c-将数组转换为使用malloc

Question

目前我已经设置了一个数组来容纳程序创建的50个数据包。然而，我想将这个数组更改为使用malloc，同时使用最多存储50条信息，就像当前数组一样。

以下是用于设置int主下使用的数组的当前代码

struct packet create[50];
int countpackets = 0;

数组在代码中的另一个函数中递增，也是如此

int add(struct packet *create, int countpackets){
char inputDest[10],inputType[4],inputPort[2],inputData[50],inputSource[10];
if (countpackets == 50){
puts("Too many packets already entered.");
}else{
printf("nn");
int i = 0;
printf("t Source - Must be 1024 or below >t");
scanf("%s", inputSource);
create[countpackets].source = atoi(inputSource);
for (i = 0; i < strlen(inputSource); i++){
 while(isdigit(inputSource[i])== 0 || create[countpackets].source > 1024){ 
 printf("************************************************** n");
 puts("Invalid input, numbers only or number too bign");
 printf("t please re-enter your Source >");
 scanf("%s", inputSource); //rescans if it's a letter
 create[countpackets].source = atoi(inputSource);
 }
 }
 printf("t Destination - Must be 1024 or below >t");
 scanf("%s", inputDest);
 create[countpackets].destination = atoi(inputDest);
 for (i = 0; i < strlen(inputDest); i++)
 {
 while(isdigit(inputDest[i])== 0 || create[countpackets].destination > 1024){ 
 printf("************************************************** n");
 puts("Invalid input, numbers only or number too bign");
 printf("t please re-enter your Destination >");
 scanf("%s", inputDest); //rescans if it's a letter
 create[countpackets].destination = atoi(inputDest);
 }
 }

 printf("t Type - Must be 10 or below >t");
 scanf("%s", inputType);
 create[countpackets].type = atoi(inputType);
 for (i = 0; i < strlen(inputType); i++){
 while(isdigit(inputType[i])== 0 || create[countpackets].type > 10){ 
  printf("************************************************** n");
 puts("Invalid input, numbers only or number too big t n");
 printf("t please re-enter your Type >");
 scanf("%s", inputType); //rescans if it's a letter
 create[countpackets].type = atoi(inputType);
 }
  }
 printf("t Port - Must be 1024 or below >t");
 scanf("%s", inputPort);
 create[countpackets].port = atoi(inputPort);
 for (i = 0; i < strlen(inputPort); i++)
 {
 while(isdigit(inputPort[i])== 0 || create[countpackets].port > 1024){
 printf("************************************************** n");
 puts("Invalid input, numbers only or number too big t n");
 printf("t please re-enter your Type >");
 scanf("%s", inputPort); //rescans if it's a letter
 create[countpackets].port = atoi(inputPort);
 }
 }
 printf("t Data have less than 50 characters >t");
 scanf("%s", inputData);
 for (i = 0; i < strlen(inputData); i++){
 while(isdigit(inputData[i])== 0){ //checks if it's a letter
 printf("************************************************** n");
 puts("Invalid input, numbers only or number too big t n");
 printf("t please re-enter your Type >");
 scanf("%s", inputData); //rescans if it's a letter
  }
 strcpy(create[countpackets].data, inputData);
  }
  }
  countpackets++;
  return countpackets;
  }

我对C还很陌生，我相信这就是我需要展示的所有代码，但如果需要的话，我会发布我的完整程序。任何帮助都将不胜感激。

Answer 1

如果您想声明。。。

struct packet create[50];

使用malloc，您将不得不这样做。。。

struct packet *pCreate = malloc(50 * sizeof(struct packet));

你可以同样使用它。

create[0] = pCreate[0];   // First element
create[49] = pCreate[49]; // Last element