PAssing string arrays from C++ through DLL

[NegInfinity]

@sameek4;435092

Hello , thanks for your reply. Have figured it out. It should be like this ->

C++

	std::vector<std::string> ColumnNames;
	std::vector<std::string> ColumnValues;

char ** arrnames = new char*[ColumnNames.size()];
	for (size_t i = 0; i < ColumnNames.size(); i++) {
		arrnames* = new char[ColumnNames*.size() + 1];
		strcpy(arrnames*, ColumnNames*.c_str());
	}

	char ** arrvalues = new char*[ColumnValues.size()];
	for (size_t i = 0; i < ColumnValues.size(); i++) {
		arrvalues* = new char[ColumnValues*.size() + 1];
		strcpy(arrvalues*, ColumnValues*.c_str());
	}

bool result = DLLFuncPtr(length, tablename, arrnames, arrvalues);

C#

   [DllExport("InsertData", CallingConvention = CallingConvention.Cdecl)]
        static public bool InsertData(int columncount , String TableName, [In , MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.LPStr, SizeParamIndex = 0)]String] ColumnNames , [In, MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.LPStr, SizeParamIndex = 0)]String] Values)
      {
       //Body
       }

It actually shouldn’t be like this, because you forgot to delete every single array and now have multiple memory leaks in your program.
Use std::vector<char*> or TArray<char*> instead. TArray has GetData() method for situations like this.