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procedure TForm1.Button1Click(Sender: TObject);const FName = 'about.txt'; // use a file larger than 2048 bytes to make it interesting.var F: File; MyData: array[1..2048] of byte; BytesRead: LongInt;begin AssignFile(F, FName); try Reset(F, 1); ProgressBar1.Max := FileSize(F); if (ProgressBar1.Max > 10) then begin // amount to move when StepIt method called ProgressBar1.Step := ProgressBar1.Max div 10; ProgressBar1.Step := Min(ProgressBar1.Step, 2048); end else ProgressBar1.Step := ProgressBar1.Max; while (ProgressBar1.Position < ProgressBar1.Max) do begin // read one Step size chunk of data to buffer BlockRead(F, MyData, ProgressBar1.Step, BytesRead); // move the ProgressBar Position using StepIt ProgressBar1.StepIt; // move by Step amount // Do this or the read will wrap and start over! ProgressBar1.Step := Min(ProgressBar1.Step, ProgressBar1.Max - ProgressBar1.Position);
end; finally; CloseFile(F); end;end; 相关阅读 >>
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