/// <summary>
/// 计算指定文件的MD5值
/// </summary>
/// <param name="file">文件名</param>
/// <returns>文件的MD5值(若出现异常则返回null)</returns>
private byte[] _Get_File_MD5(string file)
{
byte[] ret = null;
var csp = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] buffer = new byte[STREAM_BUFFER_SIZE];
csp.Initialize();
FileInfo fi = new FileInfo(file);
FileStream fs = null;
try
{
fs = fi.OpenRead();
}
catch (Exception)
{
return ret;
}
//构造MD5计算事件的参数
File_MD5_Calculate_Event_Arg e = new File_MD5_Calculate_Event_Arg();
e.Current_Position = 0;
e.File_Extension = fi.Extension;
e.Full_File_Name = fi.FullName;
e.File_Length = fi.Length;
e.File_Name = fi.Name;
if (File_MD5_Begin_Calculate_Event != null)
File_MD5_Begin_Calculate_Event(e);
//读取文件计算MD5
try
{
fs = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read);
int nRead = 0;
do
{
nRead = fs.Read(buffer, 0, STREAM_BUFFER_SIZE);
csp.TransformBlock(buffer, 0, nRead, buffer, 0);
e.Current_Position += nRead;
if (File_MD5_Calculating_Event != null)
File_MD5_Calculating_Event(e);
} while (nRead != 0);
csp.TransformFinalBlock(buffer, 0, 0);
ret = csp.Hash;
}
finally
{
try
{
fs.Close();
}
catch (Exception)
{
}
csp.Clear();
}
if (File_MD5_End_Calculate_Event != null)
File_MD5_End_Calculate_Event(e);
return ret;
}
/// <summary>
/// 计算指定文件的MD5值
/// </summary>
/// <param name="file">文件名</param>
/// <returns>文件的MD5值(若出现异常则返回null)</returns>
private byte[] _Get_File_MD5(string file)
{
byte[] ret = null;
var csp = new System.Security.Cryptography.MD5CryptoServiceProvider();
byte[] buffer = new byte[STREAM_BUFFER_SIZE];
csp.Initialize();
FileInfo fi = new FileInfo(file);
FileStream fs = null;
try
{
fs = fi.OpenRead();
}
catch (Exception)
{
return(ret);
}
//构造MD5计算事件的参数
File_MD5_Calculate_Event_Arg e = new File_MD5_Calculate_Event_Arg();
e.Current_Position = 0;
e.File_Extension = fi.Extension;
e.Full_File_Name = fi.FullName;
e.File_Length = fi.Length;
e.File_Name = fi.Name;
if (File_MD5_Begin_Calculate_Event != null)
{
File_MD5_Begin_Calculate_Event(e);
}
//读取文件计算MD5
try
{
fs = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read);
int nRead = 0;
do
{
nRead = fs.Read(buffer, 0, STREAM_BUFFER_SIZE);
csp.TransformBlock(buffer, 0, nRead, buffer, 0);
e.Current_Position += nRead;
if (File_MD5_Calculating_Event != null)
{
File_MD5_Calculating_Event(e);
}
} while (nRead != 0);
csp.TransformFinalBlock(buffer, 0, 0);
ret = csp.Hash;
}
finally
{
try
{
fs.Close();
}
catch (Exception)
{
}
csp.Clear();
}
if (File_MD5_End_Calculate_Event != null)
{
File_MD5_End_Calculate_Event(e);
}
return(ret);
}
