C#•9mo ago

StreamReader is always EndOfStream=true even before reading

//var response = httpClient.GetAsync(url);

using (var fs = new FileStream("000000_0.deflate", FileMode.Open))
{
    //await response.Result.Content.CopyToAsync(fs);
    using (var deflate = new ZLibStream(fs, CompressionMode.Decompress, true))
    using (var reader = new StreamReader(deflate, Encoding.ASCII))
    {
        messages.Add($"EOS: {reader.EndOfStream}");

//var response = httpClient.GetAsync(url);

using (var fs = new FileStream("000000_0.deflate", FileMode.Open))
{
    //await response.Result.Content.CopyToAsync(fs);
    using (var deflate = new ZLibStream(fs, CompressionMode.Decompress, true))
    using (var reader = new StreamReader(deflate, Encoding.ASCII))
    {
        messages.Add($"EOS: {reader.EndOfStream}");

So this code works when I run locally with a file name hard coded in. When I instead download the the file and load it into a FileStream, it's always at EndOfStream. Am I doing something wrong? Here's what the code would look like in the way it's NOT working:

var url = $"http://url.to.download/{fileName}";
var response = httpClient.GetAsync(url);

using (var fs = new FileStream(_fileDir + fileName, FileMode.Create))
{
    await response.Result.Content.CopyToAsync(fs);
    using (var deflate = new ZLibStream(fs, CompressionMode.Decompress, true))
    using (var reader = new StreamReader(deflate, Encoding.ASCII))
    {
        messages.Add($"EOS: {reader.EndOfStream}");

var url = $"http://url.to.download/{fileName}";
var response = httpClient.GetAsync(url);

using (var fs = new FileStream(_fileDir + fileName, FileMode.Create))
{
    await response.Result.Content.CopyToAsync(fs);
    using (var deflate = new ZLibStream(fs, CompressionMode.Decompress, true))
    using (var reader = new StreamReader(deflate, Encoding.ASCII))
    {
        messages.Add($"EOS: {reader.EndOfStream}");

8 Replies

RelevantOP•9mo ago

is the CopyToAsync forcing it to the EOS? Looks like that might have been it. I closed the FileStream after copying, then opened a new FileStream to read the newly created file Seems a bit redundant, but I guess necessary?

Jimmacle•9mo ago

copying implies reading the whole stream, so it makes sense it would be at the end afterwards you can probably seek it back to the beginning instead of closing and reopening the file

RelevantOP•9mo ago

Yeah make sense. Thanks

leowest•9mo ago

also since you're using await, use it on the getasync as well.

var response = await httpClient.GetAsync(url);

var response = await httpClient.GetAsync(url);

and

await response.Content.CopyToAsync(fs);

await response.Content.CopyToAsync(fs);

RelevantOP•9mo ago

why? I don't need to wait for that to complete until the copy

leowest•9mo ago

what if your request failed? among other issues that can happen in between

RelevantOP•9mo ago

leowest•9mo ago

there is 2 separate awaits there one for the request header the other for the content

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StreamReader is always EndOfStream=true even before reading