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
  • 4768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: .,t"i C:E  
  "G\OKt'Z  
  一、实现方法 HCHZB*r[  
Fw!CssW  
  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: @}:}7R6  
?[>+'6  
#pragma data_seg("shareddata") wykk</eQ.i  
HHOOK hHook =NULL; //钩子句柄 >'3J. FY  
UINT nHookCount =0; //挂接的程序数目 1?\ #hemL  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ^;0.P)yGA  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 3dG[dYj  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ^a~^$PUqI  
static int KeyCount =0; y#HDJ=2  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 \^9SuZ  
#pragma data_seg() ,6Ulj+l  
Y_n^6 ;  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 d&n&_>  
g3@Qn?(j!  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: /P bN!r<1  
{7!WtH;-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR +qsNz*@p"  
cKey,UCHAR cMask) ]r;-Lx{F  
{ Gj]*_"T  
 BOOL bAdded=FALSE; z-*/jFE  
 for(int index=0;index<MAX_KEY;index++){ 1*aw~nY0  
  if(hCallWnd[index]==0){  FVOR~z  
   hCallWnd[index]=hWnd; !\.%^LK1  
   HotKey[index]=cKey; [!E pv<G  
   HotKeyMask[index]=cMask; k 9 Xi|Yj  
   bAdded=TRUE; ml$"C  
   KeyCount++; zCxr]md  
   break; {S4^;Va1  
  } Iuk!A?XV  
 } '&{`^l/ MH  
 return bAdded; |T:' G  
} 6XPf0Gl  
//删除热键 ..RCR_DIp  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1Wzm51RU  
{ yD|He*$S  
 BOOL bRemoved=FALSE; W|_^Oe<  
 for(int index=0;index<MAX_KEY;index++){ 4%/iu)nx  
  if(hCallWnd[index]==hWnd){ Z6%Hhk[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ IM:*uv  
    hCallWnd[index]=NULL; j}NGyS" =  
    HotKey[index]=0; q1QrtJFPG  
    HotKeyMask[index]=0; SS;[{u!  
    bRemoved=TRUE; {VqcZhqy/l  
    KeyCount--; _JZS;8WYR  
    break; L1;IXCc=  
   } 9$F '*{8  
  } g7G=ga  
 } GmoY~}cg~  
 return bRemoved; Jybx'vZj  
} >(Mu9ie*`  
bgs2~50  
Ym~*5|  
  DLL中的钩子函数如下: KF&1Y>t=  
_:4n&1{.E  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) #Pi}2RBRu  
{ hawE2k0p(  
 BOOL bProcessed=FALSE; 3#7D g't  
 if(HC_ACTION==nCode) w@U`@})r.  
 { };%l <Ui;  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 FFGG6r  
   switch(wParam) 5yO %|)  
   {  NsYeg&>`  
    case VK_MENU: v^_OX $=,  
     MaskBits&=~ALTBIT; @&!HMl  
     break; /L,VZ?CmtK  
    case VK_CONTROL: lTOO`g  
     MaskBits&=~CTRLBIT; KCG-&p$v@s  
     break; T^9k,J(rM  
    case VK_SHIFT: Y'6GY*dL  
     MaskBits&=~SHIFTBIT; "Xq.b"N{*  
     break; 1RC(T{\x  
    default: //judge the key and send message W ~sP7&sp  
     break; #SiOx/  
   } ^b-o  
   for(int index=0;index<MAX_KEY;index++){  ?Y4$  
    if(hCallWnd[index]==NULL) Zr`pOUk!4  
     continue; ;  ntq%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~x`BV+R  
    { r@;n \  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); tjw4.L<r  
     bProcessed=TRUE; v{7Jzjd  
    } (9bFIvMc  
   } Ms8& $  
  } QAiont ,!  
  else if((lParam&0xc000ffff)==1){ //有键按下 UR;F W`  
   switch(wParam) >q{E9.~b  
   { pUV3n 1{2  
    case VK_MENU: ~Xa8\>  
     MaskBits|=ALTBIT; \OMWE/qMy  
     break;  +c@s  
    case VK_CONTROL: cTW3\S=  
     MaskBits|=CTRLBIT; NEInro<  
     break; 8RS=Xemds  
    case VK_SHIFT: XI#1)  
     MaskBits|=SHIFTBIT; We]mm3M3  
     break; NijvFT$V1  
    default: //judge the key and send message .32]$vx  
     break; Nrp0z:  
   } ,[6N64fy  
   for(int index=0;index<MAX_KEY;index++){ no_(J>p^&  
    if(hCallWnd[index]==NULL) |FK ##8  
     continue; u;$g1 3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $6~ J#;  
    { dD _(MbTt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); </,RS5ukn  
     bProcessed=TRUE; + k1|+zzS  
    } Ji<^s@8Zc  
   } LIM cZh;  
  } #sLyU4QV  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 )%D2JC  
   for(int index=0;index<MAX_KEY;index++){ @SH%l]  
    if(hCallWnd[index]==NULL) Un{hI`3]  
     continue; 5.st!Lp1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^_dYE]t  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); d;GF<bz  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 iY @MnnX  
   } o/uA_19  
  } zqqu7.`  
 } ;{xk[f m=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); N;4tvWI  
} C^sHj5\(  
c#l W ?  
  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: ")%)e;V3  
7aAT  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); R7xKVS_MP  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *uJcB|KX  
}*4K{<02  
  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: G,+-}~$_  
# fvt:iE  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7]}n 0*fe  
{ Qs24b  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) NYS |fa  
 { rdK=f<I]  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 }:NE  
  SaveBmp(); .QRa{l_)  
  return FALSE; 7s#,.(s  
 } {%Mt-Gm'd  
 …… //其它处理及默认处理 d51.Tbt#%7  
} ;9w: %c1  
UA@(D  
j. 1@{H  
  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。 EA@p]+P  
7GN>o@t  
  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。 \^7D% a=;C  
l ;TWs_N  
  二、编程步骤 MXy~kb&  
GabY xYK  
  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"; 9d7`R'  
F' eV%g  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; mj\]oWS7d  
!RX7TYf  
  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; <5oG[1j  
;| (_;d  
  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; [l;9](\8O  
oqu; D'8  
  5、 添加代码,编译运行程序。 )n8(U%q$  
]xhZJ~"@u  
三、程序代码 !JZ)6mtlr  
TFrZ+CcWp2  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL MfzSoxCb  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) v[S>   
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Tk(ciwB  
#if _MSC_VER > 1000 ,{{e'S9cy  
#pragma once sxac( L  
#endif // _MSC_VER > 1000 \F_~?$  
#ifndef __AFXWIN_H__ U Ps7{We W  
#error include 'stdafx.h' before including this file for PCH RweK<Flo'S  
#endif 9 gt$z}oU  
#include "resource.h" // main symbols ][Ne;F6  
class CHookApp : public CWinApp p#['CqP8  
{ F(j vdq  
 public: }= )  
  CHookApp(); zCOzBL/1q  
  // Overrides p[kEFE,%  
  // ClassWizard generated virtual function overrides nP9zTa  
  //{{AFX_VIRTUAL(CHookApp) ko-:) z  
 public: NWK+.{s>m  
  virtual BOOL InitInstance(); 85$W\d  
  virtual int ExitInstance(); ``l7|b jJ  
  //}}AFX_VIRTUAL (_2;}eg  
  //{{AFX_MSG(CHookApp) )_$F/ug  
  // NOTE - the ClassWizard will add and remove member functions here. ) `u)#@x  
  // DO NOT EDIT what you see in these blocks of generated code ! u 3&9R)J1  
  //}}AFX_MSG 3vs;ZBM  
  DECLARE_MESSAGE_MAP() zq(R!a6  
}; 'q+CL&D  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 9NX/OctFa'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); | Vl Q0{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nYfZ[Q>v  
BOOL InitHotkey(); i+`N0!8lY  
BOOL UnInit(); Knd2s~S  
#endif La$*)qD,  
:C%cnU;N  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 4g^nhJP$  
#include "stdafx.h" $@H]0<3,  
#include "hook.h" 58T<~u7  
#include <windowsx.h> MiB"CcU  
#ifdef _DEBUG |$Y0VC4a  
#define new DEBUG_NEW _*(n2'2B  
#undef THIS_FILE =&kd|o/i  
static char THIS_FILE[] = __FILE__; 0~.OMG:=  
#endif x  RV@ _  
#define MAX_KEY 100 q-3,p.  
#define CTRLBIT 0x04 +YS0yTWeX  
#define ALTBIT 0x02 Gag=GHG  
#define SHIFTBIT 0x01 (QARle(i  
#pragma data_seg("shareddata") $j ZU(<4,  
HHOOK hHook =NULL; XMt5o&U1  
UINT nHookCount =0; %hEhZW{:  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey cr;\;Ta_!W  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT xPuuG{Sm  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey =#tQhg,_  
static int KeyCount =0; w 0V=49  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Re`'dde=  
#pragma data_seg() hj~nLgpN  
HINSTANCE hins; "mBX$t'gb  
void VerifyWindow(); a@>P?N~LA9  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) -F&4<\=+  
//{{AFX_MSG_MAP(CHookApp) 1 uKWvp0\  
// NOTE - the ClassWizard will add and remove mapping macros here. '?WKKYD7N  
// DO NOT EDIT what you see in these blocks of generated code! jHP6d =  
//}}AFX_MSG_MAP Fo$kD(  
END_MESSAGE_MAP() O!Rw? Y  
fT:a{  
CHookApp::CHookApp() #M9rt ~4  
{ wOhiC$E46  
 // TODO: add construction code here, Vh%=JL sK  
 // Place all significant initialization in InitInstance Lm-yTMNPn  
}  4[\[Ho  
WfnBWSA2 T  
CHookApp theApp; +\@) 1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) m[k@\xS4e  
{ WH@CH4WM  
 BOOL bProcessed=FALSE; G)vq+L5%  
 if(HC_ACTION==nCode) rKK{*%n  
 { UK{6Rh ;  
  if((lParam&0xc0000000)==0xc0000000){// Key up .Xq4QR .  
   switch(wParam) ;rD M%S@  
   { Rds_Cd C  
    case VK_MENU: =TTk5(m  
     MaskBits&=~ALTBIT; .BaU}-5  
     break; )Ha`>  
    case VK_CONTROL: QX1rnVzg0  
     MaskBits&=~CTRLBIT; dIQxU  
     break; %Ls5:Z=  
    case VK_SHIFT: L?W F[nF R  
     MaskBits&=~SHIFTBIT; L)0j&  
     break; b.Yl0Y  
    default: //judge the key and send message 1WArgR  
     break; %fv;C  
   } ]\fXy?2  
   for(int index=0;index<MAX_KEY;index++){ A7|CG[wZ  
    if(hCallWnd[index]==NULL) BCrX>Pp }r  
     continue; @raw8w\Zj+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @W{VT7w  
    { J.R|Xd  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); "s:eH"_s  
     bProcessed=TRUE; -AJ$-y  
    } 0`{3|g  
   } dKKh^D`~  
  } #Tr>[ZC  
  else if((lParam&0xc000ffff)==1){ //Key down yu<'-)T.?  
   switch(wParam) I04GQql  
   { 4| 6<nk_  
    case VK_MENU: }D/O cp~o  
     MaskBits|=ALTBIT; UJ}Xa&*H\  
     break; ZQ&A '(tt4  
    case VK_CONTROL: %syFHUBw  
     MaskBits|=CTRLBIT; M9 _G  
     break;  `PV+.V}  
    case VK_SHIFT: 7W{xK'|]  
     MaskBits|=SHIFTBIT; 3 &aBU [  
     break; /b$0).fj@,  
    default: //judge the key and send message V*$(Tt(  
     break; 2l7Sbs7  
   } /b44;U`v5-  
   for(int index=0;index<MAX_KEY;index++) hI&ugdf  
   { 2+Y 8b::  
    if(hCallWnd[index]==NULL) M;14s*g  
     continue; *{ =5AW}o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6:(R/9!P  
    { \[nvdvJv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); NXJyRAJ*%  
     bProcessed=TRUE; d]kP@flOV  
    } -G!W6$Y  
   } $& 0hpg  
  } vf |lF9@U  
  if(!bProcessed){ Ql%0%naq1  
   for(int index=0;index<MAX_KEY;index++){ h{$mL#J  
    if(hCallWnd[index]==NULL) 8 |@WuD  
     continue; %lr<;   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) * KDT0;/s  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "agc*o~!F  
   } j.'Rm%@u  
  } J?Ed^B-  
 } `|[" {j}^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _fVC\18T  
} lzKJy  
I jK  
BOOL InitHotkey() ]~')OSjw  
{ ZPM,ZGlu:  
 if(hHook!=NULL){ ?gq',F FDq  
  nHookCount++; FXAP]iqo  
  return TRUE; BIFuQ?j3  
 } wRc=;f  
 else Up(Jw-.  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 3eqVY0q  
  if(hHook!=NULL) >N&C-6W  
   nHookCount++; x6d0yJ <  
  return (hHook!=NULL); h`_@eax  
} *=6,}rX"I  
BOOL UnInit() /7bIE!Cn  
{ 34@f(^d+^  
 if(nHookCount>1){ bZ/4O*B  
  nHookCount--; &oA p[]  
  return TRUE; ,>DaS(  
 } ;}=4z^^5  
 BOOL unhooked = UnhookWindowsHookEx(hHook); qtx5N)J6  
 if(unhooked==TRUE){ z_Nw%V4kr  
  nHookCount=0; 3#IU^6l:1S  
  hHook=NULL; ^kS44pr\Q  
 } FUq>+U!Qu  
 return unhooked; DeMF<)#  
} )2U#<v^  
@iW^OVpp<8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) WWO@ULGY  
{ !A.Kb74  
 BOOL bAdded=FALSE; ]h Dy]  
 for(int index=0;index<MAX_KEY;index++){ Bn[5M [  
  if(hCallWnd[index]==0){ -:5]*zVp+-  
   hCallWnd[index]=hWnd; 7c:5 Ey  
   HotKey[index]=cKey; L5"|RI}  
   HotKeyMask[index]=cMask; 2EHeQ|#  
   bAdded=TRUE; oic}Go  
   KeyCount++; p|W <xFk  
   break; G)I lkA@  
  } l c<&f  
 } N|pyp*8Z  
 return bAdded; UF g N@  
} rCwjy&SuU^  
5`ma#_zk|f  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) x J;DkPh  
{ d/Sx+1 "{T  
 BOOL bRemoved=FALSE; W|go*+`W%  
 for(int index=0;index<MAX_KEY;index++){ aS7[s6  
  if(hCallWnd[index]==hWnd){ Ly0U')D:  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ A.mIqu,:  
    hCallWnd[index]=NULL; \Ty%E<  
    HotKey[index]=0; bt$+l[U^J  
    HotKeyMask[index]=0; /K#t$O4  
    bRemoved=TRUE; aYjFRH`  
    KeyCount--; ]Z@+ |&@L  
    break; vFKt=o$ g  
   } .kBZ(`K  
  } l )hg!(  
 } Hkc:B/6  
 return bRemoved; 9$9Pv%F:j  
} nUAs:Q  
..ig jc#UF  
void VerifyWindow() N"i'[!H%  
{ @ =RH_NB  
 for(int i=0;i<MAX_KEY;i++){ yM3]<~m  
  if(hCallWnd!=NULL){ Qi_De '@  
   if(!IsWindow(hCallWnd)){ G1Qc\mp  
    hCallWnd=NULL; IZ2c<B5&  
    HotKey=0; R+c  {Pl  
    HotKeyMask=0; 6j]pJ]F6  
    KeyCount--; W^c> (d</  
   } > 5i(U_`l  
  } c8o $WyO  
 } =xs{Ov=  
} +OUYQMmM  
[WOLUb  
BOOL CHookApp::InitInstance() 0FDfB;  
{ a\wpJ|3{=T  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); u 1?1x  
 hins=AfxGetInstanceHandle(); |JpLMUG  
 InitHotkey(); k5>K/;*9  
 return CWinApp::InitInstance(); oSb,)k@  
} Ax#$z  
-3M6[`/  
int CHookApp::ExitInstance() '`$US;5  
{ Min^EAG@  
 VerifyWindow(); %8?s3^ o  
 UnInit(); e3+'m  
 return CWinApp::ExitInstance(); ZaCUc Px  
} *):xK;o  
cuJ%;q=;  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 2?]NQE9lA  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) s W#}QYd  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !l7eB@O  
#if _MSC_VER > 1000 _084GK9{W  
#pragma once [Z3B~c  
#endif // _MSC_VER > 1000 YN\!I  
rb+&]  
class CCaptureDlg : public CDialog M PMa  
{ e ;4y5i  
 // Construction *wml 4lh  
 public: (6C%w)8'  
  BOOL bTray; FFTh}>>  
  BOOL bRegistered; k+^-;=u 6<  
  BOOL RegisterHotkey(); ub |tX 'o  
  UCHAR cKey; MZt~ Abt  
  UCHAR cMask; wIW]uo/=  
  void DeleteIcon(); u S$:J:Drx  
  void AddIcon(); $-dz1}  
  UINT nCount; 2 {lo  
  void SaveBmp(); wv 7j ES  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor C<!%VHs  
  // Dialog Data V 0<>Xo%  
  //{{AFX_DATA(CCaptureDlg) 0Hz*L,Bh4  
  enum { IDD = IDD_CAPTURE_DIALOG }; OUY 65K  
  CComboBox m_Key; :*wnO;eN  
  BOOL m_bControl; jk0Ja@8PK  
  BOOL m_bAlt; C0\A  
  BOOL m_bShift; AiXxn'&i  
  CString m_Path; zwAkXj  
  CString m_Number; _kR,R"lh  
  //}}AFX_DATA 7o$4ov;T  
  // ClassWizard generated virtual function overrides * \@u,[,  
  //{{AFX_VIRTUAL(CCaptureDlg) r)jj]$0  
 public: _rQM[{Bkg  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @_&@M~ u  
 protected: w5I +5/I  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8oI)q4V  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ~!c~jcq]lZ  
  //}}AFX_VIRTUAL Ybr&z7# 2  
  // Implementation +DwyMzeE  
 protected: kRBPl9 9  
  HICON m_hIcon; nw3CI&Y`  
  // Generated message map functions [XA  f=x  
  //{{AFX_MSG(CCaptureDlg) tqY)  
  virtual BOOL OnInitDialog(); +zpmy3Q  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 9/LI[{  
  afx_msg void OnPaint(); ,|4%YaN.3  
  afx_msg HCURSOR OnQueryDragIcon(); 1mw<$'pm0  
  virtual void OnCancel(); ~=5vc''  
  afx_msg void OnAbout(); `[JX}<~i  
  afx_msg void OnBrowse(); Re <G#*^  
  afx_msg void OnChange(); M[ea!an  
 //}}AFX_MSG  *$nz<?  
 DECLARE_MESSAGE_MAP() L]o 5=K  
}; ?XVJ$nzW  
#endif gB!K{ Io'  
C LhD[/Fo  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file UE4zmIq  
#include "stdafx.h" h' OLj#H  
#include "Capture.h" $x&\9CRM  
#include "CaptureDlg.h" |BD]K0  
#include <windowsx.h> X!0s__IOc  
#pragma comment(lib,"hook.lib") Gc) Zu`67  
#ifdef _DEBUG djVE x }  
#define new DEBUG_NEW eATX8`W  
#undef THIS_FILE i"uAT$xe  
static char THIS_FILE[] = __FILE__; !$'s?rnh  
#endif j|f$:j  
#define IDM_SHELL WM_USER+1 CB5 ~!nKv&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4'pg>;*.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RHo|&.B;+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; > m GO08X  
class CAboutDlg : public CDialog xN\ PQ,J  
{ iVM{ L  
 public: oI9Jp`  
  CAboutDlg(); 4C&L%A  
  // Dialog Data `;L0ax  
  //{{AFX_DATA(CAboutDlg) W?m?r.K?  
  enum { IDD = IDD_ABOUTBOX }; DXAA[hUjF  
  //}}AFX_DATA ZFy>Z:&S,  
  // ClassWizard generated virtual function overrides 1!RD kZw e  
  //{{AFX_VIRTUAL(CAboutDlg) dA<PQKm  
 protected: ' vO+,-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support hia_CuY#  
  //}}AFX_VIRTUAL ;b:Ct<  
  // Implementation QKYGeT7&Y'  
 protected: 9k_3=KS3N  
  //{{AFX_MSG(CAboutDlg) tk5Bb`a  
  //}}AFX_MSG }}v04~  
  DECLARE_MESSAGE_MAP() OiAi{ 71  
}; p1p4t40<l  
;ti{ #(Ux  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) WY%LeC!t  
{ M>df7.N7%P  
 //{{AFX_DATA_INIT(CAboutDlg) c?L_n=B  
 //}}AFX_DATA_INIT i]Or'L0c  
} aTC7H]e  
apk06"/  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) mqGp]'{  
{ x\j6=|  
 CDialog::DoDataExchange(pDX); |2!/<%Yr`  
 //{{AFX_DATA_MAP(CAboutDlg) /U[Y w)  
 //}}AFX_DATA_MAP ,,r%Y&:`6  
} -b-Pvw4  
)2mi6[qs0l  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) zO`54^  
 //{{AFX_MSG_MAP(CAboutDlg) u]P0:)tS.  
 // No message handlers /ve8);cH\  
 //}}AFX_MSG_MAP VIL #q  
END_MESSAGE_MAP() Ml8'=KN_  
\HF h?3-g  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)  m?hC!n>  
: CDialog(CCaptureDlg::IDD, pParent) =)C}u6  
{ GeN8_i[  
 //{{AFX_DATA_INIT(CCaptureDlg) %k#Q) zWJ  
  m_bControl = FALSE; xz YvD{>  
  m_bAlt = FALSE; 6C>x,kU  
  m_bShift = FALSE; DUiqt09`~  
  m_Path = _T("c:\\"); 9PEjV$0E2  
  m_Number = _T("0 picture captured."); "(ehf|%>%  
  nCount=0; 93:s[b mx  
  bRegistered=FALSE; w}pFa76rm  
  bTray=FALSE; ['m@RJm+  
 //}}AFX_DATA_INIT 4f~hd-z  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 u79.`,Ad&  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); dI&2dcumS  
} =vBxwa^  
kEWC  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 94"R&|  
{ Gk2\B]{  
 CDialog::DoDataExchange(pDX); 2a2C z'G  
 //{{AFX_DATA_MAP(CCaptureDlg) PL<q|y  
  DDX_Control(pDX, IDC_KEY, m_Key); '.oEyZA;o  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); "2(4?P  
  DDX_Check(pDX, IDC_ALT, m_bAlt); CDei+ q  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); iUqL /  
  DDX_Text(pDX, IDC_PATH, m_Path); >:5/V0;,  
  DDX_Text(pDX, IDC_NUMBER, m_Number); !<}<HR^ )  
 //}}AFX_DATA_MAP S|Wv1H>  
} kc `Q- N}  
%VsuG A  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) D %~s  
//{{AFX_MSG_MAP(CCaptureDlg) >1xlP/4jx  
 ON_WM_SYSCOMMAND() he&*N*of:  
 ON_WM_PAINT() M~;Ww-./  
 ON_WM_QUERYDRAGICON() LOi5 ^Um|  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) pm O}m>  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) eu ~WFI  
 ON_BN_CLICKED(ID_CHANGE, OnChange) \(jSkrrD  
//}}AFX_MSG_MAP IZeWswz  
END_MESSAGE_MAP() GEy^*, d  
N5[QQtQ  
BOOL CCaptureDlg::OnInitDialog() g+p?J.+  
{ dkJ+*L5  
 CDialog::OnInitDialog(); )El#Ks5u  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); axnkuP(  
 ASSERT(IDM_ABOUTBOX < 0xF000); 71nXROB  
 CMenu* pSysMenu = GetSystemMenu(FALSE); $+zev$f  
 if (pSysMenu != NULL) Lm"l*j4  
 { |eWlB\ x8  
  CString strAboutMenu; e.n&Os<|<  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ]~CG zV  
  if (!strAboutMenu.IsEmpty()) o6  
  { N54U [sy  
   pSysMenu->AppendMenu(MF_SEPARATOR); 2@Jw?+}vr  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); fLAOA9  
  } c3]ZU^  
 } D_D<N(O  
 SetIcon(m_hIcon, TRUE); // Set big icon X'e@(I!0  
 SetIcon(m_hIcon, FALSE); // Set small icon $d%m%SZxv  
 m_Key.SetCurSel(0); &H;0N"Fn  
 RegisterHotkey(); G$:T!  
 CMenu* pMenu=GetSystemMenu(FALSE); bl(rCbj(w  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); V[Fzh\2n  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Xm*gH, '  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 4&~1|B{Z  
 return TRUE; // return TRUE unless you set the focus to a control Zz= +?L  
} v! uD]}  
3,e^; {w  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) *^ncb,1+i  
{ &(-+?*A`E  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) !6\{q M  
 {  #-1 ;  
  CAboutDlg dlgAbout; zn&NLsA  
  dlgAbout.DoModal(); qYZX, x  
 } BftW<1,U^  
 else 3J~Q pw0<  
 { Jj_E/c"  
  CDialog::OnSysCommand(nID, lParam); i,M<}e1  
 } !.H< dQS  
} Hq"i0X m  
,95Nj h  
void CCaptureDlg::OnPaint() `$SX%AZA  
{ )FGm5-K@  
 if (IsIconic()) Y~hBVz2g  
 { gI6./;;x  
  CPaintDC dc(this); // device context for painting U-#wFc2N  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 7NV1w*> /  
  // Center icon in client rectangle L|EvI.f  
  int cxIcon = GetSystemMetrics(SM_CXICON); 4!,x3H'  
  int cyIcon = GetSystemMetrics(SM_CYICON); O8"kIDr-  
  CRect rect; ~~,\BhG?  
  GetClientRect(&rect); ir-srVoXy  
  int x = (rect.Width() - cxIcon + 1) / 2; (S* T{OgO  
  int y = (rect.Height() - cyIcon + 1) / 2; -("sp  
  // Draw the icon !"j?dQ.U;  
  dc.DrawIcon(x, y, m_hIcon); u.x>::i&  
 } rR&;2  
 else 03L+[F&"?  
 { .Ebg>j:\  
  CDialog::OnPaint(); AK%`EsI^  
 } ?<bByxa  
} SwpS6  
g"c\ouSY  
HCURSOR CCaptureDlg::OnQueryDragIcon() 4,!#E0  
{ Hly2{hokq  
 return (HCURSOR) m_hIcon; @~hiL(IR'  
} f/&gR5  
vzM8U>M  
void CCaptureDlg::OnCancel() 2Kovvh y#  
{ XCCN6[[+  
 if(bTray) o( Yfnnuy  
  DeleteIcon(); Pqli3(  
  CDialog::OnCancel(); URdCV{@42  
} Lqq RuKi  
;D&FZ|`(u  
void CCaptureDlg::OnAbout() [Nbs{f^J=  
{ Pp3<K649  
 CAboutDlg dlg; .;)7)%  
 dlg.DoModal(); W0J d2*]  
} XdjM/hB{fD  
0sM{yGu=,  
void CCaptureDlg::OnBrowse() ER<LP@3k  
{ G?)NDRM  
 CString str; n*{aN}auJ  
 BROWSEINFO bi; tSran  
 char name[MAX_PATH]; 9`]Gosz  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ~VYZu=p  
 bi.hwndOwner=GetSafeHwnd(); q">lP (t  
 bi.pszDisplayName=name; *UhYX)J  
 bi.lpszTitle="Select folder"; uOUgU$%zqH  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; s9+Rq*Qd  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 4<[,"<G~3  
 if(idl==NULL) ?-%Q[W  
  return; =+;l>mn?O  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 8Y?zxmwn]  
 str.ReleaseBuffer(); N^z4I,GV(  
 m_Path=str; kN_ i0~y@-  
 if(str.GetAt(str.GetLength()-1)!='\\') 8Yc'4v#}  
  m_Path+="\\"; z)p( l!  
 UpdateData(FALSE); ui%B|b&&  
} rT7W_[&P  
6RV42r^pf  
void CCaptureDlg::SaveBmp() lHQ:LI  
{ `,a6su (?  
 CDC dc; 67/JsL  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); no_;^Ou?  
 CBitmap bm; &0cfTb)dG  
 int Width=GetSystemMetrics(SM_CXSCREEN); .P(k |D&  
 int Height=GetSystemMetrics(SM_CYSCREEN); p^QZGu-.W  
 bm.CreateCompatibleBitmap(&dc,Width,Height); BBuI|lr  
 CDC tdc; j}O~6A>|  
 tdc.CreateCompatibleDC(&dc); n]:Xmi8p  
 CBitmap*pOld=tdc.SelectObject(&bm); 4o?_G[  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); " O0p.o  
 tdc.SelectObject(pOld); YbAa@Sq@  
 BITMAP btm; ;]c@%LX  
 bm.GetBitmap(&btm); |2t g3m@  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; :0N} K}  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 35=kZXwG+4  
 BITMAPINFOHEADER bih; -i93  
 bih.biBitCount=btm.bmBitsPixel; (:Di/{i&r5  
 bih.biClrImportant=0; 4A0 ,N8ja}  
 bih.biClrUsed=0; San3^uX  
 bih.biCompression=0; QL/I/EgqC  
 bih.biHeight=btm.bmHeight; %d?.v_Hu0  
 bih.biPlanes=1; S;@nPzhc  
 bih.biSize=sizeof(BITMAPINFOHEADER); vDI$ QUMD6  
 bih.biSizeImage=size; t 7GK\B8:  
 bih.biWidth=btm.bmWidth; 1%Hc/N-  
 bih.biXPelsPerMeter=0; 1.Kun !w  
 bih.biYPelsPerMeter=0; ayF+2(vch)  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); xb{G:v  
 static int filecount=0; ls[0X82F  
 CString name; ;IyA"C(i  
 name.Format("pict%04d.bmp",filecount++); pGZiADT  
 name=m_Path+name; M;2@<,rM  
 BITMAPFILEHEADER bfh; ? nx3# <  
 bfh.bfReserved1=bfh.bfReserved2=0; K(jo[S  
 bfh.bfType=((WORD)('M'<< 8)|'B'); k7,   
 bfh.bfSize=54+size; PY81MTv0;  
 bfh.bfOffBits=54; (|O9L s7N  
 CFile bf; %M)LC>c  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ \jA#RF.W  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); RW"QUT  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); vq?Lej  
  bf.WriteHuge(lpData,size); 4# +i\H`  
  bf.Close(); 7)Cn 4{B6  
  nCount++; )+Gw Yt  
 } )?`G"( y  
 GlobalFreePtr(lpData); 7b8+"5~  
 if(nCount==1) ^]rPda#  
  m_Number.Format("%d picture captured.",nCount); |WP}y- Au  
 else Xz,fjKUnN  
  m_Number.Format("%d pictures captured.",nCount); W*2d!/;7>  
  UpdateData(FALSE); #hMS?F|  
} 6LRvl6ik  
P{m(.EC_  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) {$>Pg/  
{ 2WO5Af%  
 if(pMsg -> message == WM_KEYDOWN) c'|](vOd]  
 { 5aZbNV}-  
  if(pMsg -> wParam == VK_ESCAPE) N 2XL5<  
   return TRUE; 4og/y0n,l"  
  if(pMsg -> wParam == VK_RETURN) JjMa   
   return TRUE; i}Q"'?  
 } G0%},Q/  
 return CDialog::PreTranslateMessage(pMsg); >U\1*F,Om,  
} bW-sTGjRD  
|hl:!j.t  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gOy;6\/  
{ l+nT$IPF  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ wn-1fz <d  
  SaveBmp(); UaCfXTG  
  return FALSE; c-VIpA1  
} B\54eTn  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ A3mvd-k  
 CMenu pop; ?3 S{>+'  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )4#YS$B$@)  
 CMenu*pMenu=pop.GetSubMenu(0); 9%Eo<+my h  
 pMenu->SetDefaultItem(ID_EXITICON); %_@T'!]  
 CPoint pt; c7~'GXxQ2  
 GetCursorPos(&pt); WAt= T3  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); -I ?8\  
 if(id==ID_EXITICON) I+{2DY/}  
  DeleteIcon(); a%nf )-}|  
 else if(id==ID_EXIT) dtj+ av G  
  OnCancel(); {8* d{0l  
 return FALSE; @WCA 7DW!  
} }]i.z:7+  
LRESULT res= CDialog::WindowProc(message, wParam, lParam);  Q}9!aB,  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |:w)$i& *  
 AddIcon(); I>EEUQR/$H  
 return res; OwCbv j0 #  
} oGRd ;hsF  
6gs0Vm  
void CCaptureDlg::AddIcon() m'zve%G  
{ [XE\2Qa8e  
 NOTIFYICONDATA data; "&:H }Jd  
 data.cbSize=sizeof(NOTIFYICONDATA); nIr:a|}[  
 CString tip; =Y-.=}jp;  
 tip.LoadString(IDS_ICONTIP); 5OCt Q4u  
 data.hIcon=GetIcon(0); d&* c3F  
 data.hWnd=GetSafeHwnd(); 2@N9Zk{{J  
 strcpy(data.szTip,tip); D7r&z?  
 data.uCallbackMessage=IDM_SHELL; s0O]vDTR,H  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; [ $5u:*  
 data.uID=98; 9Nw&l@  
 Shell_NotifyIcon(NIM_ADD,&data); pZcY[a  
 ShowWindow(SW_HIDE); BCfmnE4%  
 bTray=TRUE; ,j6 R/sg  
} \E=MV~:R  
k|,Y_h0Y  
void CCaptureDlg::DeleteIcon() 9=q&SG  
{ [l/!&6  
 NOTIFYICONDATA data; jF@BWPtF=  
 data.cbSize=sizeof(NOTIFYICONDATA); sW-0G$,|  
 data.hWnd=GetSafeHwnd(); <Umr2Vw-  
 data.uID=98; K491QXG  
 Shell_NotifyIcon(NIM_DELETE,&data); Aydpr_lp  
 ShowWindow(SW_SHOW); ;f~fGsH}e'  
 SetForegroundWindow(); %VGW]!QR  
 ShowWindow(SW_SHOWNORMAL); Ld 0*)rI#  
 bTray=FALSE; '&+]85_&$  
} -2[#1S*  
w4fQ~rcUIc  
void CCaptureDlg::OnChange() C :An  
{ mW$Oi++'d  
 RegisterHotkey(); :R`e<g~4  
} 5 JlgnxRq  
H:|.e)$i  
BOOL CCaptureDlg::RegisterHotkey() k`;d_eW  
{ '?jsH+j+  
 UpdateData(); +_L]d6  
 UCHAR mask=0; iZLy#5(St  
 UCHAR key=0; A=0{}B#  
 if(m_bControl) Y7zs)W8xTT  
  mask|=4; l$Vy\CfK3n  
 if(m_bAlt) A%2B3@1'q  
  mask|=2; HC} vO0X4  
 if(m_bShift) \HIBnkj)3n  
  mask|=1; 1c{m rsB  
  key=Key_Table[m_Key.GetCurSel()]; }N} Js*  
 if(bRegistered){ p+8o'dl8=  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); IG{ lr  
  bRegistered=FALSE; 'A>?aUq]:  
 } zYP6m3 n  
 cMask=mask; }SC&6B?G  
 cKey=key; K&n-(m%  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }L(ZLt8Q  
 return bRegistered; Y0Tad?iC  
} Y=4 7se=h"  
Do77V5  
  四、小结 8k3y"239t  
Wsgp#W+  
  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
欢迎提供真实交流,考虑发帖者的感受
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八