C# marshal array of structs to function in c dll as output parameter -


i call function in c dll, c# application, takes fixed array of structs function argument, , modifies data.

[dllimport("my_c_program.dll",  callingconvention=callingconvention.cdecl)] public static extern int getdata([marshalas(unmanagedtype.lparray,                                             arraysubtype = unmanagedtype.struct,                                             sizeconst=4)]                                  mydatastruct[] mydata);

i make call function

   mydatastruct [] mydataarrayofstructs = new mydatastruct[4];    getrangingmeasurementdata(mydataarrayofstructs);

and can confirm function receives array , modifies data, however, following completion of function, returned array unchanged.

can please advise doing wrong.

thanks.


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