我使用 Binarywriter 將 blob 資料 (PDF) 從 oracle 保存到磁盤。當我打開生成的檔案時，結果很難看。我認為其 1 個字符的問題是用一個位元組寫入。
我怎樣才能增加寫入 8。（/BitsPerComponent 8）
有任何想法嗎 ？
long CurrentIndex = 0;
int BufferSize = 10000;
long BytesReturned;
byte[] Blob = new byte[BufferSize];
OracleDataReader reader = comando.ExecuteReader(CommandBehavior.SequentialAccess);
string filepath = "C:\\ttttt.pdf";
while (reader.Read())
{
FileStream fs = new FileStream(filepath, FileMode.OpenOrCreate, FileAccess.Write);
BinaryWriter writer = new BinaryWriter(fs);
//reset the index to the beginning of the file
CurrentIndex = 0;
BytesReturned = reader.GetBytes(0, CurrentIndex, Blob, 0, BufferSize);
while (BytesReturned == BufferSize)
{
writer.Write(Blob);
writer.Flush();
CurrentIndex = BufferSize;
BytesReturned = reader.GetBytes(0, CurrentIndex, Blob, 0, BufferSize);
}
writer.Write(Blob, 0, (int)BytesReturned);
writer.Flush();
writer.Close();
fs.Close();
}
uj5u.com熱心網友回復：
為此，您不需要 BinaryWriter。只需直接寫入流。BinaryWriter 的預期用例是將原始資料型別寫入流以進行序列化。
更新：自動從Base64(MD5(Blob)).
long CurrentIndex = 0;
int BufferSize = 10000;
long BytesReturned;
byte[] Blob = new byte[BufferSize];
using (var hasher = MD5.Create())
{
using (var reader = comando.ExecuteReader(CommandBehavior.SequentialAccess))
{
while (reader.Read())
{
var filename = Convert.ToBase64String(hasher.ComputeHash(Blob)).Replace("=", string.Empty);
var filepath = Path.ChangeExtension(Path.Combine("C:\\", filename), ".pdf");
using (var fs = new FileStream(filepath, FileMode.OpenOrCreate, FileAccess.Write))
{
//reset the index to the beginning of the file
CurrentIndex = 0;
BytesReturned = reader.GetBytes(0, CurrentIndex, Blob, 0, BufferSize);
while (BytesReturned == BufferSize)
{
fs.Write(Blob, 0, Blob.Length);
CurrentIndex = BufferSize;
BytesReturned = reader.GetBytes(0, CurrentIndex, Blob, 0, BufferSize);
}
fs.Write(Blob, 0, (int)BytesReturned);
}
}
}
}
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標籤：C＃甲骨文斑点文件流