Qt中创建的C++库如何直接生成DLL到总项目的bin文件中

原创已于 2022-01-21 10:19:19 修改 · 745 阅读

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于 2022-01-19 08:30:43 首次发布

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本文介绍如何在Qt项目中配置C++库以生成并正确部署DLL文件至项目的bin目录。通过设置pro文件中的DESTDIR参数指定DLL的目标路径，并解决debug与release模式下DLL缺失的问题。

Qt中创建的C++库如何直接生成DLL到总项目的bin文件中,以下代码为C++库的pro文件的内容

QT -= gui
QT += serialport

TARGET = IGTC
TEMPLATE = lib
DEFINES += IGTC_LIBRARY

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

#Following code is generate DLL files to "D:\build-CarDetectorV2-Desktop_Qt_5_14_2_MinGW_32_bit-Debug\bin" folder
DESTDIR = ../bin

SOURCES += \
    atreceiverbuffer.cpp \
    igtc.cpp

HEADERS += \
    IGTC_global.h \
    atreceiverbuffer.h \
    igtc.h

# Default rules for deployment.
unix {
    target.path = /usr/lib
}
!isEmpty(target.path): INSTALLS += target

win32:CONFIG(release, debug|release): LIBS += -L$$OUT_PWD/./release/ -lIGTC
else:win32:CONFIG(debug, debug|release): LIBS += -L$$OUT_PWD/./debug/ -lIGTC
else:unix: LIBS += -L$$OUT_PWD/./ -lIGTC

INCLUDEPATH += $$PWD/.
DEPENDPATH += $$PWD/.

，其中有一行是起这个作用，那就是：

#Following code is generate DLL files to "D:\build-CarDetectorV2-Desktop_Qt_5_14_2_MinGW_32_bit-Debug\bin" folder
DESTDIR = ../bin

另外：
含有c++ library的Qt项目在debug编译时可以正常运行，改为release模式后，提示:找不到IGTC.DLL文件。
原因如下：因为在release/IGTC/release目录下找不到这个文件导致。
解决方案：从debug/IGTC/debug目录下拷贝IGTC.DLL到release/IGTC/release文件夹下，再编译即运行成功！
要想在发布文件夹下有IGTC.DLL文件，必须保证在ICTC/release文件夹下有该文件才能发布到bin文件夹下，否则不行！

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