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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: T12Zak4.=  
  F+NX [  
  一、实现方法 *:+ZEFMq  
_u;pD-  
  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: @d^DU5ats>  
Xf"< >M  
#pragma data_seg("shareddata") KiFTj$w,  
HHOOK hHook =NULL; //钩子句柄 } 7:T? `V:  
UINT nHookCount =0; //挂接的程序数目 0Ntvd7"`}  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4i&Rd1#0dI  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 8mLW^R:`  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey h-O;5.m-P  
static int KeyCount =0; Q`.q,T8I  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 T~L V\}h  
#pragma data_seg() .v}|Tp&k  
{jwLVKT$  
  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。 IG\Cj7{K^  
aO(iKlZ$  
  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: 'Q 7^bF^  
8lDb<i  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR k' Fu&r  
cKey,UCHAR cMask) A)j!Wgs^z  
{  ~H   
 BOOL bAdded=FALSE; }kItVx  
 for(int index=0;index<MAX_KEY;index++){ n'q:L(`M  
  if(hCallWnd[index]==0){ 5`:d$rv  
   hCallWnd[index]=hWnd; 0y/31hp  
   HotKey[index]=cKey; IC8%E3  
   HotKeyMask[index]=cMask; A n`*![  
   bAdded=TRUE; SYf1dbc..u  
   KeyCount++; f9},d1k  
   break; |'P$zMAF  
  }  f}*:wj  
 } @TXLg2  
 return bAdded; '3sySsD&O  
} %K=_  
//删除热键 wD$UShnm9-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) { J/Fp#  
{ RjgJIVm(  
 BOOL bRemoved=FALSE; h~CLJoK<  
 for(int index=0;index<MAX_KEY;index++){ YAeF*vP  
  if(hCallWnd[index]==hWnd){ 7Nk|9t  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ "lt5gu!`u  
    hCallWnd[index]=NULL; ,LSiQmV5  
    HotKey[index]=0; 4$ihnb`DQN  
    HotKeyMask[index]=0; v2:i'j6  
    bRemoved=TRUE; /K1cP>oE  
    KeyCount--; h7T),UL  
    break; `F&~SU,  
   } u,d5/`E  
  } )u=W?5%=}  
 } y5O &9Ckw  
 return bRemoved; 79d(UG'O  
} XpE847!soL  
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|S |'o*u  
  DLL中的钩子函数如下: [Y@>,B!V  
H|wP8uQC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]{\M,txo8  
{ 1(:!6PY  
 BOOL bProcessed=FALSE; <;~u@^>  
 if(HC_ACTION==nCode) rcMf1\  
 { y@LiUe5  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 esx/{j;<u  
   switch(wParam) W-&V:S{<  
   {  0x]?rd+q8Q  
    case VK_MENU: RB %y($  
     MaskBits&=~ALTBIT; LGZa l&9AY  
     break; NV9JMB{q  
    case VK_CONTROL: K5XW&|tY!  
     MaskBits&=~CTRLBIT; Av5:/c.B  
     break; MpZ\ j  
    case VK_SHIFT: Vr( Z;YO  
     MaskBits&=~SHIFTBIT; y35~bz^2  
     break; a@q c?  
    default: //judge the key and send message >{:hadUH  
     break; %-.;sO=g  
   } rvd%z7Z1o  
   for(int index=0;index<MAX_KEY;index++){ !3mt<i]a"  
    if(hCallWnd[index]==NULL) #C?M-  
     continue; |rZMcl/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) LfFXYX^  
    { $YcB=l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); w( XZSE  
     bProcessed=TRUE; SUUN_w~  
    } 3z2 OW@zL$  
   } 6(4d3}F  
  } 6X m'^T  
  else if((lParam&0xc000ffff)==1){ //有键按下 c-Yd> 4+ 1  
   switch(wParam) CPRVSN0b{4  
   { { $yju_[  
    case VK_MENU: j4!O,.!T  
     MaskBits|=ALTBIT; {)!>e  
     break; +FqE fY4j  
    case VK_CONTROL: FN=WU< 5  
     MaskBits|=CTRLBIT; $GGaR x  
     break; y*-_  
    case VK_SHIFT:  fPPP|  
     MaskBits|=SHIFTBIT; SZHgXl3:  
     break; p WJ EFm  
    default: //judge the key and send message (?zD!% k  
     break; <"P-7/j3j  
   } hdrsa}{g  
   for(int index=0;index<MAX_KEY;index++){ ^ W?cuJ8  
    if(hCallWnd[index]==NULL) 3)\fZYu)  
     continue; X|eZpIA45  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )S2yU<6oOt  
    { s:"Sbml  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); xSK#ovH2  
     bProcessed=TRUE; W [K.|8ho  
    } Xw!\,"{s  
   } %%uE^nX>  
  } 1d]F$ >  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 K SO D(  
   for(int index=0;index<MAX_KEY;index++){ tZKw(<am  
    if(hCallWnd[index]==NULL) fZ7AGP   
     continue; Z CPUNtOl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) fTvm2+.nX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); X V;j6g  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 `a|&aj0  
   } !.$L=>:V  
  } /+SLq`'u)  
 } rHX^bcYK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); W_Y8)KxG:L  
} :Q3pP"H,}  
#m{*]mY@  
  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: `;;l {8  
%g.cE}^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); uy3<2L#.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); wAprksZL#  
&.*UVc2+Y  
  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: /]xa}{^B  
!!^z6jpvn  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) c!4F0(n4  
{ crP2jF!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) x I.W-js[  
 { A:r?#7 Ma  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 K\F0nToJ.  
  SaveBmp(); YoKyiO!   
  return FALSE; SE]5cJ'>  
 } IL %]4,  
 …… //其它处理及默认处理 $El-pMq  
} #lP8/-s^  
 XTJD>  
E s5: S#  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 P#~B @d  
{G:y?q'z  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 _]>1(8_N  
E6A"Xo  
  二、编程步骤 )O~[4xV~  
7mi!yTr}  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ;[sW\Ou  
@dDeOnF  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; MePD:;mm^  
G:=hg6 '  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; WKEb '^  
aKbmj  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; pSw/QO9  
:jLL IqhB  
  5、 添加代码,编译运行程序。 =^nb+}Nz(  
G21o @38e  
三、程序代码 l]R0r{{  
Cl}nP UoL  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL do}LaUz  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) +$,Re.WnP  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Pd*[i7zhC  
#if _MSC_VER > 1000 jhNFaBrS  
#pragma once {3tzr;c?  
#endif // _MSC_VER > 1000 _IDZ.\'>$  
#ifndef __AFXWIN_H__ S\e&xUA;|  
#error include 'stdafx.h' before including this file for PCH W7i|uTM  
#endif ,fVD`RR(W?  
#include "resource.h" // main symbols Ux [<g%F"  
class CHookApp : public CWinApp \*xB<mq  
{ !_<6}:ZB  
 public: Bh>L"'.2  
  CHookApp(); }htjT/Nm  
  // Overrides E7fx4kV  
  // ClassWizard generated virtual function overrides BX,)G HE  
  //{{AFX_VIRTUAL(CHookApp) yB*,)x0 @  
 public: -4a9BE".  
  virtual BOOL InitInstance(); WSkGVQu  
  virtual int ExitInstance(); _u`YjzK  
  //}}AFX_VIRTUAL O !L`0 =%c  
  //{{AFX_MSG(CHookApp) '|C3t!H`  
  // NOTE - the ClassWizard will add and remove member functions here. (q> TKM  
  // DO NOT EDIT what you see in these blocks of generated code ! bLgH3[{  
  //}}AFX_MSG wbO6Ag@))  
  DECLARE_MESSAGE_MAP() _FLEz|%~  
}; I2ek`t]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); IV QH p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); tT$OnZu&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C$3*[  
BOOL InitHotkey(); ^u /%zL  
BOOL UnInit(); w2 )Ro:G  
#endif ^NW[)Dq1<  
[m t.2.  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. .J"N}  
#include "stdafx.h" v<qh;2  
#include "hook.h" sGvbL-S-f:  
#include <windowsx.h> S2~cAhR|M  
#ifdef _DEBUG c8qr-x1HG  
#define new DEBUG_NEW US6_5>/  
#undef THIS_FILE n\#YGL<n  
static char THIS_FILE[] = __FILE__; yC,/R371k  
#endif XZ rI w  
#define MAX_KEY 100 ,g`%+s7u  
#define CTRLBIT 0x04 G1"iu8 9d  
#define ALTBIT 0x02 )&DAbB!O  
#define SHIFTBIT 0x01 o_b[*  
#pragma data_seg("shareddata") }2A6W%^>]  
HHOOK hHook =NULL; 15$xa_w}L  
UINT nHookCount =0; fn#8=TIDf  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey )M*w\'M  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT g|=_@ pL  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ?HZp @ &  
static int KeyCount =0; cw;wv+|k  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift -wl j;U  
#pragma data_seg() l{3B }_,  
HINSTANCE hins; <t%gl5}|  
void VerifyWindow(); 6Z/`p~e  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) #c!:&9oU  
//{{AFX_MSG_MAP(CHookApp) y!e]bvN  
// NOTE - the ClassWizard will add and remove mapping macros here. OI R5QH  
// DO NOT EDIT what you see in these blocks of generated code! ajbe7#}  
//}}AFX_MSG_MAP 5:Qz  
END_MESSAGE_MAP() )fH Q7  
'Pz%c}hJ  
CHookApp::CHookApp() T?9D?u?]  
{ Zw]`z*,yRA  
 // TODO: add construction code here, ^S#;   
 // Place all significant initialization in InitInstance Vla,avON  
} =O/Bte.  
a(Y'C`x  
CHookApp theApp; ~iw&^p|=K  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ^-;S&=  
{ WxdQ^#AE  
 BOOL bProcessed=FALSE; 61\u{@o$  
 if(HC_ACTION==nCode) ! \] ^c  
 {  urp|@WZ  
  if((lParam&0xc0000000)==0xc0000000){// Key up ;D5>iek5  
   switch(wParam) B`tq*T%  
   { mDD.D3RS  
    case VK_MENU: KaIKb=4L|  
     MaskBits&=~ALTBIT; pA7-B>Y  
     break;  Xo^8o0xi  
    case VK_CONTROL: 0V%c%]PH  
     MaskBits&=~CTRLBIT;  >DL  
     break; bT,:eA  
    case VK_SHIFT: =j]y?;7q  
     MaskBits&=~SHIFTBIT; 5Z=4%P*I  
     break; Tw~R-SiS`s  
    default: //judge the key and send message &\zYbGU  
     break; W? 7l-k=S  
   } #86N !&x  
   for(int index=0;index<MAX_KEY;index++){ D?|D)"?qb  
    if(hCallWnd[index]==NULL) Z0|5VLk,<{  
     continue; Ht`fC|E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Q @}$b(b  
    { Rq4; {a/j  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); R!VfTAv  
     bProcessed=TRUE; T+8Yd(:hX  
    } uLms0r\@!  
   } F?L]Dff  
  } u09Tlqh0 3  
  else if((lParam&0xc000ffff)==1){ //Key down egmUUuO  
   switch(wParam) kuY^o,u-1e  
   { w7)pBsI  
    case VK_MENU: cJKnB!iL5  
     MaskBits|=ALTBIT; g`EZLDjt  
     break; F)P:lvp<r  
    case VK_CONTROL: .5JIQWE(  
     MaskBits|=CTRLBIT; 6:1`lsP  
     break; ci,(]T +!  
    case VK_SHIFT: qLR;:$]Q&8  
     MaskBits|=SHIFTBIT; 1N5 E  
     break; +Z#=z,.^  
    default: //judge the key and send message .EYL  
     break; 5!0iK9O  
   } $-_" SWG.  
   for(int index=0;index<MAX_KEY;index++) F`}'^>  
   { Y A.&ap  
    if(hCallWnd[index]==NULL) @kXuC<  
     continue; +'H[4g`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L K&c~ Uy  
    { }gSoBu  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); /Qgb t  
     bProcessed=TRUE; r#-  
    } 2[ sY?C  
   } z/Lb1ND8  
  } \Z*:l(  
  if(!bProcessed){ @Z]0c=-+  
   for(int index=0;index<MAX_KEY;index++){ %PW-E($o<  
    if(hCallWnd[index]==NULL) b+s'B4@rb  
     continue; q/U-WQ<+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) a[ULSYEi  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); & -/J~b)"  
   } %Tp9G Gt  
  } LP3#f{U  
 } 6/!:vsa"3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Z<U,]iZB  
} dJ"44Wu+J  
lw=kTYbq  
BOOL InitHotkey() Gm+D1l i  
{ e]<Syrk  
 if(hHook!=NULL){ wXNng(M7  
  nHookCount++; y)r`<B  
  return TRUE; `(W"wC   
 } GTs,?t16/  
 else Y58H.P  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); }#zL)+XI  
  if(hHook!=NULL) F'~r?D  
   nHookCount++; <h(AJX7wsD  
  return (hHook!=NULL); R;"$PH D  
} p5In9s  
BOOL UnInit() +kI}O*s  
{ >A )Sl'  
 if(nHookCount>1){ "t2T*'j{  
  nHookCount--; c{ 'Z.mut  
  return TRUE; Zl_sbIY  
 } cg )(L;  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ^|/<e?~I  
 if(unhooked==TRUE){ Z%#e* O0  
  nHookCount=0; zDg*ds\  
  hHook=NULL; W *0!Z:?  
 } CfOyHhhKX  
 return unhooked; y^r'4zN'  
} \]Y<d  
s-#@t  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /@"mQx~[q  
{ (R=ZI  
 BOOL bAdded=FALSE; ZW M:Wj192  
 for(int index=0;index<MAX_KEY;index++){ _Q:ot'(~0-  
  if(hCallWnd[index]==0){ Gn7\4,C  
   hCallWnd[index]=hWnd; K-YxZAf  
   HotKey[index]=cKey; 2?(/$F9X,  
   HotKeyMask[index]=cMask; 2k!uk6  
   bAdded=TRUE; /{({f?k<\/  
   KeyCount++; xK8m\=#  
   break; 6cg,L:j#  
  } t:dvgRJt*  
 } K*^'t ltJ  
 return bAdded; bLTX_ R  
} Zn1((J7  
0MT?}D&TL  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <F`9;WX  
{ HF*~bL  
 BOOL bRemoved=FALSE; .KYs5Qu  
 for(int index=0;index<MAX_KEY;index++){ nUY)Ln I  
  if(hCallWnd[index]==hWnd){ C\rT'!Uk\Q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ EAY+#>L*  
    hCallWnd[index]=NULL; VK9E{~0=  
    HotKey[index]=0; !'\(OFv9Im  
    HotKeyMask[index]=0; [3irr0D7l  
    bRemoved=TRUE; 1`II%mf[  
    KeyCount--; y;0Zk~R$  
    break; :z?T /9,C  
   } [L7S`Z  
  } ;[zZI~wh  
 } q.:a4w J  
 return bRemoved; (3 ,7  
} )p!") :'fv  
m:EYOe,w  
void VerifyWindow() 4YOLy\"S  
{ a"+VP>4  
 for(int i=0;i<MAX_KEY;i++){ +Km xo4p  
  if(hCallWnd!=NULL){ | /-# N  
   if(!IsWindow(hCallWnd)){ Jx3a7CpX  
    hCallWnd=NULL; _ru<1n[4~  
    HotKey=0; :U1V 2f'l3  
    HotKeyMask=0; O[ans_8  
    KeyCount--; N9c#N%cu  
   } /|Gz<nSc  
  } v@X[0J_8  
 } v&^N+>p  
} r|jBKq~  
k \t6b1.M  
BOOL CHookApp::InitInstance() M~sP|Ha"+  
{ ,! ~U5~  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); c1]\.s  
 hins=AfxGetInstanceHandle(); a(U/70j  
 InitHotkey(); XF4NRs  
 return CWinApp::InitInstance(); a 0FU[*q  
} 5o|u!#6  
Mf:x9#  
int CHookApp::ExitInstance() F, 5}3$  
{ |?fc]dl1]  
 VerifyWindow(); .|ZnU]~T  
 UnInit(); lVb;,C%K  
 return CWinApp::ExitInstance(); [yAR%]i-7  
} `tsqnw  
la !rg#)-X  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file g.EKdvY"%H  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Lj3q?>D*^6  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ K)oN^  
#if _MSC_VER > 1000 B gG+  
#pragma once 6? (8KsaN  
#endif // _MSC_VER > 1000 m+'X8}GC#O  
PDh1*bf{u  
class CCaptureDlg : public CDialog s&OwVQ<M  
{ qo;F]v*pkK  
 // Construction i `8Y/$aT  
 public: w*N9p8hb]  
  BOOL bTray; T\HP5&  
  BOOL bRegistered; UUql"$q  
  BOOL RegisterHotkey(); Neb%D8/Kn  
  UCHAR cKey; +hvVoBCM*  
  UCHAR cMask; |7T!rnr  
  void DeleteIcon(); gs|%3k|  
  void AddIcon(); )@YrHS4  
  UINT nCount; Z.0^:rVp~  
  void SaveBmp(); i`:r2kU:*W  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor whg?X&j\V  
  // Dialog Data {GH 0 J"  
  //{{AFX_DATA(CCaptureDlg) A&0sD}I\K  
  enum { IDD = IDD_CAPTURE_DIALOG }; C>7k|;BvF  
  CComboBox m_Key; xF{<-b  
  BOOL m_bControl; /SD2e@x{U  
  BOOL m_bAlt; .es= w=  
  BOOL m_bShift; p>p=nLK  
  CString m_Path; V# 6`PD6  
  CString m_Number; o'  DXd[y  
  //}}AFX_DATA F;&'C$%  
  // ClassWizard generated virtual function overrides hpym!G  
  //{{AFX_VIRTUAL(CCaptureDlg) ,G,T&W  
 public: m[u 6<C  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Hw/1~O$T  
 protected: IV:Knh+ ?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >b/0i$8  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ODM<$Yo:d  
  //}}AFX_VIRTUAL _hLM\L  
  // Implementation @ B3@M  
 protected: |^@TA=_  
  HICON m_hIcon; Kc\0-3 Z  
  // Generated message map functions Da8qR+*x  
  //{{AFX_MSG(CCaptureDlg) @,sg^KB  
  virtual BOOL OnInitDialog(); .|{*.YE  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Fk 1M5Dm  
  afx_msg void OnPaint(); PHD$E s  
  afx_msg HCURSOR OnQueryDragIcon(); i@_|18F]`  
  virtual void OnCancel(); s\Cl3  
  afx_msg void OnAbout(); <OW` )0UX  
  afx_msg void OnBrowse(); te'<xfG  
  afx_msg void OnChange(); +Mv0X%(N  
 //}}AFX_MSG w>rglm&  
 DECLARE_MESSAGE_MAP() 9!FV. yp%F  
}; )mZ`j.  
#endif K)0 6][ ,  
|)IN20  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file DjL(-7'p  
#include "stdafx.h" %-T]!3"n  
#include "Capture.h" JUU0Tx:`9)  
#include "CaptureDlg.h"  Jb {m  
#include <windowsx.h> <v[,A8Q  
#pragma comment(lib,"hook.lib") K=Fcy#, f  
#ifdef _DEBUG Khw!+!(H  
#define new DEBUG_NEW fwxyZBr  
#undef THIS_FILE g[@]OsX   
static char THIS_FILE[] = __FILE__; |2c'0Ibu  
#endif mKnkHGM  
#define IDM_SHELL WM_USER+1 sOLo[5y'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T?7 ZF+yo6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7,jh44(\=  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^O[q C X  
class CAboutDlg : public CDialog lcIX l&  
{ rMf& HX  
 public: D@d/O  
  CAboutDlg(); WZ ~rsSZSV  
  // Dialog Data 8<?60sj  
  //{{AFX_DATA(CAboutDlg) XF{}St~(  
  enum { IDD = IDD_ABOUTBOX }; Q} f=Ye(&}  
  //}}AFX_DATA RpS'Tz}  
  // ClassWizard generated virtual function overrides 'ei9* 4y  
  //{{AFX_VIRTUAL(CAboutDlg) KH2a 2  
 protected: 0V`0="rQ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]eP&r?B  
  //}}AFX_VIRTUAL m]Z& .,bA  
  // Implementation PGu6hV{  
 protected: /_w oCLwQ#  
  //{{AFX_MSG(CAboutDlg) ,uE WnZ"4  
  //}}AFX_MSG  @;d(>_n  
  DECLARE_MESSAGE_MAP() .#J'+LxFr  
}; (? YTQ8QR  
hMeE@Q0  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) QSEf  
{ @y)-!MHN(8  
 //{{AFX_DATA_INIT(CAboutDlg) RNp3lXf O  
 //}}AFX_DATA_INIT 3MiNJi#=2  
} Q6kkMLh  
:%)l* [  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) y$#mk3(e~t  
{ *)U=ZO6S  
 CDialog::DoDataExchange(pDX); `gD'q5.z;3  
 //{{AFX_DATA_MAP(CAboutDlg) KS1Z&~4  
 //}}AFX_DATA_MAP "F}a nPY  
} :kfl q  
zpiqJEf|'"  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?7/n s>}  
 //{{AFX_MSG_MAP(CAboutDlg) lySeq^y?Q  
 // No message handlers 2|kx:^D p  
 //}}AFX_MSG_MAP KE&Y~y8O\  
END_MESSAGE_MAP() k P>G4$e_v  
%{5mkO&,2  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) oAA%pZ@  
: CDialog(CCaptureDlg::IDD, pParent) t!AHTtI  
{ D%Hz'G0|  
 //{{AFX_DATA_INIT(CCaptureDlg) T Jp(  
  m_bControl = FALSE; ,57g_z]V  
  m_bAlt = FALSE; {SbA(a?B  
  m_bShift = FALSE; ,X)0+DNsq  
  m_Path = _T("c:\\"); 7?qRY9Qu  
  m_Number = _T("0 picture captured."); 2W~,,$ G  
  nCount=0; P+wV.pF|  
  bRegistered=FALSE; \NDSpT<Z  
  bTray=FALSE; }rxFX  
 //}}AFX_DATA_INIT RN]4Is:  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 _}EGk4E  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Gyk>5Q}}  
} qi.|oL9p  
NELQo#kjZ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) d /+sR@\  
{ "$;=8O5O  
 CDialog::DoDataExchange(pDX); q<>LK  
 //{{AFX_DATA_MAP(CCaptureDlg) ,i;kAy)  
  DDX_Control(pDX, IDC_KEY, m_Key); /KO!s,Nk  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); sF C&DTb?  
  DDX_Check(pDX, IDC_ALT, m_bAlt); l&dHH_m3  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); dMp7 ,{FhF  
  DDX_Text(pDX, IDC_PATH, m_Path); (?72 vCc  
  DDX_Text(pDX, IDC_NUMBER, m_Number); cwlXb!S$  
 //}}AFX_DATA_MAP <bDjAVq  
} Y [0 S  
G0^WQQ4  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) t7H2z}06=h  
//{{AFX_MSG_MAP(CCaptureDlg) 403%~  
 ON_WM_SYSCOMMAND() FZ6.<wN  
 ON_WM_PAINT() [#fXmW>N/  
 ON_WM_QUERYDRAGICON() 5][Rvu0  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) +M/04  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) >&f .^p  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 3/H^YM @  
//}}AFX_MSG_MAP 9TjAEeU  
END_MESSAGE_MAP() kZs  
:W_S  
BOOL CCaptureDlg::OnInitDialog() Sd2R $r  
{ yK+76\} I  
 CDialog::OnInitDialog(); VjS %!P  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); h `d(?1  
 ASSERT(IDM_ABOUTBOX < 0xF000); @tdX=\[~  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 6]Q ~c"+5  
 if (pSysMenu != NULL) X's-i!  
 { B!K{y>|.  
  CString strAboutMenu; .L0pS.=LT  
  strAboutMenu.LoadString(IDS_ABOUTBOX); hun L V8z  
  if (!strAboutMenu.IsEmpty()) %f\ M61Z  
  { UB@>i3  
   pSysMenu->AppendMenu(MF_SEPARATOR); /7De .O~H  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); wh l)^D  
  } g><u (3  
 } j0L9Q|s  
 SetIcon(m_hIcon, TRUE); // Set big icon xojy[c#  
 SetIcon(m_hIcon, FALSE); // Set small icon 1b+ B  
 m_Key.SetCurSel(0); 6cp x1y]~6  
 RegisterHotkey(); y4$UPLm  
 CMenu* pMenu=GetSystemMenu(FALSE); &STgj|t_  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 6Ii2rEzD  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +?zyFb]Km  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); j 9XY%4.  
 return TRUE; // return TRUE unless you set the focus to a control <~!7?ak  
} cpz}!D  
PQ.xmg2  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) a"&@G=M@d  
{ ,Ej2]iO\7  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 9-eYCg7C|  
 { 8K*X]Z h  
  CAboutDlg dlgAbout; BoG/Hd.S  
  dlgAbout.DoModal(); us\@n"  
 } MI0'ou8l  
 else :T" !6;  
 { 17tph;  
  CDialog::OnSysCommand(nID, lParam); )TJz'J\*  
 } S&}7jRH1  
} {6^c3R[  
Q4{%)}2$  
void CCaptureDlg::OnPaint() aDb@u3X@  
{ 9~I\WjB "  
 if (IsIconic()) 8)ZWR3)+W  
 { 90|p]I%  
  CPaintDC dc(this); // device context for painting L7_(KCh  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); n9]^v-]K  
  // Center icon in client rectangle F\Q)l+c  
  int cxIcon = GetSystemMetrics(SM_CXICON); 3hab51J  
  int cyIcon = GetSystemMetrics(SM_CYICON); x=Qy{eIe  
  CRect rect; 8jd<|nYnfc  
  GetClientRect(&rect); U2 <*BRJ  
  int x = (rect.Width() - cxIcon + 1) / 2; ,w; ~R4x  
  int y = (rect.Height() - cyIcon + 1) / 2; A@bWlwfl  
  // Draw the icon TC?kuQI  
  dc.DrawIcon(x, y, m_hIcon); yc|C}oQF  
 } 7Gnslp?[U  
 else gP/[=:  
 { <Q/^[  
  CDialog::OnPaint(); t1b$,jHmKl  
 } |Yh-`~~A"  
} 3H%R`ha  
g9}u6q  
HCURSOR CCaptureDlg::OnQueryDragIcon() *yKsgH  
{ >aW|W!.  
 return (HCURSOR) m_hIcon; %eT4Q~}5"  
} ^c83_93)R  
`IOp*8  
void CCaptureDlg::OnCancel() $_k'!/5  
{ <*0MD6 $5  
 if(bTray) %1gJOV  
  DeleteIcon(); Fx4C]S  
  CDialog::OnCancel(); s=(~/p#M  
} |xZDc6HDW  
`]\4yTd  
void CCaptureDlg::OnAbout() RKdf1C  
{ (aVs p*E  
 CAboutDlg dlg; kF3 EJ  
 dlg.DoModal(); s#`%c({U|  
} Y:&1;`FBZ  
JmrQDO_(  
void CCaptureDlg::OnBrowse() M$1+,[^f  
{ T~s/@*y9  
 CString str;  4D"IAI  
 BROWSEINFO bi; vNL f)B  
 char name[MAX_PATH]; [?RLvhU|  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); SOb17:o3|  
 bi.hwndOwner=GetSafeHwnd(); cNw<k&w6F  
 bi.pszDisplayName=name; 2]eh[fRQ  
 bi.lpszTitle="Select folder"; /4#.qq0\{c  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; }1TfKS]m>  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); CWE jX-  
 if(idl==NULL) 'Vy$d<@s[  
  return; JnhHV(H  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); DG8$zl5  
 str.ReleaseBuffer(); 3 C=nC  
 m_Path=str; TcZ Ci^1F  
 if(str.GetAt(str.GetLength()-1)!='\\') 9V?MJZ@aG  
  m_Path+="\\"; ijr*_=  
 UpdateData(FALSE); yZxgUF&`  
} T=VVK6Lc:  
.}ohnnJB0  
void CCaptureDlg::SaveBmp() p!' "hx  
{ HGWwGd  
 CDC dc; zVxiCyU  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); #Vv*2Mc  
 CBitmap bm; 1)#<nk)I  
 int Width=GetSystemMetrics(SM_CXSCREEN); BRQ9kK20  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5Ag]1k{  
 bm.CreateCompatibleBitmap(&dc,Width,Height); $7TYix8=  
 CDC tdc; .{7?Y;_(  
 tdc.CreateCompatibleDC(&dc); ~#I1!y~`  
 CBitmap*pOld=tdc.SelectObject(&bm); (oq(-Wv  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); CEYHD?9k8  
 tdc.SelectObject(pOld); L$ ]D&f8:  
 BITMAP btm; "uGJ\  
 bm.GetBitmap(&btm); BRoi`.b:  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; }-zx4<4BH  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); yu#Jw  
 BITMAPINFOHEADER bih; &_" 3~:N8k  
 bih.biBitCount=btm.bmBitsPixel; k49CS*I  
 bih.biClrImportant=0; n9bX[+#d  
 bih.biClrUsed=0; FX}<F0([?  
 bih.biCompression=0; jt3s;U*  
 bih.biHeight=btm.bmHeight; 4DuZF -y  
 bih.biPlanes=1; SjlkKulMF  
 bih.biSize=sizeof(BITMAPINFOHEADER); KT?vs5jg$&  
 bih.biSizeImage=size; 4$IPz7  
 bih.biWidth=btm.bmWidth; 2(\>PN-  
 bih.biXPelsPerMeter=0; )KXLL;]  
 bih.biYPelsPerMeter=0; <+_OgF1G  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); jXZKR(L  
 static int filecount=0; r+m8#uR  
 CString name; WNm,r>6m  
 name.Format("pict%04d.bmp",filecount++); O(&EnNm[2  
 name=m_Path+name; ]d$)G4X 1  
 BITMAPFILEHEADER bfh; 7:x.08  
 bfh.bfReserved1=bfh.bfReserved2=0; LYWQqxB  
 bfh.bfType=((WORD)('M'<< 8)|'B'); v#-%_V>ph  
 bfh.bfSize=54+size; =b`>ggw#  
 bfh.bfOffBits=54; 'd(}bYr)  
 CFile bf; ]NTHit^EX  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ f$2lq4P{  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); DKK200j  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); c?q#?K aF  
  bf.WriteHuge(lpData,size); >IoOCQQ*  
  bf.Close(); 3D<P [.bS  
  nCount++; F<'g6 f  
 } X+&@$v1  
 GlobalFreePtr(lpData); jS R:ltd  
 if(nCount==1) s)]|zu0"Ku  
  m_Number.Format("%d picture captured.",nCount); -MB ,]m  
 else s?0r\cc|:  
  m_Number.Format("%d pictures captured.",nCount); uO"@YX/  
  UpdateData(FALSE); dr9I+c7u  
} )}paQmy#  
bzUc;&WDz  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) i&_sbQ^  
{ "}PmAr e  
 if(pMsg -> message == WM_KEYDOWN) c?IIaj !  
 { _ZR2?y-M  
  if(pMsg -> wParam == VK_ESCAPE) Q|pz].0  
   return TRUE; (%I`EAR  
  if(pMsg -> wParam == VK_RETURN) (/qY*?  
   return TRUE; BJW;A>@Pj  
 } t`F%$q  
 return CDialog::PreTranslateMessage(pMsg); WBC'~h<@  
} C}+(L3Z  
4[Oy3.-c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3!Bekn]  
{ ky!'.3yoI  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ m4 4aK qw)  
  SaveBmp(); \UNw43EL  
  return FALSE; 0 'L+9T5  
} !sR`]0  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ { 0Leua  
 CMenu pop; M%$zor  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 66z1_ lA  
 CMenu*pMenu=pop.GetSubMenu(0); :T'"%_d5  
 pMenu->SetDefaultItem(ID_EXITICON); 6J&L5E  
 CPoint pt; yq;gBIiZ  
 GetCursorPos(&pt); ,&l>^w/  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); uV%7|/fD  
 if(id==ID_EXITICON) /B1NcRS  
  DeleteIcon(); M4')gG;  
 else if(id==ID_EXIT) RJd55+h  
  OnCancel(); 4'X^YBm  
 return FALSE; tSQ>P -O  
} #kV= ;(lq  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); x:?1fvVR  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) (wbG0lu  
 AddIcon(); wcV~z:&^5  
 return res; 'f5,%e2#  
} }hl# e[$  
=_v_#;h&  
void CCaptureDlg::AddIcon() ^iTjr$hQ;  
{ Zkxt>%20~  
 NOTIFYICONDATA data; *+Q,b^N  
 data.cbSize=sizeof(NOTIFYICONDATA); U24?+/5D]  
 CString tip; h^[K= J  
 tip.LoadString(IDS_ICONTIP); 9Y-s],2V  
 data.hIcon=GetIcon(0); bh_i*DJ]  
 data.hWnd=GetSafeHwnd(); o1kLT@VCl  
 strcpy(data.szTip,tip); T_I"Tsv  
 data.uCallbackMessage=IDM_SHELL; rY($+O@a<  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; IURi90Ir  
 data.uID=98; )!M:=}."  
 Shell_NotifyIcon(NIM_ADD,&data); #PtV=Ee1  
 ShowWindow(SW_HIDE); v\f 41M7D  
 bTray=TRUE; 7G2TTa  
} X"'}1o  
i mJ{wF  
void CCaptureDlg::DeleteIcon() oIbd+6>f  
{ V&NOp  
 NOTIFYICONDATA data; 1 3  
 data.cbSize=sizeof(NOTIFYICONDATA); CXJ0N   
 data.hWnd=GetSafeHwnd(); )/f,.Z$  
 data.uID=98; +h[$\_y  
 Shell_NotifyIcon(NIM_DELETE,&data); )S>~h;  
 ShowWindow(SW_SHOW); gxL5%:@  
 SetForegroundWindow(); O2A Z|[*I  
 ShowWindow(SW_SHOWNORMAL); n_?<q{GW  
 bTray=FALSE; 2<Ub[R  
} iVnrv`k,  
[O(78n$$  
void CCaptureDlg::OnChange() >#c]rk:  
{ $Ne#F+M9x  
 RegisterHotkey(); 0nA17^W  
} N6yqA)z?;  
7kG>s9O  
BOOL CCaptureDlg::RegisterHotkey() k,b(MAiQ0  
{ UGr7,+N&w  
 UpdateData(); &*L:4By)]  
 UCHAR mask=0; CWt,cwFW  
 UCHAR key=0; ^K&& O {  
 if(m_bControl) o_os;  
  mask|=4; _Z5l Nu  
 if(m_bAlt) TZPWMCN4  
  mask|=2; C6O1ype  
 if(m_bShift) D='/-3f!F]  
  mask|=1; !^G+@~U  
  key=Key_Table[m_Key.GetCurSel()]; Q_LPLmM  
 if(bRegistered){ <;SMczR  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); }=7tGqfw  
  bRegistered=FALSE; $ShL^g@  
 } `%F.]|Y0  
 cMask=mask; 0qZ{:}`3  
 cKey=key; <E6]8SQE  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -twIF49  
 return bRegistered; fd*=`+P  
} ;STO!^9~  
_W tSZmW?  
  四、小结 )!p=0&z@{  
5K{(V^88F  
  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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