The HKEY_LOCAL_MACHINE\Drivers\PCMCIA\Detect key contains numbered subkeys that the Device Manager uses when trying to auto-detect PC Cards. Each subkey specifies a device driver DLL and a corresponding detection function that the Device Driver uses to determine if the driver can recognize the inserted PC Card. These detection functions are only invoked when a PC Card has no Plug-and-Play ID, or when there is no subkey under the Drivers\PCMCIA\ key corresponding to the card's Plug-and-Play ID.
The subkeys under Detect are two digit integers that determine the order the Device Manager uses to try detection functions. The Device Manager stops trying detection functions when one of them returns a value indicating a successful detection. For example, the DLL listed in the subkey "20" would be tried after the one listed in the subkey "19", provided that no suitable driver had yet been found. This subkey integer is arbitrary and is typically assigned by an installable device driver's installation routine. The two values within these subkeys are described in this table.
| Value name | Value type | Description |
|---|---|---|
| Dll | REG_SZ | Specifies the filename for the DLL that contains the detection function. Device Manager will load the DLL in order to call the detection function. |
| Entry | REG_SZ | Specifies the name of the detection function. |
The following example shows an entry for detecting SRAM PC Cards.
HKEY_LOCAL_MACHINE [Drivers] [PCMCIA] [Detect] [20] SZ: Entry = DetectRAMCard SZ: Dll = RAMCARD.dll