74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
|
/*
|
||
|
|
* Demonstrates that console clearing sets each cell's character to SP, not
|
||
|
|
* NUL, and it sets the attribute of each cell to the current text attribute.
|
||
|
|
*
|
||
|
|
* This confirms the MSDN instruction in the "Clearing the Screen" article.
|
||
|
|
* https://msdn.microsoft.com/en-us/library/windows/desktop/ms682022(v=vs.85).aspx
|
||
|
|
* It advises using GetConsoleScreenBufferInfo to get the current text
|
||
|
|
* attribute, then FillConsoleOutputCharacter and FillConsoleOutputAttribute to
|
||
|
|
* write to the console buffer.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <windows.h>
|
||
|
|
|
||
|
|
#include <cassert>
|
||
|
|
#include <cstdio>
|
||
|
|
#include <cstdlib>
|
||
|
|
|
||
|
|
#include "../shared/DebugClient.cc"
|
||
|
|
#include "TestUtil.cc"
|
||
|
|
|
||
|
|
int main(int argc, char *argv[]) {
|
||
|
|
if (argc == 1) {
|
||
|
|
startChildProcess(L"CHILD");
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
const HANDLE conout = GetStdHandle(STD_OUTPUT_HANDLE);
|
||
|
|
|
||
|
|
SetConsoleTextAttribute(conout, 0x24);
|
||
|
|
system("cls");
|
||
|
|
|
||
|
|
setWindowPos(0, 0, 1, 1);
|
||
|
|
setBufferSize(80, 25);
|
||
|
|
setWindowPos(0, 0, 80, 25);
|
||
|
|
|
||
|
|
CHAR_INFO buf;
|
||
|
|
COORD bufSize = { 1, 1 };
|
||
|
|
COORD bufCoord = { 0, 0 };
|
||
|
|
SMALL_RECT rect = { 5, 5, 5, 5 };
|
||
|
|
BOOL ret;
|
||
|
|
DWORD actual;
|
||
|
|
COORD writeCoord = { 5, 5 };
|
||
|
|
|
||
|
|
// After cls, each cell's character is a space, and its attributes are the
|
||
|
|
// default text attributes.
|
||
|
|
ret = ReadConsoleOutputW(conout, &buf, bufSize, bufCoord, &rect);
|
||
|
|
assert(ret && buf.Char.UnicodeChar == L' ' && buf.Attributes == 0x24);
|
||
|
|
|
||
|
|
// Nevertheless, it is possible to change a cell to NUL.
|
||
|
|
ret = FillConsoleOutputCharacterW(conout, L'\0', 1, writeCoord, &actual);
|
||
|
|
assert(ret && actual == 1);
|
||
|
|
ret = ReadConsoleOutputW(conout, &buf, bufSize, bufCoord, &rect);
|
||
|
|
assert(ret && buf.Char.UnicodeChar == L'\0' && buf.Attributes == 0x24);
|
||
|
|
|
||
|
|
// As well as a 0 attribute. (As one would expect, the cell is
|
||
|
|
// black-on-black.)
|
||
|
|
ret = FillConsoleOutputAttribute(conout, 0, 1, writeCoord, &actual);
|
||
|
|
assert(ret && actual == 1);
|
||
|
|
ret = ReadConsoleOutputW(conout, &buf, bufSize, bufCoord, &rect);
|
||
|
|
assert(ret && buf.Char.UnicodeChar == L'\0' && buf.Attributes == 0);
|
||
|
|
ret = FillConsoleOutputCharacterW(conout, L'X', 1, writeCoord, &actual);
|
||
|
|
assert(ret && actual == 1);
|
||
|
|
ret = ReadConsoleOutputW(conout, &buf, bufSize, bufCoord, &rect);
|
||
|
|
assert(ret && buf.Char.UnicodeChar == L'X' && buf.Attributes == 0);
|
||
|
|
|
||
|
|
// The 'X' is invisible.
|
||
|
|
countDown(3);
|
||
|
|
|
||
|
|
ret = FillConsoleOutputAttribute(conout, 0x42, 1, writeCoord, &actual);
|
||
|
|
assert(ret && actual == 1);
|
||
|
|
|
||
|
|
countDown(5);
|
||
|
|
}
|