SendMessageTimeout not working

[crohan]

Good day all,

I have a problem, but I am not sure exactly when it started to manifest.

For years our installer made environment variables by creating the keys and then calling SendMessageTimeout(...), and it worked fine.

However, I discovered today that the SendMessageTimeout call seems to either (a) fail silently or (b) not have an effect.

Here is what I have:

#define WM_SETTINGCHANGE          0x001A
#define HWND_BROADCAST            0xffff
#define SMTO_ABORTIFHUNG          0x0002

prototype BOOL USER.SendMessageTimeout(HWND, INT, INT, POINTER, INT, INT, POINTER);

function RefreshEnvironment()
      STRING      sParam;
      POINTER     pParam, pResult;
      LONG        lResult;

begin
      sParam      = "Environment";
      pParam      = &sParam;
      pResult     = &lResult;

      if (!SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, pParam, SMTO_ABORTIFHUNG, 500, pResult))
      then
          BATCH_INSTALL = TRUE;
      endif;
end;

The problem is that after the install finishes the environment is not updated, and a reboot is not triggered :confused:

Any ideas?

[crohan]

Solved it now by using SendMessageTimeoutA. I guess IS was calling the Unicode version, and I suspect my string parameter was not correct.

The other option (need to verify) is to declare sParam as WSTRING.