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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: (Dl$kGn  
  s1NKLt  
  一、实现方法 Hx*;jpy(2  
tEKmy7'#  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: G) 7;;  
TbGn46!:  
#pragma data_seg("shareddata") Dg?70v <a  
HHOOK hHook =NULL; //钩子句柄 JB`\G=PiL  
UINT nHookCount =0; //挂接的程序数目 Q/_f zg  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 `-l6S  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 x+x40!+\  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey HO%wHiv1X  
static int KeyCount =0; \cUNsB5  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1  4/1d&Sg  
#pragma data_seg() R0vIbFwj  
5Z\#0":e  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ws|;  `  
L>%o[tS  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: e5B Qr$j  
m{uxI za  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR )3w@]5j  
cKey,UCHAR cMask) % !>I*H  
{ #+5pgD2C  
 BOOL bAdded=FALSE; aL%AQB,  
 for(int index=0;index<MAX_KEY;index++){ muZ~*kMc  
  if(hCallWnd[index]==0){ DRgTe&+  
   hCallWnd[index]=hWnd; ul2")HL];  
   HotKey[index]=cKey; &twf,8  
   HotKeyMask[index]=cMask; ayD}r#7  
   bAdded=TRUE; k |%B?\m  
   KeyCount++; }J1tdko#  
   break; .CU5}Tv-  
  } YmgLzGk`  
 } ?5 cI'  
 return bAdded; mvZw  
} J<maQ6p  
//删除热键 >U*T0FL7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?1$fJ3  
{ $UCAhG$  
 BOOL bRemoved=FALSE;  !@'6)/  
 for(int index=0;index<MAX_KEY;index++){ oMTf"0EIW  
  if(hCallWnd[index]==hWnd){ JJ'.((  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `~;rblo;  
    hCallWnd[index]=NULL; @reeO=  
    HotKey[index]=0; C@W"yYt  
    HotKeyMask[index]=0; aKuSd3E@#  
    bRemoved=TRUE; h{p=WWK  
    KeyCount--; >ByXB!Wi+  
    break; aZ'Lx:)R  
   } mB9r3[  
  } }S$@ Ez6  
 } BWuqo  
 return bRemoved; OYmR<x5y/  
} 4NG?_D5&  
ux3<l+jv^  
wG< (F}VX  
  DLL中的钩子函数如下: :!b'Vk  
`poE6\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) LLXVNO@e+  
{ P2'DD 3   
 BOOL bProcessed=FALSE; !0C^TCuG  
 if(HC_ACTION==nCode) sWblFvHqrU  
 { SD$h@p=!=  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 eI:C{0p=  
   switch(wParam) J6G(_(d  
   {  E7)= `kSl  
    case VK_MENU: _Bp1co85MQ  
     MaskBits&=~ALTBIT; .h5[Q/*h  
     break; .]7Qu;L  
    case VK_CONTROL: 09kt[  
     MaskBits&=~CTRLBIT; h!:~f-@j4  
     break; ]U7KLUY>:  
    case VK_SHIFT: (BfgwC)  
     MaskBits&=~SHIFTBIT; /2Bi@syxK  
     break; ?6jkI2w  
    default: //judge the key and send message 'hv k  
     break; qt^T6+faaQ  
   } ZMLg;-T.&4  
   for(int index=0;index<MAX_KEY;index++){ 3UQ;X**F  
    if(hCallWnd[index]==NULL) jSuL5|Gui  
     continue; cEd+MCN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9n5<]Q (  
    { Eb>78k(3I)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !G}+E2fDA  
     bProcessed=TRUE; Y.U[wL>  
    } T%n2$  
   } Xy &uZ  
  } V-r3-b  
  else if((lParam&0xc000ffff)==1){ //有键按下 #\ n8M  
   switch(wParam) 0#*#a13  
   { ] 0m&(9  
    case VK_MENU: 3lq Mucr  
     MaskBits|=ALTBIT; JA_BKA  
     break; 4bJZmUb  
    case VK_CONTROL: Mz;[+p  
     MaskBits|=CTRLBIT; ]B]*/  
     break; ]$\|ktY!  
    case VK_SHIFT: j$Je6zq0x  
     MaskBits|=SHIFTBIT; 4[-*~C|W5  
     break; p6XtTx  
    default: //judge the key and send message xvSuPP4 m  
     break; &gE 75B  
   } (?! ,p^  
   for(int index=0;index<MAX_KEY;index++){ "a/ Q%.P  
    if(hCallWnd[index]==NULL) u@%r  
     continue; BEgV^\u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :C8$Xi_i}  
    { ^T,Gu-2>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); H'UR8%  
     bProcessed=TRUE; T,OwM\`.X{  
    } -tI'3oT1  
   } fiN3xP]V  
  } d/e|'MPX  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 LJTQaItdqJ  
   for(int index=0;index<MAX_KEY;index++){ d{de6 `  
    if(hCallWnd[index]==NULL) 3#45m+D  
     continue; e=QK}gzX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) uH;-z_Wpn!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); D'hW|  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 D\YE^8/  
   } !GQ\"Ufs>  
  } vuFBET,  
 } |s)?cpb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2',w[I  
} BiZ=${y  
z|(+|pV(  
  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: ii0Ce}8d~  
wB{;bB{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /Y2/!mU</  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); F[!ckes<bB  
xN@Pz)yo  
  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: R1W}dRE}  
c$QX )V  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M}wXJ8aF?  
{ 5 VA(tzmCt  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) FHPXu59u  
 { !HJ$UG/\  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 )I-fU4?  
  SaveBmp(); 7 #=}:3c  
  return FALSE; A=-F,=k(!/  
 } DF{ Qw@P!  
 …… //其它处理及默认处理 6Ik,zQL  
} leiW4Fj  
N9rBW   
M8b4NF_&  
  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。 @v*/R%rv t  
5Fm=/o1  
  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。 |uH%6&\  
Px>va01n  
  二、编程步骤 `ZaT}# Y  
M#@aB"@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"; 35*\_9/#  
LN_OD5gZ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; WWZ9._  
VNtPKtx\  
  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; ,[nm_^R*\  
{3Vk p5%l  
  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; U\?g*  
g3%t8O/M  
  5、 添加代码,编译运行程序。 ro[Y-o5Q0  
l#wdpD a{  
三、程序代码 h !(>7/Gi  
zK+52jhi  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL OW(&s,|6x  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) <[/%{sUNC  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ozr9>b>M  
#if _MSC_VER > 1000 2`= 6%s  
#pragma once :;!\vfZbU  
#endif // _MSC_VER > 1000 #DkD!dW(l  
#ifndef __AFXWIN_H__ ;bX4(CMe &  
#error include 'stdafx.h' before including this file for PCH H2-28XGc  
#endif @l UlY2  
#include "resource.h" // main symbols te4= S  
class CHookApp : public CWinApp VRW] a  
{ Sb:T*N0gS  
 public: www`=)A;  
  CHookApp(); BXUF^Hj%  
  // Overrides mEuHl>  
  // ClassWizard generated virtual function overrides s2v(=  
  //{{AFX_VIRTUAL(CHookApp) yO>V/5`  
 public: 2PSTGG8JV  
  virtual BOOL InitInstance(); 7> Pgc  
  virtual int ExitInstance(); K$REZe  
  //}}AFX_VIRTUAL XL}<1- }  
  //{{AFX_MSG(CHookApp) L6i|:D32p  
  // NOTE - the ClassWizard will add and remove member functions here. %E27.$E_  
  // DO NOT EDIT what you see in these blocks of generated code ! ~-F?Mc  
  //}}AFX_MSG 6b Z[Kt  
  DECLARE_MESSAGE_MAP() 7=*VpX1  
}; | H ;+1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 7XyOB+aQO  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lg1PE7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); I 2HT2c$  
BOOL InitHotkey(); Cj;/Uhs  
BOOL UnInit(); r FL$QC2  
#endif UlQQP^Na  
.%0ne:5  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Z]:BYX'  
#include "stdafx.h" u&TdWZe  
#include "hook.h" $X+u={]  
#include <windowsx.h> pyW u9  
#ifdef _DEBUG =<<3Pkv7@  
#define new DEBUG_NEW e"+dTq8W  
#undef THIS_FILE hQgN9S5P  
static char THIS_FILE[] = __FILE__; S9Yt1qb  
#endif C/v}^#cLD  
#define MAX_KEY 100 |&hU=J o  
#define CTRLBIT 0x04 0D)`2W  
#define ALTBIT 0x02 Z]-WFU_ N  
#define SHIFTBIT 0x01 s!6=|SS7  
#pragma data_seg("shareddata") ]i8c\UV\  
HHOOK hHook =NULL; xT F=Y_  
UINT nHookCount =0; 04 y!\  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey CM~MoV[k7e  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT G"S5ki`o  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Kv+Bfh  
static int KeyCount =0; e4qj .b  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ibF#$&!  
#pragma data_seg() ]X" / yAn  
HINSTANCE hins; LBX%HGH  
void VerifyWindow(); Wtv#h~jy9  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) <uF [,  
//{{AFX_MSG_MAP(CHookApp) _qTpy)+  
// NOTE - the ClassWizard will add and remove mapping macros here. pX<a2F P  
// DO NOT EDIT what you see in these blocks of generated code! S>ugRasZ$  
//}}AFX_MSG_MAP Vf{2dZZ{1  
END_MESSAGE_MAP() Xi~9&ed#$i  
PX3  
CHookApp::CHookApp() h}=M^SL  
{ &P n]  
 // TODO: add construction code here, Z|`fHO3j  
 // Place all significant initialization in InitInstance =%h~/,  
} S]yvMj_?  
#Mi|IwL  
CHookApp theApp; {~GR8 U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) WaYO1*=  
{ FWTx&Ip  
 BOOL bProcessed=FALSE; 1| xN%27>  
 if(HC_ACTION==nCode) |ft:|/^F&  
 { 2;N@aZX  
  if((lParam&0xc0000000)==0xc0000000){// Key up d~[UXQC  
   switch(wParam) 9!t4>  
   { !O\X+#j  
    case VK_MENU: t>U!Zal"  
     MaskBits&=~ALTBIT; gEKO128  
     break; qB JRS'6'9  
    case VK_CONTROL: sA_X<>vAKJ  
     MaskBits&=~CTRLBIT; kQ}s/*  
     break; +?e}<#vd'?  
    case VK_SHIFT: )bYez  
     MaskBits&=~SHIFTBIT; H%Y%fQ ~^  
     break; dB`b9)Tk0z  
    default: //judge the key and send message IH3FK!>6  
     break; <-|SIF  
   } `)tK^[,<W  
   for(int index=0;index<MAX_KEY;index++){ 98<zCSe\]  
    if(hCallWnd[index]==NULL) VC=6uB  
     continue; `$9L^Yg,4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 31 ] 7z  
    { 4Vx+[8W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); uiK:*[  
     bProcessed=TRUE; !Y%D 9  
    } >0T3'/k<H  
   } fSV5  
  } h[l{ 5Z*  
  else if((lParam&0xc000ffff)==1){ //Key down *o|p)lH  
   switch(wParam) zH+<bEo=1=  
   { P|N?OocE  
    case VK_MENU: FR'b`Xv:  
     MaskBits|=ALTBIT; s, -*q}  
     break; EVSK8T,  
    case VK_CONTROL: |!5@xs*T  
     MaskBits|=CTRLBIT; 4qBY% 1  
     break; /.-m}0h|W-  
    case VK_SHIFT: aL$j/SC  
     MaskBits|=SHIFTBIT; B*Cb6'Q  
     break; fMB4xbpD  
    default: //judge the key and send message 6bJ"$o  
     break; O<a3DyUa;  
   } e3rfXhp  
   for(int index=0;index<MAX_KEY;index++) R1 qMg+  
   { AJWLEc4XK  
    if(hCallWnd[index]==NULL) Vw?P.4  
     continue; 36i_D6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]n1D1  
    { 7xR|_+%~K  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); t>@yv#  
     bProcessed=TRUE; D'?]yyrf  
    } G4"lZM  
   } 0nT%Slbih  
  } TA9dkYlE/  
  if(!bProcessed){ YUS?]~XC7x  
   for(int index=0;index<MAX_KEY;index++){ 165WO}(;/  
    if(hCallWnd[index]==NULL) s'AQUUrb <  
     continue; D`fc7m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Wbs^(iUU}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 9!S^^;PN&  
   } *lY+Yy(  
  } cqHw^{'8  
 } vK`S!7x'&  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); oP,RlR  
} DoTs9w|5  
4Qhx[Hv>(  
BOOL InitHotkey() aZC*7AK   
{ _3zU,qm+  
 if(hHook!=NULL){ /W``LK>;?  
  nHookCount++; }*OD M6  
  return TRUE; Z c<]^QR  
 } z}mvX .j7  
 else I &cX8Tw  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Cd9t{pQD4  
  if(hHook!=NULL) u-1@~Z  
   nHookCount++; n\ Gg6Y  
  return (hHook!=NULL); eFes+i(35  
} 5GUH;o1m  
BOOL UnInit() o8mo=V4j  
{ $;ch82UiX  
 if(nHookCount>1){ HWOek"}Z[  
  nHookCount--; kEx8+2s=M  
  return TRUE; \c FAxL(  
 } i~ROQMN1  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $TFTIk*uU  
 if(unhooked==TRUE){ lWIv(%/@  
  nHookCount=0; @#1cx  
  hHook=NULL; r8<JX5zyuo  
 } {Wr\D Vp  
 return unhooked; dY 6B%V  
} B_b8r7Vn`  
d[yrNB6|  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) r \9:<i8  
{ cy9N:MR(c  
 BOOL bAdded=FALSE; cyDiA(ot&  
 for(int index=0;index<MAX_KEY;index++){ ~S! L!qY  
  if(hCallWnd[index]==0){ -aA<.+  
   hCallWnd[index]=hWnd; my=*zziN  
   HotKey[index]=cKey; ?! _u,sT  
   HotKeyMask[index]=cMask; YlG; A\]k  
   bAdded=TRUE; nO-d" S*  
   KeyCount++; rkbl/py  
   break; G) jG!`I  
  } [6oq##  
 } IBzHR[#,^  
 return bAdded; O5c_\yv=  
} EP/&m|o|G  
5wy;8a  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Bfu/9ad  
{ ![qRoYpbg8  
 BOOL bRemoved=FALSE; fdg[{T4:  
 for(int index=0;index<MAX_KEY;index++){ XlE$.  
  if(hCallWnd[index]==hWnd){ osI- o~#>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ jg7d7{{SB  
    hCallWnd[index]=NULL; aYqqq|  
    HotKey[index]=0; 4p*?7g_WVH  
    HotKeyMask[index]=0; (}VuiNY<3  
    bRemoved=TRUE; iM4mkCdOO  
    KeyCount--; `>dIF.  
    break; A!n~8zcmp}  
   } X9p+a,  
  } LqMe'z  
 } 7 _X&5ni  
 return bRemoved; #tCIuQ,  
} e OO!jrT:  
C+}CU}  
void VerifyWindow() zUvB0\{q  
{ i%#th'C!P  
 for(int i=0;i<MAX_KEY;i++){ 5R$=^gE  
  if(hCallWnd!=NULL){ :Fw *r|  
   if(!IsWindow(hCallWnd)){ ,P;8 }yQ  
    hCallWnd=NULL; %?U"[F1  
    HotKey=0; =]8f"wAh*  
    HotKeyMask=0; fp`U?S6  
    KeyCount--; c-? Ygr  
   } 1x^W'n,HtK  
  } 7 3H@kf  
 } dO Y lI`4  
} E!r4AjaC  
ddGkk@CA  
BOOL CHookApp::InitInstance() O8!!UA8V  
{ l#mqV@?A~  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); JDIz28Ww  
 hins=AfxGetInstanceHandle(); VGq{y{(  
 InitHotkey(); zS&7[:IRs'  
 return CWinApp::InitInstance(); =>E44v  
} (or =f`  
qpH j4  
int CHookApp::ExitInstance() /&y,vkZTT  
{ @^w!% ?J  
 VerifyWindow(); Pcd i  
 UnInit(); 8^&fZL',  
 return CWinApp::ExitInstance(); ! hOOpZ f7  
} wWp?HDl"M  
RlG'|xaT  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file m-Mhf;  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) PX+"" #  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ s?1-$|*  
#if _MSC_VER > 1000 iPRJA{$b_  
#pragma once ]9!Gg  
#endif // _MSC_VER > 1000 G <}7vF  
XRX7qo(0g  
class CCaptureDlg : public CDialog ?S;et2f  
{ ~:'gvR;x  
 // Construction J tn&o"C  
 public: o(S^1j5  
  BOOL bTray; > 2!^ dT^D  
  BOOL bRegistered; 3|z;K,`Fw  
  BOOL RegisterHotkey(); XFLjVrX[  
  UCHAR cKey; :Kt{t46)  
  UCHAR cMask; *,Aa9wa{  
  void DeleteIcon(); fSgGQ D4  
  void AddIcon(); 0  /D5  
  UINT nCount; IJL^dXCu  
  void SaveBmp(); 7z0;FW3>9  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor \`p|,j  
  // Dialog Data X"]mR7k  
  //{{AFX_DATA(CCaptureDlg) '6Rs0__  
  enum { IDD = IDD_CAPTURE_DIALOG }; :$)aMEq  
  CComboBox m_Key; o =jX  
  BOOL m_bControl; 5VY%o8xXa  
  BOOL m_bAlt; -NI@xJO4(;  
  BOOL m_bShift; &**.naSo  
  CString m_Path; i&AXPq>`  
  CString m_Number; jb6ZAT<8  
  //}}AFX_DATA r;5 AY  
  // ClassWizard generated virtual function overrides ]VO,} `  
  //{{AFX_VIRTUAL(CCaptureDlg) 0^|$cvYiL  
 public: }b\ipA,~  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *(_ON$+3  
 protected: -f 'q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8k*k  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); tL|L"t_5x  
  //}}AFX_VIRTUAL p]J]<QaZD  
  // Implementation &El[  
 protected: g tSHy*3]  
  HICON m_hIcon; g]TI8&tP!L  
  // Generated message map functions fitK2d   
  //{{AFX_MSG(CCaptureDlg) [jmAMF<F  
  virtual BOOL OnInitDialog(); +L<w."WG  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); U iPVZ@?  
  afx_msg void OnPaint(); f/|a?n2\hm  
  afx_msg HCURSOR OnQueryDragIcon(); :7'0:'0$t  
  virtual void OnCancel(); 8?]%Q i   
  afx_msg void OnAbout(); iI/'! 85  
  afx_msg void OnBrowse(); r.W"@vc>  
  afx_msg void OnChange(); YpbdScz  
 //}}AFX_MSG ,m_&eF  
 DECLARE_MESSAGE_MAP() &Funao>  
}; ,YzC)(-  
#endif :5qqu{GL  
e>s.mH6A  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^AC+nko*  
#include "stdafx.h" NJz*N%VWD  
#include "Capture.h" [s& y_[S  
#include "CaptureDlg.h" \&|w;  
#include <windowsx.h> vb4G_X0S  
#pragma comment(lib,"hook.lib") q@=#`746e  
#ifdef _DEBUG !15@M|,OL  
#define new DEBUG_NEW !IrKou)/_  
#undef THIS_FILE 5juCeG+Z  
static char THIS_FILE[] = __FILE__; sC'A_-'  
#endif TQyFF/K  
#define IDM_SHELL WM_USER+1 +k"8e?/e.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {Rh+]=7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [~rk`  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; (Nve5  
class CAboutDlg : public CDialog E].a|4sh  
{ .bl/At3A  
 public:  Q-3J0=  
  CAboutDlg(); }F9?*2\/  
  // Dialog Data #)c;i<Q3S  
  //{{AFX_DATA(CAboutDlg) trNK9@wT)  
  enum { IDD = IDD_ABOUTBOX }; -_H2FlB  
  //}}AFX_DATA ?R~Ye  
  // ClassWizard generated virtual function overrides yW7S }I  
  //{{AFX_VIRTUAL(CAboutDlg) Y)-)NLLG;n  
 protected: " kJWWR  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `5aypJf 1  
  //}}AFX_VIRTUAL 5;uX"z G  
  // Implementation g\mrRZ/?  
 protected: SGT-B.  
  //{{AFX_MSG(CAboutDlg) 1=cfk#  
  //}}AFX_MSG ^a0 -5  
  DECLARE_MESSAGE_MAP() gB'Ah-@,P  
}; OA5md9P;d  
T;vPR,]rz  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &JzF   
{ k>@^M]%  
 //{{AFX_DATA_INIT(CAboutDlg) w6%CB E2  
 //}}AFX_DATA_INIT Ab|NjY:  
} bTYP{x~ y  
)6S}O* 1  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) {;rpgc  
{ Xf/<.5A  
 CDialog::DoDataExchange(pDX); 7|?@\ZE  
 //{{AFX_DATA_MAP(CAboutDlg) [,V92-s;N  
 //}}AFX_DATA_MAP 6P[O8  
} /[|md0,  
;$&5I9N  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2SCf]&  
 //{{AFX_MSG_MAP(CAboutDlg) a!]QD`  
 // No message handlers '/)_{Ly  
 //}}AFX_MSG_MAP +,w|&y  
END_MESSAGE_MAP() Hr.JZ>~<  
e Eb1R}@  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) F1]PYx$X  
: CDialog(CCaptureDlg::IDD, pParent) YSUH*i/%  
{ pzp"NKx i  
 //{{AFX_DATA_INIT(CCaptureDlg) J ##X5'a3*  
  m_bControl = FALSE; 'S-"*:$,u  
  m_bAlt = FALSE; %b'VEd7  
  m_bShift = FALSE; wUPywV1UO  
  m_Path = _T("c:\\"); WYd,tGz  
  m_Number = _T("0 picture captured."); W}i$f -K  
  nCount=0; MrjB[3Td  
  bRegistered=FALSE; %^BOYvPx  
  bTray=FALSE; i: uA&9  
 //}}AFX_DATA_INIT [==Z1Q;=  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]3cf}Au  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 0a-:x4  
} u~Cqdr5 \l  
I&@@v\$*  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) \:^n-D*fX  
{ aNEy1-/(\  
 CDialog::DoDataExchange(pDX); RJm8K,3#  
 //{{AFX_DATA_MAP(CCaptureDlg) F n Rxc  
  DDX_Control(pDX, IDC_KEY, m_Key); _ r)hr7  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ,,-3p#P bw  
  DDX_Check(pDX, IDC_ALT, m_bAlt); @ dU3d\!}  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); "k@/Z7=  
  DDX_Text(pDX, IDC_PATH, m_Path); u,k8i:JY  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 2\W<EWJ@  
 //}}AFX_DATA_MAP -5*;J&.  
} F476"WF  
^mb*w)-p?  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) JO$]t|I  
//{{AFX_MSG_MAP(CCaptureDlg) |?Uc:VFF  
 ON_WM_SYSCOMMAND() B_G7F[/K  
 ON_WM_PAINT() ~a|Q[tiV]  
 ON_WM_QUERYDRAGICON() yKy)fn!  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) {.)~4.LhQM  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) T1TZ+ \  
 ON_BN_CLICKED(ID_CHANGE, OnChange) .-*nD8b  
//}}AFX_MSG_MAP ^]K)V  
END_MESSAGE_MAP() zL{@LHP  
g5'bUYsa  
BOOL CCaptureDlg::OnInitDialog() ^IZ0M1&W;  
{ AR2+W^aM3  
 CDialog::OnInitDialog(); cLF>Jvs*J  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); J(*"S!q)6  
 ASSERT(IDM_ABOUTBOX < 0xF000); jpS#'h  
 CMenu* pSysMenu = GetSystemMenu(FALSE); VrP%4P+  
 if (pSysMenu != NULL) oW9rl]+  
 { gVWLY;c 3}  
  CString strAboutMenu; C#cEMKa  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ,6)y4=8 L  
  if (!strAboutMenu.IsEmpty()) cjpl_}'L:  
  { spDRQ_qq  
   pSysMenu->AppendMenu(MF_SEPARATOR); !ry+ r!"  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); PQ|x?98  
  } :G)x+0u  
 } No+zw%l0E  
 SetIcon(m_hIcon, TRUE); // Set big icon $h f\ #'J  
 SetIcon(m_hIcon, FALSE); // Set small icon Nd)o1 {I  
 m_Key.SetCurSel(0); ?*dx=UI  
 RegisterHotkey(); ps J 1J  
 CMenu* pMenu=GetSystemMenu(FALSE); j> M%?Tw  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); FkkB#Jk4  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); j<5R$^?U  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); $~\qoW<  
 return TRUE; // return TRUE unless you set the focus to a control D(GHkS*0q  
} >FhBl\oIi  
K6Ua~N^  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) >,1LBM|0u  
{ Y5 pNKL  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) {1c eF  
 { (9%%^s]uPT  
  CAboutDlg dlgAbout; 0:S)2"I58p  
  dlgAbout.DoModal(); j+_75t`AZ  
 } Un+Jz ?Y  
 else (\ %y)  
 { JC3)G/m(03  
  CDialog::OnSysCommand(nID, lParam); (q7mzZY  
 } 9)X<}*(qo  
} 4\RuJx  
q>Y[.c-  
void CCaptureDlg::OnPaint() ddxv.kIj.  
{ S?<Qa;  
 if (IsIconic()) l"#,O$x"#@  
 { V&85<Y%Nl|  
  CPaintDC dc(this); // device context for painting s*Ll\#  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ],4LvIPD  
  // Center icon in client rectangle [ V~bo/n  
  int cxIcon = GetSystemMetrics(SM_CXICON); |-<L :%  
  int cyIcon = GetSystemMetrics(SM_CYICON); 0^^i=iE-u  
  CRect rect; YO61 pZY  
  GetClientRect(&rect); aT[7L9Cw  
  int x = (rect.Width() - cxIcon + 1) / 2; Z2 4 m  
  int y = (rect.Height() - cyIcon + 1) / 2; @x4Dt&:"  
  // Draw the icon E$ rSrT(  
  dc.DrawIcon(x, y, m_hIcon); W,+91rup  
 } Q0q$ZK6C  
 else 0:p#%Nvg  
 { n!nv.-n  
  CDialog::OnPaint(); qa6up|xUnn  
 } L1BpY-=  
} 'z:p8"h}  
b.+\qaR  
HCURSOR CCaptureDlg::OnQueryDragIcon() .(ir2g  
{ ya=51~ by"  
 return (HCURSOR) m_hIcon; I'hQbLlG  
} `$HO`d@0*R  
%cL:*D4oz  
void CCaptureDlg::OnCancel() TMBdneS-s  
{ I&c#U+-A'  
 if(bTray) RB!E>]   
  DeleteIcon(); nm.d.A/]Z  
  CDialog::OnCancel(); %{"STbO#>  
} 95/C4q  
Wi<Fkzj  
void CCaptureDlg::OnAbout() @So"(^  
{ ~sD'pS  
 CAboutDlg dlg; /j As`"U  
 dlg.DoModal(); ?9cy5z[  
} he #iWD'  
mLSAi2Y  
void CCaptureDlg::OnBrowse() +l\Dp  
{ T rW3@@}j  
 CString str; R >TtAm0N  
 BROWSEINFO bi; @UX`9]-P  
 char name[MAX_PATH]; QNY{ p k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); )g9qkQ8q  
 bi.hwndOwner=GetSafeHwnd(); Yaqim<j  
 bi.pszDisplayName=name; fz*6 B NJ  
 bi.lpszTitle="Select folder"; Z"u/8  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; $9/r*@bu8d  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); $}@l l^  
 if(idl==NULL) Yc}b&  
  return; c-F&4V  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >8so'7(  
 str.ReleaseBuffer(); YuZnuI@m9  
 m_Path=str; )C[8#Q-:  
 if(str.GetAt(str.GetLength()-1)!='\\') ]Az >W*Y  
  m_Path+="\\"; QG.FW;/L,  
 UpdateData(FALSE); HO>uS>+  
} !*;)]j  
AF !_! qc;  
void CCaptureDlg::SaveBmp() sXTO`W/  
{ H{8\<E:V+}  
 CDC dc; I5mS!m/X  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); -oj@ c OZ  
 CBitmap bm; ;_!;D#:  
 int Width=GetSystemMetrics(SM_CXSCREEN); $si2H8  
 int Height=GetSystemMetrics(SM_CYSCREEN); QXCI+Fcg  
 bm.CreateCompatibleBitmap(&dc,Width,Height); SL*(ZEn"  
 CDC tdc; OA;L^d  
 tdc.CreateCompatibleDC(&dc); =0Mmxd&o=M  
 CBitmap*pOld=tdc.SelectObject(&bm); %Vq@WF  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); :BS`Q/<w  
 tdc.SelectObject(pOld); 7@\iBmr6  
 BITMAP btm; he,T\ };  
 bm.GetBitmap(&btm); \;]~K6=  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 4{V=X3,x  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); PuWF:'w r  
 BITMAPINFOHEADER bih; j,Y=GjfGM  
 bih.biBitCount=btm.bmBitsPixel; W$W7U|Z9y+  
 bih.biClrImportant=0; tF 4"28"h  
 bih.biClrUsed=0; z|Xl%8  
 bih.biCompression=0; LS`Gg7]S  
 bih.biHeight=btm.bmHeight; oKUJB.PF  
 bih.biPlanes=1; P7 n~Ui~U  
 bih.biSize=sizeof(BITMAPINFOHEADER); ]Q+Tm2{  
 bih.biSizeImage=size; X!m/I i$q  
 bih.biWidth=btm.bmWidth; BmZd,}{  
 bih.biXPelsPerMeter=0; <M=K!k  
 bih.biYPelsPerMeter=0; $d'Gh2IGA  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <_+8c{G  
 static int filecount=0; B N=,>-O%  
 CString name; VH/_0  
 name.Format("pict%04d.bmp",filecount++); \K=Jd#9c  
 name=m_Path+name; &Z?uK,8  
 BITMAPFILEHEADER bfh; OtJS5A  
 bfh.bfReserved1=bfh.bfReserved2=0; iMS S8J  
 bfh.bfType=((WORD)('M'<< 8)|'B'); #8A|-u=3  
 bfh.bfSize=54+size; 6gv.n  
 bfh.bfOffBits=54; +ad 2  
 CFile bf; 2 IGAZ%%  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ MkQSq MU=  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Kxg09\5i  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); rei<{woX  
  bf.WriteHuge(lpData,size); ,,?t>|3  
  bf.Close(); B,676~I  
  nCount++; 'uh6?2)wG  
 } %!@Dop/<  
 GlobalFreePtr(lpData); 1.+MX(w  
 if(nCount==1) W];4P=/  
  m_Number.Format("%d picture captured.",nCount); VGSe<6Hh  
 else G2mv6xK'  
  m_Number.Format("%d pictures captured.",nCount); a 3H S!/  
  UpdateData(FALSE); XG0,@Ly  
} 'vXrA  
7w9) ^  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) b3Do{1BV  
{ *@yYqI<1a  
 if(pMsg -> message == WM_KEYDOWN)  l)?c3  
 { RxqXGM`4  
  if(pMsg -> wParam == VK_ESCAPE) ? O.&=im_  
   return TRUE; {pVD`#Tl[  
  if(pMsg -> wParam == VK_RETURN) *w!H -*`  
   return TRUE; 8g<3J-7Mm  
 } 9%4rO\q  
 return CDialog::PreTranslateMessage(pMsg); e|`&K"fnq  
} Lm8 cY  
)ZT&V I  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  @521 zi  
{ djk   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ sYvO"|  
  SaveBmp(); mFT[[Z#  
  return FALSE; uvT]MgT  
} l?ofr*U&-x  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ DJeG  
 CMenu pop; 2lQ'rnqS)  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); rK];2[U  
 CMenu*pMenu=pop.GetSubMenu(0); u+hzCCwtR  
 pMenu->SetDefaultItem(ID_EXITICON); R!:1{1  
 CPoint pt; k+&|*!j  
 GetCursorPos(&pt); .*8.{n5   
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); na<g /&  
 if(id==ID_EXITICON) 8G9V8hS1#B  
  DeleteIcon(); MLUq"f~N  
 else if(id==ID_EXIT) 1<lLE1fk  
  OnCancel(); N j?,'?'O}  
 return FALSE; klPc l[.w  
} gX);/;9mm+  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ^58'*13ZL  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ) ><{A  
 AddIcon(); .t\5H<z  
 return res; @}#$<6|  
} m|'TPy  
D9JT)a  
void CCaptureDlg::AddIcon() y>|7'M*+  
{ &}rh+z  
 NOTIFYICONDATA data; r3#H]c  
 data.cbSize=sizeof(NOTIFYICONDATA); vQztD _bX%  
 CString tip; `6UW?1_Z5  
 tip.LoadString(IDS_ICONTIP); NX$$4<A1  
 data.hIcon=GetIcon(0); \s [Uq  
 data.hWnd=GetSafeHwnd(); -8g ;t3z  
 strcpy(data.szTip,tip); q W) ,)i  
 data.uCallbackMessage=IDM_SHELL; *2@Ne[dYEF  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; g!4"3Dtdg  
 data.uID=98; 7)~/`w)P  
 Shell_NotifyIcon(NIM_ADD,&data); HdLVXaD/  
 ShowWindow(SW_HIDE); ]e R1 +Nl  
 bTray=TRUE; |FH/Q-7[  
} W*gu*H^s~  
[&6l=a  
void CCaptureDlg::DeleteIcon() y 2&G0y  
{ +,If|5>(  
 NOTIFYICONDATA data; aM~M@wS  
 data.cbSize=sizeof(NOTIFYICONDATA); <vOljo  
 data.hWnd=GetSafeHwnd(); pS9CtQqvgy  
 data.uID=98; Ju+r@/y%  
 Shell_NotifyIcon(NIM_DELETE,&data); v]c1|?9p'  
 ShowWindow(SW_SHOW); $$`}b^,/  
 SetForegroundWindow(); &%rX RP  
 ShowWindow(SW_SHOWNORMAL); amOBUD5Ld`  
 bTray=FALSE; SI U"cO4  
} (m})V0/`  
3. fIp5g  
void CCaptureDlg::OnChange() om|M=/^  
{ Wk`G+VR+  
 RegisterHotkey(); taw #r  
} vuA';,:~  
anHP5gD  
BOOL CCaptureDlg::RegisterHotkey() bNj| GIf  
{ tvZpm@1  
 UpdateData(); az\ ;D\\  
 UCHAR mask=0; V\^?V|  
 UCHAR key=0; Jt@7y"<  
 if(m_bControl) gQh;4v  
  mask|=4; [[ H XOPaV  
 if(m_bAlt) )9==6p  
  mask|=2; DtR-NzjB  
 if(m_bShift) pJ1GB  
  mask|=1; uG~%/7Qt{  
  key=Key_Table[m_Key.GetCurSel()]; H;%a1  
 if(bRegistered){ W%@6D|^  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); |v:8^C7  
  bRegistered=FALSE; $D1Pk  
 } &$|k<{j[<f  
 cMask=mask; O]90 F  
 cKey=key; Ju Kj  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Z'hW;^e%_z  
 return bRegistered; BB>3Kj:|  
} e=QnGT*b5  
/\(0@To  
  四、小结 mq do@  
tNoo3&  
  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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