调用原生 dll 失败

Question

尝试使用命令dll(c++)项目到c#
结构dll

typedef struct {
SSP_FULL_KEY Key;
unsigned long BaudRate;
unsigned long Timeout;
unsigned char PortNumber;
unsigned char SSPAddress;
unsigned char RetryLevel;
unsigned char EncryptionStatus;
unsigned char CommandDataLength;
unsigned char CommandData [255];
unsigned char ResponseStatus;
unsigned char ResponseDataLength;
unsigned char ResponseData [255];
unsigned char IgnoreError;
} SSP_COMMAND;

typedef struct {
unsigned __int64 FixedKey;
unsigned __int64 EncryptKey;
} SSP_FULL_KEY;

这是我打开的代码

public struct SSP_FULL_KEY
    {
        long FixedKey;
        long EncryptKey;
        public SSP_FULL_KEY (long fix, long encr)
        {
            FixedKey = fix;
            EncryptKey = encr;
        }

    }
    public struct SSP_COMMAND
    {
        / / String PortNumber;
        SSP_FULL_KEY key;
        long BaudRate; / / baud rate of the packet
        long Timeout; / / how long in ms to wait for a reply from the slave
        string PortNumber; / / the serial com port number of the host
        string SSPAddress; / / the SSP address of the slave
        string RetryLevel; / / how many retries to the slave for non-response
        string EncryptionStatus; / / is this an encrypted command 0 - No, 1 - Yes
        string CommandDataLength; / / Number of bytes in the command
        string [] CommandData; / / Array containing the command bytes
        string ResponseStatus; / / Response Status (PORT_STATUS enum)
        string ResponseDataLength; / / how many bytes in the response
        string [] ResponseData; / / an array of response data
        string IgnoreError; / / flag to suppress error box (0 - display, 1 - suppress)

        public SSP_COMMAND (string comport)
        {
            BaudRate = 9600;
            Timeout = 500;
            PortNumber = comport;
            RetryLevel = "5";
            IgnoreError = "0";
            EncryptionStatus = "0";
            CommandData = new string [255];
            ResponseData = new string [255];
            ResponseStatus = "0";
            ResponseDataLength = "0";
            SSPAddress = "0";
            CommandDataLength = "0";
            key = new SSP_FULL_KEY (0123456701234567, 0123456701234567);

        }
    }

    class Program
    {

        / / [DllImport ("ITLSSPProc.dll")]
        / / Private static extern int OpenSSPComPort (IntPtr smd);

        [DllImport ("ITLSSPProc.dll")]

        private static extern int OpenSSPComPort (SSP_COMMAND cmd);

        static void Main (string [] args)
        {
            SSP_COMMAND cmd = new SSP_COMMAND ("6");
            / * IntPtr.BaudRate = 9600;
            IntPtr.PortName = "COM0";
            IntPtr.Parity = Parity.None;
            IntPtr.StopBits = StopBits.One;

            * /
            Console.WriteLine (OpenSSPComPort (cmd));





        }

出来一个错误 尝试读取或写入受保护的内存。这通常表明其他内存已损坏。 更新 重做，还是一样的错误 public unsafe struct SSP_FULL_KEY { System.Int64 FixedKey; System.Int64 EncryptKey; public SSP_FULL_KEY(System.Int64 fix, System.Int64 encr) { FixedKey = fix; EncryptKey = encr; } } public unsafe struct SSP_COMMAND { //string PortNumber; SSP_FULL_KEY key; System.Int64 BaudRate; // baud rate of the packet System.Int64 Timeout; // how long in ms to wait for a reply from the slave string PortNumber; // the serial com port number of the host string SSPAddress; // the SSP address of the slave string RetryLevel; // how many retries to the slave for non-response string EncryptionStatus; // is this an encrypted command 0 - No, 1 - Yes string CommandDataLength; // Number of bytes in the command fixed char CommandData[255]; // Array containing the command bytes string ResponseStatus; // Response Status (PORT_STATUS enum) string ResponseDataLength; // how many bytes in the response fixed char ResponseData[255]; // an array of response data string IgnoreError; // flag to suppress error box (0 - display,1- suppress) public SSP_COMMAND(string comport) { BaudRate = 9600; Timeout = 500; PortNumber = comport; RetryLevel = "5"; IgnoreError = "0"; EncryptionStatus = "0"; ResponseStatus = "0"; ResponseDataLength = "0"; SSPAddress = "0"; CommandDataLength = "0"; key = new SSP_FULL_KEY(0123456701234567, 0123456701234567); } }

Answer 1

您将 __int64 正确转换为 C# long。

然后你还想把long BaudRate和long Timeout变成C#long，但是错了，这些是32位变量。

最好忘记long 类型曾经存在过（就互操作而言），因为它总是会增加混乱。只需酌情使用System.Int64 和System.Int32。

您的字符串也是错误的，它们是 C++ 中的内联字符数组，这意味着您需要在 C# 中使用属性，否则 a fixed array。