一种方法是对文件大小进行统计,将 std::string 和 fread() 的大小调整为 std::string 的 const_cast<char*>() 'ed data() 。这要求 std::string 的数据是连续的,这是标准不需要的,但似乎是所有已知实现的情况。更糟糕的是,如果在文本模式下读取文件,则 std::string 的大小可能与文件大小不同。 一个完...
1, 5, fp) != 5) { perror("Error reading from file");fclose(file);return 1;} // 在读取的字符串末尾添加字符串结束符 buf[5] = '\0';// 输出读取的字符串 printf("Read string: %s\n", buf);// 关闭文件 fclose(fp);return 0;} “r+”：read & update mode ,读取和更新模式 ...
Filename : ReadTextFilePerLine.cpp Compiler : Visual C++ 8.0 / ISO C++ Description : Demo how to read text file per line Release : 10/15/2006 */ #include<iostream> #include<fstream> #include<string> usingnamespacestd; intmain() { ifstream inFile("books.txt"); stringline; while(getlin...
{ // printf("close file failed\n"); perror("close file failed\n"); } } int main2() { int rows_size, cols_size = 5; FILE *fp = NULL; char *sFileName = "D:/WolfCode/c-learn/data.dat"; fp = fopen(sFileName, "r"); // open file and read data to get the rows_size...
使用ReadFile函数从文件读取数据: #include <windows.h> #include <stdio.h> int main() { HANDLE fileHandle = CreateFile("example.txt", GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); if (fileHandle == INVALID_HANDLE_VALUE) { printf("Failed to open file...
// struct to file #include <stdio.h> #include <stdlib.h> #include <string.h> // a struct with 3 fields to read and write struct roster { long id; //try int id; you can see the sizeof(struct ) shrink to 44 char fname[20]; // instead of 48. 8+20+20 = 48 ...
int fputs ( const char * str, FILE * stream )//代码展示 int main(){ FILE* pf = fopen("...
To make use of this feature, specify a as a length modifier (thus %as or %a[range]). The caller must free(3) the returned string, as in the following example:char *p;int n;errno = 0;n = scanf("%a[a-z]", &p);if (n == 1) { printf("read: %s\n", p); free(p);}...
compare data compare facility compare file compare full word compare instruction compare logic compare logical compare more files yn comparer compare shift unit compare track comparev compare with or make compare word string compare zone equal compare zone unequal comparing comparing brush comparing control...
comparativesandsuperl comparatorcheck compare ok compare our prices compare string instru compare the two trans compareto compared with foreign compared with other c compared with others compared with traditi comparelogicalregiste compari ati gpus comparing check comparing tasks comparision of gated compariso...