如何在PDF中输出欧元符号 [英] How to output a Euro symbol in a PDF

问题描述

我想使用Core Graphics输出欧元符号到PDF。我有以下代码，它使用NSMacOSRomanStringEncoding（我不得不使用这个来获得£和$符号出现正确），但欧元符号出来作为

  CGRect pageRect = CGRectMake（0，0，800，1150）; 
 CFMutableDataRef pdfData =（CFMutableDataRef）[NSMutableData dataWithCapacity：0]; 
 CGDataConsumerRef dataConsumer = CGDataConsumerCreateWithCFData（pdfData）; 
 CGContextRef pdfContext = CGPDFContextCreate（dataConsumer，& pageRect，nil）; 
 
 CGContextSelectFont（pdfContext，Helvetica，15，kCGEncodingMacRoman）; 
 CGContext SetTextDrawingMode（pdfContext，kCGTextFill）; 
 CGContextSetRGBFillColor（pdfContext，0，0，0，1）; 
 const char * ctext = [@€cscringUsingEncoding：NSMacOSRomanStringEncoding]; 
 CGContextShowTextAtPoint（pdfContext，10，10，ctext，strlen（ctext））; 
  

解决方案

您应该能够使用 CGContextShowGlyphsAtPoint 来绘制欧元符号。 catch是你需要传递该函数 CGGlyph 作为输入，而不是一个Unicode字符。此外，从Unicode字符到 CGGlyphs 的映射是与字体相关的，并且通常是非平凡的。 （有时它是一个简单的偏移，你可以猜测基于试验和错误。）

看起来像Core Text有一个函数 CTFontGetGlyphsForCharacters 其可以执行变换;我从未在实践中使用它：

http://developer.apple.com/library/mac/#documentation/Carbon/Reference/CTFontRef/Reference/reference.html

此外：如果使用 CGContextShowGlyphsAtPoint ，您需要将调用替换为 CGContextSelectFont 与 CGContextSetFont 和 CGContextSetFontSize 。

I am trying to output a Euro symbol to a PDF using Core Graphics. I have the following code, which uses NSMacOSRomanStringEncoding (I had to use this to get £ and $ symbols to appear correctly), but the Euro symbol comes out as ¤

CGRect pageRect = CGRectMake(0, 0, 800, 1150);
CFMutableDataRef pdfData = (CFMutableDataRef) [NSMutableData dataWithCapacity:0];                     
CGDataConsumerRef dataConsumer = CGDataConsumerCreateWithCFData(pdfData);
CGContextRef pdfContext = CGPDFContextCreate(dataConsumer, &pageRect, nil);

CGContextSelectFont(pdfContext, "Helvetica", 15, kCGEncodingMacRoman);
CGContextSetTextDrawingMode (pdfContext, kCGTextFill);
CGContextSetRGBFillColor (pdfContext, 0, 0, 0, 1);
const char *ctext = [@"€" cStringUsingEncoding:NSMacOSRomanStringEncoding];
CGContextShowTextAtPoint(pdfContext, 10, 10, ctext, strlen(ctext));

解决方案

You should be able to use CGContextShowGlyphsAtPoint to draw the Euro symbol. The catch is that you need to pass that function a CGGlyph as input, rather than a Unicode character. Furthermore, the mapping from Unicode characters to CGGlyphs is font-dependent and often nontrivial. (Sometimes it's a simple offset that you can guess based on trial and error.)

It looks like Core Text has a function CTFontGetGlyphsForCharacters which might perform the transformation; I've never used it in practice, though:

http://developer.apple.com/library/mac/#documentation/Carbon/Reference/CTFontRef/Reference/reference.html

Also: if you use CGContextShowGlyphsAtPoint you will need to replace the call to CGContextSelectFont with CGContextSetFont and CGContextSetFontSize instead.

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