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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: h%@#jvh?4  
  n?A;'\cK  
  一、实现方法 eM`"$xc Oe  
aA.TlG@zP  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: y<5xlN(+v  
uM~j  
#pragma data_seg("shareddata") .](s\6'  
HHOOK hHook =NULL; //钩子句柄 D$c4's `5  
UINT nHookCount =0; //挂接的程序数目 S-+^L|  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 meV RdQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 _26F[R1><~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ktKT=(F&  
static int KeyCount =0; hC =="4 -  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 x;R9Gc[5  
#pragma data_seg() <$ Ar*<,6  
Z?-l-s K  
  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。 T/C1x9=?  
W1J7$   
  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: (wIpq<%  
ouUU(jj02  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR \6${Na' \  
cKey,UCHAR cMask) c =i6  
{ n _*k e  
 BOOL bAdded=FALSE; )Hy|K1  
 for(int index=0;index<MAX_KEY;index++){ pc%_:>  
  if(hCallWnd[index]==0){ 1 {V*(=Tp  
   hCallWnd[index]=hWnd; xTL"%'|  
   HotKey[index]=cKey; SLc'1{  
   HotKeyMask[index]=cMask; WChJ <[]W  
   bAdded=TRUE; D*j\gI  
   KeyCount++; QRv2%^L  
   break; r yO\$m  
  } 4m6E~_:F  
 } F 'U G p  
 return bAdded; @YTZnGG*  
} bXiT}5mJU  
//删除热键 j7 D\O  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) zW^@\kB0D  
{ NUH#  
 BOOL bRemoved=FALSE; /P0%4aWu=  
 for(int index=0;index<MAX_KEY;index++){ cv["Ps#;`W  
  if(hCallWnd[index]==hWnd){ aNCIh@m~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Ol24A^  
    hCallWnd[index]=NULL; ,#r>#fi0  
    HotKey[index]=0; ""ICdZ_A  
    HotKeyMask[index]=0; PZ"=t!  
    bRemoved=TRUE; _`zj^*%  
    KeyCount--; 6F3#Rxh  
    break; Ui 7S8c#tH  
   } ^1S(6'a#  
  }  P-QZ=dm  
 } Vj"B#  
 return bRemoved; v }ZQC8wL  
} `:A`%Fg8<  
eJ#q! <   
l7P~_X_)"  
  DLL中的钩子函数如下: fNx3\<~V=  
dg 4 QA_"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) g%Ap<iT  
{ _S#uxgL<  
 BOOL bProcessed=FALSE; }4kd=]Nk  
 if(HC_ACTION==nCode) T0Q)}%L  
 { yA!#>u%g  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 B@l/'$G  
   switch(wParam) ;%AK< RT  
   {  [L,Tf_t^Y  
    case VK_MENU: ,r{\aW@  
     MaskBits&=~ALTBIT; u%S&EuX  
     break; yla&/K;|*  
    case VK_CONTROL: 70L{u+wIy  
     MaskBits&=~CTRLBIT; -lm\~VZT3  
     break; 0p_/eWww-  
    case VK_SHIFT: %@5f+5{i!z  
     MaskBits&=~SHIFTBIT; Qe=!'u.nL  
     break; `|;R}"R;  
    default: //judge the key and send message [= -?n6  
     break; <ok/2v  
   } %uyRpG3,  
   for(int index=0;index<MAX_KEY;index++){ YZdp/X6x  
    if(hCallWnd[index]==NULL) ^e>`ob  
     continue; ]v3 9ag_hu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tm(.a ?p  
    { O s@ d&wm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Bls\)$  
     bProcessed=TRUE; %9xz[Ng  
    } 41WnKz9c  
   } B`} ?rp  
  } QdL ;|3K9  
  else if((lParam&0xc000ffff)==1){ //有键按下 n97A'"'wz  
   switch(wParam) wz5xJ:Tj  
   { keEyE;O}u  
    case VK_MENU: 70l"[Y  
     MaskBits|=ALTBIT; &CFHH"OsT  
     break; /v E>*x  
    case VK_CONTROL: VAF+\Cea=  
     MaskBits|=CTRLBIT; ~&=-*  
     break; }N1Z7G  
    case VK_SHIFT: jx&pRjP  
     MaskBits|=SHIFTBIT; #z)@T  
     break; i3*S`/]p  
    default: //judge the key and send message " ;cWK29\f  
     break; nW3`Z1kq})  
   } z{cIG8z  
   for(int index=0;index<MAX_KEY;index++){ ]n0kO&  
    if(hCallWnd[index]==NULL) vW 0m%  
     continue; 6yKr5tH4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6e$(-ai  
    { wGE:U`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); cejSGsW6q  
     bProcessed=TRUE; C XZm/^  
    } n0kBLn  
   } -82Rz   
  } zo&'2I  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 _H|x6X1-  
   for(int index=0;index<MAX_KEY;index++){ &)OX*y  
    if(hCallWnd[index]==NULL) H3}{]&a  
     continue; 0x'>}5`5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?ZDXT2b~~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); pm,&kE  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ,L^eD>|j5  
   } xj iMM>|n  
  } !dYkvoQNn  
 } ad8kUHf  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); R}a,.C  
} Sve~-aG  
;=Jj{FoG%  
  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: Slcf=  
DHJh.Y@H  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); iTi<X|X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); IM}T2\tZ}  
{=j!2v#8~  
  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: a0Cf.[L  
.G#S*L  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) iV[g.sP-  
{ KD*,u{v;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) !9DqW&8  
 { ~S15tZ $  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 CeoK@y=o  
  SaveBmp(); "d>{hP  
  return FALSE; F_U3+J>  
 } `UL #g![J  
 …… //其它处理及默认处理 "?hEGJ;m"  
} F`3c uL[N  
dX: (%_Mn  
at${^,&  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 f@Rn&&-  
:f?\ mVS+  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 mdR:XuRD"t  
|S|0'C*  
  二、编程步骤 ~T9%%W[  
hV])\t=yf  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; G0Smss=K  
E8u :Fg s  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; }9 N, +*  
N\1!)b  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; &/}]9 #  
Xy:'f".M~\  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; y!;rY1  
_9wX8fh3D  
  5、 添加代码,编译运行程序。 G2U=*|  
A!No:?S  
三、程序代码 }:7'C. ."  
RxY ;'NY  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL -mOSB(#bo  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) A9ia[2[  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ wGD".CS0  
#if _MSC_VER > 1000 E!&A[TlX\  
#pragma once -bu.Ar-#;h  
#endif // _MSC_VER > 1000 bv$_t)Xh  
#ifndef __AFXWIN_H__ @T  
#error include 'stdafx.h' before including this file for PCH '+N!3r{G  
#endif 1w/1k6`0  
#include "resource.h" // main symbols }$s#H{T!  
class CHookApp : public CWinApp \dTX%<5D  
{ \R yOexNZ  
 public: FA<|V!a  
  CHookApp(); R<@s]xX_  
  // Overrides M5s>;q)  
  // ClassWizard generated virtual function overrides j|TcmZGO  
  //{{AFX_VIRTUAL(CHookApp) N}b/; Y  
 public: {v+,U}  
  virtual BOOL InitInstance(); \:-#,( .V  
  virtual int ExitInstance(); S(eCG2gR  
  //}}AFX_VIRTUAL P7O$*  
  //{{AFX_MSG(CHookApp) )1wC].RFYm  
  // NOTE - the ClassWizard will add and remove member functions here. 4eK!1|1  
  // DO NOT EDIT what you see in these blocks of generated code ! im|( 4 f  
  //}}AFX_MSG #\[h.4i  
  DECLARE_MESSAGE_MAP() a,tzt ]>  
}; lfp[(Ph)9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); &[$qA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); eRc+.m[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); IL`X}=L_  
BOOL InitHotkey(); G?CaCleG  
BOOL UnInit(); q,3_)ZOq  
#endif |9T3" _MmJ  
'=K [3%U  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. bhDV U(%I6  
#include "stdafx.h" ma[%,u`  
#include "hook.h" O*xC}$OOn  
#include <windowsx.h> u9My.u@-*%  
#ifdef _DEBUG A(G%9'T  
#define new DEBUG_NEW hJ$o+sl  
#undef THIS_FILE !|;^  
static char THIS_FILE[] = __FILE__; M3ihtY  
#endif 'g.9 goQ  
#define MAX_KEY 100 YyEW}2  
#define CTRLBIT 0x04 pQAG%i^mF  
#define ALTBIT 0x02 _jg&}HM  
#define SHIFTBIT 0x01 u :AKp<'  
#pragma data_seg("shareddata") xDU>y  
HHOOK hHook =NULL; lx$]f)%~  
UINT nHookCount =0; 'QW/TJ=7r  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 6x|"1 G{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ' RK .w^  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~sj'GEhEg  
static int KeyCount =0; CZ"~N`  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ?,uTH 4  
#pragma data_seg() _L 5<  
HINSTANCE hins; yW5/Y02  
void VerifyWindow(); f.8Jp<S2K  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) mW~t/$Y$  
//{{AFX_MSG_MAP(CHookApp) |^9+c2   
// NOTE - the ClassWizard will add and remove mapping macros here. 5Z"IM8?  
// DO NOT EDIT what you see in these blocks of generated code! G<n(\85X  
//}}AFX_MSG_MAP A2>rS   
END_MESSAGE_MAP() 4j^-n_T  
vFKX@wV S  
CHookApp::CHookApp() Otq`45  
{ z-};.!L^  
 // TODO: add construction code here, 6Y?%G>$6  
 // Place all significant initialization in InitInstance ]Hr:|2 |.  
} gq9IJ  
n${,r  
CHookApp theApp; -5;Kyio  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !lxs1!:  
{ QcQQQM  
 BOOL bProcessed=FALSE; -}avH  
 if(HC_ACTION==nCode) .,Q j3  
 { aDEz |>q  
  if((lParam&0xc0000000)==0xc0000000){// Key up >SRUC  
   switch(wParam) Tk~RT<\Ab+  
   { >Y,3EI\  
    case VK_MENU: JHQc)@E}  
     MaskBits&=~ALTBIT; =P'33) \ )  
     break; Sc!]M 5  
    case VK_CONTROL: ]gHxvT\E  
     MaskBits&=~CTRLBIT; _ nFsC  
     break; YDh6XD<Z  
    case VK_SHIFT: }xhat,9  
     MaskBits&=~SHIFTBIT; 5'iJN$7  
     break; mBW E^  
    default: //judge the key and send message oVi_X98R  
     break; 2y6@:VxSh  
   } T.ZPpxY  
   for(int index=0;index<MAX_KEY;index++){ ">pW:apl%  
    if(hCallWnd[index]==NULL) BCnf'0q  
     continue; F>N3GPRl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &G63ReW7 @  
    { x1H?e8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); MtE18m "z  
     bProcessed=TRUE; 9gjI;*(z1  
    } _<Hx1l~  
   } R}~p1=D  
  } WH:[Y7D  
  else if((lParam&0xc000ffff)==1){ //Key down fpMnA  
   switch(wParam) &qR1fbw"  
   { ]LGp3)T-  
    case VK_MENU: lIR0jgP@z  
     MaskBits|=ALTBIT; Q I!c=:u  
     break; nT7{`aaQl  
    case VK_CONTROL: [HEqMBX=;  
     MaskBits|=CTRLBIT; VjZ_L_U}  
     break; /rMxl(wD'  
    case VK_SHIFT: g~q+a-  
     MaskBits|=SHIFTBIT; ~vf&JH'!  
     break; z9> yg_Q  
    default: //judge the key and send message 9{OH%bF  
     break; Eu%19s; u  
   } CR*9-Y93  
   for(int index=0;index<MAX_KEY;index++) Cjvgf .>$  
   { $lJu2omi1  
    if(hCallWnd[index]==NULL) agQ5%t#  
     continue; 1-z*'Ghys  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9a.r(W[9  
    { NpmPm1Ix .  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Znl&.,c)  
     bProcessed=TRUE; X`,4pSQ;  
    } 5Gj?'Wov9  
   } _-NS-E  
  } 6 yIl)5/=  
  if(!bProcessed){ WW.\5kBl8  
   for(int index=0;index<MAX_KEY;index++){ L,@O OBD  
    if(hCallWnd[index]==NULL) c k~gB  
     continue; >)Ih[0~M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ONx|c'0g  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ,!`94{Ggv  
   } ]U :1N C"  
  } >{DHW1kF?  
 } fVR:m`'Iq_  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  eiLtZQ  
} $}[Tj0+:  
P1P P#>E-2  
BOOL InitHotkey() &&1q@m,cP  
{ Sr7+DCr  
 if(hHook!=NULL){ !*46@sb:  
  nHookCount++; >.R6\>N%  
  return TRUE; wp/u*g  
 } 4fDo}~  
 else ' pE %'8R  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); |pIA9/~Z  
  if(hHook!=NULL)  L_+0[A  
   nHookCount++; Dl862$_Q  
  return (hHook!=NULL); nMU#g])y)  
} 3t(8uG<rL  
BOOL UnInit() f;/t7=>d  
{ * *?mZtF  
 if(nHookCount>1){ >40B Fxc  
  nHookCount--; T;-Zl[H  
  return TRUE; "Y&+J@]  
 } r#{r]q_E*  
 BOOL unhooked = UnhookWindowsHookEx(hHook); tVx.J'"Y  
 if(unhooked==TRUE){ T7;)HFGeW  
  nHookCount=0; D\Y)E#%,  
  hHook=NULL; &`7~vA&c  
 } ':,6s  
 return unhooked; )k&pp^q\  
} ujcS>XN,1  
`92 D]^g  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ArkFC  
{ ixJUq o  
 BOOL bAdded=FALSE; -_jV.`t  
 for(int index=0;index<MAX_KEY;index++){ >/"XX,3  
  if(hCallWnd[index]==0){ %EPqJ(T  
   hCallWnd[index]=hWnd; bw*@0;  
   HotKey[index]=cKey; oH+UuP2a-J  
   HotKeyMask[index]=cMask; v9~Hl   
   bAdded=TRUE; [5%/{W,~m  
   KeyCount++; hp(n;(OR  
   break; m[^;HwJ  
  } =J8)Z'Jr  
 } .}fc*2.'  
 return bAdded; MCma3^/1  
} H+zn:j@~L  
\Rn.ug  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) AK<ZP?0  
{ x7e  
 BOOL bRemoved=FALSE; D} 0>x~  
 for(int index=0;index<MAX_KEY;index++){ :C42yQAP  
  if(hCallWnd[index]==hWnd){ )!dELS \ix  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <.3@-z>w2,  
    hCallWnd[index]=NULL; hoC}@8_  
    HotKey[index]=0; +N[dYm  
    HotKeyMask[index]=0; bcpH|}[F)  
    bRemoved=TRUE; Fga9  
    KeyCount--; @{_PO{=\C  
    break; o,) p*glO  
   } *9^CgLF  
  } f/)3b`$Wu  
 } Pi?*rr5WZ  
 return bRemoved; KGUpXMd^Z  
} v>3ctP {  
;J\{r$q  
void VerifyWindow() BN4dr9T  
{ )<.S 3  
 for(int i=0;i<MAX_KEY;i++){ pb%#`2"  
  if(hCallWnd!=NULL){ 3Gn2@`GC  
   if(!IsWindow(hCallWnd)){ 9BANCW"  
    hCallWnd=NULL; HkvCQH  
    HotKey=0; c7\bA7.  
    HotKeyMask=0; !U`T;\,v5  
    KeyCount--; p)ZlQ.d#Y  
   } ?l,i(I  
  } +bm2vIh$  
 } h Zlajky  
} (p} N9n$  
r"fu{4aX  
BOOL CHookApp::InitInstance() va8:QHdU  
{ uMsKF%m  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 7k6rhf7H  
 hins=AfxGetInstanceHandle(); S=aXmz<  
 InitHotkey(); ~Y)Au?d(a  
 return CWinApp::InitInstance(); qe(X5 ?#;  
} `j>qOT  
<O$'3 _S"D  
int CHookApp::ExitInstance() l%Sz6  
{ tzpGKhrk6  
 VerifyWindow(); jo<sN  
 UnInit(); N 5/TV%u  
 return CWinApp::ExitInstance(); 0'97af  
} =< CH(4!  
d; #9xD'  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Wc3!aLNx  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) |[34<tIN  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ #<'/s qL  
#if _MSC_VER > 1000 N83RsL "}_  
#pragma once :o}7C%Q8  
#endif // _MSC_VER > 1000 x6DH0*[.  
* n!0  
class CCaptureDlg : public CDialog hChM hc  
{ 6AQ;P  
 // Construction !Rb7q{@>  
 public: iBUf1v  
  BOOL bTray; }= <!j5:  
  BOOL bRegistered; t1Jz?Ix6%  
  BOOL RegisterHotkey(); M3z7P.\G  
  UCHAR cKey; ;? :,L  
  UCHAR cMask; >a4Bfnf"eI  
  void DeleteIcon(); zV80r+y  
  void AddIcon(); T@Q<oNU  
  UINT nCount; B!tt e )  
  void SaveBmp(); Ej34^*m9k  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor a|s=d  
  // Dialog Data [\.>BK  
  //{{AFX_DATA(CCaptureDlg) 0N T3  
  enum { IDD = IDD_CAPTURE_DIALOG }; ONfJ"Rp3  
  CComboBox m_Key; Z#J{tXZc  
  BOOL m_bControl; ' xi..  
  BOOL m_bAlt; '6WDs]\  
  BOOL m_bShift; rLKDeB  
  CString m_Path; WG}QLcP  
  CString m_Number; @pS[_!EqYz  
  //}}AFX_DATA d?{2A84S  
  // ClassWizard generated virtual function overrides '\_)\`a|  
  //{{AFX_VIRTUAL(CCaptureDlg) fglZjT  
 public: T8m%_U#b  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ZRQPOy  
 protected: !CMN/=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |y=gp  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); x< 3vA|o  
  //}}AFX_VIRTUAL Rw\DJJrz  
  // Implementation v Cmh3TQ  
 protected: mE7Jv)@  
  HICON m_hIcon; aEM#V  
  // Generated message map functions &GZR-/  
  //{{AFX_MSG(CCaptureDlg) O~Fk0}-  
  virtual BOOL OnInitDialog(); :YI>AaYWDO  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 9(PFd%  
  afx_msg void OnPaint(); k m|wB4  
  afx_msg HCURSOR OnQueryDragIcon(); $7bmUQ|  
  virtual void OnCancel(); CKR9APkv  
  afx_msg void OnAbout(); P<(mH=K  
  afx_msg void OnBrowse(); p-6.:y  
  afx_msg void OnChange(); z"vgwOP su  
 //}}AFX_MSG >5gzo6j/  
 DECLARE_MESSAGE_MAP() bG&qgbN>  
}; H5%I?ZXw4  
#endif Qv=Z  
_k@l-Bj  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file #FQVhgc  
#include "stdafx.h" 52 A=c1kb  
#include "Capture.h" R"=M5  
#include "CaptureDlg.h" |V7a26h  
#include <windowsx.h> (1HN, iJy  
#pragma comment(lib,"hook.lib") #3$|PM7,_  
#ifdef _DEBUG 0`thND)?O  
#define new DEBUG_NEW _ o(h]G1].  
#undef THIS_FILE lyeoSd1AN  
static char THIS_FILE[] = __FILE__; Y'~&%|9+T  
#endif c,fedH;  
#define IDM_SHELL WM_USER+1 18HHEW{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); u'b_zlW@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +~v(*s C  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; `j$d(+Gv  
class CAboutDlg : public CDialog l`]!)j|+  
{ M*H G4(n0  
 public: !Ch ya  
  CAboutDlg(); e_;6UZ+  
  // Dialog Data igL^k`&5^"  
  //{{AFX_DATA(CAboutDlg) /Rz,2jfRx'  
  enum { IDD = IDD_ABOUTBOX }; 6};oLnO  
  //}}AFX_DATA ou-;k }  
  // ClassWizard generated virtual function overrides /W>"G1)  
  //{{AFX_VIRTUAL(CAboutDlg) 7L6M#B[)e5  
 protected: ?n+\T'f!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support q<8HG_  
  //}}AFX_VIRTUAL Z}C%%2Iz  
  // Implementation aKy|$ {RC  
 protected: %G&v@R  
  //{{AFX_MSG(CAboutDlg) fpi6pcof  
  //}}AFX_MSG w6Q]?p+  
  DECLARE_MESSAGE_MAP() u5ygbCm  
}; ~k(Ez pn#  
qQ'@yTVN  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) $gTPW,~s[  
{ 5S? yj  
 //{{AFX_DATA_INIT(CAboutDlg) m t^1[  
 //}}AFX_DATA_INIT QMY4%uyY!  
} 1hWz%c|  
4{g|$@s(  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) qh 3f  
{ xL"% 2nf  
 CDialog::DoDataExchange(pDX); F)w83[5_d  
 //{{AFX_DATA_MAP(CAboutDlg) 8IH gsW";  
 //}}AFX_DATA_MAP I2T2'_I  
} k#&SWp=  
.#J3UZ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) co80M;4  
 //{{AFX_MSG_MAP(CAboutDlg) : \OvVS/  
 // No message handlers ~dLZ[6Z  
 //}}AFX_MSG_MAP 3\G=J  
END_MESSAGE_MAP() Hdx|k=-Q^  
' ^^K#f8  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) U*TN/6Qy.  
: CDialog(CCaptureDlg::IDD, pParent) ~4<3`l=A  
{ sCl,]g0{  
 //{{AFX_DATA_INIT(CCaptureDlg) IycxRig  
  m_bControl = FALSE; ,gc#N  
  m_bAlt = FALSE; cg%CYV)  
  m_bShift = FALSE; WU\bJ}  
  m_Path = _T("c:\\"); W|e>  
  m_Number = _T("0 picture captured."); ($W 5fbu  
  nCount=0; gEsR-A!m  
  bRegistered=FALSE; j[cjQ]>~'  
  bTray=FALSE; 1n"X?K5;A  
 //}}AFX_DATA_INIT &L]*]Xz;  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 !y?hn$w0  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); sQs5z~#51*  
} zOdKB2_J7  
sD +G+  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) E=NY{| >  
{ {SJ7Yfs  
 CDialog::DoDataExchange(pDX); ?< QFW#:)  
 //{{AFX_DATA_MAP(CCaptureDlg) BaAb4{  
  DDX_Control(pDX, IDC_KEY, m_Key); :nUsC+oBS  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); bicL %I2h  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Fw m:c[G  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); I "2FTGA  
  DDX_Text(pDX, IDC_PATH, m_Path); 5.#9}]  
  DDX_Text(pDX, IDC_NUMBER, m_Number); >}*jsqaVU  
 //}}AFX_DATA_MAP l)s+"C#  
} X~3P?O]kFv  
"n, ZP@M;  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) }8: -I Nj4  
//{{AFX_MSG_MAP(CCaptureDlg) :,,y63-f4  
 ON_WM_SYSCOMMAND() % cdP*  
 ON_WM_PAINT() Qu_T&  
 ON_WM_QUERYDRAGICON() hp4(f W  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) %Qz`SO8x?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;%alZ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) v6\2m c.  
//}}AFX_MSG_MAP 3+5\xRq  
END_MESSAGE_MAP() i%8&g2  
qL.Y_,[[  
BOOL CCaptureDlg::OnInitDialog() U(4_X[qD  
{ KBe {  
 CDialog::OnInitDialog(); ! hr@{CD  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (Nb1R"J `  
 ASSERT(IDM_ABOUTBOX < 0xF000); >L`mF_WG  
 CMenu* pSysMenu = GetSystemMenu(FALSE); nV*sdSt  
 if (pSysMenu != NULL) wR4u}gb#q  
 { j]O[I^5  
  CString strAboutMenu; ix@rq#  
  strAboutMenu.LoadString(IDS_ABOUTBOX); RgA4@J#  
  if (!strAboutMenu.IsEmpty()) jgw'MpQm{  
  { ]?$y}  
   pSysMenu->AppendMenu(MF_SEPARATOR); N-YZ0/c  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 2{Iz  
  } ^X%4@,AE  
 } d}cJ5 !d  
 SetIcon(m_hIcon, TRUE); // Set big icon ldvxYq<:  
 SetIcon(m_hIcon, FALSE); // Set small icon K0=E4>z,`q  
 m_Key.SetCurSel(0); Jjh!/pWZ4  
 RegisterHotkey(); &"%|`gE  
 CMenu* pMenu=GetSystemMenu(FALSE); 1/+r?F 3  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); R6mJFE*6T9  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); r~_ /Jj  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); an[~%vxw}  
 return TRUE; // return TRUE unless you set the focus to a control kQlcT"R  
} =w$"wzc  
?Hxgx  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) q.[[ c  
{ A!Ct,%   
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) k]9>V@C  
 { *js$r+4  
  CAboutDlg dlgAbout; W?J[K;<  
  dlgAbout.DoModal(); S_VncTIO  
 } -f|^}j?  
 else B2qq C-hw?  
 { .r%|RWs6W  
  CDialog::OnSysCommand(nID, lParam); S&]<;N_B  
 } |Umfq:W`y_  
} hcc-J)=m  
N/{Yi _n  
void CCaptureDlg::OnPaint() dS_)ll.6z  
{ {59VS Nl  
 if (IsIconic()) Mv`LF  
 { L9?/ -@M  
  CPaintDC dc(this); // device context for painting 2X c  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Rn_W|"  
  // Center icon in client rectangle lT!$\E$1   
  int cxIcon = GetSystemMetrics(SM_CXICON); x&oBO{LNK,  
  int cyIcon = GetSystemMetrics(SM_CYICON); ^_h7!=W  
  CRect rect; P^m 6di  
  GetClientRect(&rect); )r,R!8  
  int x = (rect.Width() - cxIcon + 1) / 2; &~A*(+S  
  int y = (rect.Height() - cyIcon + 1) / 2; maEpT43f  
  // Draw the icon IBNQmVRrI  
  dc.DrawIcon(x, y, m_hIcon); TIWLp  
 } %<#3_}"T|  
 else ^*ez j1  
 { @:QdCG+  
  CDialog::OnPaint(); (My$@l973  
 } )u)$ `a  
} a:^ Gr%  
}cK~=@7tK  
HCURSOR CCaptureDlg::OnQueryDragIcon() 8|qB 1fB  
{ C5PBfn<j  
 return (HCURSOR) m_hIcon; nC.2./OwMf  
} !v4j`A;%  
=*:_swd  
void CCaptureDlg::OnCancel() !"x7re  
{ xP6?es`  
 if(bTray) JrWBcp:Y  
  DeleteIcon(); jo3}]KC !  
  CDialog::OnCancel(); pH l2!{z  
} I&fh  
po2[uJ  
void CCaptureDlg::OnAbout() `CEj 4  
{ =>z tBw\  
 CAboutDlg dlg; <CKmMZ{  
 dlg.DoModal(); #!u51P1  
} g_U~.?Db7  
z>p`!-'ID  
void CCaptureDlg::OnBrowse() VMye5  P  
{ BS,5W]ervE  
 CString str; ,ibPSN5Ca  
 BROWSEINFO bi; jM1%6  
 char name[MAX_PATH]; ]F* a PV  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); CndgfOF  
 bi.hwndOwner=GetSafeHwnd(); 27 145  
 bi.pszDisplayName=name; ;!JX-Jq  
 bi.lpszTitle="Select folder"; fw|+7 O  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; oBNX8%5w  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); T'b/]&0Tio  
 if(idl==NULL) l*\~ew   
  return; 6^IqSNn-  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 'Ywpdzz[  
 str.ReleaseBuffer(); |*c\6 :  
 m_Path=str; o|;eMO-  
 if(str.GetAt(str.GetLength()-1)!='\\') =Wk/q_.  
  m_Path+="\\";  e_~fJ  
 UpdateData(FALSE); >AzWM .r  
} 7}cDGdr  
D@\;@( |  
void CCaptureDlg::SaveBmp() H9san5{  
{ |!?WQ[  
 CDC dc; s\C8t0C  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); it\DZGsg  
 CBitmap bm; D_n}p8blT  
 int Width=GetSystemMetrics(SM_CXSCREEN); ZAX0n!db3  
 int Height=GetSystemMetrics(SM_CYSCREEN); 6(J4IzZ  
 bm.CreateCompatibleBitmap(&dc,Width,Height); euj8p:+X  
 CDC tdc; *fH_lG%  
 tdc.CreateCompatibleDC(&dc); pba8=Z  
 CBitmap*pOld=tdc.SelectObject(&bm); ,c%K)KuPK.  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); $# !UGY  
 tdc.SelectObject(pOld); ;w6fM  
 BITMAP btm; %t~SOkx  
 bm.GetBitmap(&btm); O%JsUKV  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; EwD3d0udL  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); `kNi*I^  
 BITMAPINFOHEADER bih; )o9Q5Lq  
 bih.biBitCount=btm.bmBitsPixel; :K^gu%,&$  
 bih.biClrImportant=0; v"~Do+*+  
 bih.biClrUsed=0; K4k~r!&OU  
 bih.biCompression=0; M6jp1:ZH2q  
 bih.biHeight=btm.bmHeight; W[>iJJwz  
 bih.biPlanes=1; )v52y8G-p  
 bih.biSize=sizeof(BITMAPINFOHEADER); 4j@i%  
 bih.biSizeImage=size; \/*Nf?;  
 bih.biWidth=btm.bmWidth; 2T@L{ql  
 bih.biXPelsPerMeter=0; %/y`<lJz(  
 bih.biYPelsPerMeter=0; ;;?vgrz  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); cZgMA8 F  
 static int filecount=0; n|x$vgb  
 CString name; 7k] RO  
 name.Format("pict%04d.bmp",filecount++); l 70,Jo?78  
 name=m_Path+name; i>Fvmw  
 BITMAPFILEHEADER bfh; e`Co,>W/  
 bfh.bfReserved1=bfh.bfReserved2=0; 8wII{FHX  
 bfh.bfType=((WORD)('M'<< 8)|'B'); /BMtcCPG!  
 bfh.bfSize=54+size; x*h?%egB!p  
 bfh.bfOffBits=54; j1puB  
 CFile bf; -Aa]aDAz68  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /Fe:h >6  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); e2k4[V  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 79SqYe=&uy  
  bf.WriteHuge(lpData,size); @n7t?9Bx  
  bf.Close(); L\}Pzxn  
  nCount++; ]am~aJ|L  
 } 6X7s 4  
 GlobalFreePtr(lpData); g5[D&  
 if(nCount==1) ' :\fl.b  
  m_Number.Format("%d picture captured.",nCount); b4Cfd?'  
 else d /B'[Ur  
  m_Number.Format("%d pictures captured.",nCount); _)KY  
  UpdateData(FALSE); dh^+l;!L  
} IV{FH&t^T"  
[dj5 $l|  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) u R\m`  
{ PMgQxM*h  
 if(pMsg -> message == WM_KEYDOWN) IS[Vap:  
 { }xDB ~k  
  if(pMsg -> wParam == VK_ESCAPE) ~{kM5:-iw  
   return TRUE; / l".}S  
  if(pMsg -> wParam == VK_RETURN) Mo}H_8y  
   return TRUE; T&r +G!2  
 } N%9h~G  
 return CDialog::PreTranslateMessage(pMsg); 1$$37?FE  
} e,f ;  
W.A1m4l58R  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~{L.f94N  
{ J3B6X8P'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ =- $!:W~  
  SaveBmp(); CQdBf3q  
  return FALSE; +w"_$Tj@;  
} *Ph]F$ZP  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ dG&2,n'f  
 CMenu pop; "~u_\STn <  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); h|bqyu  
 CMenu*pMenu=pop.GetSubMenu(0); ,>;!%Ui/p  
 pMenu->SetDefaultItem(ID_EXITICON); 24|  
 CPoint pt; TH|?X0b  
 GetCursorPos(&pt); N-[n\}'  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); "JkZJ#  
 if(id==ID_EXITICON) C"6 Amnj  
  DeleteIcon(); L@w0N)P<!{  
 else if(id==ID_EXIT) )`w=qCn1Y  
  OnCancel(); Zta$R,[9h  
 return FALSE; <rNtY,  
} x6LjcRS|  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); KNy`Lj)VPY  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) [?-]PZ  
 AddIcon(); ;}LJh8_  
 return res; RfKc{V  
} hwiKOP  
HOE2*4r  
void CCaptureDlg::AddIcon() ibvJWg  
{ Aj,]n>{  
 NOTIFYICONDATA data; ],n%Xp  
 data.cbSize=sizeof(NOTIFYICONDATA); i 'qMi~{  
 CString tip; 8QV t, 'I  
 tip.LoadString(IDS_ICONTIP); < CDA"  
 data.hIcon=GetIcon(0); j"5Pe  
 data.hWnd=GetSafeHwnd(); xw?CMA  
 strcpy(data.szTip,tip); zK=dzoy  
 data.uCallbackMessage=IDM_SHELL; 3[VWTq)D=  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; b\?3--q  
 data.uID=98; qgtn5] A  
 Shell_NotifyIcon(NIM_ADD,&data); A8J8u,u9  
 ShowWindow(SW_HIDE); $,TGP+vH  
 bTray=TRUE; L?!$EPr  
} *ksb?|<Ot  
&.zj5*J  
void CCaptureDlg::DeleteIcon() Q:mZ" i5  
{ =yo{[&Jz  
 NOTIFYICONDATA data; L[rpb.'FG  
 data.cbSize=sizeof(NOTIFYICONDATA); @%c81rv?  
 data.hWnd=GetSafeHwnd(); j")FaIM  
 data.uID=98;  l^P#kQA  
 Shell_NotifyIcon(NIM_DELETE,&data); 9qpU@V!  
 ShowWindow(SW_SHOW); !#?8BwnaZ  
 SetForegroundWindow(); O}QFq14<+  
 ShowWindow(SW_SHOWNORMAL); Rp0|zP,5  
 bTray=FALSE; ! ao6e  
} H)E^!eo  
Km,*)X.-5  
void CCaptureDlg::OnChange() W2`.RF^  
{ 7,*%[#-HE  
 RegisterHotkey(); nTs/Q  V  
} i2*d+?Er  
p #bhz5&/  
BOOL CCaptureDlg::RegisterHotkey() %nWe,_PjD  
{ ~AQ>g#|%  
 UpdateData(); lV\lj@  
 UCHAR mask=0; 6UlF5pom  
 UCHAR key=0; 8V-,Xig;`  
 if(m_bControl) $Z ]z  
  mask|=4; >B_n/v3P(M  
 if(m_bAlt) #|Oj]bd(=  
  mask|=2; A[`G^ $  
 if(m_bShift) 4}i*cB `  
  mask|=1; H-(q#?:  
  key=Key_Table[m_Key.GetCurSel()]; )Vg2Jix,]  
 if(bRegistered){ < W*xshn  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); g`[`P@  
  bRegistered=FALSE; 7S<UFj   
 } X D)  8?  
 cMask=mask; Ra[>P _  
 cKey=key; dx@QWTNE  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 94Ud@F9d5  
 return bRegistered; *_1[[~Aw  
} \0ov[T N.>  
!,Nwts>m  
  四、小结 R"3 M[^  
'tm$q /&  
  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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