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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: Gkp< o  
  A0fFv+RN3  
  一、实现方法 $*kxTiG!7  
_>v<(7  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: fgBM_c&9T  
.VkbYK  
#pragma data_seg("shareddata") Dgx8\~(E'  
HHOOK hHook =NULL; //钩子句柄 jaa"~5TO8  
UINT nHookCount =0; //挂接的程序数目 2KQoy;  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 cZ<A0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 n_B"- n  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey La@ +>  
static int KeyCount =0; }sx_Yj  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 P(;?kg}0  
#pragma data_seg() VwEb7v,^0\  
-CRra EXf8  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 x ul]m*Z  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: r YF #^  
}=|!:kiE  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR qY >{cjo  
cKey,UCHAR cMask) ?_v{| YI=  
{ V13BB44  
 BOOL bAdded=FALSE; ** +e7k   
 for(int index=0;index<MAX_KEY;index++){ RGK8'i/X  
  if(hCallWnd[index]==0){ Q6XRsFc  
   hCallWnd[index]=hWnd; ^1wA:?uN}  
   HotKey[index]=cKey; r%e KFS  
   HotKeyMask[index]=cMask; [Tnsr(Z  
   bAdded=TRUE; kFQ8 y~>y}  
   KeyCount++; z Nl ,  
   break; jZ%TJ0(H  
  } \tRG1&{$%  
 } /[9t`  
 return bAdded; e5OsI Vtjr  
} sg8/#_S1i  
//删除热键 /"?HZ% W  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) oX4q`rt  
{ ~`D|IWMDq  
 BOOL bRemoved=FALSE; Gdg)9  
 for(int index=0;index<MAX_KEY;index++){ HXoX  
  if(hCallWnd[index]==hWnd){ b]7GmRekl  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ PC qZNBN  
    hCallWnd[index]=NULL; (D 9Su^:1  
    HotKey[index]=0; @rHK( 25+d  
    HotKeyMask[index]=0; YhRWz=l  
    bRemoved=TRUE; [y0O{,lI  
    KeyCount--; HBY.DCN[Z  
    break; 2QNNp:`6  
   } i@][rdhT  
  } o=RM-tR`v  
 } T2D<UhP  
 return bRemoved; w ~ dk#=  
} 2>\v*adG  
}/,HM9Ke  
6&!&\  
  DLL中的钩子函数如下: &*s0\ 8  
!bC+TYsU  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :aG#~-Q  
{ 5'Q|EIL  
 BOOL bProcessed=FALSE; .>(Q)"v  
 if(HC_ACTION==nCode) ]7Fs$y.  
 { NO] 3*  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 siTX_`0  
   switch(wParam) St<mDTi  
   {  .@"q$\  
    case VK_MENU: g!i45-n3gt  
     MaskBits&=~ALTBIT; <jS~ WI@  
     break; 5~.ZlGd  
    case VK_CONTROL: unJ R=~E  
     MaskBits&=~CTRLBIT; 0A:n0[V:]  
     break; fGv#s X  
    case VK_SHIFT: q\rC5gk >  
     MaskBits&=~SHIFTBIT; #XnPsU<J  
     break; $o+5/c?|  
    default: //judge the key and send message 2Sq_Tw3^  
     break; j Y6MjZI  
   } cD4 kC>P*  
   for(int index=0;index<MAX_KEY;index++){ TM8 =U-A  
    if(hCallWnd[index]==NULL) huudBc A[  
     continue; &vovA} F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [DHoGy,P  
    { p7ir*r/2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); KI]wm  
     bProcessed=TRUE; yIb,,!y9{  
    } \]9.zlB  
   } @R m-CWa  
  } D{v8q)5r  
  else if((lParam&0xc000ffff)==1){ //有键按下 `p'Q7m2y/b  
   switch(wParam) cE iu)2*e  
   { SI_iI71  
    case VK_MENU: v_S4hz6w\  
     MaskBits|=ALTBIT; ez3Z3t`  
     break; fZKt%m  
    case VK_CONTROL: kGkA:g:  
     MaskBits|=CTRLBIT; ,&Wn [G<2  
     break; rtQHWRUn  
    case VK_SHIFT: 0Y]0!}  
     MaskBits|=SHIFTBIT; @FN*TJ  
     break; |BZDhd9<{  
    default: //judge the key and send message _28<m JfG  
     break; \tyg(srw0  
   } d/74{.  
   for(int index=0;index<MAX_KEY;index++){ O8U<{jgAG  
    if(hCallWnd[index]==NULL) ,uz ]V1  
     continue; B$?qQ|0:=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) XI Jlc~2  
    { Zs2-u^3&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); '<iK*[NW  
     bProcessed=TRUE; >\<*4J$PZ  
    } }]UB;id'  
   } CnN9!~]"  
  } E^hHH?w+  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 k#}g,0@  
   for(int index=0;index<MAX_KEY;index++){ fU2qrcVu  
    if(hCallWnd[index]==NULL) 2}vg U$a  
     continue; WqrgRpM{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) O;[9_[  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); dz#5q-r  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ZiFooA  
   } JM.XH7k  
  } Oq(VvS/  
 } he+#Q 6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (IbW; bV  
} [O ",  
9^F2$+T[:  
  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: 8 iC:xcN3  
D~K;~nI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ap\AP{S4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s|bM%!$1  
(/ " &  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ?v}Bd!'+P  
*oI*-C  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Vy G4(X va  
{ Z< b"`ty.  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) \nrP$  
 { Q}A=jew  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 aaWJ* >rJ  
  SaveBmp(); UFn8kBk  
  return FALSE; M~6@20$oW  
 } ! o, 5h|\  
 …… //其它处理及默认处理 ]r]k-GZ$  
} (y4#.vZh:  
o=fgin/E\  
;%q39U}  
  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。 ^a9 oKI9n  
^ons:$0h  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 R@T6U:1  
2 4\g bv<  
  二、编程步骤 [IM%b~j(^  
"L& k)J  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; g+zJ?  
u3tZ[Y2 c  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; (9fdljl],:  
'3l$al:H^  
  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; 3mt%!}S  
6\d X  
  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; )E7 FA|  
T9y;OG  
  5、 添加代码,编译运行程序。 zjX7C~h^Q  
^ DAa%u  
三、程序代码 ~KIDv;HSb[  
+zOOdSFk.  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL z xZtz  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) q<=: >?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Xwu.AVsr  
#if _MSC_VER > 1000 {6vEEU  
#pragma once >N`6;gn*l  
#endif // _MSC_VER > 1000 W,hWOO  
#ifndef __AFXWIN_H__ IvBGpT"(I  
#error include 'stdafx.h' before including this file for PCH *8g<R  
#endif ]Nk!4"  
#include "resource.h" // main symbols {gy+3  
class CHookApp : public CWinApp q{4|Kpx@  
{ (hZ:X)E>  
 public: +`| *s3M  
  CHookApp(); :9d\Uj,  
  // Overrides ZKbDp~  
  // ClassWizard generated virtual function overrides Db03Nk>#  
  //{{AFX_VIRTUAL(CHookApp) \ a-CN>  
 public: Fq,N  
  virtual BOOL InitInstance(); ddpl Pzm#  
  virtual int ExitInstance(); |DG@ht  
  //}}AFX_VIRTUAL ]gd/}m)1  
  //{{AFX_MSG(CHookApp) '?/&n8J\  
  // NOTE - the ClassWizard will add and remove member functions here. ~\_T5/I%  
  // DO NOT EDIT what you see in these blocks of generated code ! 6517Km 4-  
  //}}AFX_MSG M?6;|-HH  
  DECLARE_MESSAGE_MAP() s^|\9%WD  
}; D,W\ gP/h%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); hFb fNB3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w{7 ji}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H*!5e0~rR  
BOOL InitHotkey(); N7.  @FK  
BOOL UnInit(); X.J  
#endif /#q")4Mf  
/(6zsq'v|  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. f~gSJ< t4  
#include "stdafx.h" Z$2L~j"=!  
#include "hook.h" w6,*9(;$Pk  
#include <windowsx.h> 6&!l'[hU  
#ifdef _DEBUG *%- ?54B  
#define new DEBUG_NEW @&R1wr1>I5  
#undef THIS_FILE 1i?=JAFfM  
static char THIS_FILE[] = __FILE__; m4**>!I  
#endif O2#S: ~h  
#define MAX_KEY 100 D zDj)7  
#define CTRLBIT 0x04 U~QMR-bz  
#define ALTBIT 0x02 23E 0~O  
#define SHIFTBIT 0x01 @W9H9 PWv&  
#pragma data_seg("shareddata") i!~>\r\6\  
HHOOK hHook =NULL; lCFU1 GHH  
UINT nHookCount =0; _nX%#/{  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Wvr+y!F  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT $pu3Ig$^  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 4]BJ0+|mT  
static int KeyCount =0; F3 f@9@b   
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift p?Sl}A@`  
#pragma data_seg() T Oy7?;|=  
HINSTANCE hins; E%*AXkJ'dZ  
void VerifyWindow(); dq 8+m(7k  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 6F5,3&  
//{{AFX_MSG_MAP(CHookApp) /?3:X *  
// NOTE - the ClassWizard will add and remove mapping macros here. k:0P+d  
// DO NOT EDIT what you see in these blocks of generated code! 5EhE`k4  
//}}AFX_MSG_MAP BMjfqX  
END_MESSAGE_MAP() m`9^.>]P  
xii$e  
CHookApp::CHookApp() 0eA5zFU7  
{ |!b9b(_j9  
 // TODO: add construction code here, {})y^L  
 // Place all significant initialization in InitInstance IQ{?_'  
} UX}*X`{  
8eww7k^R  
CHookApp theApp; =HPu {K$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) a/e\vwHLv  
{ Y +qus  
 BOOL bProcessed=FALSE; qc-C>Ra  
 if(HC_ACTION==nCode) 6UB6;-  
 { Tf l;7w.(A  
  if((lParam&0xc0000000)==0xc0000000){// Key up B!`\L!  
   switch(wParam) 3/tJDb5  
   { @zs1>\J7  
    case VK_MENU: %c0z)R~  
     MaskBits&=~ALTBIT; 2?1}ZXr  
     break; w a.f![  
    case VK_CONTROL: Ki 3_N*z  
     MaskBits&=~CTRLBIT; (w2(qT&O  
     break; > ZDC . ~  
    case VK_SHIFT: q] ZSj J  
     MaskBits&=~SHIFTBIT; s"rg_FoL  
     break; ?z"YC&Tp  
    default: //judge the key and send message K{FhT9R'  
     break; Y UZKle  
   } Qdm(q:w  
   for(int index=0;index<MAX_KEY;index++){ lVT&+r~r  
    if(hCallWnd[index]==NULL) ^je528%H  
     continue; KL~AzLI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -7 L  
    { !&0a<~ Wi  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )8]3kQffJ=  
     bProcessed=TRUE; C,='3^Nc  
    } [iXi\Ex  
   } LH.%\TMN$  
  } i0i`k^bA  
  else if((lParam&0xc000ffff)==1){ //Key down .' IeHh  
   switch(wParam) JP_kQ  
   { q-uLA&4  
    case VK_MENU: M%;"c?g  
     MaskBits|=ALTBIT; TRCI\  
     break; F#^L9  
    case VK_CONTROL: Bpas[2gYC  
     MaskBits|=CTRLBIT; +yIL[D  
     break; -PXoMZx%  
    case VK_SHIFT: .SBc5KX  
     MaskBits|=SHIFTBIT; jRwa0Px(  
     break; m/" J s  
    default: //judge the key and send message \3: L Nt  
     break; ?GfxBZWJ  
   } s!i:0}U  
   for(int index=0;index<MAX_KEY;index++) 2i"HqAB  
   { {)uU6z {'  
    if(hCallWnd[index]==NULL) i)8gCDc  
     continue; #\0TxG5'QA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -Fa98nV.WB  
    { $&Ac5Zo%}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +qZc} 7rJF  
     bProcessed=TRUE; 1zR/HT  
    } $BaK'7=3*  
   } g X8**g'  
  } `_ 0)kdu  
  if(!bProcessed){ YjL t&D:IZ  
   for(int index=0;index<MAX_KEY;index++){ W`5a:"Vg  
    if(hCallWnd[index]==NULL) [Q=4P*G}X  
     continue; m"q/,}DR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z2ds8-z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); OU6^+Ta  
   } 2\ ,e  
  } AO^]>/7ed  
 } oM2|]ew)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); c0SX]4} G  
} M!-q}5';  
"s> >V,  
BOOL InitHotkey() O68bzi]  
{ Slo9#26  
 if(hHook!=NULL){ )L|C'dJ<k`  
  nHookCount++; +!G4tA$g  
  return TRUE; p ^](3Vi(  
 } mUiOD$rO  
 else `fLfT'  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); S>(z\`1qm  
  if(hHook!=NULL) -#daBx ?  
   nHookCount++; {dDq*sLf  
  return (hHook!=NULL); 22PGWSQ  
} M;V&KG Z  
BOOL UnInit() #Af)n(  
{ i{P%{hVb  
 if(nHookCount>1){ kO jEY  
  nHookCount--; [:Xn6)qz  
  return TRUE; va@XbUC  
 } ?${V{=)*X'  
 BOOL unhooked = UnhookWindowsHookEx(hHook); TdNsyr}JG  
 if(unhooked==TRUE){ x{~_/;\p3  
  nHookCount=0; fHLFeSfH  
  hHook=NULL; >2nF"?"=  
 } 7Onk!NH  
 return unhooked; 4Sqvhz  
} \I:UC %  
P`z7@9*j  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) M&eQ=vew.  
{ *1i?6$[ "  
 BOOL bAdded=FALSE; hJ<:-u+yk}  
 for(int index=0;index<MAX_KEY;index++){ R !jhwY$  
  if(hCallWnd[index]==0){ l'W3=,G[?  
   hCallWnd[index]=hWnd; k:`a+LiZ  
   HotKey[index]=cKey; 8u/3?Kc  
   HotKeyMask[index]=cMask; LPb]mC6#  
   bAdded=TRUE; #&}%70R)  
   KeyCount++; >s44  
   break; Io2,% !D  
  } 8TUF w@H%  
 } i'U,S`L6>  
 return bAdded; ;g&7*1E  
} zI1(F67d`  
G,+xT}@wu  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) FYxUOO  
{ b8eDD+ulk  
 BOOL bRemoved=FALSE; gQu\[e%mVo  
 for(int index=0;index<MAX_KEY;index++){ eB)UXOu1  
  if(hCallWnd[index]==hWnd){ nR(#F9  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ mi*:S%;h  
    hCallWnd[index]=NULL; XSD"/_xD  
    HotKey[index]=0; Fp wlV}:  
    HotKeyMask[index]=0; [SKP|`I>I  
    bRemoved=TRUE; jM{qRfOrg  
    KeyCount--; \MfR #k0  
    break; |:~("rA+v  
   } *QMF <ze  
  } f S(^["*G  
 } 6'S5sRA  
 return bRemoved; \ x3^  
} =ltbSf7  
TXA. 6e  
void VerifyWindow() GjG{qR  
{ c& 9+/JYMo  
 for(int i=0;i<MAX_KEY;i++){ [3Wsc`Q  
  if(hCallWnd!=NULL){ rOs)B21/  
   if(!IsWindow(hCallWnd)){ u?F7 L8q]  
    hCallWnd=NULL; B.h0" vJ  
    HotKey=0; mvUVy1-c  
    HotKeyMask=0; @hE7r-}]  
    KeyCount--; kxcgOjrmI  
   } E!:.G+SEl  
  } #-l!`\@  
 } `HE>%=]b  
} jB}_Slh1j  
.%-6&%1  
BOOL CHookApp::InitInstance() Tb>IHoil  
{ 8:;u v7p  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); k#{lt-a/  
 hins=AfxGetInstanceHandle(); 9\\@I =;  
 InitHotkey(); ~ nLkn#Z  
 return CWinApp::InitInstance(); 8 /:X& &  
} J"m%q\'  
{s9y@c*15.  
int CHookApp::ExitInstance() : OS mr  
{ Dx9$H++6$X  
 VerifyWindow(); | 7t=\  
 UnInit(); Fm-q=3  
 return CWinApp::ExitInstance(); Sn{aHH  
} n_e}>1_  
u* #-7   
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file GQEI f$  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) A>rWGo.{E  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ RZcx4fL}x  
#if _MSC_VER > 1000 RPa?Nv?e  
#pragma once Z&?+&q r^  
#endif // _MSC_VER > 1000 ]%vGC^  
.j'@K+<45  
class CCaptureDlg : public CDialog Z<$E.##  
{ 8`R +y  
 // Construction 6KBzlj0T+  
 public: N,'[:{GOY  
  BOOL bTray; r7]?g~zb  
  BOOL bRegistered; mjkw&2  
  BOOL RegisterHotkey(); 3Vb=6-|  
  UCHAR cKey; LOyCx/n  
  UCHAR cMask; r1^m#!=B  
  void DeleteIcon(); 5bGjO&$l  
  void AddIcon(); J?|K#<%  
  UINT nCount; yhJA;&}>  
  void SaveBmp(); *Bb|N--jI  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor dA_V:HP  
  // Dialog Data \E ? iw.}  
  //{{AFX_DATA(CCaptureDlg) C7XS6Nqu  
  enum { IDD = IDD_CAPTURE_DIALOG }; !#_h2a  
  CComboBox m_Key; o|p;6  
  BOOL m_bControl; ,YAPCj  
  BOOL m_bAlt; d~P<M3#>  
  BOOL m_bShift; i_jax)m%  
  CString m_Path; #NVF\  
  CString m_Number; =:v><  
  //}}AFX_DATA VDb,$i.Z0  
  // ClassWizard generated virtual function overrides 8VAYIxRv  
  //{{AFX_VIRTUAL(CCaptureDlg) 6B!j(R  
 public: 6x (L&>F  
  virtual BOOL PreTranslateMessage(MSG* pMsg); buxI-wv  
 protected: %O4}i@Fe  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /w}B07.  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); D=q;+,Pc  
  //}}AFX_VIRTUAL O[5_ 9W 4  
  // Implementation d-#u/{jG)  
 protected: #*7/05)  
  HICON m_hIcon; FJwZo}<6E  
  // Generated message map functions 8-y: ==C  
  //{{AFX_MSG(CCaptureDlg) %FR^[H]  
  virtual BOOL OnInitDialog(); XeIUdg4>R  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); h.}t${1ZC  
  afx_msg void OnPaint(); !txELA~24  
  afx_msg HCURSOR OnQueryDragIcon(); + 8K1]'t$  
  virtual void OnCancel(); ac+k 5K+  
  afx_msg void OnAbout(); I[cV"BDa  
  afx_msg void OnBrowse(); nDoiG#N0  
  afx_msg void OnChange(); HqnKpZ  
 //}}AFX_MSG F`ZIc7(.{  
 DECLARE_MESSAGE_MAP() zvK5Zxl  
}; 8KL_PwRX_f  
#endif $ <>EwW  
Fv7%TK{oe  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 44fq1<.K  
#include "stdafx.h" _:fO)gs|1  
#include "Capture.h" D-b2E6 o6  
#include "CaptureDlg.h" GJ^]ER-K  
#include <windowsx.h> hB GGs  
#pragma comment(lib,"hook.lib") *n|0\V<  
#ifdef _DEBUG tci%=3,)  
#define new DEBUG_NEW HC;I0&v>  
#undef THIS_FILE kT } '"  
static char THIS_FILE[] = __FILE__; jhEg#Q$  
#endif Jq+$_Uqd  
#define IDM_SHELL WM_USER+1 &Lt$a_y>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Rm\ '];  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5?~[|iPv  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; x[O#(^q  
class CAboutDlg : public CDialog :z0>H5  
{ r~D~7MNl  
 public: ;MRC~F=  
  CAboutDlg(); ;~gd<KK  
  // Dialog Data cf[u%{ 6Y  
  //{{AFX_DATA(CAboutDlg) $ DZQdhv  
  enum { IDD = IDD_ABOUTBOX }; 1N$gE  
  //}}AFX_DATA ]Re~V{uh  
  // ClassWizard generated virtual function overrides sG1]A:_<C  
  //{{AFX_VIRTUAL(CAboutDlg) t+4Y3*WeGF  
 protected: (HrkUkw  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support N5rG.6K  
  //}}AFX_VIRTUAL i\Q"a B"r  
  // Implementation c] >&6-;rf  
 protected: &6^W% r  
  //{{AFX_MSG(CAboutDlg) :2UC{_  
  //}}AFX_MSG b-(UsY:  
  DECLARE_MESSAGE_MAP() :kiO  
}; 64 \5v?C  
:@@A  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1-NX>E5  
{ D>7_P7]y  
 //{{AFX_DATA_INIT(CAboutDlg) l;Wy,?p  
 //}}AFX_DATA_INIT ,<P[CUD&&  
} *A1TDc$  
}jY[| >z  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) cVHE}0Xd(  
{ %}ApO{  
 CDialog::DoDataExchange(pDX); EAd:`X,Y  
 //{{AFX_DATA_MAP(CAboutDlg) =Z>V}`n  
 //}}AFX_DATA_MAP -ynLuq#1A  
} ]-5jgz"  
2eR+dT  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0-~6} r$  
 //{{AFX_MSG_MAP(CAboutDlg) o? O,nD 6  
 // No message handlers ^B!?;\4IM  
 //}}AFX_MSG_MAP C8W`Oly:]  
END_MESSAGE_MAP() AIxBZt7{b  
gUszMhHX  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) \Af|$9boHz  
: CDialog(CCaptureDlg::IDD, pParent) On.x~ t  
{ xE-c9AH  
 //{{AFX_DATA_INIT(CCaptureDlg) `w=H'"Zv  
  m_bControl = FALSE; dK;\`>8  
  m_bAlt = FALSE; jme5'FR  
  m_bShift = FALSE; 3 cW"VrFy9  
  m_Path = _T("c:\\"); g\{! 21M  
  m_Number = _T("0 picture captured."); Mm7n?kb6  
  nCount=0; %1?V6&  
  bRegistered=FALSE; kdMS"iN8x  
  bTray=FALSE; |o=\9:wV  
 //}}AFX_DATA_INIT !>2\OSp!  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 v{{2<,l  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); hYUV9k:  
} ~B*\k^t`  
vwH7/+  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) .q9|XDqQc  
{ $E,DxDT  
 CDialog::DoDataExchange(pDX); ic]tUOC:  
 //{{AFX_DATA_MAP(CCaptureDlg) :0j`yo:w  
  DDX_Control(pDX, IDC_KEY, m_Key); //5_E7Ehu$  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); w$;*~Qc  
  DDX_Check(pDX, IDC_ALT, m_bAlt); r=H\4%P4  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); :9 iOuu  
  DDX_Text(pDX, IDC_PATH, m_Path); Nx (pJp{S  
  DDX_Text(pDX, IDC_NUMBER, m_Number); $0S"Lh{  
 //}}AFX_DATA_MAP j _9<=Vu  
} >.wd)  
#M^Yh?~%w  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ;6 qdOD6  
//{{AFX_MSG_MAP(CCaptureDlg) *;yMD-=  
 ON_WM_SYSCOMMAND() o4 g  
 ON_WM_PAINT() PM<LR?PLc  
 ON_WM_QUERYDRAGICON() ApJf4D<V  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) v?TJ!o  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Ww tQ>'R"  
 ON_BN_CLICKED(ID_CHANGE, OnChange) XhD fI &  
//}}AFX_MSG_MAP *n_4Rr  
END_MESSAGE_MAP()  wY_-  
ZUJOBjb` K  
BOOL CCaptureDlg::OnInitDialog() c2mt<DtWW  
{ Ru')X{]25  
 CDialog::OnInitDialog(); )zt4'b\)v  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); RrpF i'R  
 ASSERT(IDM_ABOUTBOX < 0xF000); "sx&8H"  
 CMenu* pSysMenu = GetSystemMenu(FALSE); =egi?Ne  
 if (pSysMenu != NULL) k\<Ln w  
 { N b[o6AX  
  CString strAboutMenu; ~rX6owBq  
  strAboutMenu.LoadString(IDS_ABOUTBOX); %e<dV\x?T  
  if (!strAboutMenu.IsEmpty()) u\geD  
  { \ J:T]  
   pSysMenu->AppendMenu(MF_SEPARATOR); *=9#tYn~  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); }<h. chz,  
  } /P"\ +Qp  
 } :QL p`s  
 SetIcon(m_hIcon, TRUE); // Set big icon pvUoed\  
 SetIcon(m_hIcon, FALSE); // Set small icon :Sn3|`HDm  
 m_Key.SetCurSel(0); FY S83uq0  
 RegisterHotkey(); Bg0cC  
 CMenu* pMenu=GetSystemMenu(FALSE); _";pk  _  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;/q6^Nk3A  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); vl~   
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); `srZ#F5  
 return TRUE; // return TRUE unless you set the focus to a control .) ;:K  
} O:p649A  
AX RNV  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) }/r%~cZ  
{ U*:'/.  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) eniR}  
 { AR6vc  
  CAboutDlg dlgAbout; p}7&x[fTLk  
  dlgAbout.DoModal(); P}QbxkS 8  
 } 9ufs6 z  
 else h:sG23@=  
 { r K)  
  CDialog::OnSysCommand(nID, lParam); []!r|R3  
 } YY~=h5$  
} 32P]0&_O  
&*GX:0=/>  
void CCaptureDlg::OnPaint() 5w{pX1z1  
{  A;x^6>  
 if (IsIconic()) =T4 w:  
 { s;WCz  
  CPaintDC dc(this); // device context for painting ucPMT0k  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); &it/@8yH  
  // Center icon in client rectangle (+ anTA=  
  int cxIcon = GetSystemMetrics(SM_CXICON); :Rj,'uH+h)  
  int cyIcon = GetSystemMetrics(SM_CYICON); {leG~[d  
  CRect rect; aBi:S3 qk  
  GetClientRect(&rect); J}\]<aC  
  int x = (rect.Width() - cxIcon + 1) / 2; 4F6o  
  int y = (rect.Height() - cyIcon + 1) / 2; /-4B)mL  
  // Draw the icon %\&dFwb  
  dc.DrawIcon(x, y, m_hIcon); t+J6P)=  
 } Wj=ex3K3u.  
 else rXPx* /C  
 { VVl-cU  
  CDialog::OnPaint(); NWK_(=n  
 } ,x.)L=Cx8  
} A_|FsQ6$P  
ta., 4R&K  
HCURSOR CCaptureDlg::OnQueryDragIcon()  F]#fl%  
{ gSYX@'Q!  
 return (HCURSOR) m_hIcon; h18y?e7MU  
} }l!_m.#e  
0N;d)3  
void CCaptureDlg::OnCancel() i]?xM2(N  
{ 17MjIX  
 if(bTray) Qo *]l_UO;  
  DeleteIcon(); ACltV"dB^  
  CDialog::OnCancel(); }*R6p?L5  
} 7"i*J6y*  
a`Z f_;$@  
void CCaptureDlg::OnAbout() toJ&$HrE  
{ Pv.@Y 30  
 CAboutDlg dlg; ved Qwzh  
 dlg.DoModal(); 3y,?>-  
} mP[u[|]  
rNyK*Wjt  
void CCaptureDlg::OnBrowse()  U~t(YT  
{ cpnwx1q@  
 CString str; TeqsP1{?  
 BROWSEINFO bi; Q*(o;\s  
 char name[MAX_PATH]; ? d\8Q't*  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Ntiz-qW  
 bi.hwndOwner=GetSafeHwnd(); x)L@x Q  
 bi.pszDisplayName=name; IyP].g1"U  
 bi.lpszTitle="Select folder"; X&Lt?e,&  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; /Ql}jSKi  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); zUqDX{I8  
 if(idl==NULL) rSn7(3e4^  
  return; q8>Q,F`BA  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); |Wk G='02  
 str.ReleaseBuffer(); hGV/P94  
 m_Path=str; Q~_x%KN/`  
 if(str.GetAt(str.GetLength()-1)!='\\') 4/>={4Y9  
  m_Path+="\\"; lej{VcG  
 UpdateData(FALSE); 0{F.DDiNT  
} glgk>83I+  
3IFU{0a`  
void CCaptureDlg::SaveBmp() #mYxO  
{ p#2th`M:P1  
 CDC dc; Z- (HDn  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); P\e%8&_U/  
 CBitmap bm; >`'9V| 1  
 int Width=GetSystemMetrics(SM_CXSCREEN); a~>h'}C>  
 int Height=GetSystemMetrics(SM_CYSCREEN); : 6V 8  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Q>$L;1E*,  
 CDC tdc; ]EQ/*ct  
 tdc.CreateCompatibleDC(&dc); yk2j&}M  
 CBitmap*pOld=tdc.SelectObject(&bm); `l"~"x^Rr  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); {eUfwPAa3  
 tdc.SelectObject(pOld); D9 en  
 BITMAP btm; h[T3WE  
 bm.GetBitmap(&btm); e AjtWqg  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; T`sM4 VWqU  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9MxGyGz$  
 BITMAPINFOHEADER bih; hgGcUpJy?  
 bih.biBitCount=btm.bmBitsPixel; mGvP9E"&  
 bih.biClrImportant=0; vNGvEJ`qn  
 bih.biClrUsed=0; ( Iew%U  
 bih.biCompression=0; W:\VFP f2  
 bih.biHeight=btm.bmHeight; gzF&7trN  
 bih.biPlanes=1; .~J^`/o  
 bih.biSize=sizeof(BITMAPINFOHEADER); ^h=kJR9  
 bih.biSizeImage=size; h6/Z_ Y  
 bih.biWidth=btm.bmWidth; Lt_]3g o  
 bih.biXPelsPerMeter=0; l1WVt}  
 bih.biYPelsPerMeter=0; >kYyR.p.b  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Je,8{J|e  
 static int filecount=0; ;rgsPVbVf  
 CString name; *en{pR'  
 name.Format("pict%04d.bmp",filecount++); 9lv 2  
 name=m_Path+name; x}d\%* B  
 BITMAPFILEHEADER bfh; rej[G!  
 bfh.bfReserved1=bfh.bfReserved2=0; s8Oz^5p(  
 bfh.bfType=((WORD)('M'<< 8)|'B'); #SueT"F  
 bfh.bfSize=54+size; WM26-nR  
 bfh.bfOffBits=54; A_%w (7o"  
 CFile bf; k1J}9HNYR  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ / yCV-L2J  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 1zRO== b  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); M &J*I  
  bf.WriteHuge(lpData,size); ]mSVjF3l  
  bf.Close(); ?L^ Gu ]y  
  nCount++; {Hu0  
 } =%LS9e^7D  
 GlobalFreePtr(lpData); Gj=il-Po  
 if(nCount==1) f$|v  
  m_Number.Format("%d picture captured.",nCount); xh0!H| R  
 else uypD`%pC  
  m_Number.Format("%d pictures captured.",nCount); LKa_ofY  
  UpdateData(FALSE); P6Ei!t,>  
} x% 1Rp[  
M3%< kk-_  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 'mF}+v^   
{ ;G$FLL1   
 if(pMsg -> message == WM_KEYDOWN) yrw!b\  
 { #'qW?8d}  
  if(pMsg -> wParam == VK_ESCAPE) 1a<~Rmcil  
   return TRUE; 2 O%UT?R  
  if(pMsg -> wParam == VK_RETURN) 6k2~j j1d  
   return TRUE; b11C3TyQT  
 } *RPI$0  
 return CDialog::PreTranslateMessage(pMsg); \XC1/LZQ  
} *L=CJg  
v&Kw 3!X#E  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) eC?N>wHH  
{ /1*\*<cs  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ _N6GV$Q  
  SaveBmp(); ":OXs9Yg  
  return FALSE; SPBXI[[-  
} =B 9U  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ xQQ6D  
 CMenu pop; 0 !Yi.'+  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Xma0k3;-  
 CMenu*pMenu=pop.GetSubMenu(0); ;I>`!|mT  
 pMenu->SetDefaultItem(ID_EXITICON); mYCGGwD  
 CPoint pt; \ C Yu;  
 GetCursorPos(&pt); 4"{q|~&=:$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); JmkJ^-A 6  
 if(id==ID_EXITICON) d=[ .   
  DeleteIcon(); @ o]F~x  
 else if(id==ID_EXIT) c c:xT0Y  
  OnCancel(); ~1p f ?  
 return FALSE; Z,*VRuA  
} ; ?!sU  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); OX91b<A  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) nP.d5%E  
 AddIcon(); 3hkA`YSYt  
 return res; ]^!#0(  
} [30e>bSf`  
,Fb#%r%  
void CCaptureDlg::AddIcon() R0Qp*&AL  
{ q_!3<.sf  
 NOTIFYICONDATA data; >a,w8^7  
 data.cbSize=sizeof(NOTIFYICONDATA);  u!(|y9p  
 CString tip; |$Td-M^)  
 tip.LoadString(IDS_ICONTIP); yDPek*#^"q  
 data.hIcon=GetIcon(0); /)~M cP3  
 data.hWnd=GetSafeHwnd(); bz1\EkLL  
 strcpy(data.szTip,tip); bkb}M)C  
 data.uCallbackMessage=IDM_SHELL; uaiG (O   
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; PqfH}d0l  
 data.uID=98; ^pn:SV  
 Shell_NotifyIcon(NIM_ADD,&data); s:%>H|-  
 ShowWindow(SW_HIDE); NFQ0/iuW  
 bTray=TRUE; l 1@:&j3h  
} "YivjHa7H  
xaPTTa  
void CCaptureDlg::DeleteIcon() 1*XqwBV  
{ H]cCyuCdH  
 NOTIFYICONDATA data; ak%8|'}  
 data.cbSize=sizeof(NOTIFYICONDATA); Q,scjt[  
 data.hWnd=GetSafeHwnd(); k vb"n}  
 data.uID=98; ~! @a  
 Shell_NotifyIcon(NIM_DELETE,&data); W*P/~U=  
 ShowWindow(SW_SHOW); ,\VNs'j  
 SetForegroundWindow(); 3 Tt8#B  
 ShowWindow(SW_SHOWNORMAL); k7j;'6  
 bTray=FALSE; 56fcifXz@  
} Xs4`bbap  
-50|r;a  
void CCaptureDlg::OnChange() nF=h|rN  
{ co: W!  
 RegisterHotkey(); E5B:79BGO  
} W)KV"A3C  
8$1<N  
BOOL CCaptureDlg::RegisterHotkey() 8E D6C"6  
{ wuPx6hCl  
 UpdateData(); \5Hfe;ny-~  
 UCHAR mask=0; 'Ic$p>  
 UCHAR key=0; 'C(YUlT2?P  
 if(m_bControl) X4jtti  
  mask|=4; #U^@)g6  
 if(m_bAlt) Rt+s\MC^r  
  mask|=2; <=WQs2  
 if(m_bShift) )AnX[:y  
  mask|=1; F*QGzbv)  
  key=Key_Table[m_Key.GetCurSel()]; zH.7!jeE  
 if(bRegistered){ 0 j6/H?OT  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); "/K44(^  
  bRegistered=FALSE; zT.qNtU%  
 } U`xjau+  
 cMask=mask; >XB Lm`a  
 cKey=key; $cjidBi`):  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); zI&oZH^vn  
 return bRegistered; U\+o$mU^  
} 9mr99 tA  
}=NjFK_6  
  四、小结 lV3\5AEW  
8!1vsEqv  
  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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