/// <summary>获取文件的md5校验码</summary>
public static string GetMD5HashFromFile(string fileName)
{
if (string.IsNullOrEmpty(fileName))
{
return(null);
}
try
{
if (File.Exists(fileName))
{
FileStream file = File.OpenRead(fileName);
MD5 md5 = new MD5CryptoServiceProvider();
byte[] retVal = md5.ComputeHash(file);
file.Close();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < retVal.Length; i++)
{
sb.Append(retVal[i].ToString("x2"));
}
return(sb.ToString());
}
return(null);
}
catch (Exception e)
{
DSLog.E(e.ToString(), false);
return(null);
}
}
/// <summary>采用GBK编码缩减字符串到指定字节长度，超出部分使用指定文本代替</summary>
public static string ReduceStringToLength(string str, int length, string replaceTxt = "...")
{
try
{
int byteCount = GetStringLengthByGBK(str);
if (byteCount > length)
{
length -= 2; //超出指定长度，则缩减2个字节，使用"..."结尾
while (byteCount > length)
{
str = str.Substring(0, str.Length - 1);
byteCount = GetStringLengthByGBK(str);
}
return(str + replaceTxt);
}
else
{
return(str);
}
}
catch (Exception e)
{
DSLog.I(e.ToString());
return(str);
}
}
/// <summary> 在指定目录下创建二进制文件</summary>
public static bool CreateBytesFile(string filePath, byte[] bytes)
{
try
{
string directory = Path.GetDirectoryName(filePath);
if (!Directory.Exists(directory))
{
Directory.CreateDirectory(directory);
}
File.WriteAllBytes(filePath, bytes);
return(true);
}
catch (Exception e)
{
DSLog.E("创建文件失败：" + e.ToString(), false);
return(false);
}
}