Re: Importing a DLL at runtime - C# Discussion Boards

Guffa5-Sep-05 2:37

5-Sep-05 2:37

Look at the Math.Round(double, digits) method, the Double.ToString(format) method, and the String.Format(format, ...) method.

Examples:

double n = 3.1415926536;
double d = Math.Round(n, 3);

string s = n.ToString("0.###");

string s = n.ToString("c2", new CultureInfo(1053))

int i = 42;
string s = String.Format("Code: {0:00000}.", i);

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b { font-weight: normal; }

Overlapping Images

dhanunjay5-Sep-05 1:49

dhanunjay

5-Sep-05 1:49

Hi
Please help me in Overlapping the images
I have taken two images in two pictureboxes, the images (.bmp) type Polygon shapes. If i place one image on another the backgroud image is not displaying. how can i see the two images at the same time.

dhanunjay

Image Resizing in a Picture box using c#

dhanunjay5-Sep-05 1:41

dhanunjay

5-Sep-05 1:41

I took an image in the piture box. i hav written the code for rotation using the Matrix. It is rotating. but if i stretch the image, image is not streching only picture box is stretching.Please help me to resize the image

Re: Image Resizing in a Picture box using c#

Martin#5-Sep-05 8:41

Martin#

5-Sep-05 8:41

Hello!

You can use the Property "SizeMode" in the PictureBox Class.
But you have to use the "Image" Property, not the "BackgroundImage".

_picturebox.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;

Good luck!

Martin

TIFF file with included color schema

yarns5-Sep-05 0:52

yarns

5-Sep-05 0:52

Hi,

how load to picturebox TIFF image with included color schema?

Greetings

Importing a DLL at runtime

totig4-Sep-05 23:09

totig

4-Sep-05 23:09

Hi, I have the situation where I need to create a wrapper for an unmanaged dll. My only problem is that all examples are shown with the dll specified before hand. I would like to specify the dll to use at runtime. If this is possible, please let me know. My reason for this is I have about 10 dll's which are would all have the same signatures, but are designed to access differenct machines.

So basically if I am not able to pass in the dll to use when needed, I am going to be stuck having 10 different classes all to do a similar thing. Thanks

Re: Importing a DLL at runtime

totig4-Sep-05 23:52

totig

4-Sep-05 23:52

Hi, just to add a bit more to this, the following code would work fine, except that I have to mark dllLocation as const. If I change it, it does not work, and this is exactly what I need. So any help would be appreciated.

const string dllLocation = "test.dll";

[DllImportAttribute(dllLocation)]
public static extern void SetServerName (string pServerName);

Re: Importing a DLL at runtime

mav.northwind5-Sep-05 2:17

mav.northwind

5-Sep-05 2:17

Hi!

At least the name of the DLL has to be constant, if you use this approach.
If the path of the dll is unknown at compile time, then you can still change the current directory to the DLL's path at runtime and then use the DLL function, this will work.

Regards,
mav

Re: Importing a DLL at runtime

totig5-Sep-05 2:25

totig

5-Sep-05 2:25

Hi, its never known at runtime what the path will be. You mentioned though 'using this approach'. Could you let me know some other approaches I could use if this one does not help me?

Re: Importing a DLL at runtime

mav.northwind5-Sep-05 10:26

mav.northwind

5-Sep-05 10:26

If everything else fails you can P/invoke LoadLibrary and then try to call the functions in the DLL somehow. I think I saw an article here somewhere doing just this, but I could be wrong.

Good luck,
mav

Re: Importing a DLL at runtime

Luis Alonso Ramos5-Sep-05 7:26

Luis Alonso Ramos

5-Sep-05 7:26

I don't think it's possible to do it dynamically using .NET.

What you could do is make an unmanaged DLL that works as a stub, which is always the same. Then you link to that stub DLL from your .NET code. That DLL determines the path of the DLL to load, and uses LoadLibrary and GetProcAddress to link to it.

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

The amount of sleep the average person needs is five more minutes. -- Vikram A Punathambekar, Aug. 11, 2005

How to find inner length (number of cols) in a rectangular array?

signbit4-Sep-05 22:46

signbit

4-Sep-05 22:46

I have an array declared like this:

byte[,] grayPixels = new byte[rows, cols];

later in the code, (where I don't have access to rows or cols), I have to iterate through grayPixels, I am using the following code to find the number of rows

int nRows = grayPixels.Length;
// int nCols = ?

How can I find out the number of columns in the above array? Thanks in advance...

- A programmer's national anthem; "AAAAAHHHHH!!!!"

Re: How to find inner length (number of cols) in a rectangular array?

Guffa4-Sep-05 22:53

Guffa

4-Sep-05 22:53

Use grayPixels.GetLength(0) to get the size of the first dimension, and grayPixels.GetLength(1) to get the size of the second dimension.

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b { font-weight: normal; }

Re: How to find inner length (number of cols) in a rectangular array?

Andrew Kirillov4-Sep-05 22:56

Andrew Kirillov

4-Sep-05 22:56

Hello

int nRows = grayPixels.GetLength(0);
int nCols = grayPixels.GetLength(1);

Andrew

Re: How to find inner length (number of cols) in a rectangular array?

signbit4-Sep-05 23:00

signbit

4-Sep-05 23:00

Thank you very much...

- A programmer's national anthem; "AAAAAHHHHH!!!!"

Crystal Report

| Muhammad Waqas Butt |4-Sep-05 22:27

| Muhammad Waqas Butt |

4-Sep-05 22:27

Problems:

(1) How to get dynamic “Crystal Report” data I mean I have 3 tables named as Job, JobDesc and Emp_Info’ there is a primary key name JobNo now I want that I pass sqldb command at run time and in where clause I pass the JobNo so then on the crystal report only data show which have given JobNo.
(2) How to set Multi-line Report in Crystal Report Detail Section. Like this:
(3) How to display custom date format (Sep-06-2005) in Crystal Report.

Job No Title Employee Id
_____________________________________________________
1 Dummy Dummy Title Dummy Title 001
2 Dummy Title Dummy Title Dummy 002
sdfshdkfsdhkfshdkhs
3 Dummy Title Dummy Title Title 003
_______________________________________________________
I mean which property I have to change in order to get this kind of look.

Sample code can be fine at:
http://sktech.freewebspace.com/My%20Problems/[^]

Yours sincerely,

|Muhamad Waqas Butt|
waqasb4all@yahoo.com
www.sktech.freewebspace.com

-- modified at 4:30 Monday 5th September, 2005

Multi Line TextBox for Addresses

Greeky4-Sep-05 22:19

Greeky

4-Sep-05 22:19

I have a Multi Line Textbox. User will input address information.I wantta set cursor to new line, when user press enter key. I try following code to achive but it always set cursor to first line. what do u offer me :S

protected sub txtAddress_KeyUp(........) handles txtaddress.keyup
if (e.key= keys.enter){
txtaddress.text &= envoirenment.newline;
}
end sub

Re: Multi Line TextBox for Addresses

philip_cole4-Sep-05 23:21

philip_cole

4-Sep-05 23:21

Hi Greeky,

Well the easy way is to set the AcceptsReturn property of the textbox to true. That should let them press enter onto new lines.
If you want to do it manually, just change the code to the following (converted to c# from interesting vb hybrid)

<br />
protected void txtAddress_KeyUp(........) {<br />
  if(e.key == keys.enter)<br />
  {<br />
    txtaddress.Text += environment.newline;<br />
    txtaddress.SelectionStart = txtaddress.Text.Length-1;<br />
    txtaddress.SelectionLength = 0;<br />
  }<br />
}<br />
/* NB. This may not be quite right, as my VS is ill, so didnt test it */<br />

The two lines to note are setting SelectionStart and SelectionLength. This just says move the cursor to the last character, and make sure no text is selected.

Hope this helps
Philip Big Grin | :-D

Re: Multi Line TextBox for Addresses

Greeky4-Sep-05 23:26

Greeky

4-Sep-05 23:26

uehueh Thank you Big Grin | :-D

AcceptReturns is Ok.

sometimes im stupid, why havent i checked all properties before ? Mad | :mad:

Thank you again

[Message Deleted]

bruno cortona4-Sep-05 22:14

bruno cortona

4-Sep-05 22:14

[Message Deleted]

Re: VS .NET 2003 hangs on NullReferenceException

Andy Brummer5-Sep-05 4:22

Andy Brummer

5-Sep-05 4:22

I've found that running
del %temp%\*.*

periodically helps vs.net performance out alot.

I can imagine the sinking feeling one would have after ordering my book,
only to find a laughably ridiculous theory with demented logic once the book arrives - Mark McCutcheon

Re: VS .NET 2003 hangs on NullReferenceException

bruno cortona5-Sep-05 5:22

bruno cortona

5-Sep-05 5:22

very true, but it didn't help...

unsafe code

Sheel Gohe4-Sep-05 22:00

Sheel Gohe

4-Sep-05 22:00

Friends,
How can i successfully compile a low level code in C#.

Thanks in advance.

Sheel Gohe

C# DLL in VC++ / MFC

Anonymous4-Sep-05 21:40

Anonymous

4-Sep-05 21:40

If I write a DLL assembly in C# using .NET, can I use it in my VC++ / MFC projects? My question is can such C# DLL be used in C++ type projects WITHOUT first converting the DLL in a COM ?

Thanks

Re: C# DLL in VC++ / MFC

Anonymous5-Sep-05 2:24

Anonymous

5-Sep-05 2:24

Just set your C# project to Register For COM Interop in Project Properties.

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.