/// <summary>
/// Starts a new trace log file with the given session name writing it to the specified file.
///
/// If a session name is not provided a unique name will be generated
/// </summary>
/// <param name="sessionName"></param>
/// <param name="filename"></param>
/// <returns></returns>
public static TraceLog Start(string filename, string sessionName = null) {
if (sessionName == null) {
sessionName = Guid.NewGuid().ToString();
}
var bufferSize = Marshal.SizeOf(typeof(EVENT_TRACE_PROPERTIES)) +
(sessionName.Length + 1) * 2 +
(filename.Length + 1) * 2;
var mem = Marshal.AllocHGlobal(bufferSize);
for (int i = 0; i < bufferSize; i++) {
Marshal.WriteByte(mem, i, 0);
}
if (mem == IntPtr.Zero) {
throw new OutOfMemoryException();
}
EVENT_TRACE_PROPERTIES eventProps = new EVENT_TRACE_PROPERTIES();
eventProps.Wnode.BufferSize = (uint)bufferSize;
eventProps.BufferSize = 512;
eventProps.Wnode.Guid = Guid.NewGuid();
eventProps.LogFileMode = EVENT_TRACE_PRIVATE_IN_PROC | EVENT_TRACE_PRIVATE_LOGGER_MODE | EVENT_TRACE_FILE_MODE_SEQUENTIAL;
eventProps.MaximumFileSize = 0;
eventProps.Wnode.Flags = EtlNativeMethods.WNODE_FLAG_TRACED_GUID;
eventProps.Wnode.TimeStamp = 0;
eventProps.Wnode.ClientContext = 0;
eventProps.LoggerNameOffset = (uint)Marshal.SizeOf(typeof(EVENT_TRACE_PROPERTIES));
eventProps.LogFileNameOffset = (uint)(Marshal.SizeOf(typeof(EVENT_TRACE_PROPERTIES)) + (sessionName.Length + 1) * 2);
Marshal.StructureToPtr(eventProps, mem, false);
int offset = (int)eventProps.LogFileNameOffset;
for (int i = 0; i < filename.Length; i++, offset += 2) {
Marshal.WriteInt16(mem, offset, filename[i]);
}
Marshal.WriteInt16(mem, offset, 0);
bool success = false;
try {
ulong handle;
var error = EtlNativeMethods.StartTraceW(
out handle,
sessionName,
mem
);
if (error != 0) {
throw new Win32Exception((int)error);
}
var res = new TraceLog(handle, sessionName, mem);
success = true;
return res;
} finally {
if (!success) {
Marshal.FreeHGlobal(mem);
}
}
}
/// <summary>
/// Starts a new trace log file with the given session name writing it to the specified file.
///
/// If a session name is not provided a unique name will be generated
/// </summary>
/// <param name="sessionName"></param>
/// <param name="filename"></param>
/// <returns></returns>
public static TraceLog Start(string filename, string sessionName = null)
{
if (sessionName == null)
{
sessionName = Guid.NewGuid().ToString();
}
var bufferSize = Marshal.SizeOf(typeof(EVENT_TRACE_PROPERTIES)) +
(sessionName.Length + 1) * 2 +
(filename.Length + 1) * 2;
var mem = Marshal.AllocHGlobal(bufferSize);
for (int i = 0; i < bufferSize; i++)
{
Marshal.WriteByte(mem, i, 0);
}
if (mem == IntPtr.Zero)
{
throw new OutOfMemoryException();
}
EVENT_TRACE_PROPERTIES eventProps = new EVENT_TRACE_PROPERTIES();
eventProps.Wnode.BufferSize = (uint)bufferSize;
eventProps.BufferSize = 512;
eventProps.Wnode.Guid = Guid.NewGuid();
eventProps.LogFileMode = EVENT_TRACE_PRIVATE_IN_PROC | EVENT_TRACE_PRIVATE_LOGGER_MODE | EVENT_TRACE_FILE_MODE_SEQUENTIAL;
eventProps.MaximumFileSize = 0;
eventProps.Wnode.Flags = EtlNativeMethods.WNODE_FLAG_TRACED_GUID;
eventProps.Wnode.TimeStamp = 0;
eventProps.Wnode.ClientContext = 0;
eventProps.LoggerNameOffset = (uint)Marshal.SizeOf(typeof(EVENT_TRACE_PROPERTIES));
eventProps.LogFileNameOffset = (uint)(Marshal.SizeOf(typeof(EVENT_TRACE_PROPERTIES)) + (sessionName.Length + 1) * 2);
Marshal.StructureToPtr(eventProps, mem, false);
int offset = (int)eventProps.LogFileNameOffset;
for (int i = 0; i < filename.Length; i++, offset += 2)
{
Marshal.WriteInt16(mem, offset, filename[i]);
}
Marshal.WriteInt16(mem, offset, 0);
bool success = false;
try
{
ulong handle;
var error = EtlNativeMethods.StartTraceW(
out handle,
sessionName,
mem
);
if (error != 0)
{
throw new Win32Exception((int)error);
}
var res = new TraceLog(handle, sessionName, mem);
success = true;
return(res);
}
finally
{
if (!success)
{
Marshal.FreeHGlobal(mem);
}
}
}
