こんな感じ｡

 int *pInt;
 double *pDouble;

 hFMWrite = OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE, L"SharedMemory");

 pInt = (int*)MapViewOfFile(hFMWrite,FILE_MAP_ALL_ACCESS, 0, 0, 0);
 *pInt = 10;

 pDouble = ((double*)pInt) + 1;
 *pDouble = 3.1415;

複数の値を書き込むときには､位置を意識しなくちゃいけないので､構造体を使うのが楽です｡

 struct share_data {
 int no;
 double value;
 char name[128];
 } *p;

 hFMWrite = OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE, L"SharedMemory");

 p = (struct share_data*)MapViewOfFile(hFMWrite,FILE_MAP_ALL_ACCESS, 0, 0, 0);
 p->no = 10;
 p->value = 3.1415;
 strcpy(p->name, "a-kuma3");