IPropertyStorage.ReadMultiple problem - C# Discussion Boards

Hello!

I want to make a little program that check if a certain port is opened. For example when i run a server that opens the port 234 i want to see if that port is opened. If it is opened then the server is running.

I tryed with some System.net.socket but didn't work...
Thanks in advance Wink | ;)

One way to do it, and I'm not sure if this is the best/most-efficient way, is to try and register a .NET remoting channel on that port. It will throw an exception if the port is in use.

This will work for the local machine.

If you want to see if a port is opened on a remote machine, you'll need to attempt a socket connection to that address and port, or if you're using remoting, attempt connection to a remote object published on that address and port.

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Judah Himango

Lets say I have a old executable that was not created in the .NET world that contains a bunch of dll and stuff like that. This old executable takes in command line arguments to generate a specific result. I was thinking about creating a .NET assembly class to wrap this executable. The programmer using this wrapper would be able to specify certain properties and then generate a result.

My question is simple. When deploying this wrapper assembly do I........

1. Store the old executable and dlls into the assemblies Resources.resx and when the user wishes to generate a result make a directory and copy the files into the directory (if they do not already exist) and then generate the result.
2. Attach the old executable and dlls into a folder within the assembly project itself and change the build action to content and when the project is deployed make sure the content files are also deployed with the project.
3. Use another method?

Thanks Chris

chris175 wrote:
2. Attach the old executable and dlls into a folder within the assembly project itself and change the build action to content and when the project is deployed make sure the content files are also deployed with the project.

That is the option I'd go for. It keeps the app with its DLLs in a known place relative to your application.

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My website

Thanks for the input.

Hello!

I want to know how .NET managed threads in STA model application. When I create new thread should I init COM library in some way (like CoInitialize() in C++) or .NET did it for me?

Best regards,

M.

.NET does it all for you; you don't need to call CoInitialize. Note that if you're using a COM object on a background thread, ensure that the thread is STA. You can do this by calling thread.SetApartmentState before the thread has started executing.

Note that the UI thread for Windows Forms (and WPF, I believe) applications are STA by default, so if you created a COM object on that thread, you'll be fine.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Just F-ing Do It Smile | :)
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

I get the following error when calling the ReadMultiple method.
The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))

I don't suppose anyone has a working example of reading the summary information from a file? The annoying thing is that I can write to the summary fields but not read them Mad | :mad:

<br />
        [StructLayout(LayoutKind.Explicit, Size = 8, CharSet = CharSet.Unicode)]<br />
        public struct PropSpec<br />
        {<br />
            [FieldOffset(0)]<br />
            public int ulKind;<br />
            [FieldOffset(4)]<br />
            public IntPtr Name_Or_ID;<br />
        }<br />
<br />
        [StructLayout(LayoutKind.Explicit, Size = 16)]<br />
        public struct PropVariant<br />
        {<br />
            [FieldOffset(0)]<br />
            public short variantType;<br />
            [FieldOffset(8)]<br />
            public IntPtr pointerValue;<br />
            [FieldOffset(8)]<br />
            public byte byteValue;<br />
            [FieldOffset(8)]<br />
            public long longValue;<br />
<br />
            public void FromObject(object obj)<br />
            {<br />
                if (obj.GetType() == typeof(string))<br />
                {<br />
                    this.variantType = (short)VarEnum.VT_LPWSTR;<br />
                    this.pointerValue = Marshal.StringToHGlobalUni((string)obj);<br />
                }<br />
            }<br />
        }<br />
<br />
        [ComVisible(true), ComImport(),<br />
        Guid("00000138-0000-0000-C000-000000000046"),<br />
        InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]<br />
        public interface IPropertyStorage<br />
        {<br />
            uint ReadMultiple(<br />
                uint numProperties,<br />
                PropSpec[] propertySpecifications,<br />
                out PropVariant[] propertyValues);<br />
<br />
            uint WriteMultiple(<br />
                uint numProperties,<br />
                [MarshalAs(UnmanagedType.Struct)] ref PropSpec propertySpecification,<br />
                ref PropVariant propertyValues,<br />
                int propIDNameFirst);<br />
<br />
            uint Commit(<br />
                int commitFlags);<br />
        }<br />
<br />
// Specify the property to be retrieved <br />
PropSpec[] propSpecs = new PropSpec[1];<br />
propSpecs[0].ulKind = 1;<br />
propSpecs[0].Name_Or_ID = new IntPtr((int)summaryType);<br />
PropVariant[] propertyValues = new PropVariant[1];<br />
<br />
// Retrieve the value <br />
hresult = propStorage.ReadMultiple(1, propSpecs, out propertyValues); <br />

Thanks

Does this Q & A[^] help? A quick google search revealed it.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Just F-ing Do It Smile | :)
The apostle Paul, modernly speaking: Epistles of Paul

Judah Himango

Thanks for the link, but I've tried that one already with no luck.

I need to create pdf files from html files. I have searched it but i couldn't find a real solution.
I used Winnovative but it uses ads. The library must also transfrom html tables.
Are there open source libraries for converting files ?

have a look at this article http://www.codeproject.com/useritems/Easy_PDF_Programming.asp

it may help

Two sweet ones:

http://itextsharp.sourceforge.net/[^]
http://reports.sourceforge.net/[^]

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

I have used Itextsharp. It doesnt work good when table doesnt fit the page. It can not divide correctly. Also it makes whole widths the same.

Hello everyone,

I have a problem with one application which should run permanently to transfer some output from a serial port to a database. This application crashes about every 17 hours once which should not happen because of loosing data when the application is not running.

I located the error in this code:

if (tmp.Length > 0) {<br />
                        while (_conn.State != ConnectionState.Open) {<br />
                            _conn.Open();<br />
                            Thread.Sleep(100);<br />
                        }<br />
                        cmd.Connection = _conn;<br />
                        cmd.ExecuteNonQuery();<br />
                    }

* tmp is a string which contains the edited output of the serial port.
* _conn is an MySQL-Connection made through the MySQL-.NET-Connector 5.0
* cmd is a simple INSERT-Command (MySQLCommand)

So in this context i got the following error:

<br />
exception.source == mscorlib<br />
<br />
exception.message == Non-negative number required.\nParameter name: count<br />

My problem is: I cant see any parameter named count where the exception can happen. Might it be that the MySQL-Connector itself causes that exception? If this is the reason i'll try to rewrite the code for an ODBC-Connection.

I hope i provided all needed information to pass a hint to me.

With best regards,
K. Ahlers

You haven't posted the query that you are executing towards the DB
anyway try to set on nocount in the query string

Just
Set NOCOUNT ON
and at the end
SET NOCOUNT OFF

maybe it will help
I am not sure
by the way you can use a
DB profiler to check whether your problem emerges from the DB layer

My query is as I said a simple insert:

string now = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");<br />
MySqlCommand cmd = new MySqlCommand("INSERT INTO log (datelogged, logentry) VALUES ('" + now + "', '" + tmp + "')");

tmp is here equal to the tmp in my first posting a string from the serial output.

The table is a InnoDB table with the fields id(INT), datelogged(DATETIME), logentry(VARCHAR(200)

With best regards,
K. Ahlers

Hi,

"parameter named count" refers to a method that has count in it's documentation
(actually its reflected parm list); it does not refer to one of your app's
variables named count. Yhere are many candidates including:

public int SerialPort.Read (
byte[] buffer,
int offset,
int count
)

some suggestions:

- look at the entire exception, that is use exception.ToString(), it will
show all available information including line numbers, message details, and
inner exceptions if any
- have Visual show line numbers (see my sig)
- put a try-catch and have it show all relevant variables when it catches this
or some other exception, including cmd, tmp, ...

and ideas:

- a 16-bit number counting seconds would overflow after 18.2 hours
- you might have a memory leak (or a disk full; logging?) resulting in a
systematic failure; if exceptions are not handled correctly, that might
result in just about any symptom

final comment:
if all the above dont help, show us all available info and some complete methods.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google

Okay. I added the .ToString() but we have to wait for the next crash to execute...

With best regards,
K. Ahlers

[quote]make Visual display line numbers: Tools/Options/TextEditor/..[/quote]

Thanks for that... i gave up looking last time I tried.

ps. Another quality response. Out of interest, where are you from Luc?

---

How to get answers to your questions[^]

Hi,

J4amieC wrote:
make Visual display line numbers: Tools/Options/TextEditor/...

it is a shame Microsoft did not turn that on by default; posters ignore line numnbers
in exceptions since they don't show in source files anyway, making them look for
problems everywhere except where they really are.

J4amieC wrote:
where are you from

Belgium, a little south of where you are Laugh | :laugh:

See profile page.

Luc Pattyn [Forum Guidelines] [My Articles]

this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google

Okay NOW i have a complete error-message:

System.ArgumentOutOfRangeException: Non-negative number required.<br />
Parameter name: count<br />
   at System.IO.BufferedStream.Read(Byte[] array, Int32 offset, Int32 count)<br />
   at MySql.Data.MySqlClient.MySqlStream.Read(Byte[] buffer, Int32 offset, Int32 count)<br />
   at MySql.Data.MySqlClient.MySqlStream.ReadString(Int64 length)<br />
   at MySql.Data.MySqlClient.NativeDriver.GetFieldMetaData41()<br />
   at MySql.Data.MySqlClient.NativeDriver.GetFieldMetaData()<br />
   at MySql.Data.MySqlClient.NativeDriver.ReadColumnMetadata(Int32 count)<br />
   at MySql.Data.MySqlClient.MySqlDataReader.NextResult()<br />
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)<br />
   at MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery()<br />
   at Cisco2Mysql.Form1.serialPort1_DataReceived(Object sender, SerialDataReceivedEventArgs e)<br />

So it seems to be really a buggy .NET-Connector or can anyone there a mistake by me?

With best regards,
K. Ahlers

OK, seems the problem is in your serialPort1_DataReceived method.
Will you find it yourself, or do you plan on showing us the entire method's source code ?

For some reason, we did not get line numbers. Is this release code ?

And this seemed like an 9-hour run, not a 17-hour one ?

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google

Good morning Luc,

here is the complete method:

        private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e) {<br />
            try {<br />
                // Read out existing chars into _buffer<br />
                _buffer += serialPort1.ReadExisting();<br />
<br />
                // If there is a complete line availiable process it<br />
                int posofbreak = _buffer.IndexOf('\n');<br />
                if (posofbreak > -1) {<br />
                    // Get the line<br />
                    string tmp = _buffer.Substring(0, posofbreak).Trim();<br />
<br />
                    // If there is more code than this line put it back into the buffer<br />
                    if (posofbreak < _buffer.Length - 1)<br />
                        _buffer = _buffer.Substring(posofbreak + 1);<br />
<br />
                    // If there is a command-prompt before the log-text remove it<br />
                    while (tmp.IndexOf('>') > -1)<br />
                        tmp = tmp.Substring(tmp.IndexOf('>') + 1).Trim();<br />
<br />
                    // Get a database-readable date<br />
                    string now = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");<br />
<br />
                    // Create insert-command for the database<br />
                    MySqlCommand cmd = new MySqlCommand("INSERT INTO cisco_log (datelogged, logentry) VALUES ('" + now + "', '" + tmp + "')");<br />
<br />
                    // If the textbox with every logoutput is too long shorten it<br />
                    if(box.Text.Length > 5000) <br />
                        box.Text = box.Text.Substring(0, 5000);<br />
<br />
                    // Add the new line before the old logtext<br />
                    box.Text = tmp + "\r\n" + box.Text;<br />
<br />
                    // If there is a call with both lines connected free one line for that call<br />
                    if (tmp.Contains("L11  0")) {<br />
                        serialPort1.WriteLine("CD EWE");<br />
                        serialPort1.WriteLine("DISCO 2");<br />
                        LogWrite("Call detected, disconnecting second line.");<br />
                    }<br />
<br />
                    // If there is a line error reconnect the line<br />
                    if (tmp.Contains("L67  2")) {<br />
                        Thread.Sleep(2000);<br />
                        serialPort1.WriteLine("CD EWE");<br />
                        serialPort1.WriteLine("CALL 2");<br />
                        LogWrite("Line Integrity Violation detected, reconnecting second line.");<br />
                    }<br />
<br />
                    // Check whether the second line is connected, if not connect it and execute the insert-command<br />
                    if (tmp.Length > 0) {<br />
                        while (_conn.State != ConnectionState.Open) {<br />
                            _conn.Open();<br />
                            Thread.Sleep(100);<br />
                        }<br />
                        cmd.Connection = _conn;<br />
                        // MARKER<br />
                        cmd.ExecuteNonQuery();<br />
                    }<br />
<br />
                }<br />
<br />
                // Write the content of _buffer to a textbox for debug view<br />
                buff.Text = _buffer;<br />
            }<br />
            catch (Exception ex) {<br />
                LogWrite("Exception at serialPort1_DataReceived: "+ex.ToString());<br />
            }<br />
        }

After the "MARKER" the exception is thrown. (Yes it is a release-binary)

With best regards,
K. Ahlers

Hi,

I looked at your code and have some comments:

1.
you did not follow my advice "put a try-catch and have it show all relevant variables
when it catches this or some other exception, including cmd, tmp, ..."

2.
I don't see why you have the test in
if(posofbreak < _buffer.Length - 1) _buffer = _buffer.Substring(posofbreak + 1);

With it, if _buffer contains just one line ending on \n, that line remains in
_buffer and will be processed again next time DataReceived fires.

3.
while(tmp.IndexOf('>') > -1) tmp = tmp.Substring(tmp.IndexOf('>') + 1).Trim();
could have been handled more elegantly with ListIndexOf

4.
I am not sure the Thread.Sleeps, especially the one with 2000, are a good idea
inside DataReceived; they make your code not react for 2 seconds on the next
data; if for some reason "L67 2\n" comes in every second, you will never
catch up.

5.
I don't know what value serialport1.ReceivedBytesThreshold has; if it is
much larger than 1, chances are you receive more than one line of text every
time, but you only process one line at a time.
Actually, there should have been a while loop: as long as entire lines are
available, process it.

6.
if buffer contains only one line of the form
sometext > \n
then tmp will be an empty string; not sure SQL will like that

I strongly suggest you follow my advice (see 1); I don't understand how you
did not do this from the beginning: when something goes wrong, the more information
you have about it, the easier it is to pinpoint the problem...

Hope this helps.

Luc Pattyn [Forum Guidelines] [My Articles]

this weeks tips:
- make Visual display line numbers: Tools/Options/TextEditor/...
- show exceptions with ToString() to see all information
- before you ask a question here, search CodeProject, then Google