On Jul 20, 2006, at 12:45 PM, Adam Ernst wrote:
How can I construct a char** array to pass to a declare? I've tried
the following, but it doesn't seem to work (attrs is a string
array, which I am attempting to convert into a memoryblock):
dim attrP as MemoryBlock
attrP = new MemoryBlock((UBound(attrs)+2)*4) // Num elements,
plus one for NULL termination, times pointer size
for lc as Integer = 0 to UBound(attrs)
dim m as new MemoryBlock(LenB(attrs(lc))+1)
m.CString(0) = attrs(lc)
attrP.Ptr(lc*4) = m
next
It would help to know what you mean by "doesn't seem to work", but
I'd guess that the problem is you aren't keeping any permanent
references to the string memoryblocks. The loop creates a new
memoryblock for each string, copies data into it, then forgets about
it, at which point the memoryblock is deleted. This leaves a dangling
pointer in your array buffer. The solution is to keep a list of the
blocks you've allocated until the call to the external library returns.
Mars Saxman
REAL Software
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