用C读取二进制文件(以块为单位)

Question

我不擅长C而且我想做一些简单的事情.我想打开一个二进制文件,读取1024字节数据的块并转储到缓冲区,处理缓冲区,读取另外1024个数据的数据并继续这样做直到EOF.我知道如何/我想用缓冲区做什么,但它是循环部分和文件I/OI一直卡在上面.

PSEUDO代码:

FILE *file;
unsigned char * buffer[1024];

fopen(myfile, "rb");

while (!EOF)
{
  fread(buffer, 1024);
  //do my processing with buffer;
  //read next 1024 bytes in file, etc.... until end
}

Answer 1

fread()返回读取的字节数.你可以循环直到0.

FILE *file = NULL;
unsigned char buffer[1024];  // array of bytes, not pointers-to-bytes
size_t bytesRead = 0;

file = fopen(myfile, "rb");   

if (file != NULL)    
{
  // read up to sizeof(buffer) bytes
  while ((bytesRead = fread(buffer, 1, sizeof(buffer), file)) > 0)
  {
    // process bytesRead worth of data in buffer
  }
}