C# Discussion Boards - CodeProject

26-May-02 5:31

System.Windows.Forms.Application.ExecutablePath tells you where the executable is located that started the application. You can also use the StartupPath property, they both appear to do the same thing.

System.Diagnostics.Debug class has lots of methods for you to use; there is also the System.Diagnostics.Trace class which I use more often for no justifiable reason Poke tongue | ;-P

.

James

Simplicity Rules!

Re: File I/O In C#

Nick Parker26-May-02 5:39

Nick Parker

26-May-02 5:39

Thanks James, that's exactly what I was looking for. Smile | :)

Nick Parker

Messenger API & C#

Rocky Moore25-May-02 6:22

Rocky Moore

25-May-02 6:22

Has anyone played with the Microsoft Messenger API in C#? For some reason I cannot get it to sink and event (assign a delegate).

Rocky Moore

Nish Nishant25-May-02 6:57

25-May-02 6:57

I didn't even know that they had one. What all can it do? And where can I get it from?

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Rocky Moore25-May-02 12:41

Rocky Moore

25-May-02 12:41

Nish - Native CPian wrote:
I didn't even know that they had one. What all can it do? And where can I get it from?

It is COM but here is the link:

http://msdn.microsoft.com/downloads/default.asp?url=/downloads/topic.asp?url=/msdn-files/028/001/359/topic.xml

Supposed to be able to do quite a bit. Wanted to play with it but seems to blow when I try to set a delegate.

Rocky Moore

Nish Nishant25-May-02 15:33

25-May-02 15:33

Rocky Moore wrote:

It is COM but here is the link:

Thanks! I was hoping there was a fully .NET version

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

SimonS25-May-02 10:25

SimonS

25-May-02 10:25

Does Messenger have native support for .NET now?
The last time I looked it was still COM, or is this what you're having problems with?

Cheers,
Simon

"Every good work of software starts by scratching a developer's personal itch.", Eric S. Raymond

Console in Windows

24-May-02 13:46

I Createed a WindowsApplication in c#. I Noticed all the Console.* functions still compile but of course no console appears. How can i make the console show up?Its usefull to print messeges to there for debug Roll eyes | :rolleyes:

thank you

zhoujun24-May-02 15:27

zhoujun

24-May-02 15:27

why not write the debug info in a textbox? Smile | :)

Nish Nishant25-May-02 4:07

25-May-02 4:07

You can log all messages to a file for debugging purposes

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

James T. Johnson25-May-02 4:18

25-May-02 4:18

If you want, you can compile your application as a console application, and it will still work as a windows app (forms and all) but the console will always be displayed.

You can change the type from the Project's properties dialog.

James

Simplicity Rules!

Nish Nishant25-May-02 6:58

25-May-02 6:58

James T. Johnson wrote:
If you want, you can compile your application as a console application

Blast! Why didn't I think of that Frown | :-(

Nish

Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.

Crystal Reports Not Working

Phil Bolduc27-May-02 13:51

Phil Bolduc

27-May-02 13:51

Even better is to use the log4net framework. Allows you integrate logging into your application. See: http://sourceforge.net/projects/log4net/

This way you can enable logging for a particular part of your application without having to change any source or recompile. Just modify the configuration file.

Laugh | :laugh:

Phil Bolduc
Vancouver, BC Canada

PreProcessMessage

24-May-02 4:30

I am trying to overload this method on a form and capture the WM_LBUTTONDOWN message. I am fairly new to C# and could someone guide me how to do it.

Thanks

Re: PreProcessMessage

Joshua Nussbaum24-May-02 6:27

Joshua Nussbaum

24-May-02 6:27

Handle the MouseDown event

create a function like this

public class MyForm : System.Windows.Forms.Form {

protected override void OnMouseDown(MouseEventArgs e) {
if (e.Button == MouseButtons.Left)
MessageBox.Show(this, "You clicked the left button");
else
MessageBox.Show(this, "You clicked some other button");
}
}

Gavin_Mannion24-May-02 3:55

Gavin_Mannion

24-May-02 3:55

Hi All,

I am still stuck trying to get some Crystal Reports working.
From what I have found out all my code is correct and I must just be missing something else.
Now the thing is I have no idea what that something else is.

I have downloaded the samples from Crystal Decisions and used them and I get the same error message.

Object reference not set to an instance of an object. 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  

Stack Trace: 


[NullReferenceException: Object reference not set to an instance of an object.]
   CrystalDecisions.Web..get_7() +189
   CrystalDecisions.Web.CrystalReportViewer.OnInit(EventArgs e) +352
   System.Web.UI.Control.InitRecursive(Control namingContainer) +235
   System.Web.UI.Control.InitRecursive(Control namingContainer) +179
   System.Web.UI.Control.InitRecursive(Control namingContainer) +179
   System.Web.UI.Page.ProcessRequestMain() +169

 


--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:1.0.3705.0; ASP.NET Version:1.0.3705.0

Could someone please tell me what I am doing wrong here?

Thanks,
Gavin

MDIChild Activated() event not firing......

Pranoti24-May-02 1:45

Pranoti

24-May-02 1:45

Hello Friends,

I'm developing one MDI application.
In that I want to perform some task in ACtivated() event of each child.But whenever I'm activating MDIChild, activated() event of that child is not firing. Thats why I'm unable to perform my task.

Has anybody having any idea about this.

Thanks in advance.

Pranoti

Re: MDIChild Activated() event not firing......

Rocky Moore24-May-02 19:17

Rocky Moore

24-May-02 19:17

Try using the MdiChildActivate instead for MDI child windows.

Rocky Moore

Sockets/Objects/Serializable

Paddy24-May-02 1:30

Paddy

24-May-02 1:30

I'm new to C# and was looking for help on sending objects through sockets.

I have a program(which I got from this site) that sends bytes through a socket, it's a client/server chat program. I have written a class and made it Serializable and am trying to send instances of my class through the socket but haven't a clue how to actually serialize the object into bytes and send it through the socket.

Hope someone can help,
Paddy.

James T. Johnson24-May-02 7:54

24-May-02 7:54

public byte[] GetObjectBytes(object o)
{
  MemoryStream memstream = new MemoryStream();
  IFormatter formatter = new BinaryFormatter();
 
  formatter.Serialize(memstream, o);
 
  memstream.Close(); // Prevent further writing
 
  return memstream.GetBuffer();
}
 
public object GetObjectFromBytes(byte [] bytes)
{
  MemoryStream memstream = new MemoryStream(bytes);
  IFormatter formatter = new BinaryFormatter();
 
  object o = formatter.Deserialize(memstream);
 
  memstream.Close();
 
  return o;
}

I'm not a network guy, but I assume you just call the Write method on the NetworkStream object representing your socket, to send the byte array, then call the Read method on the other side to read back the byte array.

GetObjectBytes() will serialize the object and return the byte array which you can pass to Write, GetObjectFromBytes() will deserialize the byte array from the Read method.

HTH,

James

Simplicity Rules!

tmagoo24-May-02 19:39

tmagoo

24-May-02 19:39

I am having sort of the same problems as you are. Instead I am trying to make class variables equal to the bytes returned from the socket. I sort of understand what James T. Johnson is giving you advise on; but, I don't know how to make a custom object in C#. Since I am using class variables instead of objects, I am leaving you this test code to show you how I convert the byte types to the variables in a class. This example requires the knowledge of byte masking and the use of Reflection. I am hoping to get some feedback plus maybe show you something new dealing with Reflection.

using System;
using System.Reflection;

namespace ConvertTypes
{
///

/// Summary description for ConvertTypes.
///

///

class ConvertClass
{
public int x;
public int y;
public bool z;

public ConvertClass(int i, int j, bool k)
{
x = i;
y = j;
z = k;
}

// Set the converted value
public void SetConvertClass(int i, string sName)
{
if(sName == "x")
x = i;
else
y = i;
}
}

class clsConvertTypes
{
///

/// The main entry point for the application.
///

[STAThread]
static void Main(string[] args)
{
ConvertClass mCls = new ConvertClass(0,0,true);

//Declare 8 Bytes for 2 int's
byte [] bTest = new Byte[8];

// get a Type Object representing ConvertClass
Type t = typeof(ConvertClass);

// get the fields from the Type object (ie int x, int y)
FieldInfo [] fi = t.GetFields();

// Start at index 0 which represents the x field
int iIndex = 0;

//Build the x value as 500000 and the y value as 400000
bTest[0] = 0x00; // 0x0007A120 = 500000
bTest[1] = 0x07;
bTest[2] = 0xA1;
bTest[3] = 0x20;
bTest[4] = 0x00; // 0x00061A80 = 400000
bTest[5] = 0x06;
bTest[6] = 0x1A;
bTest[7] = 0x80;

foreach(FieldInfo FI in fi)
{
if(FI.FieldType == typeof(int))
{
// Declare a temporary integer variable
int iTemp;

// Mask the byte array into a single integer
iTemp = (int)((bTest[iIndex]<<24) | (bTest[iIndex+1] << 16) |
(bTest[iIndex+2] << 8) | bTest[iIndex+3]);

// increment the index by 4 bytes since it is a int
iIndex = iIndex + 4;

// Declare an object which will be used to pass
// parameters to the SetConvertClass method
object[] targs = new Object[2];
targs[0] = iTemp; //First argument
targs[1] = FI.Name; //Second argument (x or y)

// Get all methods associated with ConvertClass
MethodInfo[] mi = t.GetMethods();

foreach(MethodInfo m in mi)
{
//Compare to the name of the method
if(m.Name.CompareTo("SetConvertClass") == 0)
{
Console.WriteLine("Setting the {0} value to {1}",
FI.Name,iTemp);
//Invoke the method using Reflection
m.Invoke(mCls,targs);
}
}
}
else
Console.WriteLine ("Don't do anything with the {0} field",
FI.Name);

}

Console.WriteLine("x is {0} y is {1}",mCls.x,mCls.y);
}

}

}

The Long Way,

Tom McDaniel

James T. Johnson25-May-02 4:17

25-May-02 4:17

That's pretty what the binary serializer does except it has type safety built in.

Using the methods I created you would do something like this.

private byte[] GetMyClassBytes(MyClass mc)
{
  return GetObjectBytes(mc);
}
 
private MyClass GetMyClassFromBytes(byte[] bytes)
{
  return (MyClass) GetObjectFromBytes(bytes);
}

To go from object to a specifc class you just need to cast or use the as keyword if you don't want to throw an exception if it is the wrong type (return GetObjectFromBytes(bytes) as MyClass returns null if the object isn't of type MyClass).

James

Simplicity Rules!