UsbOpen: Difference between revisions
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==Parameters== | ==Parameters== | ||
; pHandle : | ; pHandle : the address of the variable to receive the Device Handle. | ||
; usVendor : the Vendor Identifier (VendorID) from the device descriptor. | ; usVendor : the Vendor Identifier (VendorID) from the device descriptor. | ||
Revision as of 16:54, 30 January 2017
Description
Acquires access to a specific USB device.
Syntax
ulrc = UsbOpen(pHandle,usVendor,usProduct,usBCDDevice,usEnumDevice)
Parameters
- pHandle
- the address of the variable to receive the Device Handle.
- usVendor
- the Vendor Identifier (VendorID) from the device descriptor.
- usProduct
- the Product Identifier (ProductID) from the device descriptor.
- usBCDDevice
- the Device Release Number from the device descriptor.
- usEnumDevice
- 0 to accept any specified device or N for the Nth device.
Return Code
0x0000 - NO_ERROR
Errors
0x0057 - ERROR_INVALID_PARAMETER 0x1B58 - USB_NOT_INIT 0xFF0C - ERROR_I24_GEN_FAILURE 0xFF13 - ERROR_I24_INVALID_PARAMETER
Remarks
Example Code
//Code Snippet - UsbOpen
{
APIRET ulrc;
PUSBHANDLE pHandle;
USBHANDLE Handle;
USHORT usVendor = 0x046D;
USHORT usProduct = 0x0804;
USHORT usBCDDevice = 0x0009;
USHORT usEnumDevice = 0;
pHandle = &Handle;
ulrc = UsbOpen(pHandle,usVendor,usProduct,usBCDDevice,usEnumDevice);
printf("\nUsbOpen - ulrc: 0x%04X",ulrc);
}