Home		Prev Next
Contents Programming For USB Device Overview Programmers Guide Scenario Data transfer Synchronous Transfer Asynchronous Transfer Reading Descriptors USB Support Routines And Structures Common Procedures UsbEnumerateDevices OpenRapidUsb IsRapidUsbOpened CloseRapidUsb Descriptors UsbGetDescriptor UsbGetDeviceDescriptor UsbGetStringDescriptor UsbGetConfigDescriptor UsbFreeConfigDescriptor UsbGetInterfaceDescriptor UsbFreeInterfaceDescriptor UsbGetEndpointDescriptor Configure Device UsbGetDeviceInfo UsbUnconfigureDevice UsbSelectConfig UsbGetConfig UsbSelectInterface UsbGetInterface UsbResetDevice UsbGetBandwidthInfo UsbCyclePort Features and Status UsbSetFeature UsbClearFeature UsbGetStatus Vendor/Class Requests UsbVendorRequestIn UsbVendorRequestOut UsbClassRequestIn UsbClassRequestOut Pipes IsRapidUsbPipeOpened UsbPipeOpen UsbPipeClose UsbGetPipeCount UsbPipeGetInfo UsbPipeDirectionIn UsbPipeGetType UsbTransfer UsbTransferAsync TRANSFER_COMPLETION_ROUTINE UsbCancelTransfer UsbPipeReset UsbPipeAbort Other UsbGetPortStatus UsbGetCurrentFrameNumber USB Structures and Types RDUSB_DEVICE_INFORMATION RDUSB_PIPE_INFORMATION RDUSB_PIPE_TYPE RDUSB_BANDWIDTH_INFORMATION		Scenario Go to RapidDriver Main Page Before using any of the functions of RapidUSB interface DLL must be intinalized with call to UsbEnumerateDevices. After this friver can be requested to open handle of one of the devices enumerated during call to UsbEnumerateDevices. This is done with the help of the function OpenRapidUSB. It must be done once after starting the application. Also resources used by the driver should be cleaned up (CloseRapidUsb) before the application is closed. Schematic session of using RapidUSB: // find RapidUSB devices   nDevices = UsbEnumerateDevices();   if ( nDevices < 1 )   {   // no RapidUSB devices present in system   MessageBox("Cannot find any RapidUSB device!","Attention!", MB_OK | MB_ICONWARNING);      return;   }   // initialize(open) the driver   hUSB =  OpenRapidUSB( 0 );    // Check if the driver initialized successfully   if ( IsRapidUSBOpened(hUSB)) {         ...    //////////////////////////////////////   /////////  RapidUSB session //////////   /////////  ................ //////////   //////////////////////////////////////   // Free resources used by the driver (close the driver)            hUSB = CloseRapidUSB(hUSB);    }   else     {   // An error happened while opening the driver   MessageBox("Cannot open the driver","Attention!", MB_OK | MB_ICONWARNING);      }   Driver can be initialized by many applications simultaneously. The parameter of OpenRapidUSB() can be used to select a device supported by RapidUSB driver.