C＃WriteFile的（），无法写入USB HID设备

问题描述

我是相当新的C＃以及Windows编程，我试图建立通信之间的USB HID设备。我得到了成功的设备路径使用SetupDiGetDevicexxxxxx和使用的CreateFile（）来获得处理。 。下面是我的代码

 公共常量UINT FILE_SHARE_READ = 00000001; 
公共常量UINT FILE_SHARE_WRITE = 0x00000002; 
公共const int的OPEN_EXISTING = 3; 
公共常量UINT GENERIC_READ = 0x80000000的; 
公共常量UINT GENERIC_WRITE = 0x40000000之后; 
的CreateFile（串的DevicePath）
 {
 HidHandle =的CreateFile（DevicePath中，GENERIC_READ | GENERIC_WRITE，FILE_SHARE_READ | FILE_SHARE_WRITE，0，OPEN_EXISTING，0，0）; 
} 
  

获取设备句柄信息，我如下调用写文件功能后。

 结果= WriteFile的（HidHandle，outputReportBuffer []，outputReportBuffer.Length，NumberOfBytesWritten，0）; 
  

OutputBuffer中是一个长度为8，出于某种原因的字节数组，我是不是能够写入USB HID设备。 结果始终为零。任何帮助表示赞赏。此外，任何一个可以告诉我如何验证 HidHandle 是有效与否。当我跑我正在为1124的节目

我也跟着上这类问题以前的帖子：的无法顺利沟通，但没有帮助。

下面是创建文件和WriteFile两个贪利。

 函数[DllImport（KERNEL32.DLL，SetLastError = TRUE）] 
私人静态外部INT的CreateFile（字符串lpFileName的对象，UINT dwDesiredAccess，UINT dwShareMode，UINT lpSecurityAttributes，UINT CREATE_NEW标志，UINT dwFlagsAndAttributes，UINT hTemplateFile）; 
 
函数[DllImport（KERNEL32.DLL）] 
静态公网的extern BOOL WriteFile的（INT HFILE，字节lpBuffer，诠释nNumberOfBytesToWrite，诠释lpNumberOfBytesWritten，诠释lpOverlapped的）
  

解决方案

您可能会需要使用USB库，像的

I am fairly new to C# as well as windows programming and I am attempting to establish communication between a USB HID device. I got the device path successfully using 'SetupDiGetDevicexxxxxx' and used 'CreateFile()' to get Handle. Below is my code.

public const uint FILE_SHARE_READ = 0x00000001;
public const uint FILE_SHARE_WRITE = 0x00000002;
public const int OPEN_EXISTING = 3;
public const uint GENERIC_READ = 0x80000000;
public const uint GENERIC_WRITE = 0x40000000;
CreateFile(string Devicepath)
{
    HidHandle = CreateFile(Devicepath, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ | FILE_SHARE_WRITE, 0, OPEN_EXISTING, 0, 0);
}

After obtaining Device handle info, I am calling write file functions as below.

Result = WriteFile(HidHandle, outputReportBuffer[], outputReportBuffer.Length, NumberOfBytesWritten, 0);

Outputbuffer is the byte array of length 8. For some reason, I was not able to write to USB HID device. "Result" is always zero. Any Help is appreciated. Also, can any one tell me how to verify that HidHandle is a valid or not. When I run the program I am getting it as "1124".

I did followed previous post on this type of question: Cannot communicate successfully with USB HID device using writefile(), but no help.

Below are the two menthods for create file and writefile.

[DllImport("kernel32.dll", SetLastError = true)]
private static extern int CreateFile(string lpFileName, uint dwDesiredAccess, uint dwShareMode, uint lpSecurityAttributes, uint dwCreationDisposition, uint dwFlagsAndAttributes, uint hTemplateFile );

[DllImport("kernel32.dll")]
static public extern bool WriteFile(int hFile,  byte lpBuffer, int nNumberOfBytesToWrite,  int lpNumberOfBytesWritten, int lpOverlapped)

解决方案

You'll probably have to use a USB library, like this one

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