vb.net 不支持给定路径的格式

问：

我使用 ESC/P 或 Epson Standard Code for Printers，旨在加粗。但是我发现有一个错误“不支持给定路径的格式”。有没有最好的解决方案？

谢谢

不支持给定路径的格式

Dim ESC As String = "\u001B"
Dim BoldOn As String = (ESC + ("E" + "\u0001"))
Dim BoldOff As String = (ESC + ("E" + "\0"))
 Public Shared Function SendFileToPrinter(ByVal szPrinterName As String, ByVal szFileName As String) As Boolean
        ' Open the file.
        Using fs As New FileStream(szFileName, FileMode.Open)
            ' Create a BinaryReader on the file.
            Dim br As New BinaryReader(fs)

            ' Dim an array of bytes big enough to hold the file's contents.
            Dim bytes(fs.Length - 1) As Byte
            Dim bSuccess As Boolean = False
            ' Your unmanaged pointer.
            Dim pUnmanagedBytes As New IntPtr(0)
            Dim nLength As Integer

            nLength = Convert.ToInt32(fs.Length)
            ' Read the contents of the file into the array.
            bytes = br.ReadBytes(nLength)
            ' Allocate some unmanaged memory for those bytes.
            pUnmanagedBytes = Marshal.AllocCoTaskMem(nLength)
            ' Copy the managed byte array into the unmanaged array.
            Marshal.Copy(bytes, 0, pUnmanagedBytes, nLength)
            ' Send the unmanaged bytes to the printer.
            bSuccess = SendBytesToPrinter(szPrinterName, pUnmanagedBytes, nLength)
            ' Free the unmanaged memory that you allocated earlier.
            Marshal.FreeCoTaskMem(pUnmanagedBytes)
            Return bSuccess
        End Using
    End Function
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim printer As String = "Generic / Text Only"
        For i As Integer = 1 To 1
            SendFileToPrinter(printer, (BoldOn + ("C:\vDos\#LPT1.asc" + BoldOff)))
'SendFileToPrinter(printer, "C:\vDos\#LPT1.asc") if I use this code then the error does not appear 
        Next i
  
    End Sub