'NumberOfCharsWritten' could be '0': this does not adhere to the specification f-CodePudding

Im trying to write a console screen buffer, but i keep getting different errors pointing at the LPDWORD variable no matter what values i assign to it

#include<iostream>
#include<Windows.h>

using namespace std;

int main()
{
    COORD cell{0, 0};
    LPDWORD NumberOfCharsWritten = 0;
    wchar_t* screen = new wchar_t[80 * 30];
    HANDLE hConsole = CreateConsoleScreenBuffer(GENERIC_READ, FILE_SHARE_WRITE, NULL, CONSOLE_TEXTMODE_BUFFER, NULL);
    SetConsoleActiveScreenBuffer(hConsole);
    DWORD dwBytesWriten = 0;

    while (true)
    {
        screen[10 * 80   15] = L'P';

        WriteConsoleOutputCharacter(hConsole, screen, 80 * 30, cell, NumberOfCharsWritten);
    }
}

CodePudding user response：

You are passing a NULL pointer to WriteConsoleOutputCharacter(), but the pointer needs to point to an actual DWORD instead.

Declare a DWORD variable and use the & operator to get a pointer to that DWORD:

DWORD NumberOfCharsWritten = 0;
...
WriteConsoleOutputCharacter(..., &NumberOfCharsWritten);