Button in MDI floating over my child forms - C# Discussion Boards

Button in MDI floating over my child forms

26-Apr-08 16:44

I hope you're joking.

Try reading the forum guidelines, and the article I link to in my sig. Also, consider that a book, or even an online article, will provide more indepth help that is more suited to a base line question like that one.

Christian Graus

Please read this if you don't understand the answer I've given you

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Re: question

Krazy Programmer26-Apr-08 19:11

Krazy Programmer

26-Apr-08 19:11

hi dude.
This question proves that you are a beginner . try searching google for your question....here you can get only suggestions.. like read books , ' what is google ' ........... its better to have a search on google before asking a question...

Happy programming

Dont Get Paid for the Hours you worked, Get Paid for the Work You Have Done in an Hour.

how to use google

leckey27-Apr-08 14:55

leckey

27-Apr-08 14:55

Figure out that one first.

Current Rant: "What happened to REAL programmers?"
http://craptasticnation.blogspot.com/[^]

anjase26-Apr-08 12:02

anjase

26-Apr-08 12:02

Hi,
Got some problem with a set of buttons i've positioned in workspace area in my MDI-form. Not really GUI-standard but client wants it this way. The trouble is they "float" over every child form opened within my MDI (click event opens child form). Been looking in button class as well as form class for a property solving my problem. Thinking of something like "always on top"...

Kind of a newbie problem but any input most welcome!

Best Regards
Anders

Re: Button in MDI floating over my child forms

Krazy Programmer26-Apr-08 19:13

Krazy Programmer

26-Apr-08 19:13

Why dont you use a tool bar or menu bar for this ?

Dont Get Paid for the Hours you worked, Get Paid for the Work You Have Done in an Hour.

DllImport quick quetion please? [modified]

mktrend26-Apr-08 11:18

26-Apr-08 11:18

I must use the functions in an unmanaged DLL. The function prototype is as follows:

extern "C" double __stdcall AvgEntryPrice(LPSTR instrument, LPSTR account)
My best effort is below but it's not working, can I get some help on this please, thanks.

// PInvokeTest.cs<br />
using System;<br />
using System.Runtime.InteropServices;<br />
<br />
class PlatformInvokeTest<br />
{<br />
    [DllImport("NtDirect.dll")]<br />
    public static extern double AvgEntryPrice(string c, string c);<br />
<br />
    [DllImport("NtDirect.dll")]<br />
    internal static extern int _flushall();<br />
<br />
    public static void Main()<br />
    {<br />
        AvgEntryPrice("ES08", "Sim101");<br />
        _flushall();<br />
    }<br />
}

modified on Saturday, April 26, 2008 5:25 PM

Christian Graus26-Apr-08 11:22

26-Apr-08 11:22

How do you know it's not working, if the dll never returns anything to you ?

I assume this is not a Windows dll. www.pinvoke.net has lots of signatures for windows dlls. They have some info too, it may still help. But, this looks OK to me.

mktrend26-Apr-08 11:28

26-Apr-08 11:28

Hi, thanks for your response.
1-I get the "The parameter name 'c' is a duplicate'
which is from the line where it says ....AvgEntryPrice(string c, string c);....

p.s. edited
OK,I took care of this problem! it now reads the following am going to chec it agais now.

AvgEntryPrice(string instrument, string account);

Christian Graus26-Apr-08 11:34

26-Apr-08 11:34

Oh - that self explanatory then. You can't have two parameters with the same name. Sorry, that's just so obvious that I missed it, I was looking for a p/invoke problem, not a general coding one.

mktrend26-Apr-08 11:37

26-Apr-08 11:37

I don't get any build error after correcting the above problem but when running the .exe I get the following error:

Failed to initialize COM library (0x80010106).

Christian Graus26-Apr-08 11:43

26-Apr-08 11:43

OK, now your code works, but you have a problem with this dll. If it's a COM dll, you should import it into your project, not use p/invoke. Otherwise, read the docs for the dll, to work out why you're calling it incorrectly.

mktrend26-Apr-08 11:53

26-Apr-08 11:53

in the DOS win, it gives the following message. BTW line 15 is ..AvgEntryPrice("ES08", "Sim101");
I also put the DLL in the same dir as the .exe

AvgEntryPrice("ES08", "Sim101");

Unhandled Exception: System.AccessViolationException: Attempted to read or write
protected memory. This is often an indication that other memory is corrupt.
at PlatformInvokeTest.AvgEntryPrice(String instrument, String account)
at PlatformInvokeTest.Main() in C:\Documents and Settings\k\My Documents\C# C
odes\DLL Methods\ConsoleApplication2\ConsoleApplication2\Program.cs:line 15

mktrend27-Apr-08 1:43

27-Apr-08 1:43

Hi Christian,
thanks your response.
1- this is not a COM dll, should I still import the dll? if yes, then how? the dll cannot be referenced!
2- the dll has no docs, the only thing about it is that it uses the _stdcall convention and in my MATLAB procedure that works successfully using the loadlibrary function, I must include the _stdcall in the prototype also I had to create a header file for it too.

thanks

mktrend26-Apr-08 12:24

26-Apr-08 12:24

I hope maybe this info might help to put me on the right track.
I have no problem using the DLL via MATLAB for which I made a header file .h and then just use the loadlibrary and the callib and it gets the job done!
What is the equivalent way of doing the same in C#?
thanks

mktrend27-Apr-08 1:37

27-Apr-08 1:37

This is a modified version of my code, after correcting a couple of minor problems. It builds fine but running it causes the same error!
I have the below questions:
1- the dll uses _stdcall, should I include that anywhere in my code?
2- how can I insert the setdllpath in my code to make sure the path to the dll and it's dependents are all included in the search?
3- why is the error seeing the dll as a COM?
thanks

using System;<br />
using System.Runtime.InteropServices;<br />
<br />
class PlatformInvokeTest<br />
{<br />
    [DllImport("NtDirect.dll")]<br />
    public static extern double MarketData(string instrument, int type);<br />
<br />
    [DllImport("NtDirect.dll")]<br />
    internal static extern int _flushall();<br />
<br />
    public static void Main()<br />
        <br />
    {<br />
        string instrument = "ER2 06-08";<br />
        int type = 0;<br />
        MarketData(instrument, type);<br />
        _flushall();<br />
    }<br />
}

Conversion Problem....

AliNajjar26-Apr-08 10:49

AliNajjar

26-Apr-08 10:49

Hi everybody.
I want to know if there is an equivalant in C# for the "Variant" type in Delphi.
Any ideas. A tiny example would be great.
thank in advance

Christian Graus26-Apr-08 11:23

26-Apr-08 11:23

No, there's no variant that I know of, if variant is the same in Delphi as it is in VB. A variant means it can be anything, but you define what it is, right ? Easy to write one. Or you can use object and use the gettype function to work out what type is stored.

Why do you need it ?

AliNajjar26-Apr-08 11:38

AliNajjar

26-Apr-08 11:38

Thanks for reply..

In Delphi, I use Variant type to declare these variables (ComplexNum : Variant) . But I don't know how
to do so in C#...

What I need this for is to deal with complex numbers (((and arrays of it)))).
So...
In Delphi,
I use Variant type to declare these variables (ComplexNum : Variant) OR (ComplexNumArray : array of Variant).
But I don't know how to do so in C#
Any Ideas???
Thanks so much>>>

Christian Graus26-Apr-08 11:42

26-Apr-08 11:42

Looks[^] like there's a number of complex number libraries for C#.