【Windows程序设计】不要猜测文本的尺寸

最新推荐文章于 2021-09-24 10:34:34 发布

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最新推荐文章于 2021-09-24 10:34:34 发布

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分类专栏： Windows程序设计

本文链接：https://blog.youkuaiyun.com/a851248662/article/details/79326484

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本文提供了一个简单的 Windows NT 程序实例，演示了如何创建窗口、响应消息循环及绘制文本等内容。该程序使用了 Windows API 进行开发，并通过消息循环实现了窗口的显示、更新和关闭等功能。

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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 szCmdLine,int iCmdShow)
{
	static TCHAR szAppName[] = TEXT("MyWindows");
	HWND hwnd;
	MSG msg;
	WNDCLASS wndclass;

	wndclass.style = CS_HREDRAW | CS_VREDRAW;
	wndclass.lpfnWndProc = WndProc;
	wndclass.cbClsExtra = 0;
	wndclass.cbWndExtra = 0;
	wndclass.hInstance = hInstance;
	wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
	wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wndclass.lpszMenuName = NULL;
	wndclass.lpszClassName = szAppName;

	if (!RegisterClass(&wndclass))
	{
		MessageBox(NULL, TEXT("这个程序需要在 Windows NT 才能运行"), szAppName, MB_ICONERROR);
		return 0;
	}

	hwnd = CreateWindow(szAppName,
		TEXT("By.龙猫"),
		WS_OVERLAPPEDWINDOW,
		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;
		cyChar = tm.tmHeight + tm.tmExternalLeading;
		ReleaseDC(hwnd, hdc);

	case WM_PAINT:
		hdc = BeginPaint(hwnd, &ps);

		//GetClientRect(hwnd, &rect);

		//DrawText(hdc, TEXT("Hello windows NT"), -1, &rect,
		//	DT_SINGLELINE | DT_CENTER | DT_VCENTER);

		//TextOut(hdc, 400, 300, TEXT("hello"), 5);
		GetTextMetrics(hdc, &tm);
		for (i = 0; i < 10; i++)
		{
			StringCchPrintf(szBuffer, 128, TEXT("%d:%s"), i + 1, TEXT("hello world !"));
			//wsprintf(szBuffer, TEXT("%d:%s"), i + 1, TEXT("hello world !"));
			StringCchLength(szBuffer, 128, &iTarget);
			TextOut(hdc, cxChar, cyChar*i, szBuffer, iTarget);
		}

		EndPaint(hwnd, &ps);
		return 0;

	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;

	case WM_LBUTTONDOWN:
		//MessageBox(hwnd, TEXT("按下"), TEXT("提醒"),MB_OK);
		return 0;

	case WM_CLOSE:
		if (MessageBox(hwnd, TEXT("请问是否真的要关闭我"), TEXT("提示"), MB_YESNO) == IDYES)
		{
			DestroyWindow(hwnd);
		}
		else
		{
			return 0;
		}
	}
	return DefWindowProc(hwnd, message, wParam, lParam);
}