c++ windows.h memory increse - c++

Question

hellow for some reson when i move mouse in window made in
windows.h allocated memory increse, pls help,
and also when mouse is moving screen blink
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code:
#include <Windows.h>
#include <windowsx.h>
#include <iostream>
#include <WinUser.h>
void DrawTirangle(HWND hwnd, POINT vertices[], int r, int g, int b) {
HDC hdc = GetDC(hwnd);
HPEN hPen = CreatePen(PS_SOLID, 2, RGB(r, g, b));
HPEN hOldPen = SelectPen(hdc, hPen);
HBRUSH hBrush = CreateSolidBrush(RGB(r, g, b));
HBRUSH hOldBrush = SelectBrush(hdc, hBrush);
POINT verticesx[] = { {vertices[0].x, vertices[0].y}, {vertices[1].x, vertices[1].y}, {vertices[2].x, vertices[2].y} };
Polygon(hdc, verticesx, sizeof(verticesx) / sizeof(verticesx[0]));
SelectBrush(hdc, hOldBrush);
DeleteObject(hBrush);
SelectPen(hdc, hOldPen);
DeleteObject(hPen);
}
#include "sys.h"
LRESULT CALLBACK ScreenProc(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam) {
switch (uMsg)
{
case WM_CLOSE:
DestroyWindow(hWnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
HDC hDC = GetDC(hWnd);
RECT rect;
GetWindowRect(hWnd, &rect);
PatBlt(hDC, 0, 0, rect.right, rect.bottom, BLACKNESS);
ReleaseDC(hWnd, hDC);
renderer(hWnd);
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
void ClearBuffer(HWND hwnd, RECT screenDef) {
HDC hdc = GetDC(hwnd);
HPEN hPen = CreatePen(PS_SOLID, 2, RGB(0, 0, 0));
HPEN hOldPen = SelectPen(hdc, hPen);
HBRUSH hBrush = CreateSolidBrush(RGB(0, 0, 0));
HBRUSH hOldBrush = SelectBrush(hdc, hBrush);
POINT vertices1[] = { {0, 0}, {0, screenDef.bottom}, {screenDef.right + 80, screenDef.bottom},{screenDef.right,0} };
Polygon(hdc, vertices1, sizeof(vertices1) / sizeof(vertices1[0]));
SelectBrush(hdc, hOldBrush);
DeleteObject(hBrush);
SelectPen(hdc, hOldPen);
DeleteObject(hPen);
}
class SCREEN {
public:
SCREEN()
: m_hInstance(GetModuleHandle(nullptr))
{
const wchar_t* CLASS_NAME = L"x64 PxOS";
WNDCLASS wndClass = {};
wndClass.lpszClassName = CLASS_NAME;
wndClass.hInstance = m_hInstance;
wndClass.hIcon = LoadIcon(NULL, IDI_WINLOGO);
wndClass.hCursor = LoadCursor(NULL,IDC_ARROW);
wndClass.lpfnWndProc = ScreenProc;
RegisterClass(&wndClass);
DWORD style = WS_CAPTION | WS_MINIMIZEBOX | WS_SYSMENU;
int w = 640;
int h = 480;
RECT rect;
rect.left = 250;
rect.top = 250;
rect.right = rect.left + w;
rect.bottom = rect.top + h;
screenDef.left = rect.left;
screenDef.top = rect.top;
screenDef.right = rect.right;
screenDef.bottom = rect.bottom;
AdjustWindowRect(&rect, style, false);
mainBuffer = CreateWindowEx(
0,
CLASS_NAME,
L"x64 PxOS",
style,
rect.left,
rect.top,
rect.right - rect.left,
rect.bottom - rect.top,
NULL,
NULL,
m_hInstance,
NULL
);
ShowWindow(mainBuffer, SW_SHOW);
OldBuffer = mainBuffer;
OldBuffer1 = mainBuffer;
ClearBufferI = mainBuffer;
ClearBuffer(ClearBufferI, screenDef);
screenDefI = screenDef;
}
SCREEN(const SCREEN&) = delete;
SCREEN& operator = (const SCREEN&) = delete;
~SCREEN() {
const wchar_t* CLASS_NAME = L"x64 PxOS";
UnregisterClass(CLASS_NAME,m_hInstance);
}
bool ProcessMessages() {
MSG msg = {};
while (PeekMessage(&msg,nullptr,0u,0u,PM_REMOVE))
{
if (msg.message == WM_QUIT) {
return false;
}
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return true;
}
HINSTANCE m_hInstance;
void SwapBuffers() {
/*if (bs == 1) {
bs = 2;
mainBuffer = OldBuffer;
}
else if(bs == 2) {
bs = 1;
mainBuffer = OldBuffer1;
}*/
}
HWND mainBuffer;
HWND OldBuffer;
HWND OldBuffer1;
HWND ClearBufferI;
int bs = 1;
RECT screenDef;
RECT screenDefI;
};

Answer 1

You are missing ReleaseDC for every GetDC.
You should only paint your window in response to WM_PAINT by calling BeginPaint/EndPaint.