# Sub all 
# cTblAtKey -> findInTableByKey
# cTbl -> myTable
# cCell -> myCell
# ctbl_v2 -> myDll

my $aKey = "UserName";
print $aKey."\n";
my $lengthaKey = length($aKey);
print $lengthaKey."\n";
Win32::API::Struct->typedef(CSTRREF =>qw{int n; char* buffer});
my $structParameter = Win32::API::Struct->new('CSTRREF');
$structParameter->{n}=$lengthaKey;
$structParameter->{buffer}=$aKey;
# C function defined as:
# myCell* findInTableByKey(myTable that, struct cRefStr key, unsigned offset);
# with: 
# struct myCell { 
# 	unsigned char opaque[10]; 
#};
my $aKeyFunc = Win32::API->new("myDll.dll",'findInTableByKey', 'NSN','C','_cdecl');
if(not defined $aKeyFunc)
{
	die "Couldn't load the function findInTableByKey from the dll";
}
$cellPtr = $aKeyFunc->Call($outputTable,$structParameter,0);