void CCOMTOOLDlg: : OnButtonXiantu () 
{
CPaintDC dc (this); 
CRect the rect. 
GetDlgItem (IDC_STATIC_PAINT) - & gt; GetClientRect (the rect); 
The CWnd * pWnd=GetDlgItem (IDC_STATIC_PAINT); 
The CDC * pDC=pWnd - & gt; GetDC (); 
PWnd - & gt; Invalidate (). 
PWnd - & gt; UpdateWindow (); 
PDC - & gt; SetMapMode (MM_ANISOTROPIC); 
PDC - & gt; SetViewportOrg (0, 0); 
PDC - & gt; SetViewportExt (the rect. Right, the rect. Bottom); 
PDC - & gt; SetWindowOrg (0, 0); 
PDC - & gt; SetWindowExt (580310); 

Double w; 
Cstrings strcai; 
GetDlgItemText (IDC_EDIT_CAIYANG strcai); 
If (strcai=="") 
AfxMessageBox (" please enter the sampling interval!" ); 
The else 
W=atof (strcai); 


//double w=0.5;//set the sampling rate 
Double n=540.0/380.0; 
Double m=270.0/6.0; 
Int ns=int (360.0/w); 

The rect. Width (); 
The rect. Height (); 
Alternative nxLength//use the rect. Width (), the rect. Height () to replace nyLength 
Int nxLength=the rect. Width (); 
Int nyLength=the rect. Height (); 

Int nxDivisionNumber=18; 
Int nyDivisionNumber=5; 

Int nMeshLength; 

CString str; 
Int t; 

PDC - & gt; A Rectangle (0, 0, nxLength nyLength); 

CPen * pPenRed=new CPen;//create a brush object 
PPenRed - & gt; CreatePen (PS_SOLID, 1, RGB (0, 255));//red brush 

CPen * pPenGreen=new CPen;//create a brush object 
PPenGreen - & gt; CreatePen (PS_SOLID, 1, RGB (0255, 0));//green brush 

CPen * pPenBlue=new CPen;//create a brush object 
PPenBlue - & gt; CreatePen (PS_DOT, 1, RGB (0,0,255));//blue brush 

CPen * pPenBlack=new CPen;//create a brush object 
PPenBlack - & gt; CreatePen (PS_SOLID, 1, RGB (0, 0));//black brush 

//selected black brush, and save the current brush 
The CGdiObject * pOldPen=pDC - & gt; SelectObject (pPenBlack); 
PDC - & gt; MoveTo (30, 10);//draw the axis 
PDC - & gt; LineTo (30, nyLength - 30);//vertical axis, the (30, nyLength - 30) origin of coordinates is customer 
PDC - & gt; LineTo (nxLength - 10, nyLength - 30);//horizontal axis 

//the abscissa arrow 
PDC - & gt; MoveTo (nyLength, nxLength - 10-10-30-3); 
PDC - & gt; LineTo (nxLength - 10, nyLength - 30); 
PDC - & gt; LineTo (nyLength, nxLength - 10-10-30 + 3); 
PDC - & gt; LineTo (nyLength, nxLength - 10-10-30-3); 

//the vertical arrow 
PDC - & gt; MoveTo (27, 20); 
PDC - & gt; LineTo (30, 10); 
PDC - & gt; The LineTo (33, 20); 
PDC - & gt; The LineTo (27, 20); 

//abscissa number 
NMeshLength=(nxLength - 40)/(nxDivisionNumber + 1); 
For (t=0; tSTR. The Format (" % d ", t * 20); 
PDC - & gt; TextOut ((27 + t * nMeshLength), nyLength - 27, STR); 
} 

//abscissa logo 
STR. The Format (" Angle "); 
PDC - & gt; TextOut (nxLength - 33, nyLength - 27, STR); 

//ordinate number 
NMeshLength=(nyLength - 40)/(nyDivisionNumber + 1); 
For (t=0; tSTR. The Format (" % d ", t); 
PDC - & gt; TextOut (3, nyLength - 40 - t * nMeshLength, STR); 
} 

//ordinate logo 
STR. The Format (" voltage value "); 
PDC - & gt; TextOut (1, 3, STR); 

//grid lines 
PDC - & gt; SelectObject (pPenBlue); 

NMeshLength=(nxLength - 40)/(nxDivisionNumber + 1); 
For (t=1; tPDC - & gt; MoveTo (30 + t * nMeshLength nyLength - 30); 
PDC - & gt; LineTo (30 + t * nMeshLength, 10); 
} 

NMeshLength=(nyLength - 40)/(nyDivisionNumber + 1); 
For (t=1; tPDC - & gt; MoveTo (30, nyLength - 30 - t * nMeshLength); 
PDC - & gt; LineTo (nxLength - 10, nyLength - 30 - t * nMeshLength); 
} 
//TODO: Add your the control notification handler code here 
//cstrings stredit; 
//GetDlgItem (IDC_EDIT_OPEN) - & gt; GetWindowText (stredit); 
Cstrings strdata1 strdata2, strdata3 strdata4;//used to temporarily store the interception of column values 
Int index; 
int i=0; 
Int line=0;//record line number 

Double * data1; 
Data1=new double (ns);//store the first column the results 
Double * data2; 
Data2=new double (ns);//store the second column the results 
Double * data3; 
Data3=new double (ns);//store the third column the results 
Double * data4; 
Data4=new double (ns);//store the fourth column results 
//read a line of content in strLine 
//int nLineCount=m_Receive. GetLineCount (); 
Int nLineCount=m_open. GetLineCount ();//get edit control the number of rows 

Cstrings strText linebuf; 
//Dump every line of the text of the edit control. 
for (i=1; I & lt; NLineCount; I++) 
{
//the length of the line I: 
//int len=m_Receive. LineLength (m_Receive. LineIndex (I)); 
Int len=m_open. LineLength (m_open LineIndex (I));//LineLength edit control the length of the boc, LineIndex gain in a multiline edit control line character index 
//m_Receive GetLine (I, strText GetBuffer (len), len); 
M_open. GetLine (I, strText. GetBuffer (len), len);//Getline gain edit control line 
StrText. ReleaseBuffer (len);//ReleaseBuffer release GetBuffer allocation of dynamic memory 
//linebuf. The Format (_T (" line % d: '% s' \ n "), I, strText); 
Linebuf. The Format (_T (" % s \ n "), strText); 
//AfxMessageBox (linebuf); 

//AFXDUMP (linebuf);//output data row 

//to get to the first TAB key index 
The index=strText. FindOneOf (TEXT (" ")); 
//in the first column data 
Strdata1=strText. Left (8); 
//after take to delete the content 
StrText. Delete (0, index); 
//remove space 
StrText. TrimLeft (); 
The index=strText. FindOneOf (TEXT (" ")); 
//after take to delete the content 
StrText. Delete (0, index); 
//remove space 
StrText. TrimLeft (); 

//the second column data 
nullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnullnull