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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: % tJ?dlD'  
  94a _ W9  
  一、实现方法 ,U7hzBj8k  
yGD0}\!n  
  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: '.dW>7  
O! j@8~='  
#pragma data_seg("shareddata") #JW1JCT  
HHOOK hHook =NULL; //钩子句柄 P{qn@:  
UINT nHookCount =0; //挂接的程序数目 bX6*/N  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 qkBnEPWZy  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 DX!$k[  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey pD>3c9J'^F  
static int KeyCount =0; >eEf|tKO  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 FCP5EN  
#pragma data_seg() A{c6XQR~z  
|j!D _j#U  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 4 B> l|%  
/z'j:~`E  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: R1 wd Q8q  
4({=(O  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ,>g 6OU2~6  
cKey,UCHAR cMask) .6'T;SoK>  
{ J`V6zGgW  
 BOOL bAdded=FALSE; 1U9iNki  
 for(int index=0;index<MAX_KEY;index++){ UbYKiLDF)  
  if(hCallWnd[index]==0){ Mr1pRIYMd  
   hCallWnd[index]=hWnd; :5Vu.\,1  
   HotKey[index]=cKey; s e1ipn_A  
   HotKeyMask[index]=cMask; _E "[%  
   bAdded=TRUE;  ?Z!KV=  
   KeyCount++; sV+>(c-$  
   break; *o>E{  
  } B#gmT2L  
 } Zn^E   
 return bAdded; \GWq0z&  
} + X ?jf.4  
//删除热键 `C()H@;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) gTq-\k(  
{ +amvQ];?Q8  
 BOOL bRemoved=FALSE; awawq9)Y  
 for(int index=0;index<MAX_KEY;index++){ *PI3L/*  
  if(hCallWnd[index]==hWnd){ ^Uf`w7"iY  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ O7K))w  
    hCallWnd[index]=NULL; vd ;wQ  
    HotKey[index]=0; IR>K ka(B  
    HotKeyMask[index]=0; lu{}j4  
    bRemoved=TRUE; :#LB}=HQ  
    KeyCount--; dHu]wog  
    break; !uZ+r%  
   } ]MHQ "E?  
  } &B.r&K&  
 } MVj@0W33m  
 return bRemoved; k]JLk"K  
} s R~&S))  
UkYQ<MNO  
i3~!ofTb  
  DLL中的钩子函数如下: iIT<{m&`  
"2h#i nS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) lfKknp#B/O  
{ ZHBwoC#5}  
 BOOL bProcessed=FALSE; 54OYAkPCk  
 if(HC_ACTION==nCode) V|D;7  
 { nJ?C4\#3  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 PU>;4l  
   switch(wParam) & p%,+|  
   {  z=xHk|+'  
    case VK_MENU: h}oQr0"c  
     MaskBits&=~ALTBIT; #[si.rv->  
     break; G'epsD,.bX  
    case VK_CONTROL: b'&pJ1]]}  
     MaskBits&=~CTRLBIT; j NY8)w_  
     break; ]@f6O *&=  
    case VK_SHIFT: i" )_M|   
     MaskBits&=~SHIFTBIT; l?~ci ;lG  
     break; lz*PNT{E  
    default: //judge the key and send message w iq{ Jo#  
     break; }iC~B}  
   } :@/fy}!  
   for(int index=0;index<MAX_KEY;index++){ pqs)ueu  
    if(hCallWnd[index]==NULL) W@G[ gS\T  
     continue; i~,k2*o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4EpzCaEZ  
    { ! $iR:ji  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4/jY;YN,2  
     bProcessed=TRUE; 5A)w.i&V  
    } ceOjuzY  
   } <,GHy/u\  
  } SUEw5qitB  
  else if((lParam&0xc000ffff)==1){ //有键按下 B -KOf  
   switch(wParam) 7^; OjO@8  
   { WNx^Rg" >'  
    case VK_MENU: 2eK\$_b_  
     MaskBits|=ALTBIT; y((_V%F}  
     break; 6?lg 6a/eO  
    case VK_CONTROL: 1^;h:,e6  
     MaskBits|=CTRLBIT; J'EK5=H  
     break; M;9+L&p=  
    case VK_SHIFT: =6dKC_Q  
     MaskBits|=SHIFTBIT; xsvs3y|  
     break; 7L]?)2=  
    default: //judge the key and send message Gh pd k;  
     break; A)#sh) }Q  
   } 2mO#vTX4  
   for(int index=0;index<MAX_KEY;index++){ c>R(Fs|6  
    if(hCallWnd[index]==NULL) (w- u"1&  
     continue; @r43F$bcqo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~Qsj)9  
    { $O>@(K  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Jv<)/Km`  
     bProcessed=TRUE; Id*^H:]C#  
    } >(CoXSV5  
   } vz:0"y  
  } g?VME]:  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 qIT{`hX  
   for(int index=0;index<MAX_KEY;index++){ kziBHis!  
    if(hCallWnd[index]==NULL) a(~Yr A%~  
     continue; J*Hn/m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5:d2q<x:{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5{a( +'  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 vw]nqS~N  
   } ##@#:B  
  } 9vTQ^*b m  
 } 8_m9CQ6 i  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); tb{{oxa,k  
} QT$1D[>  
c #!6  
  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: $ ddYH  
I3Lsj}69  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "k|`xn  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O)|4>J*B  
Ltw7b  
  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: <`3(i\-X  
EAB+kY  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) K)+l6Q  
{ ?GarD3#A  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) #<PdZl R  
 { 5Nb_K`Vp*  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ehusI-q  
  SaveBmp(); 5)7mjyo%  
  return FALSE; /vDF<HVzm  
 } S7/v ,E  
 …… //其它处理及默认处理 \,!q[nC  
} Q/n.T0Z ^  
I 6YT|R  
Bqi2n'^O2  
  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。 HdUW(FZ  
RM1uYFs<  
  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。 &] 6T^.  
_0["J:s9  
  二、编程步骤 /A.i5=k  
/&:9VMMj  
  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"; .K1E1Z_  
BDRVT Y(s  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Vk_&W.~  
t)Q @sKT6  
  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; ('-}"3  
?1:/ 6  
  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; SQU%N  
]~Vu-@ /}  
  5、 添加代码,编译运行程序。 #ljg2:I+  
9:i,WJO  
三、程序代码 (y=o]Vy  
(I ds<n"  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL K=?F3tX^  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ]C6[`WF  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ idS RWa  
#if _MSC_VER > 1000 QeJ.o.m{  
#pragma once _ 1> 4Q%  
#endif // _MSC_VER > 1000 }!]x|zU.=  
#ifndef __AFXWIN_H__ Yb3f]4EH  
#error include 'stdafx.h' before including this file for PCH p}DF$k%`  
#endif xO-U]%oq  
#include "resource.h" // main symbols +7< >x-+  
class CHookApp : public CWinApp ]MLLr'6?  
{ y6Epi|8  
 public: {dx /p-Tv  
  CHookApp(); (E}cA&{  
  // Overrides *.]E+MYi*  
  // ClassWizard generated virtual function overrides :2)1vQH0L  
  //{{AFX_VIRTUAL(CHookApp) 6a?$=y  
 public: `ab\i`g9  
  virtual BOOL InitInstance(); Y0yO `W4  
  virtual int ExitInstance(); \seG2vw$  
  //}}AFX_VIRTUAL Rfc&OV  
  //{{AFX_MSG(CHookApp) %Fg8l{H3  
  // NOTE - the ClassWizard will add and remove member functions here. ,e FQ}&^A  
  // DO NOT EDIT what you see in these blocks of generated code ! P"uHtHK  
  //}}AFX_MSG 8H#c4%by)  
  DECLARE_MESSAGE_MAP() Owpg]p yVD  
}; ,PMb9 O\B  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); B/D\gjb  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,V]A63J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RvSq KW8  
BOOL InitHotkey(); sMS9!{A  
BOOL UnInit(); &<V_[Wh"  
#endif ;#yu"6{  
QS [B  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. "gvw0)  
#include "stdafx.h" h@,e`Z  
#include "hook.h" -V u/TT0  
#include <windowsx.h> (d'j'U:C  
#ifdef _DEBUG a5}44/%  
#define new DEBUG_NEW 9^QYuf3O  
#undef THIS_FILE wz*A<iU  
static char THIS_FILE[] = __FILE__; dXcPWbrU4  
#endif u:uSsAn0$  
#define MAX_KEY 100 q= yZx)  
#define CTRLBIT 0x04 3']:1B  
#define ALTBIT 0x02 +8)]m<  
#define SHIFTBIT 0x01 8f,'p}@!d  
#pragma data_seg("shareddata") mo#0q&ZQ  
HHOOK hHook =NULL; ,B~lwF9  
UINT nHookCount =0; rbK#a)7  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey |aS~"lImh  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Cj !i)-  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey <duBwkiG  
static int KeyCount =0; /iTUex7T  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift >1r[]&8  
#pragma data_seg() YNg\"XjJM<  
HINSTANCE hins; _(6B.  
void VerifyWindow(); K Z!N{.Jk  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) g| ._n  
//{{AFX_MSG_MAP(CHookApp) - Y8ks7  
// NOTE - the ClassWizard will add and remove mapping macros here. rO(TG  
// DO NOT EDIT what you see in these blocks of generated code! T018)WrhL  
//}}AFX_MSG_MAP c BHL,  
END_MESSAGE_MAP() \)otu\3/  
uRm_  
CHookApp::CHookApp() >'ksXA4b  
{ Wj4^W<IO  
 // TODO: add construction code here, !2Xr~u7a  
 // Place all significant initialization in InitInstance rv,NQZ  
} A3MZxu=':3  
NF/Ti5y  
CHookApp theApp; rwL=R,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %jZp9}h  
{ I mPu}  
 BOOL bProcessed=FALSE; qIDWl{b<  
 if(HC_ACTION==nCode) hY.e[+  
 { jSie&V@px  
  if((lParam&0xc0000000)==0xc0000000){// Key up ^Y{6;FJ  
   switch(wParam) aYaG]&hb  
   { #a(%(k S  
    case VK_MENU: M<A;IOpR+  
     MaskBits&=~ALTBIT; `J>E9p<  
     break; '&-5CpDUs  
    case VK_CONTROL: #QTfT&m+G}  
     MaskBits&=~CTRLBIT; AaVI%$  
     break; obAs<nk  
    case VK_SHIFT: d; mmM\3]  
     MaskBits&=~SHIFTBIT; 8! H8[J  
     break; ASKAgU"h  
    default: //judge the key and send message X,WQ'|rC  
     break; <JL\?)}n  
   } s- ,=e  
   for(int index=0;index<MAX_KEY;index++){ `Di ^6UK(  
    if(hCallWnd[index]==NULL) fiE>H~  
     continue; G2CZwm{/f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ka5#<J7<p  
    { }uF[Ra  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?W[J[cb  
     bProcessed=TRUE; j-lSFTo  
    } &'5@azU  
   } t} *l?$`  
  } q_<*esZ,  
  else if((lParam&0xc000ffff)==1){ //Key down +36H%&!  
   switch(wParam) MkG`w,  
   { v8=?HUDd  
    case VK_MENU: {{V ;:+62  
     MaskBits|=ALTBIT; });cX$  
     break; ^))PCn_zb  
    case VK_CONTROL: u}K5/hC  
     MaskBits|=CTRLBIT; pqyWv;  
     break; aBXYri  
    case VK_SHIFT: ;cv.f>Cm  
     MaskBits|=SHIFTBIT; zwM"`z  
     break; :y+B;qw  
    default: //judge the key and send message 6=ZRn gQ  
     break; Q`.'-iq  
   } jo9J%vo  
   for(int index=0;index<MAX_KEY;index++) `zdH1p^w  
   { 2d-TU_JqX  
    if(hCallWnd[index]==NULL) T@;! yz}Pf  
     continue; Gw ~{V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Qg'c?[~W@  
    { |d,F-9iw  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ==%`e/~Y  
     bProcessed=TRUE; .S~@BI(|<  
    } L;/9L[s,  
   } LP.HS'M~u  
  } Sm$p\ORa  
  if(!bProcessed){ h5L=M^z!>  
   for(int index=0;index<MAX_KEY;index++){ !]$V9F{K  
    if(hCallWnd[index]==NULL) UWQtvQ f  
     continue; ;[(= kOI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) i&'#+f4t  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); zP_]  
   } E]?)FH<oP  
  } ppAmN0=G  
 } oR*ztM  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); iuiAK  
} =nJ{$%L\x,  
<+V-k|  
BOOL InitHotkey() ?qju DD  
{ d{er |$E?  
 if(hHook!=NULL){ B4`2.yRis  
  nHookCount++; qBT_! )h   
  return TRUE; &MCy.(jN  
 } }5Yj  
 else # v{Y=$L  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); T"n{WmVQ  
  if(hHook!=NULL) -glugVq  
   nHookCount++; Rw{$L~\  
  return (hHook!=NULL); IikG /8lP  
} V?OuIg%=:  
BOOL UnInit() :1:3Svb<Y  
{ 8]S,u:E:N  
 if(nHookCount>1){ 3^{8_^I  
  nHookCount--; }1 $hxfb  
  return TRUE; 0CT}DQ._^N  
 } AT"!{Y "H  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Vwjk[ DOL  
 if(unhooked==TRUE){ ov8 ByJc  
  nHookCount=0; ? Phk~ jE  
  hHook=NULL; kW#S]fsfU  
 } q[-|ZA bbr  
 return unhooked; ]JH64~a  
} yH*hL0mO  
m;dm|4L^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Sa L"!uAk  
{ $0_^=D EW  
 BOOL bAdded=FALSE; }i(qt&U;  
 for(int index=0;index<MAX_KEY;index++){ *RBV'b  
  if(hCallWnd[index]==0){ (B@X[~  
   hCallWnd[index]=hWnd; )T9;6R$b  
   HotKey[index]=cKey; bG "H D?A_  
   HotKeyMask[index]=cMask; " jT#bIm  
   bAdded=TRUE; 1@xP(XS  
   KeyCount++; Bp :~bHf  
   break; =-_)$GOI'  
  } <0#^7Z  
 } ;(7-WnU8N  
 return bAdded; C\7u<2c  
} o7.e'1@  
$*k)|4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^ oYPyk`9  
{ N#4N?BBP"  
 BOOL bRemoved=FALSE; wzd`l?o,  
 for(int index=0;index<MAX_KEY;index++){ ndw7v  
  if(hCallWnd[index]==hWnd){ ;+sl7qlA4  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ xOythvO  
    hCallWnd[index]=NULL; +IrZ ;&oy  
    HotKey[index]=0; 6O pa{]  
    HotKeyMask[index]=0; r088aUO P  
    bRemoved=TRUE; ^5>s7SGB"  
    KeyCount--; $_sYfU9  
    break; jo}1u_OJ  
   } %<ic%gt`#  
  } v9=}S\=Cd  
 } s.VA!@F5  
 return bRemoved; K1OkZ6kl  
} F|Q H  
3V?817&6z  
void VerifyWindow() ) V36t{  
{ # Q}_e7t  
 for(int i=0;i<MAX_KEY;i++){ )n( Q  
  if(hCallWnd!=NULL){ UP2}q?4  
   if(!IsWindow(hCallWnd)){ F?9SiX[\  
    hCallWnd=NULL; Di>rO038  
    HotKey=0; Ry?4h\UX5  
    HotKeyMask=0; e # 5BPI  
    KeyCount--; LEZ&W ;bCo  
   } >.e+S?o  
  } \7Qb229?  
 } 'f+NW &   
} )s)_XL  
=LI:S|[4  
BOOL CHookApp::InitInstance() | f\D>Y%)  
{ eZH~je{1  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); e`iEy=W  
 hins=AfxGetInstanceHandle(); :lgi>^  
 InitHotkey(); Ow@v"L;jF!  
 return CWinApp::InitInstance(); EiWd+v,QJQ  
} $ KB  
)T1iN(Z  
int CHookApp::ExitInstance() }^Gd4[(,g  
{ m2xBS!fm  
 VerifyWindow(); io.]'">  
 UnInit(); .IgRY\?Q  
 return CWinApp::ExitInstance(); K*Ks"Vx  
} 'H|~u&?  
qM",( Bh  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ]]2k}A[-I  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 5dl,co{q  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ W\8Ln>  
#if _MSC_VER > 1000 Z(e ^iH  
#pragma once ?qmp_2:WU  
#endif // _MSC_VER > 1000 _'!kuE,*1  
GS;%zdH~  
class CCaptureDlg : public CDialog x GH1epf  
{ )*|(i]  
 // Construction ut_pHj@  
 public: irKIy  
  BOOL bTray; k_ Y~;P@  
  BOOL bRegistered; Dz;HAyPj  
  BOOL RegisterHotkey();  \S4SI  
  UCHAR cKey; mrM4RoO  
  UCHAR cMask; Qhn;`9+L  
  void DeleteIcon(); fvqd'2 t  
  void AddIcon(); T2=HG Z  
  UINT nCount; s_[VHPN  
  void SaveBmp(); DMn4ll|  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 63 2bN=>  
  // Dialog Data z wk.bf>m  
  //{{AFX_DATA(CCaptureDlg) @MbVWiv  
  enum { IDD = IDD_CAPTURE_DIALOG }; pf&ag#nr  
  CComboBox m_Key; |^a;77nE_^  
  BOOL m_bControl; j}f[W [2  
  BOOL m_bAlt; Udgqkl  
  BOOL m_bShift; H'DVwnn>ik  
  CString m_Path; |(%zb\#9  
  CString m_Number; 8e&p\%1  
  //}}AFX_DATA !wE}(0BTx  
  // ClassWizard generated virtual function overrides @Jn!0Y1_3  
  //{{AFX_VIRTUAL(CCaptureDlg) cn`iX(ZgR  
 public: np9dM  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ny*i+4Mb  
 protected: [ f/I2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {tiKH=&J  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); >IfV\ w32  
  //}}AFX_VIRTUAL vFv3'b$;G  
  // Implementation i=S~(gp  
 protected: l \OLyQ  
  HICON m_hIcon; F@YKFk+a  
  // Generated message map functions xHA0gZf  
  //{{AFX_MSG(CCaptureDlg) >jg0s)RA'  
  virtual BOOL OnInitDialog(); zM#sOg  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %aRT>_6"  
  afx_msg void OnPaint(); ]?+{aS-]?k  
  afx_msg HCURSOR OnQueryDragIcon(); V3Z]DA  
  virtual void OnCancel(); }baR5v  
  afx_msg void OnAbout(); u=x+ J=AH  
  afx_msg void OnBrowse(); `G9 l  
  afx_msg void OnChange(); 5GzFoy)j>  
 //}}AFX_MSG 3FE(}G  
 DECLARE_MESSAGE_MAP() Xf[kI  
}; ^teq[l$;  
#endif 6%G-Vs]*2  
~`ny @WD9  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file };L ^w :  
#include "stdafx.h" ^h' Sla  
#include "Capture.h" C1kYl0 zR[  
#include "CaptureDlg.h" <ABX0U[*  
#include <windowsx.h> Ifc]K?  
#pragma comment(lib,"hook.lib") saf&dd  
#ifdef _DEBUG 2,q}N q  
#define new DEBUG_NEW c2nKPEX&5  
#undef THIS_FILE zAzP,1$?  
static char THIS_FILE[] = __FILE__; mHc>"^R  
#endif FS6`6M.K  
#define IDM_SHELL WM_USER+1  as yZe  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {i0SS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]:M0Kj&h  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; : rMM4  
class CAboutDlg : public CDialog V~G`kkNy  
{ hj%ye~|~  
 public: 9;.(u'y|  
  CAboutDlg(); D\dWt1n  
  // Dialog Data l7H qo)  
  //{{AFX_DATA(CAboutDlg) YyAJ m^o  
  enum { IDD = IDD_ABOUTBOX }; "TyJP[/  
  //}}AFX_DATA u$#Wv2|mk  
  // ClassWizard generated virtual function overrides q[q?hQ/b  
  //{{AFX_VIRTUAL(CAboutDlg) B%CTOi  
 protected: CAq/K?:8  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `.jzuX  
  //}}AFX_VIRTUAL b//B8^Eong  
  // Implementation Hb} X-6N  
 protected: JF&$t}  
  //{{AFX_MSG(CAboutDlg) 9I27TKy  
  //}}AFX_MSG sV"UI  
  DECLARE_MESSAGE_MAP() i<kD  
}; @hQlrq5c  
Q/uwQ o/  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) g- AHdYJ  
{ t7 n(Qkrv  
 //{{AFX_DATA_INIT(CAboutDlg) Q 1d'~e  
 //}}AFX_DATA_INIT '.Ed`?<p  
} NX`*%K  
R'EUV0KX>Y  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) )a 9 ]US^  
{ >(uZtYM\j  
 CDialog::DoDataExchange(pDX); y&}E~5O  
 //{{AFX_DATA_MAP(CAboutDlg) *4+3ObA  
 //}}AFX_DATA_MAP Vtc36-\1*  
} *_a@z1  
"k*PA\U  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) g VQjL+_W  
 //{{AFX_MSG_MAP(CAboutDlg) Nkxm m/Z  
 // No message handlers 0"2=n.##  
 //}}AFX_MSG_MAP m(RXJORI  
END_MESSAGE_MAP() *n" /a{6>  
UcBe'r}G  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) .+7;)K   
: CDialog(CCaptureDlg::IDD, pParent) 7S/G B  
{ HEA#bd\  
 //{{AFX_DATA_INIT(CCaptureDlg) ,@1p$n  
  m_bControl = FALSE; A+6 n#  
  m_bAlt = FALSE; \drqG&wl  
  m_bShift = FALSE; /|#&px)G  
  m_Path = _T("c:\\"); 7+X:LA~U  
  m_Number = _T("0 picture captured."); "k]CW\H6z  
  nCount=0; d ;vT ~;  
  bRegistered=FALSE; 6"Bic rY  
  bTray=FALSE; $o$ maA0  
 //}}AFX_DATA_INIT d>;&9;)H  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 2gO2jJlv  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); MZ Aij  
} R|O8RlH  
u[nyW3MZ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }cT_qqw(f%  
{ ,0x y\u  
 CDialog::DoDataExchange(pDX); pw7[y^[Qg  
 //{{AFX_DATA_MAP(CCaptureDlg) @u==x *{ |  
  DDX_Control(pDX, IDC_KEY, m_Key); 'F>'(XWWQ  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); NR;1z  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ml\4xp,  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); T]2q?; N  
  DDX_Text(pDX, IDC_PATH, m_Path); :'#TCDlOb  
  DDX_Text(pDX, IDC_NUMBER, m_Number); TXe$<4"  
 //}}AFX_DATA_MAP LP MU8Er  
} Neg,qOt  
O'Js}  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ;&1V0U,fx  
//{{AFX_MSG_MAP(CCaptureDlg) v) vkn/:  
 ON_WM_SYSCOMMAND() K~@Mg1R  
 ON_WM_PAINT() | WvUq  
 ON_WM_QUERYDRAGICON() xg)v0y~  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) PRz/inru-  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) =[F<7pvE  
 ON_BN_CLICKED(ID_CHANGE, OnChange) d&Ef"H  
//}}AFX_MSG_MAP \ Y"Wu  
END_MESSAGE_MAP() 2WU@*%sk"  
JV;OGh>  
BOOL CCaptureDlg::OnInitDialog() 76u&EG%  
{ `uC@nJ  
 CDialog::OnInitDialog(); Pp )3(T:  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ?O>V%@  
 ASSERT(IDM_ABOUTBOX < 0xF000); ,"B+r6}EF  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Iu$K i  
 if (pSysMenu != NULL) lP<:tR~K  
 { '` pDngX  
  CString strAboutMenu; Yo[;W vu  
  strAboutMenu.LoadString(IDS_ABOUTBOX); qWmQ-|Py  
  if (!strAboutMenu.IsEmpty()) YW{C} NA  
  { dd]/.Z  
   pSysMenu->AppendMenu(MF_SEPARATOR); lsJnI|  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !?|Th5e   
  } CiB%B`,N  
 } ,?L2wl[  
 SetIcon(m_hIcon, TRUE); // Set big icon rF]h$Z8o  
 SetIcon(m_hIcon, FALSE); // Set small icon qh`t-  
 m_Key.SetCurSel(0); XLH0 ;+CL{  
 RegisterHotkey(); ]CoeSA`j  
 CMenu* pMenu=GetSystemMenu(FALSE); &L^+BQ`O?  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 9uGrk^<t  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ;VWAf;U;B  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); $sEy%-  
 return TRUE; // return TRUE unless you set the focus to a control 'Fmvu   
} o<N  nV  
^<e.]F25M  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 0{= `on;  
{ 6L)%T02C  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) s0PrbL%_`  
 { ^Vpq$'!  
  CAboutDlg dlgAbout; i9/aAH0  
  dlgAbout.DoModal(); 8 XU1 /i7N  
 } 1Z9qjV%^  
 else >yULC|'F&~  
 { Z,=7Tu bR#  
  CDialog::OnSysCommand(nID, lParam); Y'ow  
 } '#k0a,<N  
} |`cKD >  
z_|/5$T>U  
void CCaptureDlg::OnPaint() dH-s2r%s  
{ @;'o2   
 if (IsIconic()) ;aw=MV  
 { ,G2TVjz  
  CPaintDC dc(this); // device context for painting 2sJ(awN>  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 92 [; Y  
  // Center icon in client rectangle 3\B>lKhQ  
  int cxIcon = GetSystemMetrics(SM_CXICON); vvm0t"|\  
  int cyIcon = GetSystemMetrics(SM_CYICON); |9B.mBoX  
  CRect rect; m%76i;uP  
  GetClientRect(&rect); ~8]NK&J  
  int x = (rect.Width() - cxIcon + 1) / 2; dxmE3*b`  
  int y = (rect.Height() - cyIcon + 1) / 2; !_"fP:T>  
  // Draw the icon Y*UA, <-  
  dc.DrawIcon(x, y, m_hIcon); Vv ?-"\Z>  
 } Ry'= ke  
 else _ A=$oVe  
 { ~m$Y$,uH  
  CDialog::OnPaint(); )gMG#>up@  
 } ~P@Q7T*  
} ypy68_xyW  
PS[+~>%  
HCURSOR CCaptureDlg::OnQueryDragIcon() f`[R7Q5  
{ BG<qIQd  
 return (HCURSOR) m_hIcon; <"_d]?,  
} IyPwP*A  
:AE&Ny4  
void CCaptureDlg::OnCancel() <>8WQn,K  
{ c`o7d)_Ke  
 if(bTray) }b-g*dn]5  
  DeleteIcon(); 9pX&ZjYP-  
  CDialog::OnCancel(); T87 m?a$  
} gntxNp[9T  
3d e_V|%  
void CCaptureDlg::OnAbout() >M`CVUf  
{ bdc&1I$  
 CAboutDlg dlg; s#WAR]x0x  
 dlg.DoModal(); K2<9mDn&  
} NB8/g0:=n&  
(,8$V\  
void CCaptureDlg::OnBrowse() [Lzw#XE  
{ oomT)gO 6*  
 CString str; 4B^ZnFJ%m  
 BROWSEINFO bi; u4/kR  
 char name[MAX_PATH]; {o>j6RS\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); nYX@J6!  
 bi.hwndOwner=GetSafeHwnd(); !Y[lQXv  
 bi.pszDisplayName=name; XR;eY:89  
 bi.lpszTitle="Select folder"; eb=D/  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; #':fkIYe'  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); hX=A)73(  
 if(idl==NULL) d&+h}O  
  return; cj1cZ-  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ekWePL;rR2  
 str.ReleaseBuffer(); f>N!wgo[  
 m_Path=str; wwyPl  
 if(str.GetAt(str.GetLength()-1)!='\\') v uoQz\  
  m_Path+="\\"; {\:{[{qF  
 UpdateData(FALSE); D>LZP!  
} ;<(W% _  
sk=-M8;\  
void CCaptureDlg::SaveBmp() 28UU60  
{ JW3B'_0  
 CDC dc; HlH64w2^R  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %*L:sTj(  
 CBitmap bm; G{6;>8h  
 int Width=GetSystemMetrics(SM_CXSCREEN); K5xX)oV  
 int Height=GetSystemMetrics(SM_CYSCREEN); orjj' +;X  
 bm.CreateCompatibleBitmap(&dc,Width,Height); LyAn&h}  
 CDC tdc; ce7CcHQ?B  
 tdc.CreateCompatibleDC(&dc); w.\&9]P3~  
 CBitmap*pOld=tdc.SelectObject(&bm); Z7=`VNHc  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .p e(lP  
 tdc.SelectObject(pOld); C,v(:ZE$J7  
 BITMAP btm; ;e1ku|>$  
 bm.GetBitmap(&btm); pLLGus+W  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Z )SY.iK.  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 2fWTY0  
 BITMAPINFOHEADER bih; ,}K7Dg^1  
 bih.biBitCount=btm.bmBitsPixel; *U P@9D  
 bih.biClrImportant=0; TztAZ2C  
 bih.biClrUsed=0; tF{D= ;G  
 bih.biCompression=0; p_${Nj  
 bih.biHeight=btm.bmHeight; a-|*?{o  
 bih.biPlanes=1; CnG+Mc^  
 bih.biSize=sizeof(BITMAPINFOHEADER); 3_MS.iM  
 bih.biSizeImage=size; iqe%=%ZR  
 bih.biWidth=btm.bmWidth; V4KMOYqm  
 bih.biXPelsPerMeter=0; 4*Hgv:0?kI  
 bih.biYPelsPerMeter=0; 0 g?z&?  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); '|Kmq5)  
 static int filecount=0; .O0 +H+  
 CString name; pQtJc*[!  
 name.Format("pict%04d.bmp",filecount++); $h*L=t(  
 name=m_Path+name; 8n*.).33  
 BITMAPFILEHEADER bfh; <w)r`D6  
 bfh.bfReserved1=bfh.bfReserved2=0; U'<KC"f:'!  
 bfh.bfType=((WORD)('M'<< 8)|'B'); /Sc l#4bW  
 bfh.bfSize=54+size; 'lEA)&d  
 bfh.bfOffBits=54; Yd#/1!A7u  
 CFile bf; {l/-LZ.  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 2kIa*#VOJ  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 7Z-O_h3;)@  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Vv.|br`;}  
  bf.WriteHuge(lpData,size); R' !  
  bf.Close(); /XzH?n/{R  
  nCount++; ,Q HU_jt  
 } u (em&M  
 GlobalFreePtr(lpData); &8g?4v  
 if(nCount==1) LQngK7>  
  m_Number.Format("%d picture captured.",nCount); 8q,6}mV  
 else <c qbUL  
  m_Number.Format("%d pictures captured.",nCount); mg$]QnbAnH  
  UpdateData(FALSE); `CgaS#  
} P dhEQ}H  
n8".XS  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) >VN5`Zlw\C  
{ '>' wK.  
 if(pMsg -> message == WM_KEYDOWN) 5sx1Zq7  
 { vM*($qpAy  
  if(pMsg -> wParam == VK_ESCAPE) q@nP}Pv&5  
   return TRUE; cM$P`{QrM  
  if(pMsg -> wParam == VK_RETURN) 8>WC5%f*  
   return TRUE; 2&^]k`Aj6D  
 } ih P|E,L=L  
 return CDialog::PreTranslateMessage(pMsg); YW60q0:  
} A8oo@z68n>  
+gJ8{u!=k  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) y*tZ !m2Gg  
{ C ihAU"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ /p+>NZ"b  
  SaveBmp(); ~1W x =  
  return FALSE; }}>q2y  
} 32/MkuY^u  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ DW_1,:,?7l  
 CMenu pop; }L#_\  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); r0,:J   
 CMenu*pMenu=pop.GetSubMenu(0); F pa_qjL;  
 pMenu->SetDefaultItem(ID_EXITICON); :F{:Z*Fi0  
 CPoint pt; ;I}kQ!q  
 GetCursorPos(&pt); q(.:9A*0  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 9&_<f}ou  
 if(id==ID_EXITICON) (<}&DE  
  DeleteIcon(); /q5v"iX]T  
 else if(id==ID_EXIT) 37|&?||  
  OnCancel(); ak |WW]R  
 return FALSE; z2QP)150  
} s1h/}  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); [N#, K02mk  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) b#hDHSdZ,  
 AddIcon(); WqXbI4;pJ  
 return res; H=Y{rq@  
} :=\Hoz  
Bhp-jq'!B  
void CCaptureDlg::AddIcon() Ire\i7MF:  
{ -< &D  
 NOTIFYICONDATA data; g#t[LI9(F[  
 data.cbSize=sizeof(NOTIFYICONDATA); }7 c[Q($K  
 CString tip;  \V*xWS  
 tip.LoadString(IDS_ICONTIP);  .5y+fL  
 data.hIcon=GetIcon(0); 1r]Io gI  
 data.hWnd=GetSafeHwnd(); ;bL EL"x%  
 strcpy(data.szTip,tip); WzF !6n!h  
 data.uCallbackMessage=IDM_SHELL; h9Y%{v  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; C@L$~iG  
 data.uID=98; ,~OwLWi-|X  
 Shell_NotifyIcon(NIM_ADD,&data); kT'u1q$3Vo  
 ShowWindow(SW_HIDE); elFtBnL'  
 bTray=TRUE; */|9= $54  
} I| b2acW  
}`,t$NV`  
void CCaptureDlg::DeleteIcon() h?;T7|^  
{ TG+VEL |T  
 NOTIFYICONDATA data; Nd cg/d  
 data.cbSize=sizeof(NOTIFYICONDATA); :X]itTrGs  
 data.hWnd=GetSafeHwnd(); 6DuEL=C  
 data.uID=98; [3--(#R\}?  
 Shell_NotifyIcon(NIM_DELETE,&data); 7TDy.]  
 ShowWindow(SW_SHOW); 86mp=6@  
 SetForegroundWindow(); Yo("U8:XX  
 ShowWindow(SW_SHOWNORMAL); Vy938qX   
 bTray=FALSE; <-D0u?8  
} w$`5g  
e^[H[d.WMC  
void CCaptureDlg::OnChange() }t%!9hr5D  
{ /S(zff[at  
 RegisterHotkey(); vbD{N3p)?n  
} YGPy@-,E  
5wh|=**/  
BOOL CCaptureDlg::RegisterHotkey() (C@~3!AVa  
{ ,]cD  
 UpdateData(); Hqn#yInA7~  
 UCHAR mask=0; MvWaB  
 UCHAR key=0; x`dHJq`_g  
 if(m_bControl) FTQ%JTgT  
  mask|=4; km1~yQ"bH  
 if(m_bAlt) 6N;wqn  
  mask|=2; -OA?BEQ=I  
 if(m_bShift) 0#S W!b|%  
  mask|=1; K?zH35f$  
  key=Key_Table[m_Key.GetCurSel()]; )l[M Q4vWW  
 if(bRegistered){ ;Mpy#yIU.  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); :9_L6  
  bRegistered=FALSE; |Clut~G  
 } f' aVV!  
 cMask=mask; D*F4it.  
 cKey=key; D6G oa(!9d  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); eQD)$d_5  
 return bRegistered; Y>EzTV  
} w`il=ZAC  
e*;c(3>(  
  四、小结 ulkJR-""&  
/U"CO8Da  
  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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