[英]Save hex datas of .mjpeg file as a .mjpeg formatted file in C#
I have a text file filled with hex datas(like "FFD8FE00..") of a .mjpeg formatted file. 我有一个文本文件,里面装有.mjpeg格式文件的十六进制数据(例如“ FFD8FE00 ..”)。 I have to play it with a converter.
我必须和转换器一起玩。 So, i am trying to write the data in a .mjpeg file with these lines:
因此,我正在尝试使用以下行将数据写入.mjpeg文件中:
string myData = File.ReadAllText("hexData.txt");
string newData;
int remainder = myData.Length%500;
byte[] data_toWrite=newByte[250];
for(int i=0;i<myData.Length-remainder; i+=500)
{
newData = myData.Substring(i,500);
data_toWrite = StringToByteArray(newData);
File.WriteAllBytes("video.mjpeg",data_toWrite);
}
newData = myData.Substring(myData.Length-remainder,remainder);
data_toWrite = StringToByteArray(newData);
File.WriteAllBytes("video.mjpeg",data_toWrite);
public static byte[] StringToByteArray(String hex)
{
int NumberChars = hex.Length;
byte[] bytes = new byte[NumberChars / 2];
for (int i = 0; i < NumberChars; i += 2)
bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
return bytes;
}
But i couldn't make it play. 但我无法发挥作用。 I don't know where I am wrong at.
我不知道我在哪里错。 I tried to convert newData to ascii then byte array but it failed,too.
我试图将newData转换为ascii然后是字节数组,但是它也失败了。
Any ideas,many thanks! 任何想法,非常感谢!
Kane 凯恩
This 这个
File.WriteAllBytes("video.mjpeg",data_toWrite);
overwrites the file every time, not appends. 每次都覆盖文件,而不是追加。
I'm sure better code can be written, but this should be enough: 我确信可以编写更好的代码,但这应该足够了:
string input = "test.hex";
string output = "output.bin";
using (var sr = new StreamReader(input))
using (var fs = File.Create(output))
{
// We accumulate the 2 hex digits needed for a byte here
string h = string.Empty;
while (true)
{
int ch1 = sr.Read();
if (ch1 == -1)
{
// The file finished but we have a pending partial hex code
if (h.Length == 1)
{
throw new Exception("Malformed file");
}
break;
}
char ch2 = (char)ch1;
// Skip white space and end-of-line
if (char.IsWhiteSpace(ch2))
{
continue;
}
h += ch2;
// We have collected 2 hex digits, so we have 1 byte
if (h.Length == 2)
{
byte b = Convert.ToByte(h, 16);
fs.WriteByte(b);
h = string.Empty;
}
}
}
Note that both StreamReader
and File.Create
(that returns a FileStream
) do some buffering, so no explicit buffering is needed. 请注意,
StreamReader
和File.Create
(返回FileStream
)都进行一些缓冲,因此不需要显式缓冲。 My hands are quivering because they want to remove the string h
buffer and do the parsing hex digit by hex digit directly in the byte b
. 我的手在颤抖,因为他们想删除
string h
缓冲区并直接在byte b
逐个进行十六进制数字解析。 But I'll try to not overcomplicate the code :-) 但是我将尽量不使代码过于复杂:-)
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