发送文件与插座 [英] Sending Files With Sockets

问题描述

我正在尝试创建一个基本的HTTP服务器，以了解更多有关它的工作原理。我有困难，发送二进制文件到客户端。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）; 
  

现在我知道它可以发送一些不必要的数据，最后一个块读取之后，我想知道它有什么问题。它工作正常的文本文件，我使用的是fgets。但是在切换到fread以支持二进制文件后，文本文件已损坏，并且变成这样：这个是已发送数据中唯一正确的部分（This p>

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 值代替 sizeof（buffer）

你的问题是 sizeof（buffer） c>给你指针的大小，而不是它指向的大小。

添加一个 buffer_size malloc 和已释放。

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?

Edit:

Using a buffer_size value instead of sizeof(buffer) fixed the missing/corrupted data problem.

解决方案

You problem is that sizeof(buffer) gives you the size of the pointer, not what it points to.

Add a buffer_size and use that both for malloc and freed.

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