Adding string$ variable and string together

[PresFox]

Hello

I am trying to compile this:

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runprogram(configvalue$(0)+"mysqld-nt.exe")

configvalue$(0) holds the path, mysqld-nt.exe is the filename. However, this doesnt work, what is the way to get string variables and strings together?

Regards

[AND51]

Maybe the path does not end with a backslash.
Example:

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path$="C:\WINDOWS"
file$="notepad.exe"

Debug path$+file$

RunProgram(path$+file$) ; DOESN'T WORK

This won't work, because every path in PureBasic usually ends with a trailing Backslash!

Two codes how to check+correct this mistake:

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path$="C:\WINDOWS"

If Right(path$, 1) <> "\"
   path$+"\"
EndIf

Debug path$

Shorter, but Windows-Only:

Code: Select all

path$="C:\WINDOWS"

PathAddBackslash_(@path$)

Debug path$

Both codes do the same. The second code uses API, so it should be faster, but it's only available on Windows. If you use the second code, don't forget the @ in front of the variable name!
PathAddBackslash_() expects the pointer to the variable, that's why you must type the @.



If a missing backslash is not the reason, the variable could be emptry or the path/file doesn't exist. Another reason might be insufficient rights or ressources to execute the destination program.

[PresFox]

Got it fixed, thank you for your help

[AND51]

No problem, mate.

[freak]

The API code is dangerous, as it will write over the end of the PB allocated memory.
You are asking for trouble with that one.

[AND51]

Oh, you mean the API replaces the trailing NULL with a Backslash?
I though this almost, but I wasn't sure. Although I never had problem with it, I now tend to use the PB code then.
Thank you for this information!

[PB]

@AND51: See this post where PathAddBackslash was discussed in detail:
http://www.purebasic.fr/english/viewtopic.php?t=25578