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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, k6$`  
  ?e%ZOI  
  一、实现方法 v&6-a*<Z  
})'B<vq  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: -M\<nx  
A[B<~  
#pragma data_seg("shareddata") )~X2 &^orW  
HHOOK hHook =NULL; //钩子句柄 y#`tgJ:  
UINT nHookCount =0; //挂接的程序数目 ~]sc^[  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 `~cqAs}6]Q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 2_>N/Z4T  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey :@yEQ#nFp  
static int KeyCount =0; \UA[  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 )j6~Wy@4  
#pragma data_seg() t^&Cxh  
Lw1Yvtn  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 gM&{=WDG6  
[DuttFX^x  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: rm7ANMB:  
TP*hd  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR b 1c y$I  
cKey,UCHAR cMask) z'Hw  
{ ]U+ LJOb  
 BOOL bAdded=FALSE; /l3V3B7  
 for(int index=0;index<MAX_KEY;index++){ cTifC1Pf  
  if(hCallWnd[index]==0){ -E[Kml~U  
   hCallWnd[index]=hWnd; /'SNw?&  
   HotKey[index]=cKey; }PlRx6r@  
   HotKeyMask[index]=cMask; y RqL9t  
   bAdded=TRUE; PrqlTT}Px  
   KeyCount++; i$Ul(?  
   break; x>K Or,f  
  } G/E+L-N#`  
 } xo^b&ktQd  
 return bAdded;  $c!p&  
} AI2)g1m  
//删除热键 g&L!1<, p  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h4gXvPS&r  
{ ic:zsuEm  
 BOOL bRemoved=FALSE; '@v\{ l  
 for(int index=0;index<MAX_KEY;index++){ #~]zhHI  
  if(hCallWnd[index]==hWnd){ gT. sj d  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |"}FXa O  
    hCallWnd[index]=NULL; aqZi:icFa  
    HotKey[index]=0; yZY\MB/  
    HotKeyMask[index]=0; :U|1xgB  
    bRemoved=TRUE; )MVz$h{c.]  
    KeyCount--; dFxIF;C>/  
    break; (XTG8W sN  
   } K8|r&`X0  
  } FjHv   
 } 6_o*y8s.  
 return bRemoved; 3DX*gsx(  
} mthA4sz  
;+R&}[9,A)  
+HpA:]#Y  
  DLL中的钩子函数如下: ,Fl)^Gl8?  
KfEx"94  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 2QcOR4_V  
{ :`#d:.@]o@  
 BOOL bProcessed=FALSE; "]*&oQCI  
 if(HC_ACTION==nCode) rBzuKQK}J  
 { h+H%?:FX  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 DCO\c9  
   switch(wParam) M] %?>G  
   {  }-{H  Y  
    case VK_MENU: e2Pcm_Ahv*  
     MaskBits&=~ALTBIT; Wis~$"  
     break; hh%-(HaLX3  
    case VK_CONTROL: ub0.J#j@  
     MaskBits&=~CTRLBIT; jRlYU`?  
     break; `$IK`O  
    case VK_SHIFT: 2a)xTA#  
     MaskBits&=~SHIFTBIT; Mj3A5;#  
     break; gs[uD5oo<  
    default: //judge the key and send message & ywPuTt  
     break; RLXL&  
   } ;`4&Rm9n?  
   for(int index=0;index<MAX_KEY;index++){ M/'sl;  
    if(hCallWnd[index]==NULL) B]wk+8SMY.  
     continue; UhWNl]Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8'[7 )I=  
    { -0 a/$h  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8 >EWKI9  
     bProcessed=TRUE; M)+H{5bt  
    } >8^ $ [}w  
   } !Pvf;rNI1T  
  } {6|G@ ""O  
  else if((lParam&0xc000ffff)==1){ //有键按下 LmrfN?5  
   switch(wParam) P )"m0Lu<  
   { 2WL|wwA  
    case VK_MENU: VA>35w  
     MaskBits|=ALTBIT; (`>+zT5aH  
     break; xh,qNnGGi  
    case VK_CONTROL: 6vo;!V6  
     MaskBits|=CTRLBIT; /4V#C-  
     break; H5B:;g@  
    case VK_SHIFT: x"=f+Mr  
     MaskBits|=SHIFTBIT; Gr'  CtO  
     break; jXx<`I+]  
    default: //judge the key and send message @f~RdO3  
     break; -HbC!w v  
   } {hjhL: pg  
   for(int index=0;index<MAX_KEY;index++){ .t-4o<7 3  
    if(hCallWnd[index]==NULL) )p0^zv{  
     continue; ]i)c{y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'RR~7h  
    { -H@:*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Wx}8T[A}  
     bProcessed=TRUE; zpZm&WC  
    } Lc,Pom  
   } m+R[#GE8#  
  } ||= )d&  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 K~{$oD7!  
   for(int index=0;index<MAX_KEY;index++){ X6X $Pve  
    if(hCallWnd[index]==NULL) ,/%=sux  
     continue; Su7?;Oh/yI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) m|n%$$S&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); }Yzco52  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 nI-w}NQ  
   } Y|f[bw  
  } @7]yl&LZ  
 } y/cvQY0pU  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !4RWYMV "  
} - q1?? u  
8@Q$'TT6}  
  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: O)*+="Rg  
$?Hu#Kn,(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9G#n 0&wRJ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9igiZmM  
s}9S8@#  
  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-WT]&n_  
m@2QnA[ 4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) q4:o#K#  
{ @ $ ;q ;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6:[dj*KGmT  
 { ]I dk:et  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 -`kW&I0  
  SaveBmp(); ^e_hLX\SW  
  return FALSE; +T1pJ 89P  
 } qZtzO2Mt  
 …… //其它处理及默认处理 ]Kt6^|S$a  
} QvlObEhcS  
Bi3<7  
{OkV%Q<  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 %~H-)_d20  
yy^q2P  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Cazocq5  
!Y0Vid  
  二、编程步骤 9}!qR|l3nR  
#uG%j  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; XH4  
S]e|"n~@  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; A5I)^B<(  
O>b C2;+s  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ifMRryN4  
BDW^7[n  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ~F|+o}a `  
jUYWrYJ  
  5、 添加代码,编译运行程序。 [2!w_Iw'  
u^ +7hkk  
三、程序代码 bQg:zww  
r;.yz I  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL T= y}y  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) vAF "n  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ }I+E\ <  
#if _MSC_VER > 1000 Xv5wJlc!d  
#pragma once 17%,7P9pg  
#endif // _MSC_VER > 1000 ^B.5GK)!  
#ifndef __AFXWIN_H__ VX0 %a@ur  
#error include 'stdafx.h' before including this file for PCH Y1W1=Uc uk  
#endif {yTGAf-DV  
#include "resource.h" // main symbols q.^;!f1  
class CHookApp : public CWinApp ^+>laOzC`8  
{ Q2w_X8  
 public:  j|DsG,  
  CHookApp(); hP%M?MKC  
  // Overrides njB;&N)I  
  // ClassWizard generated virtual function overrides ?DS@e@lx  
  //{{AFX_VIRTUAL(CHookApp) .]Y$o^mf  
 public: ~OYiq}g  
  virtual BOOL InitInstance(); 6RU~"C  
  virtual int ExitInstance(); av8B-GQI*#  
  //}}AFX_VIRTUAL ~~/|dh5  
  //{{AFX_MSG(CHookApp) lV3x*4O=  
  // NOTE - the ClassWizard will add and remove member functions here. $t'MSlF  
  // DO NOT EDIT what you see in these blocks of generated code ! \g`\`e53?  
  //}}AFX_MSG \_VA 50  
  DECLARE_MESSAGE_MAP() !I{0 _b{  
}; _2Zx?<] 2E  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ~f&E7su-6+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); S:#lH?<_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }1L4 "}L.  
BOOL InitHotkey(); hlvK5Z   
BOOL UnInit(); x}wG:K  
#endif P-9)38`5  
wv>^0\o  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Gt8M&S-;  
#include "stdafx.h" kUL' 1!j7  
#include "hook.h" u"r`3P`  
#include <windowsx.h> _P#|IAq*  
#ifdef _DEBUG ]!W=^!  
#define new DEBUG_NEW "b~+;<}Q  
#undef THIS_FILE b"<liGh"n-  
static char THIS_FILE[] = __FILE__; k{R>  
#endif ,1.p%UE]>  
#define MAX_KEY 100 j1Y~_  
#define CTRLBIT 0x04 GLH0 ]  
#define ALTBIT 0x02 fh&nu"&  
#define SHIFTBIT 0x01 x xHY+(m  
#pragma data_seg("shareddata") nK1Slg#U  
HHOOK hHook =NULL; 1SQ3-WU s  
UINT nHookCount =0; y>8sZuH0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey IkL#SgY  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 7y'RFD9@{  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ch*8B(:  
static int KeyCount =0; t5^{D>S1  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift d~])K#oJ  
#pragma data_seg() nmee 'oEw  
HINSTANCE hins; \Gef \   
void VerifyWindow(); rm'SOJVA  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) h ]5(].  
//{{AFX_MSG_MAP(CHookApp) Ye%~I`@?  
// NOTE - the ClassWizard will add and remove mapping macros here. '&P%C" 5  
// DO NOT EDIT what you see in these blocks of generated code! >>4qJ%bL  
//}}AFX_MSG_MAP @W.S6;GA\  
END_MESSAGE_MAP() L8@f-Kk  
lf`{zc r:  
CHookApp::CHookApp() udK%>  
{ i'<[DjMDlm  
 // TODO: add construction code here, >%_\;svZG  
 // Place all significant initialization in InitInstance g\|PcoLm  
} ~f2z]JLr:  
"m):Y;9iQ?  
CHookApp theApp; Ve$o}h-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ,C\i^>=  
{ s2p\]|5  
 BOOL bProcessed=FALSE; 3GYw+%Z]  
 if(HC_ACTION==nCode) 1/B>XkCJ  
 { 5+4IN5o]=  
  if((lParam&0xc0000000)==0xc0000000){// Key up EmWn%eMN  
   switch(wParam) JJ-( Sl  
   { zy?|ODM  
    case VK_MENU: sPpH*,(  
     MaskBits&=~ALTBIT; e-/&$Qq  
     break; Lz}OwKl  
    case VK_CONTROL: n: ^ d|@  
     MaskBits&=~CTRLBIT; D(op)]8  
     break; x M/+L:_<  
    case VK_SHIFT: S&5&];Ag  
     MaskBits&=~SHIFTBIT; :1Xz4wkWS*  
     break; XAKs0*J>  
    default: //judge the key and send message {GT*ZU*  
     break; #6aW9GO  
   } UBU=9a5  
   for(int index=0;index<MAX_KEY;index++){ |)DGkOtd  
    if(hCallWnd[index]==NULL) / y40(l?  
     continue; S"QWB`W2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) oAVnK[EMq`  
    { PcMD])Z{G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;W )Y OT  
     bProcessed=TRUE; 1Faf$J~7|  
    } r EE1sy/#  
   } =!A_^;NQf  
  } j?\Qh  
  else if((lParam&0xc000ffff)==1){ //Key down Q~]uC2Mw  
   switch(wParam) :K,i\  
   { .k%72ez  
    case VK_MENU: dh iuI|?@  
     MaskBits|=ALTBIT; :gibfk]C  
     break; @+2=g WH  
    case VK_CONTROL: "Qc7dRmSxm  
     MaskBits|=CTRLBIT; yjX9oxhtL  
     break; B)g[3gQ  
    case VK_SHIFT: z (wc0I  
     MaskBits|=SHIFTBIT; ^98~U\ar  
     break; >Eto( y"q  
    default: //judge the key and send message f|c{5$N!  
     break; %3-y[f  
   } '3fu  
   for(int index=0;index<MAX_KEY;index++) N/2 T[s_&  
   { + .[ <%  
    if(hCallWnd[index]==NULL) nPl?K:(  
     continue; ^A/k)x6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $szqy?i 0?  
    { &)ChQZA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); n5NsmVW\x  
     bProcessed=TRUE; xGg )Y#  
    } 4N3R|  
   } nh>vixe  
  } 7(8;t o6(  
  if(!bProcessed){ ^"2J]&x`G  
   for(int index=0;index<MAX_KEY;index++){ 9~XA q^e  
    if(hCallWnd[index]==NULL) }2.`N%[  
     continue; *)T^Ch D,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) nRS}}6Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); & l&:`nsJ  
   } 1};Stai'  
  } ,T$U'&;  
 } d.d/<  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,/F~ Y&1I  
} IueFx u  
J @1!Oq>  
BOOL InitHotkey() )'#A$ Fj  
{ x*U)Y  
 if(hHook!=NULL){ ?mxMk6w  
  nHookCount++; 6iE<T&$3P  
  return TRUE; Fj3a.'  
 } zE9W8:7  
 else | rtD.,m   
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); dOH &  
  if(hHook!=NULL) ,f'CD{E  
   nHookCount++; )lqAD+9Q  
  return (hHook!=NULL); ag[wdoj  
} 9 -a0:bP  
BOOL UnInit() nT$SfGFj8  
{ ~-Qw.EdC  
 if(nHookCount>1){ s$`0yGmQ  
  nHookCount--; j-}O0~Jz  
  return TRUE; D.u{~  
 } uh  > ; 8  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $Sip$\+*  
 if(unhooked==TRUE){ }V`"s^  
  nHookCount=0;  SRDp*  
  hHook=NULL; S g![Lsj  
 } Jk n>S#SZ  
 return unhooked; \V~eVf;~  
} AH7}/Rc  
J<h $ wM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V&2l5v  
{ !M1"b;  
 BOOL bAdded=FALSE; o|<!"AD7  
 for(int index=0;index<MAX_KEY;index++){ !?h;wR  
  if(hCallWnd[index]==0){ Z=o2H Bm7  
   hCallWnd[index]=hWnd; z$. 88 ^  
   HotKey[index]=cKey; j6 z^Tt12  
   HotKeyMask[index]=cMask; /7F:T[  
   bAdded=TRUE; ndMA-`Ny,  
   KeyCount++; z46~@y%k  
   break; =-n}[Y}A  
  } Y.rsR 6  
 } WW~sNC\3`(  
 return bAdded; \Uq(Zga4)  
} [sj osV  
Iit; F  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {_p_%;  
{ hhc,uJ">!  
 BOOL bRemoved=FALSE; :*9Wh  
 for(int index=0;index<MAX_KEY;index++){ ]&+s6{}  
  if(hCallWnd[index]==hWnd){ +VOK%8,p  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >_T-u<E  
    hCallWnd[index]=NULL; c4eBt))}V  
    HotKey[index]=0; -gX1-,dE  
    HotKeyMask[index]=0; `Eo.v#<  
    bRemoved=TRUE; w+u3*/Zf  
    KeyCount--; Z,Dl` w  
    break; (gWm,fI RZ  
   } GH$pKB  
  } [5Mr@f4I  
 } Q sCheHP  
 return bRemoved; 4O!ikmY:t  
} z5*'{t)  
@Z:l62l=bE  
void VerifyWindow() Ne1$ee. NE  
{ PIS2Ed]  
 for(int i=0;i<MAX_KEY;i++){ F0Yd@Lk$_  
  if(hCallWnd!=NULL){ '3^'B0 3  
   if(!IsWindow(hCallWnd)){ |#R7wnE[k~  
    hCallWnd=NULL; $suzW;{#  
    HotKey=0; T%*D~=fQ'  
    HotKeyMask=0; )R1<N  
    KeyCount--; DT&@^$?  
   } >7DhTM-A  
  } kVLS  
 } N6i Q8P -  
} 5">Z'+8  
m#\ dSl}  
BOOL CHookApp::InitInstance() hf&9uHN%7m  
{ Em~>9f ?Q(  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~q25Yx9W@  
 hins=AfxGetInstanceHandle(); YNsJZnGr8#  
 InitHotkey(); mrtb*7`$  
 return CWinApp::InitInstance(); kc`Tdn  
} 8&b,qQ~  
tf`^v6m%]  
int CHookApp::ExitInstance() ^SrJu:Q_  
{ j*r{2f4Rt  
 VerifyWindow(); > /caXvS  
 UnInit(); i?^L/b`H  
 return CWinApp::ExitInstance(); R~ q]JSIC@  
} ] >E s4 s  
'E""amIJ  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file #!+:!_45  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Qh\60f>0  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~oY^;/ j  
#if _MSC_VER > 1000 Z4 =GMXj  
#pragma once II{&{S'HU  
#endif // _MSC_VER > 1000 p H2Sbs:Tk  
9CD_ os\h  
class CCaptureDlg : public CDialog t\7[f >  
{ ye5&)d"fa(  
 // Construction </*6wpN  
 public: I9ep`X6Y  
  BOOL bTray; o|["SYIf  
  BOOL bRegistered; FVJ GL  
  BOOL RegisterHotkey(); HLG"a3tt  
  UCHAR cKey; 8FY?!C  
  UCHAR cMask; vUM4S26"NT  
  void DeleteIcon(); &^Q/,H~S  
  void AddIcon(); Ta\tYZj$  
  UINT nCount; $*fMR,~t&  
  void SaveBmp(); [Z$[rOF  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor P-"y3 ZE=  
  // Dialog Data $-sHWYZ  
  //{{AFX_DATA(CCaptureDlg) F7#JLE=  
  enum { IDD = IDD_CAPTURE_DIALOG }; 5$C-9  
  CComboBox m_Key; 9'bwWBf7  
  BOOL m_bControl; A~70  
  BOOL m_bAlt; U # qK.  
  BOOL m_bShift; Ig>(m49d  
  CString m_Path; TarY|P7_  
  CString m_Number; (SAs-  
  //}}AFX_DATA Qzw;i8n{  
  // ClassWizard generated virtual function overrides $~T4hv :  
  //{{AFX_VIRTUAL(CCaptureDlg) P5 ywhw-  
 public: nAdf=D'P  
  virtual BOOL PreTranslateMessage(MSG* pMsg); qUb&   
 protected: g[4WzDF*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8KzkB;=n  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }k.Z~1y  
  //}}AFX_VIRTUAL Otn1wBI  
  // Implementation IW] rb/H  
 protected: a9V,es"BWQ  
  HICON m_hIcon; 6.yu-xm  
  // Generated message map functions om:VFs\U  
  //{{AFX_MSG(CCaptureDlg) AFwdJte9e  
  virtual BOOL OnInitDialog(); |+D!= :x  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); O?#7N[7  
  afx_msg void OnPaint(); FGq [ \B  
  afx_msg HCURSOR OnQueryDragIcon(); Ml-6OvQ7g  
  virtual void OnCancel(); DZtsy!xA  
  afx_msg void OnAbout(); {]4LULq  
  afx_msg void OnBrowse(); 67FWa   
  afx_msg void OnChange(); BnF^u5kv%  
 //}}AFX_MSG +9sQZB# (  
 DECLARE_MESSAGE_MAP() H3-hcx54T  
}; mj7#&r,1l  
#endif M kXmA`cP  
5wU]!bxr  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 1EX;MW-p<T  
#include "stdafx.h" ('+d.F[109  
#include "Capture.h" 'i|YlMFIg  
#include "CaptureDlg.h" ]u/sphPe  
#include <windowsx.h> 2&J)dtqz  
#pragma comment(lib,"hook.lib") W: z;|FF  
#ifdef _DEBUG Ar#(psU  
#define new DEBUG_NEW +^F Zq$NP  
#undef THIS_FILE !&@615Vtw  
static char THIS_FILE[] = __FILE__; N?`' /e  
#endif !^G\9"4A  
#define IDM_SHELL WM_USER+1 <<O$ G7c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); aw&,S"A@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~6md !o%i  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &_8 947  
class CAboutDlg : public CDialog -MBxl`JU  
{ 6j|{`Zd)G  
 public: =:U`k0rn!  
  CAboutDlg(); Bk{]g=DO  
  // Dialog Data #fM`}Ij.A  
  //{{AFX_DATA(CAboutDlg) pT6$DB#  
  enum { IDD = IDD_ABOUTBOX }; :\_ 5oVb  
  //}}AFX_DATA Zx>=tx}  
  // ClassWizard generated virtual function overrides Q22 GIr  
  //{{AFX_VIRTUAL(CAboutDlg) K wVbbC3  
 protected: P[fq8lDA  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support XQw9~$  
  //}}AFX_VIRTUAL 4s oJ.j8  
  // Implementation _DEjF)S  
 protected: bpa?C  
  //{{AFX_MSG(CAboutDlg) l9"s>PU  
  //}}AFX_MSG |;{6& S  
  DECLARE_MESSAGE_MAP() >+T)#.wo&  
}; 2MK-5 Kg  
{id4:^u&;  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |JsZJ9W+J  
{ ]hV*r@d  
 //{{AFX_DATA_INIT(CAboutDlg) )=(kBWM  
 //}}AFX_DATA_INIT l;E(I_ i)  
} | 6y  
AQ^u   
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;5AcFB  
{ y8xE 6i  
 CDialog::DoDataExchange(pDX); EKN~H$.  
 //{{AFX_DATA_MAP(CAboutDlg) -$g#I  
 //}}AFX_DATA_MAP ?gXp*>Kg[  
} pQQH)`J|t  
:rP=t ,  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) cidP|ie^  
 //{{AFX_MSG_MAP(CAboutDlg) ?\n > AC  
 // No message handlers zKK9r~ M  
 //}}AFX_MSG_MAP Wa~=bH  
END_MESSAGE_MAP() ^=*;X;7  
W} ofAkF  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) _tycgq#  
: CDialog(CCaptureDlg::IDD, pParent) -F3-{E  
{ dQG=G%W  
 //{{AFX_DATA_INIT(CCaptureDlg) -I%5$`z  
  m_bControl = FALSE; J9 I:Q<;  
  m_bAlt = FALSE; UGatWj  
  m_bShift = FALSE; c1gQ cqF  
  m_Path = _T("c:\\"); O33 `+UV"W  
  m_Number = _T("0 picture captured."); 2+WaA ,   
  nCount=0; Gp\ kU:}&  
  bRegistered=FALSE; IvNT6]6 P  
  bTray=FALSE; o;R I*I  
 //}}AFX_DATA_INIT VS|2|n1<6  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 $NO&YLS@  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;9'OOz|+1  
} ,iwp,=h=  
M'l ;:  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) #,v {Ihn  
{ 4`=m u}Y2  
 CDialog::DoDataExchange(pDX); I*^Ta{j[  
 //{{AFX_DATA_MAP(CCaptureDlg) U`s{Jm  
  DDX_Control(pDX, IDC_KEY, m_Key); xd0 L{ue.  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); XB5DPx  
  DDX_Check(pDX, IDC_ALT, m_bAlt); FE;x8(;W8  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); HtYwEjI  
  DDX_Text(pDX, IDC_PATH, m_Path); S`]k>' l  
  DDX_Text(pDX, IDC_NUMBER, m_Number); EB|}fz  
 //}}AFX_DATA_MAP -D~%|).'  
} yaV|AB$v  
Z5]>pJFq,  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) /_ajaz%  
//{{AFX_MSG_MAP(CCaptureDlg) 3T0"" !Q  
 ON_WM_SYSCOMMAND() BfiD9ka-z  
 ON_WM_PAINT() )BfAw  
 ON_WM_QUERYDRAGICON() J4U1t2@)9  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Qe(:|q _  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) m~ee/&T  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ygl0k \  
//}}AFX_MSG_MAP PeEj&4k  
END_MESSAGE_MAP() E&:,oG2M  
ZSm3XXk  
BOOL CCaptureDlg::OnInitDialog() {BU;$  
{ P0jtp7)7  
 CDialog::OnInitDialog(); Jj%K=sw  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); "tpSg  
 ASSERT(IDM_ABOUTBOX < 0xF000); Ny)X+2Ae  
 CMenu* pSysMenu = GetSystemMenu(FALSE); lqpp)Cq  
 if (pSysMenu != NULL) seeB S/%  
 { IMONgFBS  
  CString strAboutMenu; lU8Hd|@-  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ,5<Cd,`*  
  if (!strAboutMenu.IsEmpty()) iO; 7t@]-  
  { P=G3:eX  
   pSysMenu->AppendMenu(MF_SEPARATOR); Od)C&N=y  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); R@rBEW&  
  } @"H >niG  
 } R ViuJ;  
 SetIcon(m_hIcon, TRUE); // Set big icon >b4eL59  
 SetIcon(m_hIcon, FALSE); // Set small icon r" ,GC]  
 m_Key.SetCurSel(0); |$_sX9\`?|  
 RegisterHotkey(); D. XvG_  
 CMenu* pMenu=GetSystemMenu(FALSE); @Do= k  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); u\JNr}bL  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); K", N!koj  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5l*&>C[(i  
 return TRUE; // return TRUE unless you set the focus to a control k|d+#u[Mj@  
} Owk|@6!  
N ZSSg2TX#  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Mf``_=K  
{ _:27]K:  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Yg1  X  
 { Ma"]PoP  
  CAboutDlg dlgAbout; tIgN$BHR>  
  dlgAbout.DoModal(); 1|wL\I  
 } q5:N2Jmo?z  
 else 12LL48bi  
 { *;*r 8[U}q  
  CDialog::OnSysCommand(nID, lParam); a:6m7U)P#5  
 } 4{`{WI{  
} c!9nnTap  
yz8jw:d^-  
void CCaptureDlg::OnPaint() V~5jfcd  
{ [ibu/ W$  
 if (IsIconic()) | %Vh`HT  
 { @<&m|qtMsz  
  CPaintDC dc(this); // device context for painting g}',(tPMZ  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 9q[oa5INd  
  // Center icon in client rectangle CzEd8jeh7  
  int cxIcon = GetSystemMetrics(SM_CXICON); 04=c-~&q  
  int cyIcon = GetSystemMetrics(SM_CYICON); :6\qpex  
  CRect rect; ?(i{y~  
  GetClientRect(&rect); 3/n5#&c\4  
  int x = (rect.Width() - cxIcon + 1) / 2; ,\%c^,HLJ  
  int y = (rect.Height() - cyIcon + 1) / 2; )hfpwdQ  
  // Draw the icon A~t j/yq9  
  dc.DrawIcon(x, y, m_hIcon); Npy :!  
 } 65Yv4pNL  
 else ,nDaqQ-C!!  
 { #4 pB@_  
  CDialog::OnPaint(); ;;N9>M?b  
 } 6jLCU%^  
} !d0kV,F:  
V33T+P~j  
HCURSOR CCaptureDlg::OnQueryDragIcon() WEi2=3dV  
{ A2jUmK.&  
 return (HCURSOR) m_hIcon; iAIuxO  
} [K0(RDV)%  
v,>Dbxn  
void CCaptureDlg::OnCancel() IB] l1<  
{ @r/n F5  
 if(bTray) Fy-t T]Q9  
  DeleteIcon(); j HJ`,#  
  CDialog::OnCancel(); ?+}_1x`  
} UrEs4R1#  
J{fH ['tzO  
void CCaptureDlg::OnAbout() 6G""I]uT  
{ 4u})+2W  
 CAboutDlg dlg; _^%,x  
 dlg.DoModal(); %aVq+kC h  
} 68WO~*  
lp%pbx43s  
void CCaptureDlg::OnBrowse() IKilr'  
{ Vb]=B~^`  
 CString str; l?n\i]'  
 BROWSEINFO bi; > jc [nk  
 char name[MAX_PATH]; Q:d]imw!O  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 6fEqqUeV  
 bi.hwndOwner=GetSafeHwnd(); PP33i@G  
 bi.pszDisplayName=name; .;`AAH'k  
 bi.lpszTitle="Select folder"; -**g~ty)  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @>Km_Ax  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Iom'Y@x  
 if(idl==NULL) w-L=LWL\  
  return; N)\. [v  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); U$D65B4=  
 str.ReleaseBuffer(); ]:k/Y$O2  
 m_Path=str; eF-."1  
 if(str.GetAt(str.GetLength()-1)!='\\') @>2i+)=E5  
  m_Path+="\\"; 1JG'%8}#8  
 UpdateData(FALSE); C{xaENp  
} yZU6xY  
,G?WAOy,  
void CCaptureDlg::SaveBmp() #r~# I}U  
{ T;a}#56{^  
 CDC dc; A&Usddcp  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); .2Elr(&*h  
 CBitmap bm; 1FL~ndJs  
 int Width=GetSystemMetrics(SM_CXSCREEN); Ad9}9!<  
 int Height=GetSystemMetrics(SM_CYSCREEN); T<Z &kYU:R  
 bm.CreateCompatibleBitmap(&dc,Width,Height); W/bQd)Jvk  
 CDC tdc; U}rU~3N  
 tdc.CreateCompatibleDC(&dc); ,77d(bR<  
 CBitmap*pOld=tdc.SelectObject(&bm); RmeD$>7  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); '"/=f\)u  
 tdc.SelectObject(pOld); 6@F9G 4<Z  
 BITMAP btm; t: ;Pj9  
 bm.GetBitmap(&btm); NgGp  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Zbt.t] N  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); X Dm[Gc>(~  
 BITMAPINFOHEADER bih; J7Hl\Q[D1  
 bih.biBitCount=btm.bmBitsPixel; +RMSA^  
 bih.biClrImportant=0; jB Z&Ad@e  
 bih.biClrUsed=0; }9#r0Vja  
 bih.biCompression=0; _Gi4A  
 bih.biHeight=btm.bmHeight; H0gbSd+  
 bih.biPlanes=1; li'YDtMKCY  
 bih.biSize=sizeof(BITMAPINFOHEADER); ?*1uN=oI{*  
 bih.biSizeImage=size; iDz++VNV  
 bih.biWidth=btm.bmWidth; l<LP&  
 bih.biXPelsPerMeter=0; kY|utoAP  
 bih.biYPelsPerMeter=0; Y^;ovH~ ve  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); U} e!Wjrc  
 static int filecount=0; 0oZ= yh  
 CString name; p6]1w]*R  
 name.Format("pict%04d.bmp",filecount++); s_OF(o  
 name=m_Path+name; M l{Z  
 BITMAPFILEHEADER bfh; TA`1U;c{n  
 bfh.bfReserved1=bfh.bfReserved2=0; {JO  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ;!mzyb*  
 bfh.bfSize=54+size; ^Y>F|;M#  
 bfh.bfOffBits=54; "fCu=@i  
 CFile bf; +_?hK{Ib"  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ k"T}2 7  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Sw8]EH6  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); j_!F*yul  
  bf.WriteHuge(lpData,size); +>Qq(Y  
  bf.Close(); RXpw!  
  nCount++; ^& tZ  
 } D3Ig>gKo?m  
 GlobalFreePtr(lpData); Vod\a 5c  
 if(nCount==1) :0j?oY~e  
  m_Number.Format("%d picture captured.",nCount); uk< 4+x,2)  
 else F3v !AvA|  
  m_Number.Format("%d pictures captured.",nCount); 6S'yZQ |b  
  UpdateData(FALSE); I {S;L  
} h5{'Q$Erl  
<CYd+! (  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) VgG0VM  
{ av}k)ZT_  
 if(pMsg -> message == WM_KEYDOWN) ]YnD  
 { QuF:p  
  if(pMsg -> wParam == VK_ESCAPE) 6y%qVx#!  
   return TRUE; zUkgG61  
  if(pMsg -> wParam == VK_RETURN) "/*\1v9  
   return TRUE; JgKO|VO  
 } |"X*@s\'  
 return CDialog::PreTranslateMessage(pMsg); c?f4Q,%|  
} ';w#w<yaI  
$Uq|w[LA  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 67JA=,EE  
{ Yh@JXJ>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ zH?!  
  SaveBmp(); LvH 4{B  
  return FALSE; ?mwt~_s9  
} DbBcQ%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ _UMg[Um  
 CMenu pop; x*/t yZg6  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); UAkT*'cB  
 CMenu*pMenu=pop.GetSubMenu(0); EA@ .,7F  
 pMenu->SetDefaultItem(ID_EXITICON); ="1Ind@w!  
 CPoint pt; zsEc(  
 GetCursorPos(&pt); tzWSA-Li  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); )#0O>F~  
 if(id==ID_EXITICON) aD<A.Lhy  
  DeleteIcon(); )Ys x}vSZ  
 else if(id==ID_EXIT) VZp5)-!\  
  OnCancel(); ,uSMQS-O'4  
 return FALSE; [N-Di"  
} YFLZ%(  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); G, }Yl  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 7X`g,b!  
 AddIcon(); IA fc T!{  
 return res; FZ{h?#2?  
} 4qb/da E:Z  
!hA-_  
void CCaptureDlg::AddIcon() bQzZy5,  
{ !j8FIY'[  
 NOTIFYICONDATA data; EKYY6S2  
 data.cbSize=sizeof(NOTIFYICONDATA); afCW(zH p  
 CString tip; %8RrRW  
 tip.LoadString(IDS_ICONTIP); JinUV6cr  
 data.hIcon=GetIcon(0); bbDZ#DK"  
 data.hWnd=GetSafeHwnd(); A6  
 strcpy(data.szTip,tip); paA(C|%{  
 data.uCallbackMessage=IDM_SHELL; KaLzg5is  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Hc;[Cs0  
 data.uID=98; w49t9~  
 Shell_NotifyIcon(NIM_ADD,&data); @f_Lp%K  
 ShowWindow(SW_HIDE); [7:,?$tC  
 bTray=TRUE; o@_q]/Mh  
} i7CX65&b  
7zl5yK N  
void CCaptureDlg::DeleteIcon() 0gu_yg!R  
{ G~]Uk*M q  
 NOTIFYICONDATA data; `_6C {<O  
 data.cbSize=sizeof(NOTIFYICONDATA); =bAx,,D#  
 data.hWnd=GetSafeHwnd(); (=FRmdeYl1  
 data.uID=98; dUD[e,?  
 Shell_NotifyIcon(NIM_DELETE,&data); ?=u\n;w)  
 ShowWindow(SW_SHOW); :^<3>zk  
 SetForegroundWindow(); ,=uD^n:  
 ShowWindow(SW_SHOWNORMAL); _kC-dEGf!y  
 bTray=FALSE; K,tQ!kk  
} a)!o @  
`C,n0'PL.  
void CCaptureDlg::OnChange() lPe&h]@ >  
{ \Zb;'eDv  
 RegisterHotkey(); '"52uZ{  
} NYhB'C2  
9v#CE!  
BOOL CCaptureDlg::RegisterHotkey() ~EW(Gs!=C  
{ \wmN  
 UpdateData(); .S EdY:  
 UCHAR mask=0; I !- U'{  
 UCHAR key=0; o]odxr  
 if(m_bControl) 9FF0%*tGo  
  mask|=4; @s*-%N^:[L  
 if(m_bAlt) &Hrj3E  
  mask|=2; _OYasJUMG  
 if(m_bShift) \-E^lIVF  
  mask|=1; ;2G*wR  
  key=Key_Table[m_Key.GetCurSel()]; k``_EiV4t  
 if(bRegistered){ )Dm s  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); )',R[|<  
  bRegistered=FALSE; 9p85Pv [M=  
 } P|`8}|}a  
 cMask=mask; K&u_R  
 cKey=key; C-xr"]#]  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); vN}#Kc\  
 return bRegistered; n>z9K')  
} eNh39er  
:x3QRF  
  四、小结 F k7?xc  
39c2pV[  
  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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