daij-djan / qr-image-encoder Goto Github PK

This 'library' offers a C function that encodes data in a QR Code. The output is a binary stream representing the QR Code.

It also includes a QREncoder Objective-C class that can be used in osx/ios to generate a NSImage/UIImage

###How to use it in C The main function is EncodeData and can be used as follows:

int QR_width=EncodeData(level,version,inputdata,inputdata_length,outputdata_area);

If you set inputdata_length to 0 the function will determine the length from NULL termination of inputdata.

QR_width then contains the width of the code. So the function with writes QR_width*QR_width bits to the given outputdata.

1s represent black, 0s white. To use this data you'd iterate over it something like this:

for(int y=0;y<QR_width;y++) {
    for(int x=0;x<QR_width;x++) {
        int value = get_next_bit();
        draw_pixel(x,y,value);
    }
}

###How to work with the objective-C class

The objC bindings define the class QREncoder which is cross-platform and also works with objc and swift.

It defines methods for encoding NSStrings or NSData objects into a QR Code returned to you as image.

[obj] NSImage *qrCode = [QREncoder imageForString:@"DEMODEMODEMO"];
[swift] let qrCode = QREncoder.imageForString("DEMODEMODEMO")

######license The code of the library and the three demos is provided under the terms of the BSD license.