I use the function "FillConsoleOutputCharacter" but the application stoped working - c++

Question

I want to make a console application, so i searched for Windows API, and get this code, but it stoped working when i run it, what should i do?
Source code:
#include "windows.h"
#include "stdio.h"
#include <conio.h> //console i/o
int main()
{
HANDLE hOut;
// 获取标准输出设备句柄
hOut = GetStdHandle(STD_OUTPUT_HANDLE);
// 窗口信息
CONSOLE_SCREEN_BUFFER_INFO bInfo;
// 获取窗口信息
GetConsoleScreenBufferInfo(hOut, &bInfo );
printf("\n\nThe soul selects her own society,\n");
printf("Then shuts the door;\n");
printf("On her devine majority\n");
printf("Obtrude no more.\n\n");
_getch();
COORD pos = {0, 0};
// 向窗口中填充字符以获得清屏的效果
FillConsoleOutputCharacter(hOut, ' ', bInfo.dwSize.X * bInfo.dwSize.Y, pos, NULL);
// 关闭标准输出设备句柄
CloseHandle(hOut);
return 0;
}
Could someone tell me how to solve? PLZPLZ!!

Answer 1

You are passing NULL to the lpNumberOfCharsWritten parameter of FillConsoleOutputCharacter(), but the documentation says:
lpNumberOfCharsWritten [out]
A pointer to a variable that receives the number of characters actually written to the console screen buffer.
It does not say that NULL is valid for that parameter. So give it what it wants - a pointer to a variable, eg:
DWORD dwNumWritten;
FillConsoleOutputCharacter(hOut, ' ', bInfo.dwSize.X * bInfo.dwSize.Y, pos, &dwNumWritten);