iOS development QR code generation

Generation of two-dimensional code based on Libqrencode

+ (void) Drawqrcode: (QRCode *) code context: (CGCONTEXTREF) CTX Size: (cgfloat) Size {

unsigned char *data = 0;

int width;

data = code->data;

width = code->width;

FLOAT zoom = (double) size/(code->width + 2.0 * qr_margin);

CGRect Rectdraw = CGRectMake (0, 0, zoom, zoom);

Draw

Cgcontextsetfillcolor (CTX, cgcolorgetcomponents ([Uicolor Blackcolor]. Cgcolor));

for (int i = 0; i < width; ++i) {

for (int j = 0; J < width; ++j) {

if (*data & 1) {

Rectdraw.origin = Cgpointmake ((j + qr_margin) * Zoom, (i + qr_margin) * zoom);

Cgcontextaddrect (CTX, Rectdraw);

}

++data;

}

}

Cgcontextfillpath (CTX);

}

+ (UIImage *) qrimageforstring: (NSString *) string imageSize: (cgfloat) Size {

if (![ String length]) {

return nil;

}

QRCode *code = qrcode_encodestring ([string utf8string], 0, qr_eclevel_l, qr_mode_8, 1);

if (!code) {

return nil;

}

Create context

Cgcolorspaceref colorspace = Cgcolorspacecreatedevicergb ();

Cgcontextref CTX = cgbitmapcontextcreate (0, size, size, 8, size * 4, colorspace, kcgimagealphapremultipliedlast);

Cgaffinetransform TranslateTransform = cgaffinetransformmaketranslation (0,-size);

Cgaffinetransform ScaleTransform = Cgaffinetransformmakescale (1,-1);

CGCONTEXTCONCATCTM (CTX, Cgaffinetransformconcat (TranslateTransform, ScaleTransform));

Draw QR on this context

[Qrcodegenerator Drawqrcode:code context:ctx size:size];

Get image

Cgimageref qrcgimage = Cgbitmapcontextcreateimage (CTX);

UIImage * Qrimage = [UIImage imagewithcgimage:qrcgimage];

Some releases

Cgcontextrelease (CTX);

Cgimagerelease (Qrcgimage);

Cgcolorspacerelease (ColorSpace);

Qrcode_free (code);

return qrimage;

}

iOS development QR code generation