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AN3224 датащи(PDF) 18 Page - STMicroelectronics |
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AN3224 датащи(HTML) 18 Page - STMicroelectronics |
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18 / 49 page ![]() PR101-USB and MR101-USB reader detection AN3224 18/49 Doc ID 17559 Rev 2 4.1.5 FEUSB_OpenDevice FEUSB_OpenDevice Visual Basic prototype Table 9 illustrates the FEUSB_OpenDevice Visual Basic function. FEUSB_OpenDevice C/C++ prototype Table 10 illustrates the FEUSB_OpenDevice C/C++ function. Table 9. FEUSB_OpenDevice Visual Basic function Function description Declaration Public Declare Function FEUSB_OpenDevice Lib "FEUSB.DLL" (ByVal dwDeviceID As Long) As Long Prototype iHandle = FEUSB_OpenDevice(lngDeviceId(i)) Parameters dwDeviceID: The reader is detected by calling FEUSB_Scan. The FEUSB_GetScanListPara allows retrieving the value of the strDeviceHnd parameter that is converted in Long to obtain dwDeviceID. Returned value iHandle: USB reader handle for FEUSB functions Otherwise FEUSB Error code Table 10. FEUSB_OpenDevice C/C++ function Function description Declaration int DLL_EXT_FUNC FEUSB_OpenDevice( long nDeviceID ); Prototype iDeviceHandle = FEUSB_OpenDevice(dwDeviceSerialNumber); Parameters dwDeviceID: The reader is detected by calling FEUSB_Scan. The FEUSB_GetScanListPara allows retrieving the value of the strDeviceHnd parameter that is converted in Long to obtain dwDeviceID. Returned value iHandle: USB reader handle for FEUSB functions Otherwise FEUSB Error code |
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