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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: 'uOzC"_yF  
  z7P] g C$\  
  一、实现方法 Bpw<{U  
Rr>h8Ni <  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: hPHrq{YZ  
Du2v,n5@  
#pragma data_seg("shareddata") d~b#dcv$"  
HHOOK hHook =NULL; //钩子句柄 vAMr&[  
UINT nHookCount =0; //挂接的程序数目 j L[ hB  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Y2,\WKa  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 j,/t<@S>  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey XUyoZl?  
static int KeyCount =0; .wfN.Z  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Z*rA~`@K6  
#pragma data_seg() Ut xe  
d@72z r  
  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。 ^BFD -p  
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  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: (\6R"2  
dnP3{!"b  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR _("&jfn  
cKey,UCHAR cMask) ?w[M{   
{ g$f ;  
 BOOL bAdded=FALSE; 8>|@O<2\  
 for(int index=0;index<MAX_KEY;index++){ HBFuA.",  
  if(hCallWnd[index]==0){ =_L  
   hCallWnd[index]=hWnd; _~ipO1*  
   HotKey[index]=cKey; mrfc.{`[  
   HotKeyMask[index]=cMask; !F|iL  
   bAdded=TRUE; UUt631  
   KeyCount++; <C'S#5,2  
   break; Ay Obaa5  
  } %Jpb&CEY  
 } =!`\=!y  
 return bAdded; >5jHgs#  
} Uieg4Iro  
//删除热键 UT9=S21  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) j;k(AM<  
{ 92k}ON  
 BOOL bRemoved=FALSE; -~HlME *~f  
 for(int index=0;index<MAX_KEY;index++){ e]+ [lq\p@  
  if(hCallWnd[index]==hWnd){ V!S B9t`E  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (1vmtg.O  
    hCallWnd[index]=NULL; CKTD27})  
    HotKey[index]=0; 0CD2o\`8  
    HotKeyMask[index]=0; G"BoD5m  
    bRemoved=TRUE; X&<#3n  
    KeyCount--; -^ (NIl'  
    break; L^`oJ9k!  
   } M]>JI'8  
  } N -]m <z>  
 } y{eZrX|  
 return bRemoved; }<wj~f([  
} R<!WW9IM  
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  DLL中的钩子函数如下: _]=`F l  
i`g>Y5   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) &\C{,:[  
{ rr[9sk`^H  
 BOOL bProcessed=FALSE; bz~-uHC  
 if(HC_ACTION==nCode) _l?5GLl_F$  
 { ^/Hj^4~_U  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 wBcDL/(>  
   switch(wParam) DOXRU5uP3  
   {  ~~ON!l9n  
    case VK_MENU: >oc7=F<8lS  
     MaskBits&=~ALTBIT; Lh &L5p7  
     break; } V4"-;P  
    case VK_CONTROL:  *ihg'  
     MaskBits&=~CTRLBIT; Kg@9kJB  
     break; n#N<zC/  
    case VK_SHIFT: |jV4]7Luq  
     MaskBits&=~SHIFTBIT; dBG]J18  
     break;  <C4^Vem  
    default: //judge the key and send message X/1Z9 a+W  
     break; q\[31$i$  
   } w9}I*Nra  
   for(int index=0;index<MAX_KEY;index++){ l1o dkNf|  
    if(hCallWnd[index]==NULL) rr4yJ;qpeP  
     continue; IBVP4&}x$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -}UC daQ3  
    { 0EXAdRR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); kmW!0hm;e  
     bProcessed=TRUE; lb1(1 |#  
    } pAmTwe  
   } U gB  
  } B`hxF(_p/  
  else if((lParam&0xc000ffff)==1){ //有键按下 LFSOHJj  
   switch(wParam) JoZC+G  
   { 0;TMwE  
    case VK_MENU: sZ'3PNpCP  
     MaskBits|=ALTBIT; O)5-6lm  
     break; aG |)k,  
    case VK_CONTROL: !9o8v0ZI  
     MaskBits|=CTRLBIT; )K2n!Fbd  
     break; NUL~zb  
    case VK_SHIFT: #G#gB   
     MaskBits|=SHIFTBIT; p,D/ Pb8  
     break; I{cn ,,8  
    default: //judge the key and send message U(./LrM05  
     break; 4r(rWlM  
   } ]Ly)%a32  
   for(int index=0;index<MAX_KEY;index++){ 'd?8OV  
    if(hCallWnd[index]==NULL) Gz*U?R-T  
     continue; dm$:xE":  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <R{\pz2w  
    { /gFyow1W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6}ax~wYct  
     bProcessed=TRUE; ur#"f'|-  
    } 0l_-   
   } ~[9 ]M)=O0  
  } k5xirB_  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 n? s4"N6  
   for(int index=0;index<MAX_KEY;index++){ {8jG6  
    if(hCallWnd[index]==NULL) Vxgc|E^J  
     continue; ^U_jeAuk8[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6ldDt?iSg  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); fQx 4/4j  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 R4qk/@]t  
   } b'-gy0  
  } 5 ?vIkf  
 } M(3E b;`   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 6 *8Ge  
} gieX`}  
U |4% ydG  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: *gT TI;:  
hcaH   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %)aDh }  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E 0oJ|My  
^$#Q_Y|  
  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: Y66 vJ<lM  
o!H"~5Trv!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y2$ % %@  
{ 3]VTQl{P  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)  b'{D4/  
 { P7Y[?='v  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 .HtDcGp  
  SaveBmp(); 2C8M1^0:Z  
  return FALSE; vOP[ND=T  
 } *@Qt*f  
 …… //其它处理及默认处理 OQsH,'  
} cA Lu  
Ahebr{u  
X>wQYIi  
  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。 ss2:8up 99  
6% ,Q  
  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。 9SFiL#1  
LQQhn{[D  
  二、编程步骤 ):[[Ch_  
(?3( =+t  
  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"; ?NwFpSB2  
,,iQG' *  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; r-V./M@L  
'/p5tw8  
  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; l`u*,"$  
E|fPI u  
  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; G37_ `C  
. }1!MK5  
  5、 添加代码,编译运行程序。 BW*zj=N%  
3~S~)quwP  
三、程序代码 O0I/^  
"{:*fI;!  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL _6[NYv$"  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) HYY|) Wo  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ (C:rH  
#if _MSC_VER > 1000 ;}PL/L$L6;  
#pragma once N,1wfOE  
#endif // _MSC_VER > 1000 TUUBC%  
#ifndef __AFXWIN_H__ 3whyIXs  
#error include 'stdafx.h' before including this file for PCH FPMW"~v  
#endif Ar$LA"vu4  
#include "resource.h" // main symbols P"#^i<ut@T  
class CHookApp : public CWinApp Av[jFk  
{ C^~iz in  
 public: BxG;vS3>*e  
  CHookApp(); ](ninSX1w  
  // Overrides k{#:O=  
  // ClassWizard generated virtual function overrides D *tBbV  
  //{{AFX_VIRTUAL(CHookApp) 5u!cA4e"  
 public: doa$ ;=wg  
  virtual BOOL InitInstance(); f ;Dz(~ hw  
  virtual int ExitInstance(); ["7}u^z@<+  
  //}}AFX_VIRTUAL <*\J 6:^n  
  //{{AFX_MSG(CHookApp) _\<M58/z  
  // NOTE - the ClassWizard will add and remove member functions here. aG ,uF  
  // DO NOT EDIT what you see in these blocks of generated code ! &V ;a:  
  //}}AFX_MSG 'F~u \m=E  
  DECLARE_MESSAGE_MAP() +(<f(]bG  
}; BKTsc/v2>:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Psv!`K  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); xWMMHIu  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kDKpuA!  
BOOL InitHotkey(); *SW,pHYnLb  
BOOL UnInit(); @PI\.y_w  
#endif (/Mc$V  
t>[r88v  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. h Na<LZ  
#include "stdafx.h" wVVe L$28  
#include "hook.h" jL8zH  
#include <windowsx.h> /IC' R"V a  
#ifdef _DEBUG Zry>s0  
#define new DEBUG_NEW :8ZxOwwv  
#undef THIS_FILE Y `{U45  
static char THIS_FILE[] = __FILE__; q}!4b'z^  
#endif Cr` 0C  
#define MAX_KEY 100 Yc$|"to  
#define CTRLBIT 0x04 fS ~.K9  
#define ALTBIT 0x02 1m0':n Vdu  
#define SHIFTBIT 0x01 $1v5*E  
#pragma data_seg("shareddata") 0v_8YsZ!`$  
HHOOK hHook =NULL; S;NXOsSu  
UINT nHookCount =0; ![ QQF|  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey zxh"@j$?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT = `^jz}  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey gr;M  
static int KeyCount =0; NR*SEbUU*  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 7I|%GA_  
#pragma data_seg() gU?)  
HINSTANCE hins; x6t;=  
void VerifyWindow(); |^F-.Z  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) eZ!k'bS=  
//{{AFX_MSG_MAP(CHookApp) qkIU>b,B  
// NOTE - the ClassWizard will add and remove mapping macros here. $o/>wgQY-  
// DO NOT EDIT what you see in these blocks of generated code! @2mP  
//}}AFX_MSG_MAP 9ZBF1sMg  
END_MESSAGE_MAP() [a3 0iE  
"jHN#}  
CHookApp::CHookApp() CytpL`&^]  
{ pR"qPSv'  
 // TODO: add construction code here, -db+Y:xUZ  
 // Place all significant initialization in InitInstance z)%1i  
} #jX>FXo  
<}%ir,8  
CHookApp theApp; =Wf@'~K0k"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `T70FsSJ  
{ QP#Wfk(C  
 BOOL bProcessed=FALSE; #-;BU{3*  
 if(HC_ACTION==nCode) D}T, z  
 { "" U_|JH-  
  if((lParam&0xc0000000)==0xc0000000){// Key up {9Y'v  
   switch(wParam) }]I?vyQ#V  
   { $<v_Vm?6d  
    case VK_MENU: <IVz mzpL  
     MaskBits&=~ALTBIT; yShHFlO=  
     break; (5> ibe  
    case VK_CONTROL: sYXS#;|M  
     MaskBits&=~CTRLBIT; >-P0wowL  
     break; GHy#D]Z  
    case VK_SHIFT: k 3 l  
     MaskBits&=~SHIFTBIT; f[I c hCwX  
     break; i.sq^]j  
    default: //judge the key and send message guv@t&;t0  
     break; {<kG{i/  
   } z(3"\ ^T  
   for(int index=0;index<MAX_KEY;index++){ 8|({ _Z  
    if(hCallWnd[index]==NULL) vrzX%'  
     continue; `xUPML-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _ ^{Ep/ME=  
    { f[b YjIX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); N-gRfra+8L  
     bProcessed=TRUE; 6<Z: Xw  
    } E: GJ$I  
   } $J6.a!5IE  
  } .jp]S4~  
  else if((lParam&0xc000ffff)==1){ //Key down \#aVu^`eX  
   switch(wParam) 9$&e~^&B  
   { ~t={ \,X\  
    case VK_MENU: F"xO0t  
     MaskBits|=ALTBIT; ~-5@- V  
     break; iIE(zw)H  
    case VK_CONTROL: <^U(ya  
     MaskBits|=CTRLBIT; _sVs6AJ  
     break; $]kg_l)  
    case VK_SHIFT: 86#mmm)  
     MaskBits|=SHIFTBIT;  2JP?6N  
     break; U[b;#Y1X  
    default: //judge the key and send message _m],(J=,z  
     break; %v[ Kk-d  
   } @@IA35'tc  
   for(int index=0;index<MAX_KEY;index++) Wq(l :W'  
   { X:lPWz!7{  
    if(hCallWnd[index]==NULL) Net)l@IB]  
     continue; W(h8!}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N}fUBX4k  
    { N-`;\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); t1jlxK  
     bProcessed=TRUE; ht)nx,e=  
    } pFTlhj)1  
   } n=? 0g;1!  
  } "<x~{BN?  
  if(!bProcessed){ lGUV(D  
   for(int index=0;index<MAX_KEY;index++){ oDP((I2-  
    if(hCallWnd[index]==NULL) NRisr  
     continue; X5Y `(/V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) WuFwt\U  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  J4"swPf  
   } t i^v%+r1  
  } ( 'n8=J  
 } z,FTsR$x  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _I_?k+#WFe  
} 1~DD9z  
A&c@8  
BOOL InitHotkey() ]^9* t,{9  
{ O}_a3>1DY  
 if(hHook!=NULL){ UMuuf6  
  nHookCount++; EWIc|b:  
  return TRUE; 3]<re{)J9O  
 } ;#s}b1  
 else liqR#<  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); iN_D8dI  
  if(hHook!=NULL) lVdT^"~3  
   nHookCount++; *3O>J"  
  return (hHook!=NULL); zN+* R;Ds  
} xs!g{~V{  
BOOL UnInit() 1Xr"h:U_X  
{ T_?nd T2  
 if(nHookCount>1){ QZ3(u<f  
  nHookCount--; 99 "[b  
  return TRUE; hNnX-^J<o  
 } pP* ~ =?  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +}QBzGW`  
 if(unhooked==TRUE){ PCPf*G>  
  nHookCount=0; VtO;UN  
  hHook=NULL; dAr)%RZ  
 } oL Vtu5  
 return unhooked; _/}Hqh  
} & 8' (  
Y#&0x_Z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U`8 |9v  
{ ^2^|AXNES  
 BOOL bAdded=FALSE; 5!F\h'E  
 for(int index=0;index<MAX_KEY;index++){ s S5fd)x  
  if(hCallWnd[index]==0){ yd ND$@; Z  
   hCallWnd[index]=hWnd; s!ZW'`4!z  
   HotKey[index]=cKey; z8/xGQn  
   HotKeyMask[index]=cMask; wB>S\~i  
   bAdded=TRUE; <*"pra{3  
   KeyCount++; OR\DTLIl  
   break; pEVgJ/>  
  } D!}K)T1~R  
 } /.)[9bQ<  
 return bAdded; - ~\.n  
} .S!>9X,  
5m^Hi} S _  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4b2mtLn_  
{ Mf:M3H%YV+  
 BOOL bRemoved=FALSE; pAil]f6  
 for(int index=0;index<MAX_KEY;index++){ sQ}%7BMK  
  if(hCallWnd[index]==hWnd){ <s/<b*T ^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d)0LVa(  
    hCallWnd[index]=NULL; (+UmUx=  
    HotKey[index]=0; ZP6x  
    HotKeyMask[index]=0; 'Z.OF5|eGT  
    bRemoved=TRUE; aLKMDiT  
    KeyCount--; v0`qMBr1y  
    break; #_?TIY:h  
   } 'sRg4?PT  
  } 3X$Q,  
 } |'c4er/;#  
 return bRemoved; ?Z Rkn+;  
} G7Z vfLR{:  
I{42'9  
void VerifyWindow() LiZdRr  
{ Wk`bb!P_  
 for(int i=0;i<MAX_KEY;i++){ 6KEykw j  
  if(hCallWnd!=NULL){ lC=N:=Mu  
   if(!IsWindow(hCallWnd)){ }2ql?K  
    hCallWnd=NULL; 3zB|!p C6s  
    HotKey=0; > X[|c"l.  
    HotKeyMask=0; p9AZ9xr  
    KeyCount--; N )zPxQ  
   } U['JFLF  
  } rToaGQh  
 } "[*S?QO(L  
} /WgPXEB  
=Y &9 qt  
BOOL CHookApp::InitInstance() ?aFr8i:)M  
{ BFMS*t`  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 5 [ ,+\  
 hins=AfxGetInstanceHandle(); 0{?: FQ#  
 InitHotkey(); <E>7>ZL  
 return CWinApp::InitInstance(); 5=Kq@[(4  
} C}mYt/  
eC6>yD6D  
int CHookApp::ExitInstance() \ fK47oV  
{ |P~O15V*Q  
 VerifyWindow(); %/l-A pu  
 UnInit(); $A;7Em  
 return CWinApp::ExitInstance(); C}b|2y  
} #y=ZP:{:t  
R2}kz.  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file %n05 Jitl  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) sULIrYRA  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ D:wnO|:  
#if _MSC_VER > 1000 onnI !  
#pragma once t_jyyHxoZ:  
#endif // _MSC_VER > 1000 N[qA2+e$Z  
n1QEu"~Zj  
class CCaptureDlg : public CDialog `d7gm;ykp  
{ @B,j;2eb  
 // Construction o 'C~~Vg).  
 public: t=n+3`g  
  BOOL bTray; ud0QZ X  
  BOOL bRegistered; {TyCj?3B  
  BOOL RegisterHotkey(); J>`v.8y  
  UCHAR cKey; MV:W@)rg  
  UCHAR cMask; w4\BD&7V  
  void DeleteIcon(); P<%v +O  
  void AddIcon(); -xJX_6}A  
  UINT nCount; iv:,fkwG  
  void SaveBmp(); {(rf/:X!p  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor X*pZNz&E  
  // Dialog Data  T/[f5?p  
  //{{AFX_DATA(CCaptureDlg) lijB#1<8*  
  enum { IDD = IDD_CAPTURE_DIALOG }; tNK^z7Dm  
  CComboBox m_Key; oW0gU?Rr)u  
  BOOL m_bControl; vO\:vp4fH  
  BOOL m_bAlt; t]s94 R q  
  BOOL m_bShift; :?HSZocf  
  CString m_Path; %'N$l F"]  
  CString m_Number; !*&4< _  
  //}}AFX_DATA Z6 ;Wd_  
  // ClassWizard generated virtual function overrides O\6vVM[  
  //{{AFX_VIRTUAL(CCaptureDlg) B!eK!B  
 public: RX:R*{]-  
  virtual BOOL PreTranslateMessage(MSG* pMsg); -Q6(+(7_|  
 protected: 9Ei5z6Vk/+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support N99[.mErU  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ^_@r.y]  
  //}}AFX_VIRTUAL = 0 ,|/1~  
  // Implementation ]?[zx'|  
 protected: 2(pLxVl  
  HICON m_hIcon; ^^%JoQ.  
  // Generated message map functions yahAD.Xuo@  
  //{{AFX_MSG(CCaptureDlg) M~uMY+>   
  virtual BOOL OnInitDialog(); Hi^35  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); *oCxof9JA  
  afx_msg void OnPaint(); 14mf}"z\  
  afx_msg HCURSOR OnQueryDragIcon(); >K\3*]>J3  
  virtual void OnCancel(); o&~dGG4J  
  afx_msg void OnAbout(); ;;:">@5  
  afx_msg void OnBrowse(); 8qn 9|  
  afx_msg void OnChange(); OY:u',T  
 //}}AFX_MSG Us'Cs+5XcG  
 DECLARE_MESSAGE_MAP() 4S tjj!ew  
}; 0; 7#ji  
#endif `|nH1sHFq  
`%e|$pK  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;AKwx|I$g  
#include "stdafx.h" Hb+X}7c$  
#include "Capture.h" E Zi&]  
#include "CaptureDlg.h" G~"z_ (  
#include <windowsx.h> vd`O aM}#U  
#pragma comment(lib,"hook.lib") PSPTL3_~  
#ifdef _DEBUG @Tm`d ?^  
#define new DEBUG_NEW }3Qc 24`  
#undef THIS_FILE @K\o4\  
static char THIS_FILE[] = __FILE__; sm0fAL  
#endif ]% K' fXj$  
#define IDM_SHELL WM_USER+1 oB p3JX9_f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0LdJZP  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K4:  $=  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; +~N!9eMc  
class CAboutDlg : public CDialog =~&VdPZ  
{ )>V?+L5M  
 public: ;+a2\j+  
  CAboutDlg(); msiu8E  
  // Dialog Data !}_b|  
  //{{AFX_DATA(CAboutDlg) m^<p8KZ  
  enum { IDD = IDD_ABOUTBOX }; RND9D\7  
  //}}AFX_DATA =_l)gx+Y+y  
  // ClassWizard generated virtual function overrides P;73Hr[E#  
  //{{AFX_VIRTUAL(CAboutDlg) }Al YNEY  
 protected: zEj#arSE4  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L_~8"I_  
  //}}AFX_VIRTUAL /& r|ec5  
  // Implementation +"dv7  
 protected: KFU%DU G  
  //{{AFX_MSG(CAboutDlg) z8E1m"  
  //}}AFX_MSG QOH<]~3J  
  DECLARE_MESSAGE_MAP() {L].T#  
}; BgM%+b8u  
k=$AhT=e}n  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) (,B#t7ka  
{ f"dSr  
 //{{AFX_DATA_INIT(CAboutDlg) s3:9$.tiR[  
 //}}AFX_DATA_INIT O(c@PJem  
} :S -";.:"  
DN_W.o  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) RO.U(T  
{ <F(><Xw,-4  
 CDialog::DoDataExchange(pDX); XRxj  W  
 //{{AFX_DATA_MAP(CAboutDlg) 2}vNSQvG  
 //}}AFX_DATA_MAP !X]8dyW  
} uH:YKH':/  
\F{:5,Du)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) :5b0np!  
 //{{AFX_MSG_MAP(CAboutDlg) ~E)fpGJ  
 // No message handlers 9%tobo@J~n  
 //}}AFX_MSG_MAP ?s2^zT  
END_MESSAGE_MAP() Su7bm1  
[ *>AN7W   
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) V kjuyK  
: CDialog(CCaptureDlg::IDD, pParent) aJzLrX  
{ y t5H oy  
 //{{AFX_DATA_INIT(CCaptureDlg) -DjJ",h( $  
  m_bControl = FALSE; mV)+qXC  
  m_bAlt = FALSE; pr&=n;_ n  
  m_bShift = FALSE; /<{:I \<  
  m_Path = _T("c:\\"); Dd,2;#_  
  m_Number = _T("0 picture captured."); 5)UQWnd5  
  nCount=0; dg_Gs>?2  
  bRegistered=FALSE; > ' i  
  bTray=FALSE; iOCqE 5d3  
 //}}AFX_DATA_INIT bm# (?  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ++jAz<46  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 4<gb36)|4  
} Mxl]"?z  
=r 9r~SR#  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) KC#/Z2A|<  
{ c{Ou^.yR  
 CDialog::DoDataExchange(pDX); WQ6"0*er  
 //{{AFX_DATA_MAP(CCaptureDlg) ba@ctkCW  
  DDX_Control(pDX, IDC_KEY, m_Key); M{mSd2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); aG%, cQ1  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Ba'LRz  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Fmr}o(q1  
  DDX_Text(pDX, IDC_PATH, m_Path); >V$ Gx>I  
  DDX_Text(pDX, IDC_NUMBER, m_Number); u0Nm.--;_3  
 //}}AFX_DATA_MAP MTOy8 Im  
} U;q];e:,=}  
~1L:_Sg*  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) #oni:]E!m  
//{{AFX_MSG_MAP(CCaptureDlg) ,9D+brm  
 ON_WM_SYSCOMMAND() _iV]_\0W2  
 ON_WM_PAINT() rXfy!rD_P_  
 ON_WM_QUERYDRAGICON() S* *oA 6  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) / JkC+7H4  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) qIMA6u/  
 ON_BN_CLICKED(ID_CHANGE, OnChange) De&6 9  
//}}AFX_MSG_MAP .iD*>M:W  
END_MESSAGE_MAP() 2lVHZ\G  
"Wo,'8{v  
BOOL CCaptureDlg::OnInitDialog() NnT g3:.  
{ i0jBZW"_1$  
 CDialog::OnInitDialog(); C3NdE_E  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); /X'(3'a  
 ASSERT(IDM_ABOUTBOX < 0xF000); VVP:w%yW  
 CMenu* pSysMenu = GetSystemMenu(FALSE); \>QF(J [8  
 if (pSysMenu != NULL) c%m3}mrb  
 { U.!lTLjfLz  
  CString strAboutMenu; !> }.~[M  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ,#?uJTLH  
  if (!strAboutMenu.IsEmpty()) T"7~AbgNU  
  { $(e#aHB  
   pSysMenu->AppendMenu(MF_SEPARATOR); &0zT I?c  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); mZz="ZLa:  
  } E.|-?xQ6  
 } z7GTaX$d  
 SetIcon(m_hIcon, TRUE); // Set big icon I/gjenUK  
 SetIcon(m_hIcon, FALSE); // Set small icon qt%D'  
 m_Key.SetCurSel(0); b` Hz$8  
 RegisterHotkey(); O3DmNq$dz  
 CMenu* pMenu=GetSystemMenu(FALSE); a2Pf/D]n  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,JU@|`  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); G)v #+4  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); L@`ouQ"sa  
 return TRUE; // return TRUE unless you set the focus to a control :0 & X^]\  
} &e-U5'(6v_  
YW u cvw&  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 4lhw3,5  
{ @Z>ZiU,^  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) I$N8tn+E  
 { t58e(dgi  
  CAboutDlg dlgAbout; )9l^O  
  dlgAbout.DoModal(); !l]dR@e  
 } Wjhvxk  
 else `Qr%+OD  
 { <\kr1qH H  
  CDialog::OnSysCommand(nID, lParam); ^j-3av=  
 } EF3Cdu{]P  
} $/!{OU.t`  
H"ZZ.^"5FV  
void CCaptureDlg::OnPaint() ;22oY>w  
{ 7qTE('zt  
 if (IsIconic()) otggN:^Qw  
 { [kE."#  
  CPaintDC dc(this); // device context for painting 7i&:DePM'q  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); {43>m)8+  
  // Center icon in client rectangle <! )**  
  int cxIcon = GetSystemMetrics(SM_CXICON); M%jPH  
  int cyIcon = GetSystemMetrics(SM_CYICON); Y"A/^]  
  CRect rect; UfS%71l.$  
  GetClientRect(&rect); p+)YTzzc  
  int x = (rect.Width() - cxIcon + 1) / 2; 3U_2!zF3_  
  int y = (rect.Height() - cyIcon + 1) / 2; a7N!B'y  
  // Draw the icon 3Zi@A4Wu  
  dc.DrawIcon(x, y, m_hIcon); k'0Pi6  
 } Aq3}Ng  
 else xhcK~5C  
 { (}}S9 K  
  CDialog::OnPaint(); =s<( P1|"  
 } HRB<Y mP@  
} Z+@2"%W  
E Cyyl  
HCURSOR CCaptureDlg::OnQueryDragIcon() U8 nH;}i  
{ +TXX$)3%  
 return (HCURSOR) m_hIcon; KtNY_&xd  
} b0oMs=uBn  
LD!Q8"  
void CCaptureDlg::OnCancel() GvBHd%Ot  
{ 6? w0  
 if(bTray) +SwR+H)?  
  DeleteIcon(); JQ"U4GVp  
  CDialog::OnCancel(); iX)%Q  
} J H7<  
&RfC"lc  
void CCaptureDlg::OnAbout() ocs+d\  
{ 8 @tV9+u  
 CAboutDlg dlg; I'LnI*  
 dlg.DoModal(); X 7rMeu  
} uC cYPvm  
SJHr_bawd  
void CCaptureDlg::OnBrowse() L*:jXmUM_~  
{ Mxv;k%l|E|  
 CString str; N0r16# -g  
 BROWSEINFO bi; kBffF@{  
 char name[MAX_PATH]; EKO[!,  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Y=Kc'x[,Zj  
 bi.hwndOwner=GetSafeHwnd(); M]J ^N#  
 bi.pszDisplayName=name; O&Y*pOg  
 bi.lpszTitle="Select folder"; pej|!oX  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 4T ~}  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 62zYRs\Y)X  
 if(idl==NULL) 9g mW&{6q  
  return; !_Wi!Vr_  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); &wV]"&-  
 str.ReleaseBuffer(); K57&yVX  
 m_Path=str; ;XBI{CW  
 if(str.GetAt(str.GetLength()-1)!='\\') R#I0|;q4|p  
  m_Path+="\\"; r4SXE\ G  
 UpdateData(FALSE); sr{a(4*\  
} 6}!#;@D~  
Eq j_m|@  
void CCaptureDlg::SaveBmp() rogT~G}q  
{ %4gg@Z9  
 CDC dc; ;'cN<x)% |  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); VcXq?f>\  
 CBitmap bm; ()6wvu}  
 int Width=GetSystemMetrics(SM_CXSCREEN); 32`{7a3!=  
 int Height=GetSystemMetrics(SM_CYSCREEN); E4M@WNPx  
 bm.CreateCompatibleBitmap(&dc,Width,Height); xjKR R?  
 CDC tdc; G U( _  
 tdc.CreateCompatibleDC(&dc); `)_dS&_\  
 CBitmap*pOld=tdc.SelectObject(&bm); r2,.abo  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); N(Fp0  
 tdc.SelectObject(pOld); Tu).K.p:  
 BITMAP btm; AHXSt  
 bm.GetBitmap(&btm); LhA/xf  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; v]B3m  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ?j"KV_  
 BITMAPINFOHEADER bih; u=`L )  
 bih.biBitCount=btm.bmBitsPixel; !1$])VQWI  
 bih.biClrImportant=0; 4b98Ks Yg  
 bih.biClrUsed=0; $\X[@E S0  
 bih.biCompression=0; s T}. v*  
 bih.biHeight=btm.bmHeight; 0.8  2kl  
 bih.biPlanes=1; }&w Ur>=  
 bih.biSize=sizeof(BITMAPINFOHEADER); ^c9t'V`IWQ  
 bih.biSizeImage=size; CEX " D`  
 bih.biWidth=btm.bmWidth; t.xxSU5~%  
 bih.biXPelsPerMeter=0; x-^`~ p  
 bih.biYPelsPerMeter=0; u>2 l7PA|  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3h$6t7=C  
 static int filecount=0; < HVl(O  
 CString name; ]~'5\58sP  
 name.Format("pict%04d.bmp",filecount++); (>nGQS]H  
 name=m_Path+name; tMf}   
 BITMAPFILEHEADER bfh; 3=aQG'B  
 bfh.bfReserved1=bfh.bfReserved2=0; Mygf T[_  
 bfh.bfType=((WORD)('M'<< 8)|'B');  W\d{a(*  
 bfh.bfSize=54+size; :bwjJ}F  
 bfh.bfOffBits=54; \hDlTp }  
 CFile bf; 8%A#`)fb  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ '>-gi}z7  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); m qMHL2~  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); A%KDiIA  
  bf.WriteHuge(lpData,size); CDQW !XHc  
  bf.Close(); =8AO:  
  nCount++; K,+LG7ec  
 } n"G&ENN"$  
 GlobalFreePtr(lpData); }`% *W`9b  
 if(nCount==1) bDL,S?@  
  m_Number.Format("%d picture captured.",nCount); Enum/O5  
 else Qz5sxi  
  m_Number.Format("%d pictures captured.",nCount); ZX9TYN  
  UpdateData(FALSE); VVac:  
} 2 ^h27A  
<m)$K  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) D$ dfNiCH  
{ RP[{4 Q8  
 if(pMsg -> message == WM_KEYDOWN) B +\3-q  
 { IzikDc10  
  if(pMsg -> wParam == VK_ESCAPE) )dbB =OZ  
   return TRUE; a{^m-fSaR"  
  if(pMsg -> wParam == VK_RETURN) mF*2#]%dx  
   return TRUE; 0D\#Pq v  
 } }X)&zenz  
 return CDialog::PreTranslateMessage(pMsg); ,':fu  
}  P5a4ze  
xS4w5i2  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8m2Tk\;:  
{ *|%@6I(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ x@P y>f2  
  SaveBmp(); l?Udn0F  
  return FALSE; vK|E>nL  
} 8@i7pBl@  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ xjfV?B'Y}V  
 CMenu pop; :W!7mna  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ]m g)Q:d,  
 CMenu*pMenu=pop.GetSubMenu(0); G&D7a/G\  
 pMenu->SetDefaultItem(ID_EXITICON); +)!YrKuu  
 CPoint pt; YVQN&|-  
 GetCursorPos(&pt); t<#mP@Mz=N  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); JjPKR?[>  
 if(id==ID_EXITICON) IUE~_7  
  DeleteIcon(); j9eTCJqB  
 else if(id==ID_EXIT) *"?l]d  
  OnCancel(); K28+]qy[  
 return FALSE; ALrw\qV  
} }\tdcTMgS  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +T|JK7  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) [ey:e6,T9  
 AddIcon(); |'P]GK  
 return res; `Nz/O h7  
} h`KFL/fT  
Wk~W Ozr}^  
void CCaptureDlg::AddIcon() |n+qMql'  
{ sy:[T T!w  
 NOTIFYICONDATA data; LJd5;so-  
 data.cbSize=sizeof(NOTIFYICONDATA); D>/0v8  
 CString tip; LLk(l#K*  
 tip.LoadString(IDS_ICONTIP); = s>T;|  
 data.hIcon=GetIcon(0); Vq2y4D?  
 data.hWnd=GetSafeHwnd(); .a O,8M  
 strcpy(data.szTip,tip); ]op}y0  
 data.uCallbackMessage=IDM_SHELL; t[ubn+  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; =5J7Hw&K  
 data.uID=98; e<3K;Q  
 Shell_NotifyIcon(NIM_ADD,&data);  aC$B2  
 ShowWindow(SW_HIDE); aZ2!i  
 bTray=TRUE; RN$1bxY  
} /1"(cQ%?  
{G U&a  
void CCaptureDlg::DeleteIcon() |jI#"LbF  
{ 3LAIl913  
 NOTIFYICONDATA data; mw_~*Nc'9  
 data.cbSize=sizeof(NOTIFYICONDATA); 5's87Z;6  
 data.hWnd=GetSafeHwnd(); $bW3_rl%X  
 data.uID=98; Eo{"9j\  
 Shell_NotifyIcon(NIM_DELETE,&data); VCY\be  
 ShowWindow(SW_SHOW); 13=A  
 SetForegroundWindow(); [$qyF|/K`n  
 ShowWindow(SW_SHOWNORMAL); v25R_""~  
 bTray=FALSE; 4" Cb/y3  
} "S8uoSF`>  
vMA]j>>  
void CCaptureDlg::OnChange() wN@oYFoL  
{ 2/vMoVT,  
 RegisterHotkey(); -=%@L&y1  
} JLnH&(O  
M9!HQ   
BOOL CCaptureDlg::RegisterHotkey() I;e=0!9U  
{ \n$u)Xj~6^  
 UpdateData(); h]Wr [v  
 UCHAR mask=0; 4lr(,nPRD  
 UCHAR key=0; n"c)m%yZ  
 if(m_bControl) S)cLW~=z  
  mask|=4; I9/W;# *~  
 if(m_bAlt) ?{/4b:ua  
  mask|=2; 6VS4y-N  
 if(m_bShift) =y [M\m  
  mask|=1; "U e. @>  
  key=Key_Table[m_Key.GetCurSel()]; K~AR*1??[  
 if(bRegistered){ s %qF/70'  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); tX5"UQA  
  bRegistered=FALSE; g l^<Q  
 } gW^VVbB'L  
 cMask=mask; Yk)."r&?  
 cKey=key; k_sg ?(-!o  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); KV]X@7`@  
 return bRegistered; V}J)\VZ2#  
} q)Lu_6 mg  
q"%_tS  
  四、小结 5>CEl2mSl  
zDw5]*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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