C / C++ / MFC

typedef struct
{
   int DataCount;
   int* pSomeData;

   void SaveData(HANDLE* hFile)
   {
      DWORD NumberOfBytesWritten;
      WriteFile(hFile, &DataCount, sizeof(int), &NumberOfBytesWritten, NULL);
      WriteFile(hFile, pSomeData, sizeof(int)*DataCount, &NumberOfBytesWritten, NULL);
   }

   void LoadData(HANDLE* hFile)
   {
      DWORD NumberOfBytesRead;
      ReadFile(hFile, &DataCount, sizeof(int), &NumberOfBytesRead, NULL);
      pSomeData = new int[DataCount];
      ReadFile(hFile, pSomeData, sizeof(int))*DataCount, &NumberOfBytesRead, NULL);
   }
} YourStruct;

YourStruct* pStruct = new YourStruct;
//Do something with pStruct
//..
//..
pStruct->SaveData(hFile);

YourStruct* pStruct = new YourStruct;
pStruct->LoadData(hFile);
//Do something with pStruct
//..
//..

Cstring cs=...;
std::string s=(LPCSTR)cs;