C#调用C语言dll

在拥有C/C++学习基础上学习C#

在winform平台上，有时需要与另外的C语言对接传输数据，在C语言已封装成dll情况下，在VS2019上如何调用dll实现调用C语言定义的函数。

使用DLLImport

// An highlighted block [DllImport("AAA.dll", EntryPoint = "BBB",             CallingConvention = CallingConvention.Cdecl)] public unsafe static extern CCC BBB();

其中AAA为C语言封装好的dll，BBB为入口点函数的名称，CCC为调用函数时使用的数据类型。

举例

// An highlighted block [DllImport("Workstation.dll", EntryPoint = "getIP",             CallingConvention = CallingConvention.Cdecl)] public unsafe static extern IntPtr getIP()； 

从封装好的Workstation.dll中调用函数实现模拟传感器数据输入及显示准备工作

// An highlighted block [DllImport("Workstation.dll", EntryPoint = "getIP",             CallingConvention = CallingConvention.Cdecl)] public unsafe static extern IntPtr getIP(); [DllImport("Workstation.dll", EntryPoint = "initSensors",             CallingConvention = CallingConvention.Cdecl)] public static extern int initSensors(); [DllImport("Workstation.dll", EntryPoint = "getCodedDataPackage_ModeNormal",             CallingConvention = CallingConvention.Cdecl)] public unsafe static extern IntPtr getCodedDataPackage_ModeNormal(int sensorID); [DllImport("Workstation.dll", EntryPoint = "decodeDataPackage_ModeNormal",             CallingConvention = CallingConvention.Cdecl)] public unsafe static extern int* decodeDataPackage_ModeNorma(string codeDataPackage);