fwrite | 易学教程

PHP adding $ signs into strings without it being a variable? [duplicate]

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问题 This question already has answers here : Dollar ($) sign in password string treated as variable (8 answers) Closed 3 years ago . I'm making a setup page where people can write their database login etc and that will then create a config.php file on their webserver with the info but obviously I can't just write $file = fopen("config.php", "w"); fwrite($file, "$dbName = $dbName"); I actually tried $file = fopen("config.php", "w"); fwrite($file, "$" . "dbName = $dbName"); But that doesn't work

How to read particular data from file using fread?

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问题 Following code writes data of student into a file using fwrite and reads data using fread: struct record { char name[20]; int roll; float marks; }student; #include<stdio.h> void main() { int i; FILE *fp; fp=fopen("1.txt","wb"); //opening file in wb to write into file if(fp==NULL) //check if can be open { printf("\nERROR IN OPENING FILE"); exit(1); } for(i=0;i<2;i++) { printf("ENTER NAME, ROLL_ NO AND MARKS OF STUDENT\n"); scanf("%s %d %f",student.name,&student.roll,&student.marks); fwrite(

How much of a thread's code get executed ever time it is scheduled?

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问题 I have 3 threads in my program t1 reads a frame1 of data and writes it onto a hard disk t2 reads a frame2 of data and writes it onto a hard disk t2 reads a frame3 of data and writes it onto a hard disk When the program runs, and t1 t2 and t3 are scheduled for execution one by one, how are the operations performed internally? Ex: say t1 -> t2 -> t3 get scheduled in this order Scenario 1: will t1 finish one full cycle of read frame1 and write frame1 before t2 is scheduled and whether t2

Replace a particular line in a text file using php?

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问题 I have a text file that stores lastname, first name, address, state, etc as a string with a | delimiter and each record on a separate line. I have the part where I need to store each record on a new line and its working fine; however, now I need to be able to go back and update the name or address on a particular line and I can't get it to work. This how to replace a particular line in a text file using php? helped me here but I am not quite there yet. This overwrites the whole file and I

Reading and writing 64bits by 64 bits in C

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问题 I have this super simple code where I read blocks of 8 bytes (I will encrypt them later in the code) and then write them down in a new file. It works well but for the last 8 bytes which don't get written. Any idea why? #include <stdbool.h> #include <stdlib.h> #include <stdio.h> #include <stdint.h> int main() { uint64_t data; FILE *input, *output; // create output file output = fopen("output.txt", "w"); // read file input = fopen("test.txt", "rb"); if(input) { while(fread(&data, 8, 1, input) =

Creating a PDF. How can I get this working? Errors populating

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问题 Below is my php script that parses data and returns it on a webpage. I've attempted to integrate code with the TCPDF library, but I can't seem to get it to work. I'd like to generate a pdf file that automatically saves to my desktop. Here is my code:  <?php $bg = "bg-body.png"; ?> <html> <style type="text/css"> body { background-image: url('<?php echo $bg;?>'); background-repeat: repeat; background-position: top center; } </style> <meta http-equiv=

C function fwrite() doesn't write in file

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问题 I'm trying to write structures from tempGroupFile into GroupFile . fwrite() returns 1, when writing, but actually no data is written in the file GroupFile . Function printRec() prints out the structure on the screen. data is a variable of structure. File GroupFile is empty after these operations. Code: GWTemp = fopen(tempGroupFile, "rb"); GW = fopen(GroupFile, "wb"); if((GW == NULL) || (GWTemp == NULL)) { puts("Failed to open file."); fflush(stdin); getchar(); return 0; } while(fread(&data,

fwrite writes garbage value to file

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问题 #include <stdio.h> struct struct_type { int d; }; int main() { struct struct_type *cust; cust->d=13; FILE* fp; fp = fopen("path to file", "wb+"); or, fp = fopen("path to file", "w+"); fwrite(cust, sizeof(struct struct_type), 1, fp); fclose(fp); return 0; } Expected output 13 However getting garbage value written to file. 回答1: Assuming you had allocated memory for cust , or used a plain struct instead of a pointer, you'd get a file that contains the binary representation of the int 13 on your

Waiting for command to finish using SSH2_Shell in PHP

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问题 I have an SSH2_Shell session working in PHP. my issue is that i need a command to completely finish before moving onto the next command. Here is my code so far: $command_capture = "cd /mnt/NADS/scripts/"; $command_capture2 = "./tcpdump.sh $capture_name $sleep"; if (!($connection = ssh2_connect("172.20.1.18", 22))) { echo "fail: unable to establish connection"; } if (!ssh2_auth_password($connection, "root", "Hideandseek")) { echo "fail: unable to authenticate"; } $stream = ssh2_shell(

Writing a linked list to binary file(C)

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问题 So I have set up a linked list and read data from a file, done some calculation and manipulation and now I want to store the new list into a binary file. Here is my struct setup: typedef struct Comp{ char name[5]; char node1[5], node2[5]; float value; //value }ComponentType; typedef struct ListNodeT{ ComponentType Component; float voltage, power, current; struct ListNodeT *nextPtr; }ListNodeType; In a separate function I am trying to write to a a file: FILE *filePtr; char fileName[13] =