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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: : 'jVA  
  X%7l! k[  
  一、实现方法 PklJU:Pu\U  
4 .(5m\s!  
  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: aH, NS   
%[o($a$  
#pragma data_seg("shareddata") @;S)j!m`  
HHOOK hHook =NULL; //钩子句柄 q+w] Xs;  
UINT nHookCount =0; //挂接的程序数目 6G_{N.{(  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 )M7~RN  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 <9;X1XtpI  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ]2[\E~^KU  
static int KeyCount =0; [V5,1dmkI  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 =xb/zu(  
#pragma data_seg() IiX2O(*ZE  
`)BZk[64  
  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。 9wdX#=I  
t0^)Q$  
  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: IZd~Am3f  
sLK$H|%>m  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Kc>Rd  
cKey,UCHAR cMask) \vW'\}  
{ VArMFP)cz  
 BOOL bAdded=FALSE; )"E1/$*k  
 for(int index=0;index<MAX_KEY;index++){ cf%2A1I2W  
  if(hCallWnd[index]==0){ zYftgH_o  
   hCallWnd[index]=hWnd; #!r>3W&  
   HotKey[index]=cKey; FIQHs"#T  
   HotKeyMask[index]=cMask; (^<skx>  
   bAdded=TRUE; =#&+w[4?&.  
   KeyCount++; N)KN!!  
   break; T@n};,SQ  
  } ;YBk.} %  
 } w.=rea~  
 return bAdded;  4NIb_E0  
} i&)OJy  
//删除热键 8>X]wA6q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) m*KI'~#$%  
{ G12o?N0p  
 BOOL bRemoved=FALSE; %F:; A  
 for(int index=0;index<MAX_KEY;index++){ g12.4+  
  if(hCallWnd[index]==hWnd){ T[J8zL O  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /\E3p6\*  
    hCallWnd[index]=NULL; nD=N MqQ &  
    HotKey[index]=0; 1IK*j +%  
    HotKeyMask[index]=0; F9q!Upr_+  
    bRemoved=TRUE; ~P*{%=a  
    KeyCount--; Ve40H6 Ox  
    break; H*",'`|-  
   } W4nhPH(  
  } j& L@L.d  
 } ~O3VX75f  
 return bRemoved; SkU9iW(k  
} mZjP;6  
b$`/f:_  
UcB2Aauji  
  DLL中的钩子函数如下: w+XwPpM0.n  
YH{n   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?rdWhF]  
{ G P ' -  
 BOOL bProcessed=FALSE; F-D$Y?m  
 if(HC_ACTION==nCode) RXO5p d  
 { D\pX@Sx,v[  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 [X@JH6U r  
   switch(wParam) DJ!pZUO{  
   {  jk%H+<FU`  
    case VK_MENU: k<rJm P{  
     MaskBits&=~ALTBIT; acj-*I  
     break; 3u,B<  
    case VK_CONTROL: M L7vP  
     MaskBits&=~CTRLBIT; `SS[[FT$>  
     break; >U]KPL[%  
    case VK_SHIFT: WkPT6d  
     MaskBits&=~SHIFTBIT; ._&SS,I5VZ  
     break; LO38}w<k  
    default: //judge the key and send message Y&$puiH-j  
     break; LK>;\BRe?  
   } &Cr4<V6-q  
   for(int index=0;index<MAX_KEY;index++){ Z55C4F5v  
    if(hCallWnd[index]==NULL) _k(&<1i  
     continue; ]?Q<lMG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >g{b'Xx  
    { p>W@h*[6w  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); pLMaXX~4_  
     bProcessed=TRUE; 9N6 \Ou~  
    } )C rsm&  
   } 9)4_@rf%  
  }  jQ-2SA O  
  else if((lParam&0xc000ffff)==1){ //有键按下 -<(RYMk*)  
   switch(wParam) df&.!7_R`  
   { gy"<[N .?c  
    case VK_MENU: U~oGg$  
     MaskBits|=ALTBIT; [Y^h)k{-$  
     break; }gd'pgN"t  
    case VK_CONTROL: q&LCMnv"P  
     MaskBits|=CTRLBIT; ylQ9Su>o  
     break; NT9|``^Z  
    case VK_SHIFT: *thm)Mn  
     MaskBits|=SHIFTBIT; bE3mOml  
     break; 9A9T'g)Du  
    default: //judge the key and send message Qr?1\H:Lq  
     break; 8cuI-Swz  
   } X-psao0tI`  
   for(int index=0;index<MAX_KEY;index++){ vXG?8Q  
    if(hCallWnd[index]==NULL) -_Kw3x  
     continue; XaMsIyhI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;f} ']2  
    { !mUO/6Q hq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |ZOdfr4uW  
     bProcessed=TRUE; 9xFI%UOb#  
    } t~8H~%T>v  
   } C3(h j  
  } :Vw{ l B  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 9VSi2p*  
   for(int index=0;index<MAX_KEY;index++){ 'p[B`Ft3F  
    if(hCallWnd[index]==NULL) r^ABu_u(`I  
     continue; 0: B%,n UM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Sar1NkD#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .=9d3uWJ/  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Xx\,<8Xn  
   } e -b>   
  } GH`y-Ul'K  
 } 2)-4?uz~  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ?MS!t6  
} {P )O#  
`O0y8  
  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: d;{k,rP6  
Bi>]s%zp  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s5)y %, E  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %N0m$*  
"CZv5)  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: M; YJpi  
32`Z3-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) flOXV   
{ R]0`-_T  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) F 6C7k9  
 { XC O8A\  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 "akAGa!V+  
  SaveBmp(); Zx7aae_{  
  return FALSE; @|e we. r  
 } kU.@HJ[@j  
 …… //其它处理及默认处理 Qraa0]56  
} #qeC)T  
6E.[F\u  
s-~`Ao' <  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 DgB;6Wl  
_/Ay$l;F  
  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。 `g0^ W/ j  
ES8(:5  
  二、编程步骤 \r [@A3O  
7OS i2  
  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"; g1(5QWb  
):y^g:  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; U]g9t<jD  
P!!O~P  
  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; hFxT@I~  
<`wOy [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; @a,=ApS"  
z#GSt ZT  
  5、 添加代码,编译运行程序。 ;<"V}, C  
r|i)  
三、程序代码 ^dE[ ;  
W>: MK-_ J  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL NQqNBI?cr  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) N>1d]DrQR  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ef/43+F^x  
#if _MSC_VER > 1000 1/K1e$r  
#pragma once 2<:dA >1  
#endif // _MSC_VER > 1000 u! dx+vd  
#ifndef __AFXWIN_H__ ^Y5I OX:  
#error include 'stdafx.h' before including this file for PCH ]'$:Y   
#endif 0G2Y_A&e**  
#include "resource.h" // main symbols -Kcjnl92i  
class CHookApp : public CWinApp J6"GHbsO  
{ .tQ(q=#  
 public: u6| IKZ  
  CHookApp(); 4;eD}g  
  // Overrides ,s2C)bb-  
  // ClassWizard generated virtual function overrides Kf_xKW)^  
  //{{AFX_VIRTUAL(CHookApp) $`lm]} {&  
 public: \,r* -jr  
  virtual BOOL InitInstance(); ]Tg@wMgI  
  virtual int ExitInstance(); 2 )3oX  
  //}}AFX_VIRTUAL ,t:P  
  //{{AFX_MSG(CHookApp) %~,Fe7#p  
  // NOTE - the ClassWizard will add and remove member functions here. R.vOYzo  
  // DO NOT EDIT what you see in these blocks of generated code ! _x^rHADp  
  //}}AFX_MSG i ^2A:6}?  
  DECLARE_MESSAGE_MAP() uh\Tf5  
}; u|6-[I  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); oJ`=ob4WDo  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]'w5s dP  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {3kz\FS  
BOOL InitHotkey(); uZ'Z-!=CL  
BOOL UnInit(); g,W34*7=Q  
#endif xEeHQ7J  
PN:`SWP  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. [x]~G  
#include "stdafx.h" Ih4$MG6QC  
#include "hook.h" fNfa.0 s  
#include <windowsx.h> Ajo IL  
#ifdef _DEBUG -=5~-72~  
#define new DEBUG_NEW 6NHP/bj<1V  
#undef THIS_FILE ]cVDXLj$  
static char THIS_FILE[] = __FILE__; \u))1zRd  
#endif &\b(  
#define MAX_KEY 100 ;jN1n xF  
#define CTRLBIT 0x04 md!!$+a%|  
#define ALTBIT 0x02 bf {_U%`  
#define SHIFTBIT 0x01 9)o@d`*  
#pragma data_seg("shareddata") F w t  
HHOOK hHook =NULL; w{So(AF  
UINT nHookCount =0; \sfc!5G  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ^:}C,lIrG  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT y6x./1Nb}<  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey FK94CI  
static int KeyCount =0; `!(%R k  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift NffKK:HvBB  
#pragma data_seg() p<}y'7(  
HINSTANCE hins; r/"^{0;F{W  
void VerifyWindow(); pU'>!<zGr  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) B([-GpZt[  
//{{AFX_MSG_MAP(CHookApp) 'J5F+, \Ka  
// NOTE - the ClassWizard will add and remove mapping macros here. K2e *AE*  
// DO NOT EDIT what you see in these blocks of generated code! (n7{?`Yid  
//}}AFX_MSG_MAP #g0N/  
END_MESSAGE_MAP() x$D^Bh,  
9yWf*s<  
CHookApp::CHookApp() ,^Q~w b!{  
{ %lGOExV%  
 // TODO: add construction code here, dU2;   
 // Place all significant initialization in InitInstance !`1m.  
} >VQLC&u(  
svb7-.!  
CHookApp theApp; X(rXRP#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) r>TOJVT&]  
{ 9F?-zn;2s  
 BOOL bProcessed=FALSE; CQ^(/B^c  
 if(HC_ACTION==nCode) ,S(s  
 { 5MD'AP:  
  if((lParam&0xc0000000)==0xc0000000){// Key up 5?? }9  
   switch(wParam) ysl#Rwt/2  
   { yWE\)]9  
    case VK_MENU: D .LR-Z  
     MaskBits&=~ALTBIT; [@8po-()L  
     break; kWy@wPqms  
    case VK_CONTROL: MPy>< J  
     MaskBits&=~CTRLBIT; `Syfl^9B  
     break; 1 A0BM  
    case VK_SHIFT: ~J> ;l s1  
     MaskBits&=~SHIFTBIT; Y4swMN8Bq  
     break; }Nwp{["}]L  
    default: //judge the key and send message IYXN}M.=  
     break; yjH'<  
   } \%.oi@A  
   for(int index=0;index<MAX_KEY;index++){ jYFmL_{  
    if(hCallWnd[index]==NULL) t u{~:Z(  
     continue; #s15AyKz5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3 H5  
    { b4bd^nrqV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?Tu=-ppw  
     bProcessed=TRUE; =T&<z_L  
    } e84%Y8,0  
   } 9y;}B y  
  } NA'45}fQ  
  else if((lParam&0xc000ffff)==1){ //Key down '@h  
   switch(wParam) jw {B8<@s  
   { _z{9V7n4  
    case VK_MENU: q(^iT~}  
     MaskBits|=ALTBIT; ITTEUw~+o  
     break; EG$-D@o\I  
    case VK_CONTROL: W6i9mER-  
     MaskBits|=CTRLBIT; W*CRxGyZCl  
     break; VwZ~ntk  
    case VK_SHIFT: ;in-)`UC!  
     MaskBits|=SHIFTBIT; Q^nf D  
     break; cfa1"u""e  
    default: //judge the key and send message _@[W[= |H  
     break; 6 R})KIG  
   } U`HY eJ  
   for(int index=0;index<MAX_KEY;index++) !6RDq`  
   { 3&AJN#c  
    if(hCallWnd[index]==NULL) Ba|}$jo  
     continue; q*` m%3{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qQG? k~r  
    { rxyeix  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); JS%LJ _J  
     bProcessed=TRUE; \4G9YK-N>  
    } (l-= /6-  
   } Zl3e=sg=  
  } |3!)  
  if(!bProcessed){ ha=2isq  
   for(int index=0;index<MAX_KEY;index++){ *?HoN;^  
    if(hCallWnd[index]==NULL) HF_8661g  
     continue; 1Q? RD%lkf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) PlLt^q.z[  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); X#JUorGp  
   } 0'$67pY  
  } lN,a+S/'  
 } r hucBm  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Og1vD5a  
} y_Urzgm(  
F`x_W;\  
BOOL InitHotkey() <f8j^  
{ z |~+0  
 if(hHook!=NULL){ Dv/7 w[F  
  nHookCount++; h4|}BGO  
  return TRUE; <,n:w[+!`P  
 } 4m91XD  
 else V,d\Wkk/  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); O_4B> )zd  
  if(hHook!=NULL) #Pf<2S  
   nHookCount++; <4vCx  
  return (hHook!=NULL); JJ_ Z{  
} ~S;-sxoO0l  
BOOL UnInit() R5^6Kwu  
{ E&y)`>Nq{  
 if(nHookCount>1){ M."/"hV`-  
  nHookCount--; ([>__c/Nd  
  return TRUE; Y)pop :y t  
 } ]j6pd*H  
 BOOL unhooked = UnhookWindowsHookEx(hHook); . <z7$lz\  
 if(unhooked==TRUE){ 2(l0Lq*  
  nHookCount=0; "B (?|r%  
  hHook=NULL; 3.BUWMD  
 } u^{p' a'  
 return unhooked; js <Up/1  
} @_-,Q5  
-k8sR1(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =d^hiR!GN  
{ (&/4wI^M  
 BOOL bAdded=FALSE; \OFmd!Cz  
 for(int index=0;index<MAX_KEY;index++){ zm5Pl G  
  if(hCallWnd[index]==0){ S qb>a j  
   hCallWnd[index]=hWnd; #!UJY%c ~  
   HotKey[index]=cKey; `P !idg*  
   HotKeyMask[index]=cMask; pInEB6L.P  
   bAdded=TRUE; Y!_c/!Tx  
   KeyCount++; #\Rxqh7  
   break; YF-E1`+?<  
  } 1 @t.J>  
 } 0q-lyVZ^X  
 return bAdded; 7>O`UT<t4@  
} 8uLS7\,$z  
o)@nnqa  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) kG!hqj  
{ xlwf @XW  
 BOOL bRemoved=FALSE; Nr2,m"R{  
 for(int index=0;index<MAX_KEY;index++){ F9K0  
  if(hCallWnd[index]==hWnd){ (P-^ PNz&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ PLs`Ci|`  
    hCallWnd[index]=NULL; tR'RB@kJ  
    HotKey[index]=0; M`'DD-Q  
    HotKeyMask[index]=0; 8Z9>h:c1  
    bRemoved=TRUE; ez[x8M>  
    KeyCount--; {._'Q[  
    break; _%D7D~2r|  
   } e8xq`:4Y  
  } [[AO6.Z  
 } B47I?~{  
 return bRemoved; o(Z~J}l({  
} cw 2!V@  
54>0Dv??H  
void VerifyWindow() O]=jI  
{ 1aRTvaGo  
 for(int i=0;i<MAX_KEY;i++){ bs)wxU`Q*  
  if(hCallWnd!=NULL){ \l /}` w  
   if(!IsWindow(hCallWnd)){ *|\bS "  
    hCallWnd=NULL; bs ~P  
    HotKey=0; C@`#@1X  
    HotKeyMask=0; Icg-rwa<Z  
    KeyCount--; v8yCf7+"  
   } [iq^'E  
  } k"DZ"JC  
 } ]9w)0iH  
} ,>6a)2xh  
N}B&(dJ  
BOOL CHookApp::InitInstance() #9DJk,SP  
{ hui #<2{  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); n)q8y0if  
 hins=AfxGetInstanceHandle(); 0:[A4S`X  
 InitHotkey(); 0/f|ZH ~!  
 return CWinApp::InitInstance(); ,(x` zpp _  
} }>BNdm"Er  
Bj \ x  
int CHookApp::ExitInstance() K a(B&.  
{ '{ =F/q  
 VerifyWindow(); P`Ku. ONQ  
 UnInit(); Q34u>VkdQI  
 return CWinApp::ExitInstance(); gF)-Ci  
} `f~bnL  
j`.&4.7+  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file # f-hI  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) }a5TY("d9H  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ y<- ]'Yts  
#if _MSC_VER > 1000 gtMR/P:S  
#pragma once Fik ;hB  
#endif // _MSC_VER > 1000 "0;WYw?  
7:vl -ZW  
class CCaptureDlg : public CDialog k0V]<#h87  
{ r7R'beiH  
 // Construction z3S"1L7  
 public: =h-E N_[  
  BOOL bTray; |Sjy   
  BOOL bRegistered; !% W5@tN  
  BOOL RegisterHotkey(); F6yFKNK!n  
  UCHAR cKey; pI K:$eN!/  
  UCHAR cMask; us|Hb  
  void DeleteIcon(); 1DcBF@3sWG  
  void AddIcon(); Q}B]b-c+E  
  UINT nCount; \a;xJzc9  
  void SaveBmp(); (jU_lsG  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor UwS7B~  
  // Dialog Data Iga +8k  
  //{{AFX_DATA(CCaptureDlg) Y2l;NSWU  
  enum { IDD = IDD_CAPTURE_DIALOG }; 8o|C43Q_  
  CComboBox m_Key; '1 2*'Q+{+  
  BOOL m_bControl; RDDA^U7y#  
  BOOL m_bAlt; uNuFD|aQ.  
  BOOL m_bShift; T=-UcF  
  CString m_Path; y-.{){uaD  
  CString m_Number; M}11 tUl  
  //}}AFX_DATA |A*4Fuc&  
  // ClassWizard generated virtual function overrides 7=?!B#hm !  
  //{{AFX_VIRTUAL(CCaptureDlg) G5U?]& I8  
 public: BXdk0  
  virtual BOOL PreTranslateMessage(MSG* pMsg); `W)?d I?#M  
 protected: ~Oq _lM  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7M~/ q.  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?C fQwY#N  
  //}}AFX_VIRTUAL }W 5ks-L6  
  // Implementation u5Z yOZ;  
 protected: ~3gazTe9  
  HICON m_hIcon; l@GJcCufE  
  // Generated message map functions hE=xS:6  
  //{{AFX_MSG(CCaptureDlg) 6ZHeAb]"  
  virtual BOOL OnInitDialog(); 3^wHL:u  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !6X6_ +}M  
  afx_msg void OnPaint(); P/ 6$TgQ  
  afx_msg HCURSOR OnQueryDragIcon(); v?]a tb/h`  
  virtual void OnCancel(); ^TZmc{i  
  afx_msg void OnAbout(); hL/u5h%$  
  afx_msg void OnBrowse(); Rf`_q7fm  
  afx_msg void OnChange(); %b*N.v1+  
 //}}AFX_MSG 'q:7PkN!p  
 DECLARE_MESSAGE_MAP() LRu*%3xx  
}; yKj}l,i~8  
#endif <\$"U5"`  
1K/ :  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 1HNP@9ga  
#include "stdafx.h" F!hjtIkPj  
#include "Capture.h" #3_g8ni5X  
#include "CaptureDlg.h" 9VTAs:0D=  
#include <windowsx.h> )ddJ\:  
#pragma comment(lib,"hook.lib") R$l- 7YSt  
#ifdef _DEBUG bFN/{^SB  
#define new DEBUG_NEW n7;jME/!  
#undef THIS_FILE V0>[bzI  
static char THIS_FILE[] = __FILE__; up['<Kt+a  
#endif L$O\fhO?  
#define IDM_SHELL WM_USER+1 ^ICSh8C  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); h&L-G j  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G.L}VpopM  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; /# Jvt  
class CAboutDlg : public CDialog rAHP5dx:  
{ p({@t=L3g  
 public: GO2q"a  
  CAboutDlg(); Pi5MFw'v  
  // Dialog Data !\{2s!l~  
  //{{AFX_DATA(CAboutDlg) r3' DXP  
  enum { IDD = IDD_ABOUTBOX }; ?F]P=S:x  
  //}}AFX_DATA Xux[  
  // ClassWizard generated virtual function overrides @ntwdv;  
  //{{AFX_VIRTUAL(CAboutDlg) rz&V.,s  
 protected: iB W:t  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support XZk%5t|t  
  //}}AFX_VIRTUAL c.LRS$o/j  
  // Implementation /dg?6XT/  
 protected: Rkk`+0K7$J  
  //{{AFX_MSG(CAboutDlg) j~\FDcG*ed  
  //}}AFX_MSG g)Hsd0  
  DECLARE_MESSAGE_MAP() .?3ro Q  
}; x*F- d2D  
Mx, 5  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) /q>ExXsEC  
{ bf.+Ewb(  
 //{{AFX_DATA_INIT(CAboutDlg) tgCp2 `n  
 //}}AFX_DATA_INIT QChWy`x  
} +~G:z|k  
(@*|[wN  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) p<dw  C"z  
{ S[9b I&C  
 CDialog::DoDataExchange(pDX); -eK0 +beQ  
 //{{AFX_DATA_MAP(CAboutDlg) b*S,8vE]  
 //}}AFX_DATA_MAP ,{:qbt  
} eSObOG/  
VFZyWX@#u  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ~28{BY  
 //{{AFX_MSG_MAP(CAboutDlg) [>GblL  
 // No message handlers ]aMDx>OE  
 //}}AFX_MSG_MAP Jgr;'U$  
END_MESSAGE_MAP() f eB ?  
3C!|!N1Hn  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 5s^vC2$)  
: CDialog(CCaptureDlg::IDD, pParent) Wx3DWY;  
{ r]xN&Ne5Q  
 //{{AFX_DATA_INIT(CCaptureDlg) N9d^;6;i  
  m_bControl = FALSE; V+1c<LwT  
  m_bAlt = FALSE; r0k :RJP  
  m_bShift = FALSE; x1wD`r  
  m_Path = _T("c:\\"); H(n fHp.3  
  m_Number = _T("0 picture captured."); S"Vr+x?  
  nCount=0; "dv\ 9O  
  bRegistered=FALSE; u y"i3xD6-  
  bTray=FALSE; NMw5ixl  
 //}}AFX_DATA_INIT c %Y *XJ'  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 @6DKw;Q  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); |b='DJz2  
} bt1bTo  
-}T7F+  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) K'8?%&IQ  
{ 4IW90"uc  
 CDialog::DoDataExchange(pDX); # {k$Fk  
 //{{AFX_DATA_MAP(CCaptureDlg) Gl{'a1  
  DDX_Control(pDX, IDC_KEY, m_Key); qOpwl*?x+  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); tOnOzD  
  DDX_Check(pDX, IDC_ALT, m_bAlt); /KnIU|;  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); )ZLj2H<  
  DDX_Text(pDX, IDC_PATH, m_Path); g$)0E<  
  DDX_Text(pDX, IDC_NUMBER, m_Number); _+)OL-  
 //}}AFX_DATA_MAP [?<v|k  
} K($+ILZ  
g8Y)90 G  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 6w3[PNd  
//{{AFX_MSG_MAP(CCaptureDlg) 0# 1~'e  
 ON_WM_SYSCOMMAND() P;y!Y/$C  
 ON_WM_PAINT() ^=-25%&^  
 ON_WM_QUERYDRAGICON() n@kJ1ee'  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) h){#dU+&  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) @/As|)  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 4?(=?0/[  
//}}AFX_MSG_MAP (K6vXq.;\\  
END_MESSAGE_MAP() A6_ER&9$>N  
N!?~Dgw  
BOOL CCaptureDlg::OnInitDialog() &~.|9P/45  
{ E 8W*^^z(  
 CDialog::OnInitDialog(); SLkgIb~'X  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); M^l%*QF[,q  
 ASSERT(IDM_ABOUTBOX < 0xF000); ueW/i  
 CMenu* pSysMenu = GetSystemMenu(FALSE); e]!`94f  
 if (pSysMenu != NULL) s]=XAm"4  
 { 0#yH<h$   
  CString strAboutMenu; ?^-fivzS>  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 4>Ht_B<<  
  if (!strAboutMenu.IsEmpty()) H 9/m6F  
  { er 1zSTkg  
   pSysMenu->AppendMenu(MF_SEPARATOR); `3K."/N6c  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); B "4A1!  
  } Ls|)SiXrY  
 } kW%wt1",  
 SetIcon(m_hIcon, TRUE); // Set big icon yoq-H+<  
 SetIcon(m_hIcon, FALSE); // Set small icon P&c O2  
 m_Key.SetCurSel(0); vqUYr  
 RegisterHotkey(); (NnE\2  
 CMenu* pMenu=GetSystemMenu(FALSE); hP[/xe  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); x5rm 2C  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); j}@LiH'Q  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); qa: muW  
 return TRUE; // return TRUE unless you set the focus to a control Ygfy;G%  
} OL#i!ia.  
'R$/Qt;uA  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 5A %TpJ  
{ k+@ :+ RL  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) g:c?%J  
 { 9ygNJX'~  
  CAboutDlg dlgAbout; /NPx9cLW^  
  dlgAbout.DoModal(); fWg 3gRI  
 } 7S= ]@*  
 else [ryII hQ  
 { E'+z.~+  
  CDialog::OnSysCommand(nID, lParam); %AT/g&M&1#  
 } VD,g3B p  
} -yIx:*KI  
~:C`e4  
void CCaptureDlg::OnPaint() 7we='L&R  
{ /8dRql-Ne  
 if (IsIconic()) SZxnYVY  
 {  HsG3s?*  
  CPaintDC dc(this); // device context for painting V+})$m*>  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ] :](xW%  
  // Center icon in client rectangle qw|B-lT{:  
  int cxIcon = GetSystemMetrics(SM_CXICON); n%vmo f  
  int cyIcon = GetSystemMetrics(SM_CYICON); "0>AefFd#  
  CRect rect; 6lr<{k7Nw  
  GetClientRect(&rect); 6: R1jF*eG  
  int x = (rect.Width() - cxIcon + 1) / 2; r5lPO*?Df  
  int y = (rect.Height() - cyIcon + 1) / 2; Fkqw #s(T  
  // Draw the icon Aba%QQQ  
  dc.DrawIcon(x, y, m_hIcon); z+_d*\  
 } [w  FK!?  
 else _lH:%E*  
 { @%MGLR{pH  
  CDialog::OnPaint(); (c3O> *M  
 } ,k:>Z&:  
} @9]TjZd  
-Y"2c,~pH  
HCURSOR CCaptureDlg::OnQueryDragIcon() gazX2P[D  
{ FYg{IKg  
 return (HCURSOR) m_hIcon; 77]Fp(uI  
} 6%c]{eTd9  
VB+_ kR6Zv  
void CCaptureDlg::OnCancel() ?%>S5,f_  
{ 8js1m55KT  
 if(bTray) >\lBbq a#  
  DeleteIcon(); HErG%v]nw  
  CDialog::OnCancel(); o8A(Cg}  
} [;C*9Nl  
5S! !@P!,  
void CCaptureDlg::OnAbout() K[-G2  
{ )4GCL(&  
 CAboutDlg dlg; !|,djo!N  
 dlg.DoModal(); *2m{i:3  
} <{HV|B7  
wX@g >(  
void CCaptureDlg::OnBrowse() ~P-^An^  
{ Fe 7 8YDx?  
 CString str; uH} }z!  
 BROWSEINFO bi; c`)[-  
 char name[MAX_PATH]; k#5Qwxu`  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); $C{-gx+:  
 bi.hwndOwner=GetSafeHwnd(); ]PH'G>x  
 bi.pszDisplayName=name; 9$R}GK  
 bi.lpszTitle="Select folder"; )*BG-nM u  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; jpiBHi]5+  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); CY@#_z  
 if(idl==NULL) Q\le3KB  
  return; NrcxuItkYn  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); t8#u}u  
 str.ReleaseBuffer(); +=L^h9F  
 m_Path=str; <)oW  
 if(str.GetAt(str.GetLength()-1)!='\\') m8* )@e  
  m_Path+="\\"; AHP;N6Y6  
 UpdateData(FALSE); 2J6(TrQ  
} #ChF{mh  
0ol*!@?  
void CCaptureDlg::SaveBmp() _/}/1/y$Y  
{ Bh q]h  
 CDC dc; eC$ Jdf  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); b;G#MjQp'  
 CBitmap bm; 3gs7Xj%N  
 int Width=GetSystemMetrics(SM_CXSCREEN); Gl>*e|}  
 int Height=GetSystemMetrics(SM_CYSCREEN); JjH141 n%D  
 bm.CreateCompatibleBitmap(&dc,Width,Height); &UX:KW`=  
 CDC tdc; \2 `|eo  
 tdc.CreateCompatibleDC(&dc); gCI{g. [I!  
 CBitmap*pOld=tdc.SelectObject(&bm); T^nOv2@,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); S),acc(d  
 tdc.SelectObject(pOld); H')8p;~{}  
 BITMAP btm; I^gLiLUN*6  
 bm.GetBitmap(&btm); 2Ni {fC?  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; gp]T.ol  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &>Nw>V  
 BITMAPINFOHEADER bih; kfs[*ku  
 bih.biBitCount=btm.bmBitsPixel; Uj)`(}r  
 bih.biClrImportant=0; zhC5%R &n/  
 bih.biClrUsed=0; K!|J/W  
 bih.biCompression=0; =D^R,Q  
 bih.biHeight=btm.bmHeight; J+Zp<Wu-  
 bih.biPlanes=1; z7O$o/E-*  
 bih.biSize=sizeof(BITMAPINFOHEADER); s>e)\9c  
 bih.biSizeImage=size; m+dJ3   
 bih.biWidth=btm.bmWidth; >+ku:<Hw%.  
 bih.biXPelsPerMeter=0; ys} I~MK-  
 bih.biYPelsPerMeter=0; EpH\;25u  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); z CFXQi  
 static int filecount=0; FWQNO(  
 CString name; Ibu  5  
 name.Format("pict%04d.bmp",filecount++); r[KX"U-  
 name=m_Path+name; 6F3FcUL  
 BITMAPFILEHEADER bfh; p']oy;t  
 bfh.bfReserved1=bfh.bfReserved2=0; qbD[<T  
 bfh.bfType=((WORD)('M'<< 8)|'B'); IFW"S fdZk  
 bfh.bfSize=54+size; 0{.[#!CSk  
 bfh.bfOffBits=54; t|}}#Z!I[f  
 CFile bf; ,-5|qko=  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ !s[[X5  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); iiTt{ab\Y  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); JR4fJG  
  bf.WriteHuge(lpData,size); :z%q09.)  
  bf.Close(); %1kIaYZ  
  nCount++; <2fgao&-n  
 } 7NQEnAl  
 GlobalFreePtr(lpData); yo!Y%9  
 if(nCount==1) kuo!}QFL  
  m_Number.Format("%d picture captured.",nCount); 7toDk$jJRg  
 else *L#\#nh7  
  m_Number.Format("%d pictures captured.",nCount); mBg$eiGTB  
  UpdateData(FALSE); yey]#M[y  
} t/(rB}  
Na$[nv8qh  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) h%>yErs  
{ (cm8x  
 if(pMsg -> message == WM_KEYDOWN) EVDcj,b"^  
 { lWk/vj<5  
  if(pMsg -> wParam == VK_ESCAPE) 'DtC=  
   return TRUE; 9 kLA57  
  if(pMsg -> wParam == VK_RETURN) }<=_&n  
   return TRUE; "<yJ<lS&>  
 } a3SBEkC  
 return CDialog::PreTranslateMessage(pMsg); Q-y`IPtA<  
} J*+[?FXRL  
Ew*SA  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) irKM?#h  
{ 9qX)FB@'i;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ e# z#bz2<  
  SaveBmp(); $'93:9tg  
  return FALSE; F0/!+ho  
} T3h1eU  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ N<T@GQwkS  
 CMenu pop; `clp#l.ii  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); M.fA5rJ^  
 CMenu*pMenu=pop.GetSubMenu(0); "{M?,jP#  
 pMenu->SetDefaultItem(ID_EXITICON); $9?<mP2-*  
 CPoint pt; hf< [$B  
 GetCursorPos(&pt); @5*$yi 'Cp  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); -s9()K(vZG  
 if(id==ID_EXITICON) #,Cz+ k*4  
  DeleteIcon(); sTw+.m{F  
 else if(id==ID_EXIT) ^_\%?K_u  
  OnCancel(); U*7x81v?j  
 return FALSE; |?4NlB6  
} "WzD+<oL  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -nDY3$U/  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) f}w_]l#[G  
 AddIcon(); y=SVS3D  
 return res; J1@skj4#\~  
} !:M+7kmr7t  
KLgg([  
void CCaptureDlg::AddIcon() <,,X\>B  
{ FPukV^  
 NOTIFYICONDATA data; kt7x}F(?<  
 data.cbSize=sizeof(NOTIFYICONDATA); EjP9/V G@=  
 CString tip; l9f%?<2D  
 tip.LoadString(IDS_ICONTIP); xt1\Sie  
 data.hIcon=GetIcon(0); ^JAp#?N^9  
 data.hWnd=GetSafeHwnd(); I9*BT T]  
 strcpy(data.szTip,tip); 3_ko=& B$  
 data.uCallbackMessage=IDM_SHELL; (ty&$  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 5+a5p C  
 data.uID=98; >Xw0i\G  
 Shell_NotifyIcon(NIM_ADD,&data); =TJ9Gr/R&:  
 ShowWindow(SW_HIDE); hr3<vWAD  
 bTray=TRUE; puox^  
} $) m$ c5!  
Tb}op XYK  
void CCaptureDlg::DeleteIcon() 1G )I|v9R  
{ w/csLi.O  
 NOTIFYICONDATA data; PP8627uP  
 data.cbSize=sizeof(NOTIFYICONDATA); %F13*hOu  
 data.hWnd=GetSafeHwnd(); 8T88  
 data.uID=98; /cZTj!M  
 Shell_NotifyIcon(NIM_DELETE,&data); }/M muPp  
 ShowWindow(SW_SHOW); lESv  
 SetForegroundWindow(); ^o4](l  
 ShowWindow(SW_SHOWNORMAL); &1ZUMc  
 bTray=FALSE; oqbhb1D1<  
} XvVi)`8!u  
+`uNO<$~f  
void CCaptureDlg::OnChange() c/E'GG%Q%  
{ _RE;}1rb,  
 RegisterHotkey(); vH/RP  
}  w>\_d  
WaSZw0U}y  
BOOL CCaptureDlg::RegisterHotkey() 06]"{2  
{ J;'H],w}f  
 UpdateData(); 5}Z>N,4  
 UCHAR mask=0; fGoJP[ae  
 UCHAR key=0; wU|jw(  
 if(m_bControl) ic}mru  
  mask|=4; L}rYh`bUP[  
 if(m_bAlt) 0X5b32  
  mask|=2; K #}t\  
 if(m_bShift) /h8100  
  mask|=1; r+;k(HMY}[  
  key=Key_Table[m_Key.GetCurSel()]; h.q9p!  
 if(bRegistered){ Zxh<pd25Y  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 1)!2D?w  
  bRegistered=FALSE; q7<=1r+  
 } JJ9R, 8n6  
 cMask=mask; o pTH6a  
 cKey=key; WjOP2CVv|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $$i Gs6az  
 return bRegistered; #n]K$k>  
} oxL)Jx\c9A  
MV]`[^xQ5  
  四、小结 C-XJe~  
6q^\pJY%&7  
  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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