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.NET Forum / Languages / Managed C++ / May 2004How to convert structure from managed to unmanaged type
Esteemed Developers I am trying to pin a structure, but compiler does not execute this statement. Can you kindly check where could be the problem is? (I use Visual C++ .NET Standard Form1. -------------------------------------------------------------------------------- public __gc class Form1 : public System::Windows::Forms::For { public .... int retBindVal SOCKET ServerSocket, ClientSocket sockaddr_in ServerSockAddrIn, ClientSockAddrIn ..... ------------------------------------------------------------------- ================================================================= Form1.CP ------------------------------------------------------------------- void Form1::Start_Server( ... sockaddr_in __pin * pinned_ServerSockAddrIn; //This statement is nor executed. It jumps to next statement directl pinned_ServerSockAddrIn = &ServerSockAddrIn retBindVal = bind ( ServerSocket, (struct sockaddr*) &pinned_ServerSockAddrIn, sizeof(*pinned_ServerSockAddrIn) ) ... ======================================================== I tried __pin at structure but it did not work,too. My code was as follows sockaddr_in __pin * pinned_ServerSockAddrIn pinned_ServerSockAddrIn = &__box(ServerSockAddrIn) the compiler gave the following error message: error C3627: Only a value type can be boxe > sockaddr_in __pin * pinned_ServerSockAddrIn; //This statement is nor executed. It jumps to next statement directly > pinned_ServerSockAddrIn = &ServerSockAddrIn; The first statement is skipped because it is just a declaration that doesn't contain any code to execute. The variable isn't actually initialized until the following statement. I would normally combine the declaration and the initialization into a single statement: sockaddr_in __pin * pinned_ServerSockAddrIn = &ServerSockAddrIn; This won't change the behavior of your code at all, so if you are having problems, the problems are somewhere else.  SignatureDavid Olsen qg4h9ykc5m@yahoo.com Hello David Thank You very much for your response. I have tried your recommendation before. As you mentioned that the problem seems to be somewhere else. Problem is at the bind() and then, of course, at the listen() functions. When I use the following code, the bind() returns Error#10047 that is "Address family not supported by protocol family". The code is as follows sockaddr_in __pin * pinned_ServerSockAddrIn = &ServerSockAddrIn retBindVal = bind(ServerSocket, (struct sockaddr*)&pinned_ServerSockAddrIn, sizeof(*pinned_ServerSockAddrIn) ) I found a solution for the "struct" casting. At this code, there is not any __pin. Therefore the first line above is omitted. The working code is as follows retBindVal = bind(ServerSocket, (struct sockaddr*)&pinned_ServerSockAddrIn, sizeof(*pinned_ServerSockAddrIn) ) I would like to thank your consideration, again Hello David I notices that I wrote the wrong code to my previous response Working code is as follows retBindVal = bind(ServerSocket, (LPSOCKADDR)&ServerSockAddrIn, sizeof(ServerSockAddrIn));
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