nimforum mirror - error passing cstring to wrapped function

jpoirier (orginal) [2014-12-27T16:35:01+01:00] view original

Hi,

I'm getting "SIGSEGV: Illegal storage access. (Attempt to read from nil?)" errors when passing a cstring to a wrapped library function.

when defined(windows):
    const Lib = "XPLM_64.dll"
elif defined(macosx):
    const Lib = "XPLM_64.dylib"
else:
    const Lib = "XPLM_64.so"

# XPLMDebugString
#
# This routine outputs a C-style string to the Log.txt file.  The file is
# immediately flushed so you will not lose  data.  (This does cause a
# performance penalty.)
#
# XPLM_API void XPLMDebugString(const char* inString);
#
proc XPLMDebugString*(inString: cstring) {.cdecl, importc: "XPLMDebugString", dynlib: Lib}

Example code:

var starup_msg: cstring = "CommViewer Plugin: startup completed\n"
XPLMDebugString(starup_msg) # <- this causes the Illegal storage access error

I'm using Nim Compiler Version 0.10.1 (2014-12-27) [Linux: amd64]

thanks, joe

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690 :: error passing cstring to wrapped function