USB Midi系统独占消息无法识别

您好，USB MIDI系统独家消息“0xF0”不承认。我已经创建了一个USB MIDI控制器使用一个18F45 50 PIC连同VB Visual Studio 2010纲要。它的工作原理很好，我可以通过使用状态字节命令0x8、0x9、0xa、0xb、0xc、0xd、0xe、0xf1、0xf2、0xf2、0xf4、0xf4、0xf5、0xf6来发送和接收这两种方式。这些都是短消息（4字节），但我想能够发送长消息（64字节），状态命令启动长消息是0xF0，然后是数据和0xf7，0xf0没有被识别，我认为是我的VB程序错了，但这不是因为我已经尝试了它的机智。HMIDIOX和报告“错误格式”，我用MIDI监视器试过，没有工作。USB分析器上显示的数据是正确的。因此，必须是18F45 50的数据，这是问题所在，尽管所有其他状态字节都可以正常工作。我已经看到一些关于0xF0的“0”（零）是空的或关于Unicode的，但是不能解决这个问题。尝试发送十六进制、二进制、十进制和文本。有人有什么想法吗？谢谢你的帮助，戴维。



      以下为原文

    Hi,
USB Midi System Exclusive Message "0xF0" not recognized.
I have created a USB Midi Controller using a 18F4550 pic together with a VB Visual Studio 2010 Programme. Most of it works fine I can send and receive both ways by using the Status byte commands 0x8, 0x9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6,.   These are all Short Messages ( 4 bytes) but I want to be able to send Long messages ( 64 Bytes ) the status Command to start a Long message is 0xF0 then the Data and 0xF7 at the end.
The 0xF0 is not recognized, I thought it was my VB programme that was wrong but it is not because I have tried it with MidiOX and that reports "wrong format", I tried it with a Midi monitor and did not work. The data shown on a USB Analyser is correct.   So it must be the data from the 18F4550 that is the problem, although all the other Status bytes work ok. I have seen some talk about the "0" (zero) of 0xF0 being Null or about Unicode but cannot solve this. Have tried sending Hex, Binary, Decimal and Text.

Does anyone have any ideas? Thank you for any help.

David