C# equivalent of VB DLL function declaration

Question

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What is the C# equivalent of this VB code?

VB

Declare Auto Function SendMessage Lib "user32.dll" (ByVal hWnd As IntPtr, ByVal msg As Integer, _
ByVal wParam As Integer, ByVal lParam As Integer) As Integer

Below code is converted to C#

C#

[DllImport("user32.dll")]
static extern int SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);

but my switch case still show error like this :

Error 1 : A switch expression or case label must be a bool, char, string, integral, enum, or corresponding nullable type"

this is my full code to detect inserted/removed USB..

C#

//Used to detected if any of the messages are any of these constants values.

        private const int WM_DEVICECHANGE = 0x219;

        private const int DBT_DEVICEARRIVAL = 0x8000;

        private const int DBT_DEVICEREMOVECOMPLETE = 0x8004;
        //
        private const int DBT_DEVTYP_VOLUME = 0x2;
        //
        //Get the information about the detected volume.
        private struct DEV_BROADCAST_VOLUME
        {


            int Dbcv_Size;

            int Dbcv_Devicetype;

            int Dbcv_Reserved;

            int Dbcv_Unitmask;

            short Dbcv_Flags;
        }


        [DllImport("user32.dll")]
        static extern int SendMessage(IntPtr hWnd, int msg, int wParam, int lParam); 

        protected override void WndProc(ref System.Windows.Forms.Message M)
        {
            //
            //These are the required subclassing codes for detecting device based removal and arrival.
            //

            if (M.Msg == WM_DEVICECHANGE)
            {
                switch (M.WParam) //  <---------------------------############## ERROR in HERE
                {
                    //
                    //Check if a device was added.
                    case DBT_DEVICEARRIVAL:

                        int DevType = Runtime.InteropServices.Marshal.ReadInt32(M.LParam, 4);


                        if (DevType == DBT_DEVTYP_VOLUME)
                        {
                            DEV_BROADCAST_VOLUME Vol = new DEV_BROADCAST_VOLUME();

                            Vol = Runtime.InteropServices.Marshal.PtrToStructure(M.LParam, typeof(DEV_BROADCAST_VOLUME));


                            if (Vol.Dbcv_Flags == 0)
                            {

                                for (int i = 0; i <= 20; i++)
                                {
                                    if (Math.Pow(2, i) == Vol.Dbcv_Unitmask)
                                    {
                                        string Usb = Chr(65 + i) + ":\\";
                                        // ini untuk mendeteksi flashdisk saat pertama kali dimasukan kedalam komputer dan membunuh autorun virus
                                        if (My.Computer.FileSystem.FileExists(Usb.ToString + "Autorun.inf"))
                                            Kill(Usb.ToString + "Autorun.inf");
                                        MsgBox("USB device was plugged in!" + vbNewLine + vbNewLine + "The drive letter is: " + Usb.ToString + vbNewLine + "If Autorun Virus Exist, it will Automatic Kill Autorun!", MsgBoxStyle.Information);
                                        //untuk menampilkan alamat flashdisk yang masuk kekomputer
                                        TextBox1.Text = Usb.ToString;
                                        break; // TODO: might not be correct. Was : Exit For
                                    }
                                }

                            }

                        }
                        break;
                    //
                    //Check if the message was for the removal of a device.
                    case DBT_DEVICEREMOVECOMPLETE:

                        int DevType = Runtime.InteropServices.Marshal.ReadInt32(M.LParam, 4);


                        if (DevType == DBT_DEVTYP_VOLUME)
                        {
                            DEV_BROADCAST_VOLUME Vol = new DEV_BROADCAST_VOLUME();

                            Vol = Runtime.InteropServices.Marshal.PtrToStructure(M.LParam, typeof(DEV_BROADCAST_VOLUME));


                            if (Vol.Dbcv_Flags == 0)
                            {

                                for (int i = 0; i <= 20; i++)
                                {

                                    if (Math.Pow(2, i) == Vol.Dbcv_Unitmask)
                                    {
                                        string Usb = Chr(65 + i) + ":\\";

                                        MsgBox("Looks like a volume device was removed!" + vbNewLine + vbNewLine + "The drive letter is: " + Usb.ToString, MsgBoxStyle.Information);

                                        break; // TODO: might not be correct. Was : Exit For

                                    }

                                }

                            }

                        }

                        break;
                }

            }

            base.WndProc(ref M);

        }

some one can help me to fix it?

Posted 23-May-13 23:22pm

Gun Gun Febrianza

Updated 23-May-13 23:24pm

v2

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Comments

Mahesh Bailwal 24-May-13 5:39am

Can you assign M.WParam into int variable and then use it in switch and try. Like below

int tempWparam = (int)M.WParam;
switch(tempWparam)
{
..
}

walterhevedeich 24-May-13 5:41am

Beat me to it. You should have posted this as a solution. :)

Mahesh Bailwal 24-May-13 5:52am

I was not sure :)

Gun Gun Febrianza 24-May-13 6:24am

found 25 Error........

Error 3 'Anti_Copy_Media_Version_2._0.Form1.DEV_BROADCAST_VOLUME.Dbcv_Flags' is inaccessible due to its protection level C:\Users\Kaizer\Desktop\Anti Copy Media Version 2.0\Anti Copy Media Version 2.0\Form1.cs 288 37 Anti Copy Media Version 2.0

walterhevedeich 24-May-13 6:53am

I think you have to declare your DEV_BROADCAST_VOLUME struct and its variables public if you want to access them.

Gun Gun Febrianza 24-May-13 7:08am

yep.. this fix some error sir.. :)

error in this code ,
int DevType = Runtime.InteropServices.Marshal.ReadInt32(M.LParam, 4);

i was convert it from VB.Net

Dim DevType As Integer = Runtime.InteropServices.Marshal.ReadInt32(M.LParam, 4)

error result
Error 1 The name 'Runtime' does not exist in the current context C:\Users\Kaizer\Desktop\Anti Copy Media Version 2.0\Anti Copy Media Version 2.0\Form1.cs 277 39 Anti Copy Media Version 2.0

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walterhevedeich · Accepted Answer · 2013-05-23T23:40:00

Solution 1

M.WParam[^] is an IntPtr. Try casting it to int.

Posted 23-May-13 23:40pm

walterhevedeich

Comments

Gun Gun Febrianza 24-May-13 6:30am

iam tried use this code to casting it into integer but still not working ..
below is my code .. hmm, any suggest sir?
switch((int)m.WParam))

walterhevedeich 24-May-13 6:34am

What's the error this time?

Gun Gun Febrianza 24-May-13 6:38am

boss. below code is the error :

Error 6 'Anti_Copy_Media_Version_2._0.Form1.DEV_BROADCAST_VOLUME.Dbcv_Flags' is inaccessible due to its protection level C:\Users\Kaizer\Desktop\Anti Copy Media Version 2.0\Anti Copy Media Version 2.0\Form1.cs 287 37 Anti Copy Media Version 2.0

god i am stuck :(

CPallini · Accepted Answer · 2013-05-23T23:42:00

Solution 2

The error occurs because WParam type is IntPtr (see MSDN[^]).
Since you are using int in your case statements then you may safely write your switch this way:

C#

switch( M.WParam.ToInt32())

[fixed a typo]

Posted 23-May-13 23:42pm

CPallini

Updated 24-May-13 0:58am

v3

Comments

Gun Gun Febrianza 24-May-13 6:30am

i am tried but still found error :)

Gun Gun Febrianza 24-May-13 6:32am

Error 1 'System.IntPtr' does not contain a definition for 'toInt32' and no extension method 'toInt32' accepting a first argument of type 'System.IntPtr' could be found (are you missing a using directive or an assembly reference?) C:\Users\Kaizer\Desktop\Anti Copy Media Version 2.0\Anti Copy Media Version 2.0\Form1.cs 271 34 Anti Copy Media Version 2.0

CPallini 24-May-13 6:59am

It is ToInt32() (there was a typo in my answer)