FIX: DCOM95 1.2 or DCOM98 Causes Data Corruption in RPC Calls (216889)

typedef struct tagConformantStruct 
{
   unsigned long        size;
   [size_is(size)] char data[];
} ConformantStruct;

typedef enum tagColor
{
   Red, Blue, Green
} Color;

typedef union tagMyUnion switch (Color type) u
{
   case Red :  long  longArm;
   case Blue:  short shortArm;
   case Green: char  charArm;
} MyUnion;

typedef struct tagComplexStruct
{
   unsigned long numUnions;
   ConformantStruct* pConfStruct; // PROBLEM! pointer to conformant struct.
   [size_is(numUnions)] MyUnion myUnions[]; // Makes the struct complex.
} ComplexStruct;
				

RESOLUTION

A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next update that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

   File name   Version     Date       Time     Size
   --------------------------------------------------------
   RPCRT4.DLL  4.71.3116   03-04-99   7:16a   321,296