How do I find the position of a single character on a page?

Hi guys,
I am developing a PDFEditor, but am having trouble implementing the code which finds the location of glyph characters on a page (in device space). I have read the pdf reference on Text, but do not quite understand it.
I have worked out the individual character spacings, but I cannot accurately find the location of the first character .
Here is my current attempt:
float y = CGPDFPageGetBoxRect([current_page pageReference], kCGPDFCropBox).size.height-current_matrix_position.y;
float x = current_matrix_position.x;
float xa = a * x + c * y + e;
float ya = b * x + d * y + f;
text_position = [NSValue valueWithCGRect: CGRectMake(xa, ya, 15, d)];
(where text_position is the location of the start character in device space. a,b,c etc come from the Tm operator.
current_matrix_position is set as a point (e,f) from the cm operator.)
This code seems to work with some PDF files:
But does not work with others:
(Note there is text in the box above the blue which cannot be disclosed for reasons...)
Is there something I am missing (like another operator?) or is my formula completely wrong.
Your help would be greatly appreciated

Hi Irosenth,
I have been reading the spec and trying to understand it for several weeks. Unfortunately, I am still confused with how to find the coordinates of the text.
>> You need to parse the content stream(s) that are associated with the page and
I have done this. My program finds both the cm operator, the tm operator and the font widths etc. Unfortunately, now that I have all of this information, I am unsure what to do with it.
How do I properly add these two matricies together? I have looked in the spec which describes it as:
x' = a * x + c * y + e
y' = b * x + d * y + f
I tried this and the results worked on some pages, but not on others (several thousand x coordinates out...). I am finding the ISO 32000-1:2008 very confusing in this section.
>> manage what you find there
This is the part I am having major trouble with. Using the coordinate transformation matricies, how can I determine the starting coordinate for the first glyph in a text (BT, ET) on a non-scaled page (so 1 unit = 1 pixel) using the matricies?
Thanks

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