使用 EPL2 打印语言打印 bmp 文件时出现大黑线

问题描述

这是本主题的第三部分.第 1 部分、第 2 部分..

This is the 3rd part to this topic. Part 1, Part 2..

我能够成功地将我的单色位图打印到我的打印机，但是在打印项目时，图像右侧有一条大的黑色条纹.

I was successfully able to print my monochrome bitmap to my printer, however there is a large black stripe along the right of the image when the item prints.

这是原文

(Scanned in)打印机打印的内容

(Scanned in)What the printer printed

生成二进制 blob 的代码

Code to generate binary blob

Rectangle rect = new Rectangle(0, 0, Bitmap.Width, Bitmap.Height);
System.Drawing.Imaging.BitmapData bmpData = null;
byte[] bitVaues = null;
int stride = 0;
try
{
    bmpData = Bitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadOnly, Bitmap.PixelFormat);
    IntPtr ptr = bmpData.Scan0;
    stride = bmpData.Stride;
    int bytes = bmpData.Stride * Bitmap.Height;
    bitVaues = new byte[bytes];
    System.Runtime.InteropServices.Marshal.Copy(ptr, bitVaues, 0, bytes);
}
finally
{
    if (bmpData != null)
        Bitmap.UnlockBits(bmpData);
}

string str = String.Format("GW{0},{1},{2},{3},", X, Y, stride, Bitmap.Height);
byte[] ascii = Encoding.ASCII.GetBytes(str);
byte[] buffer = new byte[ascii.Length + bitVaues.Length + 1];
Buffer.BlockCopy(ascii, 0, buffer, 0, ascii.Length);
Buffer.BlockCopy(bitVaues, 0, buffer, ascii.Length, bitVaues.Length);
buffer[buffer.Length - 1] = (byte)'
';
return buffer;

我最初的理论是 BMP 格式将该行添加为行尾标记，并且在呈现时不可行.我想在我拥有二进制数组并取出每行末尾的 00 00 00 后，我可能必须重新解析文件.但我在这里发帖以防万一有人想到更好的方法.

My initial theory is the BMP format is adding that line as a end of line marker and is not viable when rendered. I am thinking I may have to reparse the file after I have the binary array and take out the 00 00 00 at the end of every line. But I am posting here in case anyone thinks of a better way.

推荐答案

Microsoft 位图始终填充为偶数 32 位.生成位图时，将宽度四舍五入到 32 的倍数就可以了.

Microsoft bitmaps are always padded to an even 32 bits. When you generate the bitmap, round the width up to a multiple of 32 and you should be fine.