Qt5-鏈接pHash庫“未定義參考”

Question

我想添加一個名為pHash的外部庫。 我將此添加到.pro文件：

win32:CONFIG(release, debug|release): LIBS += -L$PWD/Libs/pHash-0.9.4/release -lpHash
else:win32:CONFIG(debug, debug|release): LIBS += -L$PWD/Libs/pHash-0.9.4/debug -lpHash

INCLUDEPATH += $PWD/Libs/pHash-0.9.4
DEPENDPATH += $PWD/Libs/pHash-0.9.4

win32:CONFIG(release, debug|release): PRE_TARGETDEPS += $PWD/Libs/pHash-0.9.4/release/pHash.lib
else:win32:CONFIG(debug, debug|release): PRE_TARGETDEPS += $PWD/Libs/pHash-0.9.4/debug/pHash.lib

但是該庫的任何功能都沒有起作用。 當我嘗試使用一個時，出現構建錯誤“對pHashFunction的未定義引用”。 有一個使用示例：

#include "myclass.h"

#define HAVE_IMAGE_HASH 1 // config
#include "pHash.h"

void MyClass::perform() {
    const char *msg = ph_about();
    qDebug() << msg;
}

然后是構建日志：

C:/Qt/Tools/mingw492_32/bin/mingw32-make -f Makefile.Debug clean
mingw32-make[1]: Entering directory 'C:/Users/vi/Documents/Programmation/QtWorkspace/build-myProject-Desktop_Qt_5_5_0_MinGW_32bit-Debug'
rm -f debug/qrc_qml.cpp
rm -f debug/moc_myclass.cpp
rm -f debug/main.o debug/myclass.o debug/qrc_qml.o debug/moc_myclass.o
mingw32-make[1]: Leaving directory 'C:/Users/vi/Documents/Programmation/QtWorkspace/build-myProject-Desktop_Qt_5_5_0_MinGW_32bit-Debug'
C:/Qt/Tools/mingw492_32/bin/mingw32-make -f Makefile.Release clean
mingw32-make[1]: Entering directory 'C:/Users/vi/Documents/Programmation/QtWorkspace/build-myProject-Desktop_Qt_5_5_0_MinGW_32bit-Debug'
rm -f release/qrc_qml.cpp
rm -f release/moc_myclass.cpp
rm -f release/main.o release/myclass.o release/qrc_qml.o release/moc_myclass.o
mingw32-make[1]: Leaving directory 'C:/Users/vi/Documents/Programmation/QtWorkspace/build-myProject-Desktop_Qt_5_5_0_MinGW_32bit-Debug'
01:31:34: Le processus "C:\Qt\Tools\mingw492_32\bin\mingw32-make.exe" s'est terminé normalement.
01:31:34: Configuration inchangée, étape qmake sautée.
01:31:34: Débute : "C:\Qt\Tools\mingw492_32\bin\mingw32-make.exe" 
C:/Qt/Tools/mingw492_32/bin/mingw32-make -f Makefile.Debug
mingw32-make[1]: Entering directory 'C:/Users/vi/Documents/Programmation/QtWorkspace/build-myProject-Desktop_Qt_5_5_0_MinGW_32bit-Debug'
g++ -c -pipe -fno-keep-inline-dllexport -g -frtti -Wall -Wextra -fexceptions -mthreads -DUNICODE -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../myProject -I. -I../myProject/Libs/pHash-0.9.4 -IC:/Qt/5.5/mingw492_32/include -IC:/Qt/5.5/mingw492_32/include/QtQuick -IC:/Qt/5.5/mingw492_32/include/QtGui -IC:/Qt/5.5/mingw492_32/include/QtANGLE -IC:/Qt/5.5/mingw492_32/include/QtQml -IC:/Qt/5.5/mingw492_32/include/QtNetwork -IC:/Qt/5.5/mingw492_32/include/QtCore -Idebug -IC:/Qt/5.5/mingw492_32/mkspecs/win32-g++  -o debug/main.o ../myProject/main.cpp
g++ -c -pipe -fno-keep-inline-dllexport -g -frtti -Wall -Wextra -fexceptions -mthreads -DUNICODE -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../myProject -I. -I../myProject/Libs/pHash-0.9.4 -IC:/Qt/5.5/mingw492_32/include -IC:/Qt/5.5/mingw492_32/include/QtQuick -IC:/Qt/5.5/mingw492_32/include/QtGui -IC:/Qt/5.5/mingw492_32/include/QtANGLE -IC:/Qt/5.5/mingw492_32/include/QtQml -IC:/Qt/5.5/mingw492_32/include/QtNetwork -IC:/Qt/5.5/mingw492_32/include/QtCore -Idebug -IC:/Qt/5.5/mingw492_32/mkspecs/win32-g++  -o debug/myclass.o ../myProject/myclass.cpp
In file included from ../myProject/myclass.cpp:3:0:
../myProject/Libs/pHash-0.9.4/pHash.h:299:21: warning: 'cimg_library::CImg<float>* ph_dct_matrix(int)' declared 'static' but never defined [-Wunused-function]
 static CImg<float>* ph_dct_matrix(const int N);
                     ^
'C:\Qt\5.5\mingw492_32\bin\rcc.exe' -name qml ../myProject/qml.qrc -o debug/qrc_qml.cpp
g++ -c -pipe -fno-keep-inline-dllexport -g -frtti -Wall -Wextra -fexceptions -mthreads -DUNICODE -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../myProject -I. -I../myProject/Libs/pHash-0.9.4 -IC:/Qt/5.5/mingw492_32/include -IC:/Qt/5.5/mingw492_32/include/QtQuick -IC:/Qt/5.5/mingw492_32/include/QtGui -IC:/Qt/5.5/mingw492_32/include/QtANGLE -IC:/Qt/5.5/mingw492_32/include/QtQml -IC:/Qt/5.5/mingw492_32/include/QtNetwork -IC:/Qt/5.5/mingw492_32/include/QtCore -Idebug -IC:/Qt/5.5/mingw492_32/mkspecs/win32-g++  -o debug/qrc_qml.o debug/qrc_qml.cpp
'C:\Qt\5.5\mingw492_32\bin\moc.exe' -DUNICODE -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -D__GNUC__ -DWIN32 -IC:/Qt/5.5/mingw492_32/mkspecs/win32-g++ -IC:/Users/vi/Documents/Programmation/QtWorkspace/myProject -IC:/Users/vi/Documents/Programmation/QtWorkspace/myProject/Libs/pHash-0.9.4 -IC:/Qt/5.5/mingw492_32/include -IC:/Qt/5.5/mingw492_32/include/QtQuick -IC:/Qt/5.5/mingw492_32/include/QtGui -IC:/Qt/5.5/mingw492_32/include/QtANGLE -IC:/Qt/5.5/mingw492_32/include/QtQml -IC:/Qt/5.5/mingw492_32/include/QtNetwork -IC:/Qt/5.5/mingw492_32/include/QtCore -I. ../myProject/myclass.h -o debug/moc_myclass.cpp
g++ -c -pipe -fno-keep-inline-dllexport -g -frtti -Wall -Wextra -fexceptions -mthreads -DUNICODE -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_NEEDS_QMAIN -I../myProject -I. -I../myProject/Libs/pHash-0.9.4 -IC:/Qt/5.5/mingw492_32/include -IC:/Qt/5.5/mingw492_32/include/QtQuick -IC:/Qt/5.5/mingw492_32/include/QtGui -IC:/Qt/5.5/mingw492_32/include/QtANGLE -IC:/Qt/5.5/mingw492_32/include/QtQml -IC:/Qt/5.5/mingw492_32/include/QtNetwork -IC:/Qt/5.5/mingw492_32/include/QtCore -Idebug -IC:/Qt/5.5/mingw492_32/mkspecs/win32-g++  -o debug/moc_myclass.o debug/moc_myclass.cpp
g++ -Wl,-subsystem,windows -mthreads -o debug/myProject.exe debug/main.o debug/myclass.o debug/qrc_qml.o debug/moc_myclass.o  -lmingw32 -LC:/Qt/5.5/mingw492_32/lib -lqtmaind -lshell32 -LC:/Users/vi/Documents/Programmation/QtWorkspace/myProject/Libs/pHash-0.9.4/debug -lpHash -lQt5Quickd -lQt5Guid -lQt5Qmld -lQt5Networkd -lQt5Cored 
debug/myclass.o: In function `ZN6myclass7performEv':
C:\Users\vi\Documents\Programmation\QtWorkspace\build-myProject-Desktop_Qt_5_5_0_MinGW_32bit-Debug/../myProject/myclass.cpp:11: undefined reference to `ph_about'
collect2.exe: error: ld returned 1 exit status
Makefile.Debug:83: recipe for target 'debug/myProject.exe' failed
mingw32-make[1]: *** [debug/myProject.exe] Error 1
mingw32-make[1]: Leaving directory 'C:/Users/vi/Documents/Programmation/QtWorkspace/build-myProject-Desktop_Qt_5_5_0_MinGW_32bit-Debug'
makefile:34: recipe for target 'debug' failed
mingw32-make: *** [debug] Error 2

預先感謝您的幫助 ：）

Answer 1

嘗試將.c和.cpp添加到您的項目中（dirent.c，ph_fft.c，pHash.cpp，phcomplex.c），但我認為問題在於.dll和.lib不在與您的Qt版本兼容，因為它是使用Visual Studio編譯的。

Answer 2

庫pHash不再受支持，並且存在許多問題。

1. Qt使用的編譯器MinGW 4.9.2與MSVC內置的.dll文件不兼容。

2. 僅使用技巧“ MSVC和MinGW DLL”是不夠的，因為沒有從pHash.dll導出函數ph_about() ，例如，在Windows上構建pHash庫。

3. 可以將所有pHash文件集成到Qt項目中，因此可以將庫與應用程序一起構建。 因為庫項目是為Visual Studio准備的，所以我想說Qt也應該基於VC。 但是，庫pHash很舊。 它是為Visual Studio 2008編寫的。現在，它已棄用Windows函數SHGetSpecialFolderPathA 。

4. 使用Qt MinGW 4.9.2編譯器編譯所有內容仍然是可行的。 在這種情況下，需要將DEFINES += HAVE_IMAGE_HASH=1到項目.pro文件中，以使該宏也能用於pHash編譯。 但是，要使用對圖像的本機支持，還應使用同一編譯器來編譯庫libjpeg和libpng ，例如， 編譯libjpeg。如果不使用圖像庫，則Cimg嘗試運行一些外部可執行文件gm.exe （可能來自GraphicsMagick）。

如果某個快速任務需要該庫，則可以考慮使用虛擬Linux，因為在這里可以直接使用它https://stackoverflow.com/a/33002746/4023446