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POunresolved external symbol public __thiscall only in debug mode
 

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  1. POunresolved external symbol public __thiscall only in debug mode
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    <p>I have looked around for posts trying to solve this error but in every case I am already doing what they have suggested. </p> <p>My compile output:</p> <blockquote> <p>main.obj:-1: error: LNK2019: unresolved external symbol "public: __thiscall KeyLogger::~KeyLogger(void)" (??1KeyLogger@@QAE@XZ) referenced in function _main</p> <p>main.obj:-1: error: LNK2019: unresolved external symbol "public: __thiscall KeyLogger::KeyLogger(void)" (??0KeyLogger@@QAE@XZ) referenced in function _main</p> <p>debug\AccipioKeyDemo.exe:-1: error: LNK1120: 2 unresolved externals</p> </blockquote> <p>I know that this is saying that I have the KeyLogger constructor and destructor defined but not implemented but I actually do have everything implemented.</p> <p>main.cpp</p> <pre><code>#include &lt;QCoreApplication&gt; #include "keylogger.h" int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); KeyLogger k; return a.exec(); } </code></pre> <p>keylogger.h</p> <pre><code>#ifndef KEYLOGGER_H #define KEYLOGGER_H #include &lt;Windows.h&gt; class KeyLogger { public: KeyLogger(); ~KeyLogger(); void start(); void stop(); private: HHOOK hook; LRESULT CALLBACK intercept(int code, WPARAM wparam, LPARAM lparam); }; #endif // KEYLOGGER_H </code></pre> <p>keylogger.cpp</p> <pre><code>#include "keylogger.h" #include &lt;QDebug&gt; KeyLogger::KeyLogger() : hook(NULL) { hook = SetWindowsHookEx(WH_KEYBOARD_LL, intercept, NULL,0); if (hook == NULL) { qDebug() &lt;&lt; "HOOK FAILED"; } else { qDebug() &lt;&lt; "HOOK SUCCESS"; } } KeyLogger::~KeyLogger() { } void KeyLogger::start() { qDebug() &lt;&lt; "start"; } void KeyLogger::stop() { qDebug() &lt;&lt; "stop"; } LRESULT CALLBACK KeyLogger::intercept(int code, WPARAM wparam, LPARAM lparam) { qDebug() &lt;&lt; "Key Pressed"; return CallNextHookEx(hook, code, wparam, lparam); } </code></pre> <p>QT Pro config</p> <pre><code>#------------------------------------------------- # # Project created by QtCreator 2013-10-10T19:58:51 # #------------------------------------------------- QT += core QT -= gui TARGET = AccipioKeyDemo CONFIG += console CONFIG -= app_bundle LIBS += user32.lib TEMPLATE = app SOURCES += main.cpp \ keylogger.cpp HEADERS += \ keylogger.h </code></pre>
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    1. COWhy do you need to include `#include <Windows.h>` in KeyLogger.h?
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    2. CObecause the HHOOK macro is defined in Windows.h
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    3. COYour indication of your understanding of the error is correct. You need to post more details about your build environment. Are you using make? qmake? visual studio? Post the project files!
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