AT91Boot_Scan在我的 C# 程序中，我正在调用sam-ba.dll. 在此 DLL 的文档中，此函数的签名是void AT91Boot_Scan(char *pDevList)
不幸的是，无论我尝试什么，我都会不断遇到EntryPointNotFoundException错误ArgumentNullException：
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，我做错了什么？
[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;
}