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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: @+_pj.D  
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  一、实现方法 =*.S<Ko)  
_{ 2`sL)  
  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: "r8N- h/P  
1vAJ(O{-  
#pragma data_seg("shareddata") \ [M4[Qlq  
HHOOK hHook =NULL; //钩子句柄 ,,1y0s0`  
UINT nHookCount =0; //挂接的程序数目 D(&Zq7]n  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 X{[$4\di{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 il"pKQF  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ]zj&U#{  
static int KeyCount =0; ![eY%2;<  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 l)~$/#k  
#pragma data_seg() #Uep|A  
XWX]/j2jA  
  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。 ?%lfbZ  
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  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: LF)wn -C}  
] yWywa\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR biForT_no  
cKey,UCHAR cMask) z5D*UOy5M  
{ b_u; `^  
 BOOL bAdded=FALSE; -s7!:MB%g  
 for(int index=0;index<MAX_KEY;index++){ P)hGe3  
  if(hCallWnd[index]==0){ `Tk~?aY  
   hCallWnd[index]=hWnd; d DAl n+  
   HotKey[index]=cKey; )>iPx.hVSS  
   HotKeyMask[index]=cMask; 'geN  dx  
   bAdded=TRUE; -a"b:Q  
   KeyCount++; <xrya _R?  
   break; 9+8N-LZ  
  } sXT8jLIf  
 } glkH??S  
 return bAdded; 'F:Tv[qx  
} T[g(S0dz  
//删除热键 ytV[x  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) W'Y(@  
{ <K>qK]|C  
 BOOL bRemoved=FALSE; )jjaY1E  
 for(int index=0;index<MAX_KEY;index++){ [A] +Azc  
  if(hCallWnd[index]==hWnd){ v-"nyy-&Z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 5yj6MaqJ  
    hCallWnd[index]=NULL; nQg_1+  
    HotKey[index]=0; Q )8I(*  
    HotKeyMask[index]=0; 9Sa6v?sRor  
    bRemoved=TRUE; SP>&+5AydX  
    KeyCount--; C}pQFL{B5  
    break; pwB>$7(_h  
   } "5EL+z3v  
  } ZXIz.GFy+  
 } /#q6.du  
 return bRemoved; afu!.}4Ct  
} Mp[2Auf  
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  DLL中的钩子函数如下: >McEuoZx9  
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LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /*GCuc|  
{ L!`PM.:9  
 BOOL bProcessed=FALSE; SO<9?uk.  
 if(HC_ACTION==nCode) e+<9Sh7&  
 { {M\n  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 PR,8c  
   switch(wParam) `lt[Q>Z  
   {  1S yG  
    case VK_MENU: /bo`@ !-#  
     MaskBits&=~ALTBIT; JBLh4c3  
     break; H6/gRv@  
    case VK_CONTROL: +%K~HYN  
     MaskBits&=~CTRLBIT;  [ A 7{}  
     break; K}'?#a(aX=  
    case VK_SHIFT: LyL(~Jc|  
     MaskBits&=~SHIFTBIT; fX>y^s?y  
     break; %7?Z|'\  
    default: //judge the key and send message -MFePpUt  
     break; _sY; dS/  
   } QUh`kt(E  
   for(int index=0;index<MAX_KEY;index++){ 1jaK N*  
    if(hCallWnd[index]==NULL) Ynp#3 r  
     continue; v I,T1%llu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tZu1jBO_Q4  
    {  s=556  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); e0<O6  
     bProcessed=TRUE; uf"(b"N0  
    } *M$'dLn  
   } O{Z${TC[  
  } \^jRMIM==  
  else if((lParam&0xc000ffff)==1){ //有键按下 jdx T662q  
   switch(wParam) b/ h#{'  
   { Lu5X~6j"$  
    case VK_MENU: ntW1 )H'o  
     MaskBits|=ALTBIT; & x_ #zN]  
     break; Ds#BfP7a  
    case VK_CONTROL: (%"9LYv  
     MaskBits|=CTRLBIT; ;V?d;O4u  
     break; Mz\l C)\B  
    case VK_SHIFT: h Vui.]  
     MaskBits|=SHIFTBIT; ]b:>7_la  
     break; BfD&e`KI  
    default: //judge the key and send message xErb11  
     break; syI|gANT/r  
   } 8 VhU)fY  
   for(int index=0;index<MAX_KEY;index++){ 1I)oT-~  
    if(hCallWnd[index]==NULL) X; 6=WqJj  
     continue; O~Bh(_R&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0?dr(   
    { U.JE \/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -:OJX#j  
     bProcessed=TRUE; 7R# }AQ   
    } U]@?[+I0]  
   } PC|ul{[*}  
  } oYt 34@{?  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 t[@>u'YKt  
   for(int index=0;index<MAX_KEY;index++){ DuIXv7"[  
    if(hCallWnd[index]==NULL) ZY@ntV?  
     continue; > >KCd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }}D32T VN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); }W&9}9p"  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 DUh\x>^  
   } E+#<WK-  
  } D /GE-lq  
 } T[#q0bv  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  1X&jlD?  
} s~9n13z  
Vzo< ma^  
  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: 5t"FNL <(M  
~QDM .5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ak8Y?#"wz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Z# bO}!  
C/'w  
  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: [[zN Aq)"  
%:zu68Q[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =:]v~Ehq  
{ Dad$_%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) m}\QGtJ6  
 { t(9q 6x3|e  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 u3GBAjPsIk  
  SaveBmp(); "WUS?Q  
  return FALSE; 2E[7RBFY+\  
 } /of K7/  
 …… //其它处理及默认处理 : -d_  
} e,MsF4'  
XWyP'\  
]z/R?SM  
  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。 Z0m`%(MJa  
Zd-6_,r  
  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。 X<P <-e9  
Xq&BL,lS  
  二、编程步骤 5<R m{  
V?1 $H  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ]L7A$sTUQ  
va'F '|  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; -4& i t:  
mpMAhm:  
  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; bAGKi.  
MA6 Vy  
  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; Cl]?qH*:  
mV$ebFco0  
  5、 添加代码,编译运行程序。 ABX%oZ7[|o  
xI{4<m/0N  
三、程序代码 |uqI}6h.  
hEQyaDD;  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL L2ydyXIsd  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 0)332}Oh  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ D3X4@sM  
#if _MSC_VER > 1000 89g a+#7  
#pragma once h @!p:]  
#endif // _MSC_VER > 1000 '\tI|  
#ifndef __AFXWIN_H__ uK2HtRY1  
#error include 'stdafx.h' before including this file for PCH d?2ORr|m=  
#endif :_~.Nt  
#include "resource.h" // main symbols L(VFzPkY%  
class CHookApp : public CWinApp f +{=##'0  
{ <m]0!ii  
 public: ~v.mbh  
  CHookApp(); 10Ik_L='  
  // Overrides X8$Mzeq  
  // ClassWizard generated virtual function overrides w`)5(~b  
  //{{AFX_VIRTUAL(CHookApp) A'DFY {  
 public: P1Hab2%+  
  virtual BOOL InitInstance(); +[!S[KE  
  virtual int ExitInstance(); WiS3W;  
  //}}AFX_VIRTUAL dFy$w=  
  //{{AFX_MSG(CHookApp) p%I'd^}.!  
  // NOTE - the ClassWizard will add and remove member functions here. ^v'kEsE^*  
  // DO NOT EDIT what you see in these blocks of generated code ! -e/}DGL  
  //}}AFX_MSG b>; ?{  
  DECLARE_MESSAGE_MAP() mgAjD.  
}; :> 0ywg  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); V]F D'XAl  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "?NDN4l*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {dpC;jsW1  
BOOL InitHotkey(); dLiiJ6pl*  
BOOL UnInit(); R^l0Bu]X  
#endif (,U|H`  
IzpE|8l  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ba|xf@=&  
#include "stdafx.h" Z<nNk.G  
#include "hook.h" ^k=<+*9  
#include <windowsx.h> MzIDeZ  
#ifdef _DEBUG L 4j#0I]lq  
#define new DEBUG_NEW ?+t;\  
#undef THIS_FILE $hhXsu=  
static char THIS_FILE[] = __FILE__; 72dRp!J U  
#endif qUJ"* )S  
#define MAX_KEY 100 }dkXRce*  
#define CTRLBIT 0x04 zm&[K53  
#define ALTBIT 0x02 w2 Y%yjCV  
#define SHIFTBIT 0x01 s2O()u-  
#pragma data_seg("shareddata") t1w5U+z  
HHOOK hHook =NULL; =X R~I  
UINT nHookCount =0; 9O;Sn+  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 6$urrSQ`N0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT gi!_Nz  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ZNBowZI  
static int KeyCount =0; jIs>>  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Cbff:IP  
#pragma data_seg() Jt8;ddz  
HINSTANCE hins; hEZvi   
void VerifyWindow(); vbid>$%  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) V4,Gt ]4  
//{{AFX_MSG_MAP(CHookApp) a|t~&\@  
// NOTE - the ClassWizard will add and remove mapping macros here. XDPR$u8hM  
// DO NOT EDIT what you see in these blocks of generated code! &>jz[3  
//}}AFX_MSG_MAP t% qep|  
END_MESSAGE_MAP() w/#7G\U  
r2RJb6  
CHookApp::CHookApp() NY.Cr.}  
{ T?1BcY  
 // TODO: add construction code here, =Y2 Rht  
 // Place all significant initialization in InitInstance z*},N$2=  
} u "0{) ,  
OJe!K:  
CHookApp theApp; [%K6-\S  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8eB,$;i  
{ W8& )UtWQ  
 BOOL bProcessed=FALSE; |=q~X}DA  
 if(HC_ACTION==nCode) m,HE4`g  
 { !<];N0nt#  
  if((lParam&0xc0000000)==0xc0000000){// Key up 9nAP%MA`  
   switch(wParam) (HRj0,/^  
   { [<XYU,{R  
    case VK_MENU: chICc</l&  
     MaskBits&=~ALTBIT; $@Vn+| Ix  
     break; 'Ix@<$~i3F  
    case VK_CONTROL: j@4MV^F2c  
     MaskBits&=~CTRLBIT; cW*v))@2  
     break; F(VVb(\jd  
    case VK_SHIFT: 0Md>-H;ZY  
     MaskBits&=~SHIFTBIT; GQ1/pys  
     break; $#rkvG_w  
    default: //judge the key and send message PMsb"=Ds  
     break; yEWm.;&3=  
   } l,o'J%<%  
   for(int index=0;index<MAX_KEY;index++){ }ktIG|GC  
    if(hCallWnd[index]==NULL) 2Hd\>{*  
     continue; sywuS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HGYTh"R  
    { ~ky;[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6 /<Hx@r (  
     bProcessed=TRUE; k^cZePqE6d  
    } !H\;X`W|~D  
   } cAN!5?D\  
  } Z]B v  
  else if((lParam&0xc000ffff)==1){ //Key down bll[E}E|3  
   switch(wParam) Fv]6 a n.  
   { NFTv4$5d  
    case VK_MENU: L(|K{vHh]  
     MaskBits|=ALTBIT; E3 % ~!ZC  
     break; e%e.|+  
    case VK_CONTROL: G_1r&[N3  
     MaskBits|=CTRLBIT; )B]s.w  
     break; g(pr.Dw6  
    case VK_SHIFT: _&]7  
     MaskBits|=SHIFTBIT; 8gavcsVE[  
     break; z%E(o%l8  
    default: //judge the key and send message XncX2E4E  
     break; }W^@mi  
   } B& @ pZYl  
   for(int index=0;index<MAX_KEY;index++) f+9eB  
   { 6?u`u t  
    if(hCallWnd[index]==NULL) +(= -95qZ  
     continue; 85!]N F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3: GwX4yW  
    { ^ ##j {h7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); I\TSVJk^Xi  
     bProcessed=TRUE; cD]H~D}M  
    } 'dWUE-  
   } F^/KD<cgK  
  } +\ftSm>  
  if(!bProcessed){ c1E{J <pZ  
   for(int index=0;index<MAX_KEY;index++){ d:hnb)I$*  
    if(hCallWnd[index]==NULL) sg=G<50i  
     continue; dDA8IW![S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) I=dn]}b#P  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); VWzQXo  
   } '4M{Xn}@  
  } cO]w*Hti  
 } lD0a<L 3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); k.b=EX|  
} Xps \+l%i  
MhA4C 8  
BOOL InitHotkey() T;3qE1c  
{ ~D@YLW1z(  
 if(hHook!=NULL){ a>l,H#w*vW  
  nHookCount++; C)c*s C5N  
  return TRUE; J-/w{T8:  
 } bM"?^\a&Q  
 else [R1|=kGU  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); p@O Ip  
  if(hHook!=NULL) Ce-= -  
   nHookCount++; >yKz8SV#  
  return (hHook!=NULL); SrH::-{  
} 6O,k! y>  
BOOL UnInit() ;`^_9 K  
{ hBRi5&%  
 if(nHookCount>1){ /&|p7  
  nHookCount--; {St-  
  return TRUE; |pS]zD  
 } %\-E R !b  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ;o'r@4^&$R  
 if(unhooked==TRUE){ 2]?=\_T  
  nHookCount=0; 4Cu\|"5)  
  hHook=NULL; pTGGJ,  
 } V-7l+C5  
 return unhooked; oh:9v+  
} &xB*Shp,B  
)V~=B]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) CR23$<FC  
{ f8[O]MrO;  
 BOOL bAdded=FALSE; WPsfl8@D  
 for(int index=0;index<MAX_KEY;index++){ n= 4  
  if(hCallWnd[index]==0){ sQA_6]`  
   hCallWnd[index]=hWnd; , @UOj=  
   HotKey[index]=cKey; @*<0:Q|m  
   HotKeyMask[index]=cMask; Q<u?BA/  
   bAdded=TRUE; Y!oLNGY  
   KeyCount++; ?e6>dNw  
   break; O!nS3%De  
  } !@ ]IJ"\  
 } b4dviYI  
 return bAdded; XX /s@C  
} ]w>o=<?b  
~Z/,o)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) O=+$X Pa|  
{ ? -:2f#bC  
 BOOL bRemoved=FALSE; OS; T;  
 for(int index=0;index<MAX_KEY;index++){ JqMF9|{H  
  if(hCallWnd[index]==hWnd){ -_Z4)"k  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |?VJf3 A  
    hCallWnd[index]=NULL; 5z 0VMt  
    HotKey[index]=0; =MQ/z#:-P  
    HotKeyMask[index]=0; w -o#=R_  
    bRemoved=TRUE; l90"1I A  
    KeyCount--; v =y 2  
    break; {rR(K"M  
   } $4xSI"+M%  
  } jG7PT66>;  
 } 3<W%z]k@M  
 return bRemoved; MBg[hu%  
} 24#qg '  
+`GtZnt#  
void VerifyWindow() ?Q-Tyf$3  
{ mF\!~ag|  
 for(int i=0;i<MAX_KEY;i++){ p}JOiiHa  
  if(hCallWnd!=NULL){ ` 'Qb?F6  
   if(!IsWindow(hCallWnd)){ Oh$:qu7o0&  
    hCallWnd=NULL; K{ar)_V/  
    HotKey=0; i WD|F-  
    HotKeyMask=0; GA gTy  
    KeyCount--; }?9&xVh?\  
   } T3P9  
  } q_.fVn:!  
 } RN(I}]]a  
} `RnWh9  
4c< s"2F  
BOOL CHookApp::InitInstance() 7v%c.  
{ x>[]Qk^?q  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); !} TsFa  
 hins=AfxGetInstanceHandle(); 4=tR_s  
 InitHotkey(); mcez3gH  
 return CWinApp::InitInstance(); 12n:)yQy  
} DRQx5fgL  
~'_cBJ 'XD  
int CHookApp::ExitInstance() GjhTF|  
{ e NIzI]~  
 VerifyWindow(); )J S6W  
 UnInit(); 0y9 b0G  
 return CWinApp::ExitInstance(); lDYgt UKG  
} >u$8Z  
ZUQ _u  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file f,HUr% @  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) *V6| FU  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ u;_~{VJ-  
#if _MSC_VER > 1000 O]u'7nO{{  
#pragma once _B^zm-}8|B  
#endif // _MSC_VER > 1000 [%.v;+L  
OT{"C"%5t  
class CCaptureDlg : public CDialog D!&(#Vl _  
{ Py)ZHML  
 // Construction A0DGDr PD  
 public: 5BhR4+1J  
  BOOL bTray; (9'^T.J  
  BOOL bRegistered; sAkr-x?+M  
  BOOL RegisterHotkey(); j!u)V1,  
  UCHAR cKey; &N7ji  
  UCHAR cMask; USBQEt  
  void DeleteIcon(); 11=$] K>  
  void AddIcon(); bHwEd%f  
  UINT nCount; g":[rXvId  
  void SaveBmp(); ?%s>a8w  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor \fA{sehdL  
  // Dialog Data 9@ tp#  
  //{{AFX_DATA(CCaptureDlg) Y9+_MxC"  
  enum { IDD = IDD_CAPTURE_DIALOG }; '.mepxf< f  
  CComboBox m_Key; YT\@fgBt  
  BOOL m_bControl; bNea5u##  
  BOOL m_bAlt; Ww7Ya]b.k  
  BOOL m_bShift; ,EB}IG ]  
  CString m_Path; &|hK79D  
  CString m_Number; O`5,L[i1y  
  //}}AFX_DATA *G19fJ[5  
  // ClassWizard generated virtual function overrides $]2)r[eA)  
  //{{AFX_VIRTUAL(CCaptureDlg) 6Z2,:j;  
 public: Wq1>Bj$J8  
  virtual BOOL PreTranslateMessage(MSG* pMsg); P49\A^5S!  
 protected: yayhL DL  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support D|;O9iks#  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); @R[{  
  //}}AFX_VIRTUAL OviS(}v4@  
  // Implementation /(N/DMl[  
 protected: t^rw@$"}  
  HICON m_hIcon; Jz@~$L  
  // Generated message map functions lPTx] =G  
  //{{AFX_MSG(CCaptureDlg) }Z!D?(  
  virtual BOOL OnInitDialog(); Fhoyji4  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %Sr+D{B  
  afx_msg void OnPaint(); ,?fJ0n:!%  
  afx_msg HCURSOR OnQueryDragIcon(); YDt+1Kw}D  
  virtual void OnCancel(); jwZ,_CK  
  afx_msg void OnAbout(); LFp "Waiv  
  afx_msg void OnBrowse();  T{YZ`[  
  afx_msg void OnChange(); kxn&f(5  
 //}}AFX_MSG w:~*wv  
 DECLARE_MESSAGE_MAP() x]~TGzS  
}; %,$n^{v  
#endif zw0w."V  
{z#2gc'Q  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ZCiCZ)oc  
#include "stdafx.h" kB\{1;  
#include "Capture.h" qQ&uU7,#  
#include "CaptureDlg.h"  N;7/C  
#include <windowsx.h> qUe _B  
#pragma comment(lib,"hook.lib") @f!X%)\;x  
#ifdef _DEBUG gq?:n.;TY  
#define new DEBUG_NEW d0 cL9&~qW  
#undef THIS_FILE }aCa2%  
static char THIS_FILE[] = __FILE__; x0*{oP  
#endif 6 SSDc/  
#define IDM_SHELL WM_USER+1 AOf4y&B>q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); nB[-KS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *{o7G  a  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Z:; }  
class CAboutDlg : public CDialog R%E7 |NAG  
{ taQE r 2Zy  
 public: 0c_xPBbB+  
  CAboutDlg(); eRauyL"Q+  
  // Dialog Data {|;a?] ?  
  //{{AFX_DATA(CAboutDlg) Z6jEj9?O  
  enum { IDD = IDD_ABOUTBOX }; Dn- gP  
  //}}AFX_DATA 6Rd4waj_,U  
  // ClassWizard generated virtual function overrides azcPeAe  
  //{{AFX_VIRTUAL(CAboutDlg) z\YIwrq3*  
 protected:  ao(T81  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support V5|ANt  
  //}}AFX_VIRTUAL a"8[,A3  
  // Implementation #cbgp;,M{I  
 protected: (!j#u)O  
  //{{AFX_MSG(CAboutDlg) )P$(]{  
  //}}AFX_MSG !>UlvT-  
  DECLARE_MESSAGE_MAP() 4<s.|W`  
}; g(7 -3q8eq  
yPyu)  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Bd>~F7VWs  
{ |<%!9Z  
 //{{AFX_DATA_INIT(CAboutDlg) {]vD@)k  
 //}}AFX_DATA_INIT qnm_#!&uHT  
} h}b:-a  
Zg;$vIhn  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) pwUXM?$R  
{ I[Ra0Q>([k  
 CDialog::DoDataExchange(pDX); }xZi Ct  
 //{{AFX_DATA_MAP(CAboutDlg) $ /VQsb  
 //}}AFX_DATA_MAP UA[`{rf  
} J3 $>~?^1  
7y=>Wa?T[  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)  Et>#&Nw8  
 //{{AFX_MSG_MAP(CAboutDlg) "TRS(d|3  
 // No message handlers  0^;2  
 //}}AFX_MSG_MAP *4,Q9K_  
END_MESSAGE_MAP() .RQra+up  
6r7>nU&d  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) $-4](br|  
: CDialog(CCaptureDlg::IDD, pParent) "W<Y1$Y=Y  
{ 9>}&dQ8  
 //{{AFX_DATA_INIT(CCaptureDlg) b F=MQ  
  m_bControl = FALSE; ] 5Cr$%H=  
  m_bAlt = FALSE; \j8vf0c5b  
  m_bShift = FALSE;  56.!L  
  m_Path = _T("c:\\"); m_NX[>&Y3  
  m_Number = _T("0 picture captured."); T^bA O-d#  
  nCount=0; ~o}:!y  
  bRegistered=FALSE; \ovs[&  
  bTray=FALSE; g?j)p y  
 //}}AFX_DATA_INIT *X5)9dq  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 kUT2/3Vi  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); M!&Hn,22  
} 43=v2P0=Tj  
Mw[3711v  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX)  *7m lH  
{ &AiAd6  
 CDialog::DoDataExchange(pDX); ">V&{a-C4  
 //{{AFX_DATA_MAP(CCaptureDlg) U)}]Z@I-  
  DDX_Control(pDX, IDC_KEY, m_Key); ~id6^#&>  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Z0gtliJ@  
  DDX_Check(pDX, IDC_ALT, m_bAlt); A U~DbU0O  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); OVK )]- ~  
  DDX_Text(pDX, IDC_PATH, m_Path); ~Xi@#s~  
  DDX_Text(pDX, IDC_NUMBER, m_Number); :e<jD_.X  
 //}}AFX_DATA_MAP KsDS!O  
} _!xrBdaJ  
!gh8 Qs  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) v^"\e&XL  
//{{AFX_MSG_MAP(CCaptureDlg) B,b8\\^k|  
 ON_WM_SYSCOMMAND() J)nK9  
 ON_WM_PAINT() @K;b7@4y  
 ON_WM_QUERYDRAGICON() xoZ m,Pxd  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) qxZIH  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >Kgw2,y+  
 ON_BN_CLICKED(ID_CHANGE, OnChange) G e;67  
//}}AFX_MSG_MAP GDu^P+^  
END_MESSAGE_MAP() NuZ2,<~9  
}[+uHR6L  
BOOL CCaptureDlg::OnInitDialog() OGZD$j  
{ Xv1vq -cM  
 CDialog::OnInitDialog(); WJ{Iv] }9  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); pcMzLMG<  
 ASSERT(IDM_ABOUTBOX < 0xF000); j~v`q5X  
 CMenu* pSysMenu = GetSystemMenu(FALSE); @3`5(xwzm  
 if (pSysMenu != NULL) XkI'm\W  
 { ^'3c%&Zf3  
  CString strAboutMenu; c5]Xqq,  
  strAboutMenu.LoadString(IDS_ABOUTBOX); <':h/ d  
  if (!strAboutMenu.IsEmpty()) <rC%$tr  
  { G,C`+1$*  
   pSysMenu->AppendMenu(MF_SEPARATOR); /HIyQW\Ki-  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !h? HfpYv  
  } !y_FbJ8KC  
 } qbyYNlXqm  
 SetIcon(m_hIcon, TRUE); // Set big icon p)biOG  
 SetIcon(m_hIcon, FALSE); // Set small icon r1!1u7dr t  
 m_Key.SetCurSel(0); h<9vm[.  
 RegisterHotkey(); wFMH\a  
 CMenu* pMenu=GetSystemMenu(FALSE); }rQQe:{]B  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Q4XlYgIV2A  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ^4=#, K  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 7@@g|l]  
 return TRUE; // return TRUE unless you set the focus to a control aM5]cc%  
} fcq8aW/z_  
bi8_5I[  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) FJn-cR.n  
{ Pmv@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) U["0B8  
 { U7WYS8  
  CAboutDlg dlgAbout; xPZ>vCg  
  dlgAbout.DoModal(); |_?e.}K  
 } L:HvrB~  
 else dWz?`B{'  
 { : UeK0  
  CDialog::OnSysCommand(nID, lParam); ^ ]9K>}  
 } :M(uP e=D  
} MpOU>\  
L{1sYR%s\  
void CCaptureDlg::OnPaint() "Z&.m..gc  
{ biHacm  
 if (IsIconic()) }Xj25` x  
 { 1.14tS-}[4  
  CPaintDC dc(this); // device context for painting }AS?q?4?  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); "3^tVX%$\[  
  // Center icon in client rectangle vRe{B7}p;  
  int cxIcon = GetSystemMetrics(SM_CXICON); lpG%rN!  
  int cyIcon = GetSystemMetrics(SM_CYICON); mB-,\{)  
  CRect rect; ZV gfrvZP  
  GetClientRect(&rect); *}\M!u{J  
  int x = (rect.Width() - cxIcon + 1) / 2; * zp tbZ  
  int y = (rect.Height() - cyIcon + 1) / 2; F*P0=DD  
  // Draw the icon JmCMFq B9  
  dc.DrawIcon(x, y, m_hIcon); uzdPA'u  
 } 2 GRI<M  
 else nJe}U#  
 { 6qT@M0)i  
  CDialog::OnPaint(); ?4':~;~  
 } )R7Sh51P  
} 'dwW~4|B  
2j+w5KvU  
HCURSOR CCaptureDlg::OnQueryDragIcon() 9[/0  
{ 6 \8d6x>  
 return (HCURSOR) m_hIcon; +Kk1[fh-  
} ;MN$.x+  
yX!u&  
void CCaptureDlg::OnCancel() brA#p>4]Wf  
{ kG D_w  
 if(bTray) ~ YH?wdT  
  DeleteIcon(); ?W'z5'|  
  CDialog::OnCancel(); F;Q,cg M  
} }StzhV{GS  
/1 EAj  
void CCaptureDlg::OnAbout() h,{Q%sqO  
{ l\Ozy  
 CAboutDlg dlg; # `=Zc7gf  
 dlg.DoModal(); 0%bCP/  
} )M0`dy{1  
[-\Y?3  
void CCaptureDlg::OnBrowse() :^y!z1\2(7  
{ r<0E[ ~  
 CString str; dBI-y6R  
 BROWSEINFO bi; LtRRX@qJw  
 char name[MAX_PATH];  u 8o!  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); eu5te0{G  
 bi.hwndOwner=GetSafeHwnd(); rf0Z5.  
 bi.pszDisplayName=name; Nk9=A4=|  
 bi.lpszTitle="Select folder"; x;[ .ZzQ  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ]+:yfDtZd  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); G`l\R:Q  
 if(idl==NULL) Ii+3yE@c  
  return; !` 1h *}  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Ke4oLF2  
 str.ReleaseBuffer(); wNi%u{T  
 m_Path=str; lfAy$qP"}  
 if(str.GetAt(str.GetLength()-1)!='\\') Iynks,ikA  
  m_Path+="\\"; 1NP  
 UpdateData(FALSE); Lc~m`=B  
} IBNg2Y  
PzPNvV/o  
void CCaptureDlg::SaveBmp() 9i\}^ s2  
{ z<eu=OD4t  
 CDC dc; P"NI> HM  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %R$)bGT  
 CBitmap bm; im*sSz 0 (  
 int Width=GetSystemMetrics(SM_CXSCREEN); _-fLD  
 int Height=GetSystemMetrics(SM_CYSCREEN); OmuE l>  
 bm.CreateCompatibleBitmap(&dc,Width,Height); "1s ]74  
 CDC tdc; 9we];RYK  
 tdc.CreateCompatibleDC(&dc); <l1/lm<#  
 CBitmap*pOld=tdc.SelectObject(&bm); +(Y\w^@%H  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .Vt|;P}  
 tdc.SelectObject(pOld); =+X*$'<J  
 BITMAP btm; wA{) 9.  
 bm.GetBitmap(&btm); 1tXc7NA<  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; k Fl* Im  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); [g}^{ $`  
 BITMAPINFOHEADER bih; VQ!4( <XD  
 bih.biBitCount=btm.bmBitsPixel; o2(w  
 bih.biClrImportant=0; ANPG3^w  
 bih.biClrUsed=0; {W?!tD43"  
 bih.biCompression=0; &K]|{1+  
 bih.biHeight=btm.bmHeight; `x=kb;  
 bih.biPlanes=1; n^QDMyC;I  
 bih.biSize=sizeof(BITMAPINFOHEADER); Rb<| <D+  
 bih.biSizeImage=size; > X  AB#  
 bih.biWidth=btm.bmWidth; +]t9kr  
 bih.biXPelsPerMeter=0; =O8YU)#  
 bih.biYPelsPerMeter=0; 4`~OxL  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); B#."cg4VR  
 static int filecount=0; {;bec%pq0  
 CString name; 8;=?F>]xn  
 name.Format("pict%04d.bmp",filecount++); BfCib]V9C  
 name=m_Path+name; h1>.w pr  
 BITMAPFILEHEADER bfh; Rt%Dps%  
 bfh.bfReserved1=bfh.bfReserved2=0; .~'q yD2V  
 bfh.bfType=((WORD)('M'<< 8)|'B');  qjfv9sU  
 bfh.bfSize=54+size; A f?&VD4K  
 bfh.bfOffBits=54; :%Z)u:~':  
 CFile bf; /C<} :R  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /? j^Qu  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); e ]>{?Z  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "2"*3R<Y  
  bf.WriteHuge(lpData,size); @7PE&3  
  bf.Close(); A&'HlI% J  
  nCount++; (aCl*vV1  
 } L3Q1az!Ct  
 GlobalFreePtr(lpData); I(WND/&  
 if(nCount==1) \t&6$"n(B6  
  m_Number.Format("%d picture captured.",nCount); sEfGf.  
 else CtDS lJ  
  m_Number.Format("%d pictures captured.",nCount); dR /UXzrc  
  UpdateData(FALSE); >BQF<  
} TA Yt:  
;v+CQx  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) >Q\H1|?  
{ J=]w$e ?.P  
 if(pMsg -> message == WM_KEYDOWN) u= +  
 { 0\}j[-`pF  
  if(pMsg -> wParam == VK_ESCAPE) Js#c9l{{  
   return TRUE; M!6bf  
  if(pMsg -> wParam == VK_RETURN) |V~P6o(/  
   return TRUE; GrQAho  
 } Mw5!9@Fc7  
 return CDialog::PreTranslateMessage(pMsg); k~?}z.g(  
} ?R{?Qv  
f,a4LF  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) J2[QHr&tn  
{ \T]"pE+8l  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Z/RUrYeb  
  SaveBmp(); <,hBoHZSL  
  return FALSE; /7"1\s0U  
} ?H c A&  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ yRi/YR#  
 CMenu pop; /eMZTh*1P  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); h5l Lb+  
 CMenu*pMenu=pop.GetSubMenu(0); Pd;ClMa%  
 pMenu->SetDefaultItem(ID_EXITICON); &lS0"`J=  
 CPoint pt; X5/{Mx`8Oz  
 GetCursorPos(&pt); i:8^:(i  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); qRGb3l  
 if(id==ID_EXITICON) #f~a\}$I  
  DeleteIcon(); jb![ Lp  
 else if(id==ID_EXIT) jRkq^}  
  OnCancel(); ;Gs**BB&  
 return FALSE; 9iy|=  
} E\*",MGL  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); O({_x@  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) -9*WQU9R  
 AddIcon(); B;~agr  
 return res; D5m\u$~V  
} uY~A0I5Z  
g&vEc1LNo  
void CCaptureDlg::AddIcon() _z5CplO  
{ dJ^`9W  
 NOTIFYICONDATA data; YcV~S#b  
 data.cbSize=sizeof(NOTIFYICONDATA); k0IU~y%  
 CString tip; WO9/rF_  
 tip.LoadString(IDS_ICONTIP); u" g p">  
 data.hIcon=GetIcon(0); *a%PA(%6  
 data.hWnd=GetSafeHwnd(); &Kp+8D*  
 strcpy(data.szTip,tip); DS2$w9!  
 data.uCallbackMessage=IDM_SHELL; "y0 A<-~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; \IfgL$+  
 data.uID=98; \8D~,$,``|  
 Shell_NotifyIcon(NIM_ADD,&data); k>CtWV5B  
 ShowWindow(SW_HIDE); %4Zy1{yKs_  
 bTray=TRUE; 6I#DlAU@v  
} ?63JQ.;  
<6~;-ZQY  
void CCaptureDlg::DeleteIcon() |]cDz  
{ ?&m]du#6  
 NOTIFYICONDATA data;  vB*oI~<  
 data.cbSize=sizeof(NOTIFYICONDATA); XE*bRTEw  
 data.hWnd=GetSafeHwnd(); se HbwO3 b  
 data.uID=98; *KH@u  
 Shell_NotifyIcon(NIM_DELETE,&data); "%t`I)  
 ShowWindow(SW_SHOW); Q$L(fH kw  
 SetForegroundWindow(); np^<HfYV  
 ShowWindow(SW_SHOWNORMAL); a?~csP^?}  
 bTray=FALSE; .b oizW1+  
} E57{*C  
SqF.DB~  
void CCaptureDlg::OnChange() a3O_#l-Z  
{ E}9ldM=]s  
 RegisterHotkey(); z xUj1  
} Pm(:M:a  
=Fy8rTdk6r  
BOOL CCaptureDlg::RegisterHotkey() otD?J= B  
{ =L),V~b  
 UpdateData(); f\U&M,L\ '  
 UCHAR mask=0; :yjK*"T|OD  
 UCHAR key=0; /&as)  
 if(m_bControl) fbTw6Fde$  
  mask|=4; fR%1FXpK&  
 if(m_bAlt) hUvuq,LH_  
  mask|=2; SuH.lCF-g  
 if(m_bShift) !LOors za  
  mask|=1; {a8^6dm*E  
  key=Key_Table[m_Key.GetCurSel()]; bTQa'y`3  
 if(bRegistered){ 35 5Sd;*  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); t{8v(}  
  bRegistered=FALSE; _<RR`  
 }  L|lmStwe  
 cMask=mask; /dJ)TW(Ir  
 cKey=key; J2< QAX  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); !_-sTZ  
 return bRegistered; W({TC  
} ''OInfd?  
O< tnM<"(  
  四、小结 k)usUP'  
,mjfZ*N  
  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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