HOWTO: Speed Up Load Time of OLE Controls

• The Microsoft Foundation Classes (MFC), included with:
  • Microsoft Visual C++, 32-bit Editions, version 4.0

SUMMARY

When bringing up a dialog template that contains one or more OLE Controls, the delay can be significant depending on the speed of the computer. You can use the AfxOleLockControl() function to speed up the loading of the dialog by preloading the control in the application.

MORE INFORMATION

You can load the OLE Control into the address space of the executable at any time by using the AfxOleLockControl() function. There are two versions of this function, one that takes a class id (CLSID) and one that takes a program id (ProgID).

You can unload the control at any time by calling AfxOleUnlockControl() or AfxOleUnlockAllControls(). There are two versions of AfxOleUnlockControl(), one takes a class id and the other taking a program id.

If a splash screen is used by the application, that might be a good time to load the controls. It can be done at any point after the call to AfxEnableControlContainer() in the CWinApp::InitInstance(), and the loaded controls can then be unloaded at any time.

REFERENCES

These functions were not documented in Visual C++ 4.0 Help. You can find the source code for these functions in Occlock.cpp in the \Msdev\Mfc\Src subdirectory.

Additional query words:

Keywords : kbole kbprg kbCtrl kbMFC kbVC
Version : 4.0
Platform : NT WINDOWS
Issue type : kbhowto