DirectX9

[electriac]

In C# code how can I detect if Directx9 is installed on the user machine?

[markovl]

You can check the value of the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectX\Version registry key. This table[^] will show you the version according to the version number. For example 4.09.00.0904 is DirectX 9.0c.

2A

[electriac]

I was able to do this on XP but I can't get any code to work on Win X64 could you give me an example. TNX

[Dave Kreskowiak]

You have to look at the same path under the SOFTWARE\Wow6432Node\...

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Dave Kreskowiak

[electriac]

This seems to be working. Any suggestions? I guess I will have to identify the OS and have an alternative for XP - right? Many thanks!

public void readRegistryForDX9()
{
RegistryKey rk = Registry.LocalMachine;
RegistryKey sk = rk.OpenSubKey("SOFTWARE\\Wow6432Node\\Microsoft\\DirectX");
string temp = (string)sk.GetValue("Version");
if (temp.IndexOf("4.09")<0) MessageBox.Show("Directx 9 Must be installed");
else MessageBox.Show("Directx 9 already installed");
return;
}

[Dave Kreskowiak]

You don't need to "read the OS". You just look under one registry path and if the value isn't there, you look under the other one. If it's not under either, DirectX isn't installed.

A guide to posting questions on CodeProject[^]
Dave Kreskowiak

[markovl]

What Dave said above should do it. One note though - be sure to free any resources used by the RegistryKey objects - encolsing them in using statements is good:

using (RegistryKey sk = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Wow6432Node\\Microsoft\\DirectX"))
{
// the rest of your code;
}

It's also good practice to check sk for null as if the key's not present on the system sk.GetValue("Version") will thrown an exception. P.S. No need to explicitly return from a void method.

2A

[electriac]

Markovl - TNX: