cwindowsvisual-studiodriverkernel-mode

kernel driver: How get correct content of each variable in a struct?

I have the following code involving a struct including pointer variables and I am not able to retrieve the correct contents of each variable.

Someone can help me please?

struct MyData
    {
        ULONG Value[3];
        wchar_t *Str1;
        int Str1Len;
        wchar_t *Str2;
        int Str2Len;
    };

    // In the driver, on method that receives commands i have following:

    struct MyData *pData = (struct MyData*) Irp->AssociatedIrp.SystemBuffer; 

    DbgPrint("0x%x \n 0x%x \n 0x%x \n %s \n %d \n %s \n %d", &pData->Value[0], &pData->Value[1], &pData->Value[2], &pData.Str1, &pData->Str1Len, &pData->Str2, &pData->Str2Len);
Solution

  • DbgPrint is called very much like printf is called, so you should pass the values, not the address of the values. So

    DbgPrint("0x%x \n 0x%x \n 0x%x \n %s \n %d \n %s \n %d", &pData->Value[0], // etc...

    should be 

    DbgPrint("0x%x \n 0x%x \n 0x%x \n %s \n %d \n %s \n %d", pData->Value[0],  // etc...