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I'm trying to make a call into a compression dll
This is declared like this in VB6:
<br />
Private Declare Function compress Lib "compression.dll" (dest As Any, destLen As Any, src As Any, ByVal srcLen As Long) As Long<br />
Private Declare Function uncompress Lib "compression.dll" (dest As Any, destLen As Any, src As Any, ByVal srcLen As Long) As Long
I've added the following to a c# class
<br />
[DllImport("compression.dll")]<br />
public static extern int uncompress(ref byte[] inputBuffer, ref int inputLength, ref byte[] outputBuffer, int OutputLength);<br />
[DllImport("compression.dll")]<br />
public static extern int compress( [MarshalAs(UnmanagedType.LPStr)] StringBuilder inputBuffer,ref int inputLength, [MarshalAs(UnmanagedType.LPStr)] StringBuilder outputBuffer, int OutputLength);
If i call the compress method using c# and decompress using c# this works fine. The problem arises when i try to compress in c# and decompress in vb6 or vice versa. Is there a back compatability mode for string functions like this?
Thanks in advance
Russell
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Russell Jones wrote: The problem arises
What is the problem... an error message, invalid data, what? Please provide a little detail.
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what is sub-classing in C#, and hw to achive that.
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//a.k.a inheritance.
//so for example...
public class ClassOne : ClassBase
{
//this class is a subclass of ClassBase
}
public class ClassTwo : ClassBase
{
//this class is a subclass of ClassBase
}
public class ClassBase
{
protected int X = 5; // The two subclasses can access this variable as its been "inherited"
}
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i want to select the text written in the rich text box
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hi
myrichtextbox.SelectAll():
regards
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Hello treah,
with the RTFControl1.SelectionStart and RTFControl1.SelectionLength will give you the start and length (int) so you can get the text!
Hope that helps
Nassos
GanDad
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Hi all.
Im trying to load data into a combo box during form load.The items Im trying to load are from a database.
Now here is my little code that gives me errors.
protected void Page_Load(object sender, EventArgs e)
{
con.ConnectionString = str;
String str1 = "Select * from Filter";
con.Open();
cm.Connection = con;
dtr = cm.ExecuteReader();
if (dtr.Read())
{
// Load FilterByKeys onto the combo box
cboExtension.Text = (dtr["FilterKey"]).ToString();<<*****Problem****
lblMessage.Text = "Good. All the values are loaded";
Thanx.
kagiso
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What a mess
matjame wrote: con.ConnectionString = str;
what is str, and why is a member variable named so badly ?
matjame wrote: String str1 = "Select * from Filter";
You never use this anywhere, so it's irrelevant to the rest of the code.
What is con, cm and dtr ? Why do you have badly named member variables like this, that probably could be local, and are not named in a way that means anything ?
matjame wrote: cboExtension.Text = (dtr["FilterKey"]).ToString();<<*****Problem****
What's the problem ? Does it not compile ? Does it blow up ? What's the error message ?
This is also not going to do more than add one value into the combo box. That's what the Text property will do. To add items, make a collection the datasource, and if it's not a collection of strings, set the DisplayMember property.
All of this looks to me like you're making it up as you go and hoping it will work. Intellisense is no substitute for reading MSDN or buying a good book as a reference.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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DataTable status = new DataTable();
status = ExecuteNonQuery_SP("Select * from Filter");//getting the value
cmbStatus.DataSource =status ;
cmbStatus.DisplayMember = "Status_Name";
cmbStatus.ValueMember = "Status_Id";
give the displaymember and valuemember to the combobox'x object
here cmbStatus is the combobox
My small attempt...
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sujithkumarsl wrote: status = ExecuteNonQuery_SP("Select * from Filter");//getting the value
cmbStatus.DataSource =status ;
 
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status = ExecuteNonQuery_SP("Select * from Filter");//getting the value
cmbStatus.DataSource =status ;
actually ExecuteNonQuery_SP("Select * from Filter"); is a method which takes quaery as parameter and returns the datatable.
i used this code in my proj and its working
My small attempt...
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sujithkumarsl wrote: actually ExecuteNonQuery_SP("Select * from Filter"); is a method which takes quaery as parameter and returns the datatable.
i used this code in my proj and its working
Two things:
1) There is no method named ExecuteNonQuery_SP in the framework, and therefore using it in an example to a newer programmer is just going to confuse them more! This method is most likely defined in your own project, or is part of a data access framework that you use.
2) The name of the method would imply that it executes IDbConnection.ExecuteNonQuery which does not "return a table". If your method really does take a SQL clause as a parameter and return a table it should be named ExecuteDataTable_SP
Please take the time to consider the usefulness of the code and the target audience before posting a (useless) code snippet.
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Im using MS Access not SQL
kagiso
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 what a mess is this!!
"cbo.extension.text" will never populate items in to combobox control, this only displays the specified text
if it is already there in combobox items collection.
to populate the items u should specifie
{
combobox.items.add(dtr["filterKey"].tostring());
}
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cboExtension.items.add(dtr["filterKey"].tostring());
items gives this error
"System.Web.UI.WebControl.DropdownList doesnt contain definition for items."
Then to .tostring()
"object doesnt contain a definition for string
Can you generate a code that would work.
NB. The Items in the database are jus A.B.C til Z
So, it suppose to load A
B
C
Till Z
Thank you for your help.A nice code would be nice.Im an amature in this
kagiso
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please try the exable which i gave to you. that will work
which field from db, you want to add in combobox?
My small attempt...
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I want to filter by FilterKey
kagiso
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using sytem.oledb;
using system.windows.forms;
oledbconnection connect=new oledbconnection;
oledbcommand command=new oledbbcommand("Select 'field_name' from 'tabel' where 'condition'", connect);
oledbreader reader=command.executeReader();
reader.read();
{
combobox1.items.add(reader[0].tostring());
}
reader.close();
connect.close();
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using sytem.oledb;
using system.windows.forms;
oledbconnection connect=new oledbconnection;
oledbcommand command=new oledbbcommand("Select 'field_name' from 'tabel'
***There are only two fields. ID & FilterKey and Im using FilterKey
so no need for where *****
where 'condition'", connect);
oledbreader reader=command.executeReader();
reader.read();
{
combobox1.items.add(reader[0].tostring());
}
reader.close();
connect.close();
kagiso
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Ok, its not taking the using system.Windows.forms;
and the combobox1.items.add(reader[0].tostring()); says its doesnot have a definition for Add.
Everything else was what I did before
kagiso
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hi
if its a web application, it wont take windows.forms, and u wont get combobox control also....
in such case, use
" using system.web.ui.webcontrols; "
{
dropdownlist1.items.add(reader[0].tostring());
}
this will defenetely work
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This should do it.I will keep you posted, jus have to configure my database
kagiso
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Does anyone know why if i draw something using the Graphics class in a picturebox, and then shrink the screen, it disappears when i bring the form up again?
Mark.
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