如何通过tcp发送unsigned char？ [英] How to send unsigned char over tcp ?

问题描述

我需要帮助在unix中通过tcp发送无符号字符

但是这行中的大小写错误

i need help to send unsigned character over tcp in unix
but it case error in this line

void Write(char * a,int size)
{
  unsigned char dt []=a;// erorr
  write(Socket,a,2); // error
 
}

推荐答案

只需将文件描述符 arr 和 size 传递给写函数。只要count参数指定缓冲区中包含的有效字节数，缓冲区指针的类型就不在乎了。另请参见 man 2 write [ ^ ]。



write函数只传输数据。它不关心传输什么类型的数据。因此，第二个参数的类型是 void * 。

Just pass the file descriptor, arr and size to the write function. The type of the buffer pointer does not care as far as the count parameter specifies a valid number of bytes contained in the buffer. See also man 2 write[^].

The write function just transfers data. It does not care what kind of data are transferred. For that reason the type of the second parameter is void *.

在内部，有符号和无符号类型是相同的。你发送的char只是8位数据，就像unsigned char一样。因此，

Internally, a signed and an unsigned type are the same. The char you send is just 8 bits of data, just like an unsigned char. Therefore,

void Write(char * arr,int size)
{
  unsigned char* dt = (unsigned char*)a; // Cast to the type you want
  write(Socket,dt,size);
}

将发送与

will send exactly the same data as

void Write(char * arr,int size)
{
  write(Socket,arr,size);
}

我暂时解决这个问题

i solve it temporary like this

void WriteU(unsigned   char buff[], int size)
{
    int h ;

        h = write( m_Client->Socket,buff,size);
//          printf("\n data write \n %i",h);

}

如果有其他方式我为什么厌倦了自己？

why i tired my self if there is another way

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