退出while循环时，fscanf失败

Question

编辑:该问题与fscanf的while循环没有直接关系，而是在用于包含使用fscanf加载的变量的结构的分配中出现了错误

我正在从文件中读取值，并使用它们在使用fscanf的结构中设置参数。我使用Eclipse作为编辑器，并将其调试和gcc作为编译器（从Eclipse内部）。

我下面介绍的由三部分组成:1)我从文件中读入变量的结构的声明。2)我正在读取的文件，以及3)实际从文件中读取的代码。

在所有这些之下，有一个问题，不幸的是，这是一个相当具体的问题。但我越来越绝望了。

1）我正在阅读的结构声明如下：

struct StSimuParam{

    // Control parameters

    int HeatSource; // Kind of internal heat source? // 0: No internal heat source, 1: Constant internal heat source, 2: Varying internal heat source

    // Simulation parameters

    double TotTime;
    double dt;
    double CurrentTime;

    int TotIter; // Calculated as TotTime/dt
    double beta; // Weighting between forwards and backwards euler time scheme

    double TCastInit; // Initial casting temperature
    double TMouldInit; // Initial mould temperature

    // Physical parameters
    double Thickness; // Element thickness, constant for all elements
    double HeatCondNumber[3]; // Heat conduction number. Index 0: melt, index 1: solidified alloy, index 2: mould
    double Cp[3]; // Specific heat capacity. Index 0: melt, index 1: solidified alloy, index 2: mould
    double TConvec; // The temperature at infinity that controls the convection cooling
    double HeatTransfCoef; // Heat transfer coefficient.

    // Average density of element
    double *AvgRho;
    double *AvgCp;
    double *AvgHeatCondNumber;

    };

2） 我正在读取的文件是以下.txt文件

Input for thermal solver. Need descriptions of all quantities  

Thickness           0.01    Thickness of elements  

HeatCondNumLiq      100     Heat conduction number for liquid  
HeatCondNumSol      100     Heat conduction number for solid alloy  
HeatCondNumMould    10      Heat conduction number for mould  

CpLiq               500     specific heat capacity of liquid  
CpSol               500     specific heat capacity of solid alloy  
CpMould             50      specific heat capacity of mould  
TCastInit           1260    Casting initial temperature  
TMouldInit          20      Mould initial temperature  

TConvec             500     Convective cooling temperature (T_infinity)  

dt                  0.01    Time step size  
TotTime             0.04    Total time  
beta                0.5     Parameter for the time stepping proceedure (0.5 : Crank - Nicholson)  

HeatTransfCoef      50000   Heat transfer coefficient between mould and convectively cooling airInput for thermal solver. Need descriptions of all quantities

3）以下函数将文件中的值读入结构如下：

struct StSimuParam *set_simu_param(char *SimuParamFileName){

    struct StSimuParam *pStSimuParam =  malloc(sizeof(struct StBCData));

        FILE *fp;

        fp = fopen(SimuParamFileName,"r");

        if (fp == NULL){ // Check if file could be opened
                fprintf(stderr, "Can't open file %s!\n",SimuParamFileName);
                exit(EXIT_FAILURE);
        }



        char str1[50]; // string for comparison to struct element keywords
        char str2[20]; // string containing the value according to the keyword in str1

        while (fscanf(fp,"%s %s %*[^\n]",str1,str2) == 2){

            printf("str1: ");
            puts(str1);
            printf("str2: ");
            puts(str2);

            if (strcmp(str1,"Thickness") == 0){
                sscanf(str2, "%lf", &(pStSimuParam->Thickness));
                printf("Thickness = %f\n",pStSimuParam->Thickness);
            }
            else if (strcmp(str1,"HeatCondNumLiq") == 0){
                sscanf(str2, "%lf", &(pStSimuParam->HeatCondNumber[0]));
                printf("HeatCondNumber = %f\n",pStSimuParam->HeatCondNumber[0]);
            }
            else if (strcmp(str1,"HeatCondNumSol") == 0){
                sscanf(str2, "%lf", &(pStSimuParam->HeatCondNumber[1]));
                printf("HeatCondNumber = %f\n",pStSimuParam->HeatCondNumber[1]);
            }

            else if (strcmp(str1,"HeatCondNumMould") == 0){
                sscanf(str2, "%lf", &(pStSimuParam->HeatCondNumber[2]));
                printf("HeatCondNumber = %f\n",pStSimuParam->HeatCondNumber[2]);
            }

            else if (strcmp(str1,"CpLiq") == 0){
                sscanf(str2, "%lf", &(pStSimuParam->Cp[0]));
                //printf("RhoCp = %f\n",pStSimuParam->RhoCp);
            }

            else if (strcmp(str1,"CpSol") == 0){
                sscanf(str2, "%lf", &(pStSimuParam->Cp[1]));
                //printf("RhoCp = %f\n",pStSimuParam->RhoCp);
            }
            else if (strcmp(str1,"CpMould") == 0){
                sscanf(str2, "%lf", &(pStSimuParam->Cp[2]));
                //printf("RhoCp = %f\n",pStSimuParam->RhoCp);
            }

            else if (strcmp(str1,"beta") == 0){
                sscanf(str2, "%lf", &(pStSimuParam->beta));
                //printf("beta = %f\n",pStSimuParam->beta);
            }
            else if (strcmp(str1,"dt") == 0){
                sscanf(str2, "%lf", &(pStSimuParam->dt));
                //printf("dt = %f\n",pStSimuParam->dt);
            }

            else if (strcmp(str1,"TotTime") == 0){
                sscanf(str2, "%lf", &(pStSimuParam->TotTime));
                printf("TotTime = %f\n",pStSimuParam->TotTime);
            }

            else if (strcmp(str1,"HeatSource") == 0){
                sscanf(str2, "%d", &(pStSimuParam->HeatSource));
                //printf("HeatSource = %d\n",pStSimuParam->HeatSource);
            }

            else if (strcmp(str1,"TConvec") == 0){
                sscanf(str2, "%lf", &(pStSimuParam->TConvec));
                printf("TConvec = %f\n",pStSimuParam->TConvec);
            }

            else if (strcmp(str1,"HeatTransfCoef") == 0){
                sscanf(str2, "%lf", &(pStSimuParam->HeatTransfCoef));
                printf("HeatTransfCoef = %f\n",pStSimuParam->HeatTransfCoef);
            }

            else if (strcmp(str1,"TCastInit") == 0){
                sscanf(str2, "%lf", &(pStSimuParam->TCastInit));
            }

            else if (strcmp(str1,"TMouldInit") == 0){
                sscanf(str2, "%lf", &(pStSimuParam->TMouldInit));
            }

        }
fclose(fp);

    return pStSimuParam;
}

函数调用如下所示：

char SimuParamFileName[50]; 

sprintf(SimuParamFileName,"SimuParam_solidification.txt");


/****** Set simulation parameters for thermal solver  **************/

struct StSimuParam *pStSimuParam;
pStSimuParam = set_simu_param(SimuParamFileName);

问题在于，当 fscanf 读取字符串“TConvec”时，它会将读取值放入它应该读取的变量中，但随后退出 while 循环，即使尚未到达文件的末尾。我可以在包含 TConvec 的输入文件中的行周围移动，并且 while 循环在到达 TConvec 时仍然终止。

如果我将输入文件的TConvec部分放在文件末尾，调试器将在以下位置结束

/* We add the additional test for EOF here since otherwise
inchar will restore the old errno value which might be
EINTR but does not indicate an interrupt since nothing
was read at this time.  */
    if (__builtin_expect ((c == EOF || inchar () == EOF)

在弗夫斯坎夫。

当注释掉与TConvec相关的部分时，while循环以fscanf:

_IO_acquire_lock_clear_flags2（流）；

我看不到

else if (strcmp(str1,"TConvec") == 0){
    sscanf(str2, "%lf", &(pStSimuParam->TConvec));
    printf("TConvec = %f\n",pStSimuParam->TConvec);
}

与其他“其他如果”语句有很大不同，这里也可能有多个错误。非常感谢对此的任何帮助或想法！

Answer 1

正如@Strigidis在评论中指出的那样，我分配了错误使用的结构：

< code > struct StSimuParam * pStSimuParam = malloc(sizeof(struct STBC data))；

应该是

struct StSimuParam *pStSimuParam = malloc（sizeof（struct StSimuParama））;

不知何故，这导致了fscanf期间的错误。虽然我不确定为什么会这样...

Answer 2

我想我找到了问题所在，我的朋友。

听着，你的功能:

char str1[50]；//用于与结构元素关键字进行比较的字符串

你的声明很好，但在你的代码中我发现了问题：

< code>while (fscanf(fp，" % s % s %*[^\n]",str1,str2)= = 2){

如我所见，您的str1和str2都与==2进行了比较，并且您没有使用strlen来过滤字符串中的空字符。如果您尝试过，也许会解决问题。

另一点可能是你的%*[^\n]，当你比较时，这种格式可能会给str1和str2带来麻烦。

我希望能对这些提示有所帮助。如果可能，请回答我：您使用什么操作系统和复印机？它只是来自eclipse的GCC？