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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: Mib<1ZM  
  9a3mN(<  
  一、实现方法 1CpIK$/  
xty)*$C>  
  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: We?cRb  
|++\"g  
#pragma data_seg("shareddata") O[<0\  
HHOOK hHook =NULL; //钩子句柄 P QA}_o  
UINT nHookCount =0; //挂接的程序数目 9KGi%UIFvn  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 yHjuT+/wM,  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 m9 D' yXZ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey n|AV7c  
static int KeyCount =0; [ T!0ka  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 dxK3462  
#pragma data_seg() VFLW @  
8q_"aa,`  
  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。 -wrVhCd~g]  
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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: 8m"jd+  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR r0(*]K:.  
cKey,UCHAR cMask) {?hpW+1,#  
{ K4K]oT  
 BOOL bAdded=FALSE; tiQeON-Q_  
 for(int index=0;index<MAX_KEY;index++){ x#c%+  
  if(hCallWnd[index]==0){ bTbF  
   hCallWnd[index]=hWnd; {dXmSuO  
   HotKey[index]=cKey; b  >x03%  
   HotKeyMask[index]=cMask; crl"Ec  
   bAdded=TRUE; TAp8x  
   KeyCount++; "'v^X!"  
   break; dBNx2T}_0  
  } :hFKmoy#  
 } RAB'%CY4  
 return bAdded; i.Z iLDs\7  
} J1g+H2  
//删除热键 =:;K nS  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +sFpIiJg  
{ )zK@@E  
 BOOL bRemoved=FALSE; gnN"6r1  
 for(int index=0;index<MAX_KEY;index++){ %_%Bb Qf  
  if(hCallWnd[index]==hWnd){ kcG_ n  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7Xf52\7n  
    hCallWnd[index]=NULL; V[2}  
    HotKey[index]=0; e6gLYhf&  
    HotKeyMask[index]=0; bZWdd6  
    bRemoved=TRUE; o1Nfn'!3/>  
    KeyCount--; zyP9 n[eZ  
    break; ;LqpX!Pi f  
   } \[&&4CN{  
  } W^YaC (I  
 } $Ts;o  
 return bRemoved; ;(&S1Rv9  
} #7['M;_  
\>[k0<  
l KG' KR.  
  DLL中的钩子函数如下: |8?e4yVd  
`d$@1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |oke)w=gn  
{ gK9d `5  
 BOOL bProcessed=FALSE; \0d'y#Gp*  
 if(HC_ACTION==nCode) }ePl&-9T  
 { ~^V&n`*7D  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 TKv!wKI  
   switch(wParam) (Jw_2pHxr"  
   {  GPK\nz}  
    case VK_MENU: uT4|43< G  
     MaskBits&=~ALTBIT; Y55u -9|N  
     break; N UX |  
    case VK_CONTROL: n)98NSVDbT  
     MaskBits&=~CTRLBIT; Lr D@QBT  
     break; )\=xPfs  
    case VK_SHIFT: T1 $E][@Iv  
     MaskBits&=~SHIFTBIT; y'`/^>.  
     break; jh)@3c  
    default: //judge the key and send message j *G: 8Lg  
     break; P .m@|w&.K  
   } ,M;9|kE*  
   for(int index=0;index<MAX_KEY;index++){ nYj rEy)Q  
    if(hCallWnd[index]==NULL) , :#bo]3  
     continue; ]*\MIz{56'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z6C(?R  
    { GQn:lu3j:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )6C+0b*  
     bProcessed=TRUE; ?gl&q+mv  
    } 8YQuq.(>a  
   } 7TMq#Pb  
  } 1xW!j!A;  
  else if((lParam&0xc000ffff)==1){ //有键按下 Giv,%3'  
   switch(wParam) %S^hqC  
   { 78uImC*o  
    case VK_MENU: [~ s+,OO9)  
     MaskBits|=ALTBIT; UxTLr-db^  
     break; B2ln8NF#Q  
    case VK_CONTROL: X3l>GeUi  
     MaskBits|=CTRLBIT; # dWz,e3   
     break; @%Ld\8vdfJ  
    case VK_SHIFT: hpF_@n  
     MaskBits|=SHIFTBIT; 112 WryS  
     break; E+@Q u "W  
    default: //judge the key and send message 6:#o0OeBP  
     break; {fR\yWkt?  
   } vn^O m-\  
   for(int index=0;index<MAX_KEY;index++){ h9H z6 >  
    if(hCallWnd[index]==NULL) z4:!*:.Asu  
     continue; JY#vq'dl|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lPR=C0h}@  
    { gu(:'5cX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;{sZDjev>  
     bProcessed=TRUE; @ep.wW  
    } bkV<ZUW|;  
   } )[Tm[o?Y.  
  } L7C ;l,ot  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 c| ^I}  
   for(int index=0;index<MAX_KEY;index++){ x.+T65X~4  
    if(hCallWnd[index]==NULL) 'v6@5t19j  
     continue; ?.46X^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `q*[fd1u.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 2LtDS?)@  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 m^3x%ENZ  
   } 3x+lf4"  
  } @Lnv  
 } 6nW)2LV  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); j&d5tgLB  
} v1OVrk>s>  
~S8:xG+s  
  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: " ]S  
#DUfEZ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); duY?LJ@g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `}Zqmfs  
TJ"-cWpO1  
  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: Dp([r  
BiYxI{VFD  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) # rkq ?:Q  
{ \?xM% (:<Q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) :<J7g`f  
 { FCE y1^u  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 .4+R ac  
  SaveBmp(); q?}C`5%D  
  return FALSE; }=-0 DSLVj  
 } >C|pY6  
 …… //其它处理及默认处理 ~[ufL25K  
} a^R?w|zCX  
e(0OZ_w  
!Km[Qw k-  
  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。 (7Z+De?  
&<F9Z2^  
  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。 T*x2+(r  
xb;{<~`71  
  二、编程步骤 wMW<lT=;  
NrqJf-ldo  
  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"; r<vMp'u  
#t ;`  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; [neuwdN  
LikcW#  
  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; AF'<  
'ITq\1z  
  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; 2%%\jlT_  
sA2-3V<t8  
  5、 添加代码,编译运行程序。 ALMsF2H  
b$_81i  
三、程序代码 !.vyzCJTzB  
1/}H 0\9'  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ,2FK$: M\  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) gm9*z.S\'  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ k\f _\pj6  
#if _MSC_VER > 1000 KQ\K :#  
#pragma once _ Sr}3  
#endif // _MSC_VER > 1000 2R/|/>T v  
#ifndef __AFXWIN_H__ P 9?cp{*  
#error include 'stdafx.h' before including this file for PCH OC=&!<  
#endif eEZgG=s  
#include "resource.h" // main symbols vIV|y>;g  
class CHookApp : public CWinApp u$T]A8e  
{ YG\#N+D  
 public: RjW wsC~B  
  CHookApp(); :33@y%>L  
  // Overrides 2*Qv6 :qK  
  // ClassWizard generated virtual function overrides I6.rN\%b  
  //{{AFX_VIRTUAL(CHookApp) :;{M0  
 public: FGV L[\  
  virtual BOOL InitInstance(); :j&enP5R(q  
  virtual int ExitInstance(); ^k6_j\5j  
  //}}AFX_VIRTUAL [^hW>O=@TN  
  //{{AFX_MSG(CHookApp) 2zC4nF)>O  
  // NOTE - the ClassWizard will add and remove member functions here. ~gI%lORqN  
  // DO NOT EDIT what you see in these blocks of generated code ! 2 @#yQB1  
  //}}AFX_MSG '<Zm>L&  
  DECLARE_MESSAGE_MAP() n>'(d*[e&  
}; j`_S%E%X  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); $)M3fZ$#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); o~LJ+m6-)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Hx.|5n,5  
BOOL InitHotkey(); NUsxMhP  
BOOL UnInit(); k|;a"56F  
#endif &_L@hsm  
si0}b~t  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. $TUYxf0q  
#include "stdafx.h" !*#9b  
#include "hook.h" =$'>VPQ  
#include <windowsx.h> 5Kzt8Tv[  
#ifdef _DEBUG >_}isCd,  
#define new DEBUG_NEW Nv5^2^Sc=  
#undef THIS_FILE <F9-$_m  
static char THIS_FILE[] = __FILE__; dseI~}  
#endif L)'G_)Sl  
#define MAX_KEY 100 :;%Jm  
#define CTRLBIT 0x04 .<m]j;|6  
#define ALTBIT 0x02 yT^2;/Z  
#define SHIFTBIT 0x01 I\)`,w  
#pragma data_seg("shareddata") L.;b( bFe  
HHOOK hHook =NULL; K=f4<tP_  
UINT nHookCount =0; rNN>tpZ}  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey p(yv  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT c9/w{}F  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey YmljHQP  
static int KeyCount =0; !u7KgB<=/F  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 1Yb&E7j  
#pragma data_seg() MdBmq/[O  
HINSTANCE hins; Z`-$b~0  
void VerifyWindow(); <'\Nv._2a  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) U%vTmdOY  
//{{AFX_MSG_MAP(CHookApp) >2#<gp3  
// NOTE - the ClassWizard will add and remove mapping macros here. vobC/m  
// DO NOT EDIT what you see in these blocks of generated code! v`4w=!4  
//}}AFX_MSG_MAP @<W` w  
END_MESSAGE_MAP() @GQe-04W`  
x1:mT[[$  
CHookApp::CHookApp() *;Kp"j  
{ kff N0(MR  
 // TODO: add construction code here, ILuQ.VhBVN  
 // Place all significant initialization in InitInstance Y}[<KK}_  
} <K)]kf  
^wy  
CHookApp theApp; 1Ek3^TOv7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) _9BL7W $;  
{ 3,p!Fun:r  
 BOOL bProcessed=FALSE; \S h/<z  
 if(HC_ACTION==nCode) *~8F.c x  
 { {\>4)TA  
  if((lParam&0xc0000000)==0xc0000000){// Key up qGX@mo({  
   switch(wParam) $:u*)&"t|  
   { Le#srr  
    case VK_MENU: AE~zm tW  
     MaskBits&=~ALTBIT; x}2nn)fdZ  
     break; JE O$v|X  
    case VK_CONTROL: HxbzFu?h  
     MaskBits&=~CTRLBIT; W B:0}b0Gu  
     break; ?;tPqOs&  
    case VK_SHIFT: nf pO  
     MaskBits&=~SHIFTBIT; >33=0<  
     break; RxP~%oADw  
    default: //judge the key and send message her>L3G-E  
     break; bqn(5)%{  
   } 1ZF KLI`V  
   for(int index=0;index<MAX_KEY;index++){ 2*snMA  
    if(hCallWnd[index]==NULL) |?KYY0  
     continue; +c8`N'~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kw59`z Es  
    { :s_o'8z7L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); | >}CoR7  
     bProcessed=TRUE; 8YZ9  
    } bB4FjC':  
   } ]fb@>1 jp  
  } `c ^ ">L  
  else if((lParam&0xc000ffff)==1){ //Key down InRRcn(  
   switch(wParam) <Vt"%C  
   { g/FT6+&T.  
    case VK_MENU: ~-G_c=E?  
     MaskBits|=ALTBIT; E:B<_  
     break; #y"LFoJn  
    case VK_CONTROL: ,dosF Q  
     MaskBits|=CTRLBIT; #N|JC d_  
     break; .F%jbnKd_  
    case VK_SHIFT: _V8;dv8  
     MaskBits|=SHIFTBIT; (["V( $  
     break; Y~*aA&D  
    default: //judge the key and send message ] X)~D!mA  
     break; pVzr]WFx  
   } wi%ls8F  
   for(int index=0;index<MAX_KEY;index++) '~7zeZ'  
   { Wwr  
    if(hCallWnd[index]==NULL) L?M x"  
     continue; y,OG9iD:h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xh#pw2v7V  
    { *c%{b3T_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 0DnOO0Nc  
     bProcessed=TRUE; 4hfq7kq7(  
    } / $s(OFbi#  
   } eR`Q7]j] -  
  } +M#}(hK  
  if(!bProcessed){ %2B1E( r%M  
   for(int index=0;index<MAX_KEY;index++){ KLu Og$i  
    if(hCallWnd[index]==NULL) cf ^i!X0  
     continue; Q W c^}#!!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5G`fVsb  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); M0?%r`  
   } %] :ZAmN  
  } G^.tAO5:f  
 } Xx2t0AIB  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <u],R.S)  
} 8X278^ #  
VfDa>zV3  
BOOL InitHotkey() v046  
{ 'n\PS,[1R  
 if(hHook!=NULL){ BG.sHI{  
  nHookCount++; =}I=s@  
  return TRUE; 9%"\s2T  
 } .RAyi>\e  
 else 3^$=XrD  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); g>gf-2%Uo  
  if(hHook!=NULL) rQ2TPX<?a  
   nHookCount++; s%>8y\MaK  
  return (hHook!=NULL); 1{a4zGE?[  
} lF40n4}  
BOOL UnInit() ;i/? fw[h  
{ 5DkEJk7a  
 if(nHookCount>1){ a0PU&o1EF  
  nHookCount--; -okq= 9  
  return TRUE; M"qS#*{  
 } N>Uxq& )!  
 BOOL unhooked = UnhookWindowsHookEx(hHook); OjG`s-91&  
 if(unhooked==TRUE){ CBpwtI>p  
  nHookCount=0; {^:NII]  
  hHook=NULL; m~P30)  
 } :qAX9T'{t  
 return unhooked; 23,pVo  
} G$QN_h,}  
.Y8P6_  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /EegP@[  
{ Je2&7uR0  
 BOOL bAdded=FALSE; -xN/H,xok  
 for(int index=0;index<MAX_KEY;index++){ Xh3b=i|K  
  if(hCallWnd[index]==0){ d+ZXi'  
   hCallWnd[index]=hWnd; G-R83Orl  
   HotKey[index]=cKey; 02NVdpo[wU  
   HotKeyMask[index]=cMask; loE;q}^  
   bAdded=TRUE; Z5*(xony0  
   KeyCount++; .c@Y ?..+  
   break; fOdqr  
  } 19pFNg'kA  
 } ^Oeixi@f  
 return bAdded; =K|#5p`  
} V\e1NS  
SXO.|"M  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ![fNlG!r  
{ >ke.ZZV?  
 BOOL bRemoved=FALSE; -Lb7=98  
 for(int index=0;index<MAX_KEY;index++){ 'O.f}m SS  
  if(hCallWnd[index]==hWnd){ lFSvHs5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1w7XM0SHcn  
    hCallWnd[index]=NULL; `g)  
    HotKey[index]=0; \7#w@3*  
    HotKeyMask[index]=0; W,H=K##6<  
    bRemoved=TRUE; bhbTloCR  
    KeyCount--; #a2Z.a<V  
    break; 1CSGG'J]E  
   } ;(;~yB|NZ5  
  } 9}Z;(,6/.\  
 } =n_z`I  
 return bRemoved; 3^-R_  
} }m%&|:PH  
R$A%Zh6  
void VerifyWindow() ^6F, lS_t  
{ 11Qi _T\  
 for(int i=0;i<MAX_KEY;i++){ YjJ^SU`*  
  if(hCallWnd!=NULL){ w Jp1Fl~  
   if(!IsWindow(hCallWnd)){ 8O60pB;4  
    hCallWnd=NULL; /"m#mh L  
    HotKey=0; %hw4IcWJ|  
    HotKeyMask=0; J=(i0A  
    KeyCount--; !<VP[%2L~  
   } 2Oyw#1tdn  
  } Y  9z*xS  
 } 55UPd#E'  
} ` "-P g5  
T<b* =i  
BOOL CHookApp::InitInstance() Nh/i'q/  
{ !b4AeiL>w  
 AFX_MANAGE_STATE(AfxGetStaticModuleState());  7( Z9\  
 hins=AfxGetInstanceHandle(); f8=qnY2j  
 InitHotkey(); VAUd^6Xdwx  
 return CWinApp::InitInstance(); Iw)m9h  
} Kb;Pd!Q  
X&5N 89  
int CHookApp::ExitInstance() M8\/[R\  
{ &m[}%e%~0  
 VerifyWindow(); M5dEZ  
 UnInit(); *n# =3D  
 return CWinApp::ExitInstance(); eY^zs0  
} ?u".*!%  
iC^91!<  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 3 Fy C D4#  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) '+j;g  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !wfUD2 K1  
#if _MSC_VER > 1000 #.fJ M:"tG  
#pragma once n5BD0q  
#endif // _MSC_VER > 1000 ?$tD  
/L@o.[H  
class CCaptureDlg : public CDialog r|\{!;7  
{ 1q5S"=+W[  
 // Construction Uam %u  
 public: (JnEso-V  
  BOOL bTray; Fv$w:r]q6  
  BOOL bRegistered; G,^ ?qbHg  
  BOOL RegisterHotkey(); w'$>E4\   
  UCHAR cKey; DTo"{!  
  UCHAR cMask; _y>drvg  
  void DeleteIcon(); :V#xrH8R  
  void AddIcon(); 5M #',(X  
  UINT nCount; :"Tkl$@,  
  void SaveBmp(); ]GCw3r(!  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor V lO^0r^z  
  // Dialog Data be]/ROP>H  
  //{{AFX_DATA(CCaptureDlg) s"w^E\ >6  
  enum { IDD = IDD_CAPTURE_DIALOG }; ,3MHZPJ?k]  
  CComboBox m_Key;  AW|SD  
  BOOL m_bControl; $?gKIv>g  
  BOOL m_bAlt; tQUKw@@Q  
  BOOL m_bShift; 0c!^=(  
  CString m_Path; "-MB U  
  CString m_Number; BI*0JKQu  
  //}}AFX_DATA `v<S  
  // ClassWizard generated virtual function overrides ;~[}B v  
  //{{AFX_VIRTUAL(CCaptureDlg) \pTC[Ry1  
 public: & ?5)Jis:  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 8'TIDu  
 protected: oAB:H \  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7F~gA74h  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); T;{:a-8  
  //}}AFX_VIRTUAL uW/>c$*)  
  // Implementation gp$Rf9\  
 protected: QkHG`yW  
  HICON m_hIcon; xE!0p EHd  
  // Generated message map functions  ggM~Chr  
  //{{AFX_MSG(CCaptureDlg) BB V>Q L  
  virtual BOOL OnInitDialog(); /Ix5`Q)  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); NRT]dYf"z  
  afx_msg void OnPaint(); ev+H{5W8  
  afx_msg HCURSOR OnQueryDragIcon(); #^9k&t#!6  
  virtual void OnCancel(); NYG!\u\Rm  
  afx_msg void OnAbout(); ! os@G  
  afx_msg void OnBrowse();  QV\a f  
  afx_msg void OnChange(); S'ms>ZENC  
 //}}AFX_MSG KQ81Oxu*C  
 DECLARE_MESSAGE_MAP() iPWr-  
}; Y= =5\;-  
#endif >m <T+{`  
*HGhm04F{  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file YPY,g R  
#include "stdafx.h" 7w8UnPuM  
#include "Capture.h" _G.!^+)kEm  
#include "CaptureDlg.h" 1MnC5[Q  
#include <windowsx.h> R-OO1~W=  
#pragma comment(lib,"hook.lib") $ywROa]  
#ifdef _DEBUG S&]r6ss  
#define new DEBUG_NEW |r)QkxdU,  
#undef THIS_FILE n|DMj[uT  
static char THIS_FILE[] = __FILE__; 5ZH3}B^L$  
#endif p>3QW3<  
#define IDM_SHELL WM_USER+1 "XLtrAu{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2*#i/SE_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zF{~Md1  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 8JF<SQ  
class CAboutDlg : public CDialog /cUu]#h  
{ f5un7,m  
 public: #G`K<%{?f  
  CAboutDlg(); (&r` l&0  
  // Dialog Data 'wMvO{}$  
  //{{AFX_DATA(CAboutDlg) soQ[Zg4}  
  enum { IDD = IDD_ABOUTBOX }; .oTS7rYw  
  //}}AFX_DATA yJ0 %6],^g  
  // ClassWizard generated virtual function overrides xJU]py~o  
  //{{AFX_VIRTUAL(CAboutDlg) "X;5* 4+  
 protected: N3MPW  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Buh}+n2]5  
  //}}AFX_VIRTUAL =>evkaj  
  // Implementation In1n.oRFn^  
 protected: 3RvDX p  
  //{{AFX_MSG(CAboutDlg) +TaxH;  
  //}}AFX_MSG U:3O E97  
  DECLARE_MESSAGE_MAP() PUZcb+%]h  
}; )X|)X,~+-  
8Lx1XbwK  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) FPF$~ sX  
{ $U9]v5  
 //{{AFX_DATA_INIT(CAboutDlg) }S?"mg& V  
 //}}AFX_DATA_INIT qz3 Z'  
} 9%NobT  
|j9aTv[`  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) f8N* [by  
{ Ml{ ]{n  
 CDialog::DoDataExchange(pDX); 5G(dvM-n  
 //{{AFX_DATA_MAP(CAboutDlg) ISK 8t  
 //}}AFX_DATA_MAP P2aFn=f  
} Cj`~ntMN  
cqJXZ.X C  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) t1J3'lS  
 //{{AFX_MSG_MAP(CAboutDlg) Z2})n -  
 // No message handlers jn(!6\n"  
 //}}AFX_MSG_MAP ){'<67dK  
END_MESSAGE_MAP() } eHxw+.  
'bSWJ/;p)  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) DQP!e6Of  
: CDialog(CCaptureDlg::IDD, pParent) tvFe_*Ck  
{ S1Od&v[R  
 //{{AFX_DATA_INIT(CCaptureDlg) wuYak"KX  
  m_bControl = FALSE; 1;S?9N_B  
  m_bAlt = FALSE; y {Bajil  
  m_bShift = FALSE; E0fMFG^P  
  m_Path = _T("c:\\"); u%yYLpaKf  
  m_Number = _T("0 picture captured."); 9*K-d'm  
  nCount=0; N"G\ H<n  
  bRegistered=FALSE; Y%0rji  
  bTray=FALSE; jXALL8[c  
 //}}AFX_DATA_INIT jn ztCNaX  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ;]m;p,$  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); m;{HlDez  
} h^Yh~84T  
T8|?mVv s  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) myN2G?>;  
{ \zFCph4  
 CDialog::DoDataExchange(pDX); lZ[J1:%  
 //{{AFX_DATA_MAP(CCaptureDlg) G"-V6CA[  
  DDX_Control(pDX, IDC_KEY, m_Key); N '&>bO?@`  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); (}>)X]  
  DDX_Check(pDX, IDC_ALT, m_bAlt); R13k2jLSQ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Et(H6O 8  
  DDX_Text(pDX, IDC_PATH, m_Path); \$DBtq5=  
  DDX_Text(pDX, IDC_NUMBER, m_Number); f"*4R kG  
 //}}AFX_DATA_MAP $ ~%Y}Xt*  
} 0)b1'xt',  
!^98o:"x  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @ %L  
//{{AFX_MSG_MAP(CCaptureDlg) tKLeq(  
 ON_WM_SYSCOMMAND() !> +Lre@  
 ON_WM_PAINT() Vq`/]&  
 ON_WM_QUERYDRAGICON() 0n`Temb/  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Hf_ pe  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) W% Lrp{  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +4T.3Njjn  
//}}AFX_MSG_MAP u1u;aG  
END_MESSAGE_MAP() ^q/^.Gf  
>.od(Fh{l|  
BOOL CCaptureDlg::OnInitDialog() w_@{v wM$A  
{ H*3u]Ebh  
 CDialog::OnInitDialog(); z(^dwMw}  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); *?uUP  
 ASSERT(IDM_ABOUTBOX < 0xF000); mr G?5.7W  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Ti0kfjhX7  
 if (pSysMenu != NULL) ,%xat`d3,3  
 { Lk#)VGk:  
  CString strAboutMenu; _4SZ9yu  
  strAboutMenu.LoadString(IDS_ABOUTBOX); /c-k{5mH%  
  if (!strAboutMenu.IsEmpty()) _:tS-Mx@5  
  { )T gfd5B  
   pSysMenu->AppendMenu(MF_SEPARATOR); h;r^9g  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); B= E/|J</  
  } AT3HH QD  
 } dJ])`S  
 SetIcon(m_hIcon, TRUE); // Set big icon U*sQ5uq  
 SetIcon(m_hIcon, FALSE); // Set small icon Lwf[*n d  
 m_Key.SetCurSel(0); pG)dF@  
 RegisterHotkey(); =X[?d/[  
 CMenu* pMenu=GetSystemMenu(FALSE); rOEBL|P0  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); jR\ !2!  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); >Sk%78={R  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); qyKR]%yzi  
 return TRUE; // return TRUE unless you set the focus to a control xnWezO_  
} 55<!H-zt  
Bv3B|D&+  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) >>C S8  
{ G}NqVbZ9]  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) z+wegF  
 { T9r6,yY  
  CAboutDlg dlgAbout;  #X$s5H  
  dlgAbout.DoModal(); Zj ^e8u=T  
 } 5{1=BZftZ  
 else B]gyj  
 { 9X33{  
  CDialog::OnSysCommand(nID, lParam); 0Db=/sJ>  
 } /.A"HGAk  
} !e |Bi{  
G O G[^T  
void CCaptureDlg::OnPaint() \fI05GZ  
{ ;KmrBNF  
 if (IsIconic()) wCv9VvF`  
 { OuWRLcJ!  
  CPaintDC dc(this); // device context for painting !lsa5w{  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); yn(bW\  
  // Center icon in client rectangle [GI2%uA0  
  int cxIcon = GetSystemMetrics(SM_CXICON); KE5>O1  
  int cyIcon = GetSystemMetrics(SM_CYICON); -*T0Cl.  
  CRect rect; w6mYLK%  
  GetClientRect(&rect); <)sL8G9Y  
  int x = (rect.Width() - cxIcon + 1) / 2; 3X',L*f  
  int y = (rect.Height() - cyIcon + 1) / 2; aAn p7\7  
  // Draw the icon L 9cXgd  
  dc.DrawIcon(x, y, m_hIcon); U-,s/VQ?  
 } 7z/O#Fbs  
 else G6x'Myg I  
 { tk8\,!9Q  
  CDialog::OnPaint(); :1gpbfW  
 } #RSUChe7w  
} /"~UGn]R  
gCVOm-*:  
HCURSOR CCaptureDlg::OnQueryDragIcon() {'{9B  
{ v|]"uPxH?  
 return (HCURSOR) m_hIcon; a gL@A  
} >+!Ef  
Qr6PkHU  
void CCaptureDlg::OnCancel() mWn0"1C  
{ NB.'>Sar  
 if(bTray) pY\ =f0]  
  DeleteIcon(); MTNC{:Q  
  CDialog::OnCancel(); g\IwV+iDf  
} U+E9l?4R  
$2}%3{<j  
void CCaptureDlg::OnAbout() # M!1W5#  
{ 0XqxW\8_l  
 CAboutDlg dlg; Vu E$-)&)  
 dlg.DoModal(); @^g~F&Ta  
} 2vsV :LS.  
X2:23j<  
void CCaptureDlg::OnBrowse() qss )5a/x.  
{ O;}K7rSc  
 CString str; MtoOIkQ  
 BROWSEINFO bi; !gfd!R  
 char name[MAX_PATH]; qTMY]=(  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Y ZuA"l Y  
 bi.hwndOwner=GetSafeHwnd(); /Ah&d@b  
 bi.pszDisplayName=name; SN\c 2^#  
 bi.lpszTitle="Select folder"; rQU6*f  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *8)va  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9zIqSjos"  
 if(idl==NULL) MQ0r ln?  
  return; ]T2Nr[vu  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 'ShK7j$  
 str.ReleaseBuffer(); ]bpgsW:Xu  
 m_Path=str; S)4p'cUwq  
 if(str.GetAt(str.GetLength()-1)!='\\') Y#=MN~##t  
  m_Path+="\\"; rcY &n^:  
 UpdateData(FALSE); 1Ax;|.KQH  
} 3hUP>F8  
wArfnB&  
void CCaptureDlg::SaveBmp() Eciu^  
{ Aq3\Q>klH)  
 CDC dc; !7MRHI/0C  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); zZ<*  
 CBitmap bm; 'U0W   
 int Width=GetSystemMetrics(SM_CXSCREEN); > '. : Acn  
 int Height=GetSystemMetrics(SM_CYSCREEN); =]/<Kd}A.  
 bm.CreateCompatibleBitmap(&dc,Width,Height); N>]J$[j  
 CDC tdc; g]`YI5  
 tdc.CreateCompatibleDC(&dc); q(~|roKA(  
 CBitmap*pOld=tdc.SelectObject(&bm); Qh-:P`CN  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); CXyb8z4/+  
 tdc.SelectObject(pOld); VYO1qj  
 BITMAP btm; v_WQ<G?  
 bm.GetBitmap(&btm); u*,>$(-u  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; d)acWF\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &/"a E  
 BITMAPINFOHEADER bih; %%>nM'4<  
 bih.biBitCount=btm.bmBitsPixel; BOq9\g`5s  
 bih.biClrImportant=0; a }*i [  
 bih.biClrUsed=0; FU>KiBV#  
 bih.biCompression=0; R*6B@<p,i  
 bih.biHeight=btm.bmHeight; SPt/$uYJ  
 bih.biPlanes=1; 5$N#=i`V  
 bih.biSize=sizeof(BITMAPINFOHEADER); Vp|?R65S*  
 bih.biSizeImage=size; *h3iAcM8  
 bih.biWidth=btm.bmWidth; 18Z1F  
 bih.biXPelsPerMeter=0; 6o(IL-0]c  
 bih.biYPelsPerMeter=0; ?# _{h  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); k,k>w#&  
 static int filecount=0; N)R5#JX  
 CString name; n_9Ex&?e  
 name.Format("pict%04d.bmp",filecount++); vlE]RB  
 name=m_Path+name; f% )9!qeW  
 BITMAPFILEHEADER bfh; v:yU+s|kN  
 bfh.bfReserved1=bfh.bfReserved2=0; OHsA]7S  
 bfh.bfType=((WORD)('M'<< 8)|'B'); JTm'fo[  
 bfh.bfSize=54+size; LCtVM70  
 bfh.bfOffBits=54; W ulyM cJ  
 CFile bf; 6l;2kztGp  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ NlKVl~_ C  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ljOY;WV3  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); *vuI'EbM  
  bf.WriteHuge(lpData,size); [YHtBM:y  
  bf.Close(); ]77f`<q<}!  
  nCount++; :/$WeAg  
 } liH#=C8l*%  
 GlobalFreePtr(lpData); 9 i/ (  
 if(nCount==1) LR>s2zu-  
  m_Number.Format("%d picture captured.",nCount); CW?Z\  
 else -bHlFNRm  
  m_Number.Format("%d pictures captured.",nCount); 4_ U"M@  
  UpdateData(FALSE); PS+~JwDUc  
} w]{c*4o  
S_Wq`I@b  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) p^<(.+P4  
{ 9*ZlNZ  
 if(pMsg -> message == WM_KEYDOWN) vJ^~J2#5  
 { C)EP;5k'!\  
  if(pMsg -> wParam == VK_ESCAPE) BO G.[?yx  
   return TRUE; .7g h2K  
  if(pMsg -> wParam == VK_RETURN) \WE&5 9G  
   return TRUE; w3);ZQ|  
 } -kMw[Y  
 return CDialog::PreTranslateMessage(pMsg); aXJ/"k #Tl  
} ?<C(ga  
k)S1Zs~G  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) rMbq_5}  
{ eDZ8F^0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ f?)7MR=  
  SaveBmp(); N n FR;  
  return FALSE; "}*D,[C5e  
} "j,vlG  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 9AX}V6\+  
 CMenu pop; D4 8e30  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Rq5'=L  
 CMenu*pMenu=pop.GetSubMenu(0); A%W]XEa<  
 pMenu->SetDefaultItem(ID_EXITICON); l X+~;94  
 CPoint pt; S1U0sP@o  
 GetCursorPos(&pt); a- rR`  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); X_o#!  
 if(id==ID_EXITICON) |di(hY|  
  DeleteIcon(); aX;>XL4  
 else if(id==ID_EXIT) Nbd4>M<  
  OnCancel(); [StnKQ?"wz  
 return FALSE; _) x{TnK  
} `K.C>68  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); [:cD  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) @9HRGxJ=}  
 AddIcon(); rAu% bF  
 return res; h2Nt@  
} s;OGb{H7  
ITw *m3  
void CCaptureDlg::AddIcon() 3LLG#l )8  
{ =6Ok4Z  
 NOTIFYICONDATA data; T:@6(_Z  
 data.cbSize=sizeof(NOTIFYICONDATA); .h=n [`RB  
 CString tip; N<:c*X  
 tip.LoadString(IDS_ICONTIP); h8`On/Ur_8  
 data.hIcon=GetIcon(0); {fACfSW6  
 data.hWnd=GetSafeHwnd(); 0>BxS9?w  
 strcpy(data.szTip,tip); ,XEIg  
 data.uCallbackMessage=IDM_SHELL; KSchgon0V  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; MrHJ)x"hy  
 data.uID=98; *pwkv7Z h  
 Shell_NotifyIcon(NIM_ADD,&data); DlUKhbo$g  
 ShowWindow(SW_HIDE); 8)1q,[:M  
 bTray=TRUE; Ow/,pC >V  
} (`dz3 7@*  
),p0V  
void CCaptureDlg::DeleteIcon()  \nEMj,)  
{ > k\pSV[  
 NOTIFYICONDATA data; 940:NOgm  
 data.cbSize=sizeof(NOTIFYICONDATA); R BHDfm'~7  
 data.hWnd=GetSafeHwnd(); U_*, XLU  
 data.uID=98; T$D(Y`zdn  
 Shell_NotifyIcon(NIM_DELETE,&data); *ai~!TR  
 ShowWindow(SW_SHOW); ~6t!)QATnp  
 SetForegroundWindow();  7(+4^  
 ShowWindow(SW_SHOWNORMAL); e&z@yy$  
 bTray=FALSE; + kKanm[!v  
} -H6[{WVW!  
t,f ec>.  
void CCaptureDlg::OnChange() O.B9w+G=  
{ xkDK5&V  
 RegisterHotkey(); "KP]3EyPc  
} D-BT`@~l  
g&  e u  
BOOL CCaptureDlg::RegisterHotkey() [L+*pW+$\.  
{ 3UUdJh<~  
 UpdateData(); L=#NUNiXr  
 UCHAR mask=0; l9f_NJHo  
 UCHAR key=0; ;|vP|Xi  
 if(m_bControl) e El)wZ,A  
  mask|=4; F `o9GLxM}  
 if(m_bAlt) wvq4 P  
  mask|=2; i6KfH\{N  
 if(m_bShift) z+yq%O  
  mask|=1; @??3d9I  
  key=Key_Table[m_Key.GetCurSel()]; R#hy2kA  
 if(bRegistered){ "HJ^>%ia  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); F^gTID  
  bRegistered=FALSE; i1uoYb?4(I  
 } 7G_<+rn  
 cMask=mask; cRf F!EV  
 cKey=key; 9PKXQp  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); G"?7 Z&+  
 return bRegistered; 7_2D4CI  
} VP A+/5TW  
vIJ5iLF  
  四、小结 !*:g??[T  
Ge`7`D>L  
  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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