struct强转可以使用常数地址

Posted 2023-02-21 fulianzhou

#pragma pack(1)
struct TestST

    int bac;
    char* cptr;
    int *iptr;
    char ccc;
    long long lll;
;
#pragma pack

int main(int argc, char* argv[])

    TestST *pTestST = new TestST;
    memset(pTestST, 0, sizeof(TestST));
    printf("pTestST=%ld\\n", pTestST);
    
    printf("sz=%d\\n", sizeof((struct TestST*)pTestST)->cptr);
    printf("offset=%ld\\n", (int)&((struct TestST*)pTestST)->lll);
    printf("sz=%d\\n", sizeof((struct TestST*)11)->cptr);
    printf("offset=%d\\n", (int)&((struct TestST*)12)->lll);
    printf("sz=%d\\n", sizeof((struct TestST*)0)->cptr);
    printf("offset=%d\\n", (int)&((struct TestST*)0)->lll);
    //delete pTestST;
    return 0;