Launch引数指定 #55
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Launch引数指定 #55
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Chikurin1014
reviewed
Aug 5, 2024
| index_specified = PythonExpression([index, ">= 0"]) | ||
| indexed_imshow = imshow_node( | ||
| name=["imshow_", index], | ||
| remappings=[("/app/camera_image", ["/packet/camera_image_", index])], |
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["/packet/camera_image_", index]は文字列の結合のようなことをしているのでしょうか？
f"/packet/camera_image_{index}"などしないのは、indexがLaunchConfiguration()の返り値であることと関係がありますか？
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文字列の結合のようなことをしているのでしょうか？
はい。
indexがLaunchConfiguration()の返り値であることと関係がありますか？
はい。これはlaunchファイルのsubstitutionという機能で、launchの実行時に文字列の結合が行われます。例えばros2 launch --show-args imshow imshow_launch.pyではlaunchの読み込みのみが行われて該当部分の文字列の結合は発生しません。
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