memory-address

来源： https://stackoverflow.com/questions/15511731/effects-of-vector-pushback-on-element-address

问题 During reading of an Intel manual book I came across the following: On processors that support Intel 64 architecture, the IA32_SYSENTER_ESP field and the IA32_SYSENTER_EIP field must each contain a canonical address. What is a 'canonical address'? 回答1: I suggest that you download the full software developer's manual. The documentation is available in separate volumes, but that link gives you all seven volumes in a single massive PDF, which makes it easier to search for things. The answer is

问题 During reading of an Intel manual book I came across the following: On processors that support Intel 64 architecture, the IA32_SYSENTER_ESP field and the IA32_SYSENTER_EIP field must each contain a canonical address. What is a 'canonical address'? 回答1: I suggest that you download the full software developer's manual. The documentation is available in separate volumes, but that link gives you all seven volumes in a single massive PDF, which makes it easier to search for things. The answer is

问题 int (*p)[4] , *ptr; int a[4] = {10,20,30,40}; printf("%p\n%p\n%p",&a,a,&a[0]); p = &a ; //p=a; gives error //ptr = &a; gives error ptr = a; Output: 0x7ffd69f14710 0x7ffd69f14710 0x7ffd69f14710 I tried to understand what a , &a , and &a[0] returns and its the memory address of starting variable. So, why am I getting errors in some of these assignments ? I mean, if p = &a = 0x7ff... works, why not p = a = 0x7ff.. ? If possible, can anyone please make me understand through a block diagram of

问题 I am trying to calculate the maximum memory size knowing the bit length of an address and the size of the memory cell. It is my understanding that if the address is n bits then there are 2^n memory locations. But then to calculate the actual memory size of the machine, you would need to multiply the number of addresses by the size of the memory cell. Is that correct? To put it another way, Step 1: calculate the length of the address in bits (n bits) Step 2: calculate the number of memory

问题 I have a char array and I need to get the address of each element. cout << &charArray gives me a valid address, However if I try to get the address of a specific element, it spits out garbage: cout << &charArray[0] 回答1: std::cout << (void*) &charArray[0]; There's an overload of operator<< for char* , that tries to print the nul-terminated string that it thinks your pointer points to the first character of. But not all char arrays are nul-terminated strings, hence the garbage. 回答2: You can do

问题 I have a char array and I need to get the address of each element. cout << &charArray gives me a valid address, However if I try to get the address of a specific element, it spits out garbage: cout << &charArray[0] 回答1: std::cout << (void*) &charArray[0]; There's an overload of operator<< for char* , that tries to print the nul-terminated string that it thinks your pointer points to the first character of. But not all char arrays are nul-terminated strings, hence the garbage. 回答2: You can do

问题 I am currently using python 3.6, and I was playing around with the id() function. When I run the following code in IDLE, x = 1 print(id(x), id(1)) The two memory addresses are the same. (1499456272 for me) My understanding is the integer 1, which is an object, has a memory address, and when the object is assigned to x, the variable gains the same memory address of the object. (not sure if this is correct) When I replicate the above code using a string, for instance s = "a" print(id(s), id("a"

问题 How should I set my_printf, so it would do what printf("%p") does + without using printf. void my_printf(char * format, ...) { va_list ap; va_start(ap, format); if(!strcmp(format,"%p")) { void *address= va_arg (ap, void*); char *arr=malloc(sizeof(address)); arr=address; arr[strlen(arr)]='\0'; write(1,arr,strlen(arr)); } va_end (ap); //it has to print an address in hexadecimal format. } 回答1: In : char *arr=malloc(sizeof(address)); arr=address; the allocated block is lost, this is a memory leak

问题 I want to read in a Python script a number of bytes starting from a specific address. E.g., I want to read 40000 bytes starting from 0x561124456. The pointer is given from a C# app. I want to use this method to pass data between the app and script. I've used a TCP socket via localhost, but I want to try this method also. How can I do this? 回答1: If you really want to, enjoy: import ctypes g = (ctypes.c_char*40000).from_address(0x561124456) Looks like segfault fun. There are good socket