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examples: C interop for HTML to PDF conversion using libwkhtmltox (#7751)
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.github/workflows/ci.yml
vendored
4
.github/workflows/ci.yml
vendored
@ -80,6 +80,10 @@ jobs:
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sudo apt-get install --quiet -y libssl-dev sqlite3 libsqlite3-dev valgrind
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sudo apt-get install --quiet -y libglfw3 libglfw3-dev libfreetype6-dev libxi-dev libxcursor-dev libasound2-dev
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## sudo apt-get install --quiet -y libsdl2-dev libsdl2-ttf-dev libsdl2-mixer-dev libsdl2-image-dev
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## The following is needed for examples/wkhtmltopdf.v
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wget https://github.com/wkhtmltopdf/packaging/releases/download/0.12.6-1/wkhtmltox_0.12.6-1.focal_amd64.deb
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sudo apt-get install xfonts-75dpi xfonts-base
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sudo dpkg -i wkhtmltox_0.12.6-1.focal_amd64.deb
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- name: Build v
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run: |
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echo $VFLAGS
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@ -8,6 +8,8 @@ import sync
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import v.pref
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import v.util.vtest
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const github_job = os.getenv('GITHUB_JOB')
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pub struct TestSession {
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pub mut:
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files []string
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@ -113,6 +115,9 @@ pub fn new_test_session(_vargs string) TestSession {
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$if windows {
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skip_files << 'examples/x/websocket/ping.v' // requires OpenSSL
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}
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if github_job != 'ubuntu-tcc' {
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skip_files << 'examples/wkhtmltopdf.v' // needs installation of wkhtmltopdf from https://github.com/wkhtmltopdf/packaging/releases
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}
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vargs := _vargs.replace('-progress', '').replace('-progress', '')
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vexe := pref.vexe_path()
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new_vtmp_dir := setup_new_vtmp_folder()
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94
examples/wkhtmltopdf.v
Normal file
94
examples/wkhtmltopdf.v
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@ -0,0 +1,94 @@
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import os
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// Example of C interop for a very handy task.
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//
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// wkhtmltopdf and wkhtmltoimage are open source (LGPLv3) command line tools to
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// render HTML into PDF and various image formats using the Qt WebKit rendering
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// engine. These run entirely "headless" and do not require a display or display
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// service.
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//
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// https://github.com/wkhtmltopdf/wkhtmltopdf
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// https://wkhtmltopdf.org/downloads.html
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// https://wkhtmltopdf.org/libwkhtmltox/
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#flag -lwkhtmltox
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#include "wkhtmltox/pdf.h" # You can install the C package for your system from the wkhtmltopdf.org/downloads.html page
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struct C.wkhtmltopdf_global_settings {}
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struct C.wkhtmltopdf_object_settings {}
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struct C.wkhtmltopdf_converter {}
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fn C.wkhtmltopdf_init(use_graphics bool) int
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fn C.wkhtmltopdf_deinit() int
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fn C.wkhtmltopdf_version() charptr
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fn C.wkhtmltopdf_create_global_settings() &C.wkhtmltopdf_global_settings
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fn C.wkhtmltopdf_destroy_global_settings(global_settings &C.wkhtmltopdf_global_settings)
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fn wkhtmltopdf_set_global_setting(global_settings &C.wkhtmltopdf_global_settings, name charptr, value charptr) bool
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fn C.wkhtmltopdf_create_object_settings() &C.wkhtmltopdf_object_settings
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fn C.wkhtmltopdf_destroy_object_settings(object_settings &C.wkhtmltopdf_object_settings)
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fn C.wkhtmltopdf_set_object_setting(object_settings &C.wkhtmltopdf_object_settings, name charptr, value charptr) bool
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fn C.wkhtmltopdf_create_converter(global_settings &C.wkhtmltopdf_global_settings) &C.wkhtmltopdf_converter
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fn C.wkhtmltopdf_destroy_converter(converter &C.wkhtmltopdf_converter)
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fn C.wkhtmltopdf_add_object(converter &C.wkhtmltopdf_converter, object_settings &C.wkhtmltopdf_object_settings, data charptr)
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fn C.wkhtmltopdf_convert(converter &C.wkhtmltopdf_converter) bool
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fn C.wkhtmltopdf_http_error_code(converter &C.wkhtmltopdf_converter) int
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fn C.wkhtmltopdf_get_output(converter &C.wkhtmltopdf_converter, data &charptr) int
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fn main() {
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// init
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init := C.wkhtmltopdf_init(0)
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println('wkhtmltopdf_init: $init')
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version := C.wkhtmltopdf_version()
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println('wkhtmltopdf_version: $version')
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global_settings := C.wkhtmltopdf_create_global_settings()
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println('wkhtmltopdf_create_global_settings: ${voidptr(global_settings)}')
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object_settings := C.wkhtmltopdf_create_object_settings()
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println('wkhtmltopdf_create_object_settings')
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converter := C.wkhtmltopdf_create_converter(global_settings)
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println('wkhtmltopdf_create_converter: ${voidptr(converter)}')
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// convert
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mut result := C.wkhtmltopdf_set_object_setting(object_settings, 'page', 'http://www.google.com.br')
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println('wkhtmltopdf_set_object_setting: $result [page = http://www.google.com.br]')
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C.wkhtmltopdf_add_object(converter, object_settings, 0)
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println('wkhtmltopdf_add_object')
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result = C.wkhtmltopdf_convert(converter)
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println('wkhtmltopdf_convert: $result')
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error_code := C.wkhtmltopdf_http_error_code(converter)
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println('wkhtmltopdf_http_error_code: $error_code')
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if result {
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data := &charptr(0)
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size := C.wkhtmltopdf_get_output(converter, &data)
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println('wkhtmltopdf_get_output: $size bytes')
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mut file := os.open_file('./google.pdf', 'w+', 0o666) or {
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println('ERR: $err')
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return
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}
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wrote := file.write_bytes(data, size)
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println('write_bytes: $wrote [./google.pdf]')
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file.flush()
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file.close()
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}
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// destroy
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C.wkhtmltopdf_destroy_converter(converter)
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println('wkhtmltopdf_destroy_converter')
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C.wkhtmltopdf_destroy_object_settings(object_settings)
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println('wkhtmltopdf_destroy_object_settings: ${voidptr(object_settings)}')
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C.wkhtmltopdf_destroy_global_settings(global_settings)
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println('wkhtmltopdf_destroy_global_settings')
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deinit := C.wkhtmltopdf_deinit()
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println('wkhtmltopdf_deinit: $deinit')
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}
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