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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: USV;j%U4*  
  &XB1=b5  
  一、实现方法 {CQI*\O  
3^]Kd  
  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: smPZ%P}P+c  
R:U!HE8j   
#pragma data_seg("shareddata") K Vnz{cx`  
HHOOK hHook =NULL; //钩子句柄 -;o0) DwZ  
UINT nHookCount =0; //挂接的程序数目 -932[+  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ;eC8| Xz  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ,EH^3ODD  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey CJt(c,!z  
static int KeyCount =0; QLb!e"C  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 95*=& d  
#pragma data_seg() t]+h.  
vlPViHF.  
  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。 UxvT|~"  
=W"9a\m  
  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: cD9.L  
qjH/E6GGg  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR  ?S'Wd=  
cKey,UCHAR cMask) \;0UP+  
{ }T"&4Rvs2R  
 BOOL bAdded=FALSE; 2[1lwV  
 for(int index=0;index<MAX_KEY;index++){ 35Fs/Gf-n  
  if(hCallWnd[index]==0){ 89ab?H}/  
   hCallWnd[index]=hWnd; G3gEL)b*  
   HotKey[index]=cKey; wcL|{rUXba  
   HotKeyMask[index]=cMask; n8o(>?Kw  
   bAdded=TRUE; _@O.EksY3r  
   KeyCount++; @UW*o&pGqL  
   break; 4d%QJ7y  
  } @|fT%Rwho<  
 } c Sktm&SP  
 return bAdded; 5 &s<&h  
} *_eY +\j  
//删除热键 [N0"mE<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (4IH%Ez){  
{ )odz/\9n3c  
 BOOL bRemoved=FALSE; |\N))K-2D  
 for(int index=0;index<MAX_KEY;index++){ du&9mOrr  
  if(hCallWnd[index]==hWnd){ 6,(S}x YDZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ lGX8kAv?  
    hCallWnd[index]=NULL; K*N8Vpz(  
    HotKey[index]=0; 838@jip  
    HotKeyMask[index]=0; 3PEW0b*]Pf  
    bRemoved=TRUE; $`_xP1bUT  
    KeyCount--; vO8CT-)  
    break; iM~qSRb#mJ  
   } O[R   
  } }M &hcw<  
 } g4GU28l  
 return bRemoved; uk)D2.eS,  
} Rzxkz  
] jycg@=B  
vzZ"TSP  
  DLL中的钩子函数如下: 6IKi*}  
=6[R,{|C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]GXE2A_i;  
{ | ?ma?  
 BOOL bProcessed=FALSE; K&;/hdS=F  
 if(HC_ACTION==nCode) V(OD^GU  
 { s;xErH@RA  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ^o Q^/v~  
   switch(wParam) RT"JAJTi/  
   {  '|nAGkA  
    case VK_MENU: K4^mG  
     MaskBits&=~ALTBIT;  8s>OO&  
     break; fi'\{!!3m^  
    case VK_CONTROL: %RXFgm!{f  
     MaskBits&=~CTRLBIT; 2Y%E.){  
     break; J pKCux  
    case VK_SHIFT: 3.@ir"vy  
     MaskBits&=~SHIFTBIT; j\2q2_f  
     break; D>K=D"  
    default: //judge the key and send message K<fB]44Y  
     break; 'V} 4_3#q  
   } tFX!s;N[  
   for(int index=0;index<MAX_KEY;index++){ WP4 "$W  
    if(hCallWnd[index]==NULL) X,`e1nsR  
     continue; O:+?:aI@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wg|/-q-  
    { WR}<^a x  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); sF1j4 NC  
     bProcessed=TRUE; 4?l:.\fB:  
    } XvkFP'%i/  
   } c)zwyBz  
  } Z)G@ahO Q  
  else if((lParam&0xc000ffff)==1){ //有键按下 77;|PKE /  
   switch(wParam) E 7"`D\*  
   { MzIn~[\  
    case VK_MENU: :tX,`G  
     MaskBits|=ALTBIT; {\ J%i|u  
     break; Ui }%T]  
    case VK_CONTROL: R9InUX"k  
     MaskBits|=CTRLBIT; U Kf0cU  
     break; .<.#g +  
    case VK_SHIFT: 7DIFJJE'  
     MaskBits|=SHIFTBIT; =xM:8 hm  
     break; vp`s< ;CA  
    default: //judge the key and send message hmJa1fw=  
     break; }M~[8f ]  
   } D@yu2}F{IY  
   for(int index=0;index<MAX_KEY;index++){ !k8j8v&  
    if(hCallWnd[index]==NULL) )%~<EJ*&Z  
     continue; u-HBmL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U$j?2|v-x  
    { jU=n\o=?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); aaFt=7(K  
     bProcessed=TRUE; "ac$S9@~  
    } @fI 2ZWN|  
   } QP!0I01  
  } >npFg@A  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 '))=y@M  
   for(int index=0;index<MAX_KEY;index++){ zN,2 (v"  
    if(hCallWnd[index]==NULL) ~A-D>.ZH  
     continue; fnn /akGKI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;g_<i_ *x#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \Wf1b8FW  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ![{0Yw D  
   } S"Drg m.  
  } Io7o*::6iw  
 } iU?xw@W R  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  Yk yB  
} VU \{<j{  
Vi<F@ji  
  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: 7kh(WtUz  
D' oy% 1Q}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ZG Qz@H5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); L] !M1\  
"$PX [:  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: @JpkG%eK  
!s(s^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \Culf'iX  
{ JG=z~STz  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) {[[/*1r|  
 { zfm#yDf  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 &``nYI g/  
  SaveBmp(); utBKl' `  
  return FALSE; @;h$!w<  
 } (z IIC"~5  
 …… //其它处理及默认处理 `8G {-_  
} z-?WU  
K1m'20U  
TV*@h2C"i  
  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。 cUc:^wvLS  
QZamf lk  
  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。 .?*TU~S  
s?_H<u  
  二、编程步骤 Z,5B(Xj  
Jn)DZv8?  
  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"; 6G]hs gro  
c^`(5}39v  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Pze{5!  
`E-cf7%  
  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; R6-Z]H u  
_/cL"Wf  
  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; {}N=pL8MS  
n_@cjO  
  5、 添加代码,编译运行程序。 _A,mY6 *  
{qL}:ha?  
三、程序代码 b0 y*}  
Gc{s?rB_  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL !Yu|au  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) !MQVtn^C#  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ @V qI+5TA  
#if _MSC_VER > 1000 #qg(DgH 7  
#pragma once 29r(Y  
#endif // _MSC_VER > 1000 zoHFTD4 g  
#ifndef __AFXWIN_H__ v7G&`4~  
#error include 'stdafx.h' before including this file for PCH [?nM)4d  
#endif ~<q^4w.=7C  
#include "resource.h" // main symbols w}r~Wk^dLI  
class CHookApp : public CWinApp S F&EVRv  
{ 0:q R,NW^#  
 public: N_| '`]D  
  CHookApp(); T9&bY>f?  
  // Overrides ]]8^j='P'  
  // ClassWizard generated virtual function overrides W^N|+$g>H  
  //{{AFX_VIRTUAL(CHookApp) j xTYW)E   
 public: {q|Om?@  
  virtual BOOL InitInstance(); J:oAzBFpA  
  virtual int ExitInstance(); EN{o3@ O'  
  //}}AFX_VIRTUAL lq }g*ih  
  //{{AFX_MSG(CHookApp) M*7:-Tb]C  
  // NOTE - the ClassWizard will add and remove member functions here. HAc1w]{(  
  // DO NOT EDIT what you see in these blocks of generated code ! Bd>a"3fA  
  //}}AFX_MSG p5JRG2zt  
  DECLARE_MESSAGE_MAP() od RtJ[   
}; =Bw2{]w  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); zt/N)5\V  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8N9X1Mb|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <U~at+M  
BOOL InitHotkey(); ?"L ^ 0%  
BOOL UnInit(); `F4gal^ ^  
#endif n5;>e&  
Rxk0^d:sNi  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ,@0D_&JAl  
#include "stdafx.h" D%!GY1wdn  
#include "hook.h" vnD `+y  
#include <windowsx.h> sG8G}f  
#ifdef _DEBUG 0*XCAnJ^_  
#define new DEBUG_NEW <zt124y-6  
#undef THIS_FILE $#/f+kble  
static char THIS_FILE[] = __FILE__; `$i/f(t6`  
#endif XWv;l)  
#define MAX_KEY 100 #MAXH7[  
#define CTRLBIT 0x04 5Sz}gP('  
#define ALTBIT 0x02  95l)w  
#define SHIFTBIT 0x01 gt)wk93d>  
#pragma data_seg("shareddata") ^b^}6L'Z  
HHOOK hHook =NULL; ]1&} L^a  
UINT nHookCount =0; 9N V.<&~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey p d(W(-`8!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT oxXCf%!  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey R(on[g_1  
static int KeyCount =0; (qdvvu#E  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift /nB|Fo_&Q  
#pragma data_seg() f_'8l2jK1i  
HINSTANCE hins; e]-%P(}Z  
void VerifyWindow(); }0idFotck  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) qA5 Ug  
//{{AFX_MSG_MAP(CHookApp) ndS8p]P&o(  
// NOTE - the ClassWizard will add and remove mapping macros here. Js/QL=,  
// DO NOT EDIT what you see in these blocks of generated code! #dDM "s  
//}}AFX_MSG_MAP njckPpyb@  
END_MESSAGE_MAP() ED^0t  
OU'm0Jlk  
CHookApp::CHookApp() 5[Uv%A?H#_  
{ \h5!u1{L  
 // TODO: add construction code here, Sjo7NR^#e  
 // Place all significant initialization in InitInstance 5&TH\2u  
} {fa3"k_ke  
P$5K[Y4f  
CHookApp theApp; VMH^jCFp  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 20cEE>  
{ .JX9(#Uk  
 BOOL bProcessed=FALSE; D hD^w;f]  
 if(HC_ACTION==nCode) D";@)\jN  
 { ^]MLEr!S  
  if((lParam&0xc0000000)==0xc0000000){// Key up ~DP_1V?  
   switch(wParam) ZY=a[K  
   { fs0EbVDF  
    case VK_MENU: vX|5*T`(  
     MaskBits&=~ALTBIT; ZaF9Q%  
     break; U X%J?;g  
    case VK_CONTROL: _BZ6Ws$C2  
     MaskBits&=~CTRLBIT; 8\Bb7*  
     break; IR|#]en  
    case VK_SHIFT: vKBi jmE  
     MaskBits&=~SHIFTBIT; 3<HZ)w^B  
     break; 4d\V=_);r  
    default: //judge the key and send message Ui.S)\B  
     break; DB3qf>@?  
   } nM|F MK^  
   for(int index=0;index<MAX_KEY;index++){ Vh N6 oI  
    if(hCallWnd[index]==NULL) EO%"[k  
     continue; '9!J' [W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J?C:@Q  
    { Vrs?VA`v$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); qyP={E9A  
     bProcessed=TRUE; ZlP+t>  
    } MI)v@_1d  
   } LB`{35b-  
  } oL@K{dk  
  else if((lParam&0xc000ffff)==1){ //Key down (dTQ,0  
   switch(wParam) oI-,6G}  
   {  zPN:)  
    case VK_MENU: wKKQAM6P1  
     MaskBits|=ALTBIT; %`*On~  
     break; JJK-+a6cX  
    case VK_CONTROL: )+|Y;zC9  
     MaskBits|=CTRLBIT; 6ZfL-E{  
     break; )Z)Gb~G  
    case VK_SHIFT: " =6kH,  
     MaskBits|=SHIFTBIT; 8Qhj_  
     break; Xw3j(`w$,  
    default: //judge the key and send message a |#TnSk  
     break; 9{ #5~WP  
   } N&^zXY  
   for(int index=0;index<MAX_KEY;index++) &x7iEbRs  
   { ~;#sj&~  
    if(hCallWnd[index]==NULL) :Iuc H%6V  
     continue; OY8P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3g3f87[  
    { W/g_XQ   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); M.+h3<%^  
     bProcessed=TRUE; V-eRGSx  
    } W4UK?#S+  
   } {@6:kkd  
  } sNM ]bei  
  if(!bProcessed){ ~d\^ynQ  
   for(int index=0;index<MAX_KEY;index++){ No`*->R  
    if(hCallWnd[index]==NULL) nW}jTBu_K+  
     continue; FzNj':D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) n'0r (  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .f"1(J8  
   } [S1 b\f#  
  } \*[DR R0  
 } vn!5@""T  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); hQ'W7EF  
} YmOj.Q&  
ea]qX6)UZ  
BOOL InitHotkey() %z=:P{0UQ  
{ ja9=b?]0,  
 if(hHook!=NULL){ Wf^ sl  
  nHookCount++; ?U+hse3e~  
  return TRUE; 2vh }:A_  
 } r)#W`A1{A  
 else @<`V q  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Lq;T\m_de  
  if(hHook!=NULL) iD*Hh-  
   nHookCount++; AUu<@4R7  
  return (hHook!=NULL); n}t 9Nf_  
} b $yIM  
BOOL UnInit() 8d_J9Ho  
{ e^oGiL ~  
 if(nHookCount>1){ ="v`W'Pd  
  nHookCount--; <bb!BS&w  
  return TRUE; {Wi*B(  
 } M[~{!0Uz g  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Y[]I!Bc  
 if(unhooked==TRUE){ :)i,K>y3i  
  nHookCount=0; } C:i0Q  
  hHook=NULL; `hdff0  
 } 1YQYZ^11  
 return unhooked; AwjXY,2  
} ZuybjV1/f6  
[N Afy~X*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) kJpO0k9?eY  
{ TY'c'u,  
 BOOL bAdded=FALSE; [T,Hpt  
 for(int index=0;index<MAX_KEY;index++){ 2x9.>nwhb  
  if(hCallWnd[index]==0){ W=3#oX.GsU  
   hCallWnd[index]=hWnd; #4./>}G  
   HotKey[index]=cKey; , ^K.J29  
   HotKeyMask[index]=cMask; c?e-2Dp(  
   bAdded=TRUE; YoW)]n  
   KeyCount++; ~ \<$H'  
   break; g(W+[kj)  
  } yQMwt|C4  
 } 9TQVgkW  
 return bAdded; |9=A"092{  
} &+&@;2  
Z|Oq7wzEH  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T - _))  
{ _dRB=bl"O  
 BOOL bRemoved=FALSE; b>VV/j4!/  
 for(int index=0;index<MAX_KEY;index++){ ]J'TebP=L5  
  if(hCallWnd[index]==hWnd){ =Y81h-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4>i\r  
    hCallWnd[index]=NULL; =\|,hg)c  
    HotKey[index]=0; HE-5e): k  
    HotKeyMask[index]=0; Ak,JPz T  
    bRemoved=TRUE; a#"orc j  
    KeyCount--; '~Cn+xf4]  
    break; )v_v 7 ~H&  
   } |=*)a2  
  } }x\#ul)  
 } )~)l^0X  
 return bRemoved; NIVR;gm  
} RrvC}9ar  
VC/-5'_6  
void VerifyWindow() n0T|U  
{ |(Mxbprz  
 for(int i=0;i<MAX_KEY;i++){ "WuUMt  
  if(hCallWnd!=NULL){ :MY=Q]l  
   if(!IsWindow(hCallWnd)){ \Q(a`6U  
    hCallWnd=NULL; Lv]%P.=[G  
    HotKey=0; "A"YgD#t  
    HotKeyMask=0; Qy0w'L/@  
    KeyCount--; bf0,3~G,P  
   } o+&Om~W  
  } JR#4{P@A  
 } j :B/ FL  
} uR :EH.K  
On}1&!{1]  
BOOL CHookApp::InitInstance() /uX*FZ  
{ D$ K'Qk  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); #p@GhI!6  
 hins=AfxGetInstanceHandle(); '"E!av>  
 InitHotkey(); !e$ZOYe  
 return CWinApp::InitInstance(); CTW\Dt5  
} X':FFD4h  
H" `'d  
int CHookApp::ExitInstance() G~8BND[."  
{ TT/H"Ri}Jp  
 VerifyWindow(); tngB;9c+w  
 UnInit(); n}.e(z_"  
 return CWinApp::ExitInstance(); Hs'~) T  
} Z8ea)_ {#  
G|f9l?p  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file cVW7I  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) zplv.cf#q  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ RB+Jp  
#if _MSC_VER > 1000 Hvm}@3F|  
#pragma once h;jO7+W  
#endif // _MSC_VER > 1000 3 R+e  
s{Qae=$Q  
class CCaptureDlg : public CDialog h8asj0  
{ @6yc^DAA  
 // Construction zp;!HP;/=  
 public: ]"Uzn  
  BOOL bTray; 7/IL" D  
  BOOL bRegistered;  RbTGAA  
  BOOL RegisterHotkey(); GNMOHqg4  
  UCHAR cKey; NUYKMo1ze  
  UCHAR cMask; o13jd NQ-  
  void DeleteIcon(); +Pb:<WT}%  
  void AddIcon(); q7Hf7^a  
  UINT nCount; bPxL+ +  
  void SaveBmp(); sQ#e 2  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor hz4?ku  
  // Dialog Data s6 g"uF>k  
  //{{AFX_DATA(CCaptureDlg) 9)1Ye  
  enum { IDD = IDD_CAPTURE_DIALOG }; j+gxn_E  
  CComboBox m_Key; =|z:wlOs  
  BOOL m_bControl; ; zJb("n  
  BOOL m_bAlt; hU""YP ~y  
  BOOL m_bShift; 9KU&M"Yq&i  
  CString m_Path; /ovVS6Ai  
  CString m_Number; d-_V*rYU  
  //}}AFX_DATA 4n1g4c-   
  // ClassWizard generated virtual function overrides _M`ZF*o=c  
  //{{AFX_VIRTUAL(CCaptureDlg) :,0(aB  
 public: ~r.R|f]IQ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); dR]-R/1|  
 protected: TM(y%!\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Njg$~30  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); BS##nS-[  
  //}}AFX_VIRTUAL Dm}eX:'{  
  // Implementation ^<OYW|q?\r  
 protected: \~hrS/$[$  
  HICON m_hIcon; PK2;Ywk`  
  // Generated message map functions {oqbV#/&  
  //{{AFX_MSG(CCaptureDlg) %42a>piev  
  virtual BOOL OnInitDialog(); %LMpErZO  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); +Umsr  
  afx_msg void OnPaint(); R|C`  
  afx_msg HCURSOR OnQueryDragIcon(); `HRL .uX  
  virtual void OnCancel(); e%JIqKS  
  afx_msg void OnAbout(); BI`)P+K2  
  afx_msg void OnBrowse(); 58s-RO6  
  afx_msg void OnChange(); M4C8K{}  
 //}}AFX_MSG Z&n[6aV'F  
 DECLARE_MESSAGE_MAP() D!o[Sm}JO[  
}; TF/NA\0c$  
#endif }pMVl  
$z%(He  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file {1Ra |,;  
#include "stdafx.h" [LnPV2@e  
#include "Capture.h" \l:R]:w;ZI  
#include "CaptureDlg.h" WVa%<  
#include <windowsx.h> Zt!#KSF7%  
#pragma comment(lib,"hook.lib") YbP @  
#ifdef _DEBUG Rs<q^w]  
#define new DEBUG_NEW Qfn:5B]tI  
#undef THIS_FILE #<*.{"T  
static char THIS_FILE[] = __FILE__; s?EQ  
#endif -O *_+8f  
#define IDM_SHELL WM_USER+1 6j|Ncv  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 05LkLB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); n= <c_a)Nb  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; K<J,n!zc  
class CAboutDlg : public CDialog U80=f2  
{ ,j*9)  
 public: i=Qy?aU?  
  CAboutDlg(); '8;bc@cE  
  // Dialog Data xvOz*vM?  
  //{{AFX_DATA(CAboutDlg) r W`7<3  
  enum { IDD = IDD_ABOUTBOX }; nEsD+ }E?  
  //}}AFX_DATA i&:SWH=  
  // ClassWizard generated virtual function overrides x []ad"R  
  //{{AFX_VIRTUAL(CAboutDlg) @ 8H$   
 protected: |c/=9Bb  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support z{W C w  
  //}}AFX_VIRTUAL q2EDrZ  
  // Implementation F=Bdgg9s  
 protected: @Y/&qpo$#W  
  //{{AFX_MSG(CAboutDlg) 2#.s{Bv  
  //}}AFX_MSG /yG7!k]Eg  
  DECLARE_MESSAGE_MAP() 12Oa_6<\0;  
}; m%[e_eS  
1cK'B<5">]  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) XH?//.q  
{ unFRfec{  
 //{{AFX_DATA_INIT(CAboutDlg) ircF3P>a?  
 //}}AFX_DATA_INIT s:tX3X  
} X9Ch(nWX  
6MVu"0#  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) w#b@6d  
{ #'Y lO -C  
 CDialog::DoDataExchange(pDX); OE@[a  
 //{{AFX_DATA_MAP(CAboutDlg) ^K<3_D>1>  
 //}}AFX_DATA_MAP h <4`|Bg+  
} %nZ:)J>kz  
# sw4)*v  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) v.(dOIrX  
 //{{AFX_MSG_MAP(CAboutDlg) sE[`x^1'8  
 // No message handlers n2K1X!E$  
 //}}AFX_MSG_MAP CV @P +  
END_MESSAGE_MAP() |}4\Gm  
f}bq  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) r84^/+"T  
: CDialog(CCaptureDlg::IDD, pParent) D}?p>e|<D  
{ 60~;UBm5O  
 //{{AFX_DATA_INIT(CCaptureDlg) wtYgHC}X  
  m_bControl = FALSE; Cy[G7A%  
  m_bAlt = FALSE; $P{`-Y }a  
  m_bShift = FALSE; "-=fi 'D  
  m_Path = _T("c:\\"); }:2##<"\t  
  m_Number = _T("0 picture captured."); ^m#tWb)f  
  nCount=0; 2Xe1qzvo  
  bRegistered=FALSE; i#la'ICwJ  
  bTray=FALSE; -P}A26qB  
 //}}AFX_DATA_INIT VL*KBJ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 H{Ewj_L  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); X)KCk2Ax  
} 6k t,q0  
zFjz%:0  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) .P 1WY  
{ Yj@ Sy  
 CDialog::DoDataExchange(pDX); Xfk DMh  
 //{{AFX_DATA_MAP(CCaptureDlg) T`E0_ZU;  
  DDX_Control(pDX, IDC_KEY, m_Key); ,m{R m0  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); i% 1UUI(W  
  DDX_Check(pDX, IDC_ALT, m_bAlt); {32m&a  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); !5} }mf  
  DDX_Text(pDX, IDC_PATH, m_Path); M{L- V  
  DDX_Text(pDX, IDC_NUMBER, m_Number); s`$}xukT  
 //}}AFX_DATA_MAP &3t973=  
} +VkL?J  
#Nh'1@@  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) b$b;^nly  
//{{AFX_MSG_MAP(CCaptureDlg) +0&^.N  
 ON_WM_SYSCOMMAND() UQu6JkbLL  
 ON_WM_PAINT() 86=W}eV1r  
 ON_WM_QUERYDRAGICON() $9X+dvu*  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) _^& q,S  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) t$$YiO  
 ON_BN_CLICKED(ID_CHANGE, OnChange) bny5e:= d  
//}}AFX_MSG_MAP *\XOQWrF  
END_MESSAGE_MAP() I;w!  
B $g\;$G  
BOOL CCaptureDlg::OnInitDialog() @S@VsgQ%3Z  
{ h r];!.Fv  
 CDialog::OnInitDialog(); "OenYiz  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); F1.Xk1y%  
 ASSERT(IDM_ABOUTBOX < 0xF000); \ivxi<SR  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 'V?FeWp  
 if (pSysMenu != NULL) 9qftMDLZJ\  
 { F%6wdM W  
  CString strAboutMenu; DC h !Z{I  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 6bPxEILm  
  if (!strAboutMenu.IsEmpty()) UDJjw  
  { ;O}%SCF7  
   pSysMenu->AppendMenu(MF_SEPARATOR); .aT@'a{F  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); I,hw0e  
  } :6Nb,Hh~  
 } 1%v6d !  
 SetIcon(m_hIcon, TRUE); // Set big icon |<u+Xi ~  
 SetIcon(m_hIcon, FALSE); // Set small icon cANt7  
 m_Key.SetCurSel(0); cTq@"v di  
 RegisterHotkey(); or*{P=m+R  
 CMenu* pMenu=GetSystemMenu(FALSE); gHPJiiCv  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); @mCe{r*`  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); MSmr7%g3D  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); .zgh,#=  
 return TRUE; // return TRUE unless you set the focus to a control )7 Mss/2T  
} HS <Jp44  
)Jjp^U3Ub  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ?SNacN@r  
{ 8H4NNj Oy  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) _[R(9KyF0f  
 { n0lOq  
  CAboutDlg dlgAbout; q5_zsUR=  
  dlgAbout.DoModal(); +KbkdY Z  
 } -W9DH^EL<  
 else X\m\yv}}  
 { n}UJ - \$  
  CDialog::OnSysCommand(nID, lParam); 'd~(=6J  
 } Q2 !GWz$  
} EsKgS\`RZ  
C>Hdp_Lm  
void CCaptureDlg::OnPaint() NVx>^5QV  
{ WOn<;'}M&  
 if (IsIconic()) b#?sx"z  
 { )8C`EPe  
  CPaintDC dc(this); // device context for painting DP),~8  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?XY'<]o E  
  // Center icon in client rectangle KdkL_GSLT  
  int cxIcon = GetSystemMetrics(SM_CXICON); U3N d\b'0  
  int cyIcon = GetSystemMetrics(SM_CYICON); 7<)H?;~;  
  CRect rect; )xy>:2!#Y  
  GetClientRect(&rect); 2 H%lN`  
  int x = (rect.Width() - cxIcon + 1) / 2; ,y]-z8J  
  int y = (rect.Height() - cyIcon + 1) / 2; v)Y)tu>  
  // Draw the icon K@7%i|H  
  dc.DrawIcon(x, y, m_hIcon); )zxb]Pg+  
 } {Phq39g  
 else O8 .iP+  
 { le \f:  
  CDialog::OnPaint(); /''=V.-N  
 } f!kZyD7  
} uZL]mwkj]  
4m< ]qw  
HCURSOR CCaptureDlg::OnQueryDragIcon()  skl3/!  
{ vSHPN|*  
 return (HCURSOR) m_hIcon; d3q%[[@  
} xmnBG4,f  
F:m6Mf7L  
void CCaptureDlg::OnCancel() D=^&?@k<  
{ *1EmK.-'u  
 if(bTray) _$R=F/88  
  DeleteIcon(); i975)_X(  
  CDialog::OnCancel(); y!1X3X,V  
} Jpduk&u  
b3%x&H<j  
void CCaptureDlg::OnAbout() / ]8e[t>!f  
{ 3g4=as4w  
 CAboutDlg dlg;  b+a+OI D  
 dlg.DoModal(); XnP?hw%  
} >s5}pkAv|e  
z" tz-~  
void CCaptureDlg::OnBrowse() YA pC|R,^  
{ m+XHFU  
 CString str; #8h7C8]&  
 BROWSEINFO bi; DyqqY$ vH(  
 char name[MAX_PATH]; -]^JaQw  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ; +\h$  
 bi.hwndOwner=GetSafeHwnd(); Y#c439&  
 bi.pszDisplayName=name; MtL<)?HQ  
 bi.lpszTitle="Select folder"; %j^QK>%  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @K!JE w\  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); pG"wQ  
 if(idl==NULL) nT> v  
  return; l1T`[2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Y0g]-B  
 str.ReleaseBuffer(); oIO@#   
 m_Path=str; _OG9wi(Fpx  
 if(str.GetAt(str.GetLength()-1)!='\\') aUNA` L  
  m_Path+="\\"; ZY,$oFdsi  
 UpdateData(FALSE); ?Ojv<L-f.:  
} /lR*ab  
8a*&,W  
void CCaptureDlg::SaveBmp() 1av#u:jy~>  
{ JL4E`  
 CDC dc; C:No ^nH>  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); zV}:~;w  
 CBitmap bm; .I~:j`K6  
 int Width=GetSystemMetrics(SM_CXSCREEN); WA2NjxYz  
 int Height=GetSystemMetrics(SM_CYSCREEN); lt-3OcC  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 9^DAlY,x.  
 CDC tdc; 1Z ~C3)T=  
 tdc.CreateCompatibleDC(&dc); ?jz\[0)s  
 CBitmap*pOld=tdc.SelectObject(&bm); EHq; eF  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Q   
 tdc.SelectObject(pOld); p^ (Z  
 BITMAP btm; LT$t%V0?.e  
 bm.GetBitmap(&btm); +JYb)rn$^  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; sxr,] @  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); lF64g  
 BITMAPINFOHEADER bih; eV!(a8  
 bih.biBitCount=btm.bmBitsPixel; w-JWMgY8w  
 bih.biClrImportant=0; Khd A;bF  
 bih.biClrUsed=0; +w[ZMk  
 bih.biCompression=0; h._eP.W`  
 bih.biHeight=btm.bmHeight; W#!AZ!  
 bih.biPlanes=1; WYF8?1dt +  
 bih.biSize=sizeof(BITMAPINFOHEADER); FR6 W-L  
 bih.biSizeImage=size; ;+ C$EJw-  
 bih.biWidth=btm.bmWidth; GXm#\)  
 bih.biXPelsPerMeter=0; >"IG\//I  
 bih.biYPelsPerMeter=0; ym5@SBqIx  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); -3yK>\y=|  
 static int filecount=0; 5ph CEKt;  
 CString name; rZwSo]gp  
 name.Format("pict%04d.bmp",filecount++); (z8ZCyq7r[  
 name=m_Path+name; vcj(=\ e8v  
 BITMAPFILEHEADER bfh; ! (lF#MG}  
 bfh.bfReserved1=bfh.bfReserved2=0; 41=H&G&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); %r.OV_04  
 bfh.bfSize=54+size; &I=o1F2B)  
 bfh.bfOffBits=54; o]tfvGvU*  
 CFile bf; ,{G\-(\  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ R\ 8[6H  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ##''d||u  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ZRYlm$C  
  bf.WriteHuge(lpData,size); YGPb8!  
  bf.Close(); :vIJ>6lIR  
  nCount++; xO:h[  
 } ?8kFAf~  
 GlobalFreePtr(lpData); 4u*n7di$9d  
 if(nCount==1) 4tUoK[p  
  m_Number.Format("%d picture captured.",nCount); ::{\O\w  
 else z59;Qk  
  m_Number.Format("%d pictures captured.",nCount); JtY$AP$  
  UpdateData(FALSE); o|d:rp!^  
} 9mk@\Gqqm  
93D}0kp  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) zd2_k 9  
{ 0kCo0{+n  
 if(pMsg -> message == WM_KEYDOWN) c;/vzIJj  
 { 4Ia'Yr  
  if(pMsg -> wParam == VK_ESCAPE) ,<+:xl   
   return TRUE; DjaXJ?'  
  if(pMsg -> wParam == VK_RETURN) Y?1T XsvF  
   return TRUE; clyp0`,7  
 } Y(`Bc8h  
 return CDialog::PreTranslateMessage(pMsg); Zs t)S(  
} l'[;q '  
cQLPgE0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~pp< T  
{ H0tu3Pqk  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ a ub$4n!C9  
  SaveBmp(); 1P*GIt2L  
  return FALSE; 4 y}z+4  
} =Bc{0p*  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ LiFR7\z  
 CMenu pop; ea @ H  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 7;@YR  
 CMenu*pMenu=pop.GetSubMenu(0); tk -)N+M.  
 pMenu->SetDefaultItem(ID_EXITICON); GIYdI#0RC  
 CPoint pt; !wE% <Fh  
 GetCursorPos(&pt); >pZ _  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %"c;kvw  
 if(id==ID_EXITICON) L'$\[~Ug  
  DeleteIcon(); jTqJ(M}L  
 else if(id==ID_EXIT) `K0.6i [p  
  OnCancel(); ]U~{?K'g@j  
 return FALSE; VJ'-"8tY&  
} Ux?G:LLz  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ueU"v'h\  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) c99|+i50  
 AddIcon(); c)Ef]E\  
 return res; _}j>  
} =>>Dnp  
f#AuZ]h  
void CCaptureDlg::AddIcon() :T PG~`k(  
{ SF:{PgGMi  
 NOTIFYICONDATA data; 2=fLb7  
 data.cbSize=sizeof(NOTIFYICONDATA); 7}\AhQ, S  
 CString tip; [-#1;!k  
 tip.LoadString(IDS_ICONTIP); OY|9V  
 data.hIcon=GetIcon(0); )40YA\V  
 data.hWnd=GetSafeHwnd(); YH%U$eS#g  
 strcpy(data.szTip,tip); 9`/ywt3Y  
 data.uCallbackMessage=IDM_SHELL; ;7E"@b,tPN  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; G,Yctv  
 data.uID=98; MW^FY4V1m  
 Shell_NotifyIcon(NIM_ADD,&data); QHje}  
 ShowWindow(SW_HIDE); . P 44t  
 bTray=TRUE; s$9ow<oi]  
} MwD+'5   
&{WEtaXaa  
void CCaptureDlg::DeleteIcon() 7 v3%dCvf  
{ aB G*  
 NOTIFYICONDATA data; z,C>Rh9Id  
 data.cbSize=sizeof(NOTIFYICONDATA); M{u7Ef  
 data.hWnd=GetSafeHwnd();  `m_f i  
 data.uID=98; |1!|SarM{B  
 Shell_NotifyIcon(NIM_DELETE,&data); ;CL^2{  
 ShowWindow(SW_SHOW); {hO|{vz  
 SetForegroundWindow(); Y8s-cc(  
 ShowWindow(SW_SHOWNORMAL); : +^`VLIf  
 bTray=FALSE; N8r+Q%ov  
} `.VkR5/  
PMQ31f/zf  
void CCaptureDlg::OnChange() c}=[r1M*  
{ xXV15%&  
 RegisterHotkey(); Z^A(Q>{e  
} U!"RfRD.<  
r!>=G%  
BOOL CCaptureDlg::RegisterHotkey() >i1wB!gc8  
{ *"/BD=INv}  
 UpdateData(); 8BS$6Pa  
 UCHAR mask=0; `i!-@WN"  
 UCHAR key=0; J{EK}'  
 if(m_bControl) iu+H+_  
  mask|=4; ONcS,oHW  
 if(m_bAlt) -Vg0J6x  
  mask|=2; UU =,Brb  
 if(m_bShift) =>TXo@rVN  
  mask|=1; sh<JB`^$(?  
  key=Key_Table[m_Key.GetCurSel()]; 8p~[8}  
 if(bRegistered){ |])Ko08*tE  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 7V\M)r{q7  
  bRegistered=FALSE; r_a1oO:  
 } #eI` l`}  
 cMask=mask; +(q r{G?  
 cKey=key; ,qgR+]?({  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 7BA9zs392  
 return bRegistered; aJNsJIY+  
} ).C>>1ZC  
k|_ >I  
  四、小结 .W-=VzWX  
OHF:E44k  
  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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