You are mixing C++ template and .NET generics. This is OK is you understand what are you doing.
In your specific case, this is classic C++ template problem. To call templated function C++ compiler must see the function implementation, and not only prototype. So, you can instantiate IsVisible function only in the same .cpp file. Or make it inline by moving the function implementation to .h file.
[Marking as NEWS - this is not a question but this is an appropriate forum IMO]
If you develop in C++/CLI with Visual Studio 2017, beware that update 15.9.6 introduced a very bad codegen bug. C++/CLI apps will crash if you use /std:c++17 or /std:c++latest. The workaround is to drop back to C++14 language support.
I am working on some examples of my own and now looking to include a new class for my Banking transactions.
Seems like I am doing something in the wrong place etc.
I typed in the new code ahead of the standard code created by Visual Studio (17) (I didn't add an item). The information I wanted to create appears in the right hand window CLASS VIEW but I get the errors.
shows the class and items above
1>------ Build started: Project: Santander01, Configuration: Debug Any CPU ------
1>C:\Users\HOME\Documents\Visual Studio 2017\Projects\Santander01\Santander01\Form1.cs(19,8,19,23): error CS0116: A namespace cannot directly contain members such as fields or methods
1>C:\Users\HOME\Documents\Visual Studio 2017\Projects\Santander01\Santander01\For
I am trying to build some simple examples as part of my learning process.
I have created a form which includes the dateTimePicker and tried several combinations which have failed. The output initially displays time as HH:MM:00 and only dis[plays correct time when I include
I'd like to format - say
and failed to complie with the following error - is this what you meant.
When I follow your link it refers to C# whereas I am working with C##.
Severity Code Description Project File Line Suppression State
Error C2228 left of '.ToString' must have class/struct/union Project1 c:\users\home\documents\visual studio 2017\projects\project1\project1\myfirstform.h 335
Error (active) E0153 expression must have class type Project1 C:\Users\HOME\Documents\Visual Studio 2017\Projects\Project1\Project1\MyFirstForm.h 336
Very mixed background
Wrote first programs in 60's (machine code, user code, Fortran, Algol & many more)
Moved into IT sales / management
Have developed Forex applications in MT4 which is sort of C based
Started with this C++ / CLi on Saturday - so sort of making progress
I've fought shy of 'understanding' the ins / outs of C
Now retired and need to keep brain cells stimulated !
Thanks for support & comments and will read around
Since you have only just started with C++/CLI, my advice would be to stop now and switch to C#. It is so much better for this sort of application, and the learning curve is not as bad as it may at first appear. There is a great free starter document at .NET Book Zero[^] which you can work through fairly quickly. Like you, I am retired and followed this route myself, so I am far from being a C# expert, but I can code simple applications without too much trouble.
hi guys love this site so helpful. i have a c++/cli program im writing. im not going to post no code at this time cause i hope my problem can be solved with just a explanation. in my main form i run some code that controls a pic chip that runs some servo motors, communicating through the serial port. all runs fine. the problem im having is that well you know serial port is on another thread. so i use invoke and run a data received method on the ui. now that has a switch statement that may call some other functions in my ui thread that all works fine until one of the functions actually needs some input from the serialport. but i dont get any data in until the invoke completes. i tryed to run it with begininvoke which seems to work fine for the serialport but the ui doesnt update the form at all during the invoktion. so i thought i would just try to have the datareceived funtion fire an event on the ui. but then i get a crossthread error. maybe im not doing the event correctlly im still trying to get my head around delegates and events. question? does this seem reasonable? what i need to do is get that serialport freed up so that it can receive data again while the ui runs its code. Please bear with me im learning. and i have been reading post after post about threads, delegates, and events. ive problebly seen the answer and didnt know it. ill be happy to read im just not sure of the correct implementation. and im writing this in c++/cli cause i copied some code from an old borland c++ program. thanks in advance. yes i could post some code but ill have to clean it up first and pick out important parts right now its quite sizable.
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