C strlen指针与数组
我在使用指针与静态数组时遇到了一些问题。我被困在这个错误中:C strlen指针与数组,c,string,macos,pointers,memory-management,C,String,Macos,Pointers,Memory Management,我在使用指针与静态数组时遇到了一些问题。我被困在这个错误中: void LZWCompress(FILE* file, char minCodeSize, char *pixels, int area) { int k = ++minCodeSize, i, len = DEFAULT, jump = 0, dicLen; lzwDict *dictionary = NULL, *s, *temp; char *curr, next[2], *buffer; dicLen = initia
void LZWCompress(FILE* file, char minCodeSize, char *pixels, int area)
{
int k = ++minCodeSize, i, len = DEFAULT, jump = 0, dicLen;
lzwDict *dictionary = NULL, *s, *temp;
char *curr, next[2], *buffer;
dicLen = initializeDictionary(&dictionary, minCodeSize);
for(i = 0; i < area; i++)
{
if(dicLen + 1 >= pow(2, k))
k = k + 1;
curr = (char*) malloc(sizeof(char) * DEFAULT);
curr[0] = pixels[i];
curr[1] = '\0';
printf("strlen %lu %s\n", strlen(curr)); ### strlen(curr) = 0 ? WH ? ###
if((i + 1) > area)
{
//outputs curr
break;
}
len = len + 1;
jump = jump + 1;
next[0] = pixels[i + jump];
next[1] = '\0';
buffer = (char*) malloc(sizeof(char) * len);
printf("%lu %lu %lu \n", strlen(buffer), strlen(curr), strlen(next)); ### prints out "0 0 1" ###
(…)代码继续
为什么在使用数组(下一步[2])时会得到预期的结果,而在使用指针(*curr,*buffer)时却没有得到预期的结果
如果相关的话,我正在使用OSX优胜美地。根据strlen:
C字符串的长度由终止空字符决定:C字符串的长度等于字符串开头和终止空字符之间的字符数(不包括终止空字符本身)
这不应与保存字符串的数组大小混淆。
如果像素[i]等于0,strlen(next)将为0。预期结果和具体错误是什么?这段代码非常可怕。它应该做什么?
buffer = strcat(curr, next);
HASH_FIND_STR(dictionary, buffer, s);
if(s)
{
printf("YOLO\n");
do{
jump = jump + 1;
if(i + jump >= area)
exit(-1);
printf("%d \n", len);
curr = (char*) realloc(curr, sizeof(char) * len); ### Here i get Abort Trap 6 ###