Question

[StructLayout(LayoutKind.Sequential)]
public struct MEASURE_VALUE
{
    public byte byDataInfo;
    public byte byJudge;
    public byte byTimZero;
    public float fValue;
}

[StructLayout(LayoutKind.Sequential)]
public struct MEASURE_DATA
{
    public byte byYear;
    public byte byMonth;
    public byte byDay;
    public byte byHour;
    public byte byMinute;
    public byte bySecond;
    public byte byMillsecond;
    public uint dwPulseCnt;
    public byte byTotalJudge;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
    public MEASURE_VALUE[] stMesureValue;
}

MEASURE_DATA stMeasureData = new MEASURE_DATA();
int rc = NativeMethods.GetMeasurementValue(ref stMeasureData);

我正在尝试在Pyton中使用带有ctypes的DLL。我想用这个库访问以太网端口并从那里获取数据。如上所述，我在C＃中有例子。我用C＃获得的数据是正确的，但我用Python得到的数据是错误的。当我进行各种更改时，我在Python中获得的数据在正常数据更改时不会改变。

c＃：12.4359，-10000000000，-10000000000，-10000000000 ......

Python：7.174648137343064e-43,8.401298464324817e-45,1.401298464324817e-45,1.401298464324817e-45 ...

class MEASURE_VALUE(ctypes.Structure):
    _fields_ = [
        ("byDataInfo", ctypes.c_ubyte),
        ("byJudge", ctypes.c_ubyte),
        ("byTimZero", ctypes.c_ubyte),
        ("fValue", ctypes.c_float)
    ] 

class MEASURE_DATA(ctypes.Structure):
    _fields_ = [
        ("byYear", ctypes.c_ubyte),
        ("byMonth", ctypes.c_ubyte),
        ("byDay", ctypes.c_ubyte),
        ("byHour", ctypes.c_ubyte),
        ("byMinute", ctypes.c_ubyte),
        ("bySecond", ctypes.c_ubyte),
        ("byMillsecond", ctypes.c_ubyte),
        ("dwPulseCnt", ctypes.c_ushort),
        ("byTotalJudge", ctypes.c_ubyte),
        ("stMesureValue", MEASURE_VALUE*16)
    ]

lib = ctypes.windll.LoadLibrary("LSIF.dll")
measureData = MEASURE_DATA()
result = lib.GetMeasurementValue(ctypes.byref(measureData))

你能帮我找出我弄错的地方吗？

在python中使用带有ctypes的dll

0 个答案: