# C# 如何调用动态连接库？

1. 导入命名空间 using System.Runtime.InteropServices;
2. 把 非托管DLL放入执行程序同级目录，比如 Debug 、Release 。

[DllImport("XQOCR.dll", EntryPoint = "XQOCR_IsSupport", ExactSpelling = false, CallingConvention = CallingConvention.StdCall)]
public static extern int XQOCR_IsSupport();

[DllImport("XQOCR.dll", EntryPoint = "XQOCR_OPenByDefault", ExactSpelling = false, CallingConvention = CallingConvention.StdCall)]
public static extern int XQOCR_OPenByDefault(string docPath);

DllImport 引用路径

DllImport 会在以下目录中寻找依赖：

1. exe根目录
2. system32目录
3. 环境变量目录