Qt5-Windows：不一致的dll链接错误和dllimport静态数据成员的定义不允许 [英] Qt5 - Windows : inconsistent dll linkage error and definition of dllimport static data member not allowed
问题描述
我正在尝试使用 Windows 10 和 Qt5.12 建立一个项目。该小程序正在使用似乎是 Windows 需要它的自己的包含（即 #include< windows .... ），但是在我的情况下， smtp 上面链接中的库没有任何 #include< windows> ，并且不知道是否必须生成它们。看来他们不是我发现的帖子
此外，我正在阅读这篇文章也是，因为我认为我可能会有用，但没有信息对您有帮助我解决了问题
我挖了更多东西，实际上去了 windows包括的位置，以下是我能够找到的路径，但是不知道这是否有用：
在我发帖的所有帖子中，问题似乎都存在，在这种情况下，对于 Windows 有关
.pro 文件的编写方式。在我的 .pro 文件下面。
请注意，我将此存储库克隆到了 windows 10 中。
.pro
QT + = quick quickcontrols2并发网络核心gui
CONFIG + = c ++ 11
＃以下定义使您的编译器在使用
时发出警告＃任何Qt功能已被标记为已弃用（确切的警告
＃取决于您的编译器）。请参阅不推荐使用
＃的API的文档，以了解如何从中移植代码。
定义+ = QT_DEPRECATED_WARNINGS
目标= SMTPEmail
模板= lib
定义+ = SMTP_BUILD
win32：CONFIG + = dll
＃如果使用过时的API，您也可以使代码无法编译。
＃为此，请取消注释以下行。
＃您还可以选择仅在特定版本的Qt之前禁用已弃用的API。
#DEFINES + = QT_DISABLE_DEPRECATED_BEFORE = 0x060000＃禁用所有在Qt 6.0.0之前弃用的API +
SOURCES + = \
main.cpp \
progressbardialog。 cpp \
robot.cpp \
robotmanager.cpp \
settings / emailaddress.cpp \
settings / mimeattachment.cpp \
settings / mimecontentformatter .cpp \
设置/mimefile.cpp \
设置/mimehtml.cpp \
设置/mimeinlinefile.cpp \
设置/mimemessage.cpp \
设置/mimemultipart.cpp \
设置/mimepart.cpp \
设置/mimetext.cpp \
设置/quotedprintable.cpp \
设置/ smtpclient。 cpp \
user.cpp \
usermanager.cpp
资源+ = qml.qrc
＃用于解析QML模块的附加导入路径在Qt Creator的代码模型中
QML_IMPORT_PATH =
＃用于为Qt快速设计器解析QML模块
QML_DESIGNER_IMPORT_PATH =
HEADERS + = \
progressbardialog.h \
robot.h \
robotmanager .h \
设置/ SmtpMime \
设置/emailaddress.h \
设置/mimeattachment.h \
设置/mimecontentformatter.h \
settings / mimefile.h \
settings / mimehtml.h \
settings / mimeinlinefile.h \
settings / mimemessage.h \
settings / mimemultipart.h ＼ ＼
设置/mimepart.h \
设置/mimetext.h \
设置/quotedprintable.h \
设置/smtpclient.h \
设置/smtpexports.h \
user.h \
usermanager.h
编辑
更具体地讲，似乎每个有问题的标头如下：
class SMTP_EXPORT EmailAddress：public QObject //<-SMTP_EXPORT
会导致 smtpexports.h ，我在下面复制了该文件：
#ifndef SMTPEXPORTS_H
＃定义SMTPEXPORTS_H
#ifdef SMTP_BUILD
＃定义SMTP_EXPORT Q_DECL_EXPORT
#else
＃定义SMTP_EXPORT Q_DECL_IMPORT
#endif
#endif // SMTPEXPORTS_H
附加编辑
添加 DEFINES + = SMTP_BUILD 后，几乎所有错误都得到解决，但是我还有两个错误，我在下面添加了一个打印屏幕：
非常感谢您为解决此问题指明了正确的方向。
文件设计为使用定义的 SMTP_BUILD 设置进行编译，在该设置中将源添加到库或可执行文件中。您必须添加
定义+ = SMTP_BUILD
到 pro 文件中。
I am trying to build a project using Windows 10 and Qt5.12. The small program is using the smtp protocol available here. I can confirm that on my Windows I have the OpenSSL 1.1.1c 28 May 2019.
On my Ubuntu 19.04 the same exact program compiles and run as usual but not on Windows.
I am attaching below a print screen of the errors; however those are mostly of two types:
1) inconsistent dll linkage
2) definition of dllimport static data member not allowed
Following this link it seems that Windows needs its "own" include (i.e. #include <windows....) however in my case the smtp library from the above link does not have any #include <windows> and don't know if they have to be generated. It seems they don't from the post I found
In addition I was reading this post too because I thought I could be useful but no information was useful to help me sort out the problem
I dug more and actually went to where the windows includes are and the following is the path I was able to find, but don't know if that could be useful:
From all the posts I red the problem seems to be, in this specific case for Windows on how the
.pro file is written. Below my .pro file.
Note that I cloned this repository into my windows 10.
.pro
QT += quick quickcontrols2 concurrent network core gui
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). Refer to the documentation for the
# deprecated API to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS
TARGET = SMTPEmail
TEMPLATE = lib
DEFINES += SMTP_BUILD
win32:CONFIG += dll
# 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
SOURCES += \
main.cpp \
progressbardialog.cpp \
robot.cpp \
robotmanager.cpp \
settings/emailaddress.cpp \
settings/mimeattachment.cpp \
settings/mimecontentformatter.cpp \
settings/mimefile.cpp \
settings/mimehtml.cpp \
settings/mimeinlinefile.cpp \
settings/mimemessage.cpp \
settings/mimemultipart.cpp \
settings/mimepart.cpp \
settings/mimetext.cpp \
settings/quotedprintable.cpp \
settings/smtpclient.cpp \
user.cpp \
usermanager.cpp
RESOURCES += qml.qrc
# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =
# Additional import path used to resolve QML modules just for Qt Quick Designer
QML_DESIGNER_IMPORT_PATH =
HEADERS += \
progressbardialog.h \
robot.h \
robotmanager.h \
settings/SmtpMime \
settings/emailaddress.h \
settings/mimeattachment.h \
settings/mimecontentformatter.h \
settings/mimefile.h \
settings/mimehtml.h \
settings/mimeinlinefile.h \
settings/mimemessage.h \
settings/mimemultipart.h \
settings/mimepart.h \
settings/mimetext.h \
settings/quotedprintable.h \
settings/smtpclient.h \
settings/smtpexports.h \
user.h \
usermanager.h
EDITS
To be even more specific it seems that every header the offending line is the following below:
class SMTP_EXPORT EmailAddress : public QObject // <-- SMTP_EXPORT
which leads to the smtpexports.h which I copied below:
#ifndef SMTPEXPORTS_H
#define SMTPEXPORTS_H
#ifdef SMTP_BUILD
#define SMTP_EXPORT Q_DECL_EXPORT
#else
#define SMTP_EXPORT Q_DECL_IMPORT
#endif
#endif // SMTPEXPORTS_H
ADDITIONAL EDITS
Almost all error are solved after adding DEFINES += SMTP_BUILD but I have two errors left and I added a print screen below:
Thank you very much for pointing in the right direction on how to solve this problem.
The files are designed to be compiled with the define SMTP_BUILD set where the source is added, either to a library or to an executable. You have to add the
DEFINES += SMTP_BUILD
to your pro file.
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