I am trying to call MsiEnumProductsExW. The problem I am running into is that the for-loop below never exits. My assumption is that my err == windows.ERROR_NO_MORE_ITEMS is wrong.

My code:

var (
    msiDLL                 = syscall.NewLazyDLL("msi.dll")
    procMsiEnumProductsExW = msiDLL.NewProc("MsiEnumProductsExW")
)

func getMsiSoftware() (/*redacted*/, error) {
    var index uint32 = 0
    var bufSize uint32 = 39 // GUID length (including terminating nul character)
    productCode := make([]uint16, bufSize)

    for {
        _, _, err := procMsiEnumProductsExW.Call(
            uintptr(0),
            uintptr(0),
            uintptr(0),
            uintptr(index),
            uintptr(unsafe.Pointer(&productCode[0])),
            uintptr(0),
            uintptr(0),
            uintptr(0),
        )

        if err == windows.ERROR_SUCCESS {
            // For the same of a minimal reproducible example, I don't do anything with
            // productCode right now
            index++
        } else if err == windows.ERROR_MORE_DATA {
            // Increase buffer size if needed and call again
            productCode = make([]uint16, bufSize*2)
        } else if err == windows.ERROR_NO_MORE_ITEMS {
            break
        } else {
            return nil, fmt.Errorf("retrieving MSI product codes failed")
        }
    }

    return nil, nil // Satisfy the compiler
}

How can I correct my logic to correctly check if the MsiEnumProductsExW returns ERROR_NO_MORE_ITEMS?