cmake函數: get_filename_component

get_filename_component:獲取完整文件名的特定部分

---

目錄

• get_filename_component(<var> <Filename> <mode> [CACHE])
• get_filename_component(<var> <FileName> <mode> [BASE_DIR <dir>] [CACHE])
• get_filename_component(<var> <FileNae> PROGRAM [PROGRAM_ARGS <arg_var>] [CACHE])

get_filename_component(<var> <Filename> <mode> [CACHE])

• 字符串解析處理

• 的可取值范圍：

  • DICECTORY：沒有文件名的目錄，路徑返回時帶有正斜杠，並且沒有尾部斜杠。
  • NAME：不帶名錄的文件名
  • EXT：文件名的最長擴展名
  • NAME_WE：不帶目錄或最長擴展名的文件名
  • LAST_EXT：文件名的最后擴展名
  • NAME_WLE：文件目錄或最后擴展名的文件名
  • PATH：DIRECTORY的就別名（cmake <= 2.8.11）

SET(filename /tmp/cmake.dat.log.tmp)
get_filename_component(d ${filename} DIRECTORY)
get_filename_component(n ${filename} NAME ABSOLUTE)
get_filename_component(nw ${filename} NAME_WE ABSOLUTE)
get_filename_component(nwl ${filename} NAME_WLE ABSOLUTE)
get_filename_component(e ${filename} EXT ABSOLUTE)
get_filename_component(le ${filename} LAST_EXT ABSOLUTE)

message("${filename} DIRECTOYR:${d}")
message("${filename} NAME:${n}")
message("${filename} NAME_WE:${nw}")
message("${filename} NAME_WLE:${nwl}")
message("${filename} EXT:${e}")
message("${filename} LAST_EXT:${le}")

# output
/tmp/cmake.data.log.tmp DIRECTOYR:/tmp
/tmp/cmake.data.log.tmp NAME:cmake.dat.log.tmp
/tmp/cmake.data.log.tmp NAME_WE:cmake
/tmp/cmake.data.log.tmp NAME_WLE:cmake.dat.log
/tmp/cmake.data.log.tmp EXT:.dat.log.tmp
/tmp/cmake.data.log.tmp LAST_EXT:.tmp

---

get_filename_component(<var> <FileName> <mode> [BASE_DIR <dir>] [CACHE])

• 指定路徑與文件名進行拼接

• 可取值范圍為

  • ABSOLUTE：文件的完整路徑

  get_filename_component(absolute_file_name "cmake.dat" ABSOLUTE)
  message("CMAKE_CURRENT_SOURCE_DIR: ${CMAKE_CURRENT_SOURCE_DIR}")
  message("absolute_file_name: ${absolute_file_name}")
  
  set(base_dir "/tmp/")
  get_filename_component(absolute_file_name "cmake.dat" ABSOLUTE BASE_DIR ${base_dir})
  message("absolute_file_name: ${absolute_file_name}")
  
  # output
  CMAKE_CURRENT_SOURCE_DIR: /home/fl/tmp/test_cmake
  absolute_file_name: /home/fl/tmp/test_cmake/cmake.dat
  absolute_file_name: /tmp/cmake.dat
  

  • REALPATH：如果 為鏈接文件，則顯示完整路徑

  get_filename_component(relative_file_name "srs_tree" REALPATH)
  message("CMAKE_CURRENT_SOURCE_DIR: ${CMAKE_CURRENT_SOURCE_DIR}")
  message("relative_file_name: ${relative_file_name}")
  
  set(base_dir "/test_source/")
  get_filename_component(relative_file_name "test_tree" REALPATH BASE_DIR ${base_dir})
  message("relative_file_name: ${relative_file_name}")
  
  # output
  CMAKE_CURRENT_SOURCE_DIR: /home/fl/tmp/av_io
  relative_file_name: /home/fl/test_tree
  relative_file_name: /test_source/srs_tree
  

---

get_filename_component(<var> <FileNae> PROGRAM [PROGRAM_ARGS <arg_var>] [CACHE])

獲取應用程序的名稱和參數

get_filename_component(program "ls -l -h" PROGRAM PROGRAM_ARGS args)
message("program: ${program}")
message("args: ${args}")

# output 系統可識別程序
program: /usr/bin/ls
args:  -l -h

get_filename_component(program "lm -l -h" PROGRAM PROGRAM_ARGS args)
message("program: ${program}")
message("args: ${args}")

# output 不可識別程序
program: 
args: