C# 使用流编写器将特定字节写入文本文件
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using Stream writer to Write a specific bytes to textfile
提问by user2799605
Well I'm trying to write some values and strings to a text file.
but this text file must contain 2 bytes
好吧，我正在尝试将一些值和字符串写入文本文件。
但此文本文件必须包含 2 个字节
These are the 2 bytes I want to insert to my text file after finishing writing the other values to it:
这些是我想在完成写入其他值后插入到我的文本文件的 2 个字节：
I tried this method but I have no idea how to write bytes through it
我试过这个方法，但我不知道如何通过它写字节
using (StreamWriter sw = new StreamWriter(outputFilePath, false, Encoding.UTF8))
I have no idea about how to write them to the text file after putting the strings I want on it.
在将我想要的字符串放在上面后，我不知道如何将它们写入文本文件。
采纳答案by Measuring
If I recall correctly from your question. You want to write strings to a file and then write bytes to it?
如果我从你的问题中没有记错的话。您想将字符串写入文件，然后向其中写入字节吗？
This example will do that for you:
这个例子将为你做到这一点：
using (FileStream fsStream = new FileStream("Bytes.data", FileMode.Create))
using (BinaryWriter writer = new BinaryWriter(fsStream, Encoding.UTF8))
{
// Writing the strings.
writer.Write("The");
writer.Write(" strings");
writer.Write(" I");
writer.Write(" want");
writer.Write(".");
// Writing your bytes afterwards.
writer.Write(new byte[]
{
0xff,
0xfe
});
}
When opening the "Bytes.data" file with a hex editor you should see these bytes:
使用十六进制编辑器打开“Bytes.data”文件时，您应该看到以下字节：
回答by Pellared
After saving the string simply write those bytes using for example using File.WriteAllBytes or a BinaryWriter: Can a Byte[] Array be written to a file in C#?
保存字符串后，只需使用 File.WriteAllBytes 或 BinaryWriter 写入这些字节： 可以将 Byte[] 数组写入 C# 中的文件吗？
回答by jltrem
There is a StreamWriter.Write(char)that will write a 16-bit value. You should be able to set your variable with the hex value like char val = '\xFFFE'and pass it to Write. You could also use FileStreamwhere all the Write methods work off bytes, and it specifically has a WriteByte(byte)method. The MSDN documentationfor it gives an example of outputting UTF8 text.
有一个StreamWriter.Write(char)将写入 16 位值。您应该能够使用十六进制值设置变量并将其char val = '\xFFFE'传递给Write. 您还可以使用FileStream所有 Write 方法都使用字节的地方，并且它特别有一个WriteByte(byte)方法。它的MSDN 文档给出了输出 UTF8 文本的示例。
回答by Yaniv
If I understand correctly, you're trying to write some strings to a text file, but you want to add 2 bytes to this file.
如果我理解正确，您正在尝试将一些字符串写入文本文件，但您想向该文件添加 2 个字节。
Why won't you try using: File.WriteAllBytes ?
为什么不尝试使用： File.WriteAllBytes ？
Convert your string to a Byte array using
使用将您的字符串转换为字节数组
byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(str); // If your using UTF8
Create a new byte array from the original byteArraywith the additional 2 bytes.
使用额外的 2 个字节从原始byteArray创建一个新的字节数组。
And write them to a file using:
并使用以下命令将它们写入文件：
File.WriteAllBytes("MyFile.dat", newByteArray)
回答by Bitterblue
I just figured this out. It works quite well for me. The idea is you open the file with a FileStream that can write byte arrays, and put a StreamWriter on top of it to write strings. And then you can use both to mix strings with your bytes:
我只是想通了这一点。它对我来说效果很好。这个想法是你用一个可以写入字节数组的 FileStream 打开文件，然后在它上面放一个 StreamWriter 来写入字符串。然后您可以使用两者将字符串与您的字节混合：
// StreamWriter writer = new StreamWriter(new FileStream("file.txt", FileMode.OpenOrCreate));
byte[] bytes = new byte[] { 0xff, 0xfe };
writer.BaseStream.Write(bytes, 0, bytes.Length);
回答by Rajesh Katare
Here is one more way to look for a solution...
这是寻找解决方案的另一种方法......
StringBuilder sb = new StringBuilder();
sb.Append("Hello!! ").Append(",");
sb.Append("My").Append(",");
sb.Append("name").Append(",");
sb.Append("is").Append(",");
sb.Append("Rajesh");
sb.AppendLine();
//use UTF8Encoding(true) if you want to use Byte Order Mark (BOM)
UTF8Encoding utf8withNoBOM = new UTF8Encoding(false);
byte[] bytearray;
bytearray = utf8withNoBOM.GetBytes(sb.ToString());
using (FileStream fileStream = new FileStream(System.Web.HttpContext.Current.Request.MapPath("~/" + "MyFileName.csv"), FileMode.Append, FileAccess.Write))
{
StreamWriter sw = new StreamWriter(fileStream, utf8withNoBOM);
//StreamWriter for writing bytestream array to file document
sw.BaseStream.Write(bytearray, 0, bytearray.Length);
sw.Flush();
sw.Close();
fileStream.Close();
}
