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prog.c
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prog.c
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// #define _CRT_SECURE_NO_WARNINGS
#include <windows.h>
#define NEW_WIDTH 100
#define NEW_HEIGHT 50
void error(const char *txt) {
char msg[200];
//
// StringCbPrintf should be used… however, I was unable
// to link it without CRT.
// StringCbPrintf(msg, 200, "%s: %d", txt, GetLastError());
//
wsprintfA(msg, "%s: %d", txt, GetLastError());
MessageBox(NULL, msg, "Error", 0);
}
int __stdcall go(void) {
HANDLE orig_con_h;
HANDLE repl_con_h;
CONSOLE_SCREEN_BUFFER_INFOEX orig_con_info;
COORD repl_con_buf_size;
SMALL_RECT repl_con_screen;
COORD cursor_pos;
orig_con_h = GetStdHandle(STD_OUTPUT_HANDLE);
orig_con_info.cbSize = sizeof(orig_con_info);
if (!GetConsoleScreenBufferInfoEx(orig_con_h, &orig_con_info)) {
MessageBox(NULL, "GetConsoleScreenBufferInfoEx", "Error", 0);
return 1;
}
//
// Check if we're able to create a console that fits
// our desired size:
//
if (NEW_WIDTH > orig_con_info.dwMaximumWindowSize.X ||
NEW_HEIGHT > orig_con_info.dwMaximumWindowSize.Y) {
MessageBox(NULL, "Requested width or height too large", "Error", 0);
goto back_to_orig_console;
}
repl_con_h = CreateConsoleScreenBuffer (GENERIC_READ | GENERIC_WRITE, 0, NULL, CONSOLE_TEXTMODE_BUFFER, NULL);
if (repl_con_h == INVALID_HANDLE_VALUE) {
error("CreateConsoleScreenBuffer");
goto back_to_orig_console;
}
//
// Switch to the »new« console
//
SetConsoleActiveScreenBuffer(repl_con_h);
//
// Change the new console's size
//
repl_con_screen.Left = 0;
repl_con_screen.Top = 0;
repl_con_screen.Right = NEW_WIDTH -1;
repl_con_screen.Bottom = NEW_HEIGHT -1;
if (!SetConsoleWindowInfo(repl_con_h, TRUE, &repl_con_screen)) {
error("SetConsoleWindowInfo");
goto back_to_orig_console;
}
//
// Change the new console's buffer size.
//
repl_con_buf_size.X = NEW_WIDTH ;
repl_con_buf_size.Y = NEW_HEIGHT;
if (!SetConsoleScreenBufferSize(repl_con_h, repl_con_buf_size)) {
error("SetConsoleScreenBufferSize");
goto back_to_orig_console;
}
//
// Show rudimentary coordinate system
//
for (cursor_pos.X = 10; cursor_pos.X < NEW_WIDTH ; cursor_pos.X += 10) {
for (cursor_pos.Y = 0; cursor_pos.Y < NEW_HEIGHT; cursor_pos.Y ++ ) {
if (!SetConsoleCursorPosition(repl_con_h, cursor_pos)) {
error("SetConsoleCursorPosition");
goto back_to_orig_console;
}
WriteConsole(repl_con_h, &"0123456789"[cursor_pos.Y %10], 1, NULL, NULL);
}}
for (cursor_pos.Y = 10; cursor_pos.Y < NEW_HEIGHT; cursor_pos.Y += 10) {
for (cursor_pos.X = 0; cursor_pos.X < NEW_WIDTH ; cursor_pos.X ++ ) {
if (!SetConsoleCursorPosition(repl_con_h, cursor_pos)) {
error("SetConsoleCursorPosition");
goto back_to_orig_console;
}
WriteConsole(repl_con_h, &"0123456789"[cursor_pos.X %10], 1, NULL, NULL);
}}
//
// Wait until the user chooses to quit the app.
//
MessageBoxA(0, "Finish app", "resize", MB_OK);
//
// Go back to original console
//
back_to_orig_console:
SetConsoleScreenBufferInfoEx(orig_con_h, &orig_con_info);
SetConsoleActiveScreenBuffer(orig_con_h);
return 0;
};