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Convert html string to pdf using wkhtmltopdf C library (wkhtmltox)

I am trying to convert an html string to pdf using the wkhtmltopdf C library. I checked the sample that comes with the installer and I compiled and converted the page successfully. Here is the code I used for reference.

wkhtmltopdf_global_settings * gs;
wkhtmltopdf_object_settings * os;
wkhtmltopdf_converter * c;

wkhtmltopdf_init(false);

gs = wkhtmltopdf_create_global_settings();

wkhtmltopdf_set_global_setting(gs, "out", "test.pdf");

os = wkhtmltopdf_create_object_settings();

wkhtmltopdf_set_object_setting(os, "page", "https://www.google.com.ph");

c = wkhtmltopdf_create_converter(gs);

wkhtmltopdf_set_progress_changed_callback(c, progress_changed);

wkhtmltopdf_set_phase_changed_callback(c, phase_changed);

wkhtmltopdf_set_error_callback(c, error);

wkhtmltopdf_set_warning_callback(c, warning);

wkhtmltopdf_add_object(c, os, NULL);

if (!wkhtmltopdf_convert(c))
    fprintf(stderr, "Convertion failed!");

printf("httpErrorCode: %d\n", wkhtmltopdf_http_error_code(c));

wkhtmltopdf_destroy_converter(c);

wkhtmltopdf_deinit();

I suspect changing the parameters of a function

   wkhtmltopdf_set_object_setting(os, "page", "https://www.google.com.ph");

to something like

   wkhtmltopdf_set_object_setting(os, [name of setting], [html string]);

will do the job, however the documentation does not provide any name for a particular parameter other than the one included in the sample, which is a "page".

I may have missed this in the documentation, or it may not be the correct way to do it. Any suggestion would be much appreciated.

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3 answers


Thanks for watching this time. I ended up with a workaround. Instead of a string, I passed in the local path of the generated html file. This is not the solution I am looking for, but it does the same thing. Thanks again.



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void wkhtmltopdf_add_object(wkhtmltopdf_converter * converter,
       wkhtmltopdf_object_settings * settings, const char * data)


You can specify a non-zero parameter data

pointing to a UTF-8 encoded HTML string to be converted to PDF instead page

.

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Yaroslav had the right idea.

Use the wkhtmltopdf_set_object_setting (os, "page", data) function, but instead of a string representing a website URL, prefix your HTML string with a data URI.

For example:

const char *pszText = "data:text/html,<!DOCTYPE html><HTML><HEAD> .... </HTML>";

wkhtmltopdf_set_object_setting(os, "page", pszText);

Works like a champion. I even introduced small images on the page with div.x: before specifying the data: image / png; base64 as the content url.

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