Hello,
I am working on issue "8315113 Print request Chromaticity.MONOCHROME
attribute does not work on macOS" [1].
There is PMSetColorMode function in the Apple Developer documentation
[2] but it is marked as deprecated
"There is no replacement; this function was included to facilitate
porting legacy applications to macOS, but it serves no useful purpose."
and really does nothing.
Using native print dialog and selecting Black & White box allows to
print black and white pages on macOS.
I dumped NSPrintInfo print settings dictionary for two printers when the
Black & White box is selected and the logs contain
ColorModel key, Gray value for HP ColorLaserJet MFP M178-M181-AirPrint
printer and
HPColorMode key, grayscale value for HP Ink Tank 115.
It looks like each printer can have each own key/value for Black & White
settings.
I tried to print key/values for all presets available for NSPrintInfo
without using the native print dialog:
----------
PMPrinter pr;
PMPrintSession printSession = (PMPrintSession)[printInfo
PMPrintSession];
OSStatus status = PMSessionGetCurrentPrinter(printSession, &pr);
CFArrayRef presetsList = nil;
status = PMPrinterCopyPresets(pr, &presetsList);
CFIndex arrayCount = CFArrayGetCount(presetsList);
for (CFIndex index = 0; index < arrayCount; index++) {
PMPreset preset = (PMPreset)CFArrayGetValueAtIndex(presetsList,
index);
CFStringRef presetName = nil;
if (PMPresetCopyName(preset, &presetName) == noErr &&
CFStringGetLength(presetName) > 0) {
NSLog(@" presetName: '%@'", presetName);
NSDictionary* dict = nil;
if (PMPresetGetAttributes(preset,
(CFDictionaryRef*)(&dict)) == noErr) {
// print preset dict
----------
The printers which I tested do contain "Black and White" preset but they
do not include key/values related to black and white printing.
What is the right way to use different key/values (ColorModel: Gray,
HPColorMode: grayscale, ...) in code to set Black & White settings for
NSPrintInfo?
Could it be a configuration file which contains all color model
key/values for all known printers?
Thanks,
Alexander.
[1] https://bugs.openjdk.org/browse/JDK-8315113
[2]
https://developer.apple.com/documentation/applicationservices/core_printing/1805783-pmsetcolormode
