简单问题：进程（copy或load文件时）怎样控制？

[lwp]

delphi在进行各种费时操作时要用到进程条，现在对控件本身以掌握，但在具体控制中不知道怎么用，请各位大虾赐教。

[IAmKylix]

问题看不懂！

[meijg]

给你的例子
procedure TMainForm.btnCopyClick(Sender: TObject);
var
SrcFile, DestFile: File;
BytesRead, BytesWritten, TotalRead: Integer;
Buffer: array[1..500] of byte;
FSize: Integer;
begin
{ Assign both the source and destination files to their
respective file variables }
AssignFile(SrcFile, 'srcfile.tst');
AssignFile(DestFile, 'destfile.tst');
// Open the source file for read access.
Reset(SrcFile, 1);
try
// Open destination file for write access.
Rewrite(DestFile, 1);
try
{ Encapsulate this into a try..except so that we can erase the file if
an error occurs. }
try
// Initialize total bytes read to zero.
TotalRead := 0;
// Obtain the filesize of the source file
FSize := FileSize(SrcFile);
{ Read SizeOf(Buffer) bytes from the source file
and add these bytes to the destination file. Repeat this
process until all bytes have been read from the source
file. A progress bar is provided to show the progress of the
copy operation. }
repeat
BlockRead(SrcFile, Buffer, SizeOf(Buffer), BytesRead);
if BytesRead > 0 then
begin
BlockWrite(DestFile, Buffer, BytesRead, BytesWritten);
if BytesRead <> BytesWritten then
raise Exception.Create('Error copying file')
else begin
TotalRead := TotalRead + BytesRead;
prbCopy.Position := Trunc(TotalRead / Fsize) * 100;
prbCopy.Update;
end;
end
until BytesRead = 0;
except
{ On an exception, erase the destination file as it may be
corrupt. Then re-raise the exception. }
Erase(DestFile);
raise;
end;
finally
CloseFile(DestFile); // Close the destination file.
end;
finally
CloseFile(SrcFile); // Close the source file.
end;
end;

[lwp]

copy和load文件时等待时间长，想加一个进度条用于显示copy 和 load 的进度，不知道怎样控制。

[meijg]

先读取文件的大小，然后设置一个全局变量，为当前读到的文件大小，用它除以文件大小就得到进程条的实际参数了，在设置进程条的位置