分析：在WM_CREATE消息中获取字母宽度与高度修改后存入变量，在WM_PAINT消息中打印时直接在TextOut函数里面使用变量进行设置

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#include <windows.h>
#include <strsafe.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR CmdLine, int iCmdShow)
{
	static TCHAR szAppName[] = TEXT("MyWindows");	// 注意使用TEXT包裹语句
	HWND hwnd;	// 窗口句柄
	MSG msg;	// 消息结构
	WNDCLASS wndclass;	// 窗口类, 定义窗口基本属性
	wndclass.style = CS_HREDRAW | CS_VREDRAW;	// CS->ClassStyle, H->horizontal 水平的, V->vertical 垂直的, redraw 重绘
	wndclass.lpfnWndProc = WndProc;				// 指定窗口过程(回调函数)
	wndclass.cbClsExtra = 0;
	wndclass.cbWndExtra = 0;					// 预留的额外空间, 一般设为0
	wndclass.hInstance = hInstance;
	wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);	// 设定图标
	wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);		// 设定光标
	wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);	// 窗口背景色
	wndclass.lpszMenuName = NULL;		// 菜单名字
	wndclass.lpszClassName = szAppName;	// 窗口类名

	if (!RegisterClass(&wndclass))	// 注册窗口, 注册成功返回ATOM类型(对应了字符串在ATOM表的位置); 注册失败返回0
	{
		MessageBox(NULL, TEXT("这个程序需要在Windows NT才能执行!"), szAppName, MB_ICONERROR);
	}

	hwnd = CreateWindow(szAppName,
		TEXT("快乐小凳凳"),
		WS_OVERLAPPEDWINDOW,	// 窗口风格
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		NULL,
		NULL,
		hInstance,
		NULL
	);

	ShowWindow(hwnd, iCmdShow);
	UpdateWindow(hwnd);

	while (GetMessage(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	HDC hdc;
	PAINTSTRUCT ps;
	RECT rect;
	TCHAR szBuffer[128];
	int i;
	size_t iTarget;
	TEXTMETRIC tm;
	static int cxChar, cyChar;

	switch (message)
	{
	case WM_CREATE:
		hdc = GetDC(hwnd);
		GetTextMetrics(hdc, &tm);
		cxChar = tm.tmAveCharWidth;	// 平均宽度(大写字母一般取平均宽度的1.5倍)
		cyChar = tm.tmHeight + tm.tmExternalLeading;
		ReleaseDC(hwnd, hdc);
		return 0;
	case WM_PAINT:
		hdc = BeginPaint(hwnd, &ps);
		for (i = 0; i < 10; i++)
		{
			StringCchPrintf(szBuffer, 128, TEXT("%d: %s"), i + 1, TEXT("I love WY!"));
			StringCchLength(szBuffer, 128, &iTarget);
			TextOut(hdc, cxChar, i * cyChar, szBuffer, iTarget);
		}
		EndPaint(hwnd, &ps);
		return 0;
	case WM_DESTROY:
		PostQuitMessage(0); // 正式关闭窗口
		return 0;
	}

	return DefWindowProc(hwnd, message, wParam, lParam);
}