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我在构建示例应用程序时遇到了链接错误，这个（https://github.com/tdlib/td/blob/master/example/cpp/td_example.cpp）我在 Qt creator 中创建了项目并将 td_example.cpp 添加到项目。以前我也使用此指令从源构建 32x Td 库https://tdlib.github.io/td/build.html?language=C%2B%2B。

位于此路径 K:\QtProjects\Telegram\TelegramDependency\td\tdlib 中的 Td 工件，这里有 3 个文件夹（bin、include 和 lib）。

在 bin 文件夹中，有 4 个 .dll 文件（libcrypto-1_1.dll、libssl-1_1.dll、tdjson.dll、zlibd1.dll）

在 lib 文件夹中（tdactor.lib、tdapi.lib、tdclient.lib、tdcore.lib、tddb.lib、tdjson.lib、tdjson_private.lib、tdjson_static.lib、tdnet.lib、tdsqlite.lib、tdutils.lib）

我的项目位于此路径下 K:\QtProjects\Telegram\TelegramTestAPP

在 TelegramTestAPP 文件夹中，我有包含此类内容的 .pro 文件。

QT += quick

CONFIG += c++20

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
        Logger.cpp \
        main.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 =

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

HEADERS += \
    Logger.h \
    td_example.h


win32: LIBS += -L'$$PWD/../TelegramDependency/td/tdlib/lib/' -ltdjson


INCLUDEPATH += $$PWD/../TelegramDependency/td/tdlib/include
DEPENDPATH += $$PWD/../TelegramDependency/td/tdlib/include

我从 td_example.cpp 中删除了 main 函数并重命名为 td_example.h ，之后我包含了这个头文件并在 main 函数中从 main.cpp 调用它

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>
#include "td_example.h"

int main(int argc, char *argv[])
{
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
#endif

    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;

    engine.rootContext()->setContextProperty(QStringLiteral("CLogger"), &Logger::GetInstance());

    const QUrl url(QStringLiteral("qrc:/main.qml"));
    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                     &app, [url](QObject *obj, const QUrl &objUrl) {
        if (!obj && url == objUrl)
            QCoreApplication::exit(-1);
    }, Qt::QueuedConnection);

    engine.load(url);

    TdExample example;
    example.loop();

    return app.exec();
}

所以问题是，为什么我得到错误的链接错误示例

main.obj:-1: error: LNK2019: unresolved external symbol "public: __thiscall td::td_api::tdlibParameters::tdlibParameters(void)" (??0tdlibParameters@td_api@td@@QAE@XZ) referenced in function "class td::tl::unique_ptr<class td::td_api::tdlibParameters> __cdecl td::td_api::make_object<class td::td_api::tdlibParameters>(void)" (??$make_object@VtdlibParameters@td_api@td@@$$V@td_api@td@@YA?AV?$unique_ptr@VtdlibParameters@td_api@td@@@tl@1@XZ)

编译器：Microsoft Visual C++ Complier 14.0 (amd64_x86) 我还将所有 .dll 从 bin 文件夹复制到调试文件夹 (TelegramTestAPP/build/debug)

编辑将所有静态库添加到 .pro 文件

win32: LIBS += -L'$$PWD/../TelegramDependency/td/tdlib/lib/' -ltdapi
win32: LIBS += -L'$$PWD/../TelegramDependency/td/tdlib/lib/' -ltdutils
win32: LIBS += -L'$$PWD/../TelegramDependency/td/tdlib/lib/' -ltdclient
win32: LIBS += -L'$$PWD/../TelegramDependency/td/tdlib/lib/' -ltdnet
win32: LIBS += -L'$$PWD/../TelegramDependency/td/tdlib/lib/' -ltdcore
win32: LIBS += -L'$$PWD/../TelegramDependency/td/tdlib/lib/' -ltdsqlite
win32: LIBS += -L'$$PWD/../TelegramDependency/td/tdlib/lib/' -ltdactor
win32: LIBS += -L'$$PWD/../TelegramDependency/td/tdlib/lib/' -ltddb


INCLUDEPATH += $$PWD/../TelegramDependency/td/tdlib/include
DEPENDPATH += $$PWD/../TelegramDependency/td/tdlib/include


win32: PRE_TARGETDEPS += $$PWD/../TelegramDependency/td/tdlib/lib/tdcore.lib
win32: PRE_TARGETDEPS += $$PWD/../TelegramDependency/td/tdlib/lib/tdapi.lib
win32: PRE_TARGETDEPS += $$PWD/../TelegramDependency/td/tdlib/lib/tdclient.lib
win32: PRE_TARGETDEPS += $$PWD/../TelegramDependency/td/tdlib/lib/tdutils.lib
win32: PRE_TARGETDEPS += $$PWD/../TelegramDependency/td/tdlib/lib/tdactor.lib
win32: PRE_TARGETDEPS += $$PWD/../TelegramDependency/td/tdlib/lib/tddb.lib
win32: PRE_TARGETDEPS += $$PWD/../TelegramDependency/td/tdlib/lib/tdnet.lib
win32: PRE_TARGETDEPS += $$PWD/../TelegramDependency/td/tdlib/lib/tdsqlite.lib

win32: LIBS += -L'C:/Program Files (x86)/OpenSSL-Win32/lib/VC/' -llibcrypto32MDd
win32: LIBS += -L'C:/Program Files (x86)/OpenSSL-Win32/lib/VC/' -llibssl32MDd

INCLUDEPATH += 'C:/Program Files (x86)/OpenSSL-Win32/include'
DEPENDPATH += 'C:/Program Files (x86)/OpenSSL-Win32/include'

新错误（编译器 gcc 32 位）

error: undefined reference to `td::ClientManager::execute(td::tl::unique_ptr<td::td_api::Function>&&)'
debug/TdController.o: In function `ZN12TdControllerC2Ev':
error: undefined reference to `td::td_api::setLogVerbosityLevel::setLogVerbosityLevel(int)'
debug/TdController.o: In function `ZN2td6td_api11make_objectINS0_20setLogVerbosityLevelEJiEEENS_2tl10unique_ptrIT_EEDpOT0_':
error: undefined reference to `vtable for td::td_api::setLogVerbosityLevel'
debug/TdController.o: In function `ZN2td6td_api20setLogVerbosityLevel

D1Ev'：

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1 回答 1

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我不知道那些库，但根据这个https://core.telegram.org/tdlib/docs/classtd_1_1td__api_1_1tdlib_parameters-members.html，您缺少的符号来自 td_api，它似乎没有链接。您是否尝试链接到其他库，特别是 tdapi.lib？

于 2021-03-28T16:05:07.053 回答