Integrating AWS S3 with Qt C++ (MSVC 2017 64 bit)

[viniltc]

Hi everyone,

I'm currently working on integrating AWS S3 with a Qt C++ application on a Windows-based PC. I successfully built and installed the AWS SDK using CMake, and I created a small Qt desktop application to test the AWS S3 functionality. However, I'm running into linker errors, which I suspect might be related to the build process of the AWS SDK.

Has anyone here successfully integrated AWS S3 with a Qt C++ application on Windows? If so, could you share the CMake configuration you used to build the AWS SDK?

Here’s what I’ve done so far to build the AWS SDK:

cmake .. -G "Visual Studio 15 2017 Win64" -DBUILD_ONLY="s3;core;transfer" -DBUILD_SHARED_LIBS=OFF -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX="C:\aws-sdk-cpp-install"

and in Qt .pro file I use something like this:

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# 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

# Include path for AWS SDK headers
INCLUDEPATH += C:/aws-sdk-cpp-install/include

# Link against the AWS SDK libraries
LIBS += -LC:/aws-sdk-cpp-install/lib \
    -laws-cpp-sdk-s3 \
    -laws-cpp-sdk-core \
    -laws-crt-cpp \
    -laws-checksums \
    -laws-c-event-stream \
    -laws-c-common \
    -laws-c-io \
    -laws-c-auth

SOURCES += \
    main.cpp \
    mainwindow.cpp

HEADERS += \
    mainwindow.h

FORMS += \
    mainwindow.ui


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

error building the app is as:

I would appreciate any advice or tips on the best CMake configuration to use the library in Qt C++ (with compiler MSVC 2017 64 bit) on Windows environment or any additional steps needed to resolve these linker errors.

Thanks in advance for your help!

[SGaist]

Hi,

Since you built the SDK statically, you have to ensure you pass the libraries in the correct order when linking to them.