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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: (HN4g;{  
  '7im  
  一、实现方法 I}Xg &-L  
p&K\]l}  
  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: fH8!YQG8$  
".~{:=  
#pragma data_seg("shareddata") Ok%}|/ P4  
HHOOK hHook =NULL; //钩子句柄 u; TvS |  
UINT nHookCount =0; //挂接的程序数目 kYxS~Kd<  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 i3 )xX@3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 !|m9|  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey '?Iif#Z1  
static int KeyCount =0; (5uJZ!m  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 xnq><4  
#pragma data_seg() Z#Lx_*p]Q  
r[Zq3  
  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。 {sC=J hs-  
M} .b" ljZ  
  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: <kD#SV%"  
-0,4eg j3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR I*1S/o_xI  
cKey,UCHAR cMask) CM~MoV[k7e  
{ w&lZ42(mF  
 BOOL bAdded=FALSE; !g 0cC.'  
 for(int index=0;index<MAX_KEY;index++){ ]X" / yAn  
  if(hCallWnd[index]==0){ iG[? ]]  
   hCallWnd[index]=hWnd; <Ns &b.\h6  
   HotKey[index]=cKey; ~r`Wr`]_z  
   HotKeyMask[index]=cMask; < `Z%O<X  
   bAdded=TRUE; 3DoRE2}  
   KeyCount++; BQjam+u6  
   break; t^@T`2jL  
  } =wA5P@  
 } XS0V:<+,  
 return bAdded; H(\V+@~>AD  
} =[(1my7  
//删除热键 \mXqak,y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Gm&2R4)EP  
{ $ly0h W  
 BOOL bRemoved=FALSE; A'DVJ9%xB  
 for(int index=0;index<MAX_KEY;index++){ |R'i:=  
  if(hCallWnd[index]==hWnd){ xYR#%!M  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ dokuyiN\  
    hCallWnd[index]=NULL; Jqg3.2q  
    HotKey[index]=0; r69WD .  
    HotKeyMask[index]=0; aii'}c  
    bRemoved=TRUE; HP$K.a7H  
    KeyCount--; gNa#|  
    break; L<@&nx   
   } 3Hm7 uBZ  
  } YY!!<2_  
 } HIPL!ss]  
 return bRemoved; D9ywg/Q91  
} z^~U]S3  
@9_)On9hZ  
h>tsis'N9  
  DLL中的钩子函数如下: WLy7'3@  
{U P_i2`.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4qBY% 1  
{ f%1wMOzx  
 BOOL bProcessed=FALSE; s?<!&Y  
 if(HC_ACTION==nCode) U$$3'n  
 { s=\7)n=,M  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 o*)@oU  
   switch(wParam) Vw?P.4  
   {  B'/Icg.T  
    case VK_MENU: x9\J1\  
     MaskBits&=~ALTBIT; sbjtL,  
     break; 0nT%Slbih  
    case VK_CONTROL: 1Q_ ``.M  
     MaskBits&=~CTRLBIT; ;q&Z9 lm  
     break; |lHFo{8"  
    case VK_SHIFT: wL'C1Vr  
     MaskBits&=~SHIFTBIT; ;.r2$/E  
     break; vK`S!7x'&  
    default: //judge the key and send message Vd[  2u  
     break; |Rk37P {  
   } intvlki]be  
   for(int index=0;index<MAX_KEY;index++){ Wb'*lT0=  
    if(hCallWnd[index]==NULL) Obg@YIwn  
     continue; Lo5Jb6nm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =*[, *A  
    { Cd9t{pQD4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); g)nXo:)&  
     bProcessed=TRUE; F94V5_[  
    } U!_sh<  
   } =yo=q)W  
  } (S3jZ  
  else if((lParam&0xc000ffff)==1){ //有键按下 4Z],+?.[  
   switch(wParam) &F86SrsI  
   { =>.DD<g"  
    case VK_MENU: )e#fj+>x)  
     MaskBits|=ALTBIT; AtuZF  
     break; 4g S[D  
    case VK_CONTROL: IS .g);Gj  
     MaskBits|=CTRLBIT; i~(#S8U4d  
     break; [6tR&D #K  
    case VK_SHIFT: ?#U0eb5u  
     MaskBits|=SHIFTBIT; D@2Ya/c  
     break; Mn-<51.%  
    default: //judge the key and send message -uO%[/h;N  
     break; =tLU]  
   } xqU^I5Z  
   for(int index=0;index<MAX_KEY;index++){ il=?of\,i  
    if(hCallWnd[index]==NULL) uFMs ^^#  
     continue; !Q[;5Lqt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nz}]C04:-  
    { %+/f'6kR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); u;$I{b@M]  
     bProcessed=TRUE; .Y+mwvLpRG  
    } iM4mkCdOO  
   } p.qrf7N$  
  } tbL1g{Dz,  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ,ZLG7e  
   for(int index=0;index<MAX_KEY;index++){ iJ5e1R8tN  
    if(hCallWnd[index]==NULL) 3AX?B~s  
     continue; 27}.s0{D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) oM/B.U2a  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *G8'Fjin'T  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 E `?S!*jm  
   } %?U"[F1  
  } ~oEXM ?M  
 } clij|?O  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $IZ *|>(  
} ?z*W8b]'  
^!zJf7(+<>  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: yQ72v'  
J@=!w[v+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F#zQQ)(Pf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); F(0pru4u  
THegPD67J  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Y- z~#;  
1q;I7_{ 2  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) roK4RYJ7)  
{ P}w^9=;S  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ?h>(&H jWV  
 { CNpCe-%&  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 b}"vI Rz  
  SaveBmp(); S^_JC  
  return FALSE; RXCygPT   
 } K6 PC&+x  
 …… //其它处理及默认处理 IJL^dXCu  
} oW\Q>c7 =  
\!? PhNv  
FQv02V+&<  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 q[We][Nrzb  
C/grrw  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 z^SN#v$  
i&AXPq>`  
  二、编程步骤 A `H]q5d  
DVeF(Y3&  
  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"; qrORP3D@  
@i1.5z  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 3 8ls 4v3  
A=l?IC@O  
  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; ~h~r]tV*+  
*axza~d  
  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; PhI{3B/  
$[L)f| l  
  5、 添加代码,编译运行程序。 +L<w."WG  
P89Dg/P  
三、程序代码 }T^v7 LY  
8?]%Q i   
///////////////////////////////////// Hook.h : main header file for the HOOK DLL cmC&s'/8`D  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) kB!M[[t  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 5,I*F9[3  
#if _MSC_VER > 1000 +O%a:d%  
#pragma once GO&RR}  
#endif // _MSC_VER > 1000 wMR[*I/  
#ifndef __AFXWIN_H__ >O[^\H!\  
#error include 'stdafx.h' before including this file for PCH 2{Lc^6i(t  
#endif :EmMia-)J  
#include "resource.h" // main symbols O,z%7><  
class CHookApp : public CWinApp M4$4D?  
{ ,YuWz$aF{  
 public: 8Gzs  
  CHookApp(); K <fq=:I3  
  // Overrides pRyS8'  
  // ClassWizard generated virtual function overrides j4hUPL7  
  //{{AFX_VIRTUAL(CHookApp) -a#AE|`  
 public: S4AB tKG  
  virtual BOOL InitInstance(); -_H2FlB  
  virtual int ExitInstance(); V3Rnr8  
  //}}AFX_VIRTUAL 7H@Cy}a  
  //{{AFX_MSG(CHookApp) laIC}!  
  // NOTE - the ClassWizard will add and remove member functions here. %nK 15(  
  // DO NOT EDIT what you see in these blocks of generated code ! "q#kh,-C  
  //}}AFX_MSG W,eKQV<j  
  DECLARE_MESSAGE_MAP() & ;x1Rx  
}; #._6lESK  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); (/UMi,Ho  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); JT+lWhy  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,)\5O0 D6  
BOOL InitHotkey(); p9bxhnn|  
BOOL UnInit(); {;rpgc  
#endif TuhL :  
?&bVe__  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Q\th8/ /  
#include "stdafx.h" Yka yT0!  
#include "hook.h" 29E@e]Y,`  
#include <windowsx.h> ,'0oj$~S:  
#ifdef _DEBUG d}G."wnG9,  
#define new DEBUG_NEW t 1'or  
#undef THIS_FILE XhkL)) FcG  
static char THIS_FILE[] = __FILE__; AZ@Zo'  
#endif %>}7 $Y%  
#define MAX_KEY 100 Ud?d.  
#define CTRLBIT 0x04 vnOF$6n  
#define ALTBIT 0x02 lfG&V +S1  
#define SHIFTBIT 0x01 ]d;/6R+Vs  
#pragma data_seg("shareddata") uS10P7N}  
HHOOK hHook =NULL; =1B&d[3;  
UINT nHookCount =0; RJm8K,3#  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey &:{yf=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT w9h5f  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey u>Kvub  
static int KeyCount =0; #NxvLW/  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift &K*_/Q '\  
#pragma data_seg() m9i%U   
HINSTANCE hins; %R5MAs&-5  
void VerifyWindow(); ^mb*w)-p?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 5rSth.&  
//{{AFX_MSG_MAP(CHookApp) U.9nHo{  
// NOTE - the ClassWizard will add and remove mapping macros here. AxQ/  
// DO NOT EDIT what you see in these blocks of generated code! {oC69n:  
//}}AFX_MSG_MAP ~}l,H:jk@  
END_MESSAGE_MAP() O&RHCR-\  
@WE$%dr  
CHookApp::CHookApp() <qiap2  
{ nUu|}11(  
 // TODO: add construction code here, q.tL'  
 // Place all significant initialization in InitInstance / 1GZN *I  
} $f\-.7OD  
AH,F[ vS  
CHookApp theApp; wB GxJ\+M  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `215Llzk;  
{ T8oASg!  
 BOOL bProcessed=FALSE; id9T[^h  
 if(HC_ACTION==nCode) O&%T_Zk@@  
 { AY erz  
  if((lParam&0xc0000000)==0xc0000000){// Key up mw%_ yDZ{  
   switch(wParam) $~\qoW<  
   { Darkj>$\  
    case VK_MENU: c9={~  
     MaskBits&=~ALTBIT; 4x >e7Kf  
     break; T!E LH!  
    case VK_CONTROL: ,5WDYk-  
     MaskBits&=~CTRLBIT; 4h(Hy&1C  
     break; w+D5a VJ  
    case VK_SHIFT: 1(a\$Di  
     MaskBits&=~SHIFTBIT; `Nr7N#g+u  
     break; KfS^sT  
    default: //judge the key and send message ;c}];ZU3G  
     break; s*Ll\#  
   } =Q/i< u  
   for(int index=0;index<MAX_KEY;index++){ 7Kjq1zl;  
    if(hCallWnd[index]==NULL) ~:Nyv+g,$  
     continue; _FgeE`X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @x4Dt&:"  
    { p^!p7B`qe.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $T0[  
     bProcessed=TRUE; f{oWd]eAhb  
    } G}*B`m  
   } Uk4">]oct  
  } st>t~a|T  
  else if((lParam&0xc000ffff)==1){ //Key down 9IV WbJ  
   switch(wParam) }% *g\%L  
   { NST6pu\,U  
    case VK_MENU: /0(KKZ)  
     MaskBits|=ALTBIT; /|f]L9)2<  
     break; v2Y=vr  
    case VK_CONTROL: &$f?XdZ7  
     MaskBits|=CTRLBIT; Wi<Fkzj  
     break; g11K?3*%Q  
    case VK_SHIFT: n66 _#X  
     MaskBits|=SHIFTBIT; DQ$/0bq   
     break; 1<UQJw45  
    default: //judge the key and send message D?R  z|  
     break; e ^QOn  
   } I(SE)%!%S  
   for(int index=0;index<MAX_KEY;index++) I5,Fh>  
   { sBMHf9u  
    if(hCallWnd[index]==NULL) cA kw5}P   
     continue; Z)~ 2{)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $}@l l^  
    { ececN{U/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ns-x\B?^  
     bProcessed=TRUE; $6N. ykJ  
    } #XZ?,neY  
   } w# ['{GL  
  } 2#!D"F  
  if(!bProcessed){ >8Y >B)  
   for(int index=0;index<MAX_KEY;index++){ X9J^Olq  
    if(hCallWnd[index]==NULL) (iFhn*/ E  
     continue; fi1UUJ0 U;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) _kS us  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); bZ)Jgz  
   } Kfh"XpWc$  
  } BshS@"8r  
 } e=U7w7(s9  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /dAIg1ra  
} @4pN4v8U  
SFHa(JOS  
BOOL InitHotkey() s$Mj4_p3l  
{ ZHT.+X:_  
 if(hHook!=NULL){ uAP|ASH9T  
  nHookCount++; `WVQp"m  
  return TRUE; UU_k"D~  
 } XX =A1#H  
 else UX6-{ RP  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); }.#C9<"}  
  if(hHook!=NULL) WE3l*7<@  
   nHookCount++; vCJjZ%eO%D  
  return (hHook!=NULL); ^U52 *6  
} 8p5u1 ;2  
BOOL UnInit() p&7>G-.  
{ g$ h!:wW  
 if(nHookCount>1){ Ut<_D8Tzx  
  nHookCount--; ^vzNs>eJ  
  return TRUE; yuND0,e  
 } ?D#Vha  
 BOOL unhooked = UnhookWindowsHookEx(hHook); [mhY_Hmz]  
 if(unhooked==TRUE){ n[<Vj1n  
  nHookCount=0; 7w9) ^  
  hHook=NULL; U7OW)tUf  
 } M/BBNT  
 return unhooked; F](kU#3"S  
} :Z<-J`  
{pVD`#Tl[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) J &c}z4  
{ +!X^E9ra  
 BOOL bAdded=FALSE; 9%4rO\q  
 for(int index=0;index<MAX_KEY;index++){ "B.l j)  
  if(hCallWnd[index]==0){ SgJQH7N  
   hCallWnd[index]=hWnd; N-suBRnW  
   HotKey[index]=cKey; do G&qXw  
   HotKeyMask[index]=cMask; c1c0b|B!U  
   bAdded=TRUE; ='~C$%  
   KeyCount++; Qq5)|m  
   break; En1pz\'  
  } xD1w#FMlQs  
 } x;ujR<  
 return bAdded; sC/T)q2  
} 1<lLE1fk  
<jV_J+#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k)4   
{ ) ><{A  
 BOOL bRemoved=FALSE; Ix"uk6 h  
 for(int index=0;index<MAX_KEY;index++){ ?!Y2fK=h0  
  if(hCallWnd[index]==hWnd){ >zXw4=J  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^G15]Pyw  
    hCallWnd[index]=NULL; ^/c&Ud  
    HotKey[index]=0; ns@b0'IF]  
    HotKeyMask[index]=0; f ^z7K  
    bRemoved=TRUE; Uc \\..Cf  
    KeyCount--; X|X6^}  
    break; NFsMc0{  
   } U1B5gjN  
  } w<5w?nP+Oh  
 } IS"UBJ6p  
 return bRemoved; C%l~qf1n  
} iz>a0~(K  
!<@Zf4m  
void VerifyWindow() #AE'arT<  
{ A-uEZj_RD=  
 for(int i=0;i<MAX_KEY;i++){ v@[MX- ,8  
  if(hCallWnd!=NULL){ DqbN=[!X~n  
   if(!IsWindow(hCallWnd)){ ]e 81O#t3  
    hCallWnd=NULL; gZ:)l@ Wu  
    HotKey=0; vuA';,:~  
    HotKeyMask=0; Bx;bc  
    KeyCount--; )N<>L/R  
   } &!a[rvtZ+  
  } U_Id6J]8  
 } ewD61Y8-  
} (:-=XR9A`  
vV,H@WK  
BOOL CHookApp::InitInstance()  ]Ocf %(  
{ Lr_+) l  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); qVx0VR1:  
 hins=AfxGetInstanceHandle(); _"Y;E  
 InitHotkey(); Ay/ "2pDZ  
 return CWinApp::InitInstance(); Y<I/y  
}  Jcy  
{C[<7r uF  
int CHookApp::ExitInstance() UeX3cD  
{ #P<v[O/rA  
 VerifyWindow(); 6(VCQ{  
 UnInit(); C 3b  
 return CWinApp::ExitInstance(); +(QGlRd  
} qJKD| =_  
lmgMR|v  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file V.>'\b/#  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) v_En9~e^n  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ s'J8E+&5  
#if _MSC_VER > 1000 Q9]7.^l  
#pragma once (Rve<n6{A  
#endif // _MSC_VER > 1000 A!x_R {,yH  
H'P1EZtq  
class CCaptureDlg : public CDialog D/"[/!  
{ D9 OS,U/l  
 // Construction ebcGdC/%>  
 public: z+C>P4c-y&  
  BOOL bTray; ?TLMoqmXM{  
  BOOL bRegistered; Yy@;U]R  
  BOOL RegisterHotkey(); b(&2/|hd  
  UCHAR cKey; u yzc"d i  
  UCHAR cMask; ;lB%N t<,  
  void DeleteIcon(); !LVWggk1  
  void AddIcon(); [>=D9I@~  
  UINT nCount; 1>[3(o3t  
  void SaveBmp(); "@;q! B.qo  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor E;fYL]j/oZ  
  // Dialog Data 7  g8SK  
  //{{AFX_DATA(CCaptureDlg) yNoJrA  
  enum { IDD = IDD_CAPTURE_DIALOG }; #KF:(2  
  CComboBox m_Key; T2AyQ~5~  
  BOOL m_bControl; zQMsS  
  BOOL m_bAlt; ,2qJXMg"=$  
  BOOL m_bShift; 8$io^n\i  
  CString m_Path; q&B'peT  
  CString m_Number; MMqkNe  
  //}}AFX_DATA Q.*qU,4);  
  // ClassWizard generated virtual function overrides >k,bHGj?  
  //{{AFX_VIRTUAL(CCaptureDlg) F42r]k  
 public: x }[/A;N  
  virtual BOOL PreTranslateMessage(MSG* pMsg); W/<]mm~95  
 protected:  ?}e8g  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mL?9AxO  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 8P.t  
  //}}AFX_VIRTUAL Am'5|  
  // Implementation #UG|\}Lp  
 protected: D}XyT/8G3  
  HICON m_hIcon; 0?qXDO&~  
  // Generated message map functions ]tA39JK-i  
  //{{AFX_MSG(CCaptureDlg) G"T)+! 6t  
  virtual BOOL OnInitDialog(); |\TOSaZ  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); UTGR{>=>  
  afx_msg void OnPaint(); p+ SFeUp  
  afx_msg HCURSOR OnQueryDragIcon(); &PI}o  
  virtual void OnCancel(); d8`^;T ;}d  
  afx_msg void OnAbout(); &W:Wv,3  
  afx_msg void OnBrowse(); a,b ;H(em  
  afx_msg void OnChange(); iJv4%|9  
 //}}AFX_MSG RIJ+]uir4  
 DECLARE_MESSAGE_MAP() Q:& ,8h[  
}; m(,vym t  
#endif O`~G'l&@T  
R/R[r> 1)6  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file O+%Y1=S[WQ  
#include "stdafx.h" =K I4  
#include "Capture.h" W"?|OQ'  
#include "CaptureDlg.h" pN6!IxN$  
#include <windowsx.h> %Rj:r!XB:  
#pragma comment(lib,"hook.lib") .\= GfF'  
#ifdef _DEBUG g6o-/A!Q3  
#define new DEBUG_NEW ;W]NT 4p  
#undef THIS_FILE JM!rop^  
static char THIS_FILE[] = __FILE__; B;XFPQ#b  
#endif  *>j u1f  
#define IDM_SHELL WM_USER+1 >gM|:FG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); jv>l6)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $'btfo4H  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; "2;$?*hO#  
class CAboutDlg : public CDialog  Z+`mla  
{ .",E}3zn  
 public: b2u_1P\  
  CAboutDlg(); m:5*:Ii.  
  // Dialog Data hAi50q;z  
  //{{AFX_DATA(CAboutDlg) fp|!LU  
  enum { IDD = IDD_ABOUTBOX }; vNlYk  
  //}}AFX_DATA `An|a~G1  
  // ClassWizard generated virtual function overrides $J"}7+  
  //{{AFX_VIRTUAL(CAboutDlg) mV^+`GWvo  
 protected: |B<+Y<)f^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support a9 7A{7I&  
  //}}AFX_VIRTUAL "]>JtK  
  // Implementation |VbF&*v`  
 protected: NlXHOUw)u  
  //{{AFX_MSG(CAboutDlg) :$."x '  
  //}}AFX_MSG zRN_` U  
  DECLARE_MESSAGE_MAP() Rd|};-  
}; h~{TCK+I  
Qc#<RbLL  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ,2q LiE>  
{ %$ |=_K)Ks  
 //{{AFX_DATA_INIT(CAboutDlg) `=0}+  
 //}}AFX_DATA_INIT unKTa*U^q  
} M%pxv6?""{  
g0GC g  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Z12-Vps  
{ Ic/D!J{Y  
 CDialog::DoDataExchange(pDX); fvK):eCo  
 //{{AFX_DATA_MAP(CAboutDlg) :pj#t$:!  
 //}}AFX_DATA_MAP uq~$HXdc  
} NBZFIFO<  
{;1Mud  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) GhpVi<FL  
 //{{AFX_MSG_MAP(CAboutDlg) 0*S]m5#;  
 // No message handlers ukb2[mb*u  
 //}}AFX_MSG_MAP QxG:NN;jW  
END_MESSAGE_MAP() !]=  
Q$Qs$  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) $ ,Y\  
: CDialog(CCaptureDlg::IDD, pParent)  vp7J';  
{ Lb;:<  
 //{{AFX_DATA_INIT(CCaptureDlg) aF1i!Z  
  m_bControl = FALSE; swV/M i>  
  m_bAlt = FALSE; ua[ d  
  m_bShift = FALSE; k2DT+}u7G  
  m_Path = _T("c:\\"); k"X<gA  
  m_Number = _T("0 picture captured."); g>)&Q >}=W  
  nCount=0; Y1?w f.  
  bRegistered=FALSE; '*H&s  
  bTray=FALSE; vpu20?E>5z  
 //}}AFX_DATA_INIT de{@u<Y Zb  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 :E'uV" j%  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); k/bY>FY2r  
} W@U<GF1  
TY}9;QL:  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) e<o{3*%p)  
{ tmEF7e`(o  
 CDialog::DoDataExchange(pDX); L5$r<t<  
 //{{AFX_DATA_MAP(CCaptureDlg) 7 -yf  
  DDX_Control(pDX, IDC_KEY, m_Key); 3>;zk#b2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); yop,%Fe  
  DDX_Check(pDX, IDC_ALT, m_bAlt); =yo?]ZS  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); W&>ONo6ki  
  DDX_Text(pDX, IDC_PATH, m_Path); kU^*hd ]  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Y&M}3H>E  
 //}}AFX_DATA_MAP @vzv9c[  
} +Y;/10p  
2;X{ZLo  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 06pEA.ro  
//{{AFX_MSG_MAP(CCaptureDlg) S9BwCKH  
 ON_WM_SYSCOMMAND() t* eZe`|  
 ON_WM_PAINT() RMJq9a  
 ON_WM_QUERYDRAGICON()  <sdC#j  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 9w\ yWxl  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) i2$7nSQ9  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ,pfHNK-u  
//}}AFX_MSG_MAP L[v-5u)  
END_MESSAGE_MAP() h\C" ti2  
e$!01Y$HI  
BOOL CCaptureDlg::OnInitDialog() K(bid0 Y  
{ S ?v^/F  
 CDialog::OnInitDialog(); hH Kd+QpI  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); U Px7u%Do  
 ASSERT(IDM_ABOUTBOX < 0xF000); iIrH&}2  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ^|Bpo(  
 if (pSysMenu != NULL) up`.#GWm  
 { 7-Bttv{  
  CString strAboutMenu; dC&{zNG  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Tgxxm  
  if (!strAboutMenu.IsEmpty()) "h.-qQGU%  
  { Py?EA*(d#  
   pSysMenu->AppendMenu(MF_SEPARATOR); QN!.~>  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); \~j6}4XS1.  
  } $:&?!>H  
 } N0U6N< w  
 SetIcon(m_hIcon, TRUE); // Set big icon dt -EY  
 SetIcon(m_hIcon, FALSE); // Set small icon &dA{<.  
 m_Key.SetCurSel(0); *hugQh ]a  
 RegisterHotkey(); 8&d s  
 CMenu* pMenu=GetSystemMenu(FALSE); &+"-'7  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Y"eR&d  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); a3i;r M2  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); TF0DQP  
 return TRUE; // return TRUE unless you set the focus to a control fMg3  
} fK-tvP0}*  
N%3 G\|~Q  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) E]Wnl\Be  
{ z 'iAj  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 'j6)5WL$  
 { BNA`Cc1VV  
  CAboutDlg dlgAbout; M{sn{  
  dlgAbout.DoModal(); ZH o#2{F  
 } Ky6.6Y<.|  
 else Mv\odf\]  
 { ;0R|#9oX_  
  CDialog::OnSysCommand(nID, lParam); FPg5!O%  
 } 6x6xv:\  
} [X9s\H  
a?^xEye  
void CCaptureDlg::OnPaint() [xaglZ9HNo  
{ IdY\_@$ v  
 if (IsIconic()) .tFMa:   
 { >9?BJv2  
  CPaintDC dc(this); // device context for painting g 0=Q>TzY  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); d5b \kRr  
  // Center icon in client rectangle 2!UNFv#=$  
  int cxIcon = GetSystemMetrics(SM_CXICON); f76bEe/B9  
  int cyIcon = GetSystemMetrics(SM_CYICON); N.j?:  
  CRect rect; $ U~3$*R  
  GetClientRect(&rect); #zRT  
  int x = (rect.Width() - cxIcon + 1) / 2; -Odk'{nW  
  int y = (rect.Height() - cyIcon + 1) / 2; n aQ0TN,  
  // Draw the icon E~k_4z% M  
  dc.DrawIcon(x, y, m_hIcon); .bwKG`F  
 } xKo l  
 else >n`!S`)9{  
 { a.oZ}R7'Y  
  CDialog::OnPaint(); QvPG 6A]T  
 } pONBF3H8  
} dcK7Dd->  
9)_fH6r  
HCURSOR CCaptureDlg::OnQueryDragIcon() )2 Omsh  
{ jjs1Vj1@<  
 return (HCURSOR) m_hIcon; h3B s  
} l7g< $3  
yUZ;keQ_Tw  
void CCaptureDlg::OnCancel() c(]NpH in  
{ ,g2oqq ?  
 if(bTray) 2E@ !  
  DeleteIcon(); y 093-  
  CDialog::OnCancel(); 9`3%o9V9Y  
} #D{jNSB  
?<Tt1fpG  
void CCaptureDlg::OnAbout() d#?.G3YmK  
{ (|(#W+l~  
 CAboutDlg dlg; 2g)W-M  
 dlg.DoModal(); p@/i e@DX  
} }s0?RH  
k8]uy2R6}  
void CCaptureDlg::OnBrowse() 3Pb]Of#  
{ K#O8P+n5[  
 CString str; L_3undy,  
 BROWSEINFO bi; ~|LlT^C  
 char name[MAX_PATH]; $m.e}`7SF!  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); N*k`'T  
 bi.hwndOwner=GetSafeHwnd(); ]yTMWIx#  
 bi.pszDisplayName=name; }~Am{Er <l  
 bi.lpszTitle="Select folder"; Sdc yL%6!  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; t-xw=&!w  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Bf&,ACOf  
 if(idl==NULL) :/Zy=F9:  
  return; AfzE0mBW  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); R'#[}s  
 str.ReleaseBuffer(); Ha U6`IP  
 m_Path=str; )czuJ5  
 if(str.GetAt(str.GetLength()-1)!='\\') I?) .D?o  
  m_Path+="\\"; !y8/El  
 UpdateData(FALSE); a0vg%Z@!  
} rtl|zCst  
mN_KAln  
void CCaptureDlg::SaveBmp() ^%^~:<N  
{ RhJ{#G~:%  
 CDC dc; XO*|P\#^  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); E^I|%F  
 CBitmap bm; A4}6hG#  
 int Width=GetSystemMetrics(SM_CXSCREEN); BE54^U  
 int Height=GetSystemMetrics(SM_CYSCREEN); MroJ!.9  
 bm.CreateCompatibleBitmap(&dc,Width,Height); YTiXU Oj  
 CDC tdc; y4aW8J#  
 tdc.CreateCompatibleDC(&dc); DEGEr-  
 CBitmap*pOld=tdc.SelectObject(&bm); ;C1]gJZ,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); X8TwMt  
 tdc.SelectObject(pOld); ZH9sf~7  
 BITMAP btm; ;QT.|.t6  
 bm.GetBitmap(&btm); J|DID+M  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; hpftVEB  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); I}5#!s< {&  
 BITMAPINFOHEADER bih; a$ f$CjQ  
 bih.biBitCount=btm.bmBitsPixel; <&n\)R4C1  
 bih.biClrImportant=0; P4{8pO]B  
 bih.biClrUsed=0; :G&tM   
 bih.biCompression=0; -Y#YwBy;M  
 bih.biHeight=btm.bmHeight; D^(Nijl9U  
 bih.biPlanes=1; /8Sg<  
 bih.biSize=sizeof(BITMAPINFOHEADER); DKd:tL24&  
 bih.biSizeImage=size; 7*bUy)UZ  
 bih.biWidth=btm.bmWidth; Ae&470  
 bih.biXPelsPerMeter=0; _f9XY  
 bih.biYPelsPerMeter=0; C;#-2^h  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); #G[S  
 static int filecount=0; `lAe2l^  
 CString name; 7Eo a~  
 name.Format("pict%04d.bmp",filecount++); N5>ioJj  
 name=m_Path+name; 5PY,}1`  
 BITMAPFILEHEADER bfh; Fa}3UVm  
 bfh.bfReserved1=bfh.bfReserved2=0; #KC& ct  
 bfh.bfType=((WORD)('M'<< 8)|'B'); d5/x2!mH8  
 bfh.bfSize=54+size; <:[ P&Y  
 bfh.bfOffBits=54; -YF]k}|  
 CFile bf; 2!Bjs?K<bv  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ rJ2yi6TB\  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); W@R\m=e2  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); AE1EZ#  
  bf.WriteHuge(lpData,size); "~ 1:7{k  
  bf.Close(); ,+0#.N s$  
  nCount++; (;RmfE'PX  
 } xign!=  
 GlobalFreePtr(lpData); C&Nga `J  
 if(nCount==1) vM_UF{a$=  
  m_Number.Format("%d picture captured.",nCount); dso6ZRx  
 else xcBV,[E{  
  m_Number.Format("%d pictures captured.",nCount); >HvgU_  
  UpdateData(FALSE); El3Y1g3+3  
} Ne{2fV>8Ay  
nE_g^  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) TQXp9juK  
{ S8 +GM  
 if(pMsg -> message == WM_KEYDOWN) F:p'%#3rU/  
 { >LvQ&fAo  
  if(pMsg -> wParam == VK_ESCAPE) DG2CpR)S  
   return TRUE; T8nOb9Nrj  
  if(pMsg -> wParam == VK_RETURN) iUNlNl ?  
   return TRUE; 3em&7QM  
 } " 3ryp A  
 return CDialog::PreTranslateMessage(pMsg); O$<m(~[S  
} azEN_oUV  
TR@*tfS  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Dt)O60X3>  
{ (jR7D"I  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Wq5Nc  
  SaveBmp(); ]/G~ L  
  return FALSE; T7F)'Mx<  
} *@2+$fgz  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ WA~PE` U  
 CMenu pop; 7/$r  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); =f FTi1]/h  
 CMenu*pMenu=pop.GetSubMenu(0); dA[MjOd3  
 pMenu->SetDefaultItem(ID_EXITICON); %E1_)^ ^  
 CPoint pt; @m#1[n;  
 GetCursorPos(&pt); BWtGeaW/sr  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); w;e42.\  
 if(id==ID_EXITICON) ,CGq_>Z  
  DeleteIcon(); l"T{!Oq  
 else if(id==ID_EXIT) G54,`uz2  
  OnCancel(); 4&)4hF  
 return FALSE; A>0wqT  
} &CtWWKS"  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); nnw5 !q_  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) dV~d60jOF  
 AddIcon(); /'yi!:FZFC  
 return res; \Z?.Po`!j  
} =N,ahq  
MLd*WpiI.  
void CCaptureDlg::AddIcon() APne!  
{ GjHV|)^  
 NOTIFYICONDATA data; [{K   
 data.cbSize=sizeof(NOTIFYICONDATA); !)!<. x  
 CString tip; XIS.0]~  
 tip.LoadString(IDS_ICONTIP); { \r1A  
 data.hIcon=GetIcon(0); KG2ij~v  
 data.hWnd=GetSafeHwnd(); 7W7!X\0Y  
 strcpy(data.szTip,tip); Zze(Ik  
 data.uCallbackMessage=IDM_SHELL; ,JL Y oE+  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; @i" ^b  
 data.uID=98; TB oN8cB}  
 Shell_NotifyIcon(NIM_ADD,&data); 49e~/YY  
 ShowWindow(SW_HIDE); $y2"Q,n+  
 bTray=TRUE; S yf0dp3  
} 7KB:wsz^  
|=\w b^l+  
void CCaptureDlg::DeleteIcon() K6 {0`'x  
{ z~Ec*  
 NOTIFYICONDATA data; u'm[wjCj c  
 data.cbSize=sizeof(NOTIFYICONDATA); .q!U@}k.  
 data.hWnd=GetSafeHwnd(); P%CNu  
 data.uID=98; Q5!"tF p  
 Shell_NotifyIcon(NIM_DELETE,&data); `1 tD&te0  
 ShowWindow(SW_SHOW); .lcI"%>  
 SetForegroundWindow(); ~9tPT 0^+  
 ShowWindow(SW_SHOWNORMAL); ljS~>&  
 bTray=FALSE; Y[\ZN  
} t V]BcDp  
QcXqMx  
void CCaptureDlg::OnChange() ME9jN{ le  
{ qjtrU#n  
 RegisterHotkey(); 8/tvS8I#y  
} F74^HQ*J  
qYwEPGa\  
BOOL CCaptureDlg::RegisterHotkey() ?6m6 4{M  
{ Z*M]AvO+#  
 UpdateData(); 1=9M@r~ ^  
 UCHAR mask=0; nc0!ag  
 UCHAR key=0; e2P ds`  
 if(m_bControl) _xHEA2e!  
  mask|=4; m\Xgvpv rP  
 if(m_bAlt) 3T<aGW1  
  mask|=2; &4m\``//9  
 if(m_bShift) NI1jJfH|l  
  mask|=1; %GY U$aA  
  key=Key_Table[m_Key.GetCurSel()]; YhZmyYamE  
 if(bRegistered){ nWyn}+C-  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); `Tt;)D  
  bRegistered=FALSE; ~S$\ PG4  
 } SDW_Y^Tb  
 cMask=mask; {hE\ECT-  
 cKey=key; /c>@^  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 3=)!9;uY  
 return bRegistered; pKxq\U  
} pow.@  
l1EI4Y9KG  
  四、小结 ;mi+[`E  
yLDv/r  
  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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