Get Windows ID c++

Question

I would like read the Windows ID in my program. So I use RegGetValue in

TCHAR value[255]; DWORD BufferSize = 255; int a=RegGetValue(HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion", "ProductId", RRF_RT_ANY, NULL, (PVOID)&value, &BufferSize);

My problem is that in 64 bits OS the function read the folder "SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion" and not "SOFTWARE\Microsoft\Windows NT\CurrentVersion"

Unfortunetaly ProductID and DigialProductID is not in the 64 register.. How I could force the read or obtains the Window ID

Best Regards

You probably shouldn't be checking the version number this way unless its for something like logging or reporting telemetry. If you want to check if you are running a version of windows or greater use the version api helper functions. If you want to check if a feature is present there are generally better ways in a feature specific pattern. If you still want to get the version its explained on the version api helper functions docs how to do that. — Mike Vine
– Mike Vine, Commented Mar 10, 2015 at 16:01

Mark Ransom · Accepted Answer · 2015-03-10 17:35:24Z

1

HKEY key = NULL; RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion", 0, KEY_QUERY_VALUE | KEY_WOW64_32KEY, &key); int a = RegGetValue(key, "", "ProductId", RRF_RT_ANY, NULL, (PVOID)&value, &BufferSize);

edited Mar 10, 2015 at 17:35

answered Mar 10, 2015 at 14:55

Mark Ransom

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4 Comments

Boz Over a year ago

HKEY key = NULL; RegOpenKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion", 0, KEY_WOW64_32KEY, &key); int error=GetLastError(); int a = RegGetValue(key, "", "ProductId", RRF_RT_ANY, NULL, (PVOID)&value, &BufferSize); error is 0 but a is 87 and value is empty

Mark Ransom Over a year ago

@Boz I've made an edit, I forgot an essential parameter. And error code 87 is ERROR_INVALID_PARAMETER.

Boz Over a year ago

Error 2 :( (ERROR_FILE_NOT_FOUND) So I will use cmd for write in file and read it.

Mark Ransom Over a year ago

@Boz try KEY_WOW64_64KEY too.

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