从BM读取数据

Question

#define bmpSIGNATURE  0X4D42 

unsigned short Get16U(unsigned int *x)
{
    unsigned short temp ;
    temp = *x & (0xFFFF);
    return temp;
}

unsigned int *bAddress,fdr;

void main()
{      
    disp_str("FILE OPEN",1,0);
    disp_rw_clr(2);
    bAddress = FILE_Open((void *)pUSBDevInfo, Directory[dir_cnt].FileName, RDONLY); // Read the file from USB and return start address
    /* read bmp  header */
    pFileheader->Type = Get16U(bAddress);               // save the first two bytes of bmp file data 
    (char*)bAddress++;
    (char*)bAddress++;                                  // increment the address by 2 bytes to reach address of "Filesize" parameter 
    if(pFileheader->Type == bmpSIGNATURE)               // read further bytes of the FILE header and INFO header only if the file is a bitmap 
    { 
        pFileheader->FileSize = Get32U(bAddress);       // save the filesize
        bAddress = bAddress + 2;                        // increment the address by 8 bytes to reach address of "offset" parameter
        pFileheader->PxOffset = Get32U(bAddress);       // save the offset
        bAddress++;                                     // increment the address by 4 bytes to reach address of "info header size" parameter
    }
}

好的，这是我编写的代码的一部分，用于在从USB驱动器打开后读取bmp文件头。在读取bmp部分中，我想将无符号整数指针bAddress递增一个字节，即作为字符指针((char*)bAddress++)，以便我将达到我想要读取的数据。现在（如果我将指针递增为(bAdress++)），我将得到错误的数据，因为地址将增加4个字节）。如果我使用(char*)bAddress++;

做了对错，我感到很困惑