fgets

问题 I am in process of rewriting some scripts to parse machine generated logs from perl to php The files range from 20mb~400mb I am running into this problem to decide if I should use file() or fopen()+fgets() combo to go through the file for some faster performance. Here is the basic run through, I check for file size before opening it, and if file is larger than 100mb(pretty rare case, but it does happen from time to time) I will go the fopen+fgets route since I only bumped the memory limit for

问题 I need to read a text file, and then print the results out. I am using a struct to hold the variables, and I do not need to create an array. The problem is that the code seems to either not be reading the second line or I'm printing incorrectly, and the results are completely jumbled. Here is the text file: UTSA01 8 0 150.00 80.00 Armadillos,utsa@xyz.com,(210)555-1111,Jean E Us COM001 7 1 150.00 75.00 Comm Eagles,maeking@xyz.com,(210)555-2222,Mae King SOUTH1 5 3 120.00 75.00 Slam Dunk

问题 How does one check the read in string for a substring in C? If I have the following char name[21]; fgets(name, 21, stdin); How do I check the string for a series of substrings? How does one check for a substring before a character? For example, how would one check for a substring before an = sign? 回答1: Be wary of strtok() ; it is not re-entrant. Amongst other things, it means that if you need to call it in one function, and then call another function, and if that other function also uses

问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: Dev-C++ Input skipped I am trying to read an array of character strings from stdin using fgets, but the first string I want to read is always ignored. What is causing this issue? #include <stdio.h> int main() { int i; struct material { char name[30]; float price, kg; }; unsigned m,nr; printf("Lorry capacity="); scanf("%u", &m); printf("Number of materials="); putchar('\n'); scanf("%u", &nr); struct material list

问题 When I search using keywords of 'fgets' and 'newline', there are many posts regarding how to remove the trailing newline character (and such removal appears to be a burden). Yet it seems there is few explaination on how that newline is necessary for fgets to include. Also in C++, the 'std::getline' and 'std::istream:getline' methods will not keep the newline character. So is there a reason for it? 回答1: Here is satisfying (IMHO) explanation: http://www.cplusplus.com/reference/cstdio/fgets/

问题 I'm developing firefox plugin and I want to read file using WinApi. I manage to connect with WinApi and it works fine. var lib = ctypes.open("user32.dll"); var msgBox = lib.declare("MessageBoxW", ctypes.winapi_abi, ctypes.int32_t, ctypes.int32_t, ctypes.jschar.ptr, ctypes.jschar.ptr, ctypes.int32_t); var MB_OK = 0; var ret = msgBox(0, "Hello world", "title", MB_OK); Now I declare fopen : const FILE = new ctypes.StructType("FILE").ptr; var fopen = libc.declare("fopen", // symbol name ctypes

问题 I am trying to write a program in c wherein I can control the while loop execution through user input from stdin. I have done it successfully through scanf and getchar functions. Now I am trying to replicate this using the fgets() function which is widely recommended to use rather than scanf() function. I wrote the following code: #include<stdio.h> #include<string.h> int main() { char loop[4]= "yes"; printf("%s\n",loop); while(strcmp(loop,"yes")==0) { printf("Do you want to continue? [yes|no]

问题 I have a C program with two threads one of those threads is almost all the time blocked in a fgets() waiting for user input. The second thread may need to print to the terminal while the first one is blocked on fgets() . From my tests it seems that the program waits for the fgets() on the first thread to return and then the second thread can print. Is this who it works or could I print while the the other thread is blocked on the fgets() ? This implementations runs on eCos (embedded

问题 I'm trying to execute a command line from my C code, but when I get to the fgets() function, I got a NULL error. void executeCommand(char* cmd, char* output) { FILE *fcommand; char command_result[1000]; fcommand = popen(cmd, "r"); if (fcommand == NULL) { printf("Fail: %s\n", cmd); } else { if (fgets(command_result, (sizeof(command_result)-1), fcommand) == NULL) printf("Error !"); strcpy(output, command_result); } pclose(fcommand); } And my command is: java -jar <parameters> Why do I have a

问题 I am parsing emails with Zend_Mail, and strangely some content gets truncated without an obvious reason and malforms the email parts. For example Content-Disposition: attachment; filename="file.sdv" DQogICAgICBTT05FO0xBTkRJTkdTREE7U0FMR1NEQVRPIDtOQVNKIDtSRURTS0FQICAgICAgICAg ICAgIDsgRklTS0VTTEFHO1BSRVNFUlYgICA7ICBUSUxTVEFORDsgU1TYUlJFTFNFOyAgS1ZBTElU RVQ7T01TVFlQRSAgO01JTlNURVBSSVM7ICAgICBWRVJESTsgICBLVkFOVFVNOyAgUlVORFZFS1Qg