C# 调用api 问题

2011-02-18 04:53:17 135 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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关于C#窗体应用程序调用google翻译api的问题 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Net; using System.IO; using TranslationAPI; using JSONUtil; namespace DrawToolsLib { class HandWhiteTarans { /// <summa 阅读详情

c#通过调用api访问usb设备
其中调用DeviceIoControl函数时总是返回错误号87，意味着参数错误，请问是什么问题呢？谢谢，代码如下
[DllImport("Kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool DeviceIoControl(
IntPtr hDevice,
uint dwIoControlCode,
ref long InBuffer,
int nInBufferSize,
ref long OutBuffer,
int nOutBufferSize,
ref int pBytesReturned,
ref NativeOverlapped lpOverlapped);

private long ResetPort(IntPtr hDevice)
{
int outByte = 0;
System.Threading.NativeOverlapped overlapped = new System.Threading.NativeOverlapped();

overlapped.InternalLow = IntPtr.Zero;
overlapped.InternalHigh = IntPtr.Zero;
overlapped.OffsetLow = 0;
overlapped.OffsetHigh = 0;
overlapped.EventHandle = CreateEvent(IntPtr.Zero, true, false, null);

long inbuffer = 0;
DeviceIoControl(hDevice, IOCTL_SCSI_PASS_THROUGH_DIRECT, ref inbuffer, 0, ref inbuffer, 0, ref outByte, ref overlapped);

return Marshal.GetLastWin32Error() ;
}

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