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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: B-dlm8gX  
  doH2R @  
  一、实现方法 4,zvFH*AH  
}! =U^A)  
  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: C#$6O8O  
gY%&IHQ'  
#pragma data_seg("shareddata") ;Z4o{(/zU  
HHOOK hHook =NULL; //钩子句柄 AWL[zixR  
UINT nHookCount =0; //挂接的程序数目 ~v\hIm3=m  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 s ^3[W0hL  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 zLK\I~rU!  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey pw;r 25   
static int KeyCount =0; f8#*mQ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 6qDfcs  
#pragma data_seg() |lE-&a$xd  
_25d%Ne0  
  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。 pI 5_Hg  
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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: Pxk0(oBX  
*`1bc'umM;  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR S\b K+  
cKey,UCHAR cMask) niQcvnT4b  
{ #]X2^ND4 7  
 BOOL bAdded=FALSE; sbA2W~:  
 for(int index=0;index<MAX_KEY;index++){ %Zu Ll(  
  if(hCallWnd[index]==0){ (Xj.iP  
   hCallWnd[index]=hWnd; >|(%2Zl  
   HotKey[index]=cKey; pX^=be_  
   HotKeyMask[index]=cMask; f)U6p  
   bAdded=TRUE; 5}7ISNP;f  
   KeyCount++; y<v|X2  
   break; T g{UK  
  } cyHU\!Z*Zq  
 } c>rKgx  
 return bAdded; {=6)SBjf  
} Vpw[B.v  
//删除热键 7$#rNYa,z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ke^d8Z.  
{ *:[b'D!A  
 BOOL bRemoved=FALSE; h(|;\~  
 for(int index=0;index<MAX_KEY;index++){ Zd+>  
  if(hCallWnd[index]==hWnd){ =+4 _j  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Hh@2m\HA  
    hCallWnd[index]=NULL; "4RQ`.S R  
    HotKey[index]=0; o"\{OX  
    HotKeyMask[index]=0; p>&S7M/9  
    bRemoved=TRUE; i3d y  
    KeyCount--; LGfmUb-{]  
    break; jJ c07r']  
   } >+SZd7p  
  } >"b[r  
 } aH  
 return bRemoved; kJ__:rS(T_  
} ^6#-yDZC@  
. wmkj  
5v+L';wx[T  
  DLL中的钩子函数如下: ?eVj8 $BQo  
%!yxC  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~ttKI4  
{ @C07k^j=U  
 BOOL bProcessed=FALSE; 8UYJye8  
 if(HC_ACTION==nCode) VRB~7\A5<)  
 { x RB7lV*  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ivD^HhG  
   switch(wParam) s|E%~j[9  
   {  E^82==R  
    case VK_MENU: W.p66IQwL&  
     MaskBits&=~ALTBIT; U&s(1~e\  
     break; pW7kj&a_.  
    case VK_CONTROL: G\):2Qz!|  
     MaskBits&=~CTRLBIT; `^zQ$au'u  
     break; FTbtAlqh<  
    case VK_SHIFT: Z7oaQ\fR  
     MaskBits&=~SHIFTBIT; @f%wd2  
     break; 6$DG.p  
    default: //judge the key and send message xh`Du|jvm  
     break; `T`c@A  
   } NU(^6  
   for(int index=0;index<MAX_KEY;index++){ Uqr{,-]5v  
    if(hCallWnd[index]==NULL) Q<C@KBiVE  
     continue; VT Vm7l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g/!Otgfu  
    { ff[C'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); c<>y!^g  
     bProcessed=TRUE; ~n8F7  
    } VD9J}bgJ  
   } cT I,1U  
  } /XN*)m  
  else if((lParam&0xc000ffff)==1){ //有键按下 P.!;Uf}32  
   switch(wParam) [{?;c+[  
   { T*8_FR<  
    case VK_MENU:  J(^ >?d'  
     MaskBits|=ALTBIT; \"t`W:  
     break; D*qzNT@`LR  
    case VK_CONTROL: Y6+k9$h  
     MaskBits|=CTRLBIT; P$Ax c/H  
     break; O8iu+}]/6  
    case VK_SHIFT: 0T=jR{j!o  
     MaskBits|=SHIFTBIT; uV!MW=)  
     break; W!y)Ho  
    default: //judge the key and send message GgT=t)}wu  
     break; C5cFw/',  
   } ')rD?Z9 ^  
   for(int index=0;index<MAX_KEY;index++){ VGfD;8]z  
    if(hCallWnd[index]==NULL) e`vUK.UoW  
     continue; {;\%!I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <e[!3,%L  
    { 3JTU^-S<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9W$m D w6f  
     bProcessed=TRUE; V!\n3i?i  
    } w9'H.L q  
   } q;KshpfRMD  
  } ^fG`DjA)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 g:;Ya?5N  
   for(int index=0;index<MAX_KEY;index++){ !\3 }R25  
    if(hCallWnd[index]==NULL) Qf" 6PJ  
     continue; =>P_mPP=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  5=*@l  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); )\(lg*?:  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ~T;K-9R  
   } )ynA:LXx  
  } 7L1\1E:!  
 } gW/QFZjY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2Qw )-EB  
} #wGQv  
\l>q Y(gu  
  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: %}\ vW  
K90D1sD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -aC!0O y`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); t7sUtmq  
DS.39NY  
  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: neK*jdaP  
5c*p2:]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) S$Qr@5  
{ 4RlnnXY  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) _,11EeW@  
 { iZsau2K  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 #/\pUK~km  
  SaveBmp(); u!m,ilAnd  
  return FALSE; m9v"v:Pw  
 } dCW0^k  
 …… //其它处理及默认处理 $,p.=j;P  
} >N :|Km\  
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nomu$|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。 InAU\! ew  
fma tc#G  
  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。 WT;.>F  
XCKY xv&  
  二、编程步骤 D >psh- ,1  
V< 2IIH5^  
  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"; cr2{sGn|  
]JkpRaP$  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 07~pf}  
!pG+Ak?  
  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; 0G+L1a-  
v+|@}9|Z  
  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;  aOaF&6'j  
N02zPC 8  
  5、 添加代码,编译运行程序。 K<Yn_G  
mrhsKmH  
三、程序代码 _%AJmt}  
Wm];pqN  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL a15,'v$O  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) B]&Lh~Im  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ f hVbJU  
#if _MSC_VER > 1000 >OF:"_fh  
#pragma once wghFGHgw  
#endif // _MSC_VER > 1000 oHYD_8'f  
#ifndef __AFXWIN_H__ 6R3"L]J  
#error include 'stdafx.h' before including this file for PCH %4QoF  
#endif # |[`1  
#include "resource.h" // main symbols U[K0{PbY  
class CHookApp : public CWinApp O('i*o4!}  
{ d=Rk\F'^J  
 public: ?CcR 7l  
  CHookApp(); GapX$Jb,p  
  // Overrides zav*  
  // ClassWizard generated virtual function overrides XHwZ+=v  
  //{{AFX_VIRTUAL(CHookApp) HV#?6,U}  
 public: O>)n*OsS  
  virtual BOOL InitInstance(); P_:?}h\  
  virtual int ExitInstance(); zsR  wF  
  //}}AFX_VIRTUAL hX{g]KE>  
  //{{AFX_MSG(CHookApp) +?4*,8Tmmz  
  // NOTE - the ClassWizard will add and remove member functions here. V{ 4i$'  
  // DO NOT EDIT what you see in these blocks of generated code ! 9Bbm7Gd  
  //}}AFX_MSG R#[QoyJ  
  DECLARE_MESSAGE_MAP() $1Q3Y'Q9  
}; $9j>VGf=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); n1k$)S$iiy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Wl9I`Itg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nr<}Hc^f-  
BOOL InitHotkey(); u&l>cJ'  
BOOL UnInit(); *SMoodFBS  
#endif |j.KFu845  
/ h 2*$  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 2@=cqD7x  
#include "stdafx.h" <;TP@-a  
#include "hook.h" rFt,36#  
#include <windowsx.h> @w.b |  
#ifdef _DEBUG ;f\R$u-  
#define new DEBUG_NEW !ch[I#&J-  
#undef THIS_FILE Vsm%h^]d  
static char THIS_FILE[] = __FILE__; "63zc 1  
#endif q\z=z$VR  
#define MAX_KEY 100 v4Fnh`{  
#define CTRLBIT 0x04 Gdc ~Lh  
#define ALTBIT 0x02 &VZmP5Gv  
#define SHIFTBIT 0x01 @xW"rX#7f  
#pragma data_seg("shareddata") &cn%4Er  
HHOOK hHook =NULL; .:r2BgL  
UINT nHookCount =0; eEg1-  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey qxg7cj2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 7~%  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey F$sF 'cw  
static int KeyCount =0; I;kUG_c(4  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Qzs\|KS  
#pragma data_seg() ZmR[5 mv@  
HINSTANCE hins; h[[/p {z  
void VerifyWindow(); h~=\/vF  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) n+RUPZ  
//{{AFX_MSG_MAP(CHookApp) /4wm}g9  
// NOTE - the ClassWizard will add and remove mapping macros here. vo}_%5v8  
// DO NOT EDIT what you see in these blocks of generated code! #qiGOpTF.  
//}}AFX_MSG_MAP [][:/~q!  
END_MESSAGE_MAP() (c*7VO;  
TS~Y\Cp  
CHookApp::CHookApp() cfy/*|  
{ t?#vb}_  
 // TODO: add construction code here, C[87f-g  
 // Place all significant initialization in InitInstance Hc_hO  
} U{za m  
R"\u b"]  
CHookApp theApp; C&d"#I  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9L)&n.t1  
{ r-\T}e2Gz  
 BOOL bProcessed=FALSE; QB.*R?A  
 if(HC_ACTION==nCode) ;?HZ,"^I  
 { M~g~LhsF  
  if((lParam&0xc0000000)==0xc0000000){// Key up dWq/)%@t  
   switch(wParam) q!9v}R3(  
   { v|,[5IY  
    case VK_MENU: 3 DO$^JJ.  
     MaskBits&=~ALTBIT; 1>*UbV<R;u  
     break; )T$f k  
    case VK_CONTROL: bTo@gJk n  
     MaskBits&=~CTRLBIT; X~Rk ,d3  
     break; !=q:> }g  
    case VK_SHIFT: i"\AyKiJ  
     MaskBits&=~SHIFTBIT; P/1UCITq}  
     break; ,$zSJzS  
    default: //judge the key and send message #G4~]Qml  
     break; Fh!!T%5>C  
   } \aJ-q?=  
   for(int index=0;index<MAX_KEY;index++){ 0u&?Zy9&  
    if(hCallWnd[index]==NULL) uYFcq  
     continue; }:c,S O!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7&;jje[ <g  
    { q3pN/f;kr,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); r* /XB0  
     bProcessed=TRUE; p#8LQP~0$  
    } P20]>Hg  
   } zN8V~M;  
  } AN:RY/ %Wo  
  else if((lParam&0xc000ffff)==1){ //Key down :x*|lz[  
   switch(wParam) r #6l?+W ;  
   { >-tH&X^  
    case VK_MENU: 'i h  
     MaskBits|=ALTBIT; E 4$h%5  
     break; 5 1CU@1Ie  
    case VK_CONTROL: Rcx'a:k  
     MaskBits|=CTRLBIT; /K<GN7vN  
     break; gkq RO19  
    case VK_SHIFT: Xw}Y!;<IEu  
     MaskBits|=SHIFTBIT; Rp%\`'+Xz  
     break; C4SD  
    default: //judge the key and send message :+dWJNY:  
     break; HV.|Eh_7  
   } ??e#E[bI  
   for(int index=0;index<MAX_KEY;index++) OTtanJ?  
   { YI\Cs=T/  
    if(hCallWnd[index]==NULL) c7TWAG_+  
     continue; 5P t}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [, szx1  
    { :7PSZc:xE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); XL&eJ  
     bProcessed=TRUE; a ~iEps  
    } 'N5r2JL[w  
   } Kg0\Pvg8?T  
  } [m+O0VK$  
  if(!bProcessed){ d(B;vL@R2V  
   for(int index=0;index<MAX_KEY;index++){ ]!Aze^7;  
    if(hCallWnd[index]==NULL) ~JmxW;|_x)  
     continue; OD@A+"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) O@(.ei*HJ!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); }${ZI  
   } &=yqWW?  
  } eiSO7cGy  
 } $O</akn;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \,IDLXqp  
} 1eR{~ ,  
yI)fu^  
BOOL InitHotkey() s8I77._s  
{ YrcC"  
 if(hHook!=NULL){ &7kSLat+9{  
  nHookCount++; sbiDnRf  
  return TRUE; 3SB7)8Id1  
 } /z-C :k\  
 else @_(@s*4W  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); J<$'^AR9"q  
  if(hHook!=NULL) T+{'W  
   nHookCount++; #?d>S;)+  
  return (hHook!=NULL); Ywb)h^{!  
} kC#B7*[RM  
BOOL UnInit() SD.*G'N&2f  
{ %fSk "%u%<  
 if(nHookCount>1){ 9NoPrR=x1  
  nHookCount--; 5xV/&N  
  return TRUE; 2iINQK$  
 } I$qtfGr  
 BOOL unhooked = UnhookWindowsHookEx(hHook); McI4oD~"  
 if(unhooked==TRUE){ {]m e?I  
  nHookCount=0; -a^sX%|Bl  
  hHook=NULL; =ir;m  
 } XV9'[V  
 return unhooked; s#Y7*?Sm  
} CvSG!l.6f<  
"dU#j,B2  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8o5^H>  
{ xMGd'l?  
 BOOL bAdded=FALSE; l|QFNW[i  
 for(int index=0;index<MAX_KEY;index++){ 3Eux-C!t  
  if(hCallWnd[index]==0){ &CsBG?@Z|  
   hCallWnd[index]=hWnd; R =c  
   HotKey[index]=cKey; lukRFN>c"  
   HotKeyMask[index]=cMask; G uI sM  
   bAdded=TRUE; /OtQk -E  
   KeyCount++; iQR})=Q  
   break; ?#y<^oNM  
  } [5#/& k{  
 } {7szo`U2  
 return bAdded; x@\'@>_GM  
} sOHAW*+  
6Kc7@oO~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NOr*+N\  
{ -Z& {$J  
 BOOL bRemoved=FALSE; +|w~j#j9`  
 for(int index=0;index<MAX_KEY;index++){ aRKG)0=  
  if(hCallWnd[index]==hWnd){ 1{glRY'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ e ^& 8x  
    hCallWnd[index]=NULL; g}j>;T  
    HotKey[index]=0; , &f20o  
    HotKeyMask[index]=0; )8>f  
    bRemoved=TRUE; O g~"+IGp  
    KeyCount--; {8Nd-WJ{  
    break; lGgKzi9VD  
   } c{P`oB8  
  } W n mRRq^  
 } qq{N; C  
 return bRemoved; ]lG\t'R  
} &otgN<H9  
i58CA?  
void VerifyWindow() Yx/~8K_%M?  
{ +FK<j;}C7  
 for(int i=0;i<MAX_KEY;i++){  } R6h  
  if(hCallWnd!=NULL){ j_<n~ri-  
   if(!IsWindow(hCallWnd)){ D[y|y 3F  
    hCallWnd=NULL; 3&2q\]Y,  
    HotKey=0; b,A1(_pzi  
    HotKeyMask=0; 5Rp2O4Z  
    KeyCount--; tzN;;h4C  
   } e;3 (,  
  } ^>28>!"1  
 } hiM!htc;M  
} >#|Q,hVU5  
R;ug+N  
BOOL CHookApp::InitInstance() IbQ~f+y&2  
{ Q1B! W  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); |0%UM}  
 hins=AfxGetInstanceHandle(); Jxp'.oo[  
 InitHotkey(); !XC7F UO  
 return CWinApp::InitInstance(); J#WPXE+Ds  
} ,i.P= o  
5!%/j,?  
int CHookApp::ExitInstance() #8|NZ6x,  
{ '2#fkH[.  
 VerifyWindow(); >>xV-1h:  
 UnInit(); *(IO<KAg8  
 return CWinApp::ExitInstance(); " <AljgF  
} &|;!St]!M  
( #Aq*2Z.  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file DF =. G1  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) W=w@SO_?wp  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ylJlICK  
#if _MSC_VER > 1000 L  *@>/N  
#pragma once Cu7iHhY5  
#endif // _MSC_VER > 1000 5xKR ]u  
Yl=  |P`  
class CCaptureDlg : public CDialog B9-=.2.WU  
{ s[bKGn@  
 // Construction  S_6;e|  
 public: 5+Ut]AL5  
  BOOL bTray; \ed(<e>  
  BOOL bRegistered; NQD b;5:  
  BOOL RegisterHotkey(); n-_w0Y  
  UCHAR cKey; jm"xf7  
  UCHAR cMask; pn|{P<b\  
  void DeleteIcon(); "de:plMofy  
  void AddIcon(); HOG7||&y  
  UINT nCount; Kwnu|8  
  void SaveBmp(); ;0E 4S  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor p,fin?nW c  
  // Dialog Data =;T[2:JUu  
  //{{AFX_DATA(CCaptureDlg) p04w 83 jX  
  enum { IDD = IDD_CAPTURE_DIALOG }; V5 w^Le_^  
  CComboBox m_Key; W&#Nk5d  
  BOOL m_bControl; G7?EaLsfQ  
  BOOL m_bAlt; N h%8;  
  BOOL m_bShift; q[ZYlF,Ho  
  CString m_Path; }J`Gm  
  CString m_Number; j!rz@Y3  
  //}}AFX_DATA )-oNy-YL  
  // ClassWizard generated virtual function overrides Sm5"Q  
  //{{AFX_VIRTUAL(CCaptureDlg) \266N;JrN  
 public: w@We,FUJN  
  virtual BOOL PreTranslateMessage(MSG* pMsg); j!dklQh0  
 protected: \ZH=$c*W  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,s K-gw  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }S4Fy3)  
  //}}AFX_VIRTUAL J)]W[Nk  
  // Implementation @<L.#gtP  
 protected: CqV \:50g  
  HICON m_hIcon; P/ 5r(l5  
  // Generated message map functions ?1sY S  
  //{{AFX_MSG(CCaptureDlg) fBmx +7  
  virtual BOOL OnInitDialog(); T /uu='3  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); i%2K%5{)$D  
  afx_msg void OnPaint(); V96BtV sB  
  afx_msg HCURSOR OnQueryDragIcon(); W0k_"uI  
  virtual void OnCancel(); 2~ a4ib  
  afx_msg void OnAbout(); ly2R8$Y`y`  
  afx_msg void OnBrowse(); ,D1QJPM  
  afx_msg void OnChange(); |HLh?AcX  
 //}}AFX_MSG uwJkqlUOz  
 DECLARE_MESSAGE_MAP() 1+'3{m \5T  
}; +zvK/Fj2q  
#endif z,WrLZC  
)U` c9*.  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file |u[gI+TUE  
#include "stdafx.h" -}s?!Pg>  
#include "Capture.h" JYq} YG=%  
#include "CaptureDlg.h" 7w|s8B  
#include <windowsx.h> #<{MtK_  
#pragma comment(lib,"hook.lib") p[Es4S}N  
#ifdef _DEBUG r|+Zni]  
#define new DEBUG_NEW IkkrnG8  
#undef THIS_FILE 1mqFnVkf&+  
static char THIS_FILE[] = __FILE__; 9]iDNa/D  
#endif 5:wf"3%%  
#define IDM_SHELL WM_USER+1 5VfP@{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :([,vO:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _19k@a  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; A}8U;<\Ig  
class CAboutDlg : public CDialog IftPN6(Z  
{ %?seX+ne  
 public: N ~Gh>{N  
  CAboutDlg(); :L,]<n  
  // Dialog Data We|*s2!  
  //{{AFX_DATA(CAboutDlg) @Hzsud  
  enum { IDD = IDD_ABOUTBOX }; 'CvZiW[_r  
  //}}AFX_DATA Vufw:}i+^  
  // ClassWizard generated virtual function overrides <[Vr(.A  
  //{{AFX_VIRTUAL(CAboutDlg) w jF\>  
 protected: @)}U\=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support HDYf^mcW  
  //}}AFX_VIRTUAL kI]1J  
  // Implementation w[XW>4x K  
 protected: BLRrHaX0  
  //{{AFX_MSG(CAboutDlg) !u"Hf7/  
  //}}AFX_MSG Y+E@afsKs  
  DECLARE_MESSAGE_MAP() $[d}g  
}; 8cHZBM7'  
iZ UBw  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Y:wds=lA  
{ +=O:z *O  
 //{{AFX_DATA_INIT(CAboutDlg) ;iEqa"gO  
 //}}AFX_DATA_INIT E_? M&  
} <]<50  
;Zw28!#Rt  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) u^uW<.#z  
{ |R4](  
 CDialog::DoDataExchange(pDX); x/ez=yd*l  
 //{{AFX_DATA_MAP(CAboutDlg) xucV$[f  
 //}}AFX_DATA_MAP +{s^"M2`  
} aaBBI S  
W\Gg!XsLk  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2b<0g@~X  
 //{{AFX_MSG_MAP(CAboutDlg) z}5XLa^  
 // No message handlers \%K6T)9  
 //}}AFX_MSG_MAP 9X-DR  
END_MESSAGE_MAP() =LC5o2bLy  
= #`FXO1C  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Q{%ow:;s*  
: CDialog(CCaptureDlg::IDD, pParent) lm+wjhkN  
{ `bi5#xR  
 //{{AFX_DATA_INIT(CCaptureDlg) GRNH!:e  
  m_bControl = FALSE; yfU1;MI  
  m_bAlt = FALSE; |1neCP@ng  
  m_bShift = FALSE; Y=5hm  
  m_Path = _T("c:\\"); rkD(K G9E  
  m_Number = _T("0 picture captured."); %Z.!Bm:  
  nCount=0; P?I"y,_ p  
  bRegistered=FALSE; XjV7Ew^7  
  bTray=FALSE; - na]P3 s  
 //}}AFX_DATA_INIT Tb}b*d3  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ALG +  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); }"szL=s  
} ,HkJ.6KF  
35ng_,t $  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) </fzBaTo  
{ V3UEuA  
 CDialog::DoDataExchange(pDX); n4ISHxM  
 //{{AFX_DATA_MAP(CCaptureDlg) =[P||  
  DDX_Control(pDX, IDC_KEY, m_Key); f}fM%0/5  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); bv+PbK]iO  
  DDX_Check(pDX, IDC_ALT, m_bAlt); g}f@8;TY  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ;;2s{{(R  
  DDX_Text(pDX, IDC_PATH, m_Path); <|{=O9  
  DDX_Text(pDX, IDC_NUMBER, m_Number); J9o ]$.e  
 //}}AFX_DATA_MAP /rquI y^  
} #PiW\Tq  
6pH.sX$!_  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 2 nf{2edC  
//{{AFX_MSG_MAP(CCaptureDlg) Y,+$vj:y8  
 ON_WM_SYSCOMMAND() CzwnmSv{.  
 ON_WM_PAINT() H7uW|'XWz  
 ON_WM_QUERYDRAGICON() +UB. M  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) KjhOz%Yt[o  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) S-im o  
 ON_BN_CLICKED(ID_CHANGE, OnChange) H:CwUFL  
//}}AFX_MSG_MAP \E n^Vf  
END_MESSAGE_MAP() RxAZ<8T_  
kw!! 5U;7  
BOOL CCaptureDlg::OnInitDialog() V%"aU}   
{ }^=J]  
 CDialog::OnInitDialog(); (*#S%4(YX  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); # TvY*D,  
 ASSERT(IDM_ABOUTBOX < 0xF000); NZv1dy`fa  
 CMenu* pSysMenu = GetSystemMenu(FALSE); }4$UlTA'  
 if (pSysMenu != NULL) .}^m8PP  
 { vzfWPjpKW  
  CString strAboutMenu; l{kum2DT  
  strAboutMenu.LoadString(IDS_ABOUTBOX); |_Vlw&qu+  
  if (!strAboutMenu.IsEmpty()) f- _~rQ  
  { 1;>J9  
   pSysMenu->AppendMenu(MF_SEPARATOR); ]@_*O$  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /CH*5w)1   
  } 6z~6o0s~  
 } L9@nx7D  
 SetIcon(m_hIcon, TRUE); // Set big icon _/hWzj=q  
 SetIcon(m_hIcon, FALSE); // Set small icon W<\KRF$S;  
 m_Key.SetCurSel(0); -_B*~M/vV`  
 RegisterHotkey(); 3d[fP#NY7  
 CMenu* pMenu=GetSystemMenu(FALSE); gd2cwnP  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); li(g?|AD  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); iOw'NxmY  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); GP1b/n3F1  
 return TRUE; // return TRUE unless you set the focus to a control }DoNp[`  
} L_Z>*s&  
q5Z]Z.%3O  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]5wc8Kh"  
{ _pL:dKfy7  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) t}+P|$[  
 { \#L}KW  
  CAboutDlg dlgAbout; (r.[b  
  dlgAbout.DoModal(); bIR7g(PJ.b  
 } Rkgpa/te"  
 else rQCj^=cf;~  
 { Ean #>h  
  CDialog::OnSysCommand(nID, lParam); ht)J#Di  
 } ',~,hJ0  
} I~|.Re9a  
xzh`q  
void CCaptureDlg::OnPaint() ApR>b%  
{ *{ 6{ZKM  
 if (IsIconic()) xO{yr[x"L  
 { DYx3 NDX7  
  CPaintDC dc(this); // device context for painting it \3-  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); oUoDj'JN{  
  // Center icon in client rectangle ve<D[jQsk  
  int cxIcon = GetSystemMetrics(SM_CXICON); rjz$~(&m6  
  int cyIcon = GetSystemMetrics(SM_CYICON); :A"GO c,  
  CRect rect; 4;=+qb  
  GetClientRect(&rect); ]sB-}n)  
  int x = (rect.Width() - cxIcon + 1) / 2; | bDUekjR  
  int y = (rect.Height() - cyIcon + 1) / 2; ,Tjc\;~%  
  // Draw the icon _ ZMoPEW  
  dc.DrawIcon(x, y, m_hIcon); Q3T@=z2j%  
 } e-Mei7{%  
 else VBo=*gn,$  
 { C8ek{o)%W  
  CDialog::OnPaint(); Dg W*Br8<  
 } Y'H|Tk^`  
} d#NG]V/   
G*^4+^Vz?  
HCURSOR CCaptureDlg::OnQueryDragIcon() GUSEbIz):  
{ )H8Rfn?  
 return (HCURSOR) m_hIcon; NH~\kV  
} k^K>*mcJ  
jnho *,X  
void CCaptureDlg::OnCancel() OlI|.~  
{ 4SlEc|'7@  
 if(bTray) j`7q7}  
  DeleteIcon(); @~sJ ((G[5  
  CDialog::OnCancel(); u7L&cx  
} gM>geWB<  
v[57LB  
void CCaptureDlg::OnAbout() ebfT%_N  
{ 05hjC  
 CAboutDlg dlg; LD/NMb  
 dlg.DoModal(); *MC+i$  
} _Oc5g5_{  
-?nr q <3  
void CCaptureDlg::OnBrowse() O/ybqU\7  
{ t\S=u y  
 CString str; xl>8B/Zmf#  
 BROWSEINFO bi; kn %i#Fz  
 char name[MAX_PATH]; Y].,}}9k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); #83`T&Xw*  
 bi.hwndOwner=GetSafeHwnd(); 7 x#QkImQ  
 bi.pszDisplayName=name; {#y~ Qk;T  
 bi.lpszTitle="Select folder"; x18(}4  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; }2%L 0  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 37<^Oly!  
 if(idl==NULL) n37P$0  
  return; ?&Ug"$v  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); XSHK7vpMf  
 str.ReleaseBuffer(); N(s5YX7<hd  
 m_Path=str; wAD%1;  
 if(str.GetAt(str.GetLength()-1)!='\\') YpJJ]Rszg  
  m_Path+="\\"; VDT.L,9  
 UpdateData(FALSE); tzJ7wXRr  
} aGBUFCCa  
zCji]:  
void CCaptureDlg::SaveBmp() 18nT Iz_  
{ @k+ K_gR  
 CDC dc; /Ixv{H)H  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); f*o+g:]3  
 CBitmap bm; L _D#  
 int Width=GetSystemMetrics(SM_CXSCREEN); z=/&tRe W  
 int Height=GetSystemMetrics(SM_CYSCREEN); YC[c QX  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 7D&O5Z=%+  
 CDC tdc; FRhHp(0}5  
 tdc.CreateCompatibleDC(&dc); ;x.5_Xw{.  
 CBitmap*pOld=tdc.SelectObject(&bm); 3FY87R   
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); j[CXIz?c  
 tdc.SelectObject(pOld); <c3Te$.  
 BITMAP btm; oZ5 ,y+L4  
 bm.GetBitmap(&btm); L9{y1'')  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; L;h|Sk]{  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); fDjJdRS"  
 BITMAPINFOHEADER bih; 4v.{C"M  
 bih.biBitCount=btm.bmBitsPixel; jZr"d*Y  
 bih.biClrImportant=0; 7?ICXhu9  
 bih.biClrUsed=0; UMUG~P&@  
 bih.biCompression=0; TrPw*4h 9s  
 bih.biHeight=btm.bmHeight; +?)R}\\  
 bih.biPlanes=1; #(7^V y&  
 bih.biSize=sizeof(BITMAPINFOHEADER); 'pj*6t1~  
 bih.biSizeImage=size; >t#5eT`_ w  
 bih.biWidth=btm.bmWidth; dk/f_m  
 bih.biXPelsPerMeter=0; F1*xY%Jv^M  
 bih.biYPelsPerMeter=0; |_njN  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); S ^]mF>xX8  
 static int filecount=0; 1 HY K& ',  
 CString name; %/oeV;D  
 name.Format("pict%04d.bmp",filecount++); Cz|F%>y#  
 name=m_Path+name; NK\0X5##.  
 BITMAPFILEHEADER bfh; i&^]qL|J  
 bfh.bfReserved1=bfh.bfReserved2=0; AO]k*N,N  
 bfh.bfType=((WORD)('M'<< 8)|'B'); s+t[{i4|  
 bfh.bfSize=54+size; T*z*x=<5  
 bfh.bfOffBits=54; ka/>jV"  
 CFile bf; )LAG$Cn  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ m$bYx~K  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); \NTVg6>qN  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); X2T_}{  
  bf.WriteHuge(lpData,size); i&KBMx   
  bf.Close(); tH=jaFJ   
  nCount++; <!=:{&d%  
 } %6\L^RP  
 GlobalFreePtr(lpData); 4&AGVplgF  
 if(nCount==1) > -,$  
  m_Number.Format("%d picture captured.",nCount); {4{X`$  
 else vM?,#:5  
  m_Number.Format("%d pictures captured.",nCount); <ivq}(%72  
  UpdateData(FALSE); v]\T&w%9  
} ioBYxbY`  
^+w1:C5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) v:"Y  
{ l} @C'Np  
 if(pMsg -> message == WM_KEYDOWN) !Qq~lAJO;  
 { Lb#PiTJI  
  if(pMsg -> wParam == VK_ESCAPE) -H F1c  
   return TRUE; `-MCI)Fq_R  
  if(pMsg -> wParam == VK_RETURN) &o]fBdn  
   return TRUE; cJ\ 1ndBH  
 } vRb7=fXf  
 return CDialog::PreTranslateMessage(pMsg); lWDSF]ZYV  
} }Te+Rv7{E  
'w0?-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ASB3|uy_  
{ lS|F&I5j  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ K5 EJ#1ov  
  SaveBmp(); G<P/COI#M5  
  return FALSE; [0D.+("EW  
} q'9;  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ [e>2HIS,  
 CMenu pop; =gC% =  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); /[5\T2GI   
 CMenu*pMenu=pop.GetSubMenu(0); 1,Jy+1G0w  
 pMenu->SetDefaultItem(ID_EXITICON); >y+?Sz!  
 CPoint pt; @O/"s~d-  
 GetCursorPos(&pt); Wcbm,O4u  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); drvz [ 9;  
 if(id==ID_EXITICON) )-m/(-  
  DeleteIcon(); ,#bT  
 else if(id==ID_EXIT) ^fV-m&F)K*  
  OnCancel(); \E6 0  
 return FALSE; `_sKR,LhB  
} XqGa]/;}  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); cSjX/%*!m  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) xt6%[)  
 AddIcon(); cd`P'GDF  
 return res; g'Wr+( A_  
} Z 5g*'  
MO? }$j  
void CCaptureDlg::AddIcon() )Fw#]~Z  
{ y Ni3@f  
 NOTIFYICONDATA data; H vHy{S4  
 data.cbSize=sizeof(NOTIFYICONDATA); ]F"P3':  
 CString tip;  He%v4S  
 tip.LoadString(IDS_ICONTIP); >U.7>K V&  
 data.hIcon=GetIcon(0); {N << JX  
 data.hWnd=GetSafeHwnd(); ^9]g5.z:  
 strcpy(data.szTip,tip); H6Ytp^~>  
 data.uCallbackMessage=IDM_SHELL; _0y]U];ce  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; OKAmw >{  
 data.uID=98; 21my9Ui]  
 Shell_NotifyIcon(NIM_ADD,&data); ps^["3e  
 ShowWindow(SW_HIDE); *uSlp_;kB  
 bTray=TRUE; ZENblh8fs  
} +Ht(_+To1  
T+PERz(  
void CCaptureDlg::DeleteIcon() ~>Y^?l  
{ Q3'P<"u  
 NOTIFYICONDATA data; q;#bFPh  
 data.cbSize=sizeof(NOTIFYICONDATA); -v:3#9uX)  
 data.hWnd=GetSafeHwnd(); Md0`/F:+2  
 data.uID=98; 3[@:I^q  
 Shell_NotifyIcon(NIM_DELETE,&data); 2Sk hBb=d  
 ShowWindow(SW_SHOW); |"[;0)dw^  
 SetForegroundWindow(); #=72 /[  
 ShowWindow(SW_SHOWNORMAL); cYvt!M\ed  
 bTray=FALSE; r?|(t?  
} g-H,*^g+  
W)^%/lAh  
void CCaptureDlg::OnChange() b~{nS,_Rn  
{ :UX8^+bfZ  
 RegisterHotkey(); -c{Y+M`  
} '$VP\Gj.  
M,cz7,  
BOOL CCaptureDlg::RegisterHotkey() IR?nH`V  
{ >QPCYo<E  
 UpdateData(); ]bbP_n8  
 UCHAR mask=0; 3NdO3-~)  
 UCHAR key=0; ti3S'K0t  
 if(m_bControl) }S4+1 U3  
  mask|=4; %L$ ?Mey  
 if(m_bAlt) 8w#4T:hsuN  
  mask|=2; 7#N ?{3i  
 if(m_bShift) ~+,ZD)AKi4  
  mask|=1; jAovzZ6BL  
  key=Key_Table[m_Key.GetCurSel()]; %zR5q  Lb  
 if(bRegistered){ :2+z_+k}<  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3#aLCpVla  
  bRegistered=FALSE; ^5)=) xVF  
 } {E}D6`{  
 cMask=mask; x TqP`ljX  
 cKey=key; #ApmJLeCO  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); cEn|Q  
 return bRegistered; #Zi6N  
} ]AZCf`7/?  
~jzT;9:  
  四、小结 p@h<u!rL8  
ZXf& pqmG  
  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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