2

我有兴趣使用蓝牙打印机设备以编程方式从 iPhone 打印图像。

在其中一个示例代码中，我实现了文本打印代码，但在该示例中，我没有了解如何将图像转换为格式，例如

        unsigned char buffer3[796]={
        0x55 ,  0x66 ,  0x77 ,  0x88 ,  0x44 ,  0x1B ,  0x58 ,  0x31 ,  
        0x19, 0x20, 
        0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x80 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x01 ,0xC0 ,0x00
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x01 ,0x80 ,0x00 ,0x03 ,0x60 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x03
        ,0xA0 ,0x00 ,0x07 ,0xB0 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x05 ,0x60 ,0x00 ,0x07 ,0xD8 ,0x00
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x05 ,0xA0 ,0x00 ,0x13 ,0xEC ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x04 
        ,0x20 ,0x00 ,0x29 ,0xF4 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x03 ,0xC0 ,0x00 ,0x64 ,0xF9 ,0x00
        ,0x0F ,0xFF ,0x9C ,0x01 ,0xC0 ,0x19 ,0xFF ,0xC0 ,0x7F ,0xFC ,0x7F ,0xF9 ,0xC0 ,0x3D ,0xFF
        ,0xF1 ,0xFF ,0xE3 ,0xFF ,0xC0 ,0x00 ,0x00 ,0xF2 ,0x73 ,0x80 ,0x0F ,0xFF ,0x9C ,0x01 ,0xC0
        ,0x19 ,0xFF ,0xC0 ,0x7F ,0xFE ,0x7F ,0xFD ,0xE0 ,0x3D ,0xFF ,0xF1 ,0xFF ,0xE3 ,0xFF ,0xC0
        ,0x00 ,0x00 ,0x79 ,0x26 ,0xC0 ,0x0F ,0xFF ,0xDC ,0x01 ,0xC0 ,0x19 ,0xFF ,0xC0 ,0x7F ,0xFE
        ,0xFF ,0xFD ,0xF0 ,0x7D ,0xFF ,0xFB ,0xFF ,0xF7 ,0xFF ,0xE0 ,0x00 ,0x03 ,0x3C ,0x8F ,0x60
        ,0x0C ,0x01 ,0xDC ,0x01 ,0xC0 ,0x19 ,0x80 ,0x00 ,0x70 ,0x0E ,0xE0 ,0x1D ,0xF0 ,0x7D ,0x80
        ,0x3B ,0x80 ,0x77 ,0x00 ,0xE0 ,0x00 ,0x04 ,0x9E ,0x8F ,0xB0 ,0x0E ,0x01 ,0xDC ,0x01 ,0xC0
        ,0x19 ,0x80 ,0x00 ,0x70 ,0x0E ,0xE0 ,0x1D ,0xF8 ,0xFD ,0x80 ,0x33 ,0x80 ,0x77 ,0x00 ,0xE0
        ,0x00 ,0x0E ,0x4F ,0x27 ,0xD8 ,0x0F ,0xFF ,0x9C ,0x01 ,0xC0 ,0x19 ,0xFF ,0xC0 ,0x7F ,0xFC 
        ,0xE0 ,0x1D ,0xF9 ,0xFD ,0xFF ,0xF3 ,0x80 ,0x77 ,0x00 ,0xE0 ,0x00 ,0x0F ,0x26 ,0x53 ,0xC8
        ,0x0F ,0xFF ,0x9C ,0x01 ,0xC0 ,0x19 ,0xFF ,0xC0 ,0x7F ,0xFC ,0xEF ,0xFD ,0xDD ,0xDD ,0xFF
        ,0xF3 ,0x80 ,0x77 ,0x00 ,0xE0 ,0x00 ,0x07 ,0x90 ,0xC9 ,0xF0 ,0x0F ,0xFF ,0xDC ,0x01 ,0xC0
        ,0x19 ,0xFF ,0xC0 ,0x7F ,0xFE ,0xEF ,0xFD ,0xDF ,0x9D ,0xFF ,0xFB ,0x80 ,0x77 ,0x00 ,0xE0
        ,0x00 ,0x03 ,0xC9 ,0xE4 ,0xE0 ,0x0C ,0x00 ,0xDC ,0x01 ,0xC0 ,0x19 ,0x80 ,0x00 ,0x70 ,0x06 
        ,0xE7 ,0xFD ,0xCF ,0x9D ,0x80 ,0x3B ,0x80 ,0x77 ,0x00 ,0xE0 ,0x00 ,0x01 ,0xF0 ,0xF2 ,0x40
        ,0x0E ,0x01 ,0xDC ,0x00 ,0xC0 ,0x19 ,0x80 ,0x00 ,0x70 ,0x0E ,0xE0 ,0x1D ,0xCF ,0x1D ,0x80
        ,0x3B ,0x80 ,0x77 ,0x00 ,0xE0 ,0x00 ,0x00 ,0xE6 ,0x79 ,0x00 ,0x0F ,0xFF ,0xDF ,0xFC ,0xFF
        ,0xF9 ,0xFF ,0xC0 ,0x7F ,0xFE ,0xE0 ,0x1D ,0xC7 ,0x1D ,0xFF ,0xFB ,0xFF ,0xF7 ,0xFF ,0xE0
        ,0x00 ,0x00 ,0x49 ,0x3D ,0x00 ,0x0F ,0xFF ,0x9F ,0xFC ,0xFF ,0xF9 ,0xFF ,0xC0 ,0x7F ,0xFE
        ,0xE0 ,0x1D ,0xC2 ,0x1D ,0xFF ,0xF1 ,0xFF ,0xE3 ,0xFF ,0xC0 ,0x00 ,0x00 ,0x1C ,0x9E ,0x00 
        ,0x0F ,0xFF ,0x1F ,0xFC ,0x7F ,0xE1 ,0xFF ,0xC0 ,0x7F ,0xFC ,0xE0 ,0x1D ,0xC0 ,0x1D ,0xFF
        ,0xE0 ,0xFF ,0xC1 ,0xFF ,0x80 ,0x00 ,0x00 ,0x1E ,0x4C ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00
        ,0x00 ,0x00 ,0x0F ,0x20 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x07 ,0x90 ,0x00
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x03 ,0xE0 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x01 ,0xC0 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x80 ,0x00
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 ,0x00 
        ,0x00 ,0x00 ,0x00   
    };


    //[self addLabel:@"buffer3 is selected"];
    [[session outputStream] write:(const uint8_t *)buffer3 maxLength:796];//send print package*/

这是图像打印的示例代码我无法打印任何其他图像，因为我不知道如何将 UIImage 或 NSData 转换为下面提到的位代码。如果有任何正确的分步方法来进行图像到位图的转换，请告诉我。

提前致谢。

4

1 回答 1

2

你可以看看这个问题，这个问题和我的问题基本相同，你问的是：如何将十六进制数组转换为 UIImage？

查看 p25 打印机的开发人员指南（pdf 附在答案中的上述链接中）[特别是通过 p.20 - 24；p。一些示例见第 48 - 53 页，示例代码中的 iPhone 特定打印命令见第 56 页] 第 22 页显示了图像是如何由像素组成的。我正在考虑将 .png 图像转换为 .bmp 或一些简单的黑白图像格式，我还不知道。如果你有任何成功，你可以分享。其他六个问题中给出的解决方案与您的完全一样，还没有帮助我完全解决问题（尽管我还没有放弃）

祝你好运！

更新

到目前为止，我已经设法通过将像素值设置为黑色或白色来将 .png 图像转换为黑白图像，具体取决于 RGB 值的平均值。我的代码是来自不同帖子的代码的组合，我没有在这里发布它们的链接。

每个像素由 4 个字节表示。一旦我将像素的颜色值更改为黑色或白色，我只需要查看每 4 个像素的第一个字节即可进行其余的计算。如果它的值为 0（r、g、b 都 == 0，因此像素的颜色为黑色）我将 2^7 存储在int var pixelCount中，它以二进制表示10000000，因此根据打印机为 1 个像素. 然后我继续到下一个像素，如果该组 4 个字节的第一个字符的值为 0（像素为黑色），则将 2^6（二进制的 01000000）添加到pixelCount 。添加 8 个像素的 2^ 值并存储为无符号字符它代表 8 个像素（1 个字节）。我已将这些 char 值的缓冲区数组发送到打印机，但它会打印 ASCII 字符，这可能意味着我的打印图像命令输入错误。

任何关于我的代码的评论将不胜感激。希望这可以帮助。

UIImage *image = [UIImage imageNamed:@"label.png"];
CGImageRef imageRef = [image CGImage];
NSUInteger width = CGImageGetWidth(imageRef);
NSUInteger height = CGImageGetHeight(imageRef);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

unsigned char *rawData = (unsigned char*) calloc(height*width*4, sizeof(unsigned char));
NSUInteger bytesPerPixel = 4;
NSUInteger bytesPerRow = bytesPerPixel* width;
NSUInteger bitsPerComponent = 8;
//this methid returns the pixel data in rawData
CGContextRef context = CGBitmapContextCreate(rawData,
                                             width,
                                             height,
                                             bitsPerComponent,
                                             bytesPerRow,
                                             colorSpace,
                                             kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Big);

CGContextDrawImage(context, CGRectMake(0,0, width,height), imageRef);
CGContextRelease(context);

size_t length = image.size.height*image.size.width*4;
CGFloat intensity;

//black or white
int bw;

//initialize print buffer
size_t bufferLength = (image.size.height*image.size.width) / 8+10;
unsigned char buffer[bufferLength];

buffer[0] = 0x55; buffer[1] = 0x66; buffer[2] = 0x77; buffer[3] = 0x88; //esc sequence
buffer[4] = 0x44; //print command
buffer[5] = 0x1B; buffer[6] = 0x58; buffer[7] = 0x31;buffer[8] = (char) 200/8 ; buffer[9] = 30 ;  //and iOS specific print image command

int pixelCount = 0;
int byteCount = 10;


//check pixel values and average to black or white (4 bytes per pixel)
for(int index = 0; index<length;index+=4){
    intensity = (float)(rawData[index]+rawData [index+1] + rawData[index+2])/3.;

    if(intensity >= 128 ){
        bw = 255;
        //if pixel white, bit is 0

    }
    else {
        bw = 0;
                    //if black pixel, set one bit of byte on
        buffer[byteCount] += (char) pow(2, 7 - pixelCount);

    }

    //next pixel
    pixelCount++;

    //every 8 pixels, move to next char of print buffer
    if(pixelCount % 8 == 0)
        byteCount++;



    //      NSLog(@"Pixel %i : r: %i g: %i b: %i a: %i", counter++, rawData[index], rawData[index+1], rawData[index+2], rawData[index+3]);

    //save pixel values as black or white for new image
    rawData[index]   = bw;
    rawData[index+1] = bw;
    rawData[index+2] = bw;
    rawData[index+3] = 255;
}


CGContextRef bitmapContext=CGBitmapContextCreate(rawData, image.size.width, image.size.height, 8, 4*image.size.width, colorSpace,  kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);

CFRelease(colorSpace);

free(rawData);
CGImageRef cgImage=CGBitmapContextCreateImage(bitmapContext);
CGContextRelease(bitmapContext);

UIImage *bwImage = [UIImage imageWithCGImage:cgImage];
[imageView setImage:bwImage];


//          NSLog(@"2011printing imagelog");
//      //[self addLabel:@"buffer3 is selected"];
//      [[session outputStream] writ
于 2013-01-11T12:55:05.157 回答