为什么我得到一个断言失败？ [英] Why do I get an assertion failure?

问题描述

这code，当我尝试使用VC2010调试失败：

This code fails when I try to debug it using VC2010:

char frd[32]="word-list.txt";

FILE *rd=fopen(frd,"r");
if(rd==NULL)
{
std::cout<<"Coudn't open file\t"<<frd;
exit(1);
}
char readLine[100]; 
while(fgets(readLine, 100, rd) != NULL)
{     
    readLine[strlen(readLine) - 1] = '\0'; 
    char *token = NULL; 
    token = strtok(readLine, " ,"); 
    insert(readLine);
} 

调试结果

---------------------------微软的Visual C ++调试库-----------

--------------------------- Microsoft Visual C++ Debug Library-----------

调试断言失败！

程序：... \\文档\\ Visual Studio 2010的\\项目\\博鳌亚洲论坛\\调试\\ bfa.exe
  文件：F：\\ DD \\ vctools \\ crt_bld \\ self_x86 \\ CRT \\ SRC \\ fgets.c行：57

Program: ...\documents\visual studio 2010\Projects\bfa\Debug\bfa.exe File: f:\dd\vctools\crt_bld\self_x86\crt\src\fgets.c Line: 57

防爆pression：（！STR = NULL）

Expression: ( str != NULL )

有关您的程序如何可以导致了断言失败的信息，
  请参阅Visual C ++文档上断言。

For information on how your program can cause an assertion failure, see the Visual C++ documentation on asserts.

（preSS重试来调试应用程序）

(Press Retry to debug the application)

我得到的错误号为2;

The errno I get is 2;

推荐答案

我的猜测是，该文件无法打开，而你还在它传递给与fgets。你如果（RD == NULL），如果是空的，它只是打印出一条消息，并继续执行不停止与fgets的执行。

My guess is that the file is failing to open, and you're still passing it to fgets. Your if(rd==NULL) doesn't stop execution of the fgets if it's null, it just prints out a message and continues with execution.

一些非常基本的errorr处理：

Some very basic errorr handling:

const char* frd = "word-list.txt";

FILE *rd=fopen(frd,"r");
if(rd==NULL) {
    std::cout<<"Coudn't open file"<<endl;
    return 1;
}

char readLine[100]; 
while(fgets(readLine, 100, rd) != NULL)
{     
    readLine[strlen(readLine) - 1] = '\0'; 
    char *token = NULL; 
    token = strtok(readLine, " ,"); 
    insert(readLine);
}

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