Strange casting problem with tm structure
- by egiakoum1984
I have the following casting problem when my data structure sSpecificData contains a field of type tm:
typedef struct
{
unsigned char data[10000];
} sDataBuffer;
typedef struct
{
int m_Id;
sDataBuffer m_Data;
} sData;
typedef struct {
int m_value1;
int m_value2;
tm m_Date;
} sSpecificData;
const int SPECIFIC_SVC_DATA_SIZE = sizeof(sSpecificData);
typedef struct {
int m_Id;
sSpecificData m_Data;
} sMyData;
int main(void)
{
sData svc;
sMyData* ptr1 = (sMyData*) &svc;
sSpecificData* ptr2;
ptr2 = (sSpecificData*) &svc.m_Data;
ptr1->m_Data.m_value1 = 90;
ptr1->m_Data.m_value2 = 80;
cout << ptr1->m_Data.m_value1 << endl;
cout << ptr1->m_Data.m_value2 << endl;
cout << ptr2->m_value1 << endl;
cout << ptr2->m_value2 << endl;
return 0;
}
Without the field "tm m_Date;" as part of the sSpecificData, the output is correct:
90
80
90
80
With the field "tm m_Date;" as part of the sSpecificData, the output is wrong:
90
80
0 <-- !
90 <-- !
Is there any idea why my example doesn't work when there is field of type tm as part of the sSpecificData?
Thanks!
