Scrolling a Screen Buffer's Window
Important
This document describes console platform functionality that is no longer a part of our ecosystem roadmap. We do not recommend using this content in new products, but we will continue to support existing usages for the indefinite future. Our preferred modern solution focuses on virtual terminal sequences for maximum compatibility in cross-platform scenarios. You can find more information about this design decision in our classic console vs. virtual terminal document.
The SetConsoleWindowInfo function can be used to scroll the contents of a screen buffer in the console window. This function can also change the window size. The function can either specify the new upper left and lower right corners of the console screen buffer's window as absolute screen buffer coordinates or specify the changes from the current window coordinates. The function fails if the specified window coordinates are outside the boundaries of the console screen buffer.
The following example scrolls the view of the console screen buffer up by modifying the window coordinates returned by the GetConsoleScreenBufferInfo function. The ScrollByAbsoluteCoord function demonstrates how to specify absolute coordinates, while the ScrollByRelativeCoord function demonstrates how to specify relative coordinates.
#include <windows.h>
#include <stdio.h>
#include <conio.h>
HANDLE hStdout;
int ScrollByAbsoluteCoord(int iRows)
{
CONSOLE_SCREEN_BUFFER_INFO csbiInfo;
SMALL_RECT srctWindow;
// Get the current screen buffer size and window position.
if (! GetConsoleScreenBufferInfo(hStdout, &csbiInfo))
{
printf("GetConsoleScreenBufferInfo (%d)\n", GetLastError());
return 0;
}
// Set srctWindow to the current window size and location.
srctWindow = csbiInfo.srWindow;
// Check whether the window is too close to the screen buffer top
if ( srctWindow.Top >= iRows )
{
srctWindow.Top -= (SHORT)iRows; // move top up
srctWindow.Bottom -= (SHORT)iRows; // move bottom up
if (! SetConsoleWindowInfo(
hStdout, // screen buffer handle
TRUE, // absolute coordinates
&srctWindow)) // specifies new location
{
printf("SetConsoleWindowInfo (%d)\n", GetLastError());
return 0;
}
return iRows;
}
else
{
printf("\nCannot scroll; the window is too close to the top.\n");
return 0;
}
}
int ScrollByRelativeCoord(int iRows)
{
CONSOLE_SCREEN_BUFFER_INFO csbiInfo;
SMALL_RECT srctWindow;
// Get the current screen buffer window position.
if (! GetConsoleScreenBufferInfo(hStdout, &csbiInfo))
{
printf("GetConsoleScreenBufferInfo (%d)\n", GetLastError());
return 0;
}
// Check whether the window is too close to the screen buffer top
if (csbiInfo.srWindow.Top >= iRows)
{
srctWindow.Top =- (SHORT)iRows; // move top up
srctWindow.Bottom =- (SHORT)iRows; // move bottom up
srctWindow.Left = 0; // no change
srctWindow.Right = 0; // no change
if (! SetConsoleWindowInfo(
hStdout, // screen buffer handle
FALSE, // relative coordinates
&srctWindow)) // specifies new location
{
printf("SetConsoleWindowInfo (%d)\n", GetLastError());
return 0;
}
return iRows;
}
else
{
printf("\nCannot scroll; the window is too close to the top.\n");
return 0;
}
}
int main( void )
{
int i;
printf("\nPrinting twenty lines, then scrolling up five lines.\n");
printf("Press any key to scroll up ten lines; ");
printf("then press another key to stop the demo.\n");
for(i=0; i<=20; i++)
printf("%d\n", i);
hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
if(ScrollByAbsoluteCoord(5))
_getch();
else return 0;
if(ScrollByRelativeCoord(10))
_getch();
else return 0;
}