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Language
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Description
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C/C++
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BOOL UsbGetInterfaceDescriptor(IN USB_DEVICE_HANDLE hUsb,
| OUT PUSB_INTERFACE_DESCRIPTOR* pIntDescr);
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Delphi
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function UsbGetInterfaceDescriptor(hUsb : USB_DEVICE_HANDLE;
Index : UCHAR;
AltIndex : UCHAR;
var pIntDescr : PUSB_INTERFACE_DESCRIPTOR) : BOOL; stdcall;
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VB
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Function UsbGetInterfaceDescriptor (ByVal hUsb As Long, _
ByVal MainIndex As Byte, _
ByVal AlternateIndex As Byte, _
ByRef pDesc As Long) As Boolean
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Parameters
| Specifies handle to USB device.
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| Number of alternate setting.
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| Pointer to retrieved interface descriptor.
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Return Value
| If function fails it return FALSE. To detect error call GetLastError function.
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Description
| Use this function to retrieve interface descriptor. This function can be used only after getting valid handle from OpenRapidUsb function. Do not forget to free descriptor after use with UsbFreeInterfaceDescriptor.
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Example
// open first RapidUSB device
USB_HANDLE hUsb = OpenRapidUsb(0);
PUSB_INTERFACE_DESCRIPTOR pIntDesc;
UsbGetInterfaceDescriptor(hUsb, 0, 0, pIntDesc);
if (pIntDesc != NULL)
{
// interface retrieved successfully
// Free descriptor when it is not needed
UsbFreeInterfaceDescriptor(pIntDesc);
}
else
{
// Error! Check if hUsb is valid
}
CloseRapidUsb(hUsb);
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