请问如何在TChart中使用曲线趋势图(Fast Line)? sStudyPhase:=Trim(RzComboBoxYear.text)+'年'+Trim(RzComboBoxStudyPhase.text);
sStudyPhase:=sStudyPhase+'就业情况趋势图';
DBChart1.Title.Text.Clear;
DBChart1.Title.Text.Add(sStudyPhase);
DBChart1.SeriesList.Series[0].Clear;
if mpXMLDataSet1.Active=false then Exit;
mpXMLDataSet1.First;
K:=1;
While not mpXMLDataSet1.Eof do begin
try
sFieldName:=mpXMLDataSet1.fieldbyname('统计年月').AsString;
iTemp:=mpXMLDataSet1.fieldbyname('签约人数').AsInteger;
DBChart1.SeriesList.Series[0].Add(iTemp,sFieldName,$00000000+k*$36);
finally
k:=K*366;
mpXMLDataSet1.Next;
end;
end;这段代码哪里有问题吗?
为何总是报Invalid pointer operation?
sStudyPhase:=sStudyPhase+'就业情况趋势图';
DBChart1.Title.Text.Clear;
DBChart1.Title.Text.Add(sStudyPhase);
DBChart1.SeriesList.Series[0].Clear;
if mpXMLDataSet1.Active=false then Exit;
mpXMLDataSet1.First;
K:=1;
While not mpXMLDataSet1.Eof do begin
try
sFieldName:=mpXMLDataSet1.fieldbyname('统计年月').AsString;
iTemp:=mpXMLDataSet1.fieldbyname('签约人数').AsInteger;
DBChart1.SeriesList.Series[0].Add(iTemp,sFieldName,$00000000+k*$36);
finally
k:=K*366;
mpXMLDataSet1.Next;
end;
end;这段代码哪里有问题吗?
为何总是报Invalid pointer operation?
procedure TForm1.BitBtn1Click(Sender: TObject);
var
sStudyPhase : string;
i : integer;
begin
sStudyPhase:=Trim('1999')+'年'+Trim('20');
sStudyPhase:=sStudyPhase+'就业情况趋势图';
Chart1.Title.Text.Clear;
Chart1.Title.Text.Add(sStudyPhase);
Chart1.SeriesList.Series[0].Clear;
{
if mpXMLDataSet1.Active=false then Exit;
mpXMLDataSet1.First;
K:=1;
While not mpXMLDataSet1.Eof do begin
try
sFieldName:=mpXMLDataSet1.fieldbyname('统计年月').AsString;
iTemp:=mpXMLDataSet1.fieldbyname('签约人数').AsInteger;
DBChart1.SeriesList.Series[0].Add(iTemp,sFieldName,$00000000+k*$36);
finally
k:=K*366;
mpXMLDataSet1.Next;
end;
end; }
for i := 0 to 100 do
begin
Chart1.SeriesList.Series[0].Add(199,'abc',$00000000+1*$36)
end;
end;