mfc - Can a COM interface return a integer instead of a long? -


here class , associated interface:

[guid("xx")] [comvisible(true)] [interfacetype(cominterfacetype.interfaceisiunknown)] public interface istudentitem {     string type { get; set; }     datetime week { get; set; }     int study { get; set; } }  [guid("yy")] [classinterface(classinterfacetype.none)] [comvisible(true)] public class studentitem : istudentitem {     public string type { get; set; }     public datetime week { get; set; }     public int study { get; set; } }

as can see, study defined int.

but in mfc side, when using property, end long:

long lstudynumber = 0; if(succeeded(studentitem->get_study(&lstudynumber)))     oentry.istudypoint = static_cast<int>(lstudynumber);

my dll in both 86x , 64x editions. there way get_study property return integer instead?

why want this. use appropriate type makes sense data in os , bitness.

you can use int. coms know __int3264 type in midl compiler , inside tlb (type libraries) , variant has vt_int type.

so idispatch driven automation receive correspondent value.

but aware there marshaling, when have 64bit external com server , 32bit process asks data, marshaller transform previous vt_int vt_i8... on other hand 32bit external com server return vt_int vt_i4 64bit process...


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