Re: How to use a COM Interface Dll within C# code??? - C# Discussion Boards

Re: Is the a max row count for SQLDataReader?

Ben Cocker5-Mar-09 6:54

5-Mar-09 6:54

Hi Jon,

Thanks for your reply, and the suggestions. Could I point you to my reply to Luc for a discussion of this out-of-memory limitation? And, I have been very careful to limit the number of fields I use and don't have any string columns, so although I take your point that 8 million rows is a beast, in SQL management studio the size of comma delimited output file is less than 1.5gig - I've got a 32 bit machine with maximum memory so I am skating on thin ice, but still I expected it to work out memory wise.

I'll look into LAPACK - thanks for the suggestion.

Ben

Re: Is the a max row count for SQLDataReader?

Dave Kreskowiak5-Mar-09 7:40

Dave Kreskowiak

5-Mar-09 7:40

Ben Cocker wrote:
SQL management studio the size of comma delimited output file is less than 1.5gig

So what? That's a file on disk that doesn't have the overhead of a storage class managing the data. THere is no limit on the Reader, since it only reads a single record at a time and returns the fields in that record. The real question is where is this data going?? Is it going into an ever-expanding collection?? If so, then you're running the machine out of memory.

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Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Re: Is the a max row count for SQLDataReader?

Dragonfly_Lee5-Mar-09 18:12

Dragonfly_Lee

5-Mar-09 18:12

Well, maybe you are confused about the datareader and dataset in ADO.net. DataReader object just go forward for ONE record each time. Generally, it will not take you too much memory for only one record, right?

I Love KongFu~

Re: Is the a max row count for SQLDataReader?

Pete O'Hanlon5-Mar-09 10:57

Pete O'Hanlon

5-Mar-09 10:57

Ben - what could you possibly do with this many records? You certainly couldn't present this to a user - are you meant to be passing this to some other process (say to store to a file).

I suspect you've got two problems - one, the record at position 726,301 is invalid in some way which you aren't catching in your code and two, the number of records is too great. BTW - it's never a good idea to just consume exceptions. You should actually do something with it, even if it's only log the exception. I normally use a variation of this function to parse the items (I'm typing this from memory so it may need a bit of tidying up):

public static T ParseValue(this SqlDataReader reader, string fieldName)
{
  int ordinal = reader.GetOrdinal(fieldName);
  if (reader.IsDBNull(ordinal))
    return default(T);
  return (T)reader.GetValue(ordinal);
}

Then you use this as

NewRecord.PAR1 = Reader.ParseValue("PAR1");

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How to use a COM Interface Dll within C# code???

lane0p25-Mar-09 6:18

lane0p2

5-Mar-09 6:18

Hi All,
i'm try to take the VB script and Dll in this article http://support.microsoft.com/kb/935635
and make the functionality work with C#.
i can add the ExIpSec.dll type library and with the using statement (using EXIPSECLib) i can expose the Interfaces and i can some of them to work. but when i try to retrieve the list if IP addresses i just get System.object[]. i have tried converting this to a string[] but i get nothing back.

can anyone tell how to correct call this dll? - DllImport does seem to work either!!

Many Thanks,

Phil

Re: How to use a COM Interface Dll within C# code???

Yusuf5-Mar-09 7:56

Yusuf

5-Mar-09 7:56

You may want to start at the beginning to understand how COM Interop [^]works

Yusuf

Re: How to use a COM Interface Dll within C# code???

Dragonfly_Lee5-Mar-09 18:20

Dragonfly_Lee

5-Mar-09 18:20

Well, without more info, we can not do anything with it. But all you did so far seems correct.

In fact, .Net will wrap up the COM for you(if you add COM dll from the Visual Studio), we do not need to worry about the interface. I am intended to say maybe you miss something in your code, such as initialize certain parameter.

I Love KongFu~

Re: How to use a COM Interface Dll within C# code???

lane0p25-Mar-09 23:29

lane0p2

5-Mar-09 23:29

the lines in the VB script are:
Set objDsIpSec = CreateObject("ExIpSec.ExIpSecurity")
objDsIpSec.BindToSmtpVsi "someSMTPserver", 1, "someDC"
objDsIpSec.GetRelayIpList
listToDisplayIp = objDsIpSec.IpGrant
listToDisplayIp appears to be a string array.

the lines in using in C# are:
ExIpSecurity ipsec = new ExIpSecurity();
string[] s;
ipsec.BindToSmtpVsi("someSMTPserver", 1, "someDC");
ipsec.GetRelayIpList();
s = ipsec.IPGrant.ToString().Split(' ');

foreach (string i in s)
{
MessageBox.Show(i.ToString());
}

if i run the VB script i get a list of IP address but if i run the C# code i get one popup box saying System.Object[]

what am i doing wrong?

Re: How to use a COM Interface Dll within C# code???

Dragonfly_Lee6-Mar-09 2:41

Dragonfly_Lee

6-Mar-09 2:41

lane0p2 wrote:
ipsec.BindToSmtpVsi("someSMTPserver", 1, "someDC");
ipsec.GetRelayIpList();
s = ipsec.IPGrant.ToString().Split(' ');

Did you debug the code and check what the value of IPGrant is?

I Love KongFu~

Re: How to use a COM Interface Dll within C# code???

lane0p26-Mar-09 4:45

lane0p2

6-Mar-09 4:45

hello,

done it!
when debugging i could see all the entries in IPGrant, the problem was converting the object array into a string array, i managed this with:
ExIpSecurity ipsec = new ExIpSecurity();
ipsec.BindToSmtpVsi(someSMTPserver, 1, "someDC");
ipsec.GetRelayIpList();

object[] o = (object[])ipsec.IPGrant;
string[] s = new string[o.Length];
Array arr = s;
o.CopyTo(arr, 0);
s = (string[])arr;

foreach (string i in s)
{
sw.WriteLine(i);
}

thanks for your help mate,
have a good weekend.

Phil

How to get the value from a variable and use it eg Form.VariableValue

MarkB1235-Mar-09 5:53

MarkB123

5-Mar-09 5:53

Hi all, can someone help with the following issue I'm having.

I am returning a dataset with a list of names of screen objects for a form.
I am trying to loop round the dataset, pick up the name then get the type of the control.

As follows...

foreach (DataRow row in dataSet_Groups.sp091_load_user_screen_components_layout.Rows)
{
strObjectName = Convert.ToString(row["ScreenObjectName"]);
strXMLText = Convert.ToString(row["XMLText"]);
intX = Convert.ToInt32(row["X"]);
intY = Convert.ToInt32(row["Y"]);
intWidth = Convert.ToInt32(row["Width"]);
intHeight = Convert.ToInt32(row["Weight"]);
intPosition = Convert.ToInt32(row["Position"]);

ctrlOnForm = frmToProcess.strObjectName;
switch (ctrlOnForm.GetType().FullName)
{
case "textEdit":
break;
}

}

frmToProcess is the form in question. How do I get the the value out of strObjectName and link it onto the the form name so I can check it's properties (see bold part in code). It's almost as if I need to perform Macro substitution (from my old FoxPro days)!
Sorry if my description is confusing.

Thanks.

Re: How to get the value from a variable and use it eg Form.VariableValue

Xmen Real 5-Mar-09 5:57

Xmen Real

5-Mar-09 5:57

this.Controls.Find(strObjectName, true);

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Rs0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y<pjxsg-b$f4ia>
--------------------------------------------------------
128 bit encrypted signature, crack if you can

Re: How to get the value from a variable and use it eg Form.VariableValue

MarkB1235-Mar-09 8:06

MarkB123

5-Mar-09 8:06

Perfect - many thanks.

How to link the current website to your textbox ?

YiXiang_895-Mar-09 5:52

YiXiang_89

5-Mar-09 5:52

Hi all, I need help
I have a IE toolbar menu button: Generate

My flow is
After i click the Generate button, the link on my current website will appear in a:
Form1 > textBoxWebPageURL

Form the Form1.Designer.cs

this.textBoxWebPageURL.Location = new System.Drawing.Point(238, 13);
this.textBoxWebPageURL.Name = "textBoxWebPageURL";
this.textBoxWebPageURL.Size = new System.Drawing.Size(328, 20);
this.textBoxWebPageURL.TabIndex = 5;
this.textBoxWebPageURL.Text = "http://www.codeproject.com"; <-- Whereby i have to hardcode it

How do i make it auto capture the current website that i am browsing and the textbox will display the current website ?

Thank You

OledbException when trying to Insert values in two combobox

haroon19805-Mar-09 5:44

haroon1980

5-Mar-09 5:44

Hi, Here is below code as i am trying to populate two combobox for different values but getting OledbException while running:

I have two tables called
Packing and Products
Packing=id,name
Products:id,prodname,price,packing [defined by number]

I have setup relation between them in MSAccess which is done..

Product.Packing=Number
Packing.PackingName=Text

Code:

private void Form1_Load(object sender, EventArgs e)
        {
            
            string sql ="SELECT distinct ProductName FROM Products";
            string sql2 = "SELECT  pac.PackingName FROM Products prod,Packing pac where prod.Packing=pac.PackingName ";
                        
                        DataSet ds=new DataSet();
            
                        try 
                        {
                                database = new OleDbConnection(connectionString);
                database.Open();
                        }
                        catch (Exception x)
                        {
                                MessageBox.Show(x.Message);
                        }
                        
                        OleDbDataAdapter adp=new OleDbDataAdapter(sql,database);
            adp = new OleDbDataAdapter(sql2,database);
            
                        adp.Fill(ds,"ProductName");
            adp.Fill(ds,"PackingName");
                                                        
                        foreach (DataRow dr in ds.Tables[0].Rows) 
                        {
                                comboBox3.Items.Add(dr[0].ToString()) ;
                comboBox1.Items.Add(dr[1].ToString());
                                        
                        }
            
 
            }

Any help please...Thanks,

Re: OledbException when trying to Insert values in two combobox

Yusuf5-Mar-09 8:07

Yusuf

5-Mar-09 8:07

shah123 wrote:
OleDbDataAdapter adp=new OleDbDataAdapter(sql,database); adp = new OleDbDataAdapter(sql2,database);

you are using the same data adapter for box queries. Is this what you want to do?

You need to process the first data adapter before reusing it or use different data adapter, even better, refactor your code and call it as many times as you want, for example

FillComboBox(comboBox, sql)
    {
      DataSet ds = new DataSet(); 
      try 
      { 
        database = new OleDbConnection(connectionString); 
        database.Open();

        OleDbDataAdapter adp = new OleDbDataAdapter(sql, database); 
        adp.Fill(ds, "tableName");         
        
        foreach (DataRow dr in ds.Tables[0].Rows) 
        { 
          comboBox.Items.Add(dr[0].ToString()); 
        }
      }
      catch (Exception x) 
      { 
        MessageBox.Show(x.Message); 
      }
    }

Yusuf

Re: OledbException when trying to Insert values in two combobox

haroon19805-Mar-09 12:24

haroon1980

5-Mar-09 12:24

Thanks Yusuf, But i have one different issue then just oledb exception...

I have two tables

Products=ProdId,ProdName,Price,Packing(Number as datatype)
Packing=packingId,PackingName (Text as datatype)

Now below code is in C# ..first check pls if "sql2" is correct query and then

when i execute an application i get an error "Expression Mismatch" on line:
adp.Fill(ds,"PackingName");

Thanks,
regards,

Re: OledbException when trying to Insert values in two combobox

haroon19805-Mar-09 23:52

haroon1980

5-Mar-09 23:52

I got the solution of how to tackle and did it by doing SQL query again to be bit corrected..and now no exception...

private void Form1_Load(object sender, EventArgs e)
        {
            
            string sql ="SELECT distinct ProductName FROM Products";
            string sql2 = "SELECT DISTINCT Packing.PackingName FROM Packing INNER JOIN Products ON Packing.PackingID=Products.Packing";
            

			DataSet ds=new DataSet();
            
            
			try 
			{
				database = new OleDbConnection(connectionString);
                database.Open();
			}
			catch (Exception x)
			{
				MessageBox.Show(x.Message);
			}
			
            OleDbDataAdapter adp = new OleDbDataAdapter(sql, database);
            adp.Fill(ds, "ProductName");

            adp = new OleDbDataAdapter(sql2, database);
            adp.Fill(ds,"PackingName");
							
			foreach (DataRow dr in ds.Tables[0].Rows) 
			{
				comboBox3.Items.Add(dr[0].ToString()) ;
                                comboBox1.Items.Add(dr[1].ToString());
             		
			}

But now in combobox1 i get the same values as in combobox3? Confused | :confused:

I think so pb in foreach loop?

Any advise please...

Lotus Notes (ConvertMIME)

tomas cook5-Mar-09 4:46

tomas cook

5-Mar-09 4:46

Hi,

I have a problem with connecting Lotus Notes via OLE. The connector itself is working and I can generate an E-Mail. But I cannot access the property ConvertMIME.

I have played around a little bit and found out:

Type NotesSessionType = Type.GetTypeFromProgID("Notes.NotesSession");
object NotesSession = Activator.CreateInstance(NotesSessionType);

bool obj = (bool)NotesSessionType.InvokeMember("ConvertMIME", BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.NonPublic |
BindingFlags.Instance | BindingFlags.GetProperty, null, NotesSession, null);

Works fine. But:

NotesSessionType.InvokeMember("ConvertMIME", BindingFlags.DeclaredOnly | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.SetProperty, null, NotesSession, new object[] {false});

Crashes with „TargetInvocationException“. HRESULT: 0x8000FFFF (E_UNEXPECTED). What I’m doing wrong?

Re: Lotus Notes (ConvertMIME)

tomas cook11-Mar-09 0:47

tomas cook

11-Mar-09 0:47

Hi folks,
it seems to be a serious problem. I would like to thank all peoples who read the thread and thinking about it. I have solved this issue with a VB.DLL I wrote and call in C#. If you have another suggestion please post.

Regards
gremgiz

How to insert into Master/Details at the same time ?

hdv2125-Mar-09 4:26

hdv212

5-Mar-09 4:26

Hi i'm looking for some tips and tricks about how to insert into relational data (Master/Detail) at the same time.
for example, user want to create new Customer, open Customer form to set it's values and insert some Orders for that Customer (which did not inserted into database yet) in Orders section, then save all together at the same time to database.
can anybody help me and has experience for this issue ?
thanks

Re: How to insert into Master/Details at the same time ?

Eddy Vluggen5-Mar-09 4:45

Eddy Vluggen

5-Mar-09 4:45

A transaction could be used to wrap both insert statements into an atomic operation that would "behave" like a single statement.

I are troll Smile | :)

Re: How to insert into Master/Details at the same time ?

hdv2125-Mar-09 4:50

hdv212

5-Mar-09 4:50

Thanks Eddy
I know this which run these operations under a single transaction, but my problem is that how to insert foreign key (from Customers) in to order record (because new customer has not been inserted yet, hence it does not a valid Primary key). i'm looking for some tips and tricks about this operation.

Re: How to insert into Master/Details at the same time ?

Eddy Vluggen5-Mar-09 5:11

Eddy Vluggen

5-Mar-09 5:11

I think I don't understand exactly what you want/need. Would this help, or am I missing something in your question?

BEGIN TRANSACTION
INSERT INTO Customers (CustName) VALUES ('John') -- Id field is identity, and therefore not named in the fieldlist.
DECLARE @custId AS BIGINT
SELECT @custId = @@IDENTITY -- put new custId key into "@custId" var
INSERT INTO ORDER (OrderId, CustomerId) VALUES (1, @custId)
COMMIT TRANSACTION

I are troll Smile | :)

Re: How to insert into Master/Details at the same time ?

hdv2125-Mar-09 5:59

hdv212

5-Mar-09 5:59

Thanks Eddy
I want almost this, but it's good for a one Order. how to do that for multiple Order at the same time ?

Note(Guide) : i want to iterate in Orders dataTable and insert each order into database.

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