c# - 调用 dll 方法时出现 FatalExecutionEngineError

Question

在我的程序中这一行:

int value = MTEConnect(auth_string, err);

我收到这样的异常:

FatalExecutionEngineError 
The runtime has encountered a fatal error. The address of the
error was at 0x68c8a681, on thread 0x2334. The error code is
0xc0000005. This error may be a bug in the CLR or in the unsafe
or non-verifiable portions of user code. Common sources of this
bug include user marshaling errors for COM-interop or PInvoke,
which may corrupt the stack.

MTEConnect 是这样导入的:

    [DllImport("mtesrl.dll", CharSet = CharSet.Ansi)]
    private static extern int MTEConnect(String pars, StringBuilder err);

问题是什么以及如何解决？

upd:我可以在另一台机器上重现同样的问题，但我得到了更具描述性的信息:

Managed Debugging Assistant 'FatalExecutionEngineError' has detected a problem in 'C:\blahblah\MBClient\bin\Debug\MBClient.vshost.exe

库本身是有功能的，因为它可以在其他应用程序中使用，我只是不能在 c# 中使用它

Answer 1

我的问题解决了!代码不能这样工作:

StringBuilder err = new StringBuilder();
int value = MTEConnect(auth_string, err);

但它确实是这样工作的:

StringBuilder err = new StringBuilder(100);
int value = MTEConnect(auth_string, err);

看来缓冲区太短了。