Question

我有这样的结构：

public struct SERVER_DF_PARAMETERS

    {
        public bool bRunState;          
        public bool bWideband;          
        public double dFrequencyRF;
        public double dFrequencyStartScan;
        public double dFrequencyStopScan;

        public double dBandwidthIF;     
        public double dBandwidthDF; 

        public bool bNormalModeDF;      
        public double dThresholdLevelDF;
        public double dThresholdQualityDF;
        public int iAverageTimeDF;      

        public bool bPreAmplifierRF;
        public bool bLongAntennaRF;
        public int iTunerModeRF;
        public int iGainRF; 

        public bool bAutoGainIF;        
        public int iManualGainIF;
        public int iAutoGainCtrlTime;   
        public double dMaxGainAgc;      
        public bool bAFC;
        public bool bVoiceState;        //true -> On , false -> off
        public bool bSquelchState;      //true -> On , false -> off
        public bool bStateDenoising;    //true -> On , false -> off
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 8)]
        public String strDemodulation;  //AM,FM,SSB,CW,...
        public double dBandwidthVoice;  //in KHz
        public int iBeatFreqOffset; //in Hz (BFO)
        public double dGainVoice;           //int dBm

        public bool bClassifier;        //true -> Run , false -> Stop
        public int iTimeHistoryCL;      //in millisecond


    };

但是当程序运行时，字段的顺序更改为此（所有布尔值都在顶部，依此类推）：

    (I added to watch to see its value )


    bAFC    false   bool
    bAutoGainIF false   bool
    bClassifier false   bool
    bLongAntennaRF  false   bool
    bNormalModeDF   true    bool
    bPreAmplifierRF false   bool
    bRunState   true    bool
    bSquelchState   false   bool
    bStateDenoising false   bool
    bVoiceState false   bool
    bWideband   false   bool
    dBandwidthDF    20.0    double
    dBandwidthIF    20.0    double
    dBandwidthVoice 100.0   double
    dFrequencyRF    100.0   double
    dFrequencyStartScan 100.0   double
    dFrequencyStopScan  200.0   double
    dGainVoice  1.0 double
    dMaxGainAgc -30.0   double
    dThresholdLevelDF   -130.0  double
    dThresholdQualityDF 50.0    double
    iAutoGainCtrlTime   1000    int
    iAverageTimeDF  1000    int
    iBeatFreqOffset 0   int
    iGainRF 0   int
    iManualGainIF   0   int
    iTimeHistoryCL  1000    int
    iTunerModeRF    0   int
    strDemodulation "FM"    string

问题是当我想使用套接字将此结构发送到服务器时，服务器使用c ++并提供此结构的字节。所以字段的顺序不应该改变。

Answer 1

把

[StructLayout(LayoutKind.Sequential, Pack=1)]

之前

public struct SERVER_DF_PARAMETERS

强制编译器按照定义中列出的顺序分配结构，这是它默认执行的操作。如果指定 Pack = 1 ，则结构将被组织，以便每个字段位于字节边界，并且可以一次读取一个字节 - 即不需要打包

有关更多说明，请参阅Mastering C# structs ^^

Answer 2

您可以使用[StructureLayout]属性：

参考是here。

c＃更改结构中字段的顺序

2 个答案: