Hmmmm. Not an Perl OLE expert, but, it seems GetPrecursorInfoFromScanNum returns a Variant array of C structs, not an variant array of integers according to the manual. Every example in the manual is C/C++, zero VB. Is your 
"Output:

$VAR1 = [
          '414.005279541016',
          '1.83302424514875e-307',
          '3.50253979763967e-310',
          '1.36817960845299e-312',
          '2.68156223007842e+154',

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even valid compared to Thermo's official viewer for the file?

I think you need to try to get perl OLE to return an array of string, the strings will be binary garbage but should be 8+8+4+4 bytes long, then do an "unpack('FFll',$arr[$i]);" on it to decode the C struct. Try looking for Visual Basic code for your control and see how its done there. 
typedef struct tagMS_PrecursorInfo {
        
double dMonoIsoMZ;
        
double dIsolationMZ;
        
long nChargeState;
        
long nScanNumber;
} MS_PrecursorInfo;

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I pulled that from the IDL inside your control. Its described the same way in manual page for GetPrecursorInfoFromScanNum. Can you point me to a sample raw file for this control?

Edit, try changing "my $arr = Variant( VT_VARIANT | VT_BYREF);" to " my $arr = Variant( VT_ARRAY | VT_BYREF);"

In reply to Re: Getting mixed real and integer data out of Win32::OLE Safearray by patcat88
in thread Getting mixed real and integer data out of Win32::OLE Safearray by Halligan

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