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6258 :: NOOB: How to get "cAlternateFileName" from WIN32_FIND_DATA data structure ...

• RobertNio (orginal) [2020-04-26T10:03:38+02:00] view original

  Hi,

  thanks for all the help I got so far ... NIM is a treasure :)

  Ok, now I am stuck at a CONVERSION from a WideCString string to a string in NIM. I know I have to use cast to link to the address of the CString, however ... I get errors ...

  Here is my code with comments:

  
  import winlean, nimpy
  
  proc    findFirstFile(a: string, b: var WIN32_FIND_DATA): Handle =
          result = findFirstFileW(newWideCString(a), b)
  
  proc    findNextFileW*(hFindFile: Handle, lpFindFileData: var WIN32_FIND_DATA): int32
          {.stdcall, dynlib: "kernel32", importc: "FindNextFileW", sideEffect.}
  
  template    getFilename(f: untyped): untyped =
              $cast[WideCString](addr(f.cAlternateFileName[0]))
  
  proc test*(file: string): WIN32_FIND_DATA {.exportpy.} =
          
          var FileInfo: WIN32_FIND_DATA
          var Handle = findFirstFile(file, FileInfo)
          
          #[
          tried THIS:
                  
                  echo FileInfo.cAlternateFileName
          
          ==> ERROR MSG
              Error: type mismatch: got <array[0..259, Utf16Char]>
              but expected one of:
              proc echo(x: varargs[typed, `$`])
                  first type mismatch at position: 1
                  required type for x: varargs[typed]
                  but expression 'FileInfo.cAlternateFileName' is of type: array[0..259, Utf16Char]
              
              expression: echo FileInfo.cAlternateFileName
          
          
          
          tried THIS:
                  
                  echo getFilename(FileInfo)
          
          ==> ERROR MSG
              Error: type mismatch: got <Utf16Char>
              but expected one of:
              proc unknownTypeCompileError()
                first type mismatch at position: 1
                extra argument given
              
              expression: unknownTypeCompileError(v)
          
          ]#
          
          result = FileInfo
  Run

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• Ward (orginal) [2020-04-26T11:01:55+02:00] view original

  You can use winim and winstr .

  Example:

  import winim/lean
  
  var ffd: WIN32_FIND_DATA
  var hFind = FindFirstFile("*.*", ffd)
  if hFind != INVALID_HANDLE_VALUE:
    defer:
      FindClose(hFind)
    
    while true:
      block method1:
        var buffer = T(MAX_PATH)
        # buffer maybe wstring or mstring depends on -d:useWinAnsi
        
        buffer << ffd.cFileName
        # copy cFileName to buffer
        
        buffer.nullTerminate
        # set corrent length of buffer
        
        echo buffer
      
      block method2:
        echo (%$ffd.cFileName).nullTerminated
        # `$` for array cause ambiguous call since 0.2.0, use %$ instead
      
      if FindNextFile(hFind, &ffd) == 0: break
  
  Run

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