<RatingBar
android:id="@+id/MyRating"
style="?android:attr/ratingBarStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:isIndicator="true"
android:numStars="5"
android:stepSize="0.1"
android:layout_above="@+id/textQuestion2"
android:layout_alignParentEnd="true"
android:layout_marginLeft="10dp"
android:layout_marginStart="10dp"
android:layout_alignParentRight="true" />
在上面的代码片段中，我试图将whitspace上的字符串标记为分隔符。每当我以public class SurveyActivity extends AppCompatActivity implements getQuestionsAsyncTask.GetQuestions,RatingBar.OnRatingBarChangeListener{
private ArrayList<Question> mQuestionsArrayList;
private TextView mTextQuestion1,mTextQuestion2;
private RatingBar ratingbar1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_survey);
Button next = (Button)findViewById(R.id.btn_next);
final RatingBar ratingBar = (RatingBar)findViewById(R.id.MyRating);
ratingBar.setOnRatingBarChangeListener(this);
next.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
float rating=ratingBar.getRating();
Toast.makeText(getApplicationContext(),"Your Selected Ratings : " + String.valueOf(rating),Toast.LENGTH_LONG).show();
}
});
}
@Override
public void onRatingChanged(RatingBar ratingBar, float v, boolean b) {
v = ratingBar.getRating();
Toast.makeText(getApplicationContext(), "Your Selected Ratings : " + String.valueOf(v), Toast.LENGTH_LONG).show();
}
或#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX_INPUT_LENGTH 1024
char *readline(FILE* fp, int max_length)
{
//The size is extended by the input with the value of the provisional
char *str;
int ch;
int len = 0;
int current_max = max_length;
str = (char*)malloc(sizeof(char)*current_max);
if(!str)
return str;
while((ch = fgetc(fp))!=EOF)
{
/* Separate newline handling from EOF handling */
if((char)ch == '\n')
{
str[len] = '\0';
return str;
}
str[len++] = ch;
if(len == current_max)
{
current_max = current_max + max_length;
str = realloc(str, sizeof(char)*current_max);
if(!str)
return str;
}
}
str[len] = '\0';
return str;
}
int main(void)
{
char *input, *token;
input = readline(stdin, MAX_INPUT_LENGTH);
printf("BEFORE\n");
token = strtok(input, " "); //Segmentation Fault Here
printf("AFTER"); //control never reaches here on " " or "\n" input.
}
提供输入时，newline(press ENTER)会调用段错误。根据我的理解，它应该返回a sequence of whitespaces我应该在稍后的理智检查中处理，但这并没有真正发生。
请帮助我，我在这里缺少什么？
答案 0 :(得分：1)
您对故障发生位置的分析不正确
printf("AFTER"); //control never reaches here on " " or "\n" input.
实际上，控制确实到达那里。你只是没有看到＆＃34; AFTER＆＃34;消息，因为那里没有换行或冲洗。将代码更改为此，神秘感将会消失：
printf("AFTER\n");
我打赌你不能用你的MCVE复制错误，因为它确实到达main的末尾，这会刷新输出。你忘记了＆＃34; V＆＃34;在MCVE。您需要验证它是否会复制问题。