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Hi all,
Is there a way for a process running to know if a specific IPC channel or object type has been IPC - registered (registered well known service type) by a server process running in the same machine ?
Thanks a lot,
Juan
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Hello.
I've have this little method (yes - I know it makes no sense - but it is a test):
<br />
public void AddNumbers()<br />
{<br />
Int16 a = 2;<br />
Int16 b = 4;<br />
Int16 c = 6;<br />
<br />
Int16 result = a + b + c;<br />
}<br />
The above will not compile. I get the CS0266 compiler error: Cannot implicitly convert type 'int' to 'short'. An explicit conversion exists (are you missing a cast?)
But this will:
<br />
public void AddNumbers()<br />
{<br />
Int16 a = 2;<br />
Int16 b = 4;<br />
Int16 c = 6;<br />
<br />
Int32 result = a + b + c;<br />
}<br />
Now why is this happening? I've checked the IL code for the method, it looks like this:
<br />
.method public hidebysig instance void AddNumbers() cil managed<br />
{<br />
.maxstack 2<br />
.locals init ([0] int16 a,<br />
[1] int16 b,<br />
[2] int16 c,<br />
[3] int32 result)<br />
IL_0000: nop<br />
IL_0001: ldc.i4.2<br />
IL_0002: stloc.0<br />
IL_0003: ldc.i4.4<br />
IL_0004: stloc.1<br />
IL_0005: ldc.i4.6<br />
IL_0006: stloc.2<br />
IL_0007: ldloc.0<br />
IL_0008: ldloc.1<br />
IL_0009: add<br />
IL_000a: ldloc.2<br />
IL_000b: add<br />
IL_000c: stloc.3<br />
IL_000d: ret<br />
}
As far as I can see IL adds the numbers as ldc.i4. is this integer 4 byte? Because if it is, why does it not get the numbers from ldc.i2. instead? Since my variables are of the type Int16?
Can anybody tell me why?
Best regards
Soeren
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Bad Robot wrote: As far as I can see IL adds the numbers as ldc.i4. is this integer 4 byte? Because if it is, why does it not get the numbers from ldc.i2. instead? Since my variables are of the type Int16?
Can anybody tell me why?
That is what is happening. It's needed because adding two int16's could overflow and require an Int32 to store the result. Forcing an explicit cast is intended to make the developer aware of the failcase at design time rather than having a user discover it via a runtime exception.
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dan neely wrote: That is what is happening. It's needed because adding two int16's could overflow and require an Int32 to store the result.
This is obviously not the case here, see my post below. Using the unchecked keyword also fails.
regards
modified 12-Sep-18 21:01pm.
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This is strange indeed. The compiler also complains when using the unchecked keyword.
I googled a bit and found out that ldc only supports i4, i8, r4 and r8 as parameters (i=int, r=float), which would mean that Int16 are internally interpreted as Int32, can anyone confirm this?
The "ldc" instruction can support a 4-byte integer (i4), an 8-byte integer (i8), a 4-byte float (r4) or an 8-byte float (r8).
-> source
regards
modified 12-Sep-18 21:01pm.
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That makes sense considering processor registers, supported by the .NET Framework, are either 32 or 64 bits wide.
According to the documentation for the LDC_I4[^] and LDC_I8[^] opcodes, yes, this is the case. Integers of any size are stored in either 4 or 8 bytes.
Dave Kreskowiak
Microsoft MVP - Visual Basic
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shorts are promoted - converted - to ints before performing calculations. This is true in C and C++ as well as in C#. Therefore the type of 'a + b' is Int32. When you then try to assign the result of the expression (which is Int32) back to an Int16, there's a type mismatch, which produces the error message.
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I have this code:
Stream s = File.Open(@destinationDirectory + tableName + ".cs", FileMode.Create);
StreamWriter sw = new StreamWriter(s);
CodeGeneratorOptions cop = new CodeGeneratorOptions();
CodeNamespace cdm = new CodeNamespace(nameSpace);
CSharpCodeProvider cscProvider = new CSharpCodeProvider();
ICodeGenerator cscg = cscProvider.CreateGenerator(sw);
CodeTypeDeclaration ctd = new CodeTypeDeclaration(tableName);
ctd.IsClass = true;
ctd.TypeAttributes = System.Reflection.TypeAttributes.Public;
This works just fine for creating the class.
But, I want to declare this a partial class for this reason. I have a main code file with methods and what not. But, I am creating the properties for the class dynamically. So I want this class to be a partial class file that is never opened and can be replaced any time.
So I need to say "public partial class". Does anyone know how?
Thanks,
Nick
--------------------------------------------------------
1 line of code equals many bugs. So don't write any!!
My mad coder blog
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nevermind, its a boolean property in the code type declaration
--------------------------------------------------------
1 line of code equals many bugs. So don't write any!!
My mad coder blog
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Happens to me all the time: ask a question to which I didn't bother enough/was too deep thinking to quickly find the answer myself.
Best regards... 
Vini - Csharpian
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Hello,
I have been trying to modify the available .NET WMI examples on The Code Project so that I could uniquely identify a pen-drive (usb key). Unlike the hard disks, pen drives do not expose a property like UniqueID. Any ideas of what I could use to uniquely identify it?
I have already read and tried the "normal" examples available on .NET's WMI.
Thank you all in advance,
Vini - CSharping a lot
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Hi!
I think Win32_DiskDrive.PNPDeviceID is unique. I tried it with two idential usb sticks and they gave different PNPDeviceID's.
Regards,
mav
--
Black holes are the places where god divided by 0...
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mav.northwind wrote: Hi!
I think Win32_DiskDrive.PNPDeviceID is unique. I tried it with two idential usb sticks and they gave different PNPDeviceID's.
Hi Mav... Tried that but unfortunately I think I couldn't use that, as windows gives your pen-drive a different PNPDeviceID each time you plug it in. =) I needed something that could tell "Oh, this is Jimmy's pen-drive" for instance. I am developing an app in which, along with user and password, the client system has to provide an unique ID for the pen-drive being used with the app. Any other ideas?
Regards...
Vini
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You might be able to gleen something useful from this[^].
Dave Kreskowiak
Microsoft MVP - Visual Basic
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ReHi!
At least with the 4 sticks (3 different brands) I tried it with, they all kept their PNPDeviceID, even when I plugged them into another computer.
But your mileage may vary...
Regards,
mav
--
Black holes are the places where god divided by 0...
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mav.northwind wrote: At least with the 4 sticks (3 different brands) I tried it with, they all kept their PNPDeviceID, even when I plugged them into another computer.
But your mileage may vary...
You're quite right, mav... Looking through msinfo32.exe I could check that it remains the same, actually. I also tested on another workstation.
Thanks a lot for your help.
And btw: the link that Dave (if Im not wrong) posted is very nice. If you wanna take a peek:
http://msdn.microsoft.com/coding4fun/someassemblyrequired/isthatyou/default.aspx
Cheers,
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Marcos Accioly wrote: And btw: the link that Dave (if Im not wrong) posted is very nice. If you wanna take a peek:
http://msdn.microsoft.com/coding4fun/someassemblyrequired/isthatyou/default.aspx
Yup, I already browsed through it. Very nice, indeed. 
Regards,
mav
--
Black holes are the places where god divided by 0...
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Hi again mav,
I actually tried the PNPDeviceID for my LG UP3D USB Device and it simply informed nothing. *But* going to msinfo32.exe gives me the following output:
LG UP3D USB Device USBSTOR\DISK&VEN_LG_UP3D&PROD_&REV_\200508010001&0
USB Mass Storage Device USB\VID_043E&PID_7090\200508010001
which tells me that windows actually has a PNPDeviceId for it, that being VID_043E&PID_7090 (according to the article at Coding4Fun about the wireless usb PC Lock).
Now the question is: Why?
you can check out a printscreen I've done of the simple app for identifying the hardware HERE
Cheers,
Vini
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The wonders of windows...
I'm afraid I don't have the faintest idea why 
Regards,
mav
--
Black holes are the places where god divided by 0...
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hi there,
I have the following MATLAB function:
function y=drwmesh(FNo,V1,V2,T)
figure(FNo)
x=[-10:2.5:60]; y=[-20:2.5:35];
[sx sy]=MESHGRID(-10:60,-20:35);
h=STREAMLINE(V1',V2',sx,sy);
set(h,'color','red'); view(2);
xlabel('Longitude'); ylabel('Latitude');
title(T);
y=0;
I have converted it to (.dll) file by using MATLAB Builder for COM.
My problem is that I don't know how to pass the parameters: FNo(Figure No.) which is integer and the two matrices V1,V2 and the string T.
Woudl u plz write me the C# code? plz help me!!
Note: I'm using "Extreme Optimization Mathematics Library for .NET" to creat and perform matrix operatins.
Thanks in advance,
Jr.Allam
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Hi,
If i send a comman to a device which is attached to my serial port.
How can i save the response i get?
Thanks in advance!
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Yustme wrote: How can i save the response i get?
Create a file and write the data to the file 
led mike
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You have to register an event in the serialport class like this
SPort.DataReceived += new SerialDataReceivedEventHandler(SPort_DataReceived);
In the eventhandler you can read the data in the buffer by char or by the whole string using the following methods
ReadChar()
ReadExisting();
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Hello,
Just i want to ask you that can we set system's default sound device through
programmitically.
I just explore my questions as, I have two sound cards connected to my pc.
One is my inbuilt and i have connected anothor USB sound card to PC.
Now, the inbuild sound card in my default sound card and i want to make second one
i.e. i want to make USB sound card as default when my application starts and when application is
shutting down i want to make it as default.
Thanks in advance.
Rahul Kulkarni.
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Hello
you should be looking Here[^]
Regards ![Rose | [Rose]](https://www.codeproject.com/script/Forums/Images/rose.gif)
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