这段代码打开一个目录，对于目录中的每个文件，它循环遍历文件内的每一行数据，然后解析它以进行一些计算，并将结果数据输出到一个新文件中。
问题是我最多只能输出大约 1021 个文件。输出所有数据后，我将关闭所有 fopens，所以我不确定我做错了什么。
不应该 fclose() 关闭打开的文件，因此不会发生这种情况吗？
int main(int argc, char *argv[])
{
//sample data values
double lat;
double lon;
double convergence;
double pt_scale;
int zone = 54;
double major_axis = 6378137.0000;
double flattening = (1/298.2572);
double zoneWidth = 6;
double centMeridian = -177;
double falseEast = FALSE_EASTING;
double falseNorth = FALSE_NORTHING;
double scale = SCALE_FACTOR;
int max_size = 128;
int current_size = max_size;
char *pathStr = malloc(max_size);
char *outPathStr = malloc(max_size);
char coData[100]; //max length of line;
long firstTerm, secondTerm; //terms we will split the line into, lat, lon, elevation.
int counter = 0; //pos counter
int d = EOF; //end of file ASCII
char strIn[200];
char* elevation;
char strOut[200];
char dirOut[200]; //sprintf must use a actual defined buffer otherwise there will be a buffer overflow.
char* cchr;
int j;
_setmaxstdio(2048);
printf("Please enter the path of the files: \n");
getUserInput(pathStr, current_size, max_size);
printf("Please enter the output path of the files: \n");
getUserInput(outPathStr, current_size, max_size);
//loop through each file in the directory. Open the file, convert, then close it.
//we will use dirent.h as it is cross platform so we wont have to worry about sharing issues
DIR *dir; //new directory
struct dirent *ent;
dir = opendir(pathStr); //allcate it a path
if(opendir(pathStr) == NULL)
{ printf("Error: %d (%s)\n", errno, strerror(errno));}
int k;
if(dir != NULL)
{
while((ent = readdir(dir)) != NULL) //loop through each file in the directory.
{
//open the file and loop through each line converting it then outputing it into a new file
if((!strcmp(ent->d_name,"..") || !strcmp(ent->d_name,".")) == 1)
{
//dont want these directories
continue;
}
else
{
sprintf(strIn,"%s%s",pathStr,ent->d_name); //get the file n
FILE *fp = fopen(strIn, "r");
if(fopen(strIn, "r") == NULL) //for inputting file
{ printf("Error: %d (%s)\n", errno, strerror(errno));
getchar();
break; }
sprintf(dirOut,"%s%d%s",outPathStr,counter,".geo");
printf("%s \n",dirOut);
FILE *fp2 = fopen(dirOut, "w"); //for outputting file
if(fopen(dirOut, "w") == NULL)
{ printf("Error: %d (%s)\n", errno, strerror(errno));
getchar();
break; }
while(fgets(coData, 100, fp) != NULL)//loop through line by line, allocate into 2 doubles and a string, pass the two coordinates and convert
{
//extract terms from coData
char * pch; //pointer to array pos
char * pend;
pch = strtok(coData," ");
j = 0;
while(j <= 2) //We only want to split the first three parameters.
{
//convert char array to double for co-oridinate conversion
if(j == 0)
{
firstTerm = atof(pch); //latitude;
j++;
continue;
}
if(j == 1)
{
pch = strtok(NULL, " ");
secondTerm = atof(pch); //longitude
j++;
continue;
}
if(j == 2)
{
pch = strtok(NULL," ");
elevation = pch; //elevation doesnt need to be converted because it isnt used in the coordinate conversion.
break;
}
}
grid2spheroid(&lat,&lon,&convergence,&pt_scale,firstTerm,secondTerm,zone,0, major_axis,flattening,zoneWidth,centMeridian,falseEast,falseNorth,scale);
sprintf(strOut,"%f %f %s",lat,lon,elevation);
//printf("%d %d", lat, lon);
fputs(strOut,fp2);
} //end of while
fclose(fp2);
fclose(fp);
counter++;
}
}
closedir(dir);
}
free(pathStr); //finished using the path string so we can finish the
free(outPathStr);
getchar();
return 0;
}
void getUserInput(char *pathStr, int current_size, int max_size)
{
unsigned int i = 0;
if(pathStr != NULL)
{
int c = EOF;
//get the user input and reallocate the memory size if the input it too large.
while((c = getchar()) != '\n' && c != EOF) //WHILE NOT END OF FILE OR NEW LINE (USER PRESSED ENTER)
{
pathStr[i++] = (char)c;
if(i == current_size)
{
current_size = i+max_size;
pathStr = realloc(pathStr, current_size);
}
}
}
}
最佳答案
您没有关闭所有文件;-)
FILE *fp = fopen(strIn, "r");
if(fopen(strIn, "r") == NULL) //for inputting file
这同样适用于您的输出。
我认为你的意思更像是:
FILE *fp = fopen(strIn, "r");
if(fp == NULL) //for inputting file
{
// error handling.
关于C:打开的文件太多，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11446000/