正确使用sscanf解析字符串c++

Proper use of sscanf to parse string c++

本文关键字：字符串 c++ sscanf      更新时间：2023-10-16

缓冲区中的文本：

Source$1
Destination$5

代码：

char buffer[50];
int start = 0;
int dest = 0;
FILE * infile = fopen(argv[1], "r")
fgets(buffer, sizeof(buffer), infile);
sscanf(buffer, "Source$%d", &start); 
printf("start: %d n", start);
fgets(buffer, sizeof(buffer), infile);
sscanf(buffer, "Destination$%d", &dest);
printf("destination: %d n", dest);

输出：

start: 0
destination: 5

目的地是正确的号码，而起点不是。我该如何解决这个问题？

我在您发布的代码中看不到任何错误。最好添加代码来执行错误检查。然后你可以看到问题出在哪里。

if ( fgets(buffer, sizeof(buffer), infile) )
{
   printf("%s", buffer);
   if ( sscanf(buffer, "Source$%d", &start) == 1 )
   {
      printf("start: %d n", start);
   }
   else
   {
      printf("Unable to read source from buffern");
   }
}
else
{
   printf("Unable to read the text for sourcen");
}

if ( fgets(buffer, sizeof(buffer), infile) )
{
   printf("%s", buffer);
   if ( sscanf(buffer, "Destination$%d", &dest) == 1 )
   {
      printf("destination: %d n", dest);
   }
   else
   {
      printf("Unable to read destination from buffern");
   }
}
else
{
   printf("Unable to read the text for destinationn");
}
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