社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 5201阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 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: el5Pe{j '  
  %!Eh9C*  
  一、实现方法 jGo%Aase  
ZVH 9je  
  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: )x\%*ewY  
Xk|a%%O*H  
#pragma data_seg("shareddata") i/_rz.c~3  
HHOOK hHook =NULL; //钩子句柄 Wtu-g**KN  
UINT nHookCount =0; //挂接的程序数目 9{fP.ifdv7  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 TW& s c9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @ xo8"kl  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey W gyRK2#!  
static int KeyCount =0; `?=3[  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 A nl1+  
#pragma data_seg() ]*a(^*}A%  
axC{azo|  
  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。 }\<=B%{  
*3Lo[GE>  
  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: ;q-c[TZC  
-5og)ZGVUA  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ^jL)<y4`  
cKey,UCHAR cMask) ?qsLR  
{ 46T(1_Xt~  
 BOOL bAdded=FALSE; y g(Na  
 for(int index=0;index<MAX_KEY;index++){ Ynf "g#(  
  if(hCallWnd[index]==0){ }Jh.+k|_  
   hCallWnd[index]=hWnd; aK6dy\  
   HotKey[index]=cKey; XixjdBFP  
   HotKeyMask[index]=cMask; am/}V%^  
   bAdded=TRUE; .a2R2~35  
   KeyCount++; (^B1Kt!<  
   break; prS%lg>  
  } e^q^ AP+*  
 } Pn4.gabE  
 return bAdded; z@IG"D  
} 2*`kkS  
//删除热键 P51cEhf  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) r|}Pg}O  
{ 7<70\ 6  
 BOOL bRemoved=FALSE; 5,XEN$^  
 for(int index=0;index<MAX_KEY;index++){ *.w6 =}  
  if(hCallWnd[index]==hWnd){ a+z>pV|  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p\_3g!G'  
    hCallWnd[index]=NULL; 2|ee`"`  
    HotKey[index]=0; X n0HJ^"_  
    HotKeyMask[index]=0; xp:I(  
    bRemoved=TRUE; |+8rYIms`  
    KeyCount--; V8F! o  
    break; Oq<3&*  
   } ]EF"QLNN(  
  } 'uz o[>p  
 } R $<{"b  
 return bRemoved; *fi`DiO  
} ,.{M1D6'R`  
dAG@'A\f  
a{7*um  
  DLL中的钩子函数如下: tC1'IE-h  
4 w*m]D{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }L Q%%  
{ mgjcA5z  
 BOOL bProcessed=FALSE; fGj66rMGw  
 if(HC_ACTION==nCode) Se[=$W  
 { F6CuY$0m=  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 D`41\#ti  
   switch(wParam) aC9iNm8w  
   {  *cFGDQ !  
    case VK_MENU: P)y2'JKL  
     MaskBits&=~ALTBIT; }duqX R  
     break; arKf9`9  
    case VK_CONTROL: ^`xS| Sq1D  
     MaskBits&=~CTRLBIT; ]D@aMC$#  
     break; o}waJN`yI  
    case VK_SHIFT: 2@_3V_  
     MaskBits&=~SHIFTBIT; vbd ;Je"  
     break; nY;Sk#9  
    default: //judge the key and send message \s8h.xjU  
     break; pT+OPOSR  
   } 4avkyFj!h  
   for(int index=0;index<MAX_KEY;index++){ '9vsv\A&  
    if(hCallWnd[index]==NULL) B;Z _'.i,d  
     continue; 1HSt}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xK[ [b  
    { \g]rOYW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 3k_\ xQ  
     bProcessed=TRUE; ffB<qf)?G  
    } d/TFx  
   } 9gK1Gx:  
  }  ]E :L  
  else if((lParam&0xc000ffff)==1){ //有键按下 "6WJj3h N  
   switch(wParam) }n^}%GB  
   { _,F\%}  
    case VK_MENU: @ajdO/?(Y  
     MaskBits|=ALTBIT; b-`P-  
     break; ;gaTSYVe  
    case VK_CONTROL: -1d$w`  
     MaskBits|=CTRLBIT; ={h^X0<s9  
     break; CO ZfR~}  
    case VK_SHIFT: JeVbFZ8  
     MaskBits|=SHIFTBIT; _^eA1}3  
     break; PCDvEbpG  
    default: //judge the key and send message nF3Sfw,  
     break; hn6'$P  
   } IO?a.L:6U  
   for(int index=0;index<MAX_KEY;index++){ g~|x^d^;|  
    if(hCallWnd[index]==NULL) =<M>fJ)  
     continue; vcy(!r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bjj F{T  
    { =RWY0|f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); DKlHXEt>  
     bProcessed=TRUE; 9*"K+t:  
    } Q.8^F  
   } tg%<@U`7=  
  } | Cfo(]>G  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 S._h->5f  
   for(int index=0;index<MAX_KEY;index++){ HF&d HD2f  
    if(hCallWnd[index]==NULL) [;toumv  
     continue; (Ze\<Y#cv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 02^\np  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Zia6m[^Q  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ex|)3|J  
   } _{B2z[G}  
  } v+C D{Tc  
 } NXOvC!<  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); e \kR/<L  
} g*9&3ov  
w3>G3=b  
  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: f4X}F|!h  
?q'r9Ehe  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Xn!=/<TIVz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &$qIJvMiK  
]/R>nT  
  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: ]YD qmIW  
"tK3h3/Xv  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) La^Zr,T!  
{ f|!@H><  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) {qry2ZT5  
 { Jju?v2y`  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 5(\[Gke  
  SaveBmp(); lm'.G99{  
  return FALSE; ?K.!^G  
 } 1Ji"z>H*  
 …… //其它处理及默认处理 at3YL[,[Z  
} #TP Y%  
G0r(xP?  
eLyIQoW  
  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。 ybB<AkYc  
;ov}%t>UD  
  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。 }u5J<*:bZ  
7w0=i Z>K  
  二、编程步骤 .= 8Es#  
!\&4,l(  
  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"; H/G;hk  
z8};(I>)  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; i)ibDrX!I  
J2`OJsMwWe  
  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; +A_jm!tJS(  
1@<>GDB9  
  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; .9!&x0;  
*EtC4sP  
  5、 添加代码,编译运行程序。 6>EoU-YX}l  
=\<!kJ\yH  
三、程序代码 OBPiLCq  
*41WZE  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5bWy=Xk B  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 1T3YFt@&I  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ XoiZ"zE  
#if _MSC_VER > 1000 nm,Tng oj  
#pragma once AkqGk5e ^  
#endif // _MSC_VER > 1000  & *&  
#ifndef __AFXWIN_H__ 'Cywn^Ym#  
#error include 'stdafx.h' before including this file for PCH TF,a `?c`  
#endif JnH5v(/  
#include "resource.h" // main symbols l)0yv2[h  
class CHookApp : public CWinApp Xb*>7U/'T  
{ lU3Xd_v O  
 public: dnX^?  
  CHookApp(); ui^v.YCMI  
  // Overrides *\wf(o>Q  
  // ClassWizard generated virtual function overrides X`daaG_l  
  //{{AFX_VIRTUAL(CHookApp) "w{,ndZ  
 public: `udZ =S"/L  
  virtual BOOL InitInstance(); ZW8;?# _  
  virtual int ExitInstance(); DZ;2aH  
  //}}AFX_VIRTUAL (WS<6j[q  
  //{{AFX_MSG(CHookApp) 'seuO!5  
  // NOTE - the ClassWizard will add and remove member functions here. -(.\> F  
  // DO NOT EDIT what you see in these blocks of generated code ! -_Iuvw  
  //}}AFX_MSG iw EHEi%  
  DECLARE_MESSAGE_MAP() YpbJoHiSH  
}; 7o M]qLF  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); EY!P"u;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $%J $  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $Jj0%?;  
BOOL InitHotkey(); }Qvoms<k  
BOOL UnInit(); E{|n\|  
#endif mZ t:  
X1h*.reFAL  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 3qH`zYgh  
#include "stdafx.h" `?Xt ,  
#include "hook.h" %O&C\{J  
#include <windowsx.h> p$%g$K  
#ifdef _DEBUG  PYYO-Twg  
#define new DEBUG_NEW 12%4>2}~>  
#undef THIS_FILE - e"XEot~  
static char THIS_FILE[] = __FILE__; 1HNX 6  
#endif ,}42]%$ G  
#define MAX_KEY 100 9]/j u  
#define CTRLBIT 0x04 W.U|mNJ$  
#define ALTBIT 0x02 r;aP`MVO<  
#define SHIFTBIT 0x01 &@xeWB  
#pragma data_seg("shareddata") vui{["  
HHOOK hHook =NULL; Sst`*PX:  
UINT nHookCount =0; l{x?i00tAS  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey m4@w M?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT d "vd_}P~  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ('px X+  
static int KeyCount =0; pDx}~IB  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Kx[z7]1@  
#pragma data_seg() -[`FNTTV C  
HINSTANCE hins; Aonq;} V e  
void VerifyWindow(); cYEe`?*  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ud.Bzg:/  
//{{AFX_MSG_MAP(CHookApp) 3#T_(  
// NOTE - the ClassWizard will add and remove mapping macros here. V 5ihplAk  
// DO NOT EDIT what you see in these blocks of generated code! OKq={l  
//}}AFX_MSG_MAP Y_Lsmq2!  
END_MESSAGE_MAP() gb0ZGnI  
OECXNx  
CHookApp::CHookApp() '}wYSG-  
{ =8fZG t  
 // TODO: add construction code here, D+  **o  
 // Place all significant initialization in InitInstance QWGFXy,=1  
} !bCLi>8  
gBG.3\[  
CHookApp theApp; S\UM0G}v  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +nslS:(  
{ +#<"o#gZ  
 BOOL bProcessed=FALSE; RsDI7v  
 if(HC_ACTION==nCode) #8d$%F))  
 { ;EfMTI}6K  
  if((lParam&0xc0000000)==0xc0000000){// Key up KPA5 X]  
   switch(wParam) b511qc"i>M  
   { 57b;{kl  
    case VK_MENU: N6<23kYM  
     MaskBits&=~ALTBIT; xX.Ox  
     break; Mhw\i&*U  
    case VK_CONTROL: 8Lpy`He  
     MaskBits&=~CTRLBIT; bqg\V8h  
     break; {#y HL  
    case VK_SHIFT: ]H|1q uT  
     MaskBits&=~SHIFTBIT; E|.D  
     break; | Y1<P^  
    default: //judge the key and send message ;3_Q7;y  
     break; <!|2Ru  
   } G:rM_q9\u  
   for(int index=0;index<MAX_KEY;index++){ 6l$o^R^D  
    if(hCallWnd[index]==NULL) P5P<-T{-c  
     continue; n1W}h@>8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :r/rByd'  
    { *lG$B@;rc|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); HnqZ7%jeN  
     bProcessed=TRUE; U-s6h;^ O  
    } 3^us;aOr  
   } f i!wrvO  
  } o&~z8/?LA  
  else if((lParam&0xc000ffff)==1){ //Key down (Qq$ql27  
   switch(wParam) Q\:'gx8`  
   { tIC_/ 6  
    case VK_MENU: q& Vt*  
     MaskBits|=ALTBIT; Yazpfw 7'd  
     break; 3r{'@Y =)Y  
    case VK_CONTROL: es(vWf'  
     MaskBits|=CTRLBIT; ZdH WSfO)O  
     break; 5y"yd6O]O5  
    case VK_SHIFT: "v3u$-xN1  
     MaskBits|=SHIFTBIT; aV(*BE/@F  
     break; O'-lBf+<  
    default: //judge the key and send message 1|cmmUM-'v  
     break; <STjB,_s  
   } CsR~qQ 5  
   for(int index=0;index<MAX_KEY;index++) uYMW5k_,>  
   { ^J~}KOH  
    if(hCallWnd[index]==NULL) .[Sv|;x"E  
     continue; *<#&ne 8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a}c(#ZLs  
    { C>;yW7*g"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); r%'2a+}D  
     bProcessed=TRUE; &:jE+l  
    } nw5#/5xw  
   } t7A.b~#  
  } I"JT3[*s  
  if(!bProcessed){ :WCUHQ+  
   for(int index=0;index<MAX_KEY;index++){ w-CuO4P  
    if(hCallWnd[index]==NULL) y_QxJ~6t  
     continue; 1=(i{D~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |$b4 {  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); C.(ZXU7  
   } h=4{.EegG&  
  } 9Jk(ID'c  
 } iQGoy@<R  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "3j0)  
} G:e}>'  
{@ , L  
BOOL InitHotkey() @,aL'2G  
{ $~~=SOd0  
 if(hHook!=NULL){ >v<}$v6D~  
  nHookCount++; ,.}PZL  
  return TRUE; a* IJ)'S  
 } G(0 bulq  
 else j^!J: Bj  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); _Wb-&6{  
  if(hHook!=NULL) v*BA\&  
   nHookCount++; P7y[9|^  
  return (hHook!=NULL); %""CacX  
} 0`ib_&yI  
BOOL UnInit() X}usyO'pW  
{ 7_Q86o  
 if(nHookCount>1){ FUcs=7c  
  nHookCount--; v}Aw!Dv/  
  return TRUE; @i)tQd!s  
 } 1k/l7&n"  
 BOOL unhooked = UnhookWindowsHookEx(hHook); x)* /3[  
 if(unhooked==TRUE){ vp_$6  
  nHookCount=0; M K[spV  
  hHook=NULL; =0]Mc$Ih  
 } [ $"iO#oO  
 return unhooked; bL[PNUG  
} Iw<c 9w8  
2\5@_U^)h  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) mmKrmM*1  
{ 25 ~$qY_  
 BOOL bAdded=FALSE; sw@2 ?+  
 for(int index=0;index<MAX_KEY;index++){  7:p]~eM)  
  if(hCallWnd[index]==0){ c,~44Z  
   hCallWnd[index]=hWnd; J/=A f [  
   HotKey[index]=cKey; m5x>._7le  
   HotKeyMask[index]=cMask; < NAR'{f  
   bAdded=TRUE; BA>0 +  
   KeyCount++; /1>  
   break; q,(&2./  
  } EqmJXDm  
 } bT*4Qd4W  
 return bAdded; nRE}F5k  
} 1aDDl-8,  
yR$_$N+E  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ( gFA? aD<  
{ &sNID4FR  
 BOOL bRemoved=FALSE; Vlz T  
 for(int index=0;index<MAX_KEY;index++){ `x#~ -  
  if(hCallWnd[index]==hWnd){ GSFT(XX  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ t/D Q<B_  
    hCallWnd[index]=NULL; 1*jL2P]D  
    HotKey[index]=0; :hr@>Y~r  
    HotKeyMask[index]=0; k2WO*xa*  
    bRemoved=TRUE; xXYens}  
    KeyCount--; B*AMo5  
    break; V$_0VN'+Z  
   } @ixX?N)V  
  } #<e7 Y0  
 } Rj&7|z  
 return bRemoved; bYgYP|@  
} %N  
H'`(|$:|  
void VerifyWindow() mT>p:G  
{ Zll^tF#  
 for(int i=0;i<MAX_KEY;i++){ zn x_p /V  
  if(hCallWnd!=NULL){ 0X-2).n u  
   if(!IsWindow(hCallWnd)){ \O?B9_  
    hCallWnd=NULL; stG&(M  
    HotKey=0; &sgwY  
    HotKeyMask=0; Tz-cN  
    KeyCount--; iQIw]*h^  
   } `;qZ$HH  
  } :&-}S>pC  
 } :Ir:OD# o  
} .:raeDrd  
IjRmpVcwN  
BOOL CHookApp::InitInstance() c+{4C3z  
{ K{ P#[X*5  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;X6y.1N~  
 hins=AfxGetInstanceHandle(); cs M|VNE>  
 InitHotkey(); S}f<@-16P  
 return CWinApp::InitInstance(); )89jP088V  
} 11T\2&Q  
A(p  
int CHookApp::ExitInstance() -8jqC6mQ  
{ \@3  
 VerifyWindow(); &NQR*Tn  
 UnInit(); eM"mP&TTL  
 return CWinApp::ExitInstance(); sN}@b8o@  
} W>bW1h  
kw~H%-,]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $Ig,cTR.b  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) S: uEK  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ SkA'+(  
#if _MSC_VER > 1000 XXcf!~uO  
#pragma once EXcjF  
#endif // _MSC_VER > 1000 FxX3Pq8h  
`VE&Obp[  
class CCaptureDlg : public CDialog P$ef,ZW"  
{ Hu7zmh5FF  
 // Construction [\ YP8^..  
 public: rM=A"  
  BOOL bTray; +|<&#b0Xd  
  BOOL bRegistered; aF"Z!HD  
  BOOL RegisterHotkey(); Hc%\9{zH  
  UCHAR cKey; =M#?*e  
  UCHAR cMask; I{I [N &N  
  void DeleteIcon(); J-<B*ot+lX  
  void AddIcon(); kw:D~E (  
  UINT nCount; j/pQSlV  
  void SaveBmp(); Le JlTWotC  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor f{c[_OR  
  // Dialog Data :*'?Ac ?  
  //{{AFX_DATA(CCaptureDlg) :+Ax3  
  enum { IDD = IDD_CAPTURE_DIALOG }; gtGKV  
  CComboBox m_Key; aQ:f"0fL  
  BOOL m_bControl; )o</gt)  
  BOOL m_bAlt; z 2VCK@0  
  BOOL m_bShift; 32LB*zc  
  CString m_Path; <&%1pZ/6.  
  CString m_Number; /j/%wT2m  
  //}}AFX_DATA y]_8. 0zM  
  // ClassWizard generated virtual function overrides k1U8wdoT  
  //{{AFX_VIRTUAL(CCaptureDlg) }a1Sfl@`3  
 public: ASa!yV=g  
  virtual BOOL PreTranslateMessage(MSG* pMsg); aZ>\*1   
 protected: i!oj&&  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dKQV4dc>  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?67I|@^  
  //}}AFX_VIRTUAL DjzBG*f/  
  // Implementation \g1@A"  
 protected: r{R7"  
  HICON m_hIcon; PZ(<eJ>  
  // Generated message map functions {ah~q}(P  
  //{{AFX_MSG(CCaptureDlg) uEGPgYY(  
  virtual BOOL OnInitDialog(); GR[>mkW!M  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ^MHn2Cv/~  
  afx_msg void OnPaint(); G=5t5[KC  
  afx_msg HCURSOR OnQueryDragIcon(); +Z<Q^5w@  
  virtual void OnCancel(); j~*Z7iu  
  afx_msg void OnAbout(); e=z_+gVm  
  afx_msg void OnBrowse(); <4e*3WSG  
  afx_msg void OnChange(); kok^4VV  
 //}}AFX_MSG H"rzRd; S  
 DECLARE_MESSAGE_MAP() /+t[,  
}; UZ\*]mxT  
#endif kF,\bM  
`-EH0'w~"  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file H..ZvGu  
#include "stdafx.h" ,Zf!KQw  
#include "Capture.h" J-\?,4mcP  
#include "CaptureDlg.h" niHL/\7u  
#include <windowsx.h> jJ"EGFa8  
#pragma comment(lib,"hook.lib") s P4 ,S(+e  
#ifdef _DEBUG jc.JX_/  
#define new DEBUG_NEW zMYd|2bc  
#undef THIS_FILE "I}Z2  
static char THIS_FILE[] = __FILE__; l5Wa'~0qA  
#endif ?5v5:U(A  
#define IDM_SHELL WM_USER+1 {I-a;XBX  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mHEf-6|C`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7 Jx-W|  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; C{hcK 1-K  
class CAboutDlg : public CDialog M 1^C8cz  
{ soq".+Q  
 public: %L13Jsw  
  CAboutDlg(); l \^nC2  
  // Dialog Data <VaMUm<2  
  //{{AFX_DATA(CAboutDlg) %|(?!w7  
  enum { IDD = IDD_ABOUTBOX }; C9F+e  
  //}}AFX_DATA N.{jM[\F  
  // ClassWizard generated virtual function overrides 5nx<,-N*BP  
  //{{AFX_VIRTUAL(CAboutDlg) Az< 9hk  
 protected: yD"0=\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2>}\XKF).  
  //}}AFX_VIRTUAL xOL)Pjo /m  
  // Implementation 8q?;Hg  
 protected: x]R(twi  
  //{{AFX_MSG(CAboutDlg) T6I%FXm}  
  //}}AFX_MSG 4,U}Am1Q  
  DECLARE_MESSAGE_MAP() /Fo/_=FE2  
}; N~$Zeq=  
~kYqGH  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 2yQ}Lxr(  
{ y2#>c*  
 //{{AFX_DATA_INIT(CAboutDlg) 7 ZL#f![{  
 //}}AFX_DATA_INIT {y^|ET7  
} )jk1S  
.FKJ yzL  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) W>0"CUp  
{ =`1m-   
 CDialog::DoDataExchange(pDX); 9vp%6[  
 //{{AFX_DATA_MAP(CAboutDlg) YXzZ-28,<  
 //}}AFX_DATA_MAP (}C^_q:7d  
} $,;S\JmWP  
Sc/`=h]T  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) :G`L3E&1s  
 //{{AFX_MSG_MAP(CAboutDlg) ^b"bRQqm  
 // No message handlers 1O9p YW5J  
 //}}AFX_MSG_MAP qqe2,X?  
END_MESSAGE_MAP() o3F|#op  
``|gcG  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) o'eI(@{F=  
: CDialog(CCaptureDlg::IDD, pParent) G;Wkm|  
{ $Pd|6  
 //{{AFX_DATA_INIT(CCaptureDlg) 9si}WqAw  
  m_bControl = FALSE;   ^RV  
  m_bAlt = FALSE; _3.G\/>[K  
  m_bShift = FALSE; p/hvQy E  
  m_Path = _T("c:\\"); |0L=8~M(j  
  m_Number = _T("0 picture captured."); e?!L}^f6X  
  nCount=0; w#xeua|*I#  
  bRegistered=FALSE; 7<3U?]0  
  bTray=FALSE; 7?MB8tJ5r4  
 //}}AFX_DATA_INIT 5c]}G.NV  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 /^'Bgnez  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); oSn! "<x  
} Q sg/ V]  
5 o#<`_=J  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {Z#e{~m#  
{ >I4p9y(u  
 CDialog::DoDataExchange(pDX); |.(CIu~b  
 //{{AFX_DATA_MAP(CCaptureDlg) 4bi NGl~  
  DDX_Control(pDX, IDC_KEY, m_Key); zj>aaY  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); [0&'cu>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); M@~~f   
  DDX_Check(pDX, IDC_SHIFT, m_bShift); _%'L@[ H  
  DDX_Text(pDX, IDC_PATH, m_Path); eyT>wma0  
  DDX_Text(pDX, IDC_NUMBER, m_Number); X>Al:?`}N  
 //}}AFX_DATA_MAP h(@R]GUX  
} <)O >MI' 4  
C,A!tj7@  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) &|.hkR2k  
//{{AFX_MSG_MAP(CCaptureDlg) E dn[cH7  
 ON_WM_SYSCOMMAND() yB,{#nM>8  
 ON_WM_PAINT() FxCZRo&  
 ON_WM_QUERYDRAGICON() 7v_i>_m]  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) JiFA]M`^Q  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) S \e& ?Y`  
 ON_BN_CLICKED(ID_CHANGE, OnChange) qKdS7SoS  
//}}AFX_MSG_MAP N0Efw$u  
END_MESSAGE_MAP() OM.k?1%+M  
p}3NJV  
BOOL CCaptureDlg::OnInitDialog() .xGo\aD  
{ e}42/>}#D  
 CDialog::OnInitDialog(); M{?.hq  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |h&<_9  
 ASSERT(IDM_ABOUTBOX < 0xF000); sM9FE{,mx  
 CMenu* pSysMenu = GetSystemMenu(FALSE); EntF@ln!  
 if (pSysMenu != NULL) :dP~.ZY7  
 { SY-ez 91  
  CString strAboutMenu; i;o}o *=  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Y[Q @WdE9  
  if (!strAboutMenu.IsEmpty()) _1^8xFe2  
  { mZ~qG5@/F  
   pSysMenu->AppendMenu(MF_SEPARATOR); }I]j&\  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); n /QfdAg  
  } q!6|lZB3  
 } &]P"48NT  
 SetIcon(m_hIcon, TRUE); // Set big icon nPcS3!7B#  
 SetIcon(m_hIcon, FALSE); // Set small icon 9W!8gCs  
 m_Key.SetCurSel(0); <B6[i*&  
 RegisterHotkey(); yu)q4C7ek  
 CMenu* pMenu=GetSystemMenu(FALSE); Q>.BQ;q]  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ^0^( u  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ,;_rIO"  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); egm)a   
 return TRUE; // return TRUE unless you set the focus to a control P|e`^Frxt  
} pDu{e>S|:  
*AZ?~ i^o  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) v`JF\"}S  
{ N.Dhu~V  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) *E:x E/M!2  
 { w |_GV}#_  
  CAboutDlg dlgAbout; \6sqyWI %  
  dlgAbout.DoModal(); zZ%DtxUoU.  
 } }A]BpSEP  
 else 5h0>!0  
 { (;a B!(_  
  CDialog::OnSysCommand(nID, lParam); nV}8M  
 } (}Sr08m  
} >$\Bu]{1  
z3a-+NjDm  
void CCaptureDlg::OnPaint() WsR+Np@c  
{ 4qhWm"&CM  
 if (IsIconic()) 5[C~wvO  
 { n`q2s'Pc  
  CPaintDC dc(this); // device context for painting rH&G<o&,  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); g\U/&.}DN  
  // Center icon in client rectangle 79ckLd9  
  int cxIcon = GetSystemMetrics(SM_CXICON); Sk:2+inU  
  int cyIcon = GetSystemMetrics(SM_CYICON); AoYaVlKG8  
  CRect rect; IdPn%)>6  
  GetClientRect(&rect); bd!U)b(}OV  
  int x = (rect.Width() - cxIcon + 1) / 2; Cq>6rn  
  int y = (rect.Height() - cyIcon + 1) / 2; fN-Gk(Ic  
  // Draw the icon -ynBi;nH  
  dc.DrawIcon(x, y, m_hIcon); 1dFa@<5  
 } V<8K@/n@  
 else 62[8xn=(%  
 { 740B\pc0  
  CDialog::OnPaint(); J~KX|QY.S  
 } 8eluO ?p  
} G"T\=cQz  
k=[pm5ZvT~  
HCURSOR CCaptureDlg::OnQueryDragIcon() 0GZq`a7[  
{ DAdYg0efex  
 return (HCURSOR) m_hIcon; M;+IZr Wkl  
} 4KXc~eF[M"  
XphE loL  
void CCaptureDlg::OnCancel() !:WW  
{ [4*1}}gW%5  
 if(bTray) BOvF)4`  
  DeleteIcon(); n9%]-s\Hn  
  CDialog::OnCancel(); 5t\HJ`C1Z  
} u%u&F^y  
_;hf<|c  
void CCaptureDlg::OnAbout() OfTfNhpK  
{ TBCp L]QT  
 CAboutDlg dlg; BcQEG *N  
 dlg.DoModal(); tx"LeZZ  
} gbDX7r-  
cWMUj K/N  
void CCaptureDlg::OnBrowse() yto[8;)_  
{ [:h5}  
 CString str; ;HNq>/{  
 BROWSEINFO bi; <8!  Tq  
 char name[MAX_PATH]; $7Z)Yp&T  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ,zhJY ?sk  
 bi.hwndOwner=GetSafeHwnd(); 2N5`'  
 bi.pszDisplayName=name; v4rW2F:X  
 bi.lpszTitle="Select folder"; {EA1vo"  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; x5h~G  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); }4&/VvN  
 if(idl==NULL) P(,?#+]-  
  return; w##^}nHOR  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); nirDMw[  
 str.ReleaseBuffer(); 1vnYogL   
 m_Path=str; , sjh^-;  
 if(str.GetAt(str.GetLength()-1)!='\\') Zd!U')5/  
  m_Path+="\\"; OcmRZ  
 UpdateData(FALSE); *27*>W1  
} }rq9I"/L  
?Q0I'RC  
void CCaptureDlg::SaveBmp() KkcXNjPVS  
{ *nC(-(r:J`  
 CDC dc; zF`3 gl.  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); rf.`h{!!  
 CBitmap bm; 8)L*AdDAW!  
 int Width=GetSystemMetrics(SM_CXSCREEN); WBr59@V  
 int Height=GetSystemMetrics(SM_CYSCREEN); :g6n,p_#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); jZteooJG|  
 CDC tdc; 7B7&9<gc  
 tdc.CreateCompatibleDC(&dc); w(9*7pp  
 CBitmap*pOld=tdc.SelectObject(&bm); ",yc0 2<  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); `JB?c  
 tdc.SelectObject(pOld); a0=WfeT  
 BITMAP btm; T 2F6)e  
 bm.GetBitmap(&btm); ,WD X(  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; nhT-Ido  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); v+G=E2Lhv  
 BITMAPINFOHEADER bih; y7/F _{  
 bih.biBitCount=btm.bmBitsPixel; j$Ab>}g]  
 bih.biClrImportant=0; 0hY{<^"Y  
 bih.biClrUsed=0; k&/OU:7Y  
 bih.biCompression=0; -0Cnp/Yj@  
 bih.biHeight=btm.bmHeight; t `kui.  
 bih.biPlanes=1; g%nl!dgS  
 bih.biSize=sizeof(BITMAPINFOHEADER); h6~$/`&]b  
 bih.biSizeImage=size; _n;;][]S  
 bih.biWidth=btm.bmWidth; bQ'8SCe  
 bih.biXPelsPerMeter=0; ]QVNn?PA8  
 bih.biYPelsPerMeter=0; U75Jp%bL  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ]bZ(HC?KZr  
 static int filecount=0; rHjq1-t  
 CString name; FAsFjRS  
 name.Format("pict%04d.bmp",filecount++); - VxDNT}Tr  
 name=m_Path+name; .,0bE  
 BITMAPFILEHEADER bfh; +Q$h ]^>~  
 bfh.bfReserved1=bfh.bfReserved2=0; ,m_WR7!$E  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Lfog {Vzs  
 bfh.bfSize=54+size; #]P9b@@e  
 bfh.bfOffBits=54; 83%)/_&  
 CFile bf; lf(`SYQnOY  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ D^ Jk@<*  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); _ :Ag?2  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ?W>qUrZ  
  bf.WriteHuge(lpData,size); qpIC{'A.  
  bf.Close(); ntFT>g{B  
  nCount++; iOAbaPN  
 } sEMQ  
 GlobalFreePtr(lpData); p]T<HGJ P  
 if(nCount==1) +N`ua  
  m_Number.Format("%d picture captured.",nCount); J(DN !  
 else 9KWuN:Sg  
  m_Number.Format("%d pictures captured.",nCount); ~6YMD  
  UpdateData(FALSE); -m *Sq  
} Lk\P7w{  
u .f= te  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 21hv%CF\9  
{ ^XbU~3(  
 if(pMsg -> message == WM_KEYDOWN) }}v9 `F  
 { js iSg/  
  if(pMsg -> wParam == VK_ESCAPE) WHXj8*]6  
   return TRUE; SZaS;hhhHu  
  if(pMsg -> wParam == VK_RETURN) [S5\#=_4S  
   return TRUE; ljTBvU  
 } >zAUW[]C:I  
 return CDialog::PreTranslateMessage(pMsg); 86]p#n_>Fv  
} ,XDRO./+T  
Gmwf4>"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *g?Po+ef%  
{ 7X@mSXis  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ~t9tnLc$  
  SaveBmp(); n3A aZp[  
  return FALSE; (aOv#Vor]%  
} {9UEq0  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ >leU:7  
 CMenu pop; 4=<tWa|@9  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1`ayc|9BR  
 CMenu*pMenu=pop.GetSubMenu(0); q$I:`&  
 pMenu->SetDefaultItem(ID_EXITICON); hn#1%p6t  
 CPoint pt; q`-;AG|xF  
 GetCursorPos(&pt);  (x/k.&  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =UUU$hq2  
 if(id==ID_EXITICON) , ]bB9tid  
  DeleteIcon(); [!!Q,S"  
 else if(id==ID_EXIT) _ODbY;M  
  OnCancel(); ,eTU/Q>{,&  
 return FALSE; T5a*z}L5  
} h1'\:N`  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); lpz2 m\  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) PRHCrHs  
 AddIcon(); Fu!RhsW5j  
 return res; J8mdoVt  
} 89r DyRJ;  
dFKM 8_jH  
void CCaptureDlg::AddIcon() ^0/j0]O  
{ ;L']e"G  
 NOTIFYICONDATA data; ZK>WW  
 data.cbSize=sizeof(NOTIFYICONDATA); 5[c^TJ3  
 CString tip; feQ **wI  
 tip.LoadString(IDS_ICONTIP); +v=C@2T  
 data.hIcon=GetIcon(0); |PC*=ykT3  
 data.hWnd=GetSafeHwnd(); j~!X;PV3  
 strcpy(data.szTip,tip); ~l)-wNqR4r  
 data.uCallbackMessage=IDM_SHELL; J0@X<Lt U  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Q~Hy%M%R3  
 data.uID=98; M5 <@~V/[  
 Shell_NotifyIcon(NIM_ADD,&data); @Y1s$,=xB  
 ShowWindow(SW_HIDE); EK4d_L]I  
 bTray=TRUE; sBcPq SMby  
} \otWd  
N;\'N ne  
void CCaptureDlg::DeleteIcon() O#F4WWF  
{ @3zg=?3  
 NOTIFYICONDATA data; !QvZ<5(  
 data.cbSize=sizeof(NOTIFYICONDATA); G K7![p  
 data.hWnd=GetSafeHwnd(); ? #fu.YE\  
 data.uID=98; E{|W(z,  
 Shell_NotifyIcon(NIM_DELETE,&data); Y'8?.a]'  
 ShowWindow(SW_SHOW); "1%5,  
 SetForegroundWindow(); EM[WK+9>I{  
 ShowWindow(SW_SHOWNORMAL); DQ r Y*nH  
 bTray=FALSE; RJd(~1  
} 3.*8)NW  
))"6ern  
void CCaptureDlg::OnChange() [n :<8ho  
{ }hhGu\  
 RegisterHotkey(); !O<)\ )|g  
} "g1)f"pL  
iv4H#rJ  
BOOL CCaptureDlg::RegisterHotkey() "thdPZ  
{ tNbN7yI  
 UpdateData(); !6*"(  
 UCHAR mask=0; S[J}UpV  
 UCHAR key=0; _no*k?o *  
 if(m_bControl) ee^{hQi  
  mask|=4; ?!` /m|"  
 if(m_bAlt) 0@%v1Oja  
  mask|=2; V6@o]*  
 if(m_bShift) eS~LF.^Jw  
  mask|=1; -w"VK|SGm  
  key=Key_Table[m_Key.GetCurSel()]; 5fd]v<  
 if(bRegistered){ ~5}* d  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5:KQg  
  bRegistered=FALSE; Zg{KFM%  
 } ppVHLrUh  
 cMask=mask; ;EP:o%r  
 cKey=key; w|K'M?N14  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 4bYK}o S  
 return bRegistered; ,Ge"anO  
} z?R|Ok  
!WQ-=0cm  
  四、小结 -#N.X_F  
nH[yJGZYSA  
  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。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
温馨提示:欢迎交流讨论,请勿纯表情、纯引用!
认证码:
验证问题:
10+5=?,请输入中文答案:十五