RETERR DiCallClassInstaller(DI_FUNCTIONS diFctn, LPDEVICE_INFO lpdi)
 Call the appropriate class installer with the specifed installer function.
| DIF_SELECTDEVICE | Select a driver to be installed for the device. | 
| DIF_INSTALLDEVICE | Install the driver for the device. | 
| DIF_PROPERTIES | Display a properties dialog for the device. | 
| DIF_REMOVE | Remove the device. | 
| DIF_FIRSTTIMESETUP | Perform first time setup initialization. This message is sent during the first boot of Windows 95 and contains only class information. | 
| DIF_SELECTCLASSDRIVERS | Select drivers for all devices of the class specified by the lpdi. | 
| DIF_VALIDATECLASSDRIVERS | Ensure all devices of the class specified by the lpdi are ready to be installed. | 
| DIF_INSTALLCLASSDRIVERS | Install drivers for all devices of the class specified by the lpdi. | 
| DIF_CALCDISKSPACE | Compute the amount of disk space required by drivers for the device. | 
| DIF_DESTROYPRIVATEDATA | Destroy any private date referenced by the lpdi->dwClassInstallReserved. | 
| DIF_MOVEDEVICE | The device is being moved to a new location in HKLM\ENUM. | 
| DIF_DETECT | Detect any devices of class specificed by the lpdi. | 
| DIF_INSTALLWIZARD | Add any pages necessary to the New Device Wizard for the class specified by the lpdi. | 
| DIF_DESTROYWIZARDDATA | Destroy any private data allocated due to a DIF_INSTALLWIZARD message. | 
| DIF_PROPERTYCHANGE | The device's properties are changing. The device is being enabled, disabled, or has had a resource change. | 
| DIF_DETECTVERIFY | The class installer should verify any devices it previously detected. Non verified devices should be removed. | 
| DIF_INSTALLDEVICEFILES | The class installer should only install the driver files for the selected device. | 
This function will attempt to load and call the class installer for the class listed in the lpdi->szClassName field. If there is no class installer, or the class installer returns ERR_DI_DO_DEFAULT, then this function will call a default procedure for the specified class installer function.