Summary:

VB Signature:

    <DllImport("OleAut32.dll", EntryPoint:="OleCreatePictureIndirect", CharSet:=CharSet.Ansi, ExactSpelling:=True, PreserveSig:=True)>
    Private Function OleCreatePictureIndirect(ByRef pictdesc As PICTDESC, ByRef riid As Guid, fOwn As Boolean, <MarshalAs(UnmanagedType.IDispatch)> ByRef lplpvObj As Object) As Integer
    End Function

User-Defined Types:

    <StructLayout(LayoutKind.Sequential)>
    Friend Structure PICTDESC
    Public SizeOfStruct As Integer
    Public PicType As Integer
    Public Hbitmap As IntPtr
    Public Hpal As IntPtr
    Public Padding As Integer
    Public Sub New(hBmp As IntPtr)
        SizeOfStruct = Marshal.SizeOf(GetType(PICTDESC))
        PicType = 1
        Hbitmap = hBmp
        Hpal = IntPtr.Zero
        Padding = 0
    End Sub
    End Structure

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

Though this function is undoubtedly useful for other purposes, I have only seen it used to convert managed image types to the type required for use in custom Office ribbons.

Tips & Tricks:

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Sample Code:

    <DllImport("OleAut32.dll", EntryPoint:="OleCreatePictureIndirect", CharSet:=CharSet.Ansi, ExactSpelling:=True, PreserveSig:=True)>
    Private Function OleCreatePictureIndirect(ByRef pictdesc As PICTDESC, ByRef riid As Guid, fOwn As Boolean, <MarshalAs(UnmanagedType.IDispatch)> ByRef lplpvObj As Object) As Integer
    End Function

    <StructLayout(LayoutKind.Sequential)>
    Friend Structure PICTDESC
    Public SizeOfStruct As Integer
    Public PicType As Integer
    Public Hbitmap As IntPtr
    Public Hpal As IntPtr
    Public Padding As Integer
    Public Sub New(hBmp As IntPtr)
        SizeOfStruct = Marshal.SizeOf(GetType(PICTDESC))
        PicType = 1
        Hbitmap = hBmp
        Hpal = IntPtr.Zero
        Padding = 0
    End Sub
    End Structure

    Public Function ImageToPictureDisp(Input As Bitmap) As stdole.IPictureDisp
    Dim PictDesc As PICTDESC = New PICTDESC(Input.GetHbitmap())
    Dim Pic As Object = Nothing
    OleCreatePictureIndirect(PictDesc, GetType(stdole.IPictureDisp).GUID, True, Pic)
    Return CType(Pic, stdole.IPictureDisp)
    End Function

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