Can't write char array to Windows Registry key

I am trying to write to the Windows Registry using the Win32 API, but for some reason when I try writing bytes to a Registry key with the REG_BINARY data type, the key value does not change.

Here is code that attempts to write to the Registry key:

struct angles
{
    float pitch;
    float yaw;
    float roll;
};
    
int main()
{
    angles ang;
    ang.pitch = 69.25;
    ang.yaw = 420.21;
    ang.roll = 100.0;
    unsigned char b[sizeof(ang)];
    
    std::cout << "Size of structure: " << sizeof(ang) << "\n\n";
    
    memcpy(b, &ang, sizeof(ang));
    
    for (int i = 0; i < sizeof(b); i++)
    {
        printf("Byte %d == %02X ", i, b[i]);
        std::cout << "\n\n";
    }
    
    HKEY handle;
    if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run", 0, KEY_WRITE, &handle) == ERROR_SUCCESS)
    {
        if (RegSetValueEx(handle, L"test", 0, REG_BINARY, (BYTE*)&b, sizeof(b)) == ERROR_SUCCESS)
        {
            std::cout << "Wrote to key test.\n\n";
        }
        else
        {
            std::cout << "Couldnt write key\n";
        }
    }
    else
        std::cout << "couldn't open key\n";
    
    while (!GetAsyncKeyState(VK_NUMPAD0))
    {
    
    }
    
    return 0;
}

If you compile the code, you'll see that I am copying the bytes of the angles struct into the char array b.

When calling RegOpenKeyEx(), it succeeds. And when calling RegSetValueEx(), it succeeds. But, the value in the Registry does not change.

So, I'm not sure what to do at this point. I am running the application as admin as well.

Copyright Notice：Content Author:「Ballers」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/63254655/cant-write-char-array-to-windows-registry-key