|
Can I use direct Win32 API functions in C# or
I have to write extra dll file in Visual C++
where I can use Win32 API functions?
For examples can I direct in C# write code
for eject CD or I have to write a dll file
in Visual C++ where I can use Win32 API
functions?
|
|
|
|
|
|
Thank you very much  ))
|
|
|
|
|
zlaty wrote:
Can I use direct Win32 API functions in C#
Yes. Serach for DllImport in MSDN and this site.
Mazy
"A useless but amusing fact is that if all the DNA in all the cells in a single human being were stretched out it would reach the moon and back eight thousand times." - Steve Jones
|
|
|
|
|
Thank you very much ))
|
|
|
|
|
Apparently we posted at the same minute but I obviously beat you by at least a second.
- Nick Parker
My Blog
|
|
|
|
|
Damn to my slow connection. 
Mazy
"A useless but amusing fact is that if all the DNA in all the cells in a single human being were stretched out it would reach the moon and back eight thousand times." - Steve Jones
|
|
|
|
|
Hello,
Here is my question.
I have a main class that contains my apps form, call it Form1.cs. The form has some text boxes.
Know, I added another class to my project, Other.cs, and I want this class to write text out to the text boxes on Form.cs.
The textbox is called textOut. I tried to use this line in Other.cs "Form1.textOut.Text = ..." but I get this error: An object reference is required for the nonstatic field, method, or property 'BurCoat1.Form1.textOut'
So do I have to create a Form1 object in Other.cs? One is already made in Form1's main method:
"Application.Run(new Form1());"
I tried to make a global Form1 object in Form1.cs and use that one, but it still didnt work.
Can someone give me some suggestions please or tell me what I am doing wrong?
Thanx a lot,
-Flack
|
|
|
|
|
|
You need to get a reference to the form in some way.
Form1.textOut.Text = ... doesn't work because you're addressing the class definition itself, not an instance of it. Creating a new Form1 object in Other won't work either (although it will compile) because it will be an entirely separate intance of Form1, not the one on your screen.
I don't know how your app is set up, but this should give you an idea of how to go about it:
public class Form1{
public Form1(){
...
Other other = new Other(this);
}
}
public class Other{
private Form1 frm1;
public Other(Form1 frm){
frm1 = frm;
}
public void WriteText(){
frm1.textOut.Text = "Howdy!";
}
}
In that code, you're giving Other a reference to the Form1 instance you're dealing with in its constructor, which is then being saved for future reference in a private field.
Charlie
if(!curlies){ return; }
|
|
|
|
|
Hello,
I have a tab control with five tabpages. On the fifth tabpage I placed some controls (text boxes) out of the tabpages client area. Now, from what I understand, with the autoscroll option on, if there are controls outside of the client area, a scrollbar will appear so that you can scroll and see them. However, when I check the tabpage, I can scroll down to the unseen controls but no scrollbar appears. I use the mouse wheel to go down but I would like the scroll bar to appear so that ppl know that there is more to be seen. Does anyone know why it is not being drawn?
Also, is there an option I can set so that text boxes can only accept integers or at least put up a message when the text box loses focus and the user put in some non-number chars, or do I have to validate that myself?
Thanx for the help,
-Flack
|
|
|
|
|
The TabPage won't display scroll bars, but the Panel will. Dock a Panel in your TabPage and add your controls to that instead (cutting and pasting controls works in VS.NET, but you'll have to re-hookup any event handlers).
For the second question, you can handle the TextChanged event and validate the characters one by one (using, perhaps, Char.IsDigit) - which will also validate (and optionally throw an exception) text when assigned programmatically, or for user input just handle the KeyDown event and validate the Keys enumeration passed with the KeyEventArgs.
Microsoft MVP, Visual C#
My Articles
|
|
|
|
|
Hi,
I am wondering if I create a diffgram dataset and I save the dataset to file and then want to commit the dataset to the database. I would assume that I would use a DataAdapter to help commit changes to db, correct?
Is there any special command in the DataAdapter in order to save dataset to database outside of the Update command? Like in the Update property is there any special option type that needs to be included in order to inform the DataAdapter what I am trying to accomplish?
Will a diffgram dataset work for Access as well as Sql Server?
Thanks,
JJ
|
|
|
|
|
MrJJKoolJ wrote:
Is there any special command in the DataAdapter in order to save dataset to database outside of the Update command?
I think you are talking about DataSet.GetChange() method. Also take a look at DataSet.Merge() , DataSet.Copy() too.
Mazy
"A useless but amusing fact is that if all the DNA in all the cells in a single human being were stretched out it would reach the moon and back eight thousand times." - Steve Jones
|
|
|
|
|
i want to create a live web radio station and i dont know where to start
pls help
cristiansje@yahoo.com
|
|
|
|
|
If you're familiar with programming you could investigate other sources (in different languages, like C++ and Delphi) if you can find any.
|
|
|
|
|
i didnt find any code for this  this why i asked about it
|
|
|
|
|
I know people who have had success using http://www.shoutcast.com/ but I dont know much about it myself.
Good luck.
|
|
|
|
|
i know about them but need some basic concepts
|
|
|
|
|
As a MFC programmer I got used to be able to specify an UpdateCommandUI command handler that would take care of enabling/disabling my toolbar buttons and menu items, setting checkmarks in front of menuitems, select correct push buttons in toolbars etc. Is there any mechanism similar to this in .NET? I haven't been able to figure it out, or do I have to hard code this behaviour into every single event handler that's relevant?
Wenn ist das Nunstück git und Slotermeyer? Ja! Beierhund das oder die Flipperwaldt gersput!
|
|
|
|
|
dabs wrote:
do I have to hard code this behaviour into every single event handler that's relevant?
Write seprate method which update controls and simply call it whenever you need updating.
Mazy
No sig. available now.
|
|
|
|
|
|
Uwe Keim wrote:
You missed the "call" word
Corrected now. 
Uwe Keim wrote:
but surely it is quite inefficient if you have large number of controls to update.
Yes, but I don't think any other way exists in C#.
Uwe Keim wrote:
I think MFC's version only call the apropriate handlers that are really needed (e.g. only the contents of ONE dropdown menu).
Its a long time that I haven't use MFC , but as muuch as I remeber it was not act like this too. 
Mazy
"A useless but amusing fact is that if all the DNA in all the cells in a single human being were stretched out it would reach the moon and back eight thousand times." - Steve Jones
|
|
|
|
|
Has anyone ran into this before? When I try to load a xfdf into the ocx the control stops responding. The reader.exe has full support for xfdf, so I have not idea what to think.
|
|
|
|
|
I have a small library witch contains a few controls and one simple class. The class holds a vew variables and functions that the controls need and also manipulates with the controls itself (changes their text and color for example).
MyOwnPropertiesClass <---- Ctrl1/2/3 connect to this class.
| | |
Ctrl1 Ctrl2 Ctrl3
Because all controls in library exchange information through that one class, there must be only one instance of that class. It should be created just when the library is initialized or something like that. How is it possible ?
Best regards, Desmond
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
