Four unresolved external symbol when generating static library for function "pcdownsample"

Question

zzm oliver 2023-10-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2030874-four-unresolved-external-symbol-when-generating-static-library-for-function-pcdownsample

评论： zzm oliver 2023-10-12

采纳的回答： Supreeth Subbaraya

Steps to reproduce:

1. Write simple function which just wrap a call to the cv toolbox function "pcdownsample"

2. Write a simple script that calls the function. The script refered to the first example of the help page of the "pcdownsample".

3. Use Coder app, specify "mypcdownsample" as the function to be translated, specify "run_mypcdownsample" as the running code to define input types. Modify the input type to "inf×3" and choose c++ static library as the wanted build type. Select "vs 2019 project | cmake 64-bit" as the toolchain. Below are snapshots of the matlab coder:

4. Open the sln, create a new project, add the auto-generated example files(main.h main.cpp) to this project. Replace the trivial init function with my own correct function which reads the "teapot.txt" file. Also add some folders to the "additional include directories" so that vs could find the headers.

5. Build the solution. VS complained about "unresolved external symbol", both in "debug" and "release" mode.

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Answer 1

Supreeth Subbaraya 2023-10-11

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2030874-four-unresolved-external-symbol-when-generating-static-library-for-function-pcdownsample#answer_1331149

This issue is because a few of the libraries required are not linked. Here is a workaround you can try to resolve the issue:

Obtain the required files and libraries using the packNGo function. This creates a .zip folder with all the files required

Load the buildInfo.mat from the 'codegen' directory, into your workspace
>> packNGo(buildInfo)

Extract the files and in your visual studio and then configure the linker settings.

In solution explorer at the right side, right click on your project, then click properties
Go to, Linker -> General, add the packNGo Folder to the "Additional Library Directories"
Go to, Linker -> Input, add the required libraries as additional dependencies. Add the libraries mypcdownsample.lib, libmwkdtree.lib and libmwvoxelGridFilter.lib (see below screenshot as reference)