如何在c中读取二进制文件？ （视频、图像或文字）
我正在尝试将文件从指定的库复制到当前目录。我可以完美地复制文本文件。任何其他文件都会损坏。程序提前检测到 feof。
#include <stdio.h>
int BUFFER_SIZE = 1024;
FILE *source;
FILE *destination;
int n;
int count = 0;
int written = 0;
int main() {
unsigned char buffer[BUFFER_SIZE];
source = fopen("./library/rfc1350.txt", "r");
if (source) {
destination = fopen("rfc1350.txt", "w");
while (!feof(source)) {
n = fread(buffer, 1, BUFFER_SIZE, source);
count += n;
printf("n = %d\n", n);
fwrite(buffer, 1, n, destination);
}
printf("%d bytes read from library.\n", count);
} else {
printf("fail\n");
}
fclose(source);
fclose(destination);
return 0;
}
I am trying to copy a file from a specified library to the current directory. I can copy text files perfectly. Any other files become corrupt. The program detects a feof before it should.
#include <stdio.h>
int BUFFER_SIZE = 1024;
FILE *source;
FILE *destination;
int n;
int count = 0;
int written = 0;
int main() {
unsigned char buffer[BUFFER_SIZE];
source = fopen("./library/rfc1350.txt", "r");
if (source) {
destination = fopen("rfc1350.txt", "w");
while (!feof(source)) {
n = fread(buffer, 1, BUFFER_SIZE, source);
count += n;
printf("n = %d\n", n);
fwrite(buffer, 1, n, destination);
}
printf("%d bytes read from library.\n", count);
} else {
printf("fail\n");
}
fclose(source);
fclose(destination);
return 0;
}
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您使用的是 Windows 机器吗？尝试将“b”添加到调用
fopen的模式字符串中。来自 man fopen(3)：
Are you on a Windows machine? Try adding "b" to the mode strings in the calls to
fopen.From man fopen(3):
您需要为
fopen指定"b"选项：如果没有它，文件将以文本 (
"t") 模式打开，并且这会导致行尾字符的翻译。You need to specify the
"b"option tofopen:Without it, the file is opened in text (
"t") mode, and this results in translation of end-of-line characters.您需要以二进制格式而不是文本格式打开文件。在调用
fopen时，使用"rb"和"wb"而不是"r"和“w”分别。You need to open the files in binary format rather than text format. In your calls to
fopen, use"rb"and"wb"rather than"r"and"w"respectively.