无NSView打印 [英] Printing without an NSView

问题描述

目前我正在为OSX写一个应用程序，最终需要移植到iOS。

Currently I'm writing an app for OSX which will eventually need to be ported to iOS.

需要打印的数据通过CoreGraphics绘制到一个PDF上下文中 - 工作完美。

The data that needs to be printed is being drawn via CoreGraphics into a PDF context - that is working perfectly.

我一直在阅读关于在iOS和OSX打印的Apple开发文档，讽刺的是，它实际上似乎从iOS打印将更容易。

I've been reading the Apple dev documentation on printing in both iOS and OSX, and, ironically, it actually seems printing from iOS will be easier.

在iOS ， UIPrintInteractionController 的 printItem 属性可以获取包含PDF数据的NSData对象并打印。看起来应该相当简单。

On iOS, UIPrintInteractionController's printingItem property can take an NSData object containing PDF data and print that. Looks like it should be fairly straight-forward.

另一方面，OSX（看起来像）需要使用 NSPrintOperation 类 - 但它似乎是获取数据的唯一方法一个实例是通过一个NSView。 （ + printOperationWithView：或 + printOperationWithView：printInfo：）。

OSX on the other hand, (looks like it) requires using the NSPrintOperation class - but it seems the only way to get data into an instance is via an NSView. (+printOperationWithView: or +printOperationWithView:printInfo:).

看到内容的格式化和分页已经，似乎没有意义，必须重新绘制PDF数据到像NSView的东西。

Seeing as the content is formatted and paginated already it seems rather pointless to have to re-draw the PDF data to something like an NSView.

可能有

推荐答案

这段代码并不完整，但对任何人来说，这之后，这基本上是如何直接打印从NSData流：

This code is by no means complete, but for anyone who comes across this later, this is basically how you can print directly from an NSData stream:

#define kMimeType @"application/pdf"
#define kPaperType @"A4"
- (void)printData:(NSData *)incomingPrintData {
    CFArrayRef printerList; //will soon be an array of PMPrinter objects
    PMServerCreatePrinterList(kPMServerLocal, &printerList);
    PMPrinter myPrinter;
    //iterate over printerList and determine which one you want, assign to myPrinter

    PMPrintSession printSession;
    PMPrintSettings printSettings;
    PMCreateSession(&printSession);
    PMCreatePrintSettings(&printSettings);
    PMSessionDefaultPrintSettings(printSession, printSettings);

    CFArrayRef paperList;
    PMPrinterGetPaperList(myPrinter, &paperList);
    PMPaper usingPaper;
    //iterate over paperList and to set usingPaper to the paper desired

    PMPageFormat pageFormat;
    PMCreatePageFormatWithPMPaper(&pageFormat, usingPaper);

    CGDataProviderRef dataProvider = CGDataProviderCreateWithCFData((CFDataRef)incomingPrintData);
    PMPrinterPrintWithProvider(myPrinter, printSettings, pageFormat, (CFStringRef)kMimeType, dataProvider);
}

（通过核心打印参考）

谨防此代码缺少内存管理，因此您将需要使用 PMRetain（）和 PMRelease（）函数以及CoreFoundation内存管理函数。

(via Core Printing Reference)
Beware this code lacks memory management so you will need to use the PMRetain() and PMRelease() functions as well as the CoreFoundation memory-management functions as well.

如果任何人都能告诉我如何从OSX打印对话框获取数据，我可以在这个方法中使用我接受他们的答案，而不是这个。也就是说，不使用碳函数。

If anyone can tell me how I can get data from the OSX print dialogue into data I can use in this method I'll accept their answer instead of this. That is, without using Carbon functions.

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