为什么fopen（）返回一个空指针？

我试图在cont_br和cont_lan中的BRIDGE之后和局域网（分别为4和5）之后保存参数，但fopen（）不起作用…

#include  #include  #include  #include  void read_file(char file[]) { char cont, *str, *ctrl_str; int x=0, cont_br, cont_lan; FILE *file_stream; if (file_stream = fopen(file, "r")) { while( !feof(file_stream) ) { //Check the file dimension fgetc( file_stream ); x++; } x--; str = (char*) malloc(sizeof(char) * x+1); fseek(file_stream, 0, SEEK_SET); // Return at the beginning of the file fread(str, x, 1, file_stream); char delims[] = "#"; char *result = NULL; result = strtok( str, delims); while (result != NULL) { if (result == "BRIDGE") { //Check the different "blocks" in the txt file result = strtok(NULL, delims); cont_br = atoi(result); printf("Number of bridges: %dn", cont_br); } result = strtok(NULL, delims); if (result == "LAN") { result = strtok(NULL, delims); cont_lan = atoi(result); printf("Number of Lan: %dn", cont_lan); } break; // } } printf("Error: can't open the file! errno: %dn", errno); fclose(file_stream); } int main() { char file[] = "Config.txt"; read_file(file); return 0; } 

这是Config.txt文件：

 BRIDGE#4# LAN#5# 192.168.0.1 192.168.1.1 192.168.2.1 192.168.3.1 192.168.4.1 # LINK# B1:3000,L1 B1:3001,L2 B1:3002,L3 B2:3000,L4 B2:3001,L5 B3:3000,L1 B4:3000,L3 B5:3000,L2 B2:3002,L3 

 #include  

 #include  #include  int main() { errno = 0; FILE *fb = fopen("/home/jeegar/filename", "r"); if (fb==NULL) { printf("Error %d n", errno); printf("It's null"); } else printf("working"); } 

以上就是c/c++开发分享C – fopen（）不起作用（返回空指针）相关内容,想了解更多C/C++开发(异常处理)及C/C++游戏开发关注计算机技术网(www.ctvol.com)!)。