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
  • 7446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: ?V6+o`bm  
  ELF,T (  
  一、实现方法 n&?]GyQ  
&FQ]`g3_@  
  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: NNWbbU3wjh  
$N7:;X"l  
#pragma data_seg("shareddata") @ 2mJh^cj  
HHOOK hHook =NULL; //钩子句柄 zTFfft<  
UINT nHookCount =0; //挂接的程序数目 0:W*_w0Ge  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 d|,,,+fS  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 jg ~;s  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 3I)!.N[m  
static int KeyCount =0; G\ twx ;  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 V24i8Qx  
#pragma data_seg() |"[[.Adw9"  
|51z&dG  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 xg'FC/1LD  
T=8> 0D^v5  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: b";w\H  
RI#C r+/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 4|+6a6  
cKey,UCHAR cMask) D`r^2(WW  
{ a8?Zb^  
 BOOL bAdded=FALSE; /2,s-^  
 for(int index=0;index<MAX_KEY;index++){ sje}E+{[  
  if(hCallWnd[index]==0){  E%g_O_  
   hCallWnd[index]=hWnd; 'ADaz75`*r  
   HotKey[index]=cKey; E' p5  
   HotKeyMask[index]=cMask; %@<}z|.4  
   bAdded=TRUE; :#!m(s`  
   KeyCount++; Ga\E`J$c  
   break; / jI>=:z  
  } *iSsGb\M%  
 } "%+C@>`(  
 return bAdded; 'bP-p gc  
} o;o ji  
//删除热键 cw 3JSz9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =,D3e+P'  
{ jWb;Xk4  
 BOOL bRemoved=FALSE; q9- =>  
 for(int index=0;index<MAX_KEY;index++){ )Cuc ]>SC  
  if(hCallWnd[index]==hWnd){ j)Z3m @Ii5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ YoD1\a|  
    hCallWnd[index]=NULL; cad%:%p  
    HotKey[index]=0; NpRT\cx3  
    HotKeyMask[index]=0; /easmf]  
    bRemoved=TRUE; >6XGF(G   
    KeyCount--; ?YY'-\h?  
    break; *iB_$7n`  
   } V@jR8zv|_  
  } )W&H{2No  
 } f=v +D0K$n  
 return bRemoved; Rv=(D^F,  
} N|eus3\E  
.M_[tl  
CT6Ca,  
  DLL中的钩子函数如下: 3=!\>0;E-  
\WD}@6) ~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) < C\snB  
{ /H+j6*}r  
 BOOL bProcessed=FALSE; a;AvY O  
 if(HC_ACTION==nCode) }Vw"7  
 { IfoeHAWX  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 BH0@WG7F  
   switch(wParam) \AOVdnM:  
   {  vJkY  
    case VK_MENU: dBY,&=T4p  
     MaskBits&=~ALTBIT; l -~H Y*  
     break; y\Z7]LHCqw  
    case VK_CONTROL: #RK?3?wcr  
     MaskBits&=~CTRLBIT; |+//pGx  
     break; X}`|"NIk.  
    case VK_SHIFT: 3O<:eS~  
     MaskBits&=~SHIFTBIT; `[V]xP%V  
     break;  +Io^U  
    default: //judge the key and send message M{+Ie?ZI  
     break; xW*L^97 ;  
   } MyZ@I7Fb,  
   for(int index=0;index<MAX_KEY;index++){ ZbJzf]y:6  
    if(hCallWnd[index]==NULL) yG'5up  
     continue; Ip]-OVg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8>G3KZ3  
    { bH+p5Fd;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); > TG:}H(J  
     bProcessed=TRUE; HT/zcd)}#  
    } ,Z*?"d  
   } \R45#. P6X  
  } 6sb,*uSn%  
  else if((lParam&0xc000ffff)==1){ //有键按下 vj<HthC.k  
   switch(wParam) xg)cA C\=  
   { )sG`sET]`f  
    case VK_MENU: F+Og8^!  
     MaskBits|=ALTBIT; +DS_'Tmr  
     break; epi{Ayb  
    case VK_CONTROL: m sS5"Qr  
     MaskBits|=CTRLBIT; @giipF2$  
     break; %'Ebm  
    case VK_SHIFT: uW!',"0ER  
     MaskBits|=SHIFTBIT; P: &XtpP  
     break; |4BS\fx~N  
    default: //judge the key and send message W:8_S%~d  
     break; W0eb9g`s  
   } -Cv:lJj  
   for(int index=0;index<MAX_KEY;index++){ g*Nc+W](P>  
    if(hCallWnd[index]==NULL) t{tcy$bw  
     continue; 9mkt.>$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) po+>83/!oq  
    { ?!1K@/!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); g@YJ#S(}  
     bProcessed=TRUE; AQ 3n=Lr   
    } zghUwW|K  
   } aoQK.7  
  } m\|I.BUG  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 MGeHccqh2  
   for(int index=0;index<MAX_KEY;index++){ a6"Pe07t  
    if(hCallWnd[index]==NULL) bb[.Kvq5  
     continue; E$m3Gg)s>N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) FQ>KbZh  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); qczGv2%!  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 "NSm2RU3  
   } QkUq%}_0  
  } NxVqV5 '  
 } j[Uul#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 0XFJ/  
} O=8:K'  
 .BJ;}  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ac6Lv}w_  
=ZjF5,@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x3O$eKy\|5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @U'I_` LL  
%CJgJ,pk>  
  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: TO.?h!  
~]BxM9  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6-U|e|e  
{ O]RP?'vO  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) vttmSdY  
 { J_]?.V*A  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ZP5.?A-=C  
  SaveBmp(); v|`f8M2  
  return FALSE; R"#DR^.;  
 } SU9qF73Y  
 …… //其它处理及默认处理 ENm\1  
} :%Na-j9hV)  
Xu $_%+46  
@x?7J@:  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 #rM/  
hu.c&Q>  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 p< Emy%  
v??}d   
  二、编程步骤 7k}[x|u  
_3DRCNvh  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; j#r|t+{"C  
74hGkf^S  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 0TK+R43_  
2[: *0 DV#  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; / 2>\Z(  
znv2:  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; XNkw9*IT  
W*i PseXq  
  5、 添加代码,编译运行程序。 x0B|CO  
;o }pRC  
三、程序代码 @SeE,<  
j4Ppn  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL We% -?l:"  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) )B.NV<m  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ lR_ 4iyqb  
#if _MSC_VER > 1000 DZKVZ_q  
#pragma once O?|opD  
#endif // _MSC_VER > 1000 q\*",xZxwz  
#ifndef __AFXWIN_H__ !fUrDOM0E  
#error include 'stdafx.h' before including this file for PCH syhTOhOX  
#endif Y}%=:Yt  
#include "resource.h" // main symbols Q`}1 B   
class CHookApp : public CWinApp 52K_kB5  
{ +[M5x[[$  
 public: ;|&Ak_I2G  
  CHookApp(); YFgQ!\&59  
  // Overrides *.4;7#  
  // ClassWizard generated virtual function overrides R}7>*&S:  
  //{{AFX_VIRTUAL(CHookApp) 4HEp}Y"}V  
 public: VE1 B"s</  
  virtual BOOL InitInstance(); RGh `=D/yE  
  virtual int ExitInstance(); jrT5Rw_}q  
  //}}AFX_VIRTUAL F }l_=  
  //{{AFX_MSG(CHookApp) Kg^L 4Q  
  // NOTE - the ClassWizard will add and remove member functions here. q@1!v  
  // DO NOT EDIT what you see in these blocks of generated code ! ZOvMA]Rf  
  //}}AFX_MSG  Ub(zwR;  
  DECLARE_MESSAGE_MAP() Ex^|[iV  
}; 6U)Lhf\'o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); "MZj}}l  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;Q>(%"z};  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m:A 7*r[  
BOOL InitHotkey(); tgEXX-{  
BOOL UnInit(); -_BS!T%r  
#endif 6O2 r5F$T  
BtDi$d%'  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. sr,8zKM)  
#include "stdafx.h" `P}T{!P+6  
#include "hook.h" l1On .s  
#include <windowsx.h> h 3Kv0^{  
#ifdef _DEBUG r!+-"hS!  
#define new DEBUG_NEW `r;e\Cp  
#undef THIS_FILE U WYLT-^x  
static char THIS_FILE[] = __FILE__; Q|Uq.UjY  
#endif Q| > \{M  
#define MAX_KEY 100 Wo=Q7~  
#define CTRLBIT 0x04 Rr+Y::E  
#define ALTBIT 0x02 KY$6=/?U_  
#define SHIFTBIT 0x01 mwLp~z%OX  
#pragma data_seg("shareddata") Kt3/C'zu  
HHOOK hHook =NULL; *L> gZ`Q  
UINT nHookCount =0; `~Nd4EA)2  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey =;Gy"F1 dp  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT "pTyQT9P  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey "Wd?U[[  
static int KeyCount =0; 9NvV{WI-1  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 4jEPh{q  
#pragma data_seg() j&)"a,f  
HINSTANCE hins; 6KP"F[8I  
void VerifyWindow(); 6-C9[[g<  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 0]3%BgZ(a8  
//{{AFX_MSG_MAP(CHookApp) Hp;Dp!PLa  
// NOTE - the ClassWizard will add and remove mapping macros here. JK0L&t<  
// DO NOT EDIT what you see in these blocks of generated code! {#YGor|  
//}}AFX_MSG_MAP $>zLa_cn|  
END_MESSAGE_MAP() =B O} hk  
p|VoIQY  
CHookApp::CHookApp() DPR=Xls  
{ Cn4o^6?"  
 // TODO: add construction code here, eKV^ia  
 // Place all significant initialization in InitInstance NltEX14Af  
} U{n< n8  
KA1Z{7UK%  
CHookApp theApp; =\H.C@r  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :FOMRrf7.  
{ H@%Y!z@\  
 BOOL bProcessed=FALSE; * bx%hX  
 if(HC_ACTION==nCode) .lm^+1}r  
 { _KVge)j  
  if((lParam&0xc0000000)==0xc0000000){// Key up b6BeOR*ps  
   switch(wParam) RMU]GCa  
   { zMasA  
    case VK_MENU: Zn&S7a>7  
     MaskBits&=~ALTBIT; X]d["  
     break; l%@>)%LA  
    case VK_CONTROL: >(+g:p  
     MaskBits&=~CTRLBIT; >en,MT|  
     break; Yy]^_,r  
    case VK_SHIFT: D/pc)3Ofe  
     MaskBits&=~SHIFTBIT; }WXO[ +l  
     break; T1yJp$yD"  
    default: //judge the key and send message qXmkeidb&W  
     break; $8#zPJR&  
   } \A'MEd-  
   for(int index=0;index<MAX_KEY;index++){ X,d`-aKO\y  
    if(hCallWnd[index]==NULL) 6u^M fOc  
     continue; rxtp?|v9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) r<4FF=  
    { +BcJHNIB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); v#i,pBj  
     bProcessed=TRUE; 7N0V`&}T  
    } .} <$2.  
   }  J5 PXmL  
  }  boAu  
  else if((lParam&0xc000ffff)==1){ //Key down `PK1zSr  
   switch(wParam) T^YdAQeE  
   {  mD`v>L  
    case VK_MENU: *ZP$dQ  
     MaskBits|=ALTBIT; cSy{*K{B  
     break; '&4W@lvyz  
    case VK_CONTROL: I\J ^@&JE  
     MaskBits|=CTRLBIT; _IiTB  
     break; {p&M(W]  
    case VK_SHIFT: d>@&[C!28  
     MaskBits|=SHIFTBIT; !ckmNE0  
     break; dbF?#s~u  
    default: //judge the key and send message Om`VQ?  
     break; *{|{T_H:  
   } +$R4'{9q  
   for(int index=0;index<MAX_KEY;index++) t.Hte/,k  
   { {w*5uI%%e  
    if(hCallWnd[index]==NULL) #M$Gj>E%4  
     continue; I_66q7U"0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &`hx   
    { M]PH1 2Ob  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "@Ir Bi6  
     bProcessed=TRUE; "bZ {W(h  
    } qzq_3^ 66  
   } FTvFtdY  
  } j?sq i9#  
  if(!bProcessed){ '?Fw]z1$  
   for(int index=0;index<MAX_KEY;index++){ ]#>;C:L  
    if(hCallWnd[index]==NULL) 8$</HNu,  
     continue; Z%_"-ENT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [>l 2E  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); QT X5F5w  
   } Bu4J8eLx  
  } PScq-*^  
 } T0Lh"_X3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); JD1IL` ta;  
} 9AQMB1D*v4  
kc#<Gr&Z&  
BOOL InitHotkey() }!{9tc$<b  
{ ] ;X[xs  
 if(hHook!=NULL){ F!m/n!YR  
  nHookCount++; QRb iO  
  return TRUE; PYWp2V/  
 } X1Vx 6+[  
 else D90m..\w  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); [_W#8{  
  if(hHook!=NULL) p^1s9CM%  
   nHookCount++; /.!ytHw8  
  return (hHook!=NULL); LliOhr4  
} 5P{PBd}glp  
BOOL UnInit() owYf1=G  
{ [7d>c  
 if(nHookCount>1){ 26n+v(re  
  nHookCount--; VNKtJmt  
  return TRUE; @64PdM!L  
 } 20glz(  
 BOOL unhooked = UnhookWindowsHookEx(hHook); -yKx"Q9F  
 if(unhooked==TRUE){ yhnhORSY;  
  nHookCount=0; + ;u<tA  
  hHook=NULL; )+ }\NCFh  
 } D*!p8J8Ku  
 return unhooked; :H/CiN  
} daamP$h9  
#gjhs"$~  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) SymBb}5  
{ bF'Y.+"dr  
 BOOL bAdded=FALSE; pU4k/v555;  
 for(int index=0;index<MAX_KEY;index++){ 3|1ug92  
  if(hCallWnd[index]==0){ $#q:\yQsPC  
   hCallWnd[index]=hWnd; \ZSZ(p#1  
   HotKey[index]=cKey; q1C) *8*g  
   HotKeyMask[index]=cMask; ry bs9:_}  
   bAdded=TRUE; @wa2Z  
   KeyCount++; b[}f]pB@n  
   break; 1u4)  
  } R%7* )3$&r  
 } c@p4,G  
 return bAdded; ,l}mCY  
} Vgzw['L}  
p(B> N!:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1CS[%)-c  
{ 3q +C8_:  
 BOOL bRemoved=FALSE; t;?M#I\,{  
 for(int index=0;index<MAX_KEY;index++){ ;+pS-Zb 6  
  if(hCallWnd[index]==hWnd){ N>8p A)  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Z4+S4cqnh  
    hCallWnd[index]=NULL; d4'*K1m   
    HotKey[index]=0; Gwl]sMJ  
    HotKeyMask[index]=0; /F#_~9JXG  
    bRemoved=TRUE; h>jLhj<07W  
    KeyCount--; wNzALfS  
    break; tu.Tvtudzj  
   } p'# (^  
  } rl#[HbPM  
 } 3=r#=u5z  
 return bRemoved; 4dv5  
} k 4|*t}o7  
G's >0  
void VerifyWindow() SRL`!  
{ sfLH[Q?  
 for(int i=0;i<MAX_KEY;i++){ 3awh>1N2 W  
  if(hCallWnd!=NULL){ ;%u'w;sgq  
   if(!IsWindow(hCallWnd)){ +C`h*%BW  
    hCallWnd=NULL; Grot3a  
    HotKey=0; .m',*s<CMQ  
    HotKeyMask=0; qIm?F>> @  
    KeyCount--; ,:RHhg  
   } wD(1Sr5n  
  } <Uz~V;  
 } *Ru@F:  
} rLt`=bl&&U  
ED9uKp<Wbv  
BOOL CHookApp::InitInstance() rgth2y]  
{ Iud]*5W  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); )TYrb:M'm  
 hins=AfxGetInstanceHandle(); E: EXp7  
 InitHotkey(); 6Xu^ cbD  
 return CWinApp::InitInstance(); <>!Y[Xr^  
} 8&q|*/2  
2|J>e(&akY  
int CHookApp::ExitInstance() F_KPhe$  
{ j2oHwt6"  
 VerifyWindow(); 3Zy$NsY3  
 UnInit(); m53XN  
 return CWinApp::ExitInstance(); HH_w!_f  
} %O9kq  
+o{]0~ y  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file CYIp 3D'k  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) uU_0t;oR3  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ l| / tKW  
#if _MSC_VER > 1000 y^M ~zOe  
#pragma once -68E]O  
#endif // _MSC_VER > 1000 xLUgbql-  
jt({@;sU[<  
class CCaptureDlg : public CDialog q(tdBd'o6  
{ () l#}H`m  
 // Construction \>8r)xC  
 public: .#py5&`%  
  BOOL bTray; MjGeH>c  
  BOOL bRegistered; ["5Z =4  
  BOOL RegisterHotkey(); k]J!E-yI8  
  UCHAR cKey; QfLDyJv`e  
  UCHAR cMask; &4g]#A>@  
  void DeleteIcon(); !8cS1(a  
  void AddIcon(); H l'za  
  UINT nCount; <IiX_*  
  void SaveBmp(); f 7g?{M  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor '|v??`o#  
  // Dialog Data IU f1N+-z  
  //{{AFX_DATA(CCaptureDlg) <2{CR0]u  
  enum { IDD = IDD_CAPTURE_DIALOG }; Gz>M Y4+G  
  CComboBox m_Key; <<xUh|zE  
  BOOL m_bControl; B/P E{ /  
  BOOL m_bAlt; 9XU"Ppv  
  BOOL m_bShift; iy{n"#uX  
  CString m_Path; xwSi}.  
  CString m_Number; + -[M 7J  
  //}}AFX_DATA $UgQ1Qc  
  // ClassWizard generated virtual function overrides | rY.IbL  
  //{{AFX_VIRTUAL(CCaptureDlg) RR*eq.;  
 public: @-uV6X8|  
  virtual BOOL PreTranslateMessage(MSG* pMsg); )3W`>7>  
 protected: XiP xg[;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]h]|PdN  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); fSe$w#*I  
  //}}AFX_VIRTUAL /}%$fB  
  // Implementation p i ;,?p-  
 protected: Idq &0<I  
  HICON m_hIcon; BhO*Pfs  
  // Generated message map functions 3<5E254N  
  //{{AFX_MSG(CCaptureDlg) P>*B{fi^  
  virtual BOOL OnInitDialog(); m@|0iDS  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); #>I*c _-  
  afx_msg void OnPaint(); ~Ibq,9i  
  afx_msg HCURSOR OnQueryDragIcon(); vDG AC'  
  virtual void OnCancel(); <W,M?r+  
  afx_msg void OnAbout(); 3~Qvp )~  
  afx_msg void OnBrowse(); ?Cg",k'  
  afx_msg void OnChange(); \KBE+yj  
 //}}AFX_MSG ~/R,oQ1!g}  
 DECLARE_MESSAGE_MAP() O'<5PwhG  
}; {km~,]N  
#endif ^/K]id7 2  
wi7a_^{  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 3^ct;gz  
#include "stdafx.h" %kod31X3<  
#include "Capture.h" xJ/<G$LNJ0  
#include "CaptureDlg.h" 6P0\t\D0  
#include <windowsx.h> \0K3TMl)J  
#pragma comment(lib,"hook.lib") S4r-s;U-v/  
#ifdef _DEBUG +<\)b(  
#define new DEBUG_NEW `v]|x,l+C  
#undef THIS_FILE yvPcD5s5  
static char THIS_FILE[] = __FILE__; #84<aM  
#endif qDMVZb-(#  
#define IDM_SHELL WM_USER+1 75u5zD   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4Nz@s^9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |.OXe!uU41  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; v)^8e0vx  
class CAboutDlg : public CDialog \!+sL JP  
{ x WZ87  
 public: *.4VO+^  
  CAboutDlg(); &, =Z  
  // Dialog Data COV8=E~  
  //{{AFX_DATA(CAboutDlg) |)"`v'8>  
  enum { IDD = IDD_ABOUTBOX }; bO)voJ<  
  //}}AFX_DATA **oa R  
  // ClassWizard generated virtual function overrides 7W)*IJ  
  //{{AFX_VIRTUAL(CAboutDlg) Ukf4Q\@w  
 protected: X?2ub/Nr#Y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support E%A] 8y7  
  //}}AFX_VIRTUAL {S+  $C  
  // Implementation hkifd4#  
 protected: ,'7 X|z/_>  
  //{{AFX_MSG(CAboutDlg) -y@# ^SrJ  
  //}}AFX_MSG 4pYscB  
  DECLARE_MESSAGE_MAP() %K9 9_Cl3  
}; ;9WS#>o  
Yqpe2II7  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) n54}WGo>9  
{ e`N/3q7  
 //{{AFX_DATA_INIT(CAboutDlg) GmjTxNU@  
 //}}AFX_DATA_INIT #:UP'v=w  
} n9PCSl j  
OoG Nij  
void CAboutDlg::DoDataExchange(CDataExchange* pDX)  BZ'63  
{ 6k1;62Ntk  
 CDialog::DoDataExchange(pDX); kYwV0xQ  
 //{{AFX_DATA_MAP(CAboutDlg) |%V-|\GJ~j  
 //}}AFX_DATA_MAP g>@T5&1q*  
} O]| T !  
_m;H$N~I#  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) jcC "S qL  
 //{{AFX_MSG_MAP(CAboutDlg) uR;m<wPH,f  
 // No message handlers )z:"P;b"Nl  
 //}}AFX_MSG_MAP T5:p^;?g  
END_MESSAGE_MAP() 5{`a\;*  
<k41j=d  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Ct8}jg"  
: CDialog(CCaptureDlg::IDD, pParent) I%8>nMTJ  
{ ;,OZ8g)LH  
 //{{AFX_DATA_INIT(CCaptureDlg) w=|"{-ijo  
  m_bControl = FALSE; aMLtZ7i>  
  m_bAlt = FALSE; Vr|sRvz  
  m_bShift = FALSE; >[$j(k^  
  m_Path = _T("c:\\"); HVG:q#=C  
  m_Number = _T("0 picture captured."); E8`AU<  
  nCount=0; 3 P)N,  
  bRegistered=FALSE; EG7.FjnVu  
  bTray=FALSE; s<GR ?  
 //}}AFX_DATA_INIT j\/Rjn+:[  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 p7Q}xx  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); qm!&(8NfK  
} ?y1G,0,  
dTATJ)NH  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) { Rd){ky@  
{ =IIB~h[TB  
 CDialog::DoDataExchange(pDX); A9D vU)1  
 //{{AFX_DATA_MAP(CCaptureDlg) `A\|qH5`W  
  DDX_Control(pDX, IDC_KEY, m_Key); h#e((j3-2Z  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); }$5e!t_K  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ZLN79r{T  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); bvR0?xn q  
  DDX_Text(pDX, IDC_PATH, m_Path); {&I3qk2(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 6 _Cc+}W  
 //}}AFX_DATA_MAP Ig.9:v`  
} o 9?#;B$  
f@)GiLC'"  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 3|Vh[iAa\  
//{{AFX_MSG_MAP(CCaptureDlg) v\#1&</qd^  
 ON_WM_SYSCOMMAND() Z%_m<Nf8T  
 ON_WM_PAINT() $K'A_G^  
 ON_WM_QUERYDRAGICON() -9X#+-  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) %F.^cd"  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) I<&(Dg|XQ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) JKJ+RkXf3  
//}}AFX_MSG_MAP u/,ng&!  
END_MESSAGE_MAP() 9 M<3m  
 4u.v7r  
BOOL CCaptureDlg::OnInitDialog() ;d#`wSF`G  
{ i*3*)ly  
 CDialog::OnInitDialog(); +{7/+Zz  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); W["c3c  
 ASSERT(IDM_ABOUTBOX < 0xF000); IW~q,X+`V  
 CMenu* pSysMenu = GetSystemMenu(FALSE); UpoTXA D}k  
 if (pSysMenu != NULL) a6/$}lCq  
 { Ln3<r&&Jz  
  CString strAboutMenu; |B` mWZ'"  
  strAboutMenu.LoadString(IDS_ABOUTBOX); :wR aB7  
  if (!strAboutMenu.IsEmpty()) YU (|i}b  
  { V\=QAN^  
   pSysMenu->AppendMenu(MF_SEPARATOR); HUuZ7jJwf  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); :'+- %xUM  
  } :#pfv)W6t  
 } [ELg:f3}5  
 SetIcon(m_hIcon, TRUE); // Set big icon NZaMF.  
 SetIcon(m_hIcon, FALSE); // Set small icon UbDRE[^P  
 m_Key.SetCurSel(0); $HE ?B{  
 RegisterHotkey(); %1jlXa  
 CMenu* pMenu=GetSystemMenu(FALSE); gA/8Df\G:l  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); \-F F[:|J  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ky^u.+cZ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); {CVn&|}J  
 return TRUE; // return TRUE unless you set the focus to a control Zf [#~4  
} V9SkB3-'  
ndB [f  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 6.0/asN}  
{ !=t.AgmL  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) kH9fK80  
 { hp< NVST  
  CAboutDlg dlgAbout; K[G=J  
  dlgAbout.DoModal(); rO;Vr},3\%  
 } +j">Ju6Q;.  
 else ~4t7Q  
 { 08pG)_L  
  CDialog::OnSysCommand(nID, lParam); ?A\[EI^  
 } O.+02C_*  
} 8h=Rfa9  
@*s7~:VQ  
void CCaptureDlg::OnPaint() '4 x uH3  
{ wFHz<i!jr&  
 if (IsIconic()) ta)'z@V@g  
 { !}$,) ~<+H  
  CPaintDC dc(this); // device context for painting UwQyAD]Ht  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); PRpW*#"EI  
  // Center icon in client rectangle "^3pP(8;~  
  int cxIcon = GetSystemMetrics(SM_CXICON); P m}  
  int cyIcon = GetSystemMetrics(SM_CYICON); A"PmoV?lAm  
  CRect rect; _=s{,t &u  
  GetClientRect(&rect); =w#sCy  
  int x = (rect.Width() - cxIcon + 1) / 2; EWX!:BKf  
  int y = (rect.Height() - cyIcon + 1) / 2; p0b2n a !  
  // Draw the icon no`>r}C  
  dc.DrawIcon(x, y, m_hIcon); }@'Zt6+tS  
 } F ~O}@e{  
 else due'c!wW  
 {  Q&d"uLsx  
  CDialog::OnPaint(); Jd0I!L  
 } MRn;D|Q  
} D3MRRv#  
}0(.HMiGj  
HCURSOR CCaptureDlg::OnQueryDragIcon() h,u?3}Knnb  
{ zwEZ?m!  
 return (HCURSOR) m_hIcon; +_E\Omcw  
} }-8ZSWog6f  
WXgGB[x  
void CCaptureDlg::OnCancel() bf2B  
{ q=+AN</  
 if(bTray) ',g'Tl^E  
  DeleteIcon(); <8_~60  
  CDialog::OnCancel(); pk&;5|cCD  
} i[\`]C{gf  
DGY?4r7>y  
void CCaptureDlg::OnAbout() S.$/uDwo  
{ P+j5_V{\b  
 CAboutDlg dlg; r: :LQ$  
 dlg.DoModal(); I_\#(  
} (tLAJ_v!.K  
)kl(}.9X  
void CCaptureDlg::OnBrowse() sBuOKT/j  
{ f(r=S Xa*  
 CString str; 7B"*< %<  
 BROWSEINFO bi; +uD4$Wt_F  
 char name[MAX_PATH]; p+pBk$4  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); BIM!4MHLA  
 bi.hwndOwner=GetSafeHwnd(); zQNkjQ{mx  
 bi.pszDisplayName=name; Qe6'W  
 bi.lpszTitle="Select folder"; $QB~ x{v@n  
 bi.ulFlags=BIF_RETURNONLYFSDIRS;  `[=3_  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]3/_?n-"`  
 if(idl==NULL) {0t-Q k  
  return; &P,z$H{o@  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); l2lyi  
 str.ReleaseBuffer(); TODTR7yGo  
 m_Path=str; m+ww  
 if(str.GetAt(str.GetLength()-1)!='\\') )^^Eh=Kbj  
  m_Path+="\\"; $afE= qC*  
 UpdateData(FALSE); E/6@>.T?'  
} &LD=Zp%  
`YinhO:Z  
void CCaptureDlg::SaveBmp() OlwORtWzZ  
{ ^ rB7&96C,  
 CDC dc; 2[; 4D/`*  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); GqT 0SP  
 CBitmap bm; jLy3c@Dp  
 int Width=GetSystemMetrics(SM_CXSCREEN); Y>l92=G  
 int Height=GetSystemMetrics(SM_CYSCREEN); z|5Sy.H>  
 bm.CreateCompatibleBitmap(&dc,Width,Height); s?g`ufF.t  
 CDC tdc; {@7{!I|eD  
 tdc.CreateCompatibleDC(&dc); s,*kWy"jp  
 CBitmap*pOld=tdc.SelectObject(&bm); 6L)]nE0^  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); jwe^(U  
 tdc.SelectObject(pOld); tU :,s^E"#  
 BITMAP btm; fZH";_"1  
 bm.GetBitmap(&btm); "yo~;[  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; (r]3tGp  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); _K#LOSMfj/  
 BITMAPINFOHEADER bih; 6hvmp  
 bih.biBitCount=btm.bmBitsPixel; 42Vz6 k:  
 bih.biClrImportant=0; <:t D m  
 bih.biClrUsed=0; e/{1u$  
 bih.biCompression=0; ^q$m>|KI  
 bih.biHeight=btm.bmHeight; :{YOJDtR  
 bih.biPlanes=1; <Z -d5D>  
 bih.biSize=sizeof(BITMAPINFOHEADER); 1l(_SD;90t  
 bih.biSizeImage=size; zv%9?:  
 bih.biWidth=btm.bmWidth;  >>nt3q  
 bih.biXPelsPerMeter=0; e7cqm*Qi  
 bih.biYPelsPerMeter=0; Gd]!D~[1  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); x^J}]5{0  
 static int filecount=0; |1@/gqa  
 CString name; l?AWG&  
 name.Format("pict%04d.bmp",filecount++); 1$]hyC/f  
 name=m_Path+name; Cqy)+x_OQ,  
 BITMAPFILEHEADER bfh; N!u(G  
 bfh.bfReserved1=bfh.bfReserved2=0; iLyJ7zby  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 6u'+#nm  
 bfh.bfSize=54+size; a+--2+~=  
 bfh.bfOffBits=54; !RJuH;8  
 CFile bf; x<S?"  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ wj'5D0   
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); tsLi5;KA]  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); _^;;vR%   
  bf.WriteHuge(lpData,size); \U0p?wdr:  
  bf.Close(); t5qNfiKC  
  nCount++; VEuT!^0Z  
 } Jbmi[` O  
 GlobalFreePtr(lpData); \"X<\3z2  
 if(nCount==1) >H*?ktcW  
  m_Number.Format("%d picture captured.",nCount); F_?aoP&5  
 else @ z{E  
  m_Number.Format("%d pictures captured.",nCount); PS13h_j  
  UpdateData(FALSE); Buue][[  
} ];vEj*jCX  
c5($*tTT  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) S"/M+m+ ]  
{ T"NDL[*  
 if(pMsg -> message == WM_KEYDOWN) {}#W~1`  
 { +] .Zs<  
  if(pMsg -> wParam == VK_ESCAPE) T/A[C  
   return TRUE; #})OnM^],  
  if(pMsg -> wParam == VK_RETURN) _I&];WM\  
   return TRUE; w,<nH:~  
 } xux j  
 return CDialog::PreTranslateMessage(pMsg);  bK7j"  
} ZP]l%6\.  
<ah!!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2}ttC m  
{ Q}A*{9#|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ AaVj^iy/X  
  SaveBmp(); $Ka-ZPy<#  
  return FALSE; 7AE)P[  
} " wB~*,Ny  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ |fJpX5W-l  
 CMenu pop; jmDQKqEc|l  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); aWG7k#nE  
 CMenu*pMenu=pop.GetSubMenu(0); Ed(6%kd  
 pMenu->SetDefaultItem(ID_EXITICON); Y\Z.E ;  
 CPoint pt; rhLm2q  
 GetCursorPos(&pt); uh][qMyLM  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ^ RS?y8  
 if(id==ID_EXITICON) g.& n X/  
  DeleteIcon(); =lE_ Q[P  
 else if(id==ID_EXIT) vw;GbQH(  
  OnCancel(); xcF:moL  
 return FALSE; (sXR@Ce$  
} VdVUYp  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0E6tH& ;>  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Jvk!a~e  
 AddIcon(); DvBL #iC   
 return res; dK5|tWJX  
} Q :<&<i=I  
^UB<U#8,  
void CCaptureDlg::AddIcon() ': }  
{ xXCSaBS~  
 NOTIFYICONDATA data; :r{;'[38  
 data.cbSize=sizeof(NOTIFYICONDATA); ?l6NQ;z  
 CString tip; ^9{mjy0Q  
 tip.LoadString(IDS_ICONTIP); ^F>C|FJ2  
 data.hIcon=GetIcon(0); yc#0c[ZQu  
 data.hWnd=GetSafeHwnd(); lji&]^1  
 strcpy(data.szTip,tip); X0h`g)Bbf  
 data.uCallbackMessage=IDM_SHELL; th$?#4SbR  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; *gq~~(jH  
 data.uID=98; Z'vic#  
 Shell_NotifyIcon(NIM_ADD,&data); O>5xFz'm  
 ShowWindow(SW_HIDE); PD- <D~7  
 bTray=TRUE; tSP)'N<  
} n#{z"G  
Qx B0I/ {  
void CCaptureDlg::DeleteIcon() |wnXBKV(  
{ f.Uvf^T}2  
 NOTIFYICONDATA data; mHm"QBa!  
 data.cbSize=sizeof(NOTIFYICONDATA); q0Hor   
 data.hWnd=GetSafeHwnd(); 0gR!W3dh  
 data.uID=98; D*Cn!v$  
 Shell_NotifyIcon(NIM_DELETE,&data); 7Vn;LW  
 ShowWindow(SW_SHOW); 'zEmg}  
 SetForegroundWindow(); !)Y T_ib  
 ShowWindow(SW_SHOWNORMAL); O}Ipg[h  
 bTray=FALSE; r#% e$  
} dB{VY+!  
7S +YQ$_  
void CCaptureDlg::OnChange() tAI<[M@  
{ D7 D:?VoR  
 RegisterHotkey(); |f :1Br  
} 4x`.nql  
7K 8tz}  
BOOL CCaptureDlg::RegisterHotkey() "sM 3NY  
{ R-L*N$@!  
 UpdateData(); C J@G8>  
 UCHAR mask=0; Rxg ^vM*  
 UCHAR key=0; l*v6U'J  
 if(m_bControl) F%Xj'=  
  mask|=4; 7a,/DI2o  
 if(m_bAlt) _(qU%B  
  mask|=2; !| G 8b'  
 if(m_bShift) &jg..R  
  mask|=1; =i`#0i2(  
  key=Key_Table[m_Key.GetCurSel()]; 8?YWE62  
 if(bRegistered){ U{8]TEv  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); %ut^ O  
  bRegistered=FALSE; NZP>aV-  
 } ~ AU!Gm.  
 cMask=mask; }i)^?@  
 cKey=key; 4Jf6uhaE  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 4iDlBs+  
 return bRegistered; .L#xX1qr  
} @@?P\jv~  
L.cGt"{  
  四、小结 ~{8X$xs  
,%bG]5  
  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