9WinMap 映射

#include <windows.h>
#include <iostream>

CHAR szText[256] = { 0 };

#define PrintLog(x) WriteConsole(g_hStdout, x, strlen(x), NULL, NULL)

HINSTANCE g_hInst = NULL; //窗口句柄
HANDLE g_hStdout = NULL; //控制台句柄

//OnPaint
void OnPaint(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam)
{
	PAINTSTRUCT ps = { 0 };
	HDC hDC = BeginPaint(hWnd, &ps);

	Rectangle(hDC, 100, 100, 200, 200); //默认情况下是100个逻辑单位

	int nOldMap = SetMapMode(hDC, MM_LOMETRIC);//0.1MM   X方向向右，Y方向向上
	Rectangle(hDC, 100, -100, 200, -200); //默认情况下是100个逻辑单位
	SetMapMode(hDC, nOldMap);//恢复旧的映射模式

	nOldMap = SetMapMode(hDC, MM_HIMETRIC);
	Rectangle(hDC, 100, -100, 200, -200); //默认情况下是100个逻辑单位
	SetMapMode(hDC, nOldMap);

	nOldMap = SetMapMode(hDC, MM_ISOTROPIC);
	SetViewportExtEx(hDC, 2, 2, NULL); //屏幕单位
	SetWindowExtEx(hDC, 4, 4, NULL); //逻辑单位
	SetWindowOrgEx(hDC, 100, 100, NULL); //X和Y偏移100
	Rectangle(hDC, 100, 100, 200, 200); //默认情况下是100个逻辑单位
	SetMapMode(hDC, nOldMap);




	EndPaint(hWnd, &ps);
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam)
{
	switch (nMsg)
	{
	case WM_PAINT:
		OnPaint(hWnd, nMsg, wParam, lParam);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	}
	return DefWindowProc(hWnd, nMsg, wParam, lParam);
}

BOOL RegisterWnd(LPSTR pszClassName)
{
	WNDCLASSEX wce = { 0 };
	wce.cbSize = sizeof(wce);
	wce.cbClsExtra = 0;
	wce.cbWndExtra = 0;
	wce.hbrBackground = HBRUSH(COLOR_BTNFACE + 1);
	wce.hCursor = NULL;
	wce.hIcon = NULL;
	wce.hIconSm = NULL;
	wce.hInstance = g_hInst;
	wce.lpfnWndProc = WndProc;
	wce.lpszClassName = pszClassName;
	wce.lpszMenuName = NULL;
	wce.style = CS_HREDRAW | CS_VREDRAW;

	ATOM atom = RegisterClassEx(&wce);
	if (atom == NULL)
	{
		return FALSE;
	}
	else
	{
		return TRUE;
	}
}

HWND CreateWnd(LPSTR pszClassName)
{
	HWND hWnd = CreateWindowEx(0, pszClassName, "灭天", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
		CW_USEDEFAULT, NULL, NULL, g_hInst, 0);

	return hWnd;
}

void ShowWnd(HWND hWnd)
{
	ShowWindow(hWnd, SW_SHOW);
	UpdateWindow(hWnd);
}

void Msg()
{
	MSG msg = { 0 };
	while (GetMessage(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
}

void ConsoleWnd()
{
	AllocConsole();
	g_hStdout = GetStdHandle(STD_OUTPUT_HANDLE);

	CHAR szText[] = "Debug start:\n";
	WriteConsole(g_hStdout, szText, strlen(szText), NULL, NULL);
}
int WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPSTR lpCmdLine, _In_ int nShowCmd)
{
	g_hInst = hInstance;
	//ConsoleWnd();
	RegisterWnd("oooo");
	HWND hWnd = CreateWnd("oooo");
	ShowWnd(hWnd);
	Msg();
	return 0;
}

来自为知笔记(Wiz)