char * SequenceTokenAnalizer :: NextToken(char delim){
int main()
{
SequenceTokenAnalizer st1("This is a test");
char* helpSequence;
helpSequence = st1.NextToken();
cout << helpSequence << endl;
delete[] helpSequence;
}
int i = currentindex, i2 = currentindex, cnt = 0, j = 0;
char *token=NULL;
if (Sequence[i2] == delim)
{
while (Sequence[i2] == delim&& Sequence[i2] != '\0')
{
i2++;
}
while (Sequence[i2] != delim&& Sequence[i2]!='\0')
{
cnt++;
i2++;
}
token = new char[cnt];
if (Sequence[i] == delim)
{
while (Sequence[i] == delim)
{
i++;
}
while (Sequence[i] != delim&& Sequence[i2] != '\0')
{
token[j] = Sequence[i];
i++;
j++;
}
token[j] = '\0';
currentindex = i;
return token;
}
}
else
{
while (Sequence[i2] != delim)
{
cnt++;
i2++;
}
token = new char[cnt];
if (Sequence[i] == delim)
{
while (Sequence[i] == delim)
{
i++;
}
while (Sequence[i] != delim)
{
token[j] = Sequence[i];
i++;
j++;
}
token[j] = '\0';
currentindex = i;
return token;
}
else
{
while (Sequence[i] != delim)
{
token[j] = Sequence[i];
i++;
j++;
}
token[j] = '\0';
currentindex = i;
return token;
}
}
类:
#包括
#包括
使用命名空间std;
const int SIZE = 80;
class SequenceTokenAnalizer {
char Sequence[SIZE];
char delimiter;
int currentindex;
上市:
SequenceTokenAnalizer(char str[]);
SequenceTokenAnalizer(char str[], char delim);
int LengthSequence();
int CountAllTokens();
void ResetTokens();
int CountTokens();
bool HasMoreTokens();
bool HasMoreTokens(char delim);
char* NextToken();
char* NextToken(char delim);
bool Equals(SequenceTokenAnalizer other);
bool NotEquals(SequenceTokenAnalizer other);
bool isCommonToken(SequenceTokenAnalizer other);
void PrintCommonTokens(SequenceTokenAnalizer other);
};
在主要使用delete []之后我得到crt检测到应用程序在堆缓冲结束后写入内存请helppppp在这里我有序列并且必须在使用delete []之后从当前索引返回kk,我得到crt检测到应用程序在堆缓冲区结束后写入内存请helppppp这里我有序列,并且必须从当前索引返回下一个tokken
1 回答
你没有发布构造函数,但我认为
"This is a test"
是输入,' '
是分隔符,currentindex = 0 .现在按照代码
这是错误的,因为
i2=0
和Sequence[0]
包含'T'
. 所以跳到其他部分 .i2
必须增加4倍才能到达空间 . 这意味着cnt也将是4,你分配4个字节 .因为
i
从保存值开始为i2
,所以始终为false . 所以再次移动到其他部分现在您将
"This"
复制到4字节缓冲区中,但也在第5位写入'\0'
.在您编辑之前,您的代码包含此部分,这也是错误的:
strlen返回没有
'\0'
的长度,但是strcpy使用它 .此外,这看起来像一个复制/粘贴错误:
我希望
i
而不是i2