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writefile (coredll)

coredll is for smart devices, not desktop Windows. Therefore, this information only applies to code using the .NET Compact Framework. To see if information for writefile in other DLLs exists, click on Find References to the right.

TODO - a short description

C# Signature:

static extern Boolean WriteFile(IntPtr fFile, Byte[] lpBuffer, UInt32 nNumberOfBytesToWrite,
        out UInt32 lpNumberOfBytesWritten, IntPtr lpOverlapped);

VB .NET Signature:

Declare Function WriteFile Lib "coredll.dll" (TODO) As TODO

VB Signature:

Public Declare Function WriteFile Lib "coredll" ( _
    ByVal hFile As Long, _
    ByVal lpBuffer As String, _
    ByVal nNumberOfBytesToWrite As Long, _
    lpNumberOfBytesWritten As Long, _
    ByVal lpOverlapped As Long) As Long

User-Defined Types:

Public Const CREATE_ALWAYS = 2
Public Const OPEN_ALWAYS = 4
Public Const GENERIC_READ = &H80000000
Public Const GENERIC_WRITE = &H40000000
Public Const FILE_END As Long = 2



Tips & Tricks:

Please add some!

Sample Code:

Private Function WriteString(MyString As String) As Boolean
    Dim lWritten As Long
    Dim flag As Long
    Dim hFile As Long

    If optOverwrite Then
    flag = CREATE_ALWAYS
    flag = OPEN_ALWAYS
    End If

    hFile = CreateFile(txtFileName.Text, GENERIC_READ + GENERIC_WRITE, _
               0, 0, flag, 0, 0)

    If optAppend.Value Then
    SetFilePointer hFile, 0, 0, FILE_END
    End If

    If hFile <> -1 Then
    WriteFile hFile, MyString, LenB(MyString), lWritten, 0
    CloseHandle hFile
    End If
End Function

Alternative Managed API:


WriteFile on MSDN

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