Rif.: problems to read a registry key REG_SZ

[DamBalzani]

hi everybody,

i'm tryng to read the value of a particular regster named ParentIDPrefix. It is visible on picture

i'm using this funcion:

RegReadString( HKEY_LOCAL_MACHINE, "\\SYSTEM\\CurrentControlSet\\Enum\\USB\\6&85f603c&0&2", "ParentIdPrefix", NULL, 0, &size);

but it doesn't work and returns thi error:

"Could not open Registry Key"

Can you help me?

[CorraDIT]

Hi DamBalzani,

it could be a permission error. Did you try star LabVIEW as an administrator?

Best,

CorraDIT

[CorraDIT]

...and by LabVIEW I mean LabWindows/CVI.

CorraDIT

[DamBalzani]

i found a solution!

the application has the permission to read.

The problem is the function. The correct function is:

RegQueryInfoOnKey (HKEY_LOCAL_MACHINE, "SYSTEM\\CurrentControlSet\\Enum\\USB\\VID_0403&PID_6010&MI_00\\7&25052fd2&0&0000", NULL, &values, NULL, NULL, NULL);

But now I have another problem: I have 2 FTDI4232 on my board. How can I select one? Because the 2 devices give me the same information. How can i use the registry key to select one?

Thanks