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Hi,
I think my problem is easy to solve, but I'm giving too much time while I can solve it in other ways (uglier ones...).
That's it:
I've got a form which instantiates a simple form to get a user & pwd. When the Show method is finished I would like to get the values of the strings (properties) in the calling form. I can do it creating two public strings at the called form which are initialized to the Edit Controls value and read by the calling form when the Show method finishes.
It's a simple solution, but I want a better one:
Is it possible to pass the reference of the local strings to the constructor of the called form so when the Show method finishes the calling form already has the initialized values?
I also tried to use Marshal interface and IntPtr, but the solution became uglier by moments...
Does anyone know how to manage it?, is it possible?, maybe is there any similar solution which save me to create to public strings in the called form?
Thank you in advance,
Edgar
__________________________________________
Edgar Berengena Moreno
Software Engineer
Appeyron Research
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Default param passing is by ref, so nothing prevents you from the caller Form to do this :
Form2 f = new Form2();
f.SetFormData(m_arrayData);
f.Show();
where m_arrayData is whatever collection, such as System.Collections.ArrayList for instance.
Be warned though that .Show() returns immediately after the Form is displayed, thus you never know when the collection is updated, etc. Unless instead of passing a collection, you pass a class with a collection member and a SetDirty() method to tell the caller.
Another interesting point is that the Form2 subform should not call you, but instead raise an event the caller Form has subscribed for. That's much more standard C#/Java programming-style.
See http://www.codeproject.com/csharp/delegates-part1.asp[^]
And I swallow a small raisin.
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I used the wrapper to make my C# program to recognize the datatype win32_find_Data, however, the compiler doesn't accept the IntPtr as the return type for function "Findfirstfile", what's the solution for this? Following is the sample code:
struct FILETIME
{
int dwLowDateTime;
int dwHighDateTime;
}
struct WIN32_FIND_DATA
{
int dwFileAttributes;
FILETIME ftCreationTime;
FILETIME ftLastAccessTime;
FILETIME ftLastWriteTime;
int nFileSizeHigh;
int nFileSizeLow;
int dwReserved0;
int dwReserved1;
string cFileName; //mite need marshalling, TCHAR size = MAX_PATH???
string cAlternateFileName; //mite need marshalling, TCHAR size = 14
}
[DllImport("kernel32.dll")]
static extern IntPtr FindFirstFile( IntPtr lpfilename, ref WIN32_FIND_DATA
findfiledata);
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Declaration :
[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
public struct FILETIME
{
public Int32 dwLowDateTime;
public Int32 dwHighDateTime;
}
[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
public struct WIN32_FIND_DATA
{
public Int32 dwFileAttributes;
public FILETIME ftCreationTime;
public FILETIME ftLastAccessTime;
public FILETIME ftLastWriteTime;
public Int32 nFileSizeHigh;
public Int32 nFileSizeLow;
public Int32 dwReserved0;
public Int32 dwReserved1;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst= 260)]public string cFileName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst= 14)]public string cAlternateFileName;
}
[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr FindFirstFile( string lpfilename,
out WIN32_FIND_DATA findfiledata);
Usage :
String s = @"*.js";
WIN32Wrapper.WIN32_FIND_DATA findfiledata;
IntPtr handle = WIN32Wrapper.FindFirstFile( s, out findfiledata);
And I swallow a small raisin.
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well, still encounter the same problem.
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Works fine for me,
If you have a problem compiling this code, then the bug is trivial, it is not even a marshalling problem,
And I swallow a small raisin.
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 I need opinions on how to build the following component...
The file server holds 5 XML files. These 5 XML files (yes, only five) contain all of the data for a rather large enterprise-level application. I need to create a single object to be used in both a web application and a Windows application. Both of these applications will need to insert, update, select, and delete XML nodes and attributes from these same files at the same time.
Obviously, my concerns are file locking and massive memory consumption using multiple instances of this object. Also, the data in each of these files cannot be out of sync at any moment.
Unfortunately, I cannot deviate from these requirements. I'd like some advice on creating the object and using these five files. Any and all ideas are welcome.
Thanx,
Ryan
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I guess the IDataSet object would be fine, as it stores data in native Xml, allows to work offline, loads/saves xml, ...
God luck,
And I swallow a small raisin.
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Yeah, but how will it handle multiple requests coming in for the same instance of the document?
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There is no free lunch whatsoever, you'll have to code something someday...
But IDataSet manage states such like what you may imagine behind methods like HasChanges(), GetChanges(), RejectChanges(), ...
You should give it a try.
And I swallow a small raisin.
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I would like to write a C# program that will allow me create and/or load the image file of a floppy over our company intranet.
I was reading that the WMI in VC++ is the same as the System.Management Namespace in C#. I was wondering if I could use this to achive my goal. Please, let me know if I'm even on the right track. I don't even know what a Management Object is!
Thanks,
TeraCoder
Me, wrong!?! Nah, you just need to change your thinking to make me right.
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Can any one help in finding tutorial/sample for Serial Port Communication (COM)in C#.
thanks,
Sanjeev
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Check this article out ...
http://www.devhood.com/tutorials/tutorial_details.aspx?tutorial_id=320
though the author's picture is a bit of a worry 
- James
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I read that article but I don't want to use ActiveX control...
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There is an example on MSDN - but I don't have the link handy. No ActiveX, a complete Win32 wrap. It is written in VB however, so you would have to translate it to C#. I'm considering doing that myself, but I'm not sure I could get it right
Bill F
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its probably been asked before, but, i need to find out the icon for a folder, cd drive, etc, i believe this is in the shell32.dll file, but i am not sure how to load resources forom files.
 Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."
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You really need not look further than home. 
David Stone
But Clinton wasn't a predictable, boring, aging, lying, eloquent, maintainer-of-the-status-quo. He was a predictable, boring-but-trying-to-look-hip, aging-and-fat-but-seemingly-oblivious-to-it, lying-but-in-sadly-blatant-ways, not-eloquent-but-trying-to-make-up-for-it-by-talking-even-more, bringer-in-of-scary-and-potentially-dangerous-new-policies. And there was also Al Gore. It just wasn't *right*.
Shog9
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I get an error when I try to do something like:
byte[] myByte;
myByte = (byte[])e.PostData;
Am I doing this wrong?
Nick Parker
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Could you show an example, or do you know of a link to one?
Nick Parker
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