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 of 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 |
); |
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.
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 codepage. The console's codepage defaults initially to the system's OEM codepage. To change the console's codepage, use the SetConsoleCP or SetConsoleOutputCP functions, or use the chcp or mode con cp select= commands.
CHAR_INFO, COORD, ReadConsoleOutputAttribute, ReadConsoleOutputCharacter, SetConsoleCP, SetConsoleOutputCP, SMALL_RECT, WriteConsoleOutput
file: /Techref/os/win/api/win32/func/src/f71_6.htm, 7KB, , updated: 2000/4/7 11:19, local time: 2024/12/24 18:02,
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