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Language
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Description
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C/C++
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BOOL UsbClassRequestOut(IN USB_DEVICE_HANDLE hUsb,
| IN RDUSB_REQUEST_RECIPIENT RequestRecipient,
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| IN DWORD nNumberOfBytesToTransfer,
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| OUT LPDWORD lpNumberOfBytesTransfered);
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Delphi
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function UsbClassRequestOut(hUsb : USB_DEVICE_HANDLE;
RequestRecipient : RDUSB_REQUEST_RECIPIENT;
ReservedBits : UCHAR;
Request : UCHAR;
Value : USHORT;
Index : USHORT;
const Buffer : LPVOID;
nNumberOfBytesToTransfer : DWORD;
var lpNumberOfBytesTransfered : DWORD): BOOL; stdcall;
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VB
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Function UsbClassRequestOut (ByVal hUsb As Long, _
ByVal RequestRecipient As Byte, _
ByVal ReservedBits As Byte, _
ByVal Request As Byte, _
ByVal Value As Integer, _
ByVal Index As Integer, _
ByRef Buffer As Any, _
ByVal NumberOfBytesToTransfer As Long, _
ByRef NumberOfBytesTransfered As Long) As Boolean
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Parameters
| Specifies Device handle. This handle can be obtained with OpenRapidUsb.
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| Specifies recipient of feature request.
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| Specifies a value, from 4 to 31 inclusive, that becomes part of the request type code in the USB-defined setup packet. This value is defined by USB for a class request..
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| Specifies USB-defined request code for the RequestRecipient.
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| Specifies a value, specific to Request, that becomes part of the USB-defined setup packet for the RequestRecipient. This value is defined by the creator of the code used in Request.
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| Specifies the device-defined index, returned by a successful configuration request, if the request is for an endpoint or interface. Otherwise, Index must be zero.
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| Pointer to buffer for the transfer. This buffer contains user-supplied data for transfer to the device.
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| Specifies the length, in bytes, of the buffer specified in lpBuffer.
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| lpNumberOfBytesTransfered
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| UsbClassRequestOut returns the number of bytes sent to device in this parameter.
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Return Value
| If function fails it return FALSE. To detect error call GetLastError function.
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Description
| UsbClassRequestOut is called to issue a class-specific command to a device, interface, endpoint or other device-defined target. Transfer direction is from host to device (OUT).
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