error LNK2001: unresolved external symbol "char const * const Aws::Http::CONTENT_TYPE_HEADER" (?CONTENT_TYPE_HEADER@Http@Aws@@3QBDB) Aws::Http::API_VERSION_HEADER" (?API_VERSION_HEADER@Http@Aws@@3QBDB)

[GitZinger]

Confirm by changing [ ] to [x] below to ensure that it's a bug:

• I've gone though Developer Guide and API reference
• I've searched for previous similar issues and didn't find any solution

Describe the bug
A clear and concise description of what the bug is.
when calling the S3 functions, the program raised these error, and there is no aws-http.dll. after taking a glance at all s3 header files, did not find any other aws libraries modules to be needed
No idea how to fix it
SDK version number
1.8
Platform/OS/Hardware/Device
What are you running the sdk on?
win10
To Reproduce (observed behavior)
Steps to reproduce the behavior (please share code)

added s3 include/lib/dll files into project,
and tried to connect s3 and called the getobject function

Expected behavior
A clear and concise description of what you expected to happen.
working with aws s3
Logs/output
If applicable, add logs or error output.
error LNK2001: unresolved external symbol "char const * const Aws::Http::CONTENT_TYPE_HEADER" (?CONTENT_TYPE_HEADER@Http@Aws@@3QBDB)

error LNK2001: unresolved external symbol "char const * const Aws::Http::API_VERSION_HEADER" (?API_VERSION_HEADER@Http@Aws@@3QBDB)

fatal error LNK1120: 2 unresolved externals
To enable logging, set the following system properties:

REMEMBER TO SANITIZE YOUR PERSONAL INFO

options.loggingOptions.logLevel = Aws::Utils::Logging::LogLevel::Trace;
Aws::InitAPI(options)

Additional context
Add any other context about the problem here.

[KaibaLopez]

@GitZinger ,
This error usually happens if you have not added the preprocessor definitions:

USE_IMPORT_EXPORT
USE_WINDOWS_DLL_SEMANTICS

Can you verify that's not the case?

Also, make sure that your project matches the platform you built the SDK for, by default cmake builds on Release x64 and Visual Studio defaults to Debug x86 so there may be a problem there, so to avoid future hard to find errors make sure that when you set the project properties at the top they are the correct ones.

[GitZinger]

@KaibaLopez
Thank you. where and when should I put these?
in the main.cpp code?
or when building from the source???

But the weird thing is Putobject() is totally working.
the getobject() is not.
I mean they are both from the same library dll and header file.
I am using the official example
https://docs.aws.amazon.com/code-samples/latest/catalog/cpp-s3-get_object.cpp.html

How can two functions from the same library be so different?

[KaibaLopez]

the preprocessor defines are changed on the project properties:

right click on the project > Properties > Configuration Properties (on the left side menu) > C/C++ > Preprocessor > Preprocessor Definitions.

That is odd, but yea let me know if that fixes it for you.

[GitZinger]

Yes! it is working. it got compiled successfully. Thank you

[github-actions]

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