Imported DLL problem - C# Discussion Boards

michaelgr122-Apr-10 3:22

22-Apr-10 3:22

Hello,

I have window application in windows7. It updates datagrids from sql DB.
In windows XP it works fine .
In windows7- there are computers it works fine and there are computers the application itself loads but it can't connect to the sql server (and update the datagrids). I have .net framework installed on both computer.
What can be the problem?

Re: c# and sql windows 7 problem

dan!sh 22-Apr-10 4:42

dan!sh

22-Apr-10 4:42

Where is the SQL server you are trying to connect to? In same network or any other?

Re: c# and sql windows 7 problem

Not Active22-Apr-10 4:47

Not Active

22-Apr-10 4:47

If the app loads then I would say it isn't a problem with the app, Windows7 or the .net framework. I seems more likely that the issue is with the machine being able to connect to the database. Check for connectivity issues. If you're using integrated security and using the windows login account perhaps these people don't have the proper rights.

I know the language. I've read a book. - _Madmatt

Re: c# and sql windows 7 problem

Swiftain22-Apr-10 4:50

Swiftain

22-Apr-10 4:50

You should post your code or the error generated so we can know what we're dealing with

Re: c# and sql windows 7 problem

michaelgr122-Apr-10 5:52

michaelgr1

22-Apr-10 5:52

I am using server username and password (not windows).
The server is located on the same network that the computer.

The problem is that on some windows7 computer all works fine and on some other it cann't connect to DB. I am not using windows credentials to connect to the DB but the server credentials.

Re: c# and sql windows 7 problem

Not Active22-Apr-10 6:14

Not Active

22-Apr-10 6:14

You'll have to check the connectivity on the machine that don't work. Perhaps it a firewall issue that is preventing connecting to the database server

I know the language. I've read a book. - _Madmatt

Re: c# and sql windows 7 problem

Not Active22-Apr-10 6:13

Not Active

22-Apr-10 6:13

One, you responded to the wrong post
Two, the code is irrelevant

I know the language. I've read a book. - _Madmatt

Imported DLL problem

TimSWatson22-Apr-10 3:00

TimSWatson

22-Apr-10 3:00

Hi
Im having a problem getting the code below to work.

compressorHnd = Avi.ICOpen(Avi.FOURCC.ICTYPE_VIDEO, Avi.FOURCC.DIVX, Avi.ICMODE.ICMODE_COMPRESS);

pCV = new Avi.COMPVARS();
pCV.cbSize = Marshal.SizeOf(pCV);
pCV.hic = compressorHnd;
pCV.dwFlags = 1;
pCV.fccHandler = Avi.FOURCC.DIVX;
pCV.fccType = Avi.FOURCC.ICTYPE_VIDEO;

outbi = new Avi.BITMAPINFOHEADER();
outbi.biSize = Marshal.SizeOf(outbi); // 40
outbi.biWidth = 640;
outbi.biHeight = 480;
outbi.biPlanes = 1;
outbi.biBitCount = 24;
outbi.biCompression = 0;

Avi.ICSeqCompressFrameStart(pCV, ref outbi);

bool key = false; long size = 0;

IntPtr r = (IntPtr)Avi.ICSeqCompressFrame(pCV, 0, image.ToArray(), ref key, ref size);

The code causes an "System.AccessViolationException: Attempted to read or write protected memory" exception on the last line.

ICSeqCompressFrame is imported using the code,

[DllImport("MSVFW32.dll")]
     public static extern int ICSeqCompressFrame(
         COMPVARS pc,
         int uiFlags,
         byte[] lpBits,
         ref bool pfKey,
         ref long plSize
         );

Can anyone help me out?

Re: Imported DLL problem

Luc Pattyn22-Apr-10 3:38

Luc Pattyn

22-Apr-10 3:38

Hi,

AFAIK you can't pass arrays like that, you need to offer some help. Here[^] is a little article explaining some ways that do work.

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

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We all depend on the beast below.

Re: Imported DLL problem

David Knechtges22-Apr-10 3:44

David Knechtges

22-Apr-10 3:44

Looks to me like your pinvoke signature is wrong. Several of the items are declared as the items themselves, not as pointers like the actual function expects:

pc
lpBits
pfKey
plSize

Use this tool to help you generate the pinvoke signatures:

http://download.microsoft.com/download/f/2/7/f279e71e-efb0-4155-873d-5554a0608523/CLRInsideOut2008_01.exe[^]

And when you get them generated, please post them on www.pinvoke.net for others to use.

I used that same tool to help me generate pinvoke signatures for the wifi DLL in Windows.

Thumbnail control for sorting images by drag & drop

ab-tools22-Apr-10 2:32

ab-tools

22-Apr-10 2:32

Hello,

is there any thumbnail control that supports the sorting of thumbnail images by drag & drop?

The reason is that I need a thumbnail control that displays images (similar as e. g. Adobe reader displays the pages on the left side (screenshot), but the user should be able to sort these images by drag & drop.

Thanks in advance for any tips
Andreas

Re: Thumbnail control for sorting images by drag & drop

Eddy Vluggen22-Apr-10 5:36

Eddy Vluggen

22-Apr-10 5:36

ab-tools wrote:
is there any thumbnail control that supports the sorting of thumbnail images by drag & drop?

Yes and no. It's not a "thumbnail"-control, but the standard PictureBox does provide all the functionality you're after;

Set the size and width of the desired thumbnail-image
Set the SizeMode[^] to StretchImage
Support for Drag and Drop[^]

--edit;
Sounds logical to have multiple of those in a Panel Smile | :)

I are Troll Suspicious | :suss:

Re: Thumbnail control for sorting images by drag & drop

ab-tools22-Apr-10 5:44

ab-tools

22-Apr-10 5:44

Hello Eddy,

first thank you for your fast answer.

Yes, I already thought about doing that with PictureBoxes.

But it's not just the drag & drop of the PictureBoxes themselves, but also an additional label (e. g. for a file name or a page number) for each PictureBox and, of course, it also should look good: so the user can see which PictureBox is selected at the moment and also sees where he has to drop it for changing the sorting.

So I just hoped there exists already a control that does such things. Of course, I would also pay some money for it if I save the time implementing it by myself.

Best regards and thanks for any futher ideas on that topic
Andreas

Re: Thumbnail control for sorting images by drag & drop

Eddy Vluggen22-Apr-10 6:01

Eddy Vluggen

22-Apr-10 6:01

ab-tools wrote:
also an additional label (e. g. for a file name or a page number) for each PictureBox

Still thinking along the lines of the PictureBox, that would be done by overriding the Paint-handler, drawing the text onto the picture yourself.

ab-tools wrote:
it also should look good: so the user can see which PictureBox is selected

"Pretty" is an opinion, I can't help there Smile | :)

The selection would be done by drawing a square around the box, in the current "selection" color as defined by the users' configuration.

ab-tools wrote:
So I just hoped there exists already a control that does such things.

There's probably a lot that comes close, like the Tiles control from Infragistics[^].

I are Troll Suspicious | :suss:

Re: Thumbnail control for sorting images by drag & drop

ab-tools22-Apr-10 6:11

ab-tools

22-Apr-10 6:11

Hello Eddy,

thanks again.

Then I'll do it on my own - just thought there would be a control that I can use out of the box...

Best regards
Andreas

Read IP address of all website currently visted

makdu22-Apr-10 2:15

makdu

22-Apr-10 2:15

Hi,
I am trying to make an application which tries to read the website ip's currentely visited. I have found an example of packet sniffer in c# (http://www.codeproject.com/KB/IP/CSNetworkSniffer.aspx).
My problem is that i dont want to run the call conitnuously. So i kept the call in a timer. All works fine, but when i plugged in my wifi internet connection( in addtion to my current lan connection), i was not able to view webpage. So i modified the code such a way to montior the ip through all the port. Then i am getting

System.Net.Sockets.SocketException: An invalid argument was supplied
   at System.Net.Sockets.Socket.IOControl(Int32 ioControlCode, Byte[] optionInValue, Byte[] optionOutValue)
   at System.Net.Sockets.Socket.IOControl(IOControlCode ioControlCode, Byte[] optionInValue, Byte[] optionOutValue)

Here is my code

private void checkIP()
        {

            //mainSocket.Close();
            //   mainSocket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.IP);
            mainSocket = new Socket(AddressFamily.InterNetwork, SocketType.Raw, ProtocolType.IP);
            mainSocket.Bind(new IPEndPoint(IPAddress.Any,0));// Parse(strIP), 0));
            mainSocket.SetSocketOption(SocketOptionLevel.IP,          //Applies only to IP packets
                           SocketOptionName.HeaderIncluded, //Set the include the header
                           true);                           //option to true
            byte[] byTrue = new byte[4] { 1, 0, 0, 0 };
            byte[] byOut = new byte[4] { 1, 0, 0, 0 }; //Capture outgoing packets
          mainSocket.IOControl(IOControlCode.ReceiveAll,              //Equivalent to SIO_RCVALL constant//of Winsock 2
                   byTrue,
                   byOut);
                
            mainSocket.BeginReceive(byteData, 0, byteData.Length, SocketFlags.None, new AsyncCallback(OnReceive), null);
            timer1Sec.Enabled = true;
        }  
 private void OnReceive(IAsyncResult ar)
        {
            try
            {
                int nReceived = mainSocket.EndReceive(ar);

                //Analyze the bytes received...

                ParseData(byteData, nReceived);

            }

            catch (Exception ex)
            {
                //   MessageBox.Show(ex.Message, "MJsniffer", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

checkIP is called from a timer. I am getting exception in mainSocket.IOControl

Enum Member

DIPAK@EMSYS22-Apr-10 0:59

DIPAK@EMSYS

22-Apr-10 0:59

hi guys.
Any one has idea about how can we give enum member like A+,B+...

public enum Color
    {
     Any,
     D+, 
     D, 
     D-, 
     E+ 
    };

I tried creating above enum but bad luck its giving error saying } expected.

dipak

Re: Enum Member

OriginalGriff22-Apr-10 1:02

OriginalGriff

22-Apr-10 1:02

You can't.

Enum members follow the normal rules for names - same as methods, properties, fields and namespaces.

All you can do is use the word "Plus" or "Minus" instead.

You should never use standby on an elephant. It always crashes when you lift the ears. - Mark Wallace

C/C++ (I dont see a huge difference between them, and the 'benefits' of C++ are questionable, who needs inheritance when you have copy and paste) - fat_boy

Re: Enum Member

DIPAK@EMSYS22-Apr-10 1:10

DIPAK@EMSYS

22-Apr-10 1:10

Does it mean that ther is no way to make such member in enum?

dipak

Re: Enum Member

OriginalGriff22-Apr-10 1:27

OriginalGriff

22-Apr-10 1:27

Yes.

In C#, all identfiers (methods, properties, fields, and namespaces) must adhere to the following rules:

The name can contain letters, digits, and the underscore character (_).

The first character of the name must be a letter. The underscore is also a legal first character, but its use is not recommended at the beginning of a name. An underscore is often used with special commands, and it's sometimes hard to read.

Case matters (that is, upper- and lowercase letters). C# is case-sensitive; thus, the names count and Count refer to two different variables.

C# keywords can't be used as variable names. Recall that a keyword is a word that is part of the C# language.

The characters '+', '-', '(' ')', '=', ',', ';' and many others cannot be used in the name of any identifier.

So, no. You can't do it. At all. Ever.

Re: Enum Member

#realJSOP22-Apr-10 1:32

#realJSOP

22-Apr-10 1:32

You can only use underscores and alphnumeric characters in enum ordinal names. You also can't start the name with a digit.

.45 ACP - because shooting twice is just silly
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Re: Enum Member

Pete O'Hanlon22-Apr-10 2:01

Pete O'Hanlon

22-Apr-10 2:01

Add a Description attribute, and use reflection to extract the description from that e.g