C# EntryPointNotFoundException 异常

Question

在我的 C# 程序中，我正在调用 sam-ba.dll 中的 AT91Boot_Scan 函数。在这个 DLL 的 documentation 中，这个函数的签名是 void AT91Boot_Scan(char *pDevList)

不幸的是，无论我尝试什么，我都会收到 EntryPointNotFoundException 和 ArgumentNullException 错误：

Exception thrown at 0x75E3C54F in MyApp.exe: Microsoft C++ exception: EEMessageException at memory location 0x0038E304.
Exception thrown: 'System.EntryPointNotFoundException' in MyApp.exe
Unable to find an entry point named 'AT91Boot_Scan' in DLL 'sam-ba.dll'.
Exception thrown: 'System.ArgumentNullException' in System.Windows.Forms.dll

我的代码如下，我哪里做错了？

[DllImport("sam-ba.dll")]
unsafe public static extern void AT91Boot_Scan(char* pDevList);

unsafe private string[] LoadDeviceList()
    {
        const int MAX_NUM_DEVICES = 10;
        const int BYTES_PER_DEVICE_NAME = 100;

        string[] deviceNames = new string[MAX_NUM_DEVICES];

        try
        {
            unsafe
            {
                // A pointer to an array of pointers of size MAX_NUM_DEVICES
                byte** deviceList = stackalloc byte*[MAX_NUM_DEVICES];

                for (int n = 0; n < MAX_NUM_DEVICES; n++)
                {
                    // A pointer to a buffer of size 100
                    byte* deviceNameBuffer = stackalloc byte[100];
                    deviceList[n] = deviceNameBuffer;
                }

                // Is casting byte** to char* even legal?
                AT91Boot_Scan((char*)deviceList); 

                // Read back out the names by converting the bytes to strings
                for (int n = 0; n < MAX_NUM_DEVICES; n++)
                {
                    byte[] nameAsBytes = new byte[BYTES_PER_DEVICE_NAME];
                    Marshal.Copy((IntPtr)deviceList[n], nameAsBytes, 0, BYTES_PER_DEVICE_NAME);

                    string nameAsString = System.Text.Encoding.UTF8.GetString(nameAsBytes);
                    deviceNames[n] = nameAsString;
                }
            }
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
        return deviceNames;
    }

Answer 1

按照 David Tansey 在评论中的解决方案，我应该这样做的方式是添加 sam-ba.dll 作为 COM 引用（解决方案资源管理器 > 引用 > 添加引用 > 浏览）。然后只需实例化一个 ISAMBADLL class 对象并通过该 class 调用方法。

C# EntryPointNotFoundException 异常

C# EntryPointNotFoundException

c#

entrypointnotfoundexcept

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