I suppose that you try to use MsiGetProductInfo to get a property other as described in documentation. For example you can get in the way the value of the "PackageCode" property (INSTALLPROPERTY_PACKAGECODE) without any problem, but you can't get the value of the "UpgradeCode" property with respect of MsiGetProductInfo and receive the error 1605 (ERROR_UNKNOWN_PRODUCT).
UPDATED: OK, now I understand you problem. How you can find in the internet there are a bug in MsiGetProductInfo, so it work not always. Sometime it get back 1605 (ERROR_UNKNOWN_PRODUCT) or 1608 (ERROR_UNKNOWN_PROPERTY) back. In the case as the only workaround is to get the version property manually. I could reproduce the problem which you described on my computer with the Microsoft Office Outlook 2010 MUI (UpgradeCode = "{00140000-001A-0000-0000-0000000FF1CE}") and wrote a workaround where I get the product version from the registry. In the example I get information only from HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products. If you have an interest to products installed not only for all users you have to modify the program. Here is the code
using System;
using System.Text;
using System.Runtime.InteropServices;
using Microsoft.Win32;
namespace EnumInstalledMsiProducts {
internal static class NativeMethods {
internal const int MaxGuidChars = 38;
internal const int NoError = 0;
internal const int ErrorNoMoreItems = 259;
internal const int ErrorUnknownProduct = 1605;
internal const int ErrorUnknownProperty = 1608;
internal const int ErrorMoreData = 234;
[DllImport ("msi.dll", CharSet = CharSet.Unicode, SetLastError = true)]
internal static extern int MsiEnumRelatedProducts (string lpUpgradeCode, int dwReserved,
int iProductIndex, //The zero-based index into the registered products.
StringBuilder lpProductBuf); // A buffer to receive the product code GUID.
// This buffer must be 39 characters long.
// The first 38 characters are for the GUID, and the last character is for
// the terminating null character.
[DllImport ("msi.dll", CharSet = CharSet.Unicode, SetLastError = true)]
internal static extern Int32 MsiGetProductInfo (string product, string property,
StringBuilder valueBuf, ref Int32 cchValueBuf);
}
class Program {
static int GetProperty(string productCode, string propertyName, StringBuilder sbBuffer) {
int len = sbBuffer.Capacity;
sbBuffer.Length = 0;
int status = NativeMethods.MsiGetProductInfo (productCode,
propertyName,
sbBuffer, ref len);
if (status == NativeMethods.ErrorMoreData) {
len++;
sbBuffer.EnsureCapacity (len);
status = NativeMethods.MsiGetProductInfo (productCode, propertyName, sbBuffer, ref len);
}
if ((status == NativeMethods.ErrorUnknownProduct ||
status == NativeMethods.ErrorUnknownProperty)
&& (String.Compare (propertyName, "ProductVersion", StringComparison.Ordinal) == 0 ||
String.Compare (propertyName, "ProductName", StringComparison.Ordinal) == 0)) {
// try to get vesrion manually
StringBuilder sbKeyName = new StringBuilder ();
sbKeyName.Append ("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Installer\\UserData\\S-1-5-18\\Products\\");
Guid guid = new Guid (productCode);
byte[] buidAsBytes = guid.ToByteArray ();
foreach (byte b in buidAsBytes) {
int by = ((b & 0xf) << 4) + ((b & 0xf0) >> 4); // swap hex digits in the byte
sbKeyName.AppendFormat ("{0:X2}", by);
}
sbKeyName.Append ("\\InstallProperties");
RegistryKey key = Registry.LocalMachine.OpenSubKey (sbKeyName.ToString ());
if (key != null) {
string valueName = "DisplayName";
if (String.Compare (propertyName, "ProductVersion", StringComparison.Ordinal) == 0)
valueName = "DisplayVersion";
string val = key.GetValue (valueName) as string;
if (!String.IsNullOrEmpty (val)) {
sbBuffer.Length = 0;
sbBuffer.Append (val);
status = NativeMethods.NoError;
}
}
}
return status;
}
static void Main () {
string upgradeCode = "{00140000-001A-0000-0000-0000000FF1CE}";
StringBuilder sbProductCode = new StringBuilder (39);
StringBuilder sbProductName = new StringBuilder ();
StringBuilder sbProductVersion = new StringBuilder (1024);
for (int iProductIndex = 0; ; iProductIndex++) {
int iRes = NativeMethods.MsiEnumRelatedProducts (upgradeCode, 0, iProductIndex, sbProductCode);
if (iRes != NativeMethods.NoError) {
// NativeMethods.ErrorNoMoreItems=259
break;
}
string productCode = sbProductCode.ToString();
int status = GetProperty (productCode, "ProductVersion", sbProductVersion);
if (status != NativeMethods.NoError) {
Console.WriteLine ("Can't get 'ProductVersion' for {0}", productCode);
}
status = GetProperty (productCode, "ProductName", sbProductName);
if (status != NativeMethods.NoError) {
Console.WriteLine ("Can't get 'ProductName' for {0}", productCode);
}
Console.WriteLine ("ProductCode: {0}{3}ProductName:'{1}'{3}ProductVersion:'{2}'{3}",
productCode, sbProductName, sbProductVersion, Environment.NewLine);
}
}
}
}
which produce on my computer the correct output
ProductCode: {90140000-001A-0407-0000-0000000FF1CE}
ProductName:'Microsoft Office Outlook MUI (German) 2010'
ProductVersion:'14.0.4763.1000'
ProductCode: {90140000-001A-0419-0000-0000000FF1CE}
ProductName:'Microsoft Office Outlook MUI (Russian) 2010'
ProductVersion:'14.0.4763.1000'
instead of errors in the ProductVersion before.