New Control Panel Applet

Hey there...

Recently I have been looking into creating new Control Panel applets in C.

I got this link from Msdn: Msdn Shell Stuff which seemed very helpful and tried to use their sample code. This however did not work...
I simplified their code to this, which still has a problem:

Code:

---

#include <cpl.h>

BOOL WINAPI CALLBACK __declspec(dllexport) CPlApplet(HWND hwnd,UINT Msg,LONG lParam1,LONG lParam2)
{
  CPLINFO * cp;
  switch(Msg) {
      case CPL_INIT:
        //no memory to set, so do nothing...
        return TRUE;
      case CPL_GETCOUNT:
        return 1;    //only one subprogram...
      case CPL_INQUIRE:
        cp = (CPLINFO*)lParam2;
        cp->idIcon = IDMAINICON;
        cp->idName = IDNAME;
        cp->idInfo = IDDESCR;
        cp->lData  = 0;
        return 0;
      case CPL_DBLCLK:
        MessageBox(hwnd,"The message was correctly processed?","status",0);
        break;
  }
  return FALSE;
}

---

The problem is that when called from the Control Panel as it supposed to be, Explorer crashes. hmmm. Don't know why?
Using Messageboxes, saw that CPL_INIT was called, and that the crash was just after. There were no error logs, and I don't know how to track this down further.

The dll file generated had CPlApplet as entry-point, as I think it was supposed to...

Thanks for your time and trouble.

Quote:

---

CPL_NEWINQUIRE Message

If the CPlApplet function processes this message successfully, it should return zero.

---

Assumably, if you don't handle this message you should return non-zero. If that is the case, the MSDN sample is wrong.

Then again, with this bit of inspired code, I wouldn't be too surprised.

Code:

---

HWND hwndCPL;      // handle to Control Panel window
UINT uMsg;        // message
LPARAM lParam1;    // first message parameter
LPARAM lParam2;    // second message parameter

LONG CALLBACK CPlApplet(hwndCPL, uMsg, lParam1, lParam2)
{
    int i;
    LPCPLINFO lpCPlInfo;
...

---