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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: }"%!(rx  
  M(;y~ |e  
  一、实现方法 %gV)arwK  
q;~R:}?@  
  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: bGGeg%7  
4B:\  
#pragma data_seg("shareddata") &57qjA ,8<  
HHOOK hHook =NULL; //钩子句柄 sow bg<D  
UINT nHookCount =0; //挂接的程序数目 `!UaScM  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 vO}qjw  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Ap F*a$),  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey * ajFZI  
static int KeyCount =0; !7:EE,W~  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ~&wXXVK3  
#pragma data_seg() E@5zd@[  
`7u\   
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 kdK*MUB  
FX7Cjo#=R  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: (,- 5(fW  
g2[K<  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR L0X&03e=e:  
cKey,UCHAR cMask) ]uBT &  
{ F`YFo)W  
 BOOL bAdded=FALSE; X0^zw^2W  
 for(int index=0;index<MAX_KEY;index++){ S2koXg(  
  if(hCallWnd[index]==0){ p&k 0Rx0Q3  
   hCallWnd[index]=hWnd; 6obQ9L c  
   HotKey[index]=cKey; ucQezmie  
   HotKeyMask[index]=cMask; G*)s%2c>h  
   bAdded=TRUE; zrLhQ3V#>  
   KeyCount++; *)j@G:  
   break; (/T +Wpy?  
  } Nf=C?`L  
 } )x$!K[=  
 return bAdded; y-E1]4?})  
} z7'n, [  
//删除热键 ]sX7%3P  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) a='IT 5  
{ z{_mEE49  
 BOOL bRemoved=FALSE; 20 jrv'f  
 for(int index=0;index<MAX_KEY;index++){ S 3{Dn  
  if(hCallWnd[index]==hWnd){ 98D{{j92  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ X?KGb{  
    hCallWnd[index]=NULL; Y h^WTysBn  
    HotKey[index]=0; IL!BPFG w  
    HotKeyMask[index]=0; yQu vW$  
    bRemoved=TRUE; GYFgEg}  
    KeyCount--; Zr\2BOcc.l  
    break; fdd~e52f  
   } NY~ dM\  
  } w0#% AK  
 } V[#6yMU@  
 return bRemoved;  II.<SC  
} bq:wEMM4s  
jFgZ}Xp  
11i"nR|  
  DLL中的钩子函数如下: }=Hf?';m  
IetCMp  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) z VnIr<!8_  
{ c eqFQ  
 BOOL bProcessed=FALSE; E2>im>p  
 if(HC_ACTION==nCode) XZF%0g2$b  
 { 3wV86tH%  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ^it4z gx@  
   switch(wParam) F?!FD>L{`  
   {  BfX%|CWh  
    case VK_MENU: 0Wa#lkn$I  
     MaskBits&=~ALTBIT; 2}D,df'W4  
     break; @[n2dmj  
    case VK_CONTROL: Us1@\|]  
     MaskBits&=~CTRLBIT; !.9l4@z#  
     break; 5r'=O2AZX  
    case VK_SHIFT: A$/KP\0Y2  
     MaskBits&=~SHIFTBIT; ]a8eDy  
     break; g* %bzfk=|  
    default: //judge the key and send message Y3D3.T6Q  
     break; D5=C^`$2  
   } fW(;   
   for(int index=0;index<MAX_KEY;index++){ *zJD$+Fo  
    if(hCallWnd[index]==NULL) #]"/{Z  
     continue; 1Pu ,:Jt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Q?W r7  
    { ,Yo: &>As  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); x<8\-  
     bProcessed=TRUE; t9ER;.e  
    } "K 8nxnq  
   } _\p`4-.V  
  } /#29Y^Z)=  
  else if((lParam&0xc000ffff)==1){ //有键按下 wtlB  
   switch(wParam) [70Y,,w  
   { wbBE@RU>!  
    case VK_MENU: IT,"8 s  
     MaskBits|=ALTBIT; QDP-E[  
     break; SzRL}}I  
    case VK_CONTROL: 2%bhW,?I  
     MaskBits|=CTRLBIT; : g&>D#{  
     break; GX7VlI[  
    case VK_SHIFT: m{VL\ g)  
     MaskBits|=SHIFTBIT; SF0Jb"kS  
     break; m^ z,,t9  
    default: //judge the key and send message  /; +oz  
     break; 5Lw{0uLr  
   } 2ed@HJu  
   for(int index=0;index<MAX_KEY;index++){ d"Bo8`_  
    if(hCallWnd[index]==NULL) .Xi2G@D  
     continue; DQcWq'yY^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0(\p<qq  
    { .hxin [Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); q{/*n]K  
     bProcessed=TRUE; X+@s]  
    } =<Hy"4+?.  
   } ZHz^S)o\[s  
  } B .El a  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 FZeP<Ban  
   for(int index=0;index<MAX_KEY;index++){ U8E0~[y'  
    if(hCallWnd[index]==NULL) %z=`JhE"Q  
     continue; jn~!V!+ +  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %t q&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Kf|0*c  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 (s&ORoVGn  
   } g083J}08  
  } ^mAJ[^%  
 } Q Qi@>v|d  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2,+d|1(4o  
}  70{RDj6{  
@#A!w;bz  
  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: T=.-Cl1A  
QJQJR/g  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); D_Guc8*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >cTjA):  
R^uc%onP  
  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: ~bWhth2*  
1PmX." a  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) % ^e@`0L  
{ lelMt=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) SGQD ro=l  
 { Jlz9E|*qV  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ]/a g*F  
  SaveBmp(); 7O"hiDQ  
  return FALSE; ("b*? : B  
 } %Or2iuO%-,  
 …… //其它处理及默认处理 _nP)uU$  
} w\p9J0  
DDWp4`CS|  
[Q|M/|mnR1  
  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。 9Kx<\)-GMD  
*G\=i A  
  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。 >C:If0S4X  
EPv%LX_j  
  二、编程步骤 b1 H7  
Nvhy3  
  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"; =88t*dH(,"  
3Mur*tj#  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ERp{gB2U?  
w?*j dwh,'  
  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; ^zHRSO  
CGkI\E  
  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; 'P,,<nkr|  
?/)lnj)e{  
  5、 添加代码,编译运行程序。 Jb9F=s+  
~+=E"9Oo  
三、程序代码 UUGe"]V^g:  
YlrB@mE0n$  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL qZ&a76t  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) /-><k,mL?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ q P'[&h5Y  
#if _MSC_VER > 1000 Rh[Ibm56  
#pragma once vn``0!FX  
#endif // _MSC_VER > 1000 (m/aV  
#ifndef __AFXWIN_H__ =D}4X1l  
#error include 'stdafx.h' before including this file for PCH ~x\Cmu9`  
#endif Z~_8P  
#include "resource.h" // main symbols g9`[Y~  
class CHookApp : public CWinApp YQ+^  
{ loBtd%wY  
 public: O <>#>[  
  CHookApp(); vkuc8 li  
  // Overrides m!0N"AjA  
  // ClassWizard generated virtual function overrides ex!XB$X  
  //{{AFX_VIRTUAL(CHookApp) xb]o dYGdW  
 public: V!W1fb7V  
  virtual BOOL InitInstance(); (2d3jQN`  
  virtual int ExitInstance(); LfHzT<)|  
  //}}AFX_VIRTUAL SYeE) mI  
  //{{AFX_MSG(CHookApp) EQ/^&  
  // NOTE - the ClassWizard will add and remove member functions here. 95[wM6?J  
  // DO NOT EDIT what you see in these blocks of generated code ! 4 A5t*e  
  //}}AFX_MSG 16?C@` S>  
  DECLARE_MESSAGE_MAP() Ww=O=c5uOu  
}; /,LfA2^_j{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 3T?f5+@I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :6zC4Sr^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =},{8fZ4  
BOOL InitHotkey(); 'bC]M3P  
BOOL UnInit(); 8<{;=m8cQ  
#endif 5a6VMqQ6  
*<xrp*O  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 2uEhOi0I  
#include "stdafx.h" bQ"N ;d)e  
#include "hook.h" 6< >SHw  
#include <windowsx.h> |/*pT1(&  
#ifdef _DEBUG /LF3O~Go  
#define new DEBUG_NEW UUH;L  
#undef THIS_FILE fx]eDA|$e  
static char THIS_FILE[] = __FILE__; nc&Jmo7  
#endif HA1]M`&  
#define MAX_KEY 100 O) 1E$#~  
#define CTRLBIT 0x04 S+iP^*L,c  
#define ALTBIT 0x02 $o"g73`3  
#define SHIFTBIT 0x01 SOs,)  
#pragma data_seg("shareddata") A4 5m)wQ  
HHOOK hHook =NULL; Mc:b U  
UINT nHookCount =0; 3p&jLFphL  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ||XIWKF<n2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT nEyI t&> 9  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey SY|Ez!tU:N  
static int KeyCount =0; Je@kiE  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift kN.B/itvA  
#pragma data_seg() ^SAq^3^P!  
HINSTANCE hins; @/ k x er  
void VerifyWindow(); ULIFSd Y  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) gB >pd?d  
//{{AFX_MSG_MAP(CHookApp) H]]c9`ayt  
// NOTE - the ClassWizard will add and remove mapping macros here. ~z`/9 ;  
// DO NOT EDIT what you see in these blocks of generated code! eC;!YG Z  
//}}AFX_MSG_MAP J.W Ho c  
END_MESSAGE_MAP() T/NjNEd#  
LXNQb6!  
CHookApp::CHookApp() }PZ=`w*O  
{ 79wLT \&  
 // TODO: add construction code here, B=dseeG[To  
 // Place all significant initialization in InitInstance as#J qE  
} {+Sq<J_`M  
BGzO!s*@j  
CHookApp theApp; hlC%HA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]-a{IWVN  
{ FT( iX `YQ  
 BOOL bProcessed=FALSE; ZV( w  
 if(HC_ACTION==nCode) l&Q!mU}  
 { wV:C<Mg7q  
  if((lParam&0xc0000000)==0xc0000000){// Key up jtCZfFD?  
   switch(wParam) `kPc!I7Y  
   { vhpvO >Q  
    case VK_MENU: 0bSz4<}  
     MaskBits&=~ALTBIT; :u-.T.zZl  
     break; ) $#(ZL^m  
    case VK_CONTROL: iadkH]w  
     MaskBits&=~CTRLBIT; Ihqs%;V  
     break; ${>DhfF  
    case VK_SHIFT: ?:/|d\,7@  
     MaskBits&=~SHIFTBIT; \8>oJR 6  
     break; K}K)`bifw  
    default: //judge the key and send message -TS? fne)  
     break; n`.#59-Hx  
   } si?HkJv5  
   for(int index=0;index<MAX_KEY;index++){ t%$@fjz  
    if(hCallWnd[index]==NULL) 'F7VM?HBfg  
     continue; 11{y}J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !^L-T?y.2  
    { Jn#K0( FQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `pm>'  
     bProcessed=TRUE; ;RHNRVP  
    } e "n|jRh  
   } v ): V  
  } Gkmsaf>  
  else if((lParam&0xc000ffff)==1){ //Key down "lrA%~3%[P  
   switch(wParam) N,|r1u9X#  
   { A?,A( -0C  
    case VK_MENU: $:;%bjSI  
     MaskBits|=ALTBIT; l[*sHi  
     break; rN#\AN  
    case VK_CONTROL: a:}E& ,&M  
     MaskBits|=CTRLBIT; ?wCs&tM  
     break; |[LE9Lq/  
    case VK_SHIFT: jyQVSQ s  
     MaskBits|=SHIFTBIT; K(OaW)j  
     break; Y 1y E  
    default: //judge the key and send message l#xw.2bo  
     break; Xm@aYNV  
   } m[rL\](-  
   for(int index=0;index<MAX_KEY;index++) eEP( ).  
   { SH=:p^J  
    if(hCallWnd[index]==NULL) =~J fVozU  
     continue; JO}?.4B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Noz&noq  
    { 9|3o<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Z Xb}R^O-  
     bProcessed=TRUE; Y|RdzC M  
    } |X3">U +-  
   } On%,l  
  } lwJipIO  
  if(!bProcessed){ 8K^f:)Qw  
   for(int index=0;index<MAX_KEY;index++){ aDveU)]=1  
    if(hCallWnd[index]==NULL) n_P(k-^U*  
     continue; }p{;^B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *8UYSA~v  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); G=cNzr9  
   } OoM_q/oI  
  } c[:Wf<% |  
 } !g2a|g   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); oyW00]ka  
} &^+3er rO  
u`6/I#q`  
BOOL InitHotkey()  i6 L  
{ F`srE6H  
 if(hHook!=NULL){ EneAX&SG  
  nHookCount++; *l-`<.  
  return TRUE; m^A]+G#/  
 } )Mi'(C;  
 else ` FxtLG,F  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); U`1l8'W}:#  
  if(hHook!=NULL) 4+Ti7p06&\  
   nHookCount++; blp=Hk  
  return (hHook!=NULL); BKZ v9  
} v.b5iv5  
BOOL UnInit() 0!_*S )  
{ tBv3~Of.  
 if(nHookCount>1){ ETm]o  
  nHookCount--; D$hQyhz'  
  return TRUE; b pp*  
 } u~}%1  
 BOOL unhooked = UnhookWindowsHookEx(hHook); _:%U_U  
 if(unhooked==TRUE){ !0Nf9  
  nHookCount=0; Mj'lASI  
  hHook=NULL; =GTD"*vwr  
 } _[JkJwPTx  
 return unhooked; ; 8E;  
} :'Xr/| s  
:x+ig5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <m1sSghg  
{ k/bque  
 BOOL bAdded=FALSE; 6w!e?B2/%  
 for(int index=0;index<MAX_KEY;index++){ L=m:/qQL  
  if(hCallWnd[index]==0){  "l2bx  
   hCallWnd[index]=hWnd; ]#5^&w)'  
   HotKey[index]=cKey; 5[<F_"x  
   HotKeyMask[index]=cMask; oZ-FF'  
   bAdded=TRUE; GA ik;R  
   KeyCount++; 8f-:d]  
   break; ;dOs0/UM&  
  } Mciq-c)  
 } JCcQd 01z  
 return bAdded; {,Fcd(MU  
} r{Z[xWIX  
SB1[jcJ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) zDd5cxFdZ  
{ X'@f"=v9k  
 BOOL bRemoved=FALSE; hHEPNR[.  
 for(int index=0;index<MAX_KEY;index++){ 9 `INC~h  
  if(hCallWnd[index]==hWnd){ z5pc3:  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~<eVl l=  
    hCallWnd[index]=NULL; oAnigu;  
    HotKey[index]=0; SUc6/'Rdr  
    HotKeyMask[index]=0; `Hd9\;NJ  
    bRemoved=TRUE; ]ViOr8u  
    KeyCount--; iD`k"\>9  
    break; 8nsZ+,@+[  
   } ]738Z/)^  
  } 3cHtf  
 } M5 `m.n<  
 return bRemoved; ^]7,1dH}M  
} x;mJvfX  
]?&H^"=  
void VerifyWindow() _NT[ ~M_Q  
{ "Y(^F bs  
 for(int i=0;i<MAX_KEY;i++){ quRPg)  
  if(hCallWnd!=NULL){ C Oa.xyp  
   if(!IsWindow(hCallWnd)){ ^Xa*lR 3  
    hCallWnd=NULL; O%VA)<  
    HotKey=0; 'z-D%sCA  
    HotKeyMask=0; '%ebcL  
    KeyCount--; Efvq?cG&  
   } ~?-qZ<9/  
  } ctK65h{Eo  
 } )2]a8JVf  
} RF!'K ko  
ZYDW v/u  
BOOL CHookApp::InitInstance() ]<+3Vw  
{ e2bLkb3c  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); D2)i3vFB  
 hins=AfxGetInstanceHandle(); _ .!aBy%xf  
 InitHotkey(); .<dOED{v  
 return CWinApp::InitInstance(); /sV?JV[t  
} K9*IA@xL  
6W:1>,xS  
int CHookApp::ExitInstance() #!L%J<MX  
{ fa yKM  
 VerifyWindow(); W]@6=OpH  
 UnInit(); yXrd2?Rq@  
 return CWinApp::ExitInstance(); P>fKX2eQ-  
} Wz5=(<{S  
-_HRqw,Z0  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file j9>TTgy@  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) wB 2}uk7  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ =+4 _j  
#if _MSC_VER > 1000 Hh@2m\HA  
#pragma once "4RQ`.S R  
#endif // _MSC_VER > 1000 }>,CUz  
p>&S7M/9  
class CCaptureDlg : public CDialog  -tMA  
{ b@!:=_Mr  
 // Construction *7_@7=W,  
 public: F:,#?  
  BOOL bTray; ZqFUPHc  
  BOOL bRegistered; 8(^ ,r#Gy  
  BOOL RegisterHotkey(); u6pIdt  
  UCHAR cKey; c(CJ{>F%  
  UCHAR cMask; ?y46o2b*)  
  void DeleteIcon(); 4@mso+tk  
  void AddIcon(); /L$NE$D} "  
  UINT nCount; r*]uR /Z$  
  void SaveBmp(); 8 #Fh>  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Wxc^_iqA1  
  // Dialog Data h&P {p _Y  
  //{{AFX_DATA(CCaptureDlg) 4a?r` '  
  enum { IDD = IDD_CAPTURE_DIALOG }; Gn[*?=Vy  
  CComboBox m_Key; z 7@ 'CJ  
  BOOL m_bControl; @ce3%`c_  
  BOOL m_bAlt; 58PKx5`D  
  BOOL m_bShift; ve~C`2=;  
  CString m_Path; (Wn "3 ]  
  CString m_Number; l<Lz{)OR  
  //}}AFX_DATA ?l>e75V%w  
  // ClassWizard generated virtual function overrides Y!aLf[x]  
  //{{AFX_VIRTUAL(CCaptureDlg) 7g8B'ex J  
 public: &#Wkww&Y  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Bqp&2zg)@  
 protected: w0X$rl1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support > R#9\/s  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Stt* 1gT  
  //}}AFX_VIRTUAL g*28L[Q~  
  // Implementation }`#B f  
 protected: t +J)dr  
  HICON m_hIcon; zG<0CZQ8  
  // Generated message map functions "!^c  
  //{{AFX_MSG(CCaptureDlg) a 1NCVZ  
  virtual BOOL OnInitDialog(); C?S~L5a#oC  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); u,\xok"  
  afx_msg void OnPaint(); (c<f<D|  
  afx_msg HCURSOR OnQueryDragIcon(); xp(mB7;:  
  virtual void OnCancel(); HI z9s4Y_  
  afx_msg void OnAbout(); ZRUh/<\[  
  afx_msg void OnBrowse(); [C2kK *JZ  
  afx_msg void OnChange(); }pt-q[s>  
 //}}AFX_MSG J7_8$B-j7  
 DECLARE_MESSAGE_MAP() c9|I4=_K  
}; "`[$&:~  
#endif O8iu+}]/6  
XA?WUR[e  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `k!UjO72  
#include "stdafx.h" (%.</|u  
#include "Capture.h" EtJD'&  
#include "CaptureDlg.h" F-$Kv-f  
#include <windowsx.h> }~V,_Fv  
#pragma comment(lib,"hook.lib") Xa>}4j.  
#ifdef _DEBUG `TOX1cmw  
#define new DEBUG_NEW NPP3 (3C  
#undef THIS_FILE +H[Q~P8'[  
static char THIS_FILE[] = __FILE__; H8( C>w-'  
#endif %@o&*pF^,  
#define IDM_SHELL WM_USER+1 C9GU6Ao  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); tjt=N\;  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); sBbL~ce50?  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; % 6"o8  
class CAboutDlg : public CDialog 2}597Hb   
{  H RWZ0 '  
 public: juR  
  CAboutDlg(); 1O|RIv7F[/  
  // Dialog Data "i}Z(_7yr  
  //{{AFX_DATA(CAboutDlg) X4XFu  
  enum { IDD = IDD_ABOUTBOX }; #DrZ`Aq  
  //}}AFX_DATA WT I'O  
  // ClassWizard generated virtual function overrides O~nBz):2  
  //{{AFX_VIRTUAL(CAboutDlg) .0?ss0~  
 protected: >\RDQ%z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]<Z&=0i#9  
  //}}AFX_VIRTUAL 9t.fij  
  // Implementation Hxj'38Y  
 protected: O\3r%=TF  
  //{{AFX_MSG(CAboutDlg) LR hP7D+A  
  //}}AFX_MSG }rFThI  
  DECLARE_MESSAGE_MAP() w/hh 4ir  
}; 6vMDm0sv  
Z3Bo@`&?  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) (/To?`  
{ wVlSjk  
 //{{AFX_DATA_INIT(CAboutDlg) fMgcK$  
 //}}AFX_DATA_INIT 4V!1/w  
} zsHG= Ee*  
M}R@ K;%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 8+=p8e~An  
{ yY-FL`-  
 CDialog::DoDataExchange(pDX); []^PJ  
 //{{AFX_DATA_MAP(CAboutDlg) fma tc#G  
 //}}AFX_DATA_MAP WT;.>F  
} XCKY xv&  
cw*(L5b u  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *pDXcURw  
 //{{AFX_MSG_MAP(CAboutDlg) |TC3*Y  
 // No message handlers V]+o)A$  
 //}}AFX_MSG_MAP mjWp8i  
END_MESSAGE_MAP() g%@]z8L  
[_B+DD=}  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 8L%%eM_O  
: CDialog(CCaptureDlg::IDD, pParent) ;a#}fX  
{ "US" `a2  
 //{{AFX_DATA_INIT(CCaptureDlg) e5]&1^+  
  m_bControl = FALSE; 4W[AXDS  
  m_bAlt = FALSE; C}t+t  
  m_bShift = FALSE; *>?):-9"6N  
  m_Path = _T("c:\\"); ;LwFbkOuU  
  m_Number = _T("0 picture captured."); Vp5V m  
  nCount=0; ;9 =}_h)]  
  bRegistered=FALSE; QwKky ^A  
  bTray=FALSE; PR48~K,?  
 //}}AFX_DATA_INIT CnM+HN30o  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 n0Qh9*h  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); CpBQ>!CW  
} ~}hba3&b;#  
~{52JeUcP  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) !gD 3CA  
{ '8]|E  
 CDialog::DoDataExchange(pDX); &!H~bzg  
 //{{AFX_DATA_MAP(CCaptureDlg) g~bf!  
  DDX_Control(pDX, IDC_KEY, m_Key); BH.:_Qrbh[  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); I,?Fqg'sq  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9n06n$F  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); P wt ?9I  
  DDX_Text(pDX, IDC_PATH, m_Path); <k!mdj)  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ; 'b!7sMO~  
 //}}AFX_DATA_MAP hfl%r9o  
} 5`OK-  
6E)uu; 8  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) hY4)W  
//{{AFX_MSG_MAP(CCaptureDlg) jQH5$  
 ON_WM_SYSCOMMAND() =B3!jir  
 ON_WM_PAINT() FFD*e-i  
 ON_WM_QUERYDRAGICON() GU;TK'Yy?  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) j SUAU}u!M  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) *il]$i  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 0ECO/EuCg  
//}}AFX_MSG_MAP n $D}0wSM/  
END_MESSAGE_MAP() XL"v21X  
es*_Oo1  
BOOL CCaptureDlg::OnInitDialog() s>9z+;~!  
{ %l9WZ*yZ`2  
 CDialog::OnInitDialog(); X r  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Z L6~Eut  
 ASSERT(IDM_ABOUTBOX < 0xF000); :N+K^gI)  
 CMenu* pSysMenu = GetSystemMenu(FALSE); p``;!3~ ~  
 if (pSysMenu != NULL) Sop Ntcu!  
 { Vsm%h^]d  
  CString strAboutMenu; 5 b#" G"  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?%8})^Dd>4  
  if (!strAboutMenu.IsEmpty()) Q(!}t"u  
  { Kq@m?h  
   pSysMenu->AppendMenu(MF_SEPARATOR); [Ls2k&)0  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); )Rm 'YmO  
  } :yFTaniJ'.  
 } g:uaI  
 SetIcon(m_hIcon, TRUE); // Set big icon ctwhfS|Y0  
 SetIcon(m_hIcon, FALSE); // Set small icon + !E{L  
 m_Key.SetCurSel(0); f:JYG]E&  
 RegisterHotkey(); ZmR[5 mv@  
 CMenu* pMenu=GetSystemMenu(FALSE); OyG_thX  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 7E\K!v_  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); n+RUPZ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {Vt^Xc  
 return TRUE; // return TRUE unless you set the focus to a control >? A `C!i  
} w# gU1yu  
z9);e8ck  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 8h@)9Q]d\  
{ Ztpm_P6  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ;s!ns N  
 { TGt1d  
  CAboutDlg dlgAbout; .SKNIct M  
  dlgAbout.DoModal(); ; ei<Q =[  
 } !lt\2Ae  
 else `|ck5DZT5L  
 { 6S+K*/w  
  CDialog::OnSysCommand(nID, lParam); hsQrd%{f  
 } ;'WzfJ!q  
} -Uhl9 =  
q!9v}R3(  
void CCaptureDlg::OnPaint() v|,[5IY  
{ "k_n+cH%  
 if (IsIconic()) ^S;RX*  
 { J}Z_.:JO(w  
  CPaintDC dc(this); // device context for painting DbNi;m  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); J*q=C%}.  
  // Center icon in client rectangle nV,{w4t+  
  int cxIcon = GetSystemMetrics(SM_CXICON); HLyFyv\  
  int cyIcon = GetSystemMetrics(SM_CYICON); hAxuZb7 ?  
  CRect rect; ^&Rxui  
  GetClientRect(&rect); T$N08aju#  
  int x = (rect.Width() - cxIcon + 1) / 2; _QOOx+%*5  
  int y = (rect.Height() - cyIcon + 1) / 2; Ymk4Cu.s  
  // Draw the icon 9'/|?I  
  dc.DrawIcon(x, y, m_hIcon); #QyK?i*  
 } G~iYF(:&  
 else q3pN/f;kr,  
 { r* /XB0  
  CDialog::OnPaint(); p#8LQP~0$  
 } P20]>Hg  
} 0F0(]7g^  
l_q>(FoqA  
HCURSOR CCaptureDlg::OnQueryDragIcon() ;P0Y6v3  
{ ,ov v  
 return (HCURSOR) m_hIcon; (J;zkb  
} E 4$h%5  
5 1CU@1Ie  
void CCaptureDlg::OnCancel() WNlSve)]ie  
{ lh(+X-}D  
 if(bTray) J^+$L"K  
  DeleteIcon(); T~ q'y~9o  
  CDialog::OnCancel(); >-@{vyoOy  
} % OfDTs  
b]qfcV  
void CCaptureDlg::OnAbout() />2$ XwP  
{ N mjBJ_G  
 CAboutDlg dlg; OTtanJ?  
 dlg.DoModal(); @ vYN7  
} ZX5A%`<M  
9{^B Tc  
void CCaptureDlg::OnBrowse() :7PSZc:xE  
{ ;x0KaFk  
 CString str; H7XxME  
 BROWSEINFO bi; +Tc(z{;  
 char name[MAX_PATH]; <"|<)BGeI  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); {msB+n~WZ  
 bi.hwndOwner=GetSafeHwnd(); "a`0w9Mm}  
 bi.pszDisplayName=name; *,XJN_DKj  
 bi.lpszTitle="Select folder"; s:Ql](/B#  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; r1[T:B'  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); MzW$Sl&:  
 if(idl==NULL) nKa ;FaJ  
  return; ZWe$(?  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); -_f0AfU/a  
 str.ReleaseBuffer(); #uw*8&%0  
 m_Path=str; fdEj#Ux<H  
 if(str.GetAt(str.GetLength()-1)!='\\') g:e8i~  
  m_Path+="\\"; K|J#/  
 UpdateData(FALSE); @j8L{FGnN  
} &7kSLat+9{  
sbiDnRf  
void CCaptureDlg::SaveBmp() rJ~(Xu>,s  
{ Fe2 -;o  
 CDC dc; }m lbN0v  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); xXh]z |  
 CBitmap bm; kC#B7*[RM  
 int Width=GetSystemMetrics(SM_CXSCREEN); Ex&RR< 5  
 int Height=GetSystemMetrics(SM_CYSCREEN); (i~%4w=  
 bm.CreateCompatibleBitmap(&dc,Width,Height); D '_#?%3^  
 CDC tdc; eMd1%/[  
 tdc.CreateCompatibleDC(&dc); ~~E=E;9  
 CBitmap*pOld=tdc.SelectObject(&bm); 8; N}d)*O  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); owVUL~  
 tdc.SelectObject(pOld); ] j?Fk$C  
 BITMAP btm; |0 pBBDw  
 bm.GetBitmap(&btm); UY& W]  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {$eZF_}Y^  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ?[fl$EG  
 BITMAPINFOHEADER bih; Uz8C!L ">C  
 bih.biBitCount=btm.bmBitsPixel; Vm8_ !$F  
 bih.biClrImportant=0; WaK{/6?T,  
 bih.biClrUsed=0; }Ml z\'{  
 bih.biCompression=0;  ]mU*Y:<  
 bih.biHeight=btm.bmHeight; L=Jk"qWV0  
 bih.biPlanes=1; "'dC>7*<  
 bih.biSize=sizeof(BITMAPINFOHEADER); >t<R6f_Q0  
 bih.biSizeImage=size; qpH-P8V   
 bih.biWidth=btm.bmWidth; (Jr;:[4XC  
 bih.biXPelsPerMeter=0; v+2q R0,LM  
 bih.biYPelsPerMeter=0; Oes+na'^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); N P(?[W  
 static int filecount=0; }z 2-|"H  
 CString name; [eik<1=,~?  
 name.Format("pict%04d.bmp",filecount++); 'GO..m"G  
 name=m_Path+name; ,O`*AzjS5Q  
 BITMAPFILEHEADER bfh; QO^X7A"?X  
 bfh.bfReserved1=bfh.bfReserved2=0; rca"q[,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); !Y i<h/:  
 bfh.bfSize=54+size; Iur} ZAz  
 bfh.bfOffBits=54; v%e"4:K}?  
 CFile bf; 8@#Y <{  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ o;P;=<  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); DL Q`<aU  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }XE/5S}D  
  bf.WriteHuge(lpData,size); O g~"+IGp  
  bf.Close(); {8Nd-WJ{  
  nCount++; XD>@EYN<X  
 } 1pr_d"#4  
 GlobalFreePtr(lpData); W n mRRq^  
 if(nCount==1) qq{N; C  
  m_Number.Format("%d picture captured.",nCount); qk"=nAJX  
 else &otgN<H9  
  m_Number.Format("%d pictures captured.",nCount); i58CA?  
  UpdateData(FALSE); Yx/~8K_%M?  
} .`=PE&xq  
 } R6h  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) j_<n~ri-  
{ D[y|y 3F  
 if(pMsg -> message == WM_KEYDOWN) j[eEyCW[)  
 { b,A1(_pzi  
  if(pMsg -> wParam == VK_ESCAPE) 5Rp2O4Z  
   return TRUE; tzN;;h4C  
  if(pMsg -> wParam == VK_RETURN) !{0!G  
   return TRUE; z,P7b]KVe  
 } O|m-k0n  
 return CDialog::PreTranslateMessage(pMsg); dgD%I  
} ';V+~pi  
c$z_Zi!g#  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) LJ#P- `!{&  
{ e-meUf9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ];]EK6dzG  
  SaveBmp(); ![n`n(oN  
  return FALSE; FaM~ 56Pa  
} iB_j*mX]  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ A| -\C$  
 CMenu pop; e5]0<s$  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 7FFYSv,[:  
 CMenu*pMenu=pop.GetSubMenu(0); }7v2GfEkM  
 pMenu->SetDefaultItem(ID_EXITICON); Q{-r4n|b  
 CPoint pt; a5&j=3)|  
 GetCursorPos(&pt); g >oLc6T  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =h!m/f^x  
 if(id==ID_EXITICON) oOz6Er[KO  
  DeleteIcon(); [uHI 6Q#  
 else if(id==ID_EXIT) 5q >u }J  
  OnCancel(); zvj >KF|y  
 return FALSE; Vs{sB*:  
} V(0[QA  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Or|LyQU  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) )Ggx  
 AddIcon(); ;zG|llX  
 return res; *?'T8yf^  
} sl 5wX  
+w5?{J  
void CCaptureDlg::AddIcon() 2>s;xZ@/'R  
{ ugP R)tDfM  
 NOTIFYICONDATA data; ?A>-_B  
 data.cbSize=sizeof(NOTIFYICONDATA); *k$&Hcr$  
 CString tip;  i9"1  
 tip.LoadString(IDS_ICONTIP); \_'pUp22  
 data.hIcon=GetIcon(0); 9-SXu lgu  
 data.hWnd=GetSafeHwnd(); &YMj\KmlSg  
 strcpy(data.szTip,tip); O}V2> W$  
 data.uCallbackMessage=IDM_SHELL; S3f BZIPp  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; UW3F)  
 data.uID=98; Bnv%W4  
 Shell_NotifyIcon(NIM_ADD,&data); R4;6Oi)  
 ShowWindow(SW_HIDE); lHXH03  
 bTray=TRUE; zYsGI<4  
} q[ZYlF,Ho  
}J`Gm  
void CCaptureDlg::DeleteIcon() j!rz@Y3  
{ )-oNy-YL  
 NOTIFYICONDATA data; Sm5"Q  
 data.cbSize=sizeof(NOTIFYICONDATA); \266N;JrN  
 data.hWnd=GetSafeHwnd(); #>'0C6Xn  
 data.uID=98; /-lmfpT  
 Shell_NotifyIcon(NIM_DELETE,&data); 2F(j=uV+  
 ShowWindow(SW_SHOW); v/dcb%  
 SetForegroundWindow(); m|[ Hhw=f  
 ShowWindow(SW_SHOWNORMAL); |/$#G0X;H  
 bTray=FALSE; 3u<2~!sR  
} cs)hq4-L`  
2]wh1)  
void CCaptureDlg::OnChange() ]&>)=b!,  
{ #96a7K  
 RegisterHotkey(); ;Wdo*ysW  
} 40XI\yE_?  
I%Z &i-33y  
BOOL CCaptureDlg::RegisterHotkey() b`mEnI VIz  
{ Pc<ZfO #  
 UpdateData(); vvCGzOv  
 UCHAR mask=0; JAK*HA  
 UCHAR key=0; zZ63 P  
 if(m_bControl) [cq>QMW  
  mask|=4; W2^R$"U  
 if(m_bAlt) "cx" d:  
  mask|=2; m" Gr pE3  
 if(m_bShift) :&MiO3#+  
  mask|=1; 2S3F]fG0  
  key=Key_Table[m_Key.GetCurSel()]; B!0[LlF+  
 if(bRegistered){ y\x<!_&D  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Cpl)byb  
  bRegistered=FALSE; M-_)CR  
 } sr4K-|@  
 cMask=mask; ORNE>6J H  
 cKey=key; y-YYDEl  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); sQw-#f7t  
 return bRegistered; 2Xosj(H  
} Rk<:m+V=  
( _2eiE71  
  四、小结 5:wf"3%%  
_C?K;-v}  
  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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