C#将字符串复制到字节缓冲区 [英] C# copy string to byte buffer
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问题描述
我正在尝试将Ascii字符串复制到字节数组,但是无法执行。
I am trying to copy an Ascii string to a byte array but am unable. How?
这是到目前为止我尝试过的两件事。都不起作用:
Here are the two things I have tried so far. Neither one works:
public int GetString (ref byte[] buffer, int buflen)
{
string mystring = "hello world";
// I have tried this:
System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
buffer = encoding.GetBytes(mystring);
// and tried this:
System.Buffer.BlockCopy(mystring.ToCharArray(), 0, buffer, 0, buflen);
return (buflen);
}
推荐答案
如果缓冲区足够大,您可以直接将其编写:
If the buffer is big enough, you can just write it directly:
encoding.GetBytes(mystring, 0, mystring.Length, buffer, 0)
但是,您可能需要先检查长度;一个测试可能是:
However, you might need to check the length first; a test might be:
if(encoding.GetMaxByteCount(mystring.length) <= buflen // cheapest first
|| encoding.GetByteCount(mystring) <= buflen)
{
return encoding.GetBytes(mystring, 0, mystring.Length, buffer, 0)
}
else
{
buffer = encoding.GetBytes(mystring);
return buffer.Length;
}
之后,无事可做,因为您已经通过 ref
传递了 buffer
。就我个人而言,我怀疑,但是这个 ref
是一个错误的选择。除非您是从头开始复制,即
after that, there is nothing to do, since you are already passing buffer
out by ref
. Personally, I suspect that this ref
is a bad choice, though. There is no need to BlockCopy
here, unless you were copying from a scratch buffer, i.e.
var tmp = encoding.GetBytes(mystring);
// copy as much as we can from tmp to buffer
Buffer.BlockCopy(tmp, 0, buffer, 0, buflen);
return buflen;
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