[英]C# EntryPointNotFoundException
In my C# program, I'm making a call to the AT91Boot_Scan
function in sam-ba.dll
.在我的 C# 程序中,我正在调用
sam-ba.dll
的AT91Boot_Scan
函数。 In the documentation for this DLL, the signature for this function is void AT91Boot_Scan(char *pDevList)
在此 DLL 的文档中,此函数的签名为
void AT91Boot_Scan(char *pDevList)
Unfortunately, no matter what I try I keep getting EntryPointNotFoundException
and ArgumentNullException
errors:不幸的是,无论我尝试什么,我都会不断收到
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
My code is as follows, what am I doing wrong?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;
}
Following David Tansey's solution in the comments, the way I should've gone about doing this was adding sam-ba.dll
as a COM reference (Solution Explorer > References > Add References > Browse). 在评论中评论了David Tansey的解决方案之后,我应该做的方法是添加
sam-ba.dll
作为COM参考(解决方案资源管理器>参考>添加参考>浏览)。 Then just instantiating a ISAMBADLL
class object and calling the methods through that class. 然后只需实例化一个
ISAMBADLL
类对象并通过该类调用方法。
如果在 Unity 中运行时控制台窗口中弹出异常,构建并运行项目,它应该可以正常工作。
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