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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 i'u%r  
  dT)KvqX  
  一、实现方法 f 4I#a&DO  
>NRz*h#  
  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: /plUzy2Yu  
iL_F*iK5  
#pragma data_seg("shareddata") @sHw+to|p)  
HHOOK hHook =NULL; //钩子句柄 :#[_Osmf(  
UINT nHookCount =0; //挂接的程序数目 gww^?j#  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 _qeuVi=A  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ij(4)=  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey HQ3`:l  
static int KeyCount =0; @7s,| \  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 &U~r}=  
#pragma data_seg() !Gp3/<"Wy$  
_`_IUuj$E  
  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。 !e'0jf-~  
O_Rcd&<mr  
  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: U[QD!  
 aoDD&JE  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR E^ok`wfO  
cKey,UCHAR cMask) 8RAeJ~e  
{ 8M|)ojH  
 BOOL bAdded=FALSE; d BMe`hM)  
 for(int index=0;index<MAX_KEY;index++){ *fl{Y(_OO  
  if(hCallWnd[index]==0){ 6#)Jl  
   hCallWnd[index]=hWnd; T_x+sv=|X!  
   HotKey[index]=cKey; @qPyrgy  
   HotKeyMask[index]=cMask; As+;qNO  
   bAdded=TRUE; N 2"3~  #  
   KeyCount++; W/r mm*  
   break; {?/8jCVd  
  } `GQiB]Z  
 } ,![Du::1  
 return bAdded; ZJ9Jf2 c  
} P$3=i`X!nw  
//删除热键 VL7S7pb_  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  C5+`<  
{ So=nB} b[?  
 BOOL bRemoved=FALSE;  oKYhE  
 for(int index=0;index<MAX_KEY;index++){ aw/7Z`   
  if(hCallWnd[index]==hWnd){ M7DLs;sD  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ FGwnESCC  
    hCallWnd[index]=NULL; :5S |x/  
    HotKey[index]=0; x$n~f:1Y  
    HotKeyMask[index]=0; 7<:Wq=e!r  
    bRemoved=TRUE; 3_MS'&M  
    KeyCount--; V[Rrst0yo  
    break; +lW}ixt  
   } u\XkXS`  
  } 8pPC 9ew\=  
 } ^.#X<8hr  
 return bRemoved; 3kiE3*H  
} 9Yl8n dP^E  
a_{io`h3&  
0TO_1 0D  
  DLL中的钩子函数如下: eOehgU5x  
V3mjb H>F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) R3j#WgltP  
{ #*$_S@  
 BOOL bProcessed=FALSE; {^cF(7p  
 if(HC_ACTION==nCode) vx!::V7s6  
 { eA?uny f2r  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 -R&E,X7N  
   switch(wParam) ,g/ _eROJ  
   {  G#w^:UL  
    case VK_MENU: zg#m09[4  
     MaskBits&=~ALTBIT; 7G.o@p6$  
     break; VU! l50   
    case VK_CONTROL: a|QE *s.  
     MaskBits&=~CTRLBIT; /o~qC<7  
     break; *p&^!ct  
    case VK_SHIFT: m_m8c8{Y  
     MaskBits&=~SHIFTBIT; I7dm \|#  
     break; zb;(?!Bd#  
    default: //judge the key and send message #zS1Z f^KP  
     break; =#i4MXRZ{  
   } 2W3NL|P  
   for(int index=0;index<MAX_KEY;index++){ ~=:2~$gsn  
    if(hCallWnd[index]==NULL) Qj(vBo?D  
     continue; kmlG3hOR,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) NoCDY2 $  
    { R9Sf!LR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /l,+oG%\  
     bProcessed=TRUE; ?P""KVp o  
    } XM6".eF)M  
   } <NG/i i=  
  } x&C%4Y_]  
  else if((lParam&0xc000ffff)==1){ //有键按下 6<x~Mk'u)  
   switch(wParam) Xhcn]  
   { 4$ Dt8!p0  
    case VK_MENU: R_1)mPQ^P  
     MaskBits|=ALTBIT; ,VNi_.W0  
     break; D W/1 =3  
    case VK_CONTROL: J~Cc9"(  
     MaskBits|=CTRLBIT; E/mubA(&  
     break; ?YF${  
    case VK_SHIFT: |[S90Gw]  
     MaskBits|=SHIFTBIT;  hv+|s(  
     break; 4q>7OB:e  
    default: //judge the key and send message (O\U /daB  
     break; \  Md 3  
   } Fe!D%p Qv  
   for(int index=0;index<MAX_KEY;index++){ ^WE4*.(  
    if(hCallWnd[index]==NULL) +|y*}bG  
     continue; Q [r j  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @#RuSc  
    { NO-k-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 10wvfRhng  
     bProcessed=TRUE; q7X}MAW  
    } r&}(9Cq&"y  
   } U1ZIuDg'E  
  } KH7VR^;mk  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 j-7u>s-l  
   for(int index=0;index<MAX_KEY;index++){ XJqTmj3   
    if(hCallWnd[index]==NULL) >+cSPN'i>  
     continue; .VT;H1#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) d/3J' (cq  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); XC[]E)8  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 eR:b=%T8  
   } opsQn\4DZ?  
  } aaDP9FW9e  
 } )Im3'0l>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9\HR60V  
} sI_7U^"[  
eGm:)   
  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: ]' Y|N l  
!p9)CjQ"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I>PZYh'.T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kv6Cp0uFg  
>F1G!#$0  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ~h-C&G ,v  
Nln`fE/Ht  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5W/{h q8}}  
{ -LtK8wl^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) m9in1RI%  
 { pkJ/oT  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 57wFf-P  
  SaveBmp(); { ;s;.  
  return FALSE; AS)UJ/lC  
 } K]c4"JJ  
 …… //其它处理及默认处理 kb71q:[  
} j^flwk  
\v+u;6cx_  
~#R9i^Y  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 x2co>.i  
? B@&#E!/f  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 9mlIbEAb  
 Tc6:UF  
  二、编程步骤 h.)h@$d  
*U;'OWE[  
  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"; 9'?se5\  
aSC9&Nf;  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; )p<WDiX1!e  
+ WVIZZ8  
  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; _A98  
!Uh2}ic  
  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; <a4 TO8  
As~(7?]r  
  5、 添加代码,编译运行程序。 w~z[wmOkp  
#2RiLht  
三、程序代码 Y34/+Fi  
G O{ . 9_2  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL *wuqa) q2  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) !*aPEf270  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ u:&o}[  
#if _MSC_VER > 1000 ~e `Bq>  
#pragma once Kz jC/1sd  
#endif // _MSC_VER > 1000 c~0{s>  
#ifndef __AFXWIN_H__ oc7$H>ET1  
#error include 'stdafx.h' before including this file for PCH CS 8jA\  
#endif mMSh2B  
#include "resource.h" // main symbols \\06T `  
class CHookApp : public CWinApp \P;rES'  
{ o!OMm!  
 public: f$.?$  
  CHookApp(); FS6<V0pil  
  // Overrides +uo{ m~_4  
  // ClassWizard generated virtual function overrides &gtG~mp<L  
  //{{AFX_VIRTUAL(CHookApp) 4[yIOs  
 public: ?WUF!Jk  
  virtual BOOL InitInstance(); +-<}+8G;  
  virtual int ExitInstance(); W#'c 5:m 4  
  //}}AFX_VIRTUAL VA] e  
  //{{AFX_MSG(CHookApp) 1TS0X:TCn  
  // NOTE - the ClassWizard will add and remove member functions here. jCioE  
  // DO NOT EDIT what you see in these blocks of generated code ! -`b8T0?oK  
  //}}AFX_MSG `Out(Hn  
  DECLARE_MESSAGE_MAP() ]5 Qy  
}; ,1oQ cC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); slu(SmQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0* ;O?T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E<E3&;qD  
BOOL InitHotkey(); HDVW0QaMu  
BOOL UnInit(); Z(u5$<up  
#endif ~YP Jez  
X(A.X:"  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. S0d~.ah30  
#include "stdafx.h" z'7[Tie  
#include "hook.h" {2&m`D bm  
#include <windowsx.h> JIm4vS  
#ifdef _DEBUG T!RT<&  
#define new DEBUG_NEW 1PH: \0}  
#undef THIS_FILE g7\,{Bw#E  
static char THIS_FILE[] = __FILE__; ?S Z1`.S  
#endif q%(EYM5Y  
#define MAX_KEY 100 dY7'OAUyVl  
#define CTRLBIT 0x04 )+P]Vf\jH  
#define ALTBIT 0x02 jN31hDg<z  
#define SHIFTBIT 0x01 Z[Qza13lo  
#pragma data_seg("shareddata")  YZc>dE  
HHOOK hHook =NULL; Yd EptAI  
UINT nHookCount =0; 8uNULob  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey kDvc" ,SD#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 0NDftcB]  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey *\}}Bv+9  
static int KeyCount =0; mLh kI!4[  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift dS2G}L^L  
#pragma data_seg() hR#-u1C  
HINSTANCE hins; F&RgT1*  
void VerifyWindow(); L< ^j"!0  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) = ?D(g  
//{{AFX_MSG_MAP(CHookApp) tVuWVJ4M  
// NOTE - the ClassWizard will add and remove mapping macros here. _"@CGXu  
// DO NOT EDIT what you see in these blocks of generated code! ;0rGiWC#  
//}}AFX_MSG_MAP 'e)^m}:?D  
END_MESSAGE_MAP() j/`94'Y  
k%s_0 @  
CHookApp::CHookApp() <BFQ:  
{ M`YWn ;  
 // TODO: add construction code here, >Fio;cn?  
 // Place all significant initialization in InitInstance 54lu2gD'  
} mw$r$C{  
aNcd` $0  
CHookApp theApp; S$TmZk=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) fyTAou6hI  
{ {8$=[;  
 BOOL bProcessed=FALSE; N|N3x7=gs  
 if(HC_ACTION==nCode) MP Z3D9  
 { 5 @U<I  
  if((lParam&0xc0000000)==0xc0000000){// Key up 3E3U /K  
   switch(wParam) sUZX }  
   { [^CV>RuO  
    case VK_MENU: [.se|]t7X  
     MaskBits&=~ALTBIT; Od+6 -J  
     break; [x=jH>Y  
    case VK_CONTROL: Kl7WQg,XOi  
     MaskBits&=~CTRLBIT; PyVC}dUAX  
     break; %^sTU4D5  
    case VK_SHIFT: 1"Z@Q`}  
     MaskBits&=~SHIFTBIT; 4iA Z+l5&  
     break; 'c2W}$q  
    default: //judge the key and send message De7T s  
     break; -9N@$+T  
   } *B`Zq)  
   for(int index=0;index<MAX_KEY;index++){ gE#>RM5D  
    if(hCallWnd[index]==NULL) j',W 64  
     continue; k@zy  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v+p {|X-  
    { d->|EJP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); B9p?8.[  
     bProcessed=TRUE; zp\8_U @  
    } CYOI.#m2  
   } db'/`JeK b  
  } 4XVCHs(  
  else if((lParam&0xc000ffff)==1){ //Key down X%yO5c\l2  
   switch(wParam) ]7-&V-Ct*  
   { F, U*yj  
    case VK_MENU: SGb;!T *  
     MaskBits|=ALTBIT; =*p/F  
     break; *8~86u GU  
    case VK_CONTROL: (c0A.L)  
     MaskBits|=CTRLBIT; ;iDPn2?6?x  
     break; N0hE4t  
    case VK_SHIFT: ::_i@r  
     MaskBits|=SHIFTBIT; fXrXV~'8  
     break; 93t9^9  
    default: //judge the key and send message _|h8q-[3  
     break; /mo(_  
   } s4&^D<  
   for(int index=0;index<MAX_KEY;index++) h-iJlm  
   { rG,5[/l  
    if(hCallWnd[index]==NULL) LYlDc;<A  
     continue; UK9@oCIB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \fr-<5w79  
    { ^C2\`jLMY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); gV&z2S~"  
     bProcessed=TRUE; +`?Y?L^ J  
    } WJI[9@^I~  
   } A?Bif;  
  } ECv)v  
  if(!bProcessed){ l5L.5 $N  
   for(int index=0;index<MAX_KEY;index++){ ^vG8#A}]  
    if(hCallWnd[index]==NULL) <uj 8lctmP  
     continue; pp9Zb.D\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) mPq$?gdp  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wAnb Di{W  
   } !w&kyW?e  
  } 2^?:&1:  
 } v4@Z(M  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  }fp-5  
} 3fN.bU9_  
B"%{i-v>**  
BOOL InitHotkey() AT5aDEb^^  
{ c-.t>r &  
 if(hHook!=NULL){ $-[CG7VgX%  
  nHookCount++; 1S@vGq}  
  return TRUE; JxyB(  
 } q^6+!&"  
 else A*W) bZs.  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 6e7{Iy  
  if(hHook!=NULL) )7_"wD` z  
   nHookCount++; GR\5WypoJ  
  return (hHook!=NULL); DY[$"8Kxcp  
} YM5fyv?  
BOOL UnInit() y"Nsh>h  
{ a# c6[!   
 if(nHookCount>1){ ^ns@O+Fk  
  nHookCount--; eb*#'\~'  
  return TRUE; ayAo^q  
 } {3&|tk!*  
 BOOL unhooked = UnhookWindowsHookEx(hHook); c'*a{CV4P  
 if(unhooked==TRUE){ ZyEHzM{$  
  nHookCount=0; Qt|c1@J  
  hHook=NULL; ?McQr1  
 } 4 B*0M  
 return unhooked; s3W@WH^.  
} O:da-xWJ  
TRsE %  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) < })'Y~i  
{ _'#x^D  
 BOOL bAdded=FALSE; NKQOUw:qn  
 for(int index=0;index<MAX_KEY;index++){ n-DVT;y  
  if(hCallWnd[index]==0){ Z}-Vf$O~  
   hCallWnd[index]=hWnd; x\QY@9  
   HotKey[index]=cKey; SXt{k<|  
   HotKeyMask[index]=cMask; .; &# )l  
   bAdded=TRUE; f-r] |k  
   KeyCount++; KM`eIw>8  
   break; x"~~l  
  } $Y 7c  
 } Y6&wJ<   
 return bAdded; g (#f:"  
} }MlwC;ot  
HI@syFaJM  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) DLCkM*'  
{ b"TjGE  
 BOOL bRemoved=FALSE; {aM<{_v  
 for(int index=0;index<MAX_KEY;index++){ Ja ,Cvt  
  if(hCallWnd[index]==hWnd){ k^OV56  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +}-@@,  
    hCallWnd[index]=NULL; Z y_V9j[n  
    HotKey[index]=0; M?;y\vS?.  
    HotKeyMask[index]=0; +&["HoKg}&  
    bRemoved=TRUE; b=/curl&  
    KeyCount--; Zk[&IBE_  
    break; JH8zF{?  
   } q7&6r|w1I  
  } R<V!%rL;;  
 } D$JHs4  
 return bRemoved; ~(]0k.\  
} #Z5}2soA  
Iuh/I +[7  
void VerifyWindow() c*R/]Dn   
{ ?Mee 6  
 for(int i=0;i<MAX_KEY;i++){ 'FYJMIs  
  if(hCallWnd!=NULL){ xz:J  
   if(!IsWindow(hCallWnd)){ y_.!!@,  
    hCallWnd=NULL; QFIL)'K  
    HotKey=0; h;jIYxj  
    HotKeyMask=0; (#;`"Yu  
    KeyCount--; %E_b'[8  
   } ]G2uk`  
  } -J^(eog[6  
 } mLL340c#\  
} 1LJUr"6]  
{?`al5Sz  
BOOL CHookApp::InitInstance() -@ZiS^l  
{ mRZ :ie  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ]f1{n  
 hins=AfxGetInstanceHandle(); _.-;5M-  
 InitHotkey(); =r@vc  
 return CWinApp::InitInstance(); z'`y,8Y1l  
} F0690v0mB[  
f#Xyoa%  
int CHookApp::ExitInstance() sUYxT>R  
{ ,<2DL p%%D  
 VerifyWindow(); w/L `  
 UnInit(); TFcT3]R[rL  
 return CWinApp::ExitInstance(); KOwOIDt  
} pn*3\  
Q#EP|  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Sv;_HZ  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) m%PC8bf`S  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Ig5L$bAM~  
#if _MSC_VER > 1000 P<K){V  
#pragma once HfLLlH<L`&  
#endif // _MSC_VER > 1000 $u/E\l  
lKgKtQpi  
class CCaptureDlg : public CDialog Dn>%%K@0  
{ !*`-iQo&  
 // Construction 7G)H.L)$m"  
 public: M,5"b+mX[~  
  BOOL bTray; !'Q -yoHKD  
  BOOL bRegistered; |A8/FU2{  
  BOOL RegisterHotkey(); WF\)fc#;_o  
  UCHAR cKey; ZR\VCVH\^  
  UCHAR cMask; 21(p|`X  
  void DeleteIcon(); sFBneBub  
  void AddIcon(); 1[ ]&(Pa  
  UINT nCount; %e@HZ"V  
  void SaveBmp(); |!F5.%PY  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor A?G^\I~v  
  // Dialog Data !yhh8p3  
  //{{AFX_DATA(CCaptureDlg) aAy'\T$x.  
  enum { IDD = IDD_CAPTURE_DIALOG }; |T{C,"9y  
  CComboBox m_Key; #Eb5:;  
  BOOL m_bControl; f>ZyI{  
  BOOL m_bAlt; ^`<w&I@  
  BOOL m_bShift; t5[[JD1V  
  CString m_Path; %_Yx<wR%  
  CString m_Number; 2c/Ys4/H4]  
  //}}AFX_DATA y ^;l*qq  
  // ClassWizard generated virtual function overrides _f6HAGDN  
  //{{AFX_VIRTUAL(CCaptureDlg) iX\W;V  
 public: C4}*) a  
  virtual BOOL PreTranslateMessage(MSG* pMsg); YSaJeU>@  
 protected: D/=5tOy  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support X=C1/4wU  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &[&r2 >a  
  //}}AFX_VIRTUAL 0 u?{ \  
  // Implementation vF?5].T  
 protected: [ 4;Ii  
  HICON m_hIcon; }za[E>z  
  // Generated message map functions *|_"W+JC  
  //{{AFX_MSG(CCaptureDlg) Z/ Tm)Xd  
  virtual BOOL OnInitDialog(); ?<* -j4v  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 9 fMau  
  afx_msg void OnPaint(); K\)Td+~jc  
  afx_msg HCURSOR OnQueryDragIcon(); kg`.[{k  
  virtual void OnCancel(); >Yt/]ta4+  
  afx_msg void OnAbout(); iKas/8   
  afx_msg void OnBrowse(); phE &7*!Q  
  afx_msg void OnChange(); FW"^99mrnb  
 //}}AFX_MSG "6a8s;  
 DECLARE_MESSAGE_MAP() W(hMft%  
}; vLxQ *50v$  
#endif r",]Voibd  
c/ 5W4_J  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file xm6EKp:  
#include "stdafx.h" F:#J:x'  
#include "Capture.h" oDcKtB+2  
#include "CaptureDlg.h" ?:Y#Tbi3  
#include <windowsx.h> 7#<c>~   
#pragma comment(lib,"hook.lib") w{dIFvQ"$  
#ifdef _DEBUG |7KeR-  
#define new DEBUG_NEW x3rlJs`$;  
#undef THIS_FILE 8t=(,^c  
static char THIS_FILE[] = __FILE__; _ %%Z6x(  
#endif YJ:3!B>Zo  
#define IDM_SHELL WM_USER+1 +ki{H}G21  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,&4qgp{)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i55x`>]&sb  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [&*6_q"V  
class CAboutDlg : public CDialog 2m>-dqg  
{ l6kmS  
 public: AfC>Q!-w  
  CAboutDlg(); .qA{xbu  
  // Dialog Data 1&:@  
  //{{AFX_DATA(CAboutDlg) % },Pe  
  enum { IDD = IDD_ABOUTBOX }; B4XZko(  
  //}}AFX_DATA gKg-O  
  // ClassWizard generated virtual function overrides [j4v]PE  
  //{{AFX_VIRTUAL(CAboutDlg) Eq:2k)BE  
 protected: oQ=>'w  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3 DaQo0N  
  //}}AFX_VIRTUAL =_]2&(?  
  // Implementation "S&%w8V  
 protected: >]=j'+]  
  //{{AFX_MSG(CAboutDlg) *;|`E(   
  //}}AFX_MSG $0^P0RAH  
  DECLARE_MESSAGE_MAP() {7Mj P+\  
}; !,Zp? g)  
V3mAvmx  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) P IXL6  
{ {RB-lfrWs  
 //{{AFX_DATA_INIT(CAboutDlg) \Ey~3&x9f  
 //}}AFX_DATA_INIT Dr;iQkGP  
} )~jqW=d 2  
K) Zlc0e  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) #'4OYY.  
{ =:+0)t=ao  
 CDialog::DoDataExchange(pDX); 9%sM*[A  
 //{{AFX_DATA_MAP(CAboutDlg) DF{OnF  
 //}}AFX_DATA_MAP 0Aa`p3.)  
} YK{a  
abxDB  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) NcCvm#  
 //{{AFX_MSG_MAP(CAboutDlg) [_xyl e  
 // No message handlers dGwszziuK  
 //}}AFX_MSG_MAP ]S 7^ITn  
END_MESSAGE_MAP() 0J~Qq]g  
FEz>[#eOX  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ^nVl (^{  
: CDialog(CCaptureDlg::IDD, pParent) _GqS&JHSf  
{ n-QJ;37\  
 //{{AFX_DATA_INIT(CCaptureDlg) 0|D&"/.R#!  
  m_bControl = FALSE; V[a[i>,Z  
  m_bAlt = FALSE; >"3>fche  
  m_bShift = FALSE; 9SMiJad<  
  m_Path = _T("c:\\"); r.0oxH']  
  m_Number = _T("0 picture captured."); A"Q@W<.  
  nCount=0; *^ \FIUd  
  bRegistered=FALSE; 2i|B=D(  
  bTray=FALSE; %]p6Kn/>  
 //}}AFX_DATA_INIT c<+;4z  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 %f8Qa"j  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); @U -$dw'4  
} +rWZ|&r%  
G%# 05jH  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) TOLl@p]lU  
{ }jSj+*  
 CDialog::DoDataExchange(pDX); x?D/.vrOY  
 //{{AFX_DATA_MAP(CCaptureDlg) bl/,*Wx:4.  
  DDX_Control(pDX, IDC_KEY, m_Key); T@^]i&  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); {F|48P;J  
  DDX_Check(pDX, IDC_ALT, m_bAlt); .I$}KE)  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ^;F{)bmu+)  
  DDX_Text(pDX, IDC_PATH, m_Path); ;HOPABWz)  
  DDX_Text(pDX, IDC_NUMBER, m_Number); #ZiT-  
 //}}AFX_DATA_MAP 7 gB{In0  
} u1K\@jlw  
^Jp*B;  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0"[`>K~7a8  
//{{AFX_MSG_MAP(CCaptureDlg) /vE]2Io  
 ON_WM_SYSCOMMAND() !.fw,!}hOD  
 ON_WM_PAINT() `"k9wC1  
 ON_WM_QUERYDRAGICON() 6@4n'w{"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) `#IcxweA  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) |dadH7  
 ON_BN_CLICKED(ID_CHANGE, OnChange) V:bV ?lt  
//}}AFX_MSG_MAP |Y_ -  
END_MESSAGE_MAP() `0#H]=$2h  
:46h+?   
BOOL CCaptureDlg::OnInitDialog() 0_eQlatb  
{ |)_-Bi;MW`  
 CDialog::OnInitDialog(); :u%$0p>  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); >CgO<\  
 ASSERT(IDM_ABOUTBOX < 0xF000); \|Dei);k  
 CMenu* pSysMenu = GetSystemMenu(FALSE); GO5~!g  
 if (pSysMenu != NULL) _>bRv+RVR  
 { TA}UY7v  
  CString strAboutMenu; EEf ]u7  
  strAboutMenu.LoadString(IDS_ABOUTBOX); R_D c)  
  if (!strAboutMenu.IsEmpty()) )"O{D`uX  
  { 6&2LWaWMo$  
   pSysMenu->AppendMenu(MF_SEPARATOR); 6!EYrX}rI[  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); < 8(?7QI  
  } (&&87(  
 } :cp   
 SetIcon(m_hIcon, TRUE); // Set big icon  [~Hg}-c  
 SetIcon(m_hIcon, FALSE); // Set small icon 0o&}mKe  
 m_Key.SetCurSel(0); <xS=#  
 RegisterHotkey(); |;;!8VO3J  
 CMenu* pMenu=GetSystemMenu(FALSE); f1+qXMs  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); @Z\2*1y6  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Qs+k)e,  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); >R,?hWT  
 return TRUE; // return TRUE unless you set the focus to a control jOtX 60;  
} {w`:KR6o7  
_LfHs1g4  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) heD,& OX  
{ 9]_GNk-D  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) |#5 e|z5(  
 { ;MTz]c  
  CAboutDlg dlgAbout; I>w^2 (y  
  dlgAbout.DoModal(); 9Yw]Y5l  
 } WO%h"'iJ  
 else M/jb}*xDR  
 { =L 0fZf  
  CDialog::OnSysCommand(nID, lParam); K^i"9D)A  
 } T'rjh"C&|  
} O25m k X  
%]Cjhs"v  
void CCaptureDlg::OnPaint() @sf 90&f  
{ ]O!s 'lC  
 if (IsIconic()) fCEz-TMW  
 { CD?&<NV  
  CPaintDC dc(this); // device context for painting (M% ;~y\  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); QdDtvJLf  
  // Center icon in client rectangle ,# "(Z  
  int cxIcon = GetSystemMetrics(SM_CXICON); ^Qh-(u`  
  int cyIcon = GetSystemMetrics(SM_CYICON); K=kH%ZK  
  CRect rect; , Fytk34  
  GetClientRect(&rect); EZ% .M*?  
  int x = (rect.Width() - cxIcon + 1) / 2; g_D-(J`IK,  
  int y = (rect.Height() - cyIcon + 1) / 2; s'2Rs^,hN  
  // Draw the icon S=R 3"~p  
  dc.DrawIcon(x, y, m_hIcon); lpEDPvD_Vm  
 } kHU"AD}.  
 else _Dq Qfc%  
 { !7` [i  
  CDialog::OnPaint(); \5[-Ml  
 } Kd{#r/HZ  
} r<FQX3  
0o68rF5^s  
HCURSOR CCaptureDlg::OnQueryDragIcon() cgNt_8qC  
{ ~ v1W  
 return (HCURSOR) m_hIcon; `Wf5  
} $Qq_qTJu?G  
 ~u/@rqF  
void CCaptureDlg::OnCancel() 41;)-(1  
{ ic~Z_?p  
 if(bTray) k46gY7y,9  
  DeleteIcon(); 9.Ap~Ay.  
  CDialog::OnCancel(); Kx]> fHK  
} #Go(tS~o  
W]LQ &f  
void CCaptureDlg::OnAbout() <3#<I)#  
{ ;nf&c;D  
 CAboutDlg dlg; Iu6W=A  
 dlg.DoModal(); Z t`j\^4n  
} EX 9Z{xX  
W'G{K\(/  
void CCaptureDlg::OnBrowse() Nu. (viQ}  
{ -931'W[s,  
 CString str; |e"/Mf[  
 BROWSEINFO bi; OWV/kz5'H  
 char name[MAX_PATH]; i ^S2%qz  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); y*KC*/'"  
 bi.hwndOwner=GetSafeHwnd(); PdM*5g4  
 bi.pszDisplayName=name; '(9YB9 i  
 bi.lpszTitle="Select folder"; ]piM/v\  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; .v7`$(T  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6~:+:;  
 if(idl==NULL) >x?2Fz.  
  return; \L#QR  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "w^Nu6  
 str.ReleaseBuffer(); & >b+loF  
 m_Path=str; _sm;HH7'*  
 if(str.GetAt(str.GetLength()-1)!='\\') 4Bo<4 4-,  
  m_Path+="\\"; C >kmIw'  
 UpdateData(FALSE); rys<-i(  
} /d]~ly @uI  
# `58F.  
void CCaptureDlg::SaveBmp() "8_,tYAH  
{ .P%ym~S  
 CDC dc; zW)gC9_|m-  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); >e_%M5 0  
 CBitmap bm; q4k`)?k9  
 int Width=GetSystemMetrics(SM_CXSCREEN); k1wr/G'H[  
 int Height=GetSystemMetrics(SM_CYSCREEN); 9i[4"&K  
 bm.CreateCompatibleBitmap(&dc,Width,Height); fn?VNZ`J  
 CDC tdc; Okoo(dfM  
 tdc.CreateCompatibleDC(&dc); |<2 *v-a  
 CBitmap*pOld=tdc.SelectObject(&bm); 4[_L=zD  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); cI3KB-lM#  
 tdc.SelectObject(pOld); AJ4r/b }  
 BITMAP btm; Uir*%*4:  
 bm.GetBitmap(&btm); '2wCP EC  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; -4%]QS  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); <4sj@C  
 BITMAPINFOHEADER bih; kyK'  
 bih.biBitCount=btm.bmBitsPixel; sr4jQo  
 bih.biClrImportant=0; Za9$Hh/X  
 bih.biClrUsed=0; :r^klJ(m  
 bih.biCompression=0;  9^p32G  
 bih.biHeight=btm.bmHeight; @jKDj]\  
 bih.biPlanes=1; ,N0uR@GN  
 bih.biSize=sizeof(BITMAPINFOHEADER); )8bFGX7|  
 bih.biSizeImage=size; !3QRzkJX~  
 bih.biWidth=btm.bmWidth; 'FqEB]gu  
 bih.biXPelsPerMeter=0; /Bm#`?(ia  
 bih.biYPelsPerMeter=0; :F9q>  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); qdO[d|d  
 static int filecount=0; m1i4,  
 CString name; n/?eZx1  
 name.Format("pict%04d.bmp",filecount++); B MY>a  
 name=m_Path+name; kLq( !Gs  
 BITMAPFILEHEADER bfh; \P5>{ 2i  
 bfh.bfReserved1=bfh.bfReserved2=0; Y}K!`~n1S  
 bfh.bfType=((WORD)('M'<< 8)|'B'); }!=gP.Zu^  
 bfh.bfSize=54+size; {Wa~}1`Kl  
 bfh.bfOffBits=54; psu OJ-  
 CFile bf; d<_NB]V&F  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Wge ho  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); hRRkFz/0&  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); O%prD}x  
  bf.WriteHuge(lpData,size); NA=#> f+U%  
  bf.Close(); x!`b'U\  
  nCount++; \w3%[+c  
 } d4% `e&K]'  
 GlobalFreePtr(lpData); ]79~:m[C  
 if(nCount==1) P6:;Y5e0  
  m_Number.Format("%d picture captured.",nCount); :b <KX%g  
 else % mJ~F*Dy  
  m_Number.Format("%d pictures captured.",nCount); -E}>h[;qZ  
  UpdateData(FALSE); au,jAk  
} }$<^wt  
v7L"`  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) rNZO.qij z  
{ T0YDfo  
 if(pMsg -> message == WM_KEYDOWN) ^DzL$BX  
 { 64h_1,U  
  if(pMsg -> wParam == VK_ESCAPE) ))p$vU3  
   return TRUE; -.^3;-[  
  if(pMsg -> wParam == VK_RETURN) ):^ '/e  
   return TRUE; ka!Bmv)  
 } -}E)M}W  
 return CDialog::PreTranslateMessage(pMsg); Ri; =aZ5m  
} l 4!kxXf-<  
[7'#~[a~  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @81-kdTx  
{ sRi?]9JIl  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ _O"L1Let  
  SaveBmp(); C1KfXC*|L  
  return FALSE; Q js2hj-$  
} Sf=F cb  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ E2kW=6VO>|  
 CMenu pop; ;*W=c   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); OI*ZVD)J  
 CMenu*pMenu=pop.GetSubMenu(0); DCt\E/  
 pMenu->SetDefaultItem(ID_EXITICON); | xp$OL"a  
 CPoint pt; Hw\([j*  
 GetCursorPos(&pt); *}>Bkq9h  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); *X~B-a|nJ  
 if(id==ID_EXITICON) PEfE'lGj  
  DeleteIcon(); F%9cS :  
 else if(id==ID_EXIT) s fyBw  
  OnCancel(); Mm "Wk  
 return FALSE; |3 ;u"&(P  
} ]/LWrQD  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); \{[D|_   
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) vc )9Re$  
 AddIcon(); Cca6L9%  
 return res; G4O,^ v;Q  
} C/CN '  
kxygf9I!;  
void CCaptureDlg::AddIcon() qx Wgt(Os  
{ IY V-*/ |  
 NOTIFYICONDATA data; JOJh,8C) 6  
 data.cbSize=sizeof(NOTIFYICONDATA); T_uNF8Bh  
 CString tip; {cmo^~[L$  
 tip.LoadString(IDS_ICONTIP); XIqv {w  
 data.hIcon=GetIcon(0); 1po"gVot  
 data.hWnd=GetSafeHwnd(); ]vRVo6@ k  
 strcpy(data.szTip,tip); -E6Jf$  
 data.uCallbackMessage=IDM_SHELL; sk~za  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; = vY]G5y  
 data.uID=98;   YfTd  
 Shell_NotifyIcon(NIM_ADD,&data); h0T< :X   
 ShowWindow(SW_HIDE); l?})_1v,R  
 bTray=TRUE; y=-{Q  
} 4\&H?:c.  
V/`#B$6  
void CCaptureDlg::DeleteIcon() {`+bW"9  
{ qnabwF  
 NOTIFYICONDATA data; 5tN%a>D%  
 data.cbSize=sizeof(NOTIFYICONDATA); C]yvK}  
 data.hWnd=GetSafeHwnd(); sVE>=0TVP  
 data.uID=98; L.SDMz  
 Shell_NotifyIcon(NIM_DELETE,&data); P=f<#l"v  
 ShowWindow(SW_SHOW); PZKbnu  
 SetForegroundWindow(); *d^9,GGn-  
 ShowWindow(SW_SHOWNORMAL); T^KCB\\<  
 bTray=FALSE; 2.^7?ok  
}  qJsQb  
.Q l;(Wyl  
void CCaptureDlg::OnChange() %T3j8fC{s  
{ hCU)W1q#  
 RegisterHotkey(); &W&7bZ$;  
} +`Q PBj^  
C HQ {+?#  
BOOL CCaptureDlg::RegisterHotkey() \7|s$ XQ\  
{ 7'-)/Pk  
 UpdateData(); Iu)L3_+  
 UCHAR mask=0; 9c"0~7v  
 UCHAR key=0; cFRSd }p=  
 if(m_bControl) on]\J  
  mask|=4;  ~Y1"k]J  
 if(m_bAlt) Hi9 G^Q  
  mask|=2; B$K7L'e+-  
 if(m_bShift) p5lR-G  
  mask|=1; ;e&hM\p  
  key=Key_Table[m_Key.GetCurSel()]; Q'FX:[@x-S  
 if(bRegistered){ DH}s1mNMP  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); uU8*$+ "  
  bRegistered=FALSE; I'KR'1z 9  
 } R=2 gtW"r  
 cMask=mask; #]?,gwvTf  
 cKey=key; o%kSR ]V|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); gg lNpzj  
 return bRegistered; ~J8cS  
} j zxf"X-  
5"76R Gw=  
  四、小结 ?3]h~( =  
NUi{!<  
  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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