- HOW TO CREATE ZERO BYTE FILE MSJAVA DLL DRIVER
- HOW TO CREATE ZERO BYTE FILE MSJAVA DLL SOFTWARE
- HOW TO CREATE ZERO BYTE FILE MSJAVA DLL CODE
If(RecvLength=4 & receive_buf = READ_VERSION & receive_buf = 0x02) Send_buf = 0x02 // expected length of return value MyInPipe = MPUSBOpen(current_instance,vid_pid,in_pipe,MP_READ,0) MyOutPipe = MPUSBOpen(current_instance,vid_pid,out_pipe,MP_WRITE,0) Printf("Failed to open data pipes.\n\r") If(myOutPipe = INVALID_HANDLE_VALUE || myInPipe = INVALID_HANDLE_VALUE)
MyInPipe = MPUSBOpen(selection,vid_pid,in_pipe,MP_READ,0) MyOutPipe = MPUSBOpen(selection,vid_pid,out_pipe,MP_WRITE,0) Printf("\n\r%d device(s) with %s currently attached\n\r",max_count,vid_pid) (MPUSBClose = NULL) || (MPUSBGetDLLVersion = NULL) ||Įlse printf("GetProcAddress => Success \n\r") ĭWORD max_count = MPUSBGetDeviceCount(vid_pid) (MPUSBWrite = NULL) || (MPUSBRead = NULL) || If((MPUSBGetDeviceCount = NULL) || (MPUSBOpen = NULL) || MPUSBClose=(BOOL(*)(HANDLE))GetProcAddress(libHandle,"_MPUSBClose") GetProcAddress(libHandle,"_MPUSBReadInt") MPUSBReadInt=(DWORD(*)(HANDLE,PVOID,DWORD,PDWORD,DWORD))\ MPUSBRead=(DWORD(*)(HANDLE,PVOID,DWORD,PDWORD,DWORD))\ MPUSBWrite=(DWORD(*)(HANDLE,PVOID,DWORD,PDWORD,DWORD))\ MPUSBOpen=(HANDLE(*)(DWORD,PCHAR,PCHAR,DWORD,DWORD))\ GetProcAddress(libHandle,"_MPUSBGetDeviceCount") GetProcAddress(libHandle,"_MPUSBGetDLLVersion") If (libHandle != NULL) FreeLibrary(libHandle) If (myInPipe != INVALID_HANDLE_VALUE) MPUSBClose(myInPipe) If (myOutPipe != INVALID_HANDLE_VALUE) MPUSBClose(myOutPipe) Printf(" Set new Instance: %d\n\r",current_instance) Printf(" Read Temp Value: %0.1f%cC\n\r",temp_val,0xF8) Printf(" Read Pot Value: %0.1f%%\n\r",pot_val) Printf(" Get USB Demo Firmware Version\n\r") Printf("Device Count => %d \n\n\r",MPUSBGetDeviceCount(vid_pid)) Printf("DLL Version => %X.%04X \n\r",HIWORD(temp),LOWORD(temp)) Printf("The VID/PID being tested => %s \n\r",vid_pid) MyOutPipe = myInPipe = INVALID_HANDLE_VALUE Printf("PICDEM FS USB Connection Demo \n\r") Protoypes -ĭWORD SendReceivePacket(BYTE *SendData, DWORD SendLength, BYTE *ReceiveData, DWORD *ReceiveLength, UINT SendDelay, UINT ReceiveDelay)
HOW TO CREATE ZERO BYTE FILE MSJAVA DLL DRIVER
June18.cpp : Defines the entry point for the console application.Ĭhar vid_pid= "vid_04d8&pid_000c" // MCHPUSB - Generic Driver vid_pid This code requests and displays the Firmware version number, the Pot value and the temp sensor (U4) value. It connects to the PICDEM FS USB board with the "USB Device - MCHPUSB - Generic Driver - C18 - PICDEM FSUSB.hex" firmware installed.
HOW TO CREATE ZERO BYTE FILE MSJAVA DLL CODE
The code was complied with VC++ 2008 Express Edition. I'll post my demo code below in case it will help anyone in the future. Thanks for your help pk_volt, I was able to send & receive data with the PICDEM. If((MPUSBGetDLLVersion=NULL)||(MPUSBGetDeviceCount=NULL)) printf("GetProcAddress Error\r\n") MPUSBGetDeviceCount=(DWORD(*)(PCHAR))GetProcAddress(libHandle,"_MPUSBGetDeviceCount") MPUSBGetDLLVersion=(DWORD(*)(void))GetProcAddress(libHandle,"_MPUSBGetDLLVersion") LibHandle = LoadLibrary(_T("mpusbapi.dll")) I tried variations to see if caps were an issue with the vid/pid but that didn't seem to make any difference.
However the Device Count always displays 0 even though in Device Manager I see that there is a device with "vid_10c4&pid_81ab " connected. For a while I couldn't figure out why it was returning 0x10000 then realized that it was finding an old version in C:\WINDOWS\system32.
HOW TO CREATE ZERO BYTE FILE MSJAVA DLL SOFTWARE
When I run the program, it correctly returns the software version of mpusbapi as 0x10100. The code below is based mainly on Microchip's Run-Time Linking example. I'm VERY new to VC++ so please bear with me. Hello, I'm trying to use the mpusbapi.dll in Visual C++ 2008 Express (VC9) and running into some problems.
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