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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
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1 # C bindings for zxing-cpp
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3 This is about the C-API of zxing-cpp. If you have any comments or feedback, please have a look at https://github.com/zxing-cpp/zxing-cpp/discussions/583.
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5 ## Installation
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7 To enable the C-API, the library needs to be configured with `cmake -DZXING_C_API=ON`.
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9 Probably the easiest way to play with the C-API is to just modify the [ZXingCTest.c](https://github.com/zxing-cpp/zxing-cpp/blob/master/wrappers/c/ZXingCTest.c) file.
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11 ## Usage
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13 The following is close to the most trivial use case scenario that is supported.
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15 ```c
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16 #include "ZXing/ZXingC.h"
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18 int main(int argc, char** argv)
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19 {
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20 int width, height;
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21 unsigned char* data;
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22 /* load your image data from somewhere. ZXing_ImageFormat_Lum assumes grey scale image data. */
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24 ZXing_ImageView* iv = ZXing_ImageView_new(data, width, height, ZXing_ImageFormat_Lum, 0, 0);
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26 ZXing_ReaderOptions* opts = ZXing_ReaderOptions_new();
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27 /* set ReaderOptions properties, if requried, e.g. */
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28 ZXing_ReaderOptions_setFormats(ZXing_BarcodeFormat_QRCode | ZXing_BarcodeFromat_EAN13);
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30 ZXing_Barcodes* barcodes = ZXing_ReadBarcodes(iv, opts);
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32 ZXing_ImageView_delete(iv);
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33 ZXing_ReaderOptions_delete(opts);
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35 if (barcodes) {
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36 for (int i = 0, n = ZXing_Barcodes_size(barcodes); i < n; ++i) {
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37 const ZXing_Barcode* barcode = ZXing_Barcodes_at(barcodes, i);
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39 char* format = ZXing_BarcodeFormatToString(ZXing_Barcode_format(barcode));
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40 printf("Format : %s\n", format);
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41 ZXing_free(format);
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43 char* text = ZXing_Barcode_text(barcode);
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44 printf("Text : %s\n", text);
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45 ZXing_free(text);
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46 }
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47 ZXing_Barcodes_delete(barcodes);
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48 } else {
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49 char* error = ZXing_LastErrorMsg();
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50 fprintf(stderr, "%s\n", error);
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51 ZXing_free(error);
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52 }
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54 return 0;
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55 }
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56 ```
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