unresolved external symbol CONTENT_TYPE_HEADER and API_VERSION_HEADER #1235
Description
What platform/OS are you using?
Windows10,
Which version of the SDK?
1,7,182
What compiler are you using? what version?
Visual Studio 2019 16.2.4
What are your CMake arguments?
cmake .. -G "Visual Studio 16" -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=q:\SharedLibraries\aws32 -DBUILD_ONLY="email " -DENABLE_TESTING="OFF"
Can you provide a TRACE level log? (sanitize any sensitive information)
1>aws.test.cpp
1>aws.test.obj : error LNK2001: unresolved external symbol "char const * const Aws::Http::CONTENT_TYPE_HEADER" (?CONTENT_TYPE_HEADER@Http@Aws@@3PBDB)
1>aws.test.obj : error LNK2001: unresolved external symbol "char const * const Aws::Http::API_VERSION_HEADER" (?API_VERSION_HEADER@Http@Aws@@3PBDB)
1>..\GeneratedFiles\Debug32\\AtomixDevelopment.exe : fatal error LNK1120: 2 unresolved externals
1>Done building project "AtomixDevelopment.vcxproj" -- FAILED.
I'm testing AWS SDK but I'm not able to find out why these two symbols are missing.
- My project correctly including aws-cpp-sdk-core.lib and aws-cpp-sdk-email.lib
- There is no problem with another exported classes from these libraries.
- AWS SDK is generated through cmake and has defined
USE_WINDOWS_DLL_SEMANTICSandUSE_IMPORT_EXPORT(I tried USE_IMPORT_EXPORT as same as USE_IMPORT_EXPORT=1) - It seems that AWS_CORE_API is correctly configured as
#define AWS_CORE_API __declspec(dllexport)
Minimal test case:
#include <aws/core/Aws.h>
#include <aws/email/SESClient.h>
#include <aws/email/model/SendEmailRequest.h>
#include <aws/email/model/SendEmailResult.h>
#include <aws/email/model/Destination.h>
#include <aws/email/model/Message.h>
#include <aws/email/model/Body.h>
#include <aws/email/model/Content.h>
#pragma comment(lib, "q:\\SharedLibraries2019\\aws32\\bin\\aws-cpp-sdk-core.lib")
#pragma comment(lib, "q:\\SharedLibraries2019\\aws32\\bin\\aws-cpp-sdk-email.lib")
void test()
{
Aws::SDKOptions options;
Aws::InitAPI(options);
{
Aws::String message_body_html_data("html email");
Aws::String message_body_text_data("text email");
Aws::String message_subject_data("Migration to amazon");
Aws::String sender_email_address("ludek.vodicka@gmail.com");
Aws::String cc_address("ludek.vodicka@gmail.com");
Aws::String reply_to_address("ludek.vodicka@gmail.com");
Aws::SES::SESClient ses;
Aws::SES::Model::SendEmailRequest se_req;
}
Aws::ShutdownAPI(options);
}
Thanks for any hint.
Edit1:
I just also tried to update
extern AWS_CORE_API const char* API_VERSION_HEADER;
to
extern __declspec(dllexport) const char* API_VERSION_HEADER;
but still with the same result.
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ludekvodicka commentedon Sep 13, 2019
Just solved it.
It's necessary to define
#define USE_IMPORT_EXPORTbefore any include also in the application.After that,
AWS_CORE_APIis correctly defined in Core_EXPORTS.h as_declspec(dllimport)Not sure why this is necessary and why this is not mentioned in the documentation.
singku commentedon Sep 13, 2019
ludekvodicka commentedon Sep 13, 2019
You're right. I already found it also here https://github.com/aws/aws-sdk-cpp in "Using the SDK".
Thanks for the response.
guoyuanchao94 commentedon Nov 28, 2024
Hello, after five years,i miss this issue,and you help me slove this problem,thank you so much😘