如果作为单个命令执行，下面的代码可以正常工作。我用它来下载通常为几兆字节的 PDF。
但是，当我在一个循环中多次执行它时，所有下载的文件大小完全相同（截断 @ ~50KB）。我的代码有问题还是服务器无法按预期交付？
type
TKeyValuePair = record
Key: String;
Value: String;
end;
TKeyValueSet = Array of TKeyValuePair;
// ...
function TDM.MultipartPost(const URL, LocalFile: String; const MultipartData: TKeyValueSet): Boolean;
var
i: Integer;
httpclient: THTTPClient;
formdata: TMultipartFormData;
fstream: TFileStream;
begin
httpclient := THTTPClient.Create;
formdata := TMultipartFormData.Create();
fstream := nil;
try
fstream := TFileStream.Create(LocalFile, fmCreate);
except
// removed
end;
try
for i := Low(MultipartData) to High(MultipartData) do
formdata.AddField(MultipartData[i].Key, MultipartData[i].Value);
try
httpclient.Post(url, formdata, fstream);
except
// removed
end;
finally
FlushFileBuffers(fstream.Handle);
fstream.Free;
formdata.Free;
httpclient.Free;
//
Result := FileExists(LocalFile) and (GetFileSize(LocalFile) > 0);
end;
end;