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procedure TMDIChildForm.mmiNewClick(Sender: TObject);
begin
MainForm.mmiNewClick(nil);
end;
procedure TMainForm.mmiNewClick(Sender: TObject);
begin
........
end;
请问MainForm.mmiNewClick(nil);这里为啥是nil,它起什么作用?
begin
MainForm.mmiNewClick(nil);
end;
procedure TMainForm.mmiNewClick(Sender: TObject);
begin
........
end;
请问MainForm.mmiNewClick(nil);这里为啥是nil,它起什么作用?