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It will be very greatful if u suggest me one for my query. As of now I have got for connection sending and receiving data. but now I want the path of network while sending data.
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Hi,
I have on vb application
where i could not able to connect at one client place
With wintrapper
.RemoteHost = Split(strIpaddress, "|")(0)
.RemotePort = Split(strIpaddress, "|")(1)
.Connect
and on wintrapper.SendData i am getting error
Wrong protocol or connection state for the requested transaction or request
What should i do to connect to server?
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Have you read this article[^]? It talks about how to make a client and server communicate via sockets.
If you need help with a specific problem, be more specific.
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Hi All,
I have been making a user control. (VS 2003)
I wish to handle its mouse events.. something like, the control background should turn red on MouseDown, and become white again on MouseUp.
I added the MouseDown and MouseUp event handlers and tried changing its BackColor on MouseDown and MouseUp events. After building and adding this control to another application, i found that the color does not change.
Do i have to create my own events for this. I am not able to understand why this is not working.
Can anyone help me out with this. I am new to C#.
Thanks in advance.
*** Who said nothing is impossible? I have been doing it for a long time ***
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Did you call this.Invalidate(); after you changed the BackColor of your control?
Dave Kreskowiak
Microsoft MVP - Visual Basic
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Hello
1- Make a break point in your code to see if the events are really excuted or not. You could also do something else like showing a MessageBox, or sending a trace, or anything as an evidence of the excution of the handlers.
2- Please post the code that you change the background with. This also might help.
Regards ![Rose | [Rose]](https://www.codeproject.com/script/Forums/Images/rose.gif)
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I am trying to use a C++ dll designed in VS 6.0 with C# .net. The problem is with passing a pointer into the dll that expects a char* (not unicode). I have tried passing a IntPtr, a StringBuilder, and a Byte[], but I get the same results "AccessViolationException was unhandled" "Atempted to read or write protected memory. Any help would be appreciated.
Heres the C++ dll code:
extern "C" __declspec(dllexport) BOOL ExGetDeviceSerialNumber(DWORD nDevice, char *pSerialNum)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState());
TRACE(_T("Entering LogiComm2GD ExGetDeviceSerialNumber\n"));
return DllGetApp()->GetDeviceSerialNumber(nDevice, pSerialNum);
}
BOOL CLogiComm2GDApp::GetDeviceSerialNumber(DWORD nDevice, char *pSerialNum)
{
if(nDevice >= m_NumL2GDDevices)
return FALSE;
strcpy(pSerialNum, &m_USBSerialNumbers[nDevice][0]); // exception here
return TRUE;
}
and here's the C# code:
// dllImport declaration
// get the device serial numbers
[DllImport(@"C:\Documents and Settings\jbroderick\My Documents\Visual Studio 2005\Projects\\USB_D2XX_App\LogiComm2GD.dll",
EntryPoint = "ExGetDeviceSerialNumber",
ExactSpelling = false,
CharSet = CharSet.Ansi,
CallingConvention = CallingConvention.Cdecl)]
public static extern unsafe bool ExGetDeviceSerialNumber(long nDevice, IntPtr ptr);
// access the dll
IntPtr ptrSN = IntPtr.Zero;
ExGetDeviceSerialNumber(Device, ptrSN); // exception here
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JohnnyB717 wrote: strcpy(pSerialNum, &m_USBSerialNumbers[nDevice][0]); // exception here
I would think so since pSerialNum has never been allocated.
"strcpy" is deprecated... see the safe string function reference[^]
Also the design seems flawed. Basically the whole thing is a mess, whoever wrote that C++ should not be writing production code.
led mike
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Thanks Led mike for your reply.
I have also tried using a byte[] with the same result as below. Any suggestions would be appreciated.
// get the device serial numbers
[DllImport(@"C:\Documents and Settings\jbroderick\My Documents\Visual Studio 2005\Projects\\USB_D2XX_App\LogiComm2GD.dll",
EntryPoint = "ExGetDeviceSerialNumber",
ExactSpelling = false,
CharSet = CharSet.Ansi,
CallingConvention = CallingConvention.Cdecl)]
public static extern bool ExGetDeviceSerialNumber(long nDevice,
[MarshalAs(UnmanagedType.LPArray)] ref byte[] SerialNumber);
byte[] serByte = new byte[500];
ExGetDeviceSerialNumber(Device, ref serByte);
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Hello
I'm not sure if this is the problem, but if I were you I'd give these points attention in this particular order:
1- Your nDevice parameter is a DWORD which is 32bits long, while in your C# code you pass a long which is 64bits long. You should try passing an int32 instead.
2- The second parameter is char* while you pass it IntPtr.. I suggest you pass a StringBuilder class instead. If you do you'd have to remove the unsafe keyword.
3- You are making your C# declaration a bit complex. Why?? Try this P/Invoke:
[DllImport(@"C:\Documents and Settings\jbroderick\My Documents\Visual Studio 2005\Projects\\USB_D2XX_App\LogiComm2GD.dll",
ExactSpelling = true,
CharSet = CharSet.Auto,
CallingConvention = CallingConvention.Cdecl)]
public static extern bool ExGetDeviceSerialNumber(long nDevice, IntPtr ptr);
Notice that IMO the unsafe keyword is not necessary.
4- Calling another function from the exported function? I have doubts about this part.Try copy/paste the code in the second function into the first.
5- Comment these line for the sake of debugging, if they are not necessary:
AFX_MANAGE_STATE(AfxGetStaticModuleState());
TRACE(_T("Entering LogiComm2GD ExGetDeviceSerialNumber\n"));
Also elaborate what does this macro do.
I hope this helps.
Regards
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Thanks Nader,
I changed the declaration to:
// get the device serial numbers
[DllImport(@"C:\Documents and Settings\jbroderick\My Documents\Visual Studio 2005\Projects\USB_D2XX_App\LogiComm2GD.dll",
EntryPoint = "ExGetDeviceSerialNumber",
ExactSpelling = false,
CharSet = CharSet.Ansi,
CallingConvention = CallingConvention.Cdecl)]
public static extern bool ExGetDeviceSerialNumber(Int32 nDevice, StringBuilder sn);
Apparently passing in the Int32 instead of long fixed the problem. I was so focused on the char* conversion that I didn't pay attention to the long. Also, I was able to pass in the long as a ref and get back the number of devices without issue. So, I thought that was OK.
Thanks again!
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Hi all,
I would like to add a control like a button to a form of another program.
i allready have the handle to that form.
how can i create a button and know when it is pushed and how do i add it to the other form.
can it be done with sendmessage?
Thanks,
Ran.
R.Z
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You can create a window and set it's parent window, I'm not sure if it will work for another process, but it's worth a try.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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I need to find out if the anti-virus software is running on my local machine.
Is there an API I can use to get the current state?
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hi.i need to export data from datagrid to excel.can you please help me or give me link that i can refer from it
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public string Convert(DataTable oDataTable, string directoryPath, string fileName)
{
string fullpath = "";
if (directoryPath.Substring(directoryPath.Length - 1,1) == @"\" ||directoryPath.Substring(directoryPath.Length - 1,1) == "/")
{
fullpath = directoryPath + fileName;
}
else
{
fullpath = directoryPath + @"\" + fileName;
}
StreamWriter SW;
SW=File.CreateText(fullpath);
StringBuilder oStringBuilder = new StringBuilder();
/*******************************************************************
* Start, Creating column header
* *****************************************************************/
foreach(DataColumn oDataColumn in oDataTable.Columns)
{
oStringBuilder.Append(oDataColumn.ColumnName + ",");
}
SW.WriteLine(oStringBuilder.ToString().Substring(0,oStringBuilder.ToString().Length - 1));
oStringBuilder.Length = 0;
/*******************************************************************
* End, Creating column header
* *****************************************************************/
/*******************************************************************
* Start, Creating rows
* *****************************************************************/
foreach(DataRow oDataRow in oDataTable.Rows)
{
foreach(DataColumn oDataColumn in oDataTable.Columns)
{
oStringBuilder.Append(oDataRow[oDataColumn.ColumnName] + ",");
}
SW.WriteLine(oStringBuilder.ToString().Substring(0,oStringBuilder.ToString().Length - 1));
oStringBuilder.Length = 0;
}
/*******************************************************************
* End, Creating rows
* *****************************************************************/
SW.Close();
return fullpath;
}
write the above code in a class file.
and write the below code in your button click event
string fileName = System.Guid.NewGuid().ToString().Replace("-","") + ".xls";
(new BLC.CSVConvertor()).Convert(Generatexlsheet() ,Server.MapPath("."),fileName);
Response.Redirect(fileName);
end of button click event
//below is the code for Generatexlsheet :
private DataTable Generatexlsheet()
{
String dbstr = BLC.Class1.Constring();
SqlConnection objconn = new SqlConnection(dbstr);
objconn.Open();
// SqlDataReader sqldr = null;
//
//
//
SqlCommand cmd = new SqlCommand("select * from employees",objconn);
// sqldr = cmd.ExecuteReader();
// int numbercols = sqldr.FieldCount;
SqlDataAdapter sqlda = new SqlDataAdapter(cmd) ;
DataTable dt = new DataTable();
sqlda.Fill(dt);
return dt;
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I have drawn an ellipse without problem.
Now i want to fill the top part with a red color and the bottom part with a blue color and i have no clue how to do it. Can anyone help me?
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u can try out
Graphics.FillPie() method
in this by specifying start ange and sweep angle u can fill pie in multicolors
rahul
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Tnx for the reply but what i actualy need is a kind of elipse health meter (like in diablo if u know it)
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I guess you could use a LinearGradientBrush for this.
Regards,
mav
--
Black holes are the places where God divided by 0...
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I already posted this message but I can't see it anywhere. Hope this time will work.
I need to receive a message from a message queue within MSMQ. I open the que
ue with a VBA code and set the "body" of the msgqueue. From a C# i access th
e queue and get the body but an exception occur:
Data at the root level is invalid. Line 1, position 1.
What can I do? Here follows the sw:
vba
Sub write_a_message_()
Dim strFormatName As String
Dim qinfo As New MSMQQueueInfo
Dim qDest As MSMQQueue
Dim msg As New MSMQMessage
strFormatName = ".\private$\test_per_coda_1"
On Error GoTo ErrorHandler
qinfo.PathName = strFormatName
Set qDest = qinfo.Open(MQ_SEND_ACCESS, MQ_DENY_NONE)
msg.Label = "Test Message"
msg.Body = "mickey goofy and donald"
msg.Send DestinationQueue:=qDest
qDest.Close
Exit Sub
ErrorHandler:
MsgBox "Error " + Hex(err.Number) + " was returned." _
+ Chr(13) + err.Description
end subthis works correctly
C# (where the problem occurs)
Message msg;
MessageQueue msgQ = new MessageQueue(@".\private$\test_per_coda_1");
msgQ.Formatter = new XmlMessageFormatter(new Type[] { typeof(string) });
msg = msgQ.Receive();
System.Console.WriteLine("massaggio ricevuto :: {0}", msg.Id);
System.Console.WriteLine("massaggio ricevuto :: " + msg.Body.ToString());
the exception occurring at the very last instruction is ::
Data at the root level is invalid. Line 1, position 1.
Then I have used another VBA code that receive the message, I had no problem
with manipulation of the "body".
Many thanks in advance and best regards
 
rodrigo
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I have C# Component say "SMSSender" and i setup a job in my sql server which call a DTS say "RecordFetcherAndSMS". This DTS fetch data from tables and create a message and want to call SMSSender.Send(string), a c# component. how i can do this.
Thanks
Zeeshan
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Hello all, I have run into a problem... I am trying to call a method from a thread but it is throwing an exception...
System.NullReferenceException was unhandled<br />
Message="Object reference not set to an instance of an object."<br />
Source="System.Windows.Forms"
Here is the code:
public void zap_publish_listview(zap item)<br />
{<br />
if (listView_main.InvokeRequired)<br />
{<br />
SetZapPublishListview s = new SetZapPublishListview(zap_publish_listview);<br />
Invoke(s, new object[] { item });<br />
}<br />
else<br />
{<br />
int icon = getStatusIconNumber(item.zap_state.ToString());<br />
string name = item.zap_channel.ToString();<br />
string data = item.zap_state.ToString();<br />
<br />
ListViewItem lvItem = new ListViewItem("", icon);<br />
lvItem.SubItems.Add("ZAP: " + name);<br />
lvItem.SubItems.Add(data);<br />
lvItem.ToolTipText = item.ToString();<br />
lvItem.Group = listView_main.Groups[2];
<br />
ListViewItem old_item = listView_main.FindItemWithText("ZAP: " + name, true, 0);<br />
<br />
if (old_item.Index >= 0)<br />
{<br />
listView_main.Items.Insert(old_item.Index, lvItem);<br />
<br />
listView_main.Items.RemoveAt(old_item.Index);<br />
}<br />
else<br />
{<br />
listView_main.Items.AddRange(new ListViewItem[] { lvItem });<br />
}<br />
}<br />
}<br />
I have a similar method that updates a debug window... And that works fine... Can anyone help???
Thanks in advance,
Phil
"Rules are for the obedience of fools and the guidance of wise men"
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Have you set a breakpoint to work out exactly which line throws the error ?
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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Hello,
I would like to "display" a Word document in a winform.
I can access a word document via Microsoft.Office.Word but I could not find how
to put the word document in a WinForm.
I have managed to do it through IE but is there no way through ActiveX or anything?
What is the right way to do this ?
Thanks for your help
Robert
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