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bob16972 wrote: If the caller violates the standard definition of a reference, there is nothing I can do about it. I'm not even sure there is a way to check the reference for validity since the result of the action you described would be undefined (or at least, so it seems).
Exactly, with no need to further qualify the statement as you did in the second sentence. And no, there is no way to check a reference for validity, since it must be valid by definition. Otherwise, the caller has violated (a) the language specification of a valid C++ program and (b) the contract you have specified by defining the method signature that way... That's what I wrote in my post above (which was down-voted for some reason).
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Jeez. You missed the whole point of what I'm trying to do. You keep focusing on C++ references and pointers whereas I have no problem with C++ since I can choose to use pointers when I want to allow null and a reference when I don't. In C# sharp, I don't seem to have that option (except for ref apparently which would require a const to (attempt to) protect the caller from the method changing the reference on them.
From reading your earlier post, you apparently didn't read the code comments in my code examples as I had already stated that a reference can't be null but you tried to explain that very thing to me which would indicate you missed the point and the question.
Regardless, I appreciate your attempt to help find a solution, for what it's worth.
thanks.
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Hello, I have a winform project in C# which I added a reference to windows media player.
when Im in the project properties I get the error:
An error occurred trying to load the page.
Error HRESULT E_FAIL has been returned from a call to a COM component.
Why is that?
The project is working fine including the player.
--Edit--
I found this error also but I didn't understand its meaning:
COM Reference 'WMPLib' is the interop assembly for ActiveX control 'AxWMPLib' but was marked to be linked by the compiler with the /link flag. This COM reference will be treated as a reference and will not be linked.
modified on Friday, January 14, 2011 2:30 PM
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Hi,
Our solution in .net 3.5 has a number of dll's as output. In those dll's we populate some fields like version, company, product etc. But also a copyright notice. For instance, if I have this notice: "Copyright (c) 2011 Initech Inc.".
Is it possible to make the year value be determined at compile time? So, if I compile it in 2011, then it says "Copyright (c) 2011 Initech Inc.". If I compile it in 2012, it would say "Copyright (c) 2012 Initech Inc.".
I've toyed with some things, but AssemblyCopyright requires a constant as value.
Is it possible at all?
The consumer isn't a moron; she is your wife.
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This always works for me 
Hope it helps.
StreamReader reader = new StreamReader(@"C:\FilePath\AssemblyInfo.cs");
string contents = reader.ReadToEnd();
reader.Close();
string NewCopyrightText = "Yippie. All rights reserved " + DateTime.Now.Year;
string replacement = "[assembly: AssemblyCompany(\"" + NewCopyrightText + "\")]";
contents = Regex.Replace(contents, @"\[assembly: AssemblyCompany\("".*""\)\]", replacement);
StreamWriter writer = new StreamWriter(@"C:\FilePath\AssemblyInfo.cs", false);
writer.Write(contents);
writer.Close();
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Thanks for the suggestion, but I was looking for a method of accomplishing this without the overwrite of AssemblyInfo.cs.
The consumer isn't a moron; she is your wife.
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Exactly, you only need the word. You use the symbol when there isn't enough room for the word.
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How can I run a program from inside my own.
by delphi I can do it by putting WinExec command
in my source code. what is the equivalent command in
sweet Language of C#? tnx
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There is a thing called "the documentation", it holds answers to such elementary questions. Look for the Process class.
Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum
Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.
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I know there are many things to reffer. but cant u
answer a little more explicit? thanks anyway.
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He did. It's your job as a programmer to understand the classes you're using. Read the documentation on the Process class and you'll probably end up learning a lot about the Process class instead of knowing just the single little use case that someone gives you in a code sample.
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Hi,
I have to write an application that has the ability to perform a system-restart, shutdown or user-logoff. So far, I have found two solutions to do it, which both work very well. I'd like to know which is the best way to do it, i.e. if there are any disadvantages to the one or the other way to do it. Which is the most professional way to deal with it?
Currently, I use the System.Management Namespace, whic looks like the most elegant way to do this to me:
ManagementBaseObject mboShutdown = null;
using (ManagementClass mcWin32 = new ManagementClass("Win32_OperatingSystem"))
{
mcWin32.Get();
mcWin32.Scope.Options.EnablePrivileges = true;
ManagementBaseObject ShutdownParams = mcWin32.GetMethodParameters("Win32Shutdown");
ShutdownParams["Flags"] = "1";
ShutdownParams["Reserved"] = "0";
foreach (ManagementObject manObj in mcWin32.GetInstances())
{
mboShutdown = manObj.InvokeMethod("Win32Shutdown", ShutdownParams, null);
}
ret = true;
}
On the other hand, I have found many users who load the appropriate system-DLLs, and perform the whole tsak "unmanaged", an call ExitWindowsEx from these DLLs. This works too, but I am wondering why people decide to do it this way, if there is a namespace available in .NET that actually does it, like in my example above.
Which way would you chose, and why?
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I have used neither one. I think I once used something akin to "Process.Start("shutdown").
Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum
Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.
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The un-managed code is not recommended one in long term, although it is faster way to achieve same.
With managed, good way is:
using System.Diagnostics;
ProcessStartInfo startinfo = new ProcessStartInfo("shutdown.exe","-r");
Process.Start(startinfo);
Keep in mind the options you want to use:
-i Display GUI interface, must be the first option
-l Log off (cannot be used with -m option)
-s Shutdown the computer
-r Shutdown and restart the computer
-a Abort a system shutdown
-m \\computername Remote computer to shutdown/restart/abort
-t xx Set timeout for shutdown to xx seconds
-c "comment" Shutdown comment (maximum of 127 characters)
-f Forces running applications to close without warning
-d [u][p]:xx:yy The reason code for the shutdown, u is the user code, p is a planned shutdown code, xx is the major reason code (positive integer less than 256)
,yy is the minor reason code (positive integer less than 65536)
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RaviSant wrote: The un-managed code is not recommended one in long term
Got a citation for this??
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Dave Kreskowiak wrote: Got a citation for this??
Certainly is something I try to avoid since incorrect usage of interop or even the unmanaged itself code can cause an OS system exception thus exiting the app. That behavior is not acceptable in a server application. Probably not something that one wants to occur in any app as well.
The following certainly would suggest that there are reasons that one might want to look for other options.
http://msdn.microsoft.com/en-us/library/ms973872.aspx#manunman_topic4[^]
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The most direct and rock solid way to do it, with the greatest amount of control, is ExitWindowsEx. I don't like using WMI because it has a habit of silently commiting suicide and you're left wondering why your call that used to work fine suddenly fails with cryptic errors, like "RPC Server unavailable".
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Dear all,
Im using this code to get the names of shared network drives in my computer:
DriveInfo[] allDrives = DriveInfo.GetDrives();
foreach (DriveInfo d in allDrives)
{
if (d.DriveType == DriveType.Network)
{
Response.Write(d.Name);
}
}
In win xp this works fine, but in windows7 i can only see the local drives.
Any idea why ? and how to solve this?
Thanks in advance.
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Priya Prk wrote: In win xp this works fine, but in windows7 i can only see the local drives.
how that is possible to see the local drives after using given code. It will display only when you will use DriveType.Fixed [as I know]
Check your code it only display Network Drives Name not LocalDrives Name because Response.Write(d.Name)
only works and print the Name of Drives when DriveType will equals to DriveType.Network
Take a look you've applied condition.
Priya Prk wrote: if (d.DriveType == DriveType.Network)
{
Response.Write(d.Name);
}
modified on Friday, January 14, 2011 5:19 AM
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I think what he means is that d.DriveType == DriveType.Network is never true under Windows 7, while it is under Windows XP. If you look, the OP does say that the code works under XP...
Real men don't use instructions. They are only the manufacturers opinion on how to put the thing together.
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Hi all,
My bad.
OriginaGriff is right.. DriveType.Network is never true.
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