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法学C 语言中 tmpfile() 函数
tmpfile() 函数在 C 中创建二进制更新模式的临时文件。它会在 C 程序的头文件里初始化。如果无法创建临时文件，它会始终返回一个空指针。程序终止后，临时文件会自动删除。
语法
FILE *tmpfile(void)
返回值
如果文件创建成功，该函数会返回一个流指针到创建的临时文件。如果无法创建文件，会返回空指针。
算法
Begin. Declare an array variable c[] to the character datatype and take a character data string. Initialize a integer variable i ← 0. Declare a newfile pointer to the FILE datatype. Call tmpfile() function to make newfile filepointer as temporary file. Call open() function to open “nfile.txt” to perform write operation using newfile file pointer. if (newfile == NULL) then print “Error in creating temporary file” . return 0. Print “Temporary file created successfully”. while (c[i] != '\0') do put all the data of c[] into the filepointer newfile. i++. Call fclose() function to close the file pointer. Call open() function to open “nfile.txt” to perform read operation using newfile file pointer. Call rewind() function to set the pointer at the beginning of the stream of the file pointer. while (!feof(newfile)) do call putchar() function to print all the data of file pointer newfile. Call fclose() function to close the file pointer. End.
示例
#include <stdio.h>
int main() {
char c[] = "Tutorials Point";
int i = 0;
FILE* newfile = tmpfile(); //make the file pointer as temporary file.
newfile = fopen("nfile.txt", "w");
if (newfile == NULL) {
puts("Error in creating temporary file");
return 0;
}
puts("Temporary file created successfully");
while (c[i] != '\0') {
fputc(c[i], newfile);
i++;
}
fclose(newfile);
newfile = fopen("nfile.txt", "r");
rewind(newfile); //set the pointer at the beginning of the stream of the file pointer.
while (!feof(newfile))
putchar(fgetc(newfile));
fclose(newfile); //closing the file pointer
}输出
Temporary file created successfully Tutorials Point
更新于：30-07-2019
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