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Create Unicode text or embed composite fonts in PDF files using Obj-C

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Sample Obj-C code for using PDFTron SDK to create Unicode text and embed composite fonts in PDF files. Learn more about our Obj-C PDF Library.

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// Copyright (c) 2001-2023 by Apryse Software Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.

#import <OBJC/PDFNetOBJC.h>
#import <Foundation/Foundation.h>

 * This example illustrates how to create Unicode text and how to embed composite fonts.
 * Note: This demo assumes that 'arialuni.ttf' is present in '/Samples/TestFiles' 
 * directory. Arial Unicode MS is about 24MB in size and it comes together with Windows and 
 * MS Office.
 * For more information about Arial Unicode MS, please consult the following Microsoft Knowledge 
 * Base Article: WD2002: General Information About the Arial Unicode MS Font
 * For more information consult: 
 * In case you don't have access to Arial Unicode MS you can use cyberbit.ttf 
 * ( instead.

int main(int argc, char *argv[])
    @autoreleasepool {
        int ret = 0;
        [PTPDFNet Initialize: 0];

        // Relative path to the folder containing test files.
        NSString *input_path =  @"../../TestFiles/";
        NSString *output_path = @"../../TestFiles/Output/";

        PTPDFDoc *doc = [[PTPDFDoc alloc] init];

        PTElementBuilder *eb = [[PTElementBuilder alloc] init];       
        PTElementWriter *writer = [[PTElementWriter alloc] init]; 

        // Start a new page ------------------------------------
        PTPDFRect * rect = [[PTPDFRect alloc] init];
        [rect Set: 0 y1: 0 x2: 612 y2: 794];
        PTPage *page = [doc PageCreate: rect];
        [writer WriterBeginWithPage: page placement: e_ptoverlay page_coord_sys: YES compress: YES resources: NULL];    // begin writing to this page

        PTFont *fnt = [[PTFont alloc] init];
            // Embed and subset the font
            fnt = [PTFont CreateCIDTrueTypeFont: [doc GetSDFDoc] font_path: @"../../TestFiles/ARIALUNI.ttf" embed: true subset: true encoding:e_ptIdentityH ttc_font_index:0];
        @catch(NSException *e)
        if(fnt != nil) {
            NSLog(@"Note: using %@ for unshaped unicode text", @"../../TestFiles/ARIALUNI.ttf");
        else {
            NSLog(@"Note: using system font substitution for unshaped unicode text");
            fnt = [PTFont CreateFromName: [doc GetSDFDoc] name: @"Helvetica" char_set:@""];
        PTElement *element = [eb CreateTextBeginWithFont: fnt font_sz: 1];
        PTMatrix2D *m = [[PTMatrix2D alloc] initWithA: 10 b: 0 c: 0 d: 10 h: 50 v: 600];
        [element SetTextMatrixWithMatrix2D: m];
        [[element GetGState] SetLeading: 2]; // Set the spacing between lines
        [writer WriteElement: element];

        // Hello World!
        unsigned short hello[] = {'H','e','l','l','o',' ','W','o','r','l','d','!'};
        [writer WriteElement: [eb CreateUnicodeTextRun: (unsigned short*)&hello text_data_sz: sizeof(hello)/sizeof(unsigned short)]];
        [writer WriteElement: [eb CreateTextNewLine]];

        // Latin
        unsigned short latin[] = {'a', 'A', 'b', 'B', 'c', 'C', 'd', 'D', 0x45, 0x0046, 0x00C0, 
            0x00C1, 0x00C2, 0x0143, 0x0144, 0x0145, 0x0152, '1', '2' // etc.
        [writer WriteElement: [eb CreateUnicodeTextRun: (unsigned short*)&latin text_data_sz: sizeof(latin)/sizeof(unsigned short)]];
        [writer WriteElement: [eb CreateTextNewLine]];

        // Greek
        unsigned short greek[] = {  
            0x039E, 0x039F, 0x03A0, 0x03A1,0x03A3, 0x03A6, 0x03A8, 0x03A9  // etc.
        [writer WriteElement: [eb CreateUnicodeTextRun: (unsigned short*)&greek text_data_sz: sizeof(greek)/sizeof(unsigned short)]];
        [writer WriteElement: [eb CreateTextNewLine]];

        // Cyrillic
        unsigned short cyrillic[] = {   
            0x0409, 0x040A, 0x040B, 0x040C, 0x040E, 0x040F, 0x0410, 0x0411,
            0x0412, 0x0413, 0x0414, 0x0415, 0x0416, 0x0417, 0x0418, 0x0419 // etc.
        [writer WriteElement: [eb CreateUnicodeTextRun: (unsigned short*)&cyrillic text_data_sz: sizeof(cyrillic)/sizeof(unsigned short)]];
        [writer WriteElement: [eb CreateTextNewLine]];
        // Hebrew
        unsigned short hebrew[] = {
            0x05D0, 0x05D1, 0x05D3, 0x05D3, 0x05D4, 0x05D5, 0x05D6, 0x05D7, 0x05D8, 
            0x05D9, 0x05DA, 0x05DB, 0x05DC, 0x05DD, 0x05DE, 0x05DF, 0x05E0, 0x05E1 // etc. 
        [writer WriteElement: [eb CreateUnicodeTextRun: (unsigned short*)&hebrew text_data_sz: sizeof(hebrew)/sizeof(unsigned short)]];
        [writer WriteElement: [eb CreateTextNewLine]];

        // Arabic
        unsigned short arabic[] = {
            0x0624, 0x0625, 0x0626, 0x0627, 0x0628, 0x0629, 0x062A, 0x062B, 0x062C, 
            0x062D, 0x062E, 0x062F, 0x0630, 0x0631, 0x0632, 0x0633, 0x0634, 0x0635 // etc. 
        [writer WriteElement: [eb CreateUnicodeTextRun: (unsigned short*)&arabic text_data_sz: sizeof(arabic)/sizeof(unsigned short)]];
        [writer WriteElement: [eb CreateTextNewLine]];

        // Thai 
        unsigned short thai[] = {
            0x0E01, 0x0E02, 0x0E03, 0x0E04, 0x0E05, 0x0E06, 0x0E07, 0x0E08, 0x0E09, 
            0x0E0A, 0x0E0B, 0x0E0C, 0x0E0D, 0x0E0E, 0x0E0F, 0x0E10, 0x0E11, 0x0E12 // etc. 
        [writer WriteElement: [eb CreateUnicodeTextRun: (unsigned short*)&thai text_data_sz: sizeof(thai)/sizeof(unsigned short)]];
        [writer WriteElement: [eb CreateTextNewLine]];

        // Hiragana - Japanese 
        unsigned short hiragana[] = {
            0x3041, 0x3042, 0x3043, 0x3044, 0x3045, 0x3046, 0x3047, 0x3048, 0x3049, 
            0x304A, 0x304B, 0x304C, 0x304D, 0x304E, 0x304F, 0x3051, 0x3051, 0x3052 // etc. 
        [writer WriteElement: [eb CreateUnicodeTextRun: (unsigned short*)&hiragana text_data_sz: sizeof(hiragana)/sizeof(unsigned short)]];
        [writer WriteElement: [eb CreateTextNewLine]];
        // CJK Unified Ideographs
        unsigned short cjk_uni[] = {
            0x5841, 0x5842, 0x5843, 0x5844, 0x5845, 0x5846, 0x5847, 0x5848, 0x5849, 
            0x584A, 0x584B, 0x584C, 0x584D, 0x584E, 0x584F, 0x5850, 0x5851, 0x5852 // etc. 
        [writer WriteElement: [eb CreateUnicodeTextRun: (unsigned short*)&cjk_uni text_data_sz: sizeof(cjk_uni)/sizeof(unsigned short)]];
        [writer WriteElement: [eb CreateTextNewLine]];

        // Simplified Chinese
        unsigned short chinese_simplified[] = {
            0x4e16, 0x754c, 0x60a8, 0x597d
        [writer WriteElement: [eb CreateUnicodeTextRun: (unsigned short*)&chinese_simplified text_data_sz: sizeof(chinese_simplified)/sizeof(unsigned short)]];
        [writer WriteElement: [eb CreateTextNewLine]];

        // Finish the block of text
        [writer WriteElement: [eb CreateTextEnd]];
        NSLog(@"Now using text shaping logic to place text");

        // Create a font in indexed encoding mode 
        // normally this would mean that we are required to provide glyph indices
        // directly to CreateUnicodeTextRun, but instead, we will use the GetShapedText
        // method to take care of this detail for us.
        PTFont* indexedFont =  [PTFont CreateCIDTrueTypeFont: [doc GetSDFDoc] font_path: @"../../TestFiles/NotoSans_with_hindi.ttf" embed: true subset: true encoding:e_ptIdentityH ttc_font_index:0];
        element = [eb CreateTextBeginWithFont: indexedFont font_sz: 10.0];
        [writer WriteElement: element];

        double linePos = 350.0;
        double lineSpace = 20.0;

        // Transform unicode text into an abstract collection of glyph indices and positioning info 
        PTShapedText* shapedText = [indexedFont GetShapedText: @"Shaped Hindi Text:"];

        // transform the shaped text info into a PDF element and write it to the page
        element = [eb CreateShapedTextRun : shapedText];
        PTMatrix2D *m1 = [[PTMatrix2D alloc] initWithA: 1.5 b: 0 c: 0 d: 1.5 h: 50 v: linePos];
        [element SetTextMatrixWithMatrix2D: m1];
        linePos -= lineSpace;
        [writer WriteElement: element];

        // read in unicode text lines from a file 

        NSString *filepath = [[NSBundle mainBundle] pathForResource:@"../../TestFiles/hindi_sample_utf16le" ofType:@"txt"];
        NSError *error;
        NSString *fileContents = [NSString stringWithContentsOfFile:filepath encoding:NSUTF16StringEncoding error:&error];

        if (error)
            NSLog(@"Error reading file: %@", error.localizedDescription);

        NSArray *listArray = [fileContents componentsSeparatedByString:@"\n"];

        NSLog(@"Read in %ld lines of Unicode text from file",  [listArray count]);
        for (NSString *textLine in listArray)
            shapedText = [indexedFont GetShapedText: textLine];
            element = [eb CreateShapedTextRun: shapedText];
            PTMatrix2D *m1 = [[PTMatrix2D alloc] initWithA: 1.5 b: 0 c: 0 d: 1.5 h: 50 v: linePos];
            [element SetTextMatrixWithMatrix2D: m1];
            NSLog(@"Wrote shaped line to page");
        // Finish the shaped block of text
        [writer WriteElement: [eb CreateTextEnd]];

        [writer End];  // save changes to the current page
        [doc PagePushBack: page];
        [doc SaveToFile: @"../../TestFiles/Output/unicodewrite.pdf" flags: e_ptremove_unused | e_pthex_strings];
        NSLog(@"Done. Result saved in unicodewrite.pdf...");
        [PTPDFNet Terminate: 0];            
        return ret;