Question

I want to print *.bmp to a receipt printer. for that I am reading pixel values (hex) inside a loop and then I need to append the read values with the printer command to print then write to the printer. printer api accepts only unsigned char. now I got the pixel values writing to a temp file. How to construct a unsigned char array with printer commands.

unsigned char printcommand [] = { 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67 };

int len=sizeof(printcommand)/sizeof(unsigned char);
printf("Length Of Array=%d\n", len);

result = C56_api_printer_clear (iPrinter);


/*----------READ RASTER DATA----------*/
for(r=0; r<=originalImage.rows - 1; r++) {
    for(c=0; c<=originalImage.cols - 1; c++) {
        /*-----read data and print in (row,column) form----*/
        fread(pChar, sizeof(char), 1, bmpInput);
                // here instead of writing to file i need to append to printercommand[]
        fprintf(rasterOutput, "0x%x,", *pChar);
    }
        // here i need to write to the printer as C56_api_printer_write(iPrinter, printcommand, sizeof(printcommand), 1000);
    fprintf(rasterOutput, "\n");
}

// close the printer

Any idea How to do this in C?

Thanks in advance for all your help.

Answer 1

What you should do is find the width and height of the bitmap and then malloc a width*height block of memory, then just set each index to the proper value.

What format does the printer take for printing? Letters? bit packed chars? Also what type of bitmap are you using? 1 bit? 24 bit?