使用套接字发送文件

发布于 2024-11-07 14:02:48 字数 725 浏览 0 评论 0原文

我正在尝试创建一个基本的 HTTP 服务器以了解有关其工作原理的更多信息。我在向客户端发送二进制文件时遇到困难。我的代码如下：

char * buffer = (char *)malloc(sizeof(char) * 512);
fseek(content_file, 0, SEEK_SET);
while (!feof(content_file)) {
    size_t read = fread(buffer, sizeof(char), sizeof(buffer), content_file);
    if (read > 0) {
        client->send((const void *)buffer);
    }
}
fclose(content_file);
free(buffer);

现在我知道它可以在读取最后一个块后发送一些不必要的数据，但在尝试修复它之前，我想知道它出了什么问题。它对于文本文件工作得很好，我正在使用 fgets。但切换到 fread 支持二进制文件后，文本文件被损坏并变成这样： ThisÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ（“This”是发送数据中唯一正确的部分）

显然我错过了一些东西，但你能帮我正确地做到这一点吗？

编辑：

使用 buffer_size 值而不是 sizeof(buffer) 修复了丢失/损坏的数据问题。

原文

I'm trying to create a basic HTTP server to learn more about how it works. I'm having difficulties with sending binary files to the client. My code is as below:

char * buffer = (char *)malloc(sizeof(char) * 512);
fseek(content_file, 0, SEEK_SET);
while (!feof(content_file)) {
    size_t read = fread(buffer, sizeof(char), sizeof(buffer), content_file);
    if (read > 0) {
        client->send((const void *)buffer);
    }
}
fclose(content_file);
free(buffer);

Now I know it can send some unnecessary data after the last block read but before trying to fix it, I want to know what's wrong with it. It was working fine for text files and I was using fgets. But after switching to fread to support binary files, text files are corrupted and became something like this: ThisÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ ("This" is the only correct part in the sent data)

Obviously I'm missing something but can you please help me to do this correctly?