zeichenwert an x/y in Konsole ermitteln



  • löchen,
    bräuchte für eine Konsolenapp eine Möglichkeit, an einer Position x,y den vorhandenen Zeichenwert auszulesen. Hab in den ganzen conio-Ersatzfunktionen leider nix finden können ... Toll wäre eine quick&dirty-Lösung, da ich nicht wirklich tief in den Konsolenkram rein mag.

    linus



  • Leider habe ich nix was auf Quick&Dirty passt, aber hier die Funktion die genau das macht:

    <MSDN 6.0 Auszug>

    ReadConsoleOutput
    The ReadConsoleOutput function reads character and color attribute data from a rectangular block of character cells in a console screen buffer, and the function writes the data to a rectangular block at a specified location in the destination buffer.

    BOOL ReadConsoleOutput(
    HANDLE hConsoleOutput, // handle to a console screen buffer
    PCHAR_INFO lpBuffer, // address of buffer that receives data
    COORD dwBufferSize, // column-row size of destination buffer
    COORD dwBufferCoord, // upper-left cell to write to
    PSMALL_RECT lpReadRegion // address of rectangle to read from
    );

    Parameters
    hConsoleOutput
    Handle to the screen buffer. The handle must have GENERIC_READ access.
    lpBuffer
    Pointer to a destination buffer that receives the data read from the screen buffer. This pointer is treated as the origin of a two-dimensional array of CHAR_INFO structures whose size is specified by the dwBufferSize parameter.
    dwBufferSize
    Specifies the size, in character cells, of the lpBuffer parameter. The X member of the COORD structure is the number of columns; the Y member is the number of rows.
    dwBufferCoord
    Specifies the coordinates of the upper-left cell in the lpBuffer parameter that receives the data read from the screen buffer. The X member of the COORD structure is the column, and the Y member is the row.
    lpReadRegion
    Pointer to a SMALL_RECT structure. On input, the structure members specify the upper-left and lower-right coordinates of the screen buffer rectangle from which the function is to read. On output, the structure members specify the actual rectangle that the function copied from.
    Return Values
    If the function succeeds, the return value is nonzero.

    If the function fails, the return value is zero. To get extended error information, call GetLastError.

    Remarks
    ReadConsoleOutput treats the screen buffer and the destination buffer as two-dimensional arrays (columns and rows of character cells). The rectangle pointed to by the lpReadRegion parameter specifies the size and location of the block to be read from the screen buffer. A destination rectangle of the same size is located with its upper-left cell at the coordinates of the dwBufferCoord parameter in the lpBuffer array. Data read from the cells in the screen buffer source rectangle is copied to the corresponding cells in the destination buffer. If the corresponding cell is outside the boundaries of the destination buffer rectangle (whose dimensions are specified by the dwBufferSize parameter), the data is not copied.

    Cells in the destination buffer corresponding to coordinates that are not within the boundaries of the screen buffer are left unchanged. In other words, these are the cells for which no screen buffer data is available to be read.

    Before ReadConsoleOutput returns, it sets the members of the structure pointed to by the lpReadRegion parameter to the actual screen buffer rectangle whose cells were copied into the destination buffer. This rectangle reflects the cells in the source rectangle for which there existed a corresponding cell in the destination buffer, because ReadConsoleOutput clips the dimensions of the source rectangle to fit the boundaries of the screen buffer.

    If the rectangle specified by lpReadRegion lies completely outside the boundaries of the screen buffer, or if the corresponding rectangle is positioned completely outside the boundaries of the destination buffer, no data is copied. In this case, the function returns with the members of the structure pointed to by the lpReadRegion parameter set such that the Right member is less than the Left, or the Bottom member is less than the Top. To determine the size of the screen buffer, use the GetConsoleScreenBufferInfo function.

    The ReadConsoleOutput function has no effect on the screen buffer's cursor position. The contents of the screen buffer are not changed by the function.

    Windows NT: This function uses either Unicode characters or 8-bit characters from the console's current code page. The console's code page defaults initially to the system's OEM code page. To change the console's code page, use the SetConsoleCP or SetConsoleOutputCP functions, or use the chcp or mode con cp select= commands.

    QuickInfo
    Windows NT: Requires version 3.1 or later.
    Windows: Requires Windows 95 or later.
    Windows CE: Unsupported.
    Header: Declared in wincon.h.
    Import Library: Use kernel32.lib.
    Unicode: Implemented as Unicode and ANSI versions on Windows NT.

    Sieht bloß viel aus, kopier dir den Rumpf rein füll aus und fertig 😉

    MfG SideWinder



  • Das Monster hatte ich auch schon gefunden ... Aber zumindest hab ich jetzt die Info, dass ich damit tatsächlich weiterkomme, war mir diesbezüglich nämlich so gar nicht sicher.

    Gruß & danke,
    linus



  • wer sagts denn, geht tatsächlich. Und vielleicht braucht ja jemand noch mal ne schnelle & dreckige Variante:

    // ANSI-Zeichenwert an Konsolenposition x/y zurückgeben
    CHAR readxy(int x, int y)
    {
    CHAR_INFO charInfo; // Puffer für Charakter (ANSI/UNICODE) und Farbattribut
    SMALL_RECT sRect;
    COORD dwBufferSize, dwBufferCoord;

    dwBufferSize.X = dwBufferSize.Y = 1; // Puffergröße: 1 Zeichen
    dwBufferCoord.X = dwBufferCoord.Y = 0; // Zielzelle im Puffer
    sRect.Left = sRect.Right = x - 1; // Koordinate X, auf Startwert 0 umbiegen
    sRect.Bottom = sRect.Top = y - 1; // Koordinate Y, dto.

    ReadConsoleOutput(GetStdHandle(STD_OUTPUT_HANDLE), &charInfo,
    dwBufferSize, dwBufferCoord, &sRect);
    return(charInfo.Char.AsciiChar);
    } // CHAR readxy()


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