Online Game - Communication Method? - C# Discussion Boards

1-Jan-03 10:20

Does anyone know how to get the icon from a specified executable path? I know there is an Icon class and the Graphics class has a DrawIcon function, however I am not sure how they work together. Note that the icons will be coming from other applications, not necessarily from another C# application.

Nick Parker

You see the Standards change. - Fellow co-worker

Stephane Rodriguez.1-Jan-03 10:31

1-Jan-03 10:31

Nick Parker wrote:
Does anyone know how to get the icon from a specified executable path?

// System.Drawing.Icon constructor
public System.Drawing.Icon(
Type type,
string resource
);

(that's the equivalent of WIN32's LoadLibrary(path) + LoadResource(iconid))

doc here[^].

Nick Parker1-Jan-03 10:43

1-Jan-03 10:43

S.Rod, thanks, I had actually looked at this a few of the other 6 different constructors for the Icon class, however I wasn't/and am still not sure for exampple with your suggestion what to use as the Type and resource, where do they come from?

This below can't be right...

Icon i = new Icon(typeof(".exe"), ?);

Icon i = new Icon(Type.GetType(@"C:\Windows\System32\notepad.exe"),?);

I think I am shooting blanks here, thank you.

Nick Parker

You see the Standards change. - Fellow co-worker

Stephane Rodriguez.1-Jan-03 19:05

1-Jan-03 19:05

The type is internally passed to that documented method : type.Module.Assembly.GetManifestResourceStream(type, resource);

After checking out that call, I have seen it's currently not implemented in .NET 1.0. It always throws an exception.
If someone has .NET Everett installed, may be he can shed us a light on whether it's now implemented.
Otherwise, I am afraid you'll have to rely on P/Invoke : LoadLibrary() + LoadImage().

Once you have your icon handle, you just need to pass it to the System.Drawing.Icon(IntPtr handle) constructor.

In addition

Nick Parker2-Jan-03 5:51

2-Jan-03 5:51

.S.Rod. wrote:
Otherwise, I am afraid you'll have to rely on P/Invoke : LoadLibrary() + LoadImage().

Ok, I feel like the smoke is starting to clear now, thank you. After looking up a few of the functions on MSDN I came up with the following:

[DllImport("kernel32.dll",CharSet=CharSet.Auto)]
static public extern IntPtr LoadLibrary(string lpFileName);

[DllImport("user32.dll",CharSet=CharSet.Auto)]
static public extern IntPtr LoadImage(IntPtr hinst,
                  string lpszName,
                  uint uType,
                  int cxDesired,
                  int cyDesired,
                  uint fuLoad);

And then I implement it like this:

Graphics grfx = Graphics.FromHwnd(this.Handle);
Rectangle rect = new Rectangle();
rect.X = 0;
rect.Y = 0;
rect.Width = 16;
rect.Height = 16;
     IntPtr i  = API.API.LoadLibrary(app1);
IntPtr i2 = API.API.LoadImage(i, app1, 1, 0, 0, 0x0010);
Icon ico = System.Drawing.Icon.FromHandle(i2);
grfx.DrawIcon(ico, rect);

I have noticed when I step through it that LoadImage returns 0 for i2 and then when I try to create the ico Icon it throws a System.ArgumentException saying the Win32 handle I passed to Icon is invalid or the wrong type. Any ideas?

Nick Parker

You see the Standards change. - Fellow co-worker

Stephane Rodriguez.2-Jan-03 10:05

2-Jan-03 10:05

A few points :
- If LoadImage returns 0, that's because it has failed. There is no point in passing 0 as a handle in the FromHandle() method.
- To know more about the error, you can use the GetLastError() WIN32 function.
- LoadImage can be used in either of the following ways. Trouble is you are using a mix of it! Namely,
-- If LR_LOADFROMFILE is provided as last parameter value (0x0010), like you do, then the second parameter is the actual filename of the image. Doing so, you are directly loading a .bmp, .ico, .cur file. But, from what you told me first you wanted to do, you should not use LR_LOADFROMFILE.
-- If LR_LOADFROMFILE is not provided, then the first paramter is the module instance of the .dll or .exe, allright, and then the second parameter is the resource name. You must pass the resource name : that is either the translated resource ID (use a resource editor) obtained with MAKEINTRESOURCE, or the direct resource name as a string.

MAKEINTRESOURCE is an int --> LPSTR macro defined as is :
#define MAKEINTRESOURCE(i) (LPSTR)((DWORD)((WORD)(i)))

Nick Parker2-Jan-03 11:43

2-Jan-03 11:43

.S.Rod. wrote:
MAKEINTRESOURCE is an int --> LPSTR macro defined as is :
#define MAKEINTRESOURCE(i) (LPSTR)((DWORD)((WORD)(i)))

Unsure | :~

I have no idea how to convert that to a C# statement (I think I am lost again):

int MAKEINTRESOURCE(i)
{
return Convert.ToString(Convert.ToDouble(i)));
}

.S.Rod. wrote:
If LR_LOADFROMFILE is not provided, then the first paramter is the module instance of the .dll or .exe

That is what I am doing, correct?

.S.Rod. wrote:
You must pass the resource name : that is either the translated resource ID (use a resource editor) obtained with MAKEINTRESOURCE, or the direct resource name as a string.

I see, I think, so I need to switch the 2nd param to a resource ID huh? I will check into that. Tell me something, am I making something simple, hard? I know a little about Win32, I just havn't worked with it a lot, VB shop at work. Eek! | :eek:

Thanks S.Rod. I appreciate it.

Nick Parker

You see the Standards change. - Fellow co-worker

Stephane Rodriguez.2-Jan-03 18:58

mySQL, what do you think?

2-Jan-03 18:58

Nick Parker wrote:
That is what I am doing, correct?

Unfortunately no. 0x0010 = LR_LOADFROMFILE, thus wrt this you should be passing a filename pointing to an actual .bmp, .cur or .ico file. Which you don't, since you are passing a .dll/.exe filename instead.

Nick Parker wrote:
I need to switch the 2nd param to a resource ID huh?

We are not talking about ConvertToString, which is the equivalent of VB's STR$().
MAKEINTRESOURCE makes an int looks like a pointer to a string. That's obtained by casting an int to an IntPtr.

At this point, you shouldn't bother that much about all this. Just lookup Cp, MSDDEV samples, and Google with either of those keywords : LoadIcon, LoadImage.

Jassim Rahma1-Jan-03 3:59

Jassim Rahma

1-Jan-03 3:59

Can some tell me about his experience using mySQL with .NET? what are the advantages and disadvantages? any limitations or restrications?

I want to build a corporate application which will have a network access as well as remote access and I'm planning to use mySQL because of the limitation inb MS Access and SQL server with MSDE.

Many Thanks,
Jassim Rahma

Jassim Rahma

David Stone1-Jan-03 6:14

David Stone

1-Jan-03 6:14

You should really only post things in one forum. Pick the one suited to your post the most and then stick with it.

However, I will tell you that dealing with mySQL in general is a pain for any form of Windows development. The myODBC driver that comes along with it is such a bother to configure. If you already have it, I'd stick with SQL Server. If not, I'd go with MSDE (a scaled down version of SQL Server).

I don't know whether it's just the light but I swear the database server gives me dirty looks everytime I wander past.
-Chris Maunder

Microsoft has reinvented the wheel, this time they made it round.
-Peterchen on VS.NET

Adrian Hall2-Jan-03 10:43

Adrian Hall

2-Jan-03 10:43

Disclaimer: Although I use MySQL, I have not used MySQL with C#

That being said, MySQL does have an ODBC driver at www.mysql.com and there is a supported version (via MySQL AB) although you will have to ask for a quote, since in a corporate edition, this can get quite pricy.

... and my experience with C# and ODBC is quite good.

Regards,

Adrian

Jassim Rahma3-Jan-03 0:36

Jassim Rahma

3-Jan-03 0:36

then, do you recommend mySQL for corporate application, or let me ask it the other way: which database you recommend for corporate if not MS Access and MS SQL server?

Jassim