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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: XPc9z}/(e  
  p%1xj2 ?nN  
  一、实现方法 SX Hru Z  
F8|5_214'  
  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: 1+16i=BF)  
N=O+X~  
#pragma data_seg("shareddata") L]/\C{}k  
HHOOK hHook =NULL; //钩子句柄 )rs|=M=Xk  
UINT nHookCount =0; //挂接的程序数目 +(QMy&DtS  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 f{+LCMbC6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 >/kPnpJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey H 'WFORso[  
static int KeyCount =0; g6[/F-3Qlf  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 h-?q6O/|  
#pragma data_seg() 0I(GB;E  
(/9.+V_  
  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。 aIn)']  
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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: jza}-=&+e  
}\`-G+i{W  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR *0Wi^f  
cKey,UCHAR cMask) H}jK3;8E  
{ 1A`?y& Ll  
 BOOL bAdded=FALSE; 6g~o3  
 for(int index=0;index<MAX_KEY;index++){ i-i}`oN  
  if(hCallWnd[index]==0){ 5Gw!9{ke  
   hCallWnd[index]=hWnd; \Age9iz&  
   HotKey[index]=cKey; 3zA8pI w  
   HotKeyMask[index]=cMask; a.Rp#}f  
   bAdded=TRUE; 1,%#O;ya  
   KeyCount++; `aO@N(  
   break; RF,=bOr19  
  } t]u(jX)  
 } 3IJI5K_  
 return bAdded; T;4gcJPn"M  
} !7Yt`l$$z  
//删除热键 lt2Nwt0bv  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^;Hi/KvM\  
{ 3G%XG{dg  
 BOOL bRemoved=FALSE; !Z+*",]_  
 for(int index=0;index<MAX_KEY;index++){ 5ykk11!p$  
  if(hCallWnd[index]==hWnd){ U'h[ {ek  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )L(d$N=Bd  
    hCallWnd[index]=NULL; 'n>3`1E,  
    HotKey[index]=0; J1c&"Oh  
    HotKeyMask[index]=0; lkSz7dr@  
    bRemoved=TRUE; (8@h F#N1  
    KeyCount--; [F AOp@7W  
    break; u]]5p[ |S  
   } [)J49  
  } #g-*n@ 1  
 } L?D~~Jb  
 return bRemoved; cvs"WX3  
} ~-`BSR  
`%mBu`A  
p~d)2TC4#  
  DLL中的钩子函数如下: }VGI Y>v  
u':0"5}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :m)Rmwn_  
{ E-tNB{r@  
 BOOL bProcessed=FALSE; +Qi52OG  
 if(HC_ACTION==nCode) }TX'Z?Lq  
 { D|Ihe%w-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 +SuUI-.  
   switch(wParam) ku[=QsMv  
   {  x3I%)@-Z  
    case VK_MENU: c~pUhx1(  
     MaskBits&=~ALTBIT; ,Zcx3C:#  
     break; Q:fUM[  
    case VK_CONTROL: 1 <qVN'[  
     MaskBits&=~CTRLBIT; .X<"pd*@e  
     break; 1n"+~N^\  
    case VK_SHIFT: .2{C29g  
     MaskBits&=~SHIFTBIT; "13 :VTs[5  
     break; s:jL/%+COZ  
    default: //judge the key and send message O275AxaN  
     break; YnO1Lf@  
   } `~aLSpB65  
   for(int index=0;index<MAX_KEY;index++){  CK!pH{n+  
    if(hCallWnd[index]==NULL) -B3w RAEt  
     continue; 9i2vWSga  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) XvzV lKL  
    { ?/l}(t$H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Xv5Ev@T  
     bProcessed=TRUE; Y(I*%=:$  
    } |H+k?C-w  
   } ZAo)_za&mH  
  } Y%?!AmER  
  else if((lParam&0xc000ffff)==1){ //有键按下 vu.S>2Wv  
   switch(wParam) s!o<Pd yJK  
   { X$9D0;L  
    case VK_MENU: E~Up\f  
     MaskBits|=ALTBIT; aIt 0;D  
     break; "za*$DU  
    case VK_CONTROL: k0 e|8g X  
     MaskBits|=CTRLBIT; K` _E>k  
     break; gH{\y5%rO  
    case VK_SHIFT: [>Kxm  
     MaskBits|=SHIFTBIT; b1>$sPJ+  
     break; 4qSS<SqY  
    default: //judge the key and send message qYu!:xa8  
     break; (krG0S:0Q  
   } RH'F<!p  
   for(int index=0;index<MAX_KEY;index++){ TNPGw!  
    if(hCallWnd[index]==NULL) FO'. a  
     continue; >A'!T'"~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m1$P3tZPn  
    { VzYP:QRz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4;c_%=cU  
     bProcessed=TRUE; S5pP"&I[  
    } 85@6uBh  
   } 8DS5<  
  } _Fh0^O@  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 <T_Nlar^^  
   for(int index=0;index<MAX_KEY;index++){ X8l1xD  
    if(hCallWnd[index]==NULL) Q-dHR i  
     continue; f?<M3P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $ E~Lu$|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); CL}I:/zRB  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 `SS~=~WY  
   } I{g2q B$6  
  } NW>:Lz ?"  
 } 08jUVHdt  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2|NyAtPb5  
} QsF<=b~  
c{4nW|/W  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: F=T.*-oS3  
eg~^wi  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); pu)9"Ad[ G  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BK\~I  
h }%M  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: MVL }[J  
{FmFu$z+[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) u/:Sf*;?  
{ "vRqtEBO@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) \utH*;J|x  
 { dv9Pb5i  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 a5~C:EU0  
  SaveBmp(); n_Hn k4  
  return FALSE; 3{L vKe  
 } [ MXXY  
 …… //其它处理及默认处理 ?QIQ,?.  
} &fy8,}  
x2&! PpM  
o-CJdOS  
  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。 "N/K*  
S+xGHi)  
  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。 ? A#z~;X@  
:pjK\  
  二、编程步骤 eD1MP<>h  
 p|8Fl  
  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"; rHdP4:n  
WI 4_4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; |Gs-9+'y  
2?nyPqT3AM  
  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; :@8.t,|  
! tPK"k  
  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; ZXDMbMD  
;Wh[q*A  
  5、 添加代码,编译运行程序。 RkV3_c  
]{U*+K%,J  
三、程序代码 g(r'Y#U  
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///////////////////////////////////// Hook.h : main header file for the HOOK DLL jW$f(qAbm  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) n$0)gKN7  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ z'K7J'(R  
#if _MSC_VER > 1000 G}xBYc0b  
#pragma once W2(=m!:U  
#endif // _MSC_VER > 1000 xs`gN  
#ifndef __AFXWIN_H__ %7wzGtM]ps  
#error include 'stdafx.h' before including this file for PCH 2}Plr{s9  
#endif AX Jj"hN  
#include "resource.h" // main symbols vCo}-b-j  
class CHookApp : public CWinApp W",jZ"7  
{ vgZPDf|  
 public: ghQsS|)p.  
  CHookApp(); M6Z`Pwv];  
  // Overrides  !3M!p&  
  // ClassWizard generated virtual function overrides 95&sFT C  
  //{{AFX_VIRTUAL(CHookApp) 4GejT(U  
 public: 4i&!V9@:  
  virtual BOOL InitInstance(); 'u%;6'y  
  virtual int ExitInstance(); Z:gsguX  
  //}}AFX_VIRTUAL AG%es0D[H  
  //{{AFX_MSG(CHookApp) +Ws}a  
  // NOTE - the ClassWizard will add and remove member functions here. EMH}VigR  
  // DO NOT EDIT what you see in these blocks of generated code ! yXl.Gq>]{  
  //}}AFX_MSG s/^= WV  
  DECLARE_MESSAGE_MAP() DYk->)   
}; h4xdE 0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 62'0)Cy^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); J@{ Bv%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =,Um;hU3r  
BOOL InitHotkey(); a #**96Av  
BOOL UnInit(); ^o<Nz8  
#endif F+^[8zK^  
]@]"bF!Dn  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. t$D[,$G9  
#include "stdafx.h" Z{)|w=  
#include "hook.h" 2YEn)A@8  
#include <windowsx.h> . k DCcnm  
#ifdef _DEBUG jo:p*Q "F  
#define new DEBUG_NEW bbA<Zp  
#undef THIS_FILE ~;a* Oxt  
static char THIS_FILE[] = __FILE__; )p](*Z^  
#endif NPq2C8:  
#define MAX_KEY 100 oYm"NDS_.  
#define CTRLBIT 0x04 $k=rd#3  
#define ALTBIT 0x02 iU|C<A%Hh  
#define SHIFTBIT 0x01 -/*{^[  
#pragma data_seg("shareddata") w5R9\<3L  
HHOOK hHook =NULL; YWd(xm"4  
UINT nHookCount =0; kQcQi}e  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ECfY~qK  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Ok"wec+,  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 9uo\&,,  
static int KeyCount =0; 8u23@?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ]qQB+]WN  
#pragma data_seg() 2!`Z3>Oa  
HINSTANCE hins; A[Xw|9  
void VerifyWindow(); !LESRh?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) cv&hT.1  
//{{AFX_MSG_MAP(CHookApp) z`6KX93  
// NOTE - the ClassWizard will add and remove mapping macros here. "K]4j]yU  
// DO NOT EDIT what you see in these blocks of generated code! @}}1xP4Sr  
//}}AFX_MSG_MAP ^U1 +D^AJ  
END_MESSAGE_MAP() $(hZw  
@g?z>n n  
CHookApp::CHookApp() A#\X-8/  
{ D^4V"rq  
 // TODO: add construction code here, FpYoCyD}  
 // Place all significant initialization in InitInstance I!%@|[ Ow  
} `Q[$R&\  
 n6dg   
CHookApp theApp; \Bf{/r5x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |LhuZ_;1xo  
{ V6o,}o&-  
 BOOL bProcessed=FALSE; {GY$J<5=  
 if(HC_ACTION==nCode) RAa1KOxZX  
 { -#hl& ^u$  
  if((lParam&0xc0000000)==0xc0000000){// Key up ttxOP  
   switch(wParam) hTqJDP"&F  
   { +%^xz 1m  
    case VK_MENU: svII =JB  
     MaskBits&=~ALTBIT; Xp@OIn  
     break; {rr\hl-$  
    case VK_CONTROL: E_#&L({|@  
     MaskBits&=~CTRLBIT; R2gax;  
     break; m{" zFD/  
    case VK_SHIFT: @bE?WXY  
     MaskBits&=~SHIFTBIT; H$HhB8z3  
     break; 0_)\e  
    default: //judge the key and send message |hAGgo/03  
     break; (yVI<Os{a  
   } dv: &N  
   for(int index=0;index<MAX_KEY;index++){ xr-scdh2  
    if(hCallWnd[index]==NULL) "^7Uk#! 7  
     continue; *+ayC{!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nfR5W~%*:  
    { PI?[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 0J B"@U&-  
     bProcessed=TRUE; v\Gu  
    } vOU -bF%u  
   } ekXHfA!i%  
  } l K%Hb=  
  else if((lParam&0xc000ffff)==1){ //Key down a$-ax[:\sm  
   switch(wParam) 37DvI&  
   { SJmri]4K  
    case VK_MENU: Si(?+bda0c  
     MaskBits|=ALTBIT; }r[BME  
     break; W*#/@/5  
    case VK_CONTROL: jLU)S)  
     MaskBits|=CTRLBIT; SX.v5plhc  
     break; >U]. k8a)  
    case VK_SHIFT: qx NV~aK  
     MaskBits|=SHIFTBIT; auU{I y   
     break; /fEXAk  
    default: //judge the key and send message Yy5F'RY  
     break; UKdzJEhG  
   } GWsFW[T?~  
   for(int index=0;index<MAX_KEY;index++) [DviN  
   { w ;O '6"  
    if(hCallWnd[index]==NULL) B:SRHd{*Wu  
     continue; *&km5@*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Sr0mA M  
    { q^)(p' X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Spb'jAKj'  
     bProcessed=TRUE; ?M);wBe(  
    } -b<+Ra  
   } 1{qg@xlj  
  } %1<|.Dmd  
  if(!bProcessed){ +Y+kx"8  
   for(int index=0;index<MAX_KEY;index++){ 92R{V%)G  
    if(hCallWnd[index]==NULL) 7UiU3SUcg  
     continue; K} @q+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) a7ty&[\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); v2^CBKZ+  
   } >{[J+f{~|  
  } y[# U/2  
 } Z~ (QV0}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~EymD *  
} =6hf'lP  
+a{>jzR  
BOOL InitHotkey() P^z)]K#sw  
{ d4U_Wu&  
 if(hHook!=NULL){ -#@;-2w  
  nHookCount++; {Ffr l(*  
  return TRUE; bk 2vce&  
 } 2epL!j)Wh  
 else YR>xh2< 9  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); fQ@["b   
  if(hHook!=NULL) o5d)v)Rx=  
   nHookCount++; 9 (Z)c  
  return (hHook!=NULL); QGa"HG5NF  
} bk|>a=o3  
BOOL UnInit() I[/u5V_b'  
{ '?nhpT^  
 if(nHookCount>1){ ?:,j9:m?  
  nHookCount--; "Y6 f.rB  
  return TRUE; V_:/#G]jeG  
 } &F)lvtt|  
 BOOL unhooked = UnhookWindowsHookEx(hHook); *@< jJP4  
 if(unhooked==TRUE){ jw H)x  
  nHookCount=0; p("do1:  
  hHook=NULL; W/+0gh7`,(  
 } 6mZFsB  
 return unhooked; .nnAI@7E  
} _nF_RpS  
JL1Whf  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S; >_9  
{ IcN|e4t^J+  
 BOOL bAdded=FALSE; N 6eY-`4y  
 for(int index=0;index<MAX_KEY;index++){ 2gi`^%#k]  
  if(hCallWnd[index]==0){ FTn[$q  
   hCallWnd[index]=hWnd; t_3XqjuA  
   HotKey[index]=cKey; P<U{jkM\/  
   HotKeyMask[index]=cMask; eG<32$I  
   bAdded=TRUE; i4l?q#X  
   KeyCount++; 6w' ^,V  
   break; D0~mu{;c$  
  }  I2b[  
 } &WIPz\  
 return bAdded; ;G ?_^ 0  
} 3>Yec6Hs  
!,]_tw>R  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |&7l*j(\  
{ G'%mmA\  
 BOOL bRemoved=FALSE; <7qM;) g  
 for(int index=0;index<MAX_KEY;index++){ $8b/"Qm  
  if(hCallWnd[index]==hWnd){ k;]&`c^5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0 @>3fR  
    hCallWnd[index]=NULL; 9d v+u6)  
    HotKey[index]=0; "&An9H'  
    HotKeyMask[index]=0; U_+>4zdm  
    bRemoved=TRUE; XWk^$"  
    KeyCount--; Xln'~5~)  
    break; \ /o`CV{O  
   } ie5"  
  } (%".=x-  
 } yzYPT}t  
 return bRemoved; w%kxY5q  
} &N,c:dNe  
,+f'%)s_x  
void VerifyWindow() ibh!8"[  
{ E0w>c'kH  
 for(int i=0;i<MAX_KEY;i++){ y5>H>NS  
  if(hCallWnd!=NULL){ *9G;n!t  
   if(!IsWindow(hCallWnd)){ SJL?(S*  
    hCallWnd=NULL; C{4[7  
    HotKey=0;  RszqDm  
    HotKeyMask=0; SNcaIzbr  
    KeyCount--; B?k75G  
   } \ ^_3Yw  
  } YS &3+Tp  
 } 74>.E^ /x  
} |]V0sgpoZ  
\S _ycn  
BOOL CHookApp::InitInstance() (@]{=q<  
{ ~G"5!,J  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Rc @p!Xi  
 hins=AfxGetInstanceHandle(); rZ<@MV|d  
 InitHotkey(); rB-&'#3%  
 return CWinApp::InitInstance(); ~ujY+ {  
} wPOQy ~:  
.(D-vkz'  
int CHookApp::ExitInstance() $Z #  
{ kd2+k4@#  
 VerifyWindow(); qXgg"k%A\  
 UnInit(); ]wZG4A  
 return CWinApp::ExitInstance(); PXWBc\  
} 0P z"[  
2 g,UdG  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file C/!kMMh>vV  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) nF]lSg&]X  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ c<|;<8ew  
#if _MSC_VER > 1000 ftRf~5d2  
#pragma once dG\dGSZ\h  
#endif // _MSC_VER > 1000 BTqY _9  
!CUrpr/*  
class CCaptureDlg : public CDialog (k4>I"x)  
{ Q! WXFS  
 // Construction J'W6NitMr  
 public: ?!KqDI  
  BOOL bTray; e~oI0%xl^  
  BOOL bRegistered; wP29 xV"5  
  BOOL RegisterHotkey(); j8P=8w{  
  UCHAR cKey; R!5j1hMN`  
  UCHAR cMask; 6cDe_v|,  
  void DeleteIcon(); _DS_AW}D  
  void AddIcon(); !{jDZ?z{h  
  UINT nCount; qq G24**9v  
  void SaveBmp(); 7vZznN8e  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor M, f6UYo=  
  // Dialog Data @-)jU!  
  //{{AFX_DATA(CCaptureDlg) 4@- 'p  
  enum { IDD = IDD_CAPTURE_DIALOG }; 0@k)C z[0;  
  CComboBox m_Key; _46 y  
  BOOL m_bControl; *>I4X=  
  BOOL m_bAlt; v,^2'C$o  
  BOOL m_bShift; g m'8,ZL  
  CString m_Path; rZEL7{  
  CString m_Number; Dn1aaN6  
  //}}AFX_DATA f5'Cq)Vw_  
  // ClassWizard generated virtual function overrides < j^8L^  
  //{{AFX_VIRTUAL(CCaptureDlg) {FNmYneh?6  
 public: 4-1=1)c*  
  virtual BOOL PreTranslateMessage(MSG* pMsg); +G)L8{FY(  
 protected: rE)lt0mkv  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support K?`Fpg (  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);  Em?bV(  
  //}}AFX_VIRTUAL DvhJkdLB>  
  // Implementation }f45>@uMW  
 protected: >UlAae44  
  HICON m_hIcon; $}+t|`*q8]  
  // Generated message map functions RDGefxv  
  //{{AFX_MSG(CCaptureDlg) p,0J $L  
  virtual BOOL OnInitDialog(); Z7)la |  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); vr/*z euA  
  afx_msg void OnPaint(); O1[`2kj^HB  
  afx_msg HCURSOR OnQueryDragIcon(); ;hzm&My  
  virtual void OnCancel(); Q*&k6A"jx  
  afx_msg void OnAbout(); 3 vr T`  
  afx_msg void OnBrowse(); W~b->F  
  afx_msg void OnChange();  $I}7EI  
 //}}AFX_MSG `3GYV|LeQ  
 DECLARE_MESSAGE_MAP() 3HCH-?U5  
}; <u`m4w  
#endif ;tg9$P<85  
?o$ hlX  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file J%r$jpd'  
#include "stdafx.h" 3M~*4  
#include "Capture.h" J?DJA2o  
#include "CaptureDlg.h" `,~8(rIM  
#include <windowsx.h> "0Ca;hSLM2  
#pragma comment(lib,"hook.lib") IHC {2 ^  
#ifdef _DEBUG xQ~}9Kt\  
#define new DEBUG_NEW ,0k3Qi%  
#undef THIS_FILE lfTDpKz3D  
static char THIS_FILE[] = __FILE__; [ H|ifi  
#endif Oc A;+}>  
#define IDM_SHELL WM_USER+1 A43 mX !g\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); q}x+#[Ef  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @ (4$<><  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; }*Z *wC  
class CAboutDlg : public CDialog uPh/u!  
{ ~&{LMf  
 public: pd%h5|*n;  
  CAboutDlg(); 'fo.1  
  // Dialog Data ):<9j"Z;At  
  //{{AFX_DATA(CAboutDlg) {zhajY7  
  enum { IDD = IDD_ABOUTBOX }; r" 4u)H>  
  //}}AFX_DATA *M^(A}+O  
  // ClassWizard generated virtual function overrides ?azi(ja  
  //{{AFX_VIRTUAL(CAboutDlg) Lfr>y_i;F  
 protected: Ynxzkm S  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O> .gcLA  
  //}}AFX_VIRTUAL Z2@_F7cXt  
  // Implementation D0 5JQ*  
 protected: ;cpQ[+$nKp  
  //{{AFX_MSG(CAboutDlg) _98 %?0  
  //}}AFX_MSG +T!7jC(O Q  
  DECLARE_MESSAGE_MAP() ZlEQzL~  
}; _4^#VD#f  
.0=VQU  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) mssCnr;  
{ u"hv _ml  
 //{{AFX_DATA_INIT(CAboutDlg) SyL:=NZ  
 //}}AFX_DATA_INIT qE:/~Q0  
} 8r{:d i*  
"fH"U1Bw  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) VUd=|$'J  
{ 9=o;I;I  
 CDialog::DoDataExchange(pDX); ?hfyQhR  
 //{{AFX_DATA_MAP(CAboutDlg) F4:giu ht  
 //}}AFX_DATA_MAP ^ s.necg0  
} vXI2u;=y  
pXap<T  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) M?[~_0_J  
 //{{AFX_MSG_MAP(CAboutDlg) FV~ENpncP  
 // No message handlers x%]5Q/|Ur  
 //}}AFX_MSG_MAP N$I@]PL  
END_MESSAGE_MAP() BK *Bw,KQ<  
.G/>X%X  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) M dKkj[#  
: CDialog(CCaptureDlg::IDD, pParent) ~[[(_C3  
{ mu$0x)  
 //{{AFX_DATA_INIT(CCaptureDlg) =]F;{x  
  m_bControl = FALSE; D:Rr|m0Tk  
  m_bAlt = FALSE; <<vT"2Q]  
  m_bShift = FALSE; sQl`0|VH  
  m_Path = _T("c:\\"); Yt3 +o<  
  m_Number = _T("0 picture captured."); 1ZZ}ojq  
  nCount=0; f5tkv<) %  
  bRegistered=FALSE; F4X0DRC,G  
  bTray=FALSE; &\p=s.y?j  
 //}}AFX_DATA_INIT 7iijATc  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 EEI !pi  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6C@W6DR3N  
} ca6kqh"  
0pW?v:!H  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) yH<a;@C  
{ 4+1aW BJ2  
 CDialog::DoDataExchange(pDX); h+d  \u  
 //{{AFX_DATA_MAP(CCaptureDlg) u&-Zh@;Q7  
  DDX_Control(pDX, IDC_KEY, m_Key); ?7|6jTIs  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); .5AyB9a%&  
  DDX_Check(pDX, IDC_ALT, m_bAlt); J{w[vcf  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); xtq='s8e  
  DDX_Text(pDX, IDC_PATH, m_Path); P \k5%  
  DDX_Text(pDX, IDC_NUMBER, m_Number); \:/~IZdzF  
 //}}AFX_DATA_MAP c|hT\1XR,  
} )1PjI9M  
m,|)$R  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0x1#^dII  
//{{AFX_MSG_MAP(CCaptureDlg) \ )'`F; P  
 ON_WM_SYSCOMMAND() #]vs*Sz  
 ON_WM_PAINT() Ex`!C]sQ  
 ON_WM_QUERYDRAGICON() 3v?R"2\qS  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) v<u`wnt  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) |,)=-21&;  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 9V/:1I0?&0  
//}}AFX_MSG_MAP ^hyY,X  
END_MESSAGE_MAP() _*1{fvv0{  
I[g;p8jr  
BOOL CCaptureDlg::OnInitDialog() ,z@"pI b  
{ 9vL n#_  
 CDialog::OnInitDialog(); z]d2 rzV(_  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Nk ~"f5q7  
 ASSERT(IDM_ABOUTBOX < 0xF000); +3wVcL  
 CMenu* pSysMenu = GetSystemMenu(FALSE); /&jh10}H  
 if (pSysMenu != NULL) j~;kh_  
 { bd & /B&a  
  CString strAboutMenu; Xe. az  
  strAboutMenu.LoadString(IDS_ABOUTBOX); xhTiOt6l  
  if (!strAboutMenu.IsEmpty()) > 3SZD  
  { yKb+bm&5:'  
   pSysMenu->AppendMenu(MF_SEPARATOR); NpLO_-  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); YEiQ`sYKG  
  } H4Lvw8G  
 } g q|]t<'  
 SetIcon(m_hIcon, TRUE); // Set big icon H="E#AC%8/  
 SetIcon(m_hIcon, FALSE); // Set small icon ?ypX``3#s7  
 m_Key.SetCurSel(0); 93]67PL#+  
 RegisterHotkey(); ]hHL[hoFC  
 CMenu* pMenu=GetSystemMenu(FALSE); }:zTz% _K  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); a?K3/0G  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ZOIx+%/Vd#  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND);  O86[`,  
 return TRUE; // return TRUE unless you set the focus to a control b,r{wrLe)  
} XUK!1}  
knb 9s`wR  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) fC<pCdsg  
{ Jb1L[sT2  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) h,!`2_&UQ  
 { ?P>3~3 B  
  CAboutDlg dlgAbout; eY'< UO  
  dlgAbout.DoModal(); u301xc,N<z  
 } fFiFS\''V  
 else ='z4bU  
 { umJ!j&(  
  CDialog::OnSysCommand(nID, lParam); 41oXOB  
 } Op>l~{{{  
} +>*! 3x+sE  
:41Ch^\E  
void CCaptureDlg::OnPaint() +`]AutNv  
{ #*|Gp_l+%  
 if (IsIconic()) /UP1*L  
 { 2}<_l 2  
  CPaintDC dc(this); // device context for painting QoBM2Q YO  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); o-7,P RmKN  
  // Center icon in client rectangle *+rWn*L  
  int cxIcon = GetSystemMetrics(SM_CXICON); DV5K)m&G  
  int cyIcon = GetSystemMetrics(SM_CYICON); +ebmve \+  
  CRect rect; aEvW<jHh  
  GetClientRect(&rect); kh5VuXpe  
  int x = (rect.Width() - cxIcon + 1) / 2; )/mBq#ZS  
  int y = (rect.Height() - cyIcon + 1) / 2; d")TH3pG  
  // Draw the icon gi#g)9HG  
  dc.DrawIcon(x, y, m_hIcon); y c:y}"  
 } k[<Uxh%  
 else @q/E)M?  
 { "x~su?KiA  
  CDialog::OnPaint(); #[B]\HO  
 } ]mZN18#  
} \&#IK9x{  
X Z4q{^o  
HCURSOR CCaptureDlg::OnQueryDragIcon() `SM37({c  
{ *w,C5 f  
 return (HCURSOR) m_hIcon; =4_Er{AT  
} HB:VpNFn  
Q XLHQ_V  
void CCaptureDlg::OnCancel() hztxsvw  
{ '5; /V  
 if(bTray)  U rL|r.  
  DeleteIcon(); LZ-&qh  
  CDialog::OnCancel(); LAjreC<W  
} RIV + _}R  
n5s2\(  
void CCaptureDlg::OnAbout() 6*r#m%|   
{ Zog&:]P'F  
 CAboutDlg dlg; J *nWCL  
 dlg.DoModal(); dh0nB  
} ,C;%AS/  
SDHJX8Hq  
void CCaptureDlg::OnBrowse() u?%FD~l:uU  
{ /+JHnedK  
 CString str; ,We'A R3X  
 BROWSEINFO bi; -.t/c}a#  
 char name[MAX_PATH]; ]X\p\n'@j  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 'MK"*W8QRM  
 bi.hwndOwner=GetSafeHwnd(); ?&_u$Nn  
 bi.pszDisplayName=name; sp8P[W1a  
 bi.lpszTitle="Select folder"; eFXQ~~gOj  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; S!6 ? b5  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9?38/2kX4  
 if(idl==NULL) :c}"a(|  
  return; u6MHdCJ0y  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); O]VHX![Y$  
 str.ReleaseBuffer(); .u3Z*+  
 m_Path=str; peD7X:K\s  
 if(str.GetAt(str.GetLength()-1)!='\\') H_vGa!_  
  m_Path+="\\"; ]@wKm1%v  
 UpdateData(FALSE); c\DMeYrg  
} 0i4XS*vPv  
F|bg2)|du8  
void CCaptureDlg::SaveBmp() .g?Ppma  
{ ~v|NC([(  
 CDC dc; kkU#0p?7  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); kA4bv}  
 CBitmap bm; 1Rd2Xb  
 int Width=GetSystemMetrics(SM_CXSCREEN); tYUg%2G  
 int Height=GetSystemMetrics(SM_CYSCREEN); Q$58 K9  
 bm.CreateCompatibleBitmap(&dc,Width,Height); K*9~ g('  
 CDC tdc; q~6a$8+t  
 tdc.CreateCompatibleDC(&dc); Nf!WqD*je  
 CBitmap*pOld=tdc.SelectObject(&bm); VxW>Xx G0  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 8{DW$Z tR  
 tdc.SelectObject(pOld); f~ P~%  
 BITMAP btm; %pj T?G7  
 bm.GetBitmap(&btm); 8z)J rO}  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; K)N'~jCG  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); S=_*<[W%4  
 BITMAPINFOHEADER bih; - jWXE  
 bih.biBitCount=btm.bmBitsPixel; k, >*.Yoh  
 bih.biClrImportant=0; (MzThGJK_  
 bih.biClrUsed=0; =k\Qx),Ir  
 bih.biCompression=0; y"Ios:v@-  
 bih.biHeight=btm.bmHeight; 5a%i%+;N  
 bih.biPlanes=1; ]QSQr *  
 bih.biSize=sizeof(BITMAPINFOHEADER); k< $(  
 bih.biSizeImage=size; ~@d4p|K  
 bih.biWidth=btm.bmWidth; `b*x}HP$  
 bih.biXPelsPerMeter=0; ,Fzuo:{uy  
 bih.biYPelsPerMeter=0; vn1*D-?  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); .kc{)d*0K  
 static int filecount=0; 5b$QXO  
 CString name; }DFZ9,gQ  
 name.Format("pict%04d.bmp",filecount++); (q}{;  
 name=m_Path+name; ,buo&DT{L  
 BITMAPFILEHEADER bfh; ]6;G#  
 bfh.bfReserved1=bfh.bfReserved2=0; 7-("pp YX=  
 bfh.bfType=((WORD)('M'<< 8)|'B'); @d_9NOmNT  
 bfh.bfSize=54+size; ;MH_pE/m  
 bfh.bfOffBits=54; ZLlAK?N  
 CFile bf; @pN6uDD}R  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ on.m '-s  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [Wn6d:  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #3}!Q0   
  bf.WriteHuge(lpData,size); -'rb+<v  
  bf.Close(); hh8U/dVk*  
  nCount++;  Q5 =  
 } [PH56f  
 GlobalFreePtr(lpData); "sJ@_lp  
 if(nCount==1) }e-D&U  
  m_Number.Format("%d picture captured.",nCount); ffG1QvC|M  
 else &UIS17cT  
  m_Number.Format("%d pictures captured.",nCount); F5 7Kr5X  
  UpdateData(FALSE); 3(3-#MD0  
} (V<pz2\  
y\XWg`X y  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 48LzI@H&  
{ u85?f  
 if(pMsg -> message == WM_KEYDOWN) 9t+:L(*pK  
 { 6yK"g7  
  if(pMsg -> wParam == VK_ESCAPE) ~F13}is  
   return TRUE; jygKw+C  
  if(pMsg -> wParam == VK_RETURN) !~`aEF3  
   return TRUE; paZcTC  
 } `P jS  
 return CDialog::PreTranslateMessage(pMsg); T854}RX[{  
} g?{7DI`  
FF~VV<a  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \me-#: Gu  
{ =~q Xzq  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 17[vq!x6  
  SaveBmp(); :Fdk`aC  
  return FALSE; d(F4-kBd  
} :~\ y<  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ p!7(a yu  
 CMenu pop; S4D~`"4 $/  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 8X)1bNGqhe  
 CMenu*pMenu=pop.GetSubMenu(0); ,lQfsntk'  
 pMenu->SetDefaultItem(ID_EXITICON); 1?{w~cF}  
 CPoint pt; !yu-MpeG  
 GetCursorPos(&pt); zTg&W7oz  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %B(E;t63W  
 if(id==ID_EXITICON) Ns6C xE9  
  DeleteIcon(); \9k{h08s  
 else if(id==ID_EXIT) Z&5cJk W  
  OnCancel(); /_i]bM7W  
 return FALSE; $!K,5^+  
} k(dNHT  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); $j&2bO 5M  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) O4T_p=Xc  
 AddIcon(); N:UA+  
 return res; ^3ysY24Q  
} Kgb<uXk  
v<E_n;@9k  
void CCaptureDlg::AddIcon() 'J:xTp  
{ ?<~P)aVVj  
 NOTIFYICONDATA data; wj9 Hh  
 data.cbSize=sizeof(NOTIFYICONDATA); LEA^o"NW.  
 CString tip; 5Eu`1f?  
 tip.LoadString(IDS_ICONTIP); 7%yP5c B  
 data.hIcon=GetIcon(0); s=1w6ZLD  
 data.hWnd=GetSafeHwnd(); YQaL)t$0  
 strcpy(data.szTip,tip); ~"22X`;h[G  
 data.uCallbackMessage=IDM_SHELL; cWp5pGIzfp  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; NLZUAtx(  
 data.uID=98; #.|MV}6rQ  
 Shell_NotifyIcon(NIM_ADD,&data); >:P-3#e*  
 ShowWindow(SW_HIDE); j,v2(e5:  
 bTray=TRUE; zqm/<]A*l  
} E[tEW0ub  
9On(b|mT  
void CCaptureDlg::DeleteIcon() M~-jPY,+  
{ 0]2@T=*kTY  
 NOTIFYICONDATA data; 5 0<  
 data.cbSize=sizeof(NOTIFYICONDATA); :.?%e{7  
 data.hWnd=GetSafeHwnd(); 3/*<i  
 data.uID=98; <%=@Ue  
 Shell_NotifyIcon(NIM_DELETE,&data); MXynv";<H  
 ShowWindow(SW_SHOW); ;\gHFG}  
 SetForegroundWindow(); 7r$'2">K(  
 ShowWindow(SW_SHOWNORMAL); O],]\M{GL  
 bTray=FALSE; WxS$yUu  
} k[/`G5  
B2)SNhF2Y  
void CCaptureDlg::OnChange() CChCxB  
{ b_-?ZmV^r  
 RegisterHotkey(); hlBqcOpkKg  
} c8M'/{4rH  
99?: 9g  
BOOL CCaptureDlg::RegisterHotkey() R2dCp|6A  
{ <9aa@c57  
 UpdateData(); |Whkq/Zg  
 UCHAR mask=0; 2qDVAq^@  
 UCHAR key=0; ~19&s~  
 if(m_bControl) 0 A6% !h  
  mask|=4; $s!2D"wl n  
 if(m_bAlt) .u&GbM%Ga  
  mask|=2; #H&`wMZZ:  
 if(m_bShift) hV[=  
  mask|=1; >kG: MJj  
  key=Key_Table[m_Key.GetCurSel()]; qb >mUS  
 if(bRegistered){ mE3M$2}  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Ib0@,yS[  
  bRegistered=FALSE; d(;Qe}ok>  
 } WcKL=Z?(  
 cMask=mask; TZ]o6Bb  
 cKey=key; "D.`:9sk0  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ^RE("'+  
 return bRegistered; FAF+}  
} d9yfSZ  
UN7J6$!Cx7  
  四、小结 ;8> TD&]{  
b%D}mxbS  
  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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