C# Discussion Boards - CodeProject

Nick Parker22-Nov-04 3:56

22-Nov-04 3:56

mav.northwind wrote:
but what about the AxInterop.* ?

Mav, the AxInterop assembly that is created literally wraps the ActiveX control to expose it as a Windows Forms control, it's base class is AxHost. You typically wouldn't want to create this manually, however you can use the Aximp.exe[^] (Windows Forms ActiveX Control Importer) to generate this assembly yourself.

- Nick Parker
My Blog | My Articles

Re: How are AxInterop-DLLs created?

mav.northwind22-Nov-04 21:51

mav.northwind

22-Nov-04 21:51

Thanks alot, Nick!

I was asking because I have to support two different versions of a third party program exposing ActiveX controls and COM objects in my program.
The problem is that the interfaces of these objects have changed but have kept the same name. So I couldn't find a way to instantiate a class implementing a specific interface version and am now trying to use 2 RCW dlls with different namespaces.

Don't know if this will work, though.

The core problem is: I can't have both versions of the application installed at the same time, so I must build against the version currently installed. When I build against the newer version, I'll get class not registered-errors when instantiating objects with the older version installed. The other way round I can't use any features from the newer version.

You don't have an idea how to do this by chance?

Thanks,

Mav

DevPartner and WaitForSingleObject

PaleyX21-Nov-04 23:57

PaleyX

21-Nov-04 23:57

I am doing some code profiling on my project to try and identify any speed bottlenecks - I am using DevPartner community edition from Compuware - when I run the tests my project spends about 90% in WaitForSingleObject, Sleep and SleepEx - why would it do that? The program isn't multithreaded and the main part of the program I am testing has no user interraction - it's basically some IO and a lot of bit shifting.

TIA

Re: DevPartner and WaitForSingleObject

Daniel Turini22-Nov-04 1:03

Daniel Turini

22-Nov-04 1:03

PaleyX wrote:
it's basically some IO
You have to wait for the I/O finish. Often this is done by the CLR using WaitForSingleObject, because some I/O classes only implement asynchronous interfaces (Begin*/End*) - the synchronous versions of these methods simply call the Begin/End pair.
What you're seeing is that your program is spending 90% of the time blocked by I/O. Maybe multithreading would help you a bit.

Yes, even I am blogging now!

Re: DevPartner and WaitForSingleObject

PaleyX22-Nov-04 1:53

PaleyX

22-Nov-04 1:53

Thanks for that. It isn't really a problem as the program is fast enough - analyse 1 billion records per second anybody? I was just curious why it was spending so much time sleeping and waiting.

Rugby League: The Greatest Game Of All.

How to find CRC32 value of a File?

pubududilena21-Nov-04 22:27

pubududilena

21-Nov-04 22:27

hi all,
I want to find CRC32 value of any kind of file(*txt,*.jpg,etc....) using C#..
Can u please help me how to find that value?

Thanks in advance..

implementation of "show me as idle for x mins"

Kamran Zafar21-Nov-04 20:06

Kamran Zafar

21-Nov-04 20:06

Hi,

Does anybody has any idea how to give implementation in c-sharp, of the following feature of Yahoo or MSN:

Show me as "Away" when I am inactive for 10 minutes.

I have a chat client application developed in c-sharp. And now I want to give the same feature in my app too.

Prompt reply will be appreciated.

Regards,
Kamran

Re: implementation of "show me as idle for x mins"

Stefan Troschuetz21-Nov-04 21:29

Stefan Troschuetz

21-Nov-04 21:29

You could take a timestamp everytime the user of your application does something and store it somewhere. This timestamp value then gets compared with the actual time inside of an timer event handler and if the difference is greater than 10 min you set the status to "Away".

www.troschuetz.de

Re: implementation of "show me as idle for x mins"

benjymous21-Nov-04 22:16

benjymous

21-Nov-04 22:16

Simple solution - have a timer that ticks every so often (depending on how accurate you want your away timer to be)

Every time the timer ticks, increment the counter, when the counter goes above a pre-set value (i.e. how ever many timer ticks there are in 10 minutes) you can set your status to away.

Now, in any of your mouse/keyboard handlers, just reset that counter to zero if you've got user input

--
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Re: implementation of "show me as idle for x mins"

Kamran Zafar21-Nov-04 22:30

Kamran Zafar

21-Nov-04 22:30

Hi Benjymouse,

Thanks for your prompt reply. It helps me a lot to understand the solution.

But how to capture mouse/keyboard events of windows. Remember my chat application application needs to be notified of any activity on windows for example if my chat application is minimized, and a user only moves his mouse on the desktop, my application should be able to capture this event.

I hope you understand what i mean.

Regards,
Kamran
dearkami@yahoo.com

Re: implementation of "show me as idle for x mins"

benjymous22-Nov-04 0:06

benjymous

22-Nov-04 0:06

Yes, of course. Sorry - I didn't think that far.

You'll need keyboard and mouse hooks, that'll let you monitor what's going on outside your application

There's a few articles on how to do this here on Codeproject:

Processing Global Mouse and Keyboard Hooks in C#[^]
Global System Hooks in .NET[^]
Using Hooks from C#[^]

One of those should be able to get you going!

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Help me! I'm turning into a grapefruit!
Phoenix Paint - back from DPaint's ashes!

Re: implementation of "show me as idle for x mins"

Kamran Zafar22-Nov-04 18:39

Kamran Zafar

22-Nov-04 18:39

Thanks a lot Benjymous,

I hope this will help me to resolve my problem.

Thanks again!
Best regards,
Kamran

Draw shape inside a control

sreejith ss nair21-Nov-04 19:45

sreejith ss nair

21-Nov-04 19:45

hi there,

How can draw shapes inside a control( a custom label control). The real idea behind this is, partitioning status through this control. Otherwise how can i partition a label control with different region. Blush | :O

Sreejith Nair
[ My Articles ]

Re: Draw shape inside a control

DougW4821-Nov-04 20:32

DougW48

21-Nov-04 20:32

overload the paint method of the control with what you want it to show...

Re: Draw shape inside a control

sreejith ss nair21-Nov-04 21:32

sreejith ss nair

21-Nov-04 21:32

I tried but failed. Reason is i need to split the entire size of controls into three different region and then need to get a block from that. This block need re design at run time based on user request(re design means - > assign back color,fore color,outer line color and highlight color etc). Some time user may merge any two block of region into one or the entire three block into one. So i am in trouble. Any idea ? Cry | :((

Sreejith Nair
[ My Articles ]

Datagrid ???

npqk21-Nov-04 19:07

npqk

21-Nov-04 19:07

I load my data into Datagrid, I'd like open a new form(contain the data about this row) by clicking on each row of the Datagrid . How can i do that ???

Re: Datagrid ???

sreejith ss nair21-Nov-04 19:50

sreejith ss nair

21-Nov-04 19:50

Use HiteTestInfo class which contains information about a part of the System.Windows.Forms.DataGrid at a specified coordinate. See MSDN for more details.
Eg:

<br />
System.Drawing.Point pt = this.dgUnAllocatedOrders.PointToClient(Cursor.Position); <br />
DataGrid.HitTestInfo hti = this.dgUnAllocatedOrders.HitTest(pt); <br />
if(hti.Type == DataGrid.HitTestType.RowHeader) <br />
{ <br />
Yourform alloc=new Yourform();<br />
alloc.ShowDialog();<br />
}

Sreejith Nair
[ My Articles ]

Font Height in twips?

sachinkalse21-Nov-04 17:14

sachinkalse

21-Nov-04 17:14

Hi If we check Font.Height property it returns the value in pixel. How to convert the same in Twips?
please guide

Re: Font Height in twips?

Nick Parker21-Nov-04 18:55

Nick Parker

21-Nov-04 18:55

Try the following:

[DllImport("gdi32.dll")]
static extern int GetDeviceCaps(IntPtr hdc, int nIndex);

int WU_LOGPIXELSX = 88;
int WU_LOGPIXELSY = 90;
int TwipsPerInch  = 1440;

private int PixelsToTwips(int pixels, bool bIsHorizonal)
{
    int twips;
    Graphics g = Graphics.FromHwnd(IntPtr.Zero);
    IntPtr hdc = g.GetHdc();
    int pixelsPerInch;
    if(bIsHorizonal)
        pixelsPerInch = GetDeviceCaps(hdc, WU_LOGPIXELSX);
    else
        pixelsPerInch = GetDeviceCaps(hdc, WU_LOGPIXELSY);
    g.ReleaseHdc(hdc);
    double numInches = pixels/pixelsPerInch;
    twips = (int)(numInches * TwipsPerInch);
    return twips;
}

- Nick Parker
My Blog | My Articles

Re: Font Height in twips?

sachinkalse23-Nov-04 21:48

sachinkalse

23-Nov-04 21:48

Thanks for the valuable input....
extending the same thread;
if the Unit of the given font is Graphics.World, how to convert the font height in to twips?

please guide

Resources in a Server application

Jack Hui21-Nov-04 16:05

Jack Hui

21-Nov-04 16:05

I've a server application, which will return some strings for different users. The users can set their locale to the server, so the return string is will be in the language they specified.

In my scenario, i coudln't use CultureInfo.CurrentCulture as my server has to serve differnt locales. Is it the only resort I've to use is creating different resources file, and load it up with differnt ResourceManagers, and get the string myself. Can I built them into 1 assembly and loading with 1 ResourceManager only ? As I heard that ResourceManager is quite resource consuming.

Hiya, Everybody ^^

Custom cursor + Imagelist

DennisMetz21-Nov-04 13:14

DennisMetz

21-Nov-04 13:14

Hi,

I want to implement several custom cursors in my application. Is it possible to load the cursors from an imagelist or do I have to put them as a ressource in my application and load them this way?

Thanks,
Dennis

Interesting DB issue

StephenMcAllister21-Nov-04 9:27

StephenMcAllister

21-Nov-04 9:27

Hi,

I have written a SQL database application which works great. The client has a remote pc (off site - which has its own database) and a remote laptop (on-site - which has its own database) so the employee can work if the power goes out. What I want to set up is a way to extract changes made to the database into packets and FTP to the offsite pc and read in those changes. I want to achieve a simular result but over the network, not through FTP.

Is there a way to extract changes from an SQL database of all transactions so i can send this information to the offsite and onsite pc?

OR

Is there any way to achieve this????

I am open to realistic suggestions or products.

Thanks

Stephen

Re: Interesting DB issue

sreejith ss nair21-Nov-04 17:02

sreejith ss nair

21-Nov-04 17:02

Replication will help you out. But i am not sure about how to configure Replication in SQL Server.

Sreejith Nair
[ My Articles ]

Launching C# Applications in IE

mkushner21-Nov-04 5:27

mkushner

21-Nov-04 5:27

Does anyone have any good tutorials about developing Web Browser Addins. I've found this article http://www.csharp-station.com/Tutorials/Lesson01.aspx[^] but it requires a lot of configuration on the client as seen here... http://www.csharp-station.com/Tutorials/SmartConsoleSetup.aspx[^]

What I want to know is, what is the .NET way of launching C# applications like we did with the <OBJECT> tags before .NET was around?

Any help would be greatly appreciated.

Thanks in advance.
Mike Kushner
mike@kushners.com

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