Re: Marshaling Object - C# Discussion Boards

Re: string problem ? help please ¿

6-Jul-06 23:15

Hello

You can parse and excute C# statements from text files but in your case it's not worth it. Instead you should store the names of your controls, and the the values. Then you might want to check them with if/else if statements. eg:

string MyReadLine = TextFile.ReadLine();
if(MyReadLine.StartWith("TabPage1"))
{
    string temp = MyReadLine.SubString(8);
    tabPage1.Text = temp;
}
else if(...

Another more advanced approach would be Reflection. Just type Reflection in your MSDN's index. Yet again I don't think it's worth it.

Regards Rose | [Rose]

Anh_Tuan7-Jul-06 2:18

Re: string problem ? help please ¿

7-Jul-06 2:18

Try to see Globalization on this site like these:

http://www.codeproject.com/dotnet/globitfrmwk.asp[^]

http://www.codeproject.com/csharp/multilanguageapplications.asp[^]

Jup

V.7-Jul-06 1:10

7-Jul-06 1:10

You could find some info on ResourceManager and Culture Classes.

I've found a living worth working for, but I haven't found work worth living for.

<marquee> Beer | [beer]

instance of a crystal report

cellardoor07166-Jul-06 22:25

cellardoor0716

6-Jul-06 22:25

I made a simple report CrystalReport1.rpt which was added to my project (Add New Item => Crystal Report) I want to use the report in my project, but i don´t know how to create an instance of it...
I tried CrystalReport1 report = new CrystalReport1(); but that doesn´t work, i always get error: The type or namespace name 'CrystalReport1' could not be found (are you missing a using directive or an assembly reference?)

cellardoor

Re: instance of a crystal report

V.7-Jul-06 1:14

7-Jul-06 1:14

>Read up on how to use Crystal Reports in in VS.

You need to initialize the Crystal Reports Viewer and attach the report to it.
It's been a long time, but I remember looking that stuff up on MSDN[^].

there is an object model on there somewhere as well.
good luck.

I've found a living worth working for, but I haven't found work worth living for.

<marquee> Beer | [beer]

Marshaling Object

Anh_Tuan6-Jul-06 22:22

6-Jul-06 22:22

Hi,

I have applications that need to communicate with each other using HWND_BROADCAST

Here is the prototype for unmanged code function SendMessage

[DllImport("user32.dll")]<br />
extern static IntPtr SendMessage(IntPtr hWnd, int msg, MyClass myClass, IntPtr lParam);

where WParam is passed as an object reference.

In the overriden WndProc method on the other application, the WParam variable is marshaled back to the original object like this

protected override void WndProc(ref Message m)<br />
{<br />
if (m.Msg == CommonMessageID)<br />
{<br />
...<br />
// myClass contains junk data here<br />
MyClass myClass = (MyClass)Marshal.PtrToStructure(m.WParam, typeof(MyClass));<br />
...<br />
}<br />
base.WndProc(ref m);<br />
}

However, it does not hold the information that was initialized by the other app. What did I do wrong here?

Jup

Re: Marshaling Object

mav.northwind7-Jul-06 1:14

mav.northwind

7-Jul-06 1:14

Hi!
You cannot simply stuff an object into an arbitrary SendMessage call and expect it to appear unchanged at another application.
SendMessage is sending pointers as parameters (wPar, lPar), but these pointers point to an adress in the current process adress space!

You can transmit simple datatypes (int) that way but no objects. In Win32 there's a special message WM_COPYDATA that's used to transfer data from one process to another, but I strongly doubt that this will solve your problem.

For transfering objects (or rather object references) you should use .NET Remoting.

Regards,
mav

--
Black holes are the places where god divided by 0...

Re: Marshaling Object

Anh_Tuan7-Jul-06 3:20

running a function in a thread

7-Jul-06 3:20

Thanks, you're right. I forgot about address space. Should I access other's process address space to read/write data?

Jup

Mridang Agarwalla6-Jul-06 22:21

Mridang Agarwalla

6-Jul-06 22:21

i havea function in my app called CheckStatus. This take no prameters and returna a boolean value as the result. I am using it in a if..else statement like this:

if (CheckStatus() == true)<br />
    //Do somethins here<br />
else<br />
    //Do something else here<br />

Now what happening is that CheckStatus function takes some time to process and due to this my UI becomes non responsive. How can i acheive the above functionality by putting it in a separate thread. I'm pretty new to using Threading so it'd be great if someone could explain in a bit of detail. Thaks in advance!

Re: running a function in a thread

Anh_Tuan6-Jul-06 22:32

Re: running a function in a thread

6-Jul-06 22:32

Create a new thread to process time-consuming tasks.

Here is a simple example

using System.Threading;
...

ThreadStart ts = new ThreadStart(DoWork);
Thread t = new Thread(ts);
t.Start();

...

void DoWork()
{
// do my work here
}

Check out more at at Threading articles on here or MSDN Lib.[^]

Jup

Adadurov7-Jul-06 0:22

Adadurov

7-Jul-06 0:22

I use to do it like this:

class SomeClass<br />
{<br />
  public Routine1()<br />
  {<br />
    // Show "Wait" cursor (hour-glass)<br />
    System.Windows.Forms.Cursor.Current = System.Windows.Forms.Cursors.WaitCursor;<br />
<br />
    // reset completion flag<br />
    workDone = false;<br />
<br />
    ThreadStart ts = new ThreadStart(DoWorkWithStatusChecking);<br />
    Thread t = new Thread(ts);<br />
    t.Start();<br />
<br />
    // in this loop we wait for completion and<br />
    // processing GUI messages.<br />
    while( ! t.IsDone this.workDone )<br />
    {<br />
      // If you need to prevent user's interaction with GUI<br />
      // (clicking around, pressing buttons, etc.)<br />
      // you can pass message filter to Application.DoEvents()<br />
      System.Windows.Forms.Application.DoEvents();<br />
      // following line is here to prevent 100% CPU load<br />
      // but some people think it's not necessary<br />
      // i just dont have time to check it, 'cause it works just fine<br />
      Sleep(0);<br />
    }<br />
  }<br />
<br />
  bool workDone = false;<br />
<br />
  void DoWorkWithStatusChecking()<br />
  {<br />
    // This is what you want to do after status-checking.<br />
    if( this.Status )<br />
    {<br />
    }<br />
    else<br />
    {<br />
    }<br />
<br />
    // ... done, set <br />
    this.workDone = true;<br />
  }<br />
<br />
  bool CheckStatus()<br />
  {<br />
    // ... real status checking here<br />
<br />
    return ( true | false );<br />
  }<br />
} // end class SomeClass

Note: routine1 is not reenterable and must be guarded by some sort of guard condition in the beginning!

got the idea?

Alexei.

create custom database [modified]

z1z16-Jul-06 22:14

z1z1

6-Jul-06 22:14

hi, i want to creat a custom database which will read data from an unknown file format(made by me) and it will not use any database server...how will i do it? plz help me to solve that..

Re: create custom database

Paul Conrad6-Jul-06 23:18

Paul Conrad

6-Jul-06 23:18

combo box issue

V.6-Jul-06 22:10

6-Jul-06 22:10

Hi,

I have the following problem.
When the dialog opens I set up a bunch of combos with database values. After loading them, I set a default value. This all works except for 1 combo (first value gets selected). The strange thing however, is that I have a reset button, which does the exact same thing and then suddenly that default value is set correct.

That combobox is loaded dependent on the contents of the previous one, but I'm sure he does not come in the selectedindex_changed event after the default value was set. (I checked this).

I also compared the properties of the different combo boxes. They are the same.

Can anybody help me on this issue?
Thanks !

I've found a living worth working for, but I haven't found work worth living for.

<marquee> Beer | [beer]

exporting int array from c++ dll to c# client

Tugberk_Kara6-Jul-06 22:07

Tugberk_Kara

6-Jul-06 22:07

I have a function in cpp file returning int * array and taking int * array as a parameter. It is as:

int * funcArg(int *a ) {
int DLLArg [] = {100,200,300};
a=DLLArg;

return a;
};

I have exported this function in the dll (i have checked it with dumpbin.exe)

But I can not handle this function in c# client. My code in c# is as: ( ıt gives this error. "An unhandled exception of type 'System.Runtime.InteropServices.SafeArrayRankMismatchException' occurred in CSharpClient.exe

Additional information: Safe array of rank 51241 has been passed to a method expecting an array of rank 1."

What should I do? URGENT help!!!

namespace CSharpClient
{

class Class1
{
[DllImport("DenemeNonMfcDll.dll",EntryPoint="?Sub@DLLclass@@QAEHHH@Z")]
public extern static int Sub(int a, int b);

[DllImport("DenemeNonMfcDll.dll")]
[return: MarshalAs(UnmanagedType.SafeArray)]
public extern static int [] funcArg(int [] a);

public static int [] intArray = new int [3] {0,1,2} ;

static void Main(string[] args)
{

foreach (int num in funcArg(intArray) )
{
System.Console.WriteLine(num.ToString());
}

Console.WriteLine("Press any key to continue...");
Console.ReadLine();
}
}
}

Outlook automation in Citrix MetaFrame supresses notifications [modified]

Corinna John6-Jul-06 22:03

Corinna John

6-Jul-06 22:03

Hello Everybody,

I have an application running in a Citrix MetaFrame. That application automates Outlook so read the user's inbox and send emails. I create and release the outlook instance like that:

Application outlook = new ApplicationClass();
try
{
  DoSomething(outlook);
}
finally
{
  Marshal.ReleaseComObject(outlook);
  outlook = null;
}

[EDIT]I cannot call outlook.quit(), because it would also close all local instances, if you run the application locally (outside MetaFrame).[/EDIT]

It works fine. The users run the application in the MetaFrame and their visible Outlook instances locally on their desktops.
The only problem is: They forget going to meetings, because Outlook doesn't show them any notifications a few minutes before an Appointment starts. The remote Outlook (running invisibly in the MetaFrame) prevents the local Oulook from showing the notifications.

For example, you add an appointment to your calendar folder and configure a reminder 10 minutes before starting time. So, you expect Outlook's notify-window to pop up ten minutes before the appointment.
It does pop up, if nothing is running via Citrix at the moment. But if my application is running, there will be no notify-windows, the local Outlook instance won't show any reminders.

What is the problem? Does anyone know why the calendar reminders don't work locally, while there's another instance running in a Citrix MetaFrame? Please tell me... Rose | [Rose]

Thanks in advance,
coco

_____________________________________________________________________________
I don't expect too much, all I want is your vote for Halbsichtigkeit.

-- modified at 4:03 Friday 7th July, 2006

MousePosition vs lParam

syedhassan46-Jul-06 21:11

syedhassan4

6-Jul-06 21:11

Why values are not same? I simple want to find the position of Cursor through LParam. But calculated values are different.

<br />
Point screenMousePointOld = Control.MousePosition;<br />
Point screenMousePoint = new Point(LoWord(message.LParam.ToInt32()), HiWord(message.LParam.ToInt32()));<br />

<br />
private static int HiWord(int number)<br />
{<br />
	if ((number & 0x80000000) == 0x80000000)<br />
		return (number >> 16);<br />
	else<br />
		return (number >> 16) & 0xffff ;<br />
}<br />
<br />
private static int LoWord(int number)<br />
{<br />
	return number & 0xffff;<br />
}<br />

What I am doing wrong?

Re: MousePosition vs lParam

fang_eric6-Jul-06 21:20

fang_eric

6-Jul-06 21:20

Since LParam is 64 bit number, so you have to convert it to int64 type.

hourglass mouse still clicking

lushgrass6-Jul-06 19:53

lushgrass

6-Jul-06 19:53

hi. i am trying to prevent the form from queueing repeat clicks.
i set the cursor to wait, but when the user clicks on a menu button it queues the command still.
i want it to ignore the command.
how do i do this?

i tried the following:

if(cursor.current == cursors.waitcursor)
return;
cursor.current = cursors.waitcursor;

Nader Elshehabi6-Jul-06 20:38

6-Jul-06 20:38

Hello
Check the MouseCapture property. Set it to true in an irrelevant control of your form -eg. the statusbar-, this way it will capture the mouse and no other control will respond to hovering or clicking, until you release the capture again by setting it to false in the same control.

Regards Rose | [Rose]

lushgrass6-Jul-06 21:02

lushgrass

6-Jul-06 21:02

can you please elaborate?
which mouse capture?

Nader Elshehabi6-Jul-06 21:22

6-Jul-06 21:22

Hello
There is a Control.Capture property in all controls. When you set it to true in any control, it will capture the mouse and the mouse click won't work until you click on something else once, then the control will lose its capture and the second click will work -remember: the first won't do anything- This will give you a chance to handle the MouseCaptureChanged event of that control to check if you intentionally released the mouse -you might want to use a boolean here-, or if the user clicked somewhere. If so, it will recapture the mouse. Here is a code snippit:

bool Release;
public void MyMethod()
{
     Release = false;
     UseWaitCursor = true;
     MyControl.Capture = true;
     //Do a lengthy operation...
     UseWaitCursor = false;
     Release = true;
     MyControl.Capture = false;
}

private void MyControl_MouseCaptureChanged(object sender, EventArgs e)
        {
            if(!Release)
               MyControl.Capture = true;
        }

Regards

lushgrass6-Jul-06 22:24

lushgrass

6-Jul-06 22:24

how do i associate the method with my control?

Nader Elshehabi6-Jul-06 22:58