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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: @*"H{xo.U  
  V)#rP?Y  
  一、实现方法 L3|~ i&k  
#:M <<gk  
  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: D?`|`Mu  
!6pE0(V^+4  
#pragma data_seg("shareddata") 1qN+AT  
HHOOK hHook =NULL; //钩子句柄 W_Eur,/`  
UINT nHookCount =0; //挂接的程序数目 w+G+&ak<  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 &+Yoob]P  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1  ie4BE'  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey u[+/WFH  
static int KeyCount =0; U "kD)\  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 XTS%:S  
#pragma data_seg() ?A2jj`N1x  
M) Z3q  
  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。 #@8JYzMq%  
q-R'5p\C?|  
  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: (^9dp[2  
YAJr@v+Ls  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR uraT$Q}  
cKey,UCHAR cMask) ,); -v4$  
{ F_z1ey`t  
 BOOL bAdded=FALSE; -E,p[Sp  
 for(int index=0;index<MAX_KEY;index++){ rls\3 R(jt  
  if(hCallWnd[index]==0){ l#^weXSlk  
   hCallWnd[index]=hWnd; MGfIA?u  
   HotKey[index]=cKey; _}3NLAqg  
   HotKeyMask[index]=cMask; 3JXKp k?   
   bAdded=TRUE; GPLq$^AH  
   KeyCount++; w3Z;&sFd  
   break; P{%R*hb]  
  } U?&&yynK  
 } U2HAIV8  
 return bAdded; .u\xA7X  
} Q@5v> `  
//删除热键 /& wA$h  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /@feY?glc  
{ L6n<h  
 BOOL bRemoved=FALSE; 5rlZ'>I.  
 for(int index=0;index<MAX_KEY;index++){ p$_X\,F  
  if(hCallWnd[index]==hWnd){ t;L7H E@Y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ EU4j'1!&g<  
    hCallWnd[index]=NULL; .g52p+Z#  
    HotKey[index]=0; a`_w9r+v  
    HotKeyMask[index]=0; d8% sGH  
    bRemoved=TRUE; 'RzzLk|$  
    KeyCount--; o7 1f<&1  
    break; M TOZ:b  
   } H`EsFKw\%  
  } hYY-Eq4TC  
 } ,Uu#41ZOKL  
 return bRemoved; 6):iu=/i/  
} q~G@S2=}0}  
P2=u-{?~  
6y   
  DLL中的钩子函数如下: a n,$Z,G#K  
_&}z+(Ug  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <nbc RO.  
{ Dx>~^ ^<  
 BOOL bProcessed=FALSE; *28:|blbL  
 if(HC_ACTION==nCode) [E6ZmMB&  
 { A`ScAzx5{  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ^zVW 3 Y q  
   switch(wParam) Q/^a(   
   {  .qg 2zE$0  
    case VK_MENU: KvkU]s_  
     MaskBits&=~ALTBIT; E0aJ~A(Hv  
     break; Ae|bAyAK  
    case VK_CONTROL: N5|wBm>m  
     MaskBits&=~CTRLBIT; ;noZmPa  
     break; <g'0q*qE  
    case VK_SHIFT: ZZJ<JdD  
     MaskBits&=~SHIFTBIT; |eEXCn3{  
     break; j5V{,lf  
    default: //judge the key and send message r>Cv@4/j  
     break; {RHa1wc  
   } 35Cm>X  
   for(int index=0;index<MAX_KEY;index++){ }E&48$0h  
    if(hCallWnd[index]==NULL) 9 gWqs'  
     continue; 5[|ZceY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'NSfGC%7R  
    { u?lbC9}$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5 ]l8l+  
     bProcessed=TRUE; z\+Ug9Of  
    } (;cvLop  
   } *TC#|5  
  } h$$2(!G4  
  else if((lParam&0xc000ffff)==1){ //有键按下 R&FO-{S  
   switch(wParam) `<IaQY  
   { 5"2pU{xmK  
    case VK_MENU: #?klVK&e/  
     MaskBits|=ALTBIT; yLEA bd%+  
     break; Pm== m9  
    case VK_CONTROL: H.#zbKj  
     MaskBits|=CTRLBIT; !A'3Mw\Nm  
     break; ;kR+jC(  
    case VK_SHIFT: pz,iQUs _o  
     MaskBits|=SHIFTBIT; y?ypRCgO.u  
     break; HA]5:ck  
    default: //judge the key and send message Gc2:^FVlh  
     break; uow{a*q d6  
   } Zx U?d   
   for(int index=0;index<MAX_KEY;index++){ jWcfQ  
    if(hCallWnd[index]==NULL) Z^6qxZJ7  
     continue; KU 98"b5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (65|QA   
    { {q.|UCg[L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3%YDsd vQx  
     bProcessed=TRUE; { \ ]KYI0  
    } lnv&fu`1P  
   } t 4>\ ;  
  } %eW2w@8]  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地  LXf *  
   for(int index=0;index<MAX_KEY;index++){ ~w"e 2a  
    if(hCallWnd[index]==NULL) mG.H=iw  
     continue; 2*TPW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) nZ8jBCh  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); e1Bqd+  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 qTI_'q  
   } |)+45e  
  } Mc /= Fs  
 } 2|$G<f  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); zCI.^^<?  
} L-VisZ-FK  
k293 wS  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: y_{fc$_&  
M=#g_*d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m\@q2l-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .RN2os{  
LjPpnjU  
  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: WuMr";2*E  
'Oa(]Br[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) V~]&1  
{ u$ff %`E  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ,Y`TP4Ip  
 { w 3$9  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 v?s%qb=T  
  SaveBmp(); !n|4w$t"V  
  return FALSE; e~PAi8B5  
 } !a^'Jbb  
 …… //其它处理及默认处理 H' %#71  
} Lv7$@|"H9  
sDP8!  
} bm ^`QY  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 .wf$]oQQ  
'pC51}[A{^  
  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。 C(&3L[  
tb;u%{S  
  二、编程步骤 51Q~/  
vBYk"a6SD  
  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"; g]jCR*]  
g<^-[w4/  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; G!E1N(%o  
,$bK)|pGV  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; q" @%WK  
SY$%)(c8kL  
  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; %OJq(}  
)M_|r2dDq3  
  5、 添加代码,编译运行程序。 %,f(jQfg_  
:ioD  *k  
三、程序代码 E{]PfUfFY  
D| g{]nO  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5E0dX3-  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) `qhZZ{s)1U  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ pReSvF}}C  
#if _MSC_VER > 1000 :|\)=4  
#pragma once w:/QB-`%  
#endif // _MSC_VER > 1000 ky I~  
#ifndef __AFXWIN_H__ >Do P2]  
#error include 'stdafx.h' before including this file for PCH yeIc Q%  
#endif xP $\ }  
#include "resource.h" // main symbols %H3 M0J2L  
class CHookApp : public CWinApp 7.bPPr&  
{ V-x/lo]Co  
 public: x,UP7=6  
  CHookApp(); qL~|bfN  
  // Overrides ZG8Xr "  
  // ClassWizard generated virtual function overrides *Ke\Yb  
  //{{AFX_VIRTUAL(CHookApp) lK3{~ \J-  
 public: 9YY*)5eyD  
  virtual BOOL InitInstance(); =i>i,>bv  
  virtual int ExitInstance(); gXe`G( w  
  //}}AFX_VIRTUAL +Sak_*fq  
  //{{AFX_MSG(CHookApp) tC\(H=ecP  
  // NOTE - the ClassWizard will add and remove member functions here. !YIW8SP)  
  // DO NOT EDIT what you see in these blocks of generated code ! `Hd~H  
  //}}AFX_MSG $fG~;`T  
  DECLARE_MESSAGE_MAP() 4nKlW_{,  
}; I 8VCR8q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); )wCV]TdF  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NE+ ;<mW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); PG@6*E  
BOOL InitHotkey(); 5G l:jRu  
BOOL UnInit(); 30{WGc@l#  
#endif ~2[mZias  
-`,F e3  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ahg]OWn#  
#include "stdafx.h" kHd`k.nW  
#include "hook.h" gmN$}Gy}  
#include <windowsx.h> t>h:s3c  
#ifdef _DEBUG +^ `n- m  
#define new DEBUG_NEW JzmX~|=Xi  
#undef THIS_FILE <\oD4EE_  
static char THIS_FILE[] = __FILE__; 3`Gb ;D  
#endif gbziEjRe  
#define MAX_KEY 100 Zx)gLDd  
#define CTRLBIT 0x04 m.Ki4NUm  
#define ALTBIT 0x02 lQ#='Jqfp  
#define SHIFTBIT 0x01 Zty9O8g  
#pragma data_seg("shareddata") 23/;W|   
HHOOK hHook =NULL; sE!$3|Q  
UINT nHookCount =0; HM &"2c  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 3|=L1Pw#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT @0-vf>e3-  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey F"0=r  
static int KeyCount =0; 0}N"L ml  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift =)nJ'}x  
#pragma data_seg() .qs5xGg#9  
HINSTANCE hins; _FkIg>s  
void VerifyWindow(); f"t+r /d  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) i0rh {Ko  
//{{AFX_MSG_MAP(CHookApp) Y{9xF8#  
// NOTE - the ClassWizard will add and remove mapping macros here. <aQ5chf7  
// DO NOT EDIT what you see in these blocks of generated code! #3_ @aq*  
//}}AFX_MSG_MAP .p(%gmOp#  
END_MESSAGE_MAP() ~8U0(n:^  
iJS7g  
CHookApp::CHookApp() k(M(]y_  
{ @4=Az1W*  
 // TODO: add construction code here, {!^0j{T  
 // Place all significant initialization in InitInstance *M'/z=V?%  
} 7yUX]95y8  
]E^)d|_  
CHookApp theApp; yaPx=^&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) j[Gg[7q{y  
{ |z?c>.  
 BOOL bProcessed=FALSE; fT{%zJU  
 if(HC_ACTION==nCode) z/wwe\ a5  
 { }!N/?A5  
  if((lParam&0xc0000000)==0xc0000000){// Key up p{AX"|QM"  
   switch(wParam) ;*cCaB0u  
   { FT\%=>{  
    case VK_MENU: "6gBbm  
     MaskBits&=~ALTBIT; p\DSFB  
     break; 4@QR2K|  
    case VK_CONTROL: <[?ZpG  
     MaskBits&=~CTRLBIT; f([d/  
     break; Y(=A HmR  
    case VK_SHIFT: Qcn;:6_&W  
     MaskBits&=~SHIFTBIT; ,,]<f*N  
     break; |IDZMd0  
    default: //judge the key and send message r! ~6.  
     break; L| ;WE=  
   } otlv ;3263  
   for(int index=0;index<MAX_KEY;index++){ eU\XAN#@  
    if(hCallWnd[index]==NULL) *z&hXYm  
     continue; {RI)I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .mplML0oW  
    { u{S"NEc  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "-S@R=bi  
     bProcessed=TRUE; >65\  
    } p3 V?n[/}  
   } 9# #(B  
  } *d9RD~Ee  
  else if((lParam&0xc000ffff)==1){ //Key down U#|6n ,  
   switch(wParam) B7PdavO#  
   { US\h,J\Ju  
    case VK_MENU: ]I\9S{?  
     MaskBits|=ALTBIT; Uh+6fE]p  
     break; ]q/USVj{  
    case VK_CONTROL: 3sp-0tUE  
     MaskBits|=CTRLBIT; B_* Ayk  
     break; D9!$H!T _  
    case VK_SHIFT: 9-!GYa'Z  
     MaskBits|=SHIFTBIT; Z9eP(ip  
     break; g]E3+:5dk  
    default: //judge the key and send message q@1xYz:J  
     break; E] rBq_S  
   } /7x1Z*Hg  
   for(int index=0;index<MAX_KEY;index++) e-#V s{?|r  
   { y-{?0mLq  
    if(hCallWnd[index]==NULL) }s[`T   
     continue; e m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^U##9KkP  
    { ] !n3j=*   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ZEso2|   
     bProcessed=TRUE; Mbn;~tY>  
    } TX;)}\  
   } ^bq,+1;@Q  
  } 28vQ  
  if(!bProcessed){ ;SX~u*`R  
   for(int index=0;index<MAX_KEY;index++){ zbgGK7  
    if(hCallWnd[index]==NULL) d4p6.3  
     continue; 3-'3w,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .A0fI";Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); s6'=4gM  
   } ?!O4ia3nFk  
  } 0o:R:*  
 } %m+7$iD  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -hc8IS  
} wD4[UU?  
]LEaoOecu  
BOOL InitHotkey() pw`'q(ad  
{ R:j mn  
 if(hHook!=NULL){ ~+ 9v z  
  nHookCount++; #jd.i  
  return TRUE; N,l"9>CF  
 } +bT[lJ2O>G  
 else G4&?O_\;  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); U`5/tNx  
  if(hHook!=NULL) \>G}DGz  
   nHookCount++; t#3 _M=L  
  return (hHook!=NULL); `5!AHQ/  
} fI1 9p Q  
BOOL UnInit() $/|vbe,  
{ g>k?03;  
 if(nHookCount>1){ ]"~ x  
  nHookCount--; Y B,c=Wx  
  return TRUE; kW1w;}n$  
 } ~Z!YB,)bp  
 BOOL unhooked = UnhookWindowsHookEx(hHook); n$v4$_qS  
 if(unhooked==TRUE){ WA0D#yuJ/  
  nHookCount=0; 1vxQ`)a  
  hHook=NULL; Gp+\}<^ Z  
 } !0vLSF=  
 return unhooked; b`@C#qB  
} :HwdXhA6  
EB*C;ms  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &AWrM{e  
{ }2iR=$2  
 BOOL bAdded=FALSE; H5 V>d  
 for(int index=0;index<MAX_KEY;index++){ e<*qaUI  
  if(hCallWnd[index]==0){ F-oe49p5e  
   hCallWnd[index]=hWnd; >\w]i*%  
   HotKey[index]=cKey; vB}c6A4'U  
   HotKeyMask[index]=cMask; r7L.W  
   bAdded=TRUE; 1z-A3a/-  
   KeyCount++; v/=\(  
   break; >^GV #z  
  } |:.Uw\z5'  
 } 5[4nFa}R:5  
 return bAdded; C ocw%Yl  
} VBw 5[  
t 7o4 aBl"  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ZO/u3&gU  
{ e([>sAx!1  
 BOOL bRemoved=FALSE; ([}08OW@  
 for(int index=0;index<MAX_KEY;index++){ fGqX dlP  
  if(hCallWnd[index]==hWnd){ "qd|!:bE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ YB<nz<;JR  
    hCallWnd[index]=NULL; {u2Zl7]z^  
    HotKey[index]=0; j7lJ7BIr  
    HotKeyMask[index]=0; %y|pVN!U  
    bRemoved=TRUE; x^EW'-a  
    KeyCount--; \"))P1  
    break; *YL86R+U  
   } @c'iT20  
  } &)gc{(4$  
 } yCav;ZS_  
 return bRemoved; oBo*<6  
} ENIg_s4  
)#cZ& O  
void VerifyWindow() #v<`|_  
{ Q;w [o  
 for(int i=0;i<MAX_KEY;i++){ h7^&:  
  if(hCallWnd!=NULL){ R54ae:8  
   if(!IsWindow(hCallWnd)){ lnHY?y7{  
    hCallWnd=NULL; _:=\h5}8  
    HotKey=0; #dL,d6a  
    HotKeyMask=0; ^4+NPk  
    KeyCount--; GDSXBa*7  
   } A,~KrRd  
  } $rmxwxz&W:  
 } &:&l+  
} R20 .dA_N  
I`X!M!dB)  
BOOL CHookApp::InitInstance() #e-K It  
{ i.uyfV&F  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ">CRFee0  
 hins=AfxGetInstanceHandle(); zKGZg>q  
 InitHotkey(); ''@Tke3IG6  
 return CWinApp::InitInstance(); P dqvXc  
} hmGlGc,lf  
'`2'<^yO  
int CHookApp::ExitInstance() cB){b'WJ  
{ |ugdl|f  
 VerifyWindow(); d{JI] !  
 UnInit(); Ja:4EU$Lu  
 return CWinApp::ExitInstance(); JX&]>#6|E  
} JxtzI2  
4 H0rS'5d  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file @I?,!3`jS  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) '1LN)Yw  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ wg%Z  
#if _MSC_VER > 1000 ^UJIDg7zS  
#pragma once xOKJOl  
#endif // _MSC_VER > 1000 Z9$pY=8^?  
@2hhBW  
class CCaptureDlg : public CDialog W9Azp8)p]  
{ lf>d{zd5  
 // Construction 9e K~g0m  
 public: aOGoJCt C  
  BOOL bTray; p-{ 4 $W  
  BOOL bRegistered; d9:I.SA)E  
  BOOL RegisterHotkey(); dY&v(~&;]  
  UCHAR cKey; H 4 ELIF#@  
  UCHAR cMask; jyW={%&  
  void DeleteIcon(); yKl^-%Uq<  
  void AddIcon(); /)J]ItJlz  
  UINT nCount; O U7OX]h  
  void SaveBmp(); J{dO0!7y  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 9 nc_$H{  
  // Dialog Data t;VMtIW+E  
  //{{AFX_DATA(CCaptureDlg) xIm2t~io  
  enum { IDD = IDD_CAPTURE_DIALOG }; X,l7>>L{g  
  CComboBox m_Key; =@M9S  
  BOOL m_bControl; `)y ;7%-  
  BOOL m_bAlt; |e@1@q(a[]  
  BOOL m_bShift; 6AJ`)8HX  
  CString m_Path; GBb8 }lx  
  CString m_Number; %/w-.?bX  
  //}}AFX_DATA eC"e v5v  
  // ClassWizard generated virtual function overrides ? bWc<]  
  //{{AFX_VIRTUAL(CCaptureDlg) yJC: bD1xi  
 public: 9D\E0YG X/  
  virtual BOOL PreTranslateMessage(MSG* pMsg); <tbs,lcw;  
 protected: /r'Fq =z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support n$SL"iezW?  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); vzI>:Bf  
  //}}AFX_VIRTUAL Ne|CWUhO  
  // Implementation h\@X!Z,  
 protected: 5 ,MM`:{{  
  HICON m_hIcon; <Nrtkf4-O  
  // Generated message map functions hk5!$#^  
  //{{AFX_MSG(CCaptureDlg) {= &&J@:  
  virtual BOOL OnInitDialog(); 83V\O_7j  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }|Q\@3&  
  afx_msg void OnPaint(); /7S g/d%c  
  afx_msg HCURSOR OnQueryDragIcon(); wS|k3^OV%  
  virtual void OnCancel(); U`~L}w"  
  afx_msg void OnAbout(); h~sTi  
  afx_msg void OnBrowse(); +pq=i  
  afx_msg void OnChange(); \Kui`X  
 //}}AFX_MSG V_$<^z|  
 DECLARE_MESSAGE_MAP() 4>d]0=x  
}; 09vVCM;DY  
#endif a+v.(mCG  
sSKD"  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file )UU`uzU;u  
#include "stdafx.h" B=W#eu <1  
#include "Capture.h" 3'L =S  
#include "CaptureDlg.h" :dipk,b?n  
#include <windowsx.h> mm#UaEp  
#pragma comment(lib,"hook.lib") |4/rVj"  
#ifdef _DEBUG :yJ#yad  
#define new DEBUG_NEW 3<)][<Ud  
#undef THIS_FILE (bI/s'?K  
static char THIS_FILE[] = __FILE__; w8q 2f-K-  
#endif F# 9^RA)9  
#define IDM_SHELL WM_USER+1 ZGh6- /  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;>ml@@Z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \>oy2{=;'  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; PyI"B96gz  
class CAboutDlg : public CDialog eW<NDI&b  
{ X*7VDt=  
 public: :/PxfN5  
  CAboutDlg(); _8PNMbv{  
  // Dialog Data 'tMD=MH  
  //{{AFX_DATA(CAboutDlg) mBye)q$  
  enum { IDD = IDD_ABOUTBOX }; @||nd,i`n~  
  //}}AFX_DATA P(b~3NB)  
  // ClassWizard generated virtual function overrides ;=P!fvHk  
  //{{AFX_VIRTUAL(CAboutDlg) (O!CH N!:  
 protected: 4!ZT_q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "tJ[M  
  //}}AFX_VIRTUAL @v&P;=lU  
  // Implementation iSOyp\E|  
 protected: 5(1c?biP&  
  //{{AFX_MSG(CAboutDlg) >*B59+1P  
  //}}AFX_MSG p/LV^TQ  
  DECLARE_MESSAGE_MAP() 8yOhKEPX  
}; ZjY?T)WE9  
XLYGhM  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) -+2A@kmEJ  
{ rR{KnM  
 //{{AFX_DATA_INIT(CAboutDlg) /`#JM  
 //}}AFX_DATA_INIT 'O2/PU2_  
} yZoJD{'?Sw  
;U a48pSv  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) &Vpr[S@:{  
{ iN0'/)ar  
 CDialog::DoDataExchange(pDX); 7#Fcn  
 //{{AFX_DATA_MAP(CAboutDlg)  ]sP  
 //}}AFX_DATA_MAP iW9  
} 5L7 nEia'  
q JtLJ<=1  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Ed_Fx'  
 //{{AFX_MSG_MAP(CAboutDlg) t1yfSStp  
 // No message handlers 77+3CME{'  
 //}}AFX_MSG_MAP uB6Mj dp6  
END_MESSAGE_MAP() ^rY18?XC+:  
K0I.3| 6C  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Ne3YhCC>  
: CDialog(CCaptureDlg::IDD, pParent) @a=jSB#B  
{ #Lk~{  
 //{{AFX_DATA_INIT(CCaptureDlg) 8NNs_~+x}  
  m_bControl = FALSE; 5vS[{;<&  
  m_bAlt = FALSE; qf@P9M  
  m_bShift = FALSE; Bk5 ELf8pL  
  m_Path = _T("c:\\"); S|6i]/  
  m_Number = _T("0 picture captured."); xj AU Csq  
  nCount=0; /Q89y[  
  bRegistered=FALSE; ru1^. (W2  
  bTray=FALSE; [P}mDX  
 //}}AFX_DATA_INIT 7&]|c?([4  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 S {+Z.P  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); el2<W=^M  
} &U([Wd?E2  
rmWs o b  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) CQ{{J{pU"  
{ Vvfd?G"  
 CDialog::DoDataExchange(pDX); 68<W6z  
 //{{AFX_DATA_MAP(CCaptureDlg) _sL;E<)y(  
  DDX_Control(pDX, IDC_KEY, m_Key); U(OkTJxv+  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); tt6GtYrC 1  
  DDX_Check(pDX, IDC_ALT, m_bAlt); +nB0O/m'U  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 7>0/$i#'Vl  
  DDX_Text(pDX, IDC_PATH, m_Path); x]R0zol  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ]!jfrj  
 //}}AFX_DATA_MAP {(t R<z)  
} /9Qr1@&v  
FGm!|iI  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ) jM-5}"  
//{{AFX_MSG_MAP(CCaptureDlg) Rz&}e@stl  
 ON_WM_SYSCOMMAND() -Oz! GX  
 ON_WM_PAINT() >'WTVj`  
 ON_WM_QUERYDRAGICON() xwHE,ykE  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) c7WOcy@M  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ,":_CY4(  
 ON_BN_CLICKED(ID_CHANGE, OnChange) #i*PwgC%_  
//}}AFX_MSG_MAP \O,yWyU4  
END_MESSAGE_MAP() Z0XQ|gkH  
~RBa&Y=Mb  
BOOL CCaptureDlg::OnInitDialog() ]ab q$Y'  
{ W+4Bx=Mj  
 CDialog::OnInitDialog(); Tfv @oPu  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); n!Y}D:6c6  
 ASSERT(IDM_ABOUTBOX < 0xF000); $ )2zz>4  
 CMenu* pSysMenu = GetSystemMenu(FALSE); SD@ 0X[  
 if (pSysMenu != NULL) ?=-/5A4K  
 { y4=T0[ V  
  CString strAboutMenu; F8/n;  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Qs8yJH`v  
  if (!strAboutMenu.IsEmpty()) @$%.iQ7A;  
  { yOP$~L#TWs  
   pSysMenu->AppendMenu(MF_SEPARATOR); 0&\71txrzg  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); DPmY_[OAE  
  } .vi0DuD6  
 } ^4Se=Hr z2  
 SetIcon(m_hIcon, TRUE); // Set big icon qa8?bNd'f  
 SetIcon(m_hIcon, FALSE); // Set small icon fgF@ x  
 m_Key.SetCurSel(0); /V] i3ac  
 RegisterHotkey(); p=i6~   
 CMenu* pMenu=GetSystemMenu(FALSE); Xw|-v$'y  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _,e4?grP#  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Z}SqiT  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); o,0 Z^"|  
 return TRUE; // return TRUE unless you set the focus to a control _oefp*iWS  
} 7,uD7R_  
[;:ocy  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) CkV -L4Jq  
{ NH=@[t) P,  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) iex]J@=e  
 { {FILt3f;  
  CAboutDlg dlgAbout; * {p:C  
  dlgAbout.DoModal(); N6A|  
 } xnw'&E  
 else 2<'ol65/c  
 { :eevc7  
  CDialog::OnSysCommand(nID, lParam); :RBeq,QaO  
 }  >Af0S;S  
} OKu~Nb*  
Z\n^m^Z =  
void CCaptureDlg::OnPaint() qn}VW0!  
{ iVmy|ewd  
 if (IsIconic()) wCj)@3F  
 { hwi_=-SL  
  CPaintDC dc(this); // device context for painting pm[i#V<v  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 66_=bd(9  
  // Center icon in client rectangle |X6R 2I  
  int cxIcon = GetSystemMetrics(SM_CXICON); iorQ/(  
  int cyIcon = GetSystemMetrics(SM_CYICON); <KoOJMx(  
  CRect rect; [W3sveqj&  
  GetClientRect(&rect); e$rPXRf  
  int x = (rect.Width() - cxIcon + 1) / 2; T+%P+  
  int y = (rect.Height() - cyIcon + 1) / 2; #)S&Z><<  
  // Draw the icon 7lwFxP5QT  
  dc.DrawIcon(x, y, m_hIcon); ) <w`:wD  
 } U5?QneK  
 else t23W=U  
 { ^L.'At  
  CDialog::OnPaint(); cveQ6 -`K  
 } ?k^m|Z  
} :}gEt?TUhs  
ZcTjOy?  
HCURSOR CCaptureDlg::OnQueryDragIcon() Ahr  
{ h b}QtQ  
 return (HCURSOR) m_hIcon; xv%]g= Q  
} iYlkc  
:<5jlpV(  
void CCaptureDlg::OnCancel() <HpUP!q8v  
{ Ufor>  
 if(bTray) t"MrrK>T  
  DeleteIcon(); ;Uy}(  
  CDialog::OnCancel(); r-]%R:U*  
} n(SeJk%>9  
zzd PR}VG  
void CCaptureDlg::OnAbout() um( xZ6&m  
{ wuSotbc/  
 CAboutDlg dlg; 'UuHyC2Ha3  
 dlg.DoModal(); IQ xi@7%&  
} D )Jac@,0  
<P]%{msGH  
void CCaptureDlg::OnBrowse() O+[s4]  
{ 4#ikdjB;  
 CString str; }` <D KO/  
 BROWSEINFO bi; )YwLj&e4tf  
 char name[MAX_PATH]; oP:R1<  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); `9\^.g)  
 bi.hwndOwner=GetSafeHwnd(); ]bstkf}~u  
 bi.pszDisplayName=name; 7fl{<uf  
 bi.lpszTitle="Select folder"; LIyb+rH#yg  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; $IdU  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); eIhfhz?Q;#  
 if(idl==NULL) "/3YV%to-#  
  return; {)Shc;Qh  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); jQBn\^w  
 str.ReleaseBuffer(); HLc3KYIk  
 m_Path=str;  <$K7f  
 if(str.GetAt(str.GetLength()-1)!='\\') f=8{cK0j  
  m_Path+="\\"; 4VC8#x1  
 UpdateData(FALSE); rQ&XHG>Q*  
} W?[ C au-  
l?Ls=J*  
void CCaptureDlg::SaveBmp() E, oR.B  
{ ,VzbKx,  
 CDC dc; gebL6oc%  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 0E{DO<~  
 CBitmap bm; s'Qmr s a  
 int Width=GetSystemMetrics(SM_CXSCREEN); :H:+XIgoR  
 int Height=GetSystemMetrics(SM_CYSCREEN); -e0?1.A$  
 bm.CreateCompatibleBitmap(&dc,Width,Height); WKwYSbs(  
 CDC tdc; 3|EAOoWnK  
 tdc.CreateCompatibleDC(&dc); NR%_&%qQA  
 CBitmap*pOld=tdc.SelectObject(&bm); S/YHT)0x[  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2NB $(4/  
 tdc.SelectObject(pOld); 8CH9&N5W5t  
 BITMAP btm; 6#a82_  
 bm.GetBitmap(&btm); C+dz0u3s  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 'X ?Iho  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); :dxKcg7  
 BITMAPINFOHEADER bih; 8;,|z%rS"  
 bih.biBitCount=btm.bmBitsPixel; X `F>kp1  
 bih.biClrImportant=0; 1Cw$^jd  
 bih.biClrUsed=0; q &S@\b  
 bih.biCompression=0; O.-A)S@  
 bih.biHeight=btm.bmHeight; kX)*:~*  
 bih.biPlanes=1; 0+.<BOcW5  
 bih.biSize=sizeof(BITMAPINFOHEADER); Xc~BHEp  
 bih.biSizeImage=size; n_wF_K\h  
 bih.biWidth=btm.bmWidth; 7c6- o"A  
 bih.biXPelsPerMeter=0; )lJi7 ^,  
 bih.biYPelsPerMeter=0; ]c]^(C  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3/]~#y%2  
 static int filecount=0; _p^Wc.[~M  
 CString name; 8m[o*E.4F  
 name.Format("pict%04d.bmp",filecount++); ]]y,FQ,r  
 name=m_Path+name; _ G2)=yj]  
 BITMAPFILEHEADER bfh; xP27j_*m>  
 bfh.bfReserved1=bfh.bfReserved2=0; $-s8tc(  
 bfh.bfType=((WORD)('M'<< 8)|'B'); /wkrfYRs  
 bfh.bfSize=54+size; MIN}5kc<  
 bfh.bfOffBits=54; O:imX>|u  
 CFile bf; a^Q ?K\c4N  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .*z$vl  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); \c!e_rZ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); RPjw12Ly  
  bf.WriteHuge(lpData,size); EZT 8^m  
  bf.Close(); $ % B  
  nCount++; C]h_co2eI  
 } :lK8i{o  
 GlobalFreePtr(lpData); Mq#Hi9SKY  
 if(nCount==1) .LbAR u  
  m_Number.Format("%d picture captured.",nCount); (Bv~6tj~J  
 else gtqtFrleG  
  m_Number.Format("%d pictures captured.",nCount); S@TfZ3Go|  
  UpdateData(FALSE); ~&"'>C#  
} H wz$zF+R  
bkrl>Im<n  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) B$7Cjv  
{ @xk;]H80  
 if(pMsg -> message == WM_KEYDOWN) t[AA=  
 { .z*}%,G  
  if(pMsg -> wParam == VK_ESCAPE) 0WyOORuK  
   return TRUE; u<+"#.[2v~  
  if(pMsg -> wParam == VK_RETURN) i<q_d7-W'  
   return TRUE; /_yAd,^-+  
 } h<n2pz}  
 return CDialog::PreTranslateMessage(pMsg); kUr/*an  
} R38 \&F  
Yjl:i*u/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 8A u W>7_  
{ |;I"Oc.w^R  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ yQ&C]{>TS  
  SaveBmp(); Ht@5@(W]I  
  return FALSE; *qxv"PptX  
} W*,$0 t  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 0_=^#r4Mu  
 CMenu pop; 3T[zieX  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;q#Pl!*5  
 CMenu*pMenu=pop.GetSubMenu(0); _ D"S  
 pMenu->SetDefaultItem(ID_EXITICON); Vl'rO_?t  
 CPoint pt; /J(~NGT  
 GetCursorPos(&pt); ;1>V7+/  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ZmJ<FF4  
 if(id==ID_EXITICON) i@ 86Ez  
  DeleteIcon(); D r"PS >.  
 else if(id==ID_EXIT) 6_:KFqc W  
  OnCancel(); w{4#Q[  
 return FALSE; iRM ?_|  
} &v feBth  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ?=HoU3  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) J0o,ZH9  
 AddIcon(); p4 $4;)  
 return res; `7.$ A U  
} ij.NSyk9  
Z2-"NB  
void CCaptureDlg::AddIcon() Fc|N6I'o  
{ #eF k  
 NOTIFYICONDATA data; #T8PgmR  
 data.cbSize=sizeof(NOTIFYICONDATA); `3z6y& dmx  
 CString tip; ]?NiY:v  
 tip.LoadString(IDS_ICONTIP);  xS="o  
 data.hIcon=GetIcon(0); G'wyH[ d/  
 data.hWnd=GetSafeHwnd(); $J0o%9K   
 strcpy(data.szTip,tip); !LsIHDs4  
 data.uCallbackMessage=IDM_SHELL; R~;8v1>K  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; PtGFLM9R  
 data.uID=98; ke)<E98DC  
 Shell_NotifyIcon(NIM_ADD,&data); ,pUB[w\  
 ShowWindow(SW_HIDE); }*vE/W  
 bTray=TRUE; +,)Iv_Xl$  
} t"5ZYa  
R?Ch8mW.!  
void CCaptureDlg::DeleteIcon() };f^*KZ=0  
{ Kp!A ay  
 NOTIFYICONDATA data; ]H<}6}Gd  
 data.cbSize=sizeof(NOTIFYICONDATA); V|/N-3M  
 data.hWnd=GetSafeHwnd(); ?.c:k;j  
 data.uID=98; 6w_TL< S  
 Shell_NotifyIcon(NIM_DELETE,&data); =%B}8$.|  
 ShowWindow(SW_SHOW); *o<|^,R  
 SetForegroundWindow(); O>9-iqP>`d  
 ShowWindow(SW_SHOWNORMAL); M} +s_h9  
 bTray=FALSE; 2;w> w#}>  
} iT+t  
rmdg~  
void CCaptureDlg::OnChange() fVi[mH0=+  
{ 48{B}j%oU  
 RegisterHotkey(); X9C:AGbp  
} y!|4]/G]?t  
+=*ND<$n/E  
BOOL CCaptureDlg::RegisterHotkey() //bQD>NBO  
{ Fw^^sB  
 UpdateData(); ={jj'X9  
 UCHAR mask=0; KbH|'/w  
 UCHAR key=0; []?*}o5&>T  
 if(m_bControl) /74)c~.W  
  mask|=4; Gsz$H_  
 if(m_bAlt) ]}.|b6\  
  mask|=2; ^Of\l:q*  
 if(m_bShift) g``S SU  
  mask|=1; 'vKae  
  key=Key_Table[m_Key.GetCurSel()]; Bm6t f}8  
 if(bRegistered){ Vw`%|x"Xz  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); th5UzpB4  
  bRegistered=FALSE; *r|1 3|k  
 } #fXy4iL l  
 cMask=mask; q3|SZoN  
 cKey=key; SjcX|=S  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ;R3o$ZlY  
 return bRegistered; "kKIv|`  
} tv; ?W=&P  
2/x~w~3U  
  四、小结 Z`n "}{  
^}<]sjmk  
  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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