API found in C# but not VB?

27 Aug 2006 2:39 AM

iwdu15

i really hope im just overlooking something very simple bc i have an API call
in VB.net that doesnt work, yet the same call in C# works....in VB i get an
error saying the Entry Point cannot be found....code below

[DllImport("setupapi.dll", SetLastError=true)]
        static extern unsafe int SetupDiGetDeviceInterfaceDetail(
            int DeviceInfoSet,
            ref SP_DEVICE_INTERFACE_DATA lpDeviceInterfaceData,
            int* aPtr,
            int detailSize,
            ref int requiredSize,
            int* bPtr);

        [DllImport("setupapi.dll", SetLastError=true)]
        static extern unsafe int SetupDiGetDeviceInterfaceDetail(
            int DeviceInfoSet,
            ref SP_DEVICE_INTERFACE_DATA lpDeviceInterfaceData,
            ref PSP_DEVICE_INTERFACE_DETAIL_DATA myPSP_DEVICE_INTERFACE_DETAIL_DATA,
            int detailSize,
            ref int requiredSize,
            int* bPtr);

SetupDiGetDeviceInterfaceDetail(
                hDevInfo,
                ref mySP_DEVICE_INTERFACE_DATA,
                null,
                DeviceInterfaceDetailDataSize,
                ref RequiredSize,
                null);

Friend Declare Function SetupDiGetDeviceInterfaceDetail Lib "setupapi.dll"
(ByVal DeviceInfoSet As Integer, _

   ByRef lpDeviceInterfaceData As SP_DEVICE_INTERFACE_DATA, _

   ByRef myPSP_DEVICE_INTERFACE_DETAIL_DATA As
PSP_DEVICE_INTERFACE_DETAIL_DATA, _

   ByVal detailSize As Integer, ByRef requiredSize As Integer, _

   ByRef bPtr As Integer) As Integer

    Friend Declare Function SetupDiGetDeviceInterfaceDetail Lib
"setupapi.dll" (ByVal DeviceInfoSet As Integer, _

   ByRef lpDeviceInterfaceData As SP_DEVICE_INTERFACE_DATA, _

   ByRef aPtr As Integer, ByVal detailSize As Integer, _

   ByRef requiredSize As Integer, ByRef bPtr As Integer) As Integer

     Dim results As Integer = SetupDiGetDeviceInterfaceDetail(hDevInfo,
myInfo, myPspInfo, DeviceInterfaceDetailDataSize, _

RequiredSize, Nothing)

--
-iwdu15

27 Aug 2006 5:04 AM

Cor Ligthert [MVP]

iwdu,

There is one big difference between C# and VB .Net. C# can handle unsafe
code.

You are sure that this is not your problem.

Cor

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"iwdu15" <jmmgoalsteratyahoodotcom> schreef in bericht
news:C48FB7AB-674E-45A4-A67A-A89665CAA2BA@microsoft.com...
>i really hope im just overlooking something very simple bc i have an API
>call
> in VB.net that doesnt work, yet the same call in C# works....in VB i get
> an
> error saying the Entry Point cannot be found....code below
>
> [DllImport("setupapi.dll", SetLastError=true)]
> static extern unsafe int SetupDiGetDeviceInterfaceDetail(
> int DeviceInfoSet,
> ref SP_DEVICE_INTERFACE_DATA lpDeviceInterfaceData,
> int* aPtr,
> int detailSize,
> ref int requiredSize,
> int* bPtr);
>
>
> [DllImport("setupapi.dll", SetLastError=true)]
> static extern unsafe int SetupDiGetDeviceInterfaceDetail(
> int DeviceInfoSet,
> ref SP_DEVICE_INTERFACE_DATA lpDeviceInterfaceData,
> ref PSP_DEVICE_INTERFACE_DETAIL_DATA myPSP_DEVICE_INTERFACE_DETAIL_DATA,
> int detailSize,
> ref int requiredSize,
> int* bPtr);
>
> SetupDiGetDeviceInterfaceDetail(
> hDevInfo,
> ref mySP_DEVICE_INTERFACE_DATA,
> null,
> DeviceInterfaceDetailDataSize,
> ref RequiredSize,
> null);
>
>
> Friend Declare Function SetupDiGetDeviceInterfaceDetail Lib "setupapi.dll"
> (ByVal DeviceInfoSet As Integer, _
>
>   ByRef lpDeviceInterfaceData As SP_DEVICE_INTERFACE_DATA, _
>
>   ByRef myPSP_DEVICE_INTERFACE_DETAIL_DATA As
> PSP_DEVICE_INTERFACE_DETAIL_DATA, _
>
>   ByVal detailSize As Integer, ByRef requiredSize As Integer, _
>
>   ByRef bPtr As Integer) As Integer
>
>    Friend Declare Function SetupDiGetDeviceInterfaceDetail Lib
> "setupapi.dll" (ByVal DeviceInfoSet As Integer, _
>
>   ByRef lpDeviceInterfaceData As SP_DEVICE_INTERFACE_DATA, _
>
>   ByRef aPtr As Integer, ByVal detailSize As Integer, _
>
>   ByRef requiredSize As Integer, ByRef bPtr As Integer) As Integer
>
>     Dim results As Integer = SetupDiGetDeviceInterfaceDetail(hDevInfo,
> myInfo, myPspInfo, DeviceInterfaceDetailDataSize, _
>
> RequiredSize, Nothing)
> --
> -iwdu15

27 Aug 2006 5:50 PM

Jay B. Harlow [MVP - Outlook]

iwdu15,
Consider using IntPtr rather then unsafe int* in your C#; as Cor suggests VB
doesn't allow unsafe per se. Instead VB relies on IntPtr & the
System.Runtime.InteropServices.Marshal class to safely do "unsafe" things...

Normally I use www.pinvoke.net to find my DllImport/Declare statements. For
example your routine taken from:

http://www.pinvoke.net/default.aspx/setupapi/SetupDiGetDeviceInterfaceDetail.html

would be:

[DllImport(@"setupapi.dll", CharSet=CharSet.Auto, SetLastError = true)]
public static extern Boolean SetupDiGetDeviceInterfaceDetail( IntPtr
hDevInfo, ref SP_DEVICE_INTERFACE_DATA deviceInterfaceData, IntPtr
deviceInterfaceDetailData, UInt32 deviceInterfaceDetailDataSize, out UInt32
requiredSize, IntPtr deviceInfoData );

Which then translates into something like (untested, manually translated):

Public Declare Auto Function SetupDiGetDeviceInterfaceDetail Lib
"setupapi.dll" (ByVal hDevInfo As IntPtr, ByRef deviceInterfaceData As
SP_DEVICE_INTERFACE_DATA, ByVal deviceInterfaceDetailData As IntPtr, ByVal
deviceInterfaceDetailDataSize As UInt32, ByRef requiredSize As UInt32, ByVal
deviceInfoData As IntPtr) As Boolean

--
Hope this helps
Jay B. Harlow [MVP - Outlook]
..NET Application Architect, Enthusiast, & Evangelist
T.S. Bradley - http://www.tsbradley.net

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