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I'm creating a Qt application that writes a pdf file using libharu. The true-type-font that is used in the pdf file shall be embedded into the binary file, so it is available on all platforms. For this, I want to use the Qt resource system.

The font file should be used as follows

const char* fontName = HPDF_LoadTTFontFromFile(doc,"path/to/myfont.ttf",HPDF_TRUE);
documentFont = HPDF_GetFont(doc,fontName,"ISO8859-2");

where I want the filename and path to be replaced by a resource name (e.g. :/fonts/myfont.ttf). Is there a way to achieve this?

The options that I think of:

  • Somehow pass the file content as a string or char array (as it is suggested here). This is not possible as the functions in libharu require a filename. There are no functions that require the actual file content.
  • Save the resource content to a temporary file and use the temporary file name in the libharu function.

Are there any other more simple solutions for this? Thanks.

Solution:

Actually the second option was easier than expected. With the answer by robin.thoni and this question, I obtained this pretty simple solution:

std::string fontFile = std::tmpnam(nullptr);
QFile::copy(":/fonts/myfont.ttf",QString::fromStdString(fontFile));
const char* fontName = HPDF_LoadTTFontFromFile(doc,fontFile.c_str(),HPDF_TRUE);
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Gregor
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  • What's wrong with the second option? – frogatto Sep 06 '16 at 17:39
  • It should work but I don't like the idea to write a file from the code to the filesystem and read the same file again from the same code. I would think that there is a more simple way and I wonder if no one else ever needs to pass a file from a Qt resource to a non-Qt function. – Gregor Sep 06 '16 at 18:08

1 Answers1

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As you can see here How to access resource image with fopen?, there's no way to 'open' a Qt resource file using standard open/fopen, so you won't be able to craft a valid path to it. You will need to use your second option. You could use std::tmpnam to achieve it.

Robin Thoni
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