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POLNK Errors in Qt when trying to inherit?
 

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  1. POLNK Errors in Qt when trying to inherit?
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    <p>I'm attempting to call a method from another class Bookmarks, however I keep getting LNK errors when I build my program and I don't understand why.</p> <pre><code>mainwindow.obj:-1: error: LNK2019: unresolved external symbol "public: class QStringList __cdecl Bookmarks::getList(void)" (?getList@Bookmarks@@QEAA?AVQStringList@@XZ) referenced in function "private: void __cdecl MainWindow::on_save_book_clicked(void)" (?on_save_book_clicked@MainWindow@@AEAAXXZ) debug\WebBrowser.exe:-1: error: LNK1120: 1 unresolved externals </code></pre> <p>Of course, the second error exists because of the first one, at least that much I know.</p> <p>I've declared my headers, including the class I want to use:</p> <pre><code>#include "mainwindow.h" #include "ui_mainwindow.h" #include "bookmarks.h" </code></pre> <p>And this is the slot I'm trying to use:</p> <pre><code>void MainWindow::on_save_book_clicked() { Bookmarks *bm = new Bookmarks(); QStringList book = bm -&gt; getList(); QFileDialog *fd = new QFileDialog; QString fileName = fd -&gt; getSaveFileName(this, tr("Save Bookmarks"), "", tr("Bookmarks (*.txt);;AllFiles (*)")); if (fileName.isEmpty()) { return; } else { QFile file(fileName); if (!file.open(QIODevice::WriteOnly)) { QMessageBox::information(this, tr("Unable to open file"), file.errorString()); } return; QDataStream out(&amp;file); out.setVersion(QDataStream::Qt_4_5); out &lt;&lt; bm; } } </code></pre> <p>I've determined that the error is coming from the line:</p> <pre><code>QStringList book = bm -&gt; getList(); </code></pre> <p>When I comment it out, I no longer get the link error, though I haven't a clue what problem it's causing. Why is this?</p>
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    1. USBoggy B
    1. USBoggy B
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    1. COIs Bookmark class defined in a shared library? Is getList() function actually defined?
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      1. POLNK Errors in Qt when trying to inherit?
      1. USvahancho
    2. COLinker errors are hard to solve without knowing the structure of your project. You have got to ask yourself can the linker reach `bookmarks.cpp` or `bookmarks.lib` (I assume that's how it's called), a good way to figure this out is to call another function of `Bookmarks` and see if that works.
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      1. POLNK Errors in Qt when trying to inherit?
      1. USSteve Van Opstal
    3. COhave you runned qmake after creating bookmarks class?
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      1. USUldisK
 

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