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I have a problem setting a class constant in my C# assembly to the value of a constant in a managed C++ class. The compiler does not seem to recognise that the managed C++ class constant is constant. The error message is shown below:
#error = "The expression being assigned to 'MyAssembly.SMyFooBar.bahName' must be constant
What Have I done wrong here?
I am writing in Visual Studio 2003 on WinXP SP2 with .Net Framework V2.0.50727
The reason for this attempt is that the majority of our code is unmanaged c++, which uses a glabal header file to set values through a number of
projects.
I wish to include this header in our various new C# projects, and thus avoid double maintenance. If the header file changes, all that is needed is a code recompile, at least in theory.
To do this I wrapped the header file inside a managed c++ class to create a dll. I then included this dll as a reference in my C# project so that I
could use it to initialise some c# constants, thus:
-- unmanaged C++ header
// CPPHeader.h
#ifndef CPPHeader_defined_hpp
#define CPPHeader_defined_hpp
#define MAX_FOOBARS 3
#define FOOBAR_NAME "Foo Bar"
#endif // CPPHeader_defined_hpp
---------------------
-- managed C++ class
//MyManagedClass.h compiled to a DLL
#pragma once
#include "CPPheader.h"
using namespace System;
public __gc class SMyManagedClass
{
public:
static const int maxFooBars = MAX_FOOBARS;
static const String* FooBarName = FOOBAR_NAME;
};
--------------------------
-- C# assembly
//MyFooBarAsembly.cs
using system;
using SMyManagedClass;
namespace MyAssembly
{
public class SMyFooBar
{
public const int maxBahs = SMyManagedClass.SMyManagedClass.maxFooBars;
public const string bahName = SMyManagedClass.SMyManagedClass.FooBarName;
}
}
OrcBighter2
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You probably need to use readonly. There are differences in lookup rules that may exclude this from working.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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Currently I'm able to create a combox box in ListView in Windows Form (PC application) with mouse up event in ListView, by using C#.
But is it possible to do the samething for Pocket PC Application? I'm unable to find the mouse up event in ListView. I've do lot of searching in ineternet but stilll unable to find a related article.
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Hi friends;
I need exactly free db for .net, I will use c# for project and project will be commercial package program. So I dont struggle with server system.I prefer ms access. Is there free database like ms access?
Thanks
I need your answers
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Hi;
Thanks for quick response. Can I use firebird like access?
I mean If I develop a program with firebird database and If I wanna run this program on other computer do have to setup firebird?
Did I explain?
I need like access system, I wish that I explained
I wait your answer
Thanks
Best Regards
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tyleray wrote: Can I use firebird like access?
I mean If I develop a program with firebird database and If I wanna run this program on other computer do have to setup firebird?
The docs are always a good place to start..
Read this[^]
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Any ideas what I'm really meant to be doing in the lines marked as "won't compile" below?
<br />
using System;<br />
<br />
namespace Test<br />
{<br />
public class MyClass : GenericsTest<<MyClass>><br />
{<br />
public void DoSomething()<br />
{<br />
base.DoSomething();<br />
}<br />
}<br />
<br />
public class GenericsTest<<T>> where T : class<br />
{<br />
SomeHelperClass<<T>> helper;<br />
<br />
public GenericsTest()<br />
{<br />
helper = new SomeHelperClass<<T>>();<br />
}<br />
<br />
public void DoSomething()<br />
{<br />
helper.DoSomething(T);
helper.DoSomething(this);
}<br />
}<br />
<br />
public class SomeHelperClass<<T>> where T : class<br />
{<br />
public void DoSomething(T target)<br />
{<br />
}<br />
}<br />
}<br />
TIA!
-- modified at 21:11 Thursday 3rd August, 2006
Bah, the lt's and gt's get nuked when posting - just imagine the double lt's and gt's are actually single..
-- modified at 21:12 Thursday 3rd August, 2006
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Furty wrote: just imagine the double lt's and gt's are actually single..
Or you could check the 'Ignore HTML tags in this message (good for code snippets)' box.
Furty wrote: helper.DoSomething(T); // won't compile
T is a type. You want to pass in an instance of T.
By the way, posting error messages is far more helpful that 'it won't compile'
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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Furty wrote: helper.DoSomething(T); // won't compile
That should compile.
Furty wrote: helper.DoSomething(this); // won't compile
That shouldn't compile. You are clearly passing the wrong type.
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what is the best way to print a windows application form.
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There is no "best" way, it depends on what you are trying to accomplish. Do you have a more specific question or problem?
only two letters away from being an asset
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I am creating a form from a pdf and it is to draw material from a database to populate the form. Then I need to be able to print or save to a pdf.
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I've had to do this once. We used a third party library of which I can't remember right now.
only two letters away from being an asset
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The best way to print from a window application is using crystal reports. Then as my friend said all depends on what kind of application ur working with. Basically if u r to show something like a report the best way to do is by creating crystal reports.
Vipin
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Vipin Venugopal wrote: The best way to print from a window application is using crystal reports.
I bit of overkill if you ask me. Plus the overhead of CrystalReports, licensing etc.
only two letters away from being an asset
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Hi guys,
A general question, is there a disadvantage/advantage of working with the registry or XML document. Do Admin rights issue come in if you are saving everything on the registry?
Please advice.
sasa
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Off the top of my head, XML seems the safest. Because, even if the user had Power User privildges, they still can't edit other accounts - so some reg keys might not be accessable.
I'm running power user right now, and I can't install many things, e.g. Flash, VS Express, DirectX, WGA Plugin, Alcohol 120%, etc...
However, I CAN install firefox.
I'm not sure what the pattern is....
/\ |_ E X E GG
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hi all,
how can i find index of selected cell in a row ?
i have a textbox on my form.
and i want to assign the selected cell's value to the textbox.
what should i write into which event ? selectionchanged ¿
help please...
thanks in advance,
bye.
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use datagridview.SelectedCell.Row
this gives the row no.
Regards,
Pramod
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i want 2 automate the proccess of login into site usin Htaccess.. and instead of enetering the user/pass in the annoying popup window i wanna login directly into the site.. .like http://user:pass@www.blah.com... but this is not available in IE..
so i wodered if there any way from c# (maybe using axWebBrowser, or something else) 2 fill the 2 fileds of user/pass automaticly into the pop up window, or skip it completly
cause i open the ie from c# like that:
System.Diagnostics.Process.Start("iexplore.exe",site)
and i have the user/pass already stored in xml file...
so i dont wanna retype it again int the pop up window of HTaccess
thx ahead!
-- modified at 6:21 Friday 4th August, 2006
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Is there anyway to create a standalone dropdown button thats not in a toolbar strip?
Thanks, Ben.
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You could make a custom control that would mimic the Toolbar Strip Drop Down Button.
Regards,
1tg46
Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning.
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Greetings:
Im trying to change an image to only two colors (B&W) based on a threshold value, to do this i first turn it to grayscale using a colormatrix, then, if the rgb grey value is bigger than the threshold value it turns black, if its lower it turns white, or viceversa. As for now, im doing this pixel by pixel, but its too slow, is there a better, faster way for doing this, and if so how?
Thanks in advance
"Failure is the best reason to start all over again with more knowledge"
-Henry Ford
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