运行时怎么调整个DBGrid的宽度

写一个函数来自动调整dbGrid的列宽：
函数如下：
//使dbGrid的内容自动适应他的宽度
procedure MakeDBGridColumnsAutoFixItsWidth(objDBGrid:TDBGrid);
var
cc:integer;
i,tmpLength:integer;
objDataSet:TDataSet;
aDgCLength:array of integer;
begin
cc:=objDbGrid.Columns.Count-1;
objDataSet:=objDbGrid.DataSource.DataSet;
setlength(aDgCLength,cc+1);
file://取标题字段的长度
for i:=0 to cc do
begin
aDgCLength[i]:= length(objDbGrid.Columns[i].Title.Caption);
end;
objDataSet.First;
while not objDataSet.Eof do
begin
file://取列中每个字段的长度
for i:=0 to cc do
begin
tmpLength:=length(objDataSet.Fields.Fields[i].AsString);
if tmpLength>aDgCLength[i]
then aDgCLength[i]:=tmpLength;
end;
objDataSet.Next;
end;
for i:=0 to cc do
begin
objDbGrid.Columns[i].Width:=aDgCLength[i]*7;
end;
end;