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      std::freopen

      De cppreference.com
      < cpp | io | c

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      <metanoindex/>

       
      C++
       
      De entrada / saída da biblioteca
      I / O manipuladores
      C estilo de I / O
      Buffers
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      Buffers
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      (obsoleta)
      Streams
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      Streams
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      Abstrações
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      Abstractions
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      File I / O
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      File I/O
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      Cordas I / O
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      String I/O
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      Matriz de I / O
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      Array I/O
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      (obsoleta)
      (obsoleta)
      (obsoleta)
      Tipos
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      Types
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      Interface de categoria de erro
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      Error category interface
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      (C++11)
      (C++11)
       
      C estilo de I / O
      Funções
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      Functions
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      Arquivo de acesso
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      File access
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      Directa de entrada / saída
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      Direct input/output
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      Não formatado entrada / saída
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      Unformatted input/output
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      Formatado de entrada / saída
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      Formatted input/output
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      Arquivo de posicionamento
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      File positioning
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      De tratamento de erros
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      Error handling
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      Operações em arquivos
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      Operations on files
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      <tbody> </tbody>
      Definido no cabeçalho <cstdio>
      FILE *freopen( const char *filename, const char *mode, FILE *stream );
      Reatribui um stream córrego existente para um arquivo diferente, identificado por filenameusing modo especificado. mode é usado para determinar o modo de acesso novo arquivo.
      Original:
      Reassigns an existing file stream stream to a different file identified by filenameusing specified mode. mode is used to determine the new file access mode.
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      Parâmetros

      filename -
      Nome do arquivo para associar o fluxo de arquivo
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      file name to associate the file stream to
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      mode -
      terminada em nulo cadeia de caracteres que determina o modo de acesso do novo arquivo
      File access
      mode string       		Meaning Explanation Action if file
      already exists       		Action if file
      does not exist
      "r" read Open a file for reading read from start failure to open
      "w" write Create a file for writing destroy contents create new
      "a" append Append to a file write to end create new
      "r+" read extended Open a file for read/write read from start error
      "w+" write extended Create a file for read/write destroy contents create new
      "a+" append extended Open a file for read/write write to end create new
      File access mode flag "b" can optionally be specified to open a file in binary mode. This flag has effect only on Windows systems.
      On the append file access modes, data is written to the end of the file regardless of the current position of the file position indicator.
      Original:
      null-terminated character string determining new file access mode
      File access
      mode string       		Meaning Explanation Action if file
      already exists       		Action if file
      does not exist
      "r" read Open a file for reading read from start failure to open
      "w" write Create a file for writing destroy contents create new
      "a" append Append to a file write to end create new
      "r+" read extended Open a file for read/write read from start error
      "w+" write extended Create a file for read/write destroy contents create new
      "a+" append extended Open a file for read/write write to end create new
      File access mode flag "b" can optionally be specified to open a file in binary mode. This flag has effect only on Windows systems.
      On the append file access modes, data is written to the end of the file regardless of the current position of the file position indicator.
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      stream -
      o fluxo de arquivos para modificar
      Original:
      the file stream to modify
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      Valor de retorno

      stream no sucesso NULL, em caso de falha
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      stream on success, NULL on failure
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      Exemplo

      O código a seguir redireciona stdout para um arquivo
      Original:
      The following code redirects stdout to a file
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      #include <cstdio>

int main()
{
    std::printf("stdout is printed to console");
    std::freopen("redir.txt", "w", stdout);
    std::printf("stdout is redirected to a file")
    std::fclose(stdout);
}

      Saída: 

      stdout is printed to console

      Veja também
      abre um arquivo
      Original:
      opens a file
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      (função) [edit]
      fecha um arquivo
      Original:
      closes a file
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      (função) [edit]
      Documentação C para freopen
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