Question

delphi的 memo1.PaintTo()方法能干什么？

看不懂英文HELP。请大侠们举个例子说说。

Answer 1

就是把这个控件画到某个Device Content（在Delphi里，你可以理解为Canvas）上面。
procedure TForm1.Button1Click(Sender:TObject);

var
I, Start, Stop: Integer;
begin
PrintDialog1.Options := [poPageNums, poSelection];
PrintDialog1.FromPage := 1;
PrintDialog1.MinPage := 1;
PrintDialog1.ToPage := PageControl1.PageCount;
PrintDialog1.MaxPage := PageControl1.PageCount;
if PrintDialog1.Execute then
begin
{ determine the range the user wants to print }
with PrintDialog1 do
begin
if PrintRange = prAllPages then

begin
Start := MinPage - 1;
Stop := MaxPage - 1;
end
else if PrintRange = prSelection then
begin
Start := PageControl1.ActivePage.PageIndex;
Stop := Start;
end
else { PrintRange = prPageNums }
begin
Start := FromPage - 1;
Stop := ToPage - 1;
end;
end;
{ now, print the pages }

with Printer do
begin
BeginDoc;
for I := Start to Stop do
begin
PageControl1.Pages[I].PaintTo(Handle, 10, 10);
if I <> Stop then
NewPage;
end;
EndDoc;
end;
end;

end;