%  
 //{{AFX_DATA_MAP(CAboutDlg) hDBo XIK  
 //}}AFX_DATA_MAP QR<<O  
} am7~  
GNHWbC6_m  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ,s:viXk  
 //{{AFX_MSG_MAP(CAboutDlg) O3#eQs  
 // No message handlers 2 i NZz  
 //}}AFX_MSG_MAP K `A8N  
END_MESSAGE_MAP() X/m~^  
^f,%dM=i=  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Blj<|\ igc  
: CDialog(CCaptureDlg::IDD, pParent) a(G}<  
{ `lt[Q>Z  
 //{{AFX_DATA_INIT(CCaptureDlg) 4[Wwm  
  m_bControl = FALSE; R D?52\  
  m_bAlt = FALSE;  NfmHa  
  m_bShift = FALSE; $s 'n]]Wq  
  m_Path = _T("c:\\"); ,"YTG*ky  
  m_Number = _T("0 picture captured."); JBLh4c3  
  nCount=0; C 5e;U  
  bRegistered=FALSE; 7*He 8G[W  
  bTray=FALSE; =j{Kxnv  
 //}}AFX_DATA_INIT C\^,+)Y\~  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32  }_7  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 0\!v{A> I'  
} QiJ  
lnF{5zc  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {A)9ePgv!  
{ \BO6.;jA  
 CDialog::DoDataExchange(pDX); +AFBTJ  
 //{{AFX_DATA_MAP(CCaptureDlg) <\P `<  
  DDX_Control(pDX, IDC_KEY, m_Key); g0-rQA  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); )l`VE_(|  
  DDX_Check(pDX, IDC_ALT, m_bAlt); /a6i`  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 2@I0p\a  
  DDX_Text(pDX, IDC_PATH, m_Path); J6<O|ng::  
  DDX_Text(pDX, IDC_NUMBER, m_Number); HuQdQ*Q  
 //}}AFX_DATA_MAP vTIRydg2b  
} t >.=q:  
. lNf.x#u  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) EG3u)}vI  
//{{AFX_MSG_MAP(CCaptureDlg) Ynp#3 r  
 ON_WM_SYSCOMMAND() _1~pG)y$U  
 ON_WM_PAINT() o%0To{MAF-  
 ON_WM_QUERYDRAGICON() ~@T`0W-Py  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) %J1oz3n  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Jje!*?&8X  
 ON_BN_CLICKED(ID_CHANGE, OnChange) %joU}G;"  
//}}AFX_MSG_MAP JU)k+:\a  
END_MESSAGE_MAP() JY~CMR5#.O  
s#(%u t  
BOOL CCaptureDlg::OnInitDialog() *M$'dLn  
{ MT$)A:"  
 CDialog::OnInitDialog(); 8Dn~U :F/?  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); wzBw5n f\  
 ASSERT(IDM_ABOUTBOX < 0xF000); py'xB i6}v  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ) t CNp  
 if (pSysMenu != NULL) sk AF6n  
 { {i}E)Np  
  CString strAboutMenu; k+Z2)j"  
  strAboutMenu.LoadString(IDS_ABOUTBOX); !/=.~B  
  if (!strAboutMenu.IsEmpty()) zJ@^Bw;A^@  
  { ntW1 )H'o  
   pSysMenu->AppendMenu(MF_SEPARATOR); S,Tc\}  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); QZ*gR#K]Sz  
  } [ugr<[6  
 } MV07RjeS  
 SetIcon(m_hIcon, TRUE); // Set big icon G&"O)$h  
 SetIcon(m_hIcon, FALSE); // Set small icon q;7DH4;t  
 m_Key.SetCurSel(0); }]JHY P\  
 RegisterHotkey(); aM(x--UR=  
 CMenu* pMenu=GetSystemMenu(FALSE); \xQu*M:!  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 7:<A_OLi  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); h Vui.]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); !(Y,2{  
 return TRUE; // return TRUE unless you set the focus to a control G.PRPl  
} 'K#ndCGJ$  
:\y' ?d- Q  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) JV_VM{w{K  
{ f[ia0w5 m  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4yjIR?  
 { DgY !)cS  
  CAboutDlg dlgAbout; |"+Uf w^  
  dlgAbout.DoModal(); `3@?)xa  
 } l,zhBnD  
 else C2\zbC[qm  
 { A~ _2"  
  CDialog::OnSysCommand(nID, lParam); ?nWzJ5w3  
 } M}Xf<:g)  
} vo%"(!  
IDL0!cF  
void CCaptureDlg::OnPaint() FZLx.3k4  
{ Yy6$q\@rV  
 if (IsIconic()) ?Ygd|a5  
 {  Lw%_xRn)  
  CPaintDC dc(this); // device context for painting [^^Pl:+  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); vu#ZLq  
  // Center icon in client rectangle +w"?q'SnF  
  int cxIcon = GetSystemMetrics(SM_CXICON); oYt 34@{?  
  int cyIcon = GetSystemMetrics(SM_CYICON); C\B4Uu6q  
  CRect rect; 1vtC4`  
  GetClientRect(&rect); 8m=O408Q  
  int x = (rect.Width() - cxIcon + 1) / 2; OmS8cSYGc  
  int y = (rect.Height() - cyIcon + 1) / 2; ncUS8z  
  // Draw the icon GR4DxlX  
  dc.DrawIcon(x, y, m_hIcon); ZY@ntV?  
 } P(/eVD#v  
 else sx}S,aIU  
 { !&NrbiuN  
  CDialog::OnPaint(); c*\;!dbP  
 } kX8NRPW  
} +C[g>c}d  
1ANb=X|hig  
HCURSOR CCaptureDlg::OnQueryDragIcon() b6p'%;Y/  
{ , 2xv  
 return (HCURSOR) m_hIcon; Aa4Tq2G  
} ,>8w|951'  
~"NuYM#@  
void CCaptureDlg::OnCancel() &/WE{W  
{ ~E!kx  
 if(bTray) | L1+7  
  DeleteIcon(); 5t"FNL <(M  
  CDialog::OnCancel(); DfP-(Lm)  
} Iy&,1CI"]  
!a-B=pn!]  
void CCaptureDlg::OnAbout() 0!7p5  
{ ! Dj2/][  
 CAboutDlg dlg; D W^Zuu/)  
 dlg.DoModal(); ,wXmJ)/WZ  
} )*S:C   
14jN0\  
void CCaptureDlg::OnBrowse() G$%F`R[  
{ .Y"F3 R  
 CString str; 32j}ep.*  
 BROWSEINFO bi; rNTLP m  
 char name[MAX_PATH]; C4P<GtR9  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 0bT[05.  
 bi.hwndOwner=GetSafeHwnd(); KIag(!&  
 bi.pszDisplayName=name; Wpi35JrC  
 bi.lpszTitle="Select folder"; [uLs M<C  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 4+s6cQ]S`  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); RAP-vVh/C  
 if(idl==NULL) TEMxjowr  
  return; B4wRwrVI>  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); [ ~2imS  
 str.ReleaseBuffer(); j49Uj}:j  
 m_Path=str; ]JV'z<  
 if(str.GetAt(str.GetLength()-1)!='\\') ]bY]YNt{7]  
  m_Path+="\\"; (QJe-)0_y  
 UpdateData(FALSE); rp{|{>'`.q  
} x3Y)l1gh  
b*M?\ aA  
void CCaptureDlg::SaveBmp() nP]!{J]  
{ _lFw1pa#\  
 CDC dc; l $"hhI8  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); $2?j2}M  
 CBitmap bm; fe,6YXUf  
 int Width=GetSystemMetrics(SM_CXSCREEN); =I)43ah d  
 int Height=GetSystemMetrics(SM_CYSCREEN); ~~ rR< re  
 bm.CreateCompatibleBitmap(&dc,Width,Height); (6Z^0GL  
 CDC tdc; +E_yEH7_)  
 tdc.CreateCompatibleDC(&dc); {svo!pN:  
 CBitmap*pOld=tdc.SelectObject(&bm);  mPk'a  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); XW" 0:}`J  
 tdc.SelectObject(pOld); ]| +M0:2?  
 BITMAP btm; 9|#cjHf  
 bm.GetBitmap(&btm); IhYR4?e  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; JcA+ztPU  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); F!wz{i6\h  
 BITMAPINFOHEADER bih; oSC'b%  
 bih.biBitCount=btm.bmBitsPixel; -4& i t:  
 bih.biClrImportant=0; NX.xE W@  
 bih.biClrUsed=0; \ '4~@  
 bih.biCompression=0; ,0 q1Id  
 bih.biHeight=btm.bmHeight; ]MosiMJF  
 bih.biPlanes=1; h0@a"DqK  
 bih.biSize=sizeof(BITMAPINFOHEADER); f$ xp74hw3  
 bih.biSizeImage=size; @XV&^l -  
 bih.biWidth=btm.bmWidth; ACdPF_Y]  
 bih.biXPelsPerMeter=0; h%Nd89//  
 bih.biYPelsPerMeter=0; ,7]hjf_h  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); A>1$?A8Q  
 static int filecount=0; O9(z"c  
 CString name; I}3F'}JV<  
 name.Format("pict%04d.bmp",filecount++); 4^F%bXJ)  
 name=m_Path+name; N+rU|iMa.  
 BITMAPFILEHEADER bfh; '#Au~5  
 bfh.bfReserved1=bfh.bfReserved2=0; =I@t%Y  
 bfh.bfType=((WORD)('M'<< 8)|'B'); r(46jV.sD:  
 bfh.bfSize=54+size; L2ydyXIsd  
 bfh.bfOffBits=54; _y_}/  
 CFile bf; {YzCgf  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ f 7lj,GAZ  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); yXJ25Axb  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); DfD >hf/  
  bf.WriteHuge(lpData,size); Y(.e e%;,  
  bf.Close(); ]HuB%G|t1V  
  nCount++; _9 ]:0bDUo  
 } Y \-W`  
 GlobalFreePtr(lpData); 2Jd(@DcJ2C  
 if(nCount==1) u;-&r'J>  
  m_Number.Format("%d picture captured.",nCount); +*]$PVAFA  
 else iM)K:L7d  
  m_Number.Format("%d pictures captured.",nCount); 5mD8$% \8  
  UpdateData(FALSE); 7"!b5(4=  
} 'bi;Y1:  
dm4Q'u  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ` 3qf}=Z`  
{ q"u,Tnc;  
 if(pMsg -> message == WM_KEYDOWN) A iM ukd,  
 { i}sAF/  
  if(pMsg -> wParam == VK_ESCAPE) G`Nw]_ Z_  
   return TRUE; m9DFnk<D  
  if(pMsg -> wParam == VK_RETURN) }kqh[`:  
   return TRUE; 3ic /xy;}  
 } >8e)V ;  
 return CDialog::PreTranslateMessage(pMsg); Mw/9DrE7/  
} `$B?TNuch7  
~oa}gJl:}-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -WlYHW  
{ Q&eyqk   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ o utJ/~9;  
  SaveBmp(); ?,>3uD#  
  return FALSE; lFjz*g2'  
} dFy$w=  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ s5nw<V9$]  
 CMenu pop; -3{Q`@F  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )!2@v@SQ  
 CMenu*pMenu=pop.GetSubMenu(0); kGYpJg9=  
 pMenu->SetDefaultItem(ID_EXITICON); 0Z1ksfLU  
 CPoint pt; &zdS9e-fF  
 GetCursorPos(&pt); ""0 Y^M2I  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Rql/@j`JX  
 if(id==ID_EXITICON) ga 5Q  
  DeleteIcon(); 9\_AB.Z:  
 else if(id==ID_EXIT) /?'~`4!(  
  OnCancel(); K ze?@*  
 return FALSE; fp' '+R[   
} }=[p>3Dd  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); _;j1g%  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {dpC;jsW1  
 AddIcon(); w}xA@JgQ%  
 return res; @7twe;07r  
} -tj#BEC[H(  
k$3pmy*  
void CCaptureDlg::AddIcon() JU?;Kq9R  
{ .9nqJ7]  
 NOTIFYICONDATA data; yE8D^M|g  
 data.cbSize=sizeof(NOTIFYICONDATA); !kovrvM6F  
 CString tip; .xJ54Vz  
 tip.LoadString(IDS_ICONTIP); K%v:giN$l`  
 data.hIcon=GetIcon(0); D$hQ-K  
 data.hWnd=GetSafeHwnd(); 4=L>  
 strcpy(data.szTip,tip); L|CdTRgRCB  
 data.uCallbackMessage=IDM_SHELL; TEz;:*,CG  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; atTR6%!6  
 data.uID=98; L 4j#0I]lq  
 Shell_NotifyIcon(NIM_ADD,&data); "cKD#  
 ShowWindow(SW_HIDE); 3W?7hh  
 bTray=TRUE; 8R MM97@1Q  
} r3'J{-kl  
{r_HcI(h  
void CCaptureDlg::DeleteIcon() 0;bdwIP3  
{ ,a #>e  
 NOTIFYICONDATA data; }dkXRce*  
 data.cbSize=sizeof(NOTIFYICONDATA); Y) sB]!hx  
 data.hWnd=GetSafeHwnd(); )p\`H;7*V4  
 data.uID=98; ,1sbY!&ekL  
 Shell_NotifyIcon(NIM_DELETE,&data); yYP_TuNa  
 ShowWindow(SW_SHOW); D S U`(`  
 SetForegroundWindow(); qLEYBv-3  
 ShowWindow(SW_SHOWNORMAL); "iSY;y o  
 bTray=FALSE; ^ Ps!  
} FK^xZ?G  
FRQ.ix2  
void CCaptureDlg::OnChange() {-4+=7Sg1  
{ wL0[Slf}  
 RegisterHotkey(); TKB8%/_p  
} n _K1%  
d{S'6*`D  
BOOL CCaptureDlg::RegisterHotkey() c4fH/-  
{ cp`J ep<T  
 UpdateData(); #X-C~*|>j  
 UCHAR mask=0; dn 6]qW5  
 UCHAR key=0; g *Js4  
 if(m_bControl) Cbff:IP  
  mask|=4; oco,sxT  
 if(m_bAlt) z!g$#hmL>  
  mask|=2; mw"FQ?bJ  
 if(m_bShift) iB)\* )  
  mask|=1; ]? y~;-^  
  key=Key_Table[m_Key.GetCurSel()]; 5iA>Z!sP[  
 if(bRegistered){ 50_[hC&C)  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); wH~A> 4*(  
  bRegistered=FALSE; <m-(B"F X  
 } 7Eyi~jes  
 cMask=mask; 2I B{FO/  
 cKey=key; p1UloG\  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); a=MN:s?Fc0  
 return bRegistered;  0s;~9>  
} t% qep|  
 =yod  
  四、小结 ^Q8yb*MN  
UR'[?  
  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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