在这里我们将看到一些在C语言中的基本文件处理操作。以下是这些操作的列表：
- 向文件中写入内容
- 从文件中读取内容
- 在文件中追加内容
向文件中写入内容
请参考以下代码以了解如何向文件中写入内容
示例代码
#include
int main() {
FILE *fp;
char *filename = "sample.txt";
char *content = "Hey there! You've successfully created a file with content in c programming language.";
/* open for writing */
fp = fopen(filename, "w");
if( fp == NULL ) {
printf("%s: failed to open.
", filename);
return -1;
} else {
printf("%s: opened in write mode.
", filename);
}
/* Write content to file */
fprintf(fp, "%s
", content);
if( !fclose(fp) )
printf("%s: closed successfully.
", filename);
return 0;
}
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输出
sample.txt: opened in write mode.
sample.txt: closed successfully.
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2.从文件中读取
查看代码以了解我们如何从文件中读取
创建一个文件（file_read.txt）：
您使用C编程语言打开了一个只读模式的文件。
示例代码
#include
int main() {
FILE *fp;
char *filename = "file_read.txt";
char ch;
/* open for writing */
fp = fopen(filename, "r");
if (fp == NULL) {
printf("%s does not exists
", filename);
return;
} else {
printf("%s: opened in read mode.
", filename);
}
while ((ch = fgetc(fp) )!= EOF) {
printf ("%c", ch);
}
if (!fclose(fp))
printf("
%s: closed.
", filename);
return 0;
}
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输出
file_read.txt: opened in read mode.
You have opened a file using C programming language, in read-only mode.
file_read.txt: closed.
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3.将内容追加到文件中
查看代码以了解如何将行追加到文件中的方法。
创建文件（file_append.txt）
This text was already there in the file.
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示例代码
#include
int main() {
FILE *fp;
char ch;
char *filename = "file_append.txt";
char *content = "This text is appeneded later to the file, using C programming.";
/* open for writing */
fp = fopen(filename, "r");
printf("
Contents of %s -
", filename);
while ((ch = fgetc(fp) )!= EOF) {
printf ("%c", ch);
}
fclose(fp);
fp = fopen(filename, "a");
/* Write content to file */
fprintf(fp, "%s
", content);
fclose(fp);
fp = fopen(filename, "r");
printf("
Contents of %s -
", filename);
while ((ch = fgetc(fp) )!= EOF) {
printf ("%c", ch);
}
fclose(fp);
return 0;
}
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输出
Contents of file_append.txt -
This text was already there in the file.
Appending content to file_append.txt...
Content of file_append.txt after 'append' operation is -
This text was already there in the file.
This text is appeneded later to the file, using C programming.
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