我正在尝试将 Ascii 字符串复制到字节数组,但无法。如何?
这是我迄今为止尝试过的两件事。两者都不起作用:
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);
}
如果缓冲区足够大,可以直接写入:
encoding.GetBytes(mystring, 0, mystring.Length, buffer, 0)
但是,您可能需要先检查长度;测试可能是:
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,有没事做,因为你已经通过了buffer
out by ref
。就我个人而言,我suspect那个这个ref
不过,这是一个糟糕的选择。没有必要BlockCopy
在这里,除非您从临时缓冲区复制,即
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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