去掉ref试试,或者用stringbuilder试试
如果改了stringbuilder还有问题, DllImport相关的属性最好都显式说明下,例如: [DllImport("mydll", EntryPoint = "MyFunction", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
[DllImport("mydll", EntryPoint = "MyFunction", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
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