Raphael10提出的问题 -coding

Raphael10

Asked: 2024-11-06 17:03:51 +0800 CST

/usr/local/bin/xmllint：编译 webkitgtk-2.46.3 时未定义符号：xmlMemSize

5

在编译最新稳定版本 webkitgtk-2.46.3 期间我收到此错误：

raphy@raohy:~/Downloads/webkitgtk-2.46.3$ cmake --build builddir/

[ 92%] Built target WebCore_CopyPrivateHeaders
[ 92%] Built target WebKit-forwarding-headers
[ 92%] Generating ../../WebKitGTK/DerivedSources   
/ModernMediaControlsGResourceBundle.c,     ../../WebKitGTK/DerivedSources 
/ModernMediaControlsGResourceBundle.c.deps
 /usr/local/bin/xmllint: symbol lookup error: /usr/local/bin/xmllint: undefined symbol: xmlMemSize
/home/raphy/Downloads/webkitgtk-2.46.3/builddir/WebKitGTK/DerivedSources    /ModernMediaControlsGResourceBundle.xml: Child process exited with code 127.

但检测到了合适的 xml2 库：

raphy@raohy:~/Downloads$ tar -xf webkitgtk-2.46.3.tar.xz
raphy@raohy:~/Downloads$ cd webkitgtk-2.46.3/
raphy@raohy:~/Downloads/webkitgtk-2.46.3$

raphy@raohy:~/Downloads/webkitgtk-2.46.3$ cmake -B builddir -DPORT=GTK    
-DUSE_GSTREAMER_WEBRTC=TRUE -DENABLE_WEB_RTC=ON -DUSE_GTK4=OFF
-- The C compiler identification is GNU 12.3.0
-- The CXX compiler identification is GNU 13.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
 CMake Warning at Source/cmake/WebKitCommon.cmake:10 (message):
  No CMAKE_BUILD_TYPE value specified, defaulting to RelWithDebInfo.
Call Stack (most recent call first):
  CMakeLists.txt:16 (include)

-- Found LibXml2: /usr/lib/x86_64-linux-gnu/libxml2.so (found suitable version "2.9.14", minimum  required is "2.8.0")   // <---------------------------------------------------------

libxml2 libxml2-dev libxml2-utils安装的已经是最新版本：

raphy@raohy:~$ sudo apt-get install libxml2 libxml2-dev libxml2-utils
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
libxml2 is already the newest version (2.9.14+dfsg-1.3ubuntu3).
libxml2-dev is already the newest version (2.9.14+dfsg-1.3ubuntu3).
libxml2-utils is already the newest version (2.9.14+dfsg-1.3ubuntu3).

操作系统：Ubuntu 24.04

我错过了什么？如何让它工作？

Raphael10

Asked: 2024-02-17 18:35:29 +0800 CST

如何为 Tesseract 正确定义 CMakeLists.txt？

6

我想用CMake这个简单的tesseract C++ 代码进行编译和构建：

// https://tesseract-ocr.github.io/tessdoc/Examples_C++.html
#include <tesseract/baseapi.h>
#include <leptonica/allheaders.h>

int main()
{
    char *outText;

    tesseract::TessBaseAPI *api = new tesseract::TessBaseAPI();
    // Initialize tesseract-ocr with English, without specifying tessdata path
    if (api->Init(NULL, "eng")) {
        fprintf(stderr, "Could not initialize tesseract.\n");
        exit(1);
    }

    // Open input image with leptonica library
    Pix *image = pixRead("phototest.tif");
    api->SetImage(image);
    // Get OCR result
    outText = api->GetUTF8Text();
    printf("OCR output:\n%s", outText);

    // Destroy used object and release memory
    api->End();
    delete api;
    delete [] outText;
    pixDestroy(&image);

    return 0;
}

有了这个CMakeLists.txt文件：

cmake_minimum_required(VERSION 3.5)
project(BasicExample)

set(CMAKE_CXX_STANDARD 17)

find_package(PkgConfig REQUIRED)

pkg_check_modules(tesseract REQUIRED IMPORTED_TARGET tesseract)
pkg_check_modules(leptonica REQUIRED IMPORTED_TARGET lept)
pkg_check_moduleS(libcurl REQUIRED IMPORTED_TARGET libcurl)

add_executable(${PROJECT_NAME} WIN32 MACOSX_BUNDLE BasicExample.cpp)


target_link_libraries(BasicExample PUBLIC
    PkgConfig::leptonica
    PkgConfig::tesseract
    -lcurl
)

我收到这些错误：

raphy@raohy:~/tesseract/Examples$ cmake -B builddir
-- The C compiler identification is GNU 12.3.0
-- The CXX compiler identification is GNU 13.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found PkgConfig: /usr/bin/pkg-config (found version "1.8.1")
-- Checking for module 'tesseract'
--   Found tesseract, version 5.3.4
-- Checking for module 'lept'
--   Found lept, version 1.82.0
-- Checking for module 'libcurl'
--   Found libcurl, version 8.2.1
-- Configuring done (0.3s)
-- Generating done (0.0s)
-- Build files have been written to: /home/raphy/tesseract/Examples/builddir
raphy@raohy:~/tesseract/Examples$ 
raphy@raohy:~/tesseract/Examples$ cmake --build builddir/
[ 50%] Building CXX object CMakeFiles/BasicExample.dir/BasicExample.cpp.o
[100%] Linking CXX executable BasicExample
/usr/bin/ld: /usr/local/lib/libtesseract.a(baseapi.cpp.o): in function `tesseract::TessBaseAPI::ProcessPagesInternal(char const*, char const*, int, tesseract::TessResultRenderer*)::{lambda(char const*)#1}::operator()(char const*) const':
baseapi.cpp:(.text+0x13): undefined reference to `curl_easy_strerror'
/usr/bin/ld: baseapi.cpp:(.text+0x3b): undefined reference to `curl_easy_cleanup'
/usr/bin/ld: /usr/local/lib/libtesseract.a(baseapi.cpp.o): in function `tesseract::TessBaseAPI::ProcessPagesInternal(char const*, char const*, int, tesseract::TessResultRenderer*)':
baseapi.cpp:(.text+0xad07): undefined reference to `curl_easy_init'
/usr/bin/ld: baseapi.cpp:(.text+0xad48): undefined reference to `curl_easy_setopt'
/usr/bin/ld: baseapi.cpp:(.text+0xad5d): undefined reference to `curl_easy_strerror'
/usr/bin/ld: baseapi.cpp:(.text+0xad89): undefined reference to `curl_easy_cleanup'
/usr/bin/ld: baseapi.cpp:(.text+0xb26f): undefined reference to `curl_easy_setopt'
/usr/bin/ld: baseapi.cpp:(.text+0xb298): undefined reference to `curl_easy_setopt'
/usr/bin/ld: baseapi.cpp:(.text+0xb2c1): undefined reference to `curl_easy_setopt'
/usr/bin/ld: baseapi.cpp:(.text+0xb2fa): undefined reference to `curl_easy_setopt'
/usr/bin/ld: baseapi.cpp:(.text+0xb324): undefined reference to `curl_easy_setopt'
/usr/bin/ld: /usr/local/lib/libtesseract.a(baseapi.cpp.o):baseapi.cpp:(.text+0xb3c9): more undefined references to `curl_easy_setopt' follow
/usr/bin/ld: /usr/local/lib/libtesseract.a(baseapi.cpp.o): in function `tesseract::TessBaseAPI::ProcessPagesInternal(char const*, char const*, int, tesseract::TessResultRenderer*)':
baseapi.cpp:(.text+0xb455): undefined reference to `curl_easy_perform'
/usr/bin/ld: baseapi.cpp:(.text+0xb6b0): undefined reference to `curl_easy_cleanup'
/usr/bin/ld: /usr/local/lib/libtesseract.a(tessdatamanager.cpp.o): in function `tesseract::TessdataManager::LoadArchiveFile(char const*)':
tessdatamanager.cpp:(.text+0x199): undefined reference to `archive_read_new'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x1ad): undefined reference to `archive_read_support_filter_all'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x1b5): undefined reference to `archive_read_support_format_all'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x1c5): undefined reference to `archive_read_open_filename'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x1e6): undefined reference to `archive_entry_pathname'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x1f6): undefined reference to `archive_read_next_header'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x208): undefined reference to `archive_read_free'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x294): undefined reference to `archive_entry_size'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x2e1): undefined reference to `archive_read_data'
collect2: error: ld returned 1 exit status
gmake[2]: *** [CMakeFiles/BasicExample.dir/build.make:99: BasicExample] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/BasicExample.dir/all] Error 2
gmake: *** [Makefile:91: all] Error 2

但是这个 CMakeLists.txt ：

# https://stackoverflow.com/questions/28165518/use-libcurl-undefined-reference-to-curl-easy-init
cmake_minimum_required(VERSION 3.5)
project(Url2File)

set(CMAKE_CXX_STANDARD 17)

find_package(PkgConfig REQUIRED)

pkg_check_modules(libcurl REQUIRED IMPORTED_TARGET libcurl)

add_executable(${PROJECT_NAME} WIN32 MACOSX_BUNDLE url2file.c)

target_link_libraries(${PROJECT_NAME} PUBLIC
    -lcurl
)

对于这个 libcurl 用法示例：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include <curl/curl.h>

static size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream)
{
  size_t written = fwrite(ptr, size, nmemb, (FILE *)stream);
  return written;
}

int main(int argc, char *argv[])
{
  CURL *curl_handle;
  static const char *pagefilename = "page.out";
  FILE *pagefile;

  if(argc < 2) {
    printf("Usage: %s <URL>\n", argv[0]);
    return 1;
  }

  curl_global_init(CURL_GLOBAL_ALL);

  /* init the curl session */
  curl_handle = curl_easy_init();

  /* set URL to get here */
  curl_easy_setopt(curl_handle, CURLOPT_URL, argv[1]);

  /* Switch on full protocol/debug output while testing */
  curl_easy_setopt(curl_handle, CURLOPT_VERBOSE, 1L);

  /* disable progress meter, set to 0L to enable it */
  curl_easy_setopt(curl_handle, CURLOPT_NOPROGRESS, 1L);

  /* send all data to this function  */
  curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, write_data);

  /* open the file */
  pagefile = fopen(pagefilename, "wb");
  if(pagefile) {

    /* write the page body to this file handle */
    curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, pagefile);

    /* get it! */
    curl_easy_perform(curl_handle);

    /* close the header file */
    fclose(pagefile);
  }

  /* cleanup curl stuff */
  curl_easy_cleanup(curl_handle);

  curl_global_cleanup();

  return 0;
}

工作正常：

raphy@raohy:~/curlExample$ cmake --build builddir/
[ 50%] Building C object CMakeFiles/Url2File.dir/url2file.c.o
[100%] Linking C executable Url2File
[100%] Built target Url2File

更新1)

我尝试仅保留 lcurl 作为 target_link_libraries：

target_link_libraries(BasicExample PUBLIC
    #PkgConfig::leptonica
    #PkgConfig::tesseract
    -lcurl
)

实际上，有关 libcurl 的错误消失了：

raphy@raohy:~/tesseract/Examples$ cmake --build builddir/
-- Configuring done (0.0s)
-- Generating done (0.0s)
-- Build files have been written to: /home/raphy/tesseract/Examples/builddir
[ 50%] Building CXX object CMakeFiles/BasicExample.dir/BasicExample.cpp.o
[100%] Linking CXX executable BasicExample
/usr/bin/ld: CMakeFiles/BasicExample.dir/BasicExample.cpp.o: in function `main':
BasicExample.cpp:(.text+0x37): undefined reference to `tesseract::TessBaseAPI::TessBaseAPI()'
/usr/bin/ld: BasicExample.cpp:(.text+0x98): undefined reference to `pixRead'
/usr/bin/ld: BasicExample.cpp:(.text+0xaf): undefined reference to `tesseract::TessBaseAPI::SetImage(Pix*)'
/usr/bin/ld: BasicExample.cpp:(.text+0xbb): undefined reference to `tesseract::TessBaseAPI::GetUTF8Text()'
/usr/bin/ld: BasicExample.cpp:(.text+0xe6): undefined reference to `tesseract::TessBaseAPI::End()'
/usr/bin/ld: BasicExample.cpp:(.text+0x11d): undefined reference to `pixDestroy'
/usr/bin/ld: CMakeFiles/BasicExample.dir/BasicExample.cpp.o: in function `tesseract::TessBaseAPI::Init(char const*, char const*)':
BasicExample.cpp:(.text._ZN9tesseract11TessBaseAPI4InitEPKcS2_[_ZN9tesseract11TessBaseAPI4InitEPKcS2_]+0x43): undefined reference to `tesseract::TessBaseAPI::Init(char const*, char const*, tesseract::OcrEngineMode, char**, int, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const*, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const*, bool)'
collect2: error: ld returned 1 exit status
gmake[2]: *** [CMakeFiles/BasicExample.dir/build.make:97: BasicExample] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/BasicExample.dir/all] Error 2
gmake: *** [Makefile:91: all] Error 2

但是得到了 tesseract 和 leptonica 的链接错误

基于这篇文章的答案：Use libcurl undefined reference to 'curl_easy_init' , -lcurlhas to be put in the end of gcc command 。那么...如何正确链接它们呢？

有了这个CmakeLists.txt：

cmake_minimum_required(VERSION 3.5)
project(BasicExample)

set(CMAKE_CXX_STANDARD 17)

find_package(PkgConfig REQUIRED)

pkg_check_modules(tesseract REQUIRED IMPORTED_TARGET tesseract)
pkg_check_modules(leptonica REQUIRED IMPORTED_TARGET lept)
pkg_check_moduleS(libcurl REQUIRED IMPORTED_TARGET libcurl)

add_executable(${PROJECT_NAME} WIN32 MACOSX_BUNDLE BasicExample.cpp)


target_link_libraries(BasicExample PUBLIC
    PkgConfig::leptonica
    PkgConfig::tesseract
    -lcurl
)

这是以下的输出/builddir$ make VERBOSE=1：

raphy@raohy:~/tesseract/Examples/builddir$ make VERBOSE=1
/usr/local/bin/cmake -S/home/raphy/tesseract/Examples -B/home/raphy/tesseract/Examples/builddir --check-build-system CMakeFiles/Makefile.cmake 0
/usr/local/bin/cmake -E cmake_progress_start /home/raphy/tesseract/Examples/builddir/CMakeFiles /home/raphy/tesseract/Examples/builddir//CMakeFiles/progress.marks
make  -f CMakeFiles/Makefile2 all
make[1]: Entering directory '/home/raphy/tesseract/Examples/builddir'
make  -f CMakeFiles/BasicExample.dir/build.make CMakeFiles/BasicExample.dir/depend
make[2]: Entering directory '/home/raphy/tesseract/Examples/builddir'
cd /home/raphy/tesseract/Examples/builddir && /usr/local/bin/cmake -E cmake_depends "Unix Makefiles" /home/raphy/tesseract/Examples /home/raphy/tesseract/Examples /home/raphy/tesseract/Examples/builddir /home/raphy/tesseract/Examples/builddir /home/raphy/tesseract/Examples/builddir/CMakeFiles/BasicExample.dir/DependInfo.cmake "--color="
Dependencies file "CMakeFiles/BasicExample.dir/BasicExample.cpp.o.d" is newer than depends file "/home/raphy/tesseract/Examples/builddir/CMakeFiles/BasicExample.dir/compiler_depend.internal".
Consolidate compiler generated dependencies of target BasicExample
make[2]: Leaving directory '/home/raphy/tesseract/Examples/builddir'
make  -f CMakeFiles/BasicExample.dir/build.make CMakeFiles/BasicExample.dir/build
make[2]: Entering directory '/home/raphy/tesseract/Examples/builddir'
[ 50%] Linking CXX executable BasicExample
/usr/local/bin/cmake -E cmake_link_script CMakeFiles/BasicExample.dir/link.txt --verbose=1
/usr/bin/c++ CMakeFiles/BasicExample.dir/BasicExample.cpp.o -o BasicExample  -lcurl /usr/lib/x86_64-linux-gnu/liblept.so /usr/local/lib/libtesseract.a
/usr/bin/ld: /usr/local/lib/libtesseract.a(baseapi.cpp.o): in function `tesseract::TessBaseAPI::ProcessPagesInternal(char const*, char const*, int, tesseract::TessResultRenderer*)::{lambda(char const*)#1}::operator()(char const*) const':
baseapi.cpp:(.text+0x13): undefined reference to `curl_easy_strerror'
/usr/bin/ld: baseapi.cpp:(.text+0x3b): undefined reference to `curl_easy_cleanup'
/usr/bin/ld: /usr/local/lib/libtesseract.a(baseapi.cpp.o): in function `tesseract::TessBaseAPI::ProcessPagesInternal(char const*, char const*, int, tesseract::TessResultRenderer*)':
baseapi.cpp:(.text+0xad07): undefined reference to `curl_easy_init'
/usr/bin/ld: baseapi.cpp:(.text+0xad48): undefined reference to `curl_easy_setopt'
/usr/bin/ld: baseapi.cpp:(.text+0xad5d): undefined reference to `curl_easy_strerror'
/usr/bin/ld: baseapi.cpp:(.text+0xad89): undefined reference to `curl_easy_cleanup'
/usr/bin/ld: baseapi.cpp:(.text+0xb26f): undefined reference to `curl_easy_setopt'
/usr/bin/ld: baseapi.cpp:(.text+0xb298): undefined reference to `curl_easy_setopt'
/usr/bin/ld: baseapi.cpp:(.text+0xb2c1): undefined reference to `curl_easy_setopt'
/usr/bin/ld: baseapi.cpp:(.text+0xb2fa): undefined reference to `curl_easy_setopt'
/usr/bin/ld: baseapi.cpp:(.text+0xb324): undefined reference to `curl_easy_setopt'
/usr/bin/ld: /usr/local/lib/libtesseract.a(baseapi.cpp.o):baseapi.cpp:(.text+0xb3c9): more undefined references to `curl_easy_setopt' follow
/usr/bin/ld: /usr/local/lib/libtesseract.a(baseapi.cpp.o): in function `tesseract::TessBaseAPI::ProcessPagesInternal(char const*, char const*, int, tesseract::TessResultRenderer*)':
baseapi.cpp:(.text+0xb455): undefined reference to `curl_easy_perform'
/usr/bin/ld: baseapi.cpp:(.text+0xb6b0): undefined reference to `curl_easy_cleanup'
/usr/bin/ld: /usr/local/lib/libtesseract.a(tessdatamanager.cpp.o): in function `tesseract::TessdataManager::LoadArchiveFile(char const*)':
tessdatamanager.cpp:(.text+0x199): undefined reference to `archive_read_new'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x1ad): undefined reference to `archive_read_support_filter_all'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x1b5): undefined reference to `archive_read_support_format_all'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x1c5): undefined reference to `archive_read_open_filename'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x1e6): undefined reference to `archive_entry_pathname'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x1f6): undefined reference to `archive_read_next_header'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x208): undefined reference to `archive_read_free'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x294): undefined reference to `archive_entry_size'
/usr/bin/ld: tessdatamanager.cpp:(.text+0x2e1): undefined reference to `archive_read_data'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/BasicExample.dir/build.make:99: BasicExample] Error 1
make[2]: Leaving directory '/home/raphy/tesseract/Examples/builddir'
make[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/BasicExample.dir/all] Error 2
make[1]: Leaving directory '/home/raphy/tesseract/Examples/builddir'
make: *** [Makefile:91: all] Error 2
raphy@raohy:~/tesseract/Examples/builddir$

我缺少什么？如何使 CMakeLists.txt 适用于 tesseract C++ 代码示例？

Raphael10

Asked: 2024-02-05 20:36:52 +0800 CST

如何以编程方式更改 HTML 段落中单个单词的样式？

5

我想以编程方式更改 HTML 段落中单个单词的样式

let textToSearch = "testing"

let beforeNode = document.createElement('p');
let afterNode = document.createElement('p');

let highlightedSpan = document.createElement('span')
highlightedSpan.innerHTML = textToSearch;
highlightedSpan.style.backgroundColor = "yellow"
let newPar = document.createElement('p');
newPar.appendChild(highlightedSpan);

document.querySelectorAll('p').forEach((par) => {
  let cont = par.textContent;
  let startingPos = cont.indexOf(textToSearch)
  console.log(startingPos)
  if (startingPos !== -1) {
    let firstPart = cont.slice(0, startingPos - 1)
    let thirdPart = cont.slice(startingPos + textToSearch.length, cont.length - 1)
    beforeNode.appendChild(document.createTextNode(firstPart))
    afterNode.appendChild(document.createTextNode(thirdPart))
    par.replaceWith(beforeNode, highlightedSpan, afterNode)
  }
})

<p> A complete text for testing purposes</p>

我得到这个输出：

但我想了解是否有一种视觉上更好（现在文本内容在视觉上分布在三行）、更清晰的方法来更改 HTML 段落的单个单词的样式

/usr/local/bin/xmllint：编译 webkitgtk-2.46.3 时未定义符号：xmlMemSize

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如何以编程方式更改 HTML 段落中单个单词的样式？

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