mdf() function with German Umlaut ä,ö,ü or other special characters

Hi,

I have been using the mdf() function for quite a while now for GUI tools to convert mdf files etc.

Somewhere between Matlab 2018b and 2019b the mdf() function lost its ability to interpret German umlauts within the input string. I get the error message:

"Can't create a std::string from this data"

For example, this error appears when I try to read a file called "äb.mf4". It was still possible on Matlab 2017b and 2018b.

Any way to deal whith this? I cannot use strrep or other functions as I cannot change the names of my input file names or paths accordingly.

Thanks!

[Benjamin Frank]

Hi,

same problem here. As soon as there is special characters in the file name (e.g. "°" in °C) this error occures.

A colleague of mine used 2019a and was additionally able to import channel names with a § sign in it.

With version 2019b this ain't possible anymore. Seems like a throwback to me.

The only workaround is to import the given data in CANape and remove the error rising channel which is not very practicable with a huge amount of files.

I'd really appriciate a official statement.

Thanks in advance!

[Frank Wuechner]

Hi,

any news or statements on this issue? It would be very welcome. After some waiting, I wrote a workaround today:

Before calling mdf(), I check for sepcial characters in the file's path or name and load a copy of the file with a dummy name in mdf(). The only drawback (apart from additional code) is that I can't delete this dummy file somehow from the Matlab working directory with delete() from my script as it seems to be blocked by a process. Maybe this is because of my poor programming skills or because mdf() doesn't close the file handle properly...

Thanks!

[Shouyuan Chen]

Hi,

my friend. Try to make sure, that in ur Path, there is not ''incompatibe" Alphabet, for example, ü,ä or other language. This Error will automatic solved, when I use the Path only in English

[Huadong Niu]

2018a可以用中文做文件名，但是2020a和2020b在matlab m文件和命令行就不能用中文名了，否则会报出Can't create a std::string from this data.的故障，这非常的奇怪。mlapp文件中 代码使用mdf（）函数，也不可以用中文名的

Answer 1

[Michelle Wu]

Vehicle Network Toolbox R2021a contains improved support of international characters for the MDF functions. Please upgrade to R2021a and error should be resolved.