Check if EXE is x64?

[fhpuqrgrpgvirzhpujbj]

How can I check if an EXE is 64 bit with code?

[simsie]

If you're coding in vb.net I believe it will be 32-bit on 32-bit systems and 64-bit on 64-bit systems. With that said run it on an x64 system and look at the processes tab in Task Manager. If your exe has *32 next to it then it's NOT 64-bit.

[fhpuqrgrpgvirzhpujbj]

I need a programmatic solution to check it as the user is the one that chooses the exe. I'm drawing a blank on how to do it, though.

[Mike]

Use IntPtr.Size and if it returns 4 then it's 32bit, or 8 for 64-bit.

[hdood]

Presumably he wants to know so he can load the correct non-platform neutral code.

The simplest way to do it is this:

if(IntPtr.Size == 4) // is 32-bit

else if(IntPtr.Size == 8) // is 64-bit

Or do you want to check what architecture an external exe is, not yourself?

[fhpuqrgrpgvirzhpujbj]

I want to check an external exe.

[Mike]

have a look at http://msdn.microsoft.com/en-us/library/aa364819(VS.85).aspx

[hdood]

Okay, in that case the only real way I can think of is by loading the file and analyzing its header.

I've put together a basic example (minus error checking) that is all-managed:

private void button1_Click(object sender, EventArgs e)
{
	openFileDialog1.ShowDialog();
	Stream fs = openFileDialog1.OpenFile();

	BinaryReader br = new BinaryReader(fs);

	UInt16 mz = br.ReadUInt16();
	if (mz == 0x5a4d) // check if it's a valid image ("MZ")
	{
		fs.Position = 60; // this location contains the offset for the PE header
		UInt32 peoffset = br.ReadUInt32();

		fs.Position = peoffset + 4; // contains the architecture
		UInt16 machine = br.ReadUInt16();

		if (machine == 0x8664) // IMAGE_FILE_MACHINE_AMD64
			textBox1.Text = "AMD64";
		else if (machine == 0x014c) // IMAGE_FILE_MACHINE_I386
			textBox1.Text = "i386";
		else if (machine == 0x0200) // IMAGE_FILE_MACHINE_IA64
			textBox1.Text = "IA64";
		else
			textBox1.Text = "Unknown";
	}
	else
		textBox1.Text = "Invalid image";

	br.Close();
}

[fhpuqrgrpgvirzhpujbj]

Ah thanks much hdood. That works great. :)