之前用sscanf也是得心应手的, 比如:
- #include <stdio.h>
- #include <string.h>
-
- int main()
- {
- char szLine[100] = {0};
- int left = 0;
- int right = 0;
-
- strncpy(szLine, "123=456", sizeof(szLine) - 1);
- int nRet = sscanf(szLine, "%d=%d", &left, &right);
- printf("nRet is %d\n", nRet);
-
- printf("left is %d, right is %d\n", left, right);
-
- return 0;
- }
结果很正常:
nRet is 2
left is 123, right is 456
现在, 碰到了字符串, 所以我随心所欲地类比写成:
- #include <stdio.h>
- #include <string.h>
-
- int main()
- {
- char szLine[100] = {0};
- char szKey[50] = {0};
- char szValue[50] = {0};
-
- strncpy(szLine, "xxx=yyy", sizeof(szLine) - 1);
- int nRet = sscanf(szLine, "%s=%s", szKey, szValue);
- printf("nRet is %d\n", nRet);
-
- if(0 == strcmp(szKey, "xxx"))
- {
- printf("yes, key\n");
- }
-
- if(0 == strcmp(szValue, "yyy"))
- {
- printf("yes, value\n");
- }
-
- return 0;
- }
结果为:
nRet is 1
从结果看, 解析失败, 为什么呢? 原来此时=并没有做分割符, 而是做了szKey的一部分, 此时szValue仍然是空串。 那该怎么改呢?如下:
- #include <stdio.h>
- #include <string.h>
-
- int main()
- {
- char szLine[100] = {0};
- char szKey[50] = {0};
- char szValue[50] = {0};
-
- strncpy(szLine, "xxx=yyy", sizeof(szLine) - 1);
- int nRet = sscanf(szLine, "%[^=]=%[^=]", szKey, szValue);
- printf("nRet is %d\n", nRet);
-
- if(0 == strcmp(szKey, "xxx"))
- {
- printf("yes, key\n");
- }
-
- if(0 == strcmp(szValue, "yyy"))
- {
- printf("yes, value\n");
- }
-
- return 0;
- }
结果为:
nRet is 2
yes, key
yes, value
以后还是要小心啊, 定位较长时间, 才发现是栽倒在这个最简单的地方
。
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