我有一个 Apex3,我已经能够毫无问题地遵循大多数文档,但是当涉及到图像时,事情变得非常奇怪(缺乏示例 + 缺乏一致性)。
首先,我尝试使用以下命令尝试通过 JPEG 和 0 质量压缩的 Bitmap byte[] 数组压缩的天真方法,因为我不介意:
ESC V n1 n2 数据
结果并不好。
然后我发现有一个用于 apex3 的 android 库,它接受位图并假设打印它,但它不能只打印像这样的奇怪符号:
我尝试使用 JD gui 解码 jar 源,他们似乎对位图字节做了一些工作,这是他们的代码(一条建议代码,如 addToDoc(m_Document, ESC + "B"); 只需将代码放在 ByteArrayOutputStream 中数据),(来自这里的反编译源):
public void writeImage(Bitmap imageObject, int printHeadWidth)
throws IllegalArgumentException
{
if (imageObject == null) {
throw new IllegalArgumentException("Parameter 'imageObject' was null.");
}
if (printHeadWidth < 1) {
throw new IllegalArgumentException("Parameter 'printHeadWidth' must be greater than 0.");
}
int height = imageObject.getHeight();
int width = imageObject.getWidth();
byte blanklineCount = 0;
byte[] dataline = new byte[printHeadWidth + 7 >> 3];
int[] imageData = new int[height * width];
imageObject.getPixels(imageData, 0, width, 0, 0, width, height);
addToDoc(m_Document, ESC + "B");
for (int row = 0; row < height; row++)
{
boolean blankLine = true;
for (int index = 0; index < width; index += 8)
{
byte currentByte = 0;
int offset = row * width + index;
if (index >= printHeadWidth) {
break;
}
int value = index + 0 < width ? imageData[(offset + 0)] & 0xFFFFFF : 16777215;
boolean set = (value >> 0 & 0xFF) + (value >> 8 & 0xFF) + (value >> 16 & 0xFF) < 384;
currentByte = (byte)(currentByte | (set ? -128 : 0));
value = index + 1 < width ? imageData[(offset + 1)] & 0xFFFFFF : 16777215;
set = (value >> 0 & 0xFF) + (value >> 8 & 0xFF) + (value >> 16 & 0xFF) < 384;
currentByte = (byte)(currentByte | (set ? 64 : 0));
value = index + 2 < width ? imageData[(offset + 2)] & 0xFFFFFF : 16777215;
set = (value >> 0 & 0xFF) + (value >> 8 & 0xFF) + (value >> 16 & 0xFF) < 384;
currentByte = (byte)(currentByte | (set ? 32 : 0));
value = index + 3 < width ? imageData[(offset + 3)] & 0xFFFFFF : 16777215;
set = (value >> 0 & 0xFF) + (value >> 8 & 0xFF) + (value >> 16 & 0xFF) < 384;
currentByte = (byte)(currentByte | (set ? 16 : 0));
value = index + 4 < width ? imageData[(offset + 4)] & 0xFFFFFF : 16777215;
set = (value >> 0 & 0xFF) + (value >> 8 & 0xFF) + (value >> 16 & 0xFF) < 384;
currentByte = (byte)(currentByte | (set ? 8 : 0));
value = index + 5 < width ? imageData[(offset + 5)] & 0xFFFFFF : 16777215;
set = (value >> 0 & 0xFF) + (value >> 8 & 0xFF) + (value >> 16 & 0xFF) < 384;
currentByte = (byte)(currentByte | (set ? 4 : 0));
value = index + 6 < width ? imageData[(offset + 6)] & 0xFFFFFF : 16777215;
set = (value >> 0 & 0xFF) + (value >> 8 & 0xFF) + (value >> 16 & 0xFF) < 384;
currentByte = (byte)(currentByte | (set ? 2 : 0));
value = index + 7 < width ? imageData[(offset + 7)] & 0xFFFFFF : 16777215;
set = (value >> 0 & 0xFF) + (value >> 8 & 0xFF) + (value >> 16 & 0xFF) < 384;
currentByte = (byte)(currentByte | (set ? 1 : 0));
dataline[(index >> 3)] = currentByte;
blankLine &= currentByte == 0;
}
if (!blankLine)
{
if (blanklineCount > 0)
{
addToDoc(m_Document, "A");
addToDoc(m_Document, blanklineCount);
blanklineCount = 0;
}
addToDoc(m_Document, compressGraphicLine(dataline));
}
else
{
blanklineCount = (byte)(blanklineCount + 1);
if (blanklineCount == 255)
{
addToDoc(m_Document, "A");
addToDoc(m_Document, blanklineCount);
blanklineCount = 0;
}
}
}
if (blanklineCount > 0)
{
addToDoc(m_Document, "A");
addToDoc(m_Document, blanklineCount);
blanklineCount = 0;
}
addToDoc(m_Document, ESC + "E");
}
private byte[] compressGraphicLine(byte[] dataline)
{
byte count = 0;
byte currentByte = 0;
ByteArrayOutputStream rleString = new ByteArrayOutputStream(128);
addToDoc(rleString, "G");
for (int index = 0; index < dataline.length; index++) {
if (count == 0)
{
currentByte = dataline[index];
addToDoc(rleString, currentByte);
count = (byte)(count + 1);
}
else if ((count < 255) && (currentByte == dataline[index]))
{
count = (byte)(count + 1);
}
else
{
addToDoc(rleString, count);
count = 0;
currentByte = dataline[index];
addToDoc(rleString, currentByte);
count = (byte)(count + 1);
}
}
if (count > 0) {
addToDoc(rleString, count);
}
if (rleString.size() > dataline.length + 1)
{
rleString.reset();
addToDoc(rleString, "U");
for (int item = 0; item < dataline.length; item++) {
addToDoc(rleString, dataline[item]);
}
}
return rleString.toByteArray();
}
但我不明白为什么它不起作用。
最后我尝试使用如何在 Android 的蓝牙打印机上打印图像?使用与指南相同的算法,但仍然打印随机的奇怪符号。