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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',
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;
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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