Delphi C++ Dll

[Klaus01]

Hi,

will it make a difference when using a packet record instead the unpacked one?

Delphi-Quellcode:

UserIdentity = packet record
    name_ : PAnsiChar;
    id : Integer;
  end;

Best regards
Klaus

[Zacherl]

size_t is a plaform and architecture specific type ... using UInt32 might not be correct e.g. for 64-bit. The real problem is this part tho: GetMem(LUserEntity, pCount); It has to be GetMem(LUserEntity, pCount * SizeOf(UserEntity));

[Der schöne Günther]

Why even multiply with `count`? The size of the struct is always the same. It only contains a pointer, not the characters themselves.

[Zacherl]

Zitat von Der schöne Günther:

Why even multiply with `count`? The size of the struct is always the same. It only contains a pointer, not the characters themselves.

Nope. It fills the memory described by the pointer with the list elements. In C/C++ int* is basically the same as int[] . The struct size is ofc. the same, but the number of elements in the array might be different each time, so you have to alloc enough space to prevent buffer overrides (thats what happening without the *count).

[Der schöne Günther]

My bad, I did not read properly. I thought "count" was referring to the number of characters in the string, not the number of structs returned.

[mandoza]

Zitat von Zacherl:

size_t is a plaform and architecture specific type ... using UInt32 might not be correct e.g. for 64-bit. The real problem is this part tho: GetMem(LUserEntity, pCount); It has to be GetMem(LUserEntity, pCount * SizeOf(UserEntity));

Thank you Zacherl , I've fixed the issue by using string fixed length in both C++ and Delphi , and using the UIntPtr instead of UInt32

Again thank you .