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求教 如何精准地测量字符串宽高

-1

大佬们 我用gdi+的Drawstring()函数绘制了一个字符串 有没有方法能够准确测量出它的宽高啊

用了EasyX的textwidth() wingdi的GetTextExtentPoint32() gdi+的MeasureString()都不能准确测量(

以下是我写的用于测量字符串宽高的函数 希望大佬改正函数中的错误 谢谢!

UINT GetTextWidth(LOGFONT& font,	//要测量的字符串的字体
 const wchar_t* text				//要测量的字符串
) {
		IMAGE* buffer = GetWorkingImage();
		IMAGE image;
		SetWorkingImage(&image);
		settextstyle(&font);
		SetWorkingImage(buffer);
		SizeF layout(FLT_MAX, FLT_MAX);
		Font f(GetImageHDC(&image));
		Graphics g(GetImageHDC(&image));
		SizeF ret;
		g.MeasureString(text, -1, &f, layout, NULL, &ret);	//这函数测不准qaq
		return ret.Width;	//返回字符串的宽度(这个函数我打算只让它测宽度)
}
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2

测试不管是 textwidth textheight  还是 gdi 都能够准确获取宽高

根据宽高绘制矩形,恰好能够包裹文字,已经说明够准确了吧

#include <windows.h>
#include <tchar.h>

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

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrecInstance, PSTR szCmdLine, int iCmdShow)
{
	static TCHAR szAppName[] = TEXT("HelloWin");
	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("This program requires Windows NT!"), szAppName, MB_ICONERROR);
		return 0;
	}

	hwnd = CreateWindow(szAppName, TEXT("The hello program"), WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT,
		CW_USEDEFAULT,
		600,
		300, 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;

	switch (message)
	{
		case WM_PAINT:
		{
			RECT rc = {100, 100, 300, 200};
			hdc = BeginPaint(hwnd, &ps);
			GetClientRect(hwnd, &rect);
			DrawText(hdc, TEXT("Hello, Windows 98"), -1, &rc, DT_SINGLELINE);

			SIZE size;
			GetTextExtentPoint32(hdc, TEXT("Hello, Windows 98"), _tcslen(TEXT("Hello, Windows 98")), &size);

			HBRUSH brush = CreateSolidBrush(RGB(193, 15, 213));
			HBRUSH old = (HBRUSH)SelectObject(hdc, brush);

			RECT rec;
			SetRect(&rec, 100, 100, 100 + size.cx, 100 + size.cy);// 根据宽高绘制矩形包裹文字
			HBRUSH brush2 = (HBRUSH)GetStockObject(GRAY_BRUSH);
			FrameRect(hdc, &rec, brush2);
			SelectObject(hdc, old);
			EndPaint(hwnd, &ps);
			return 0;
		}
		case WM_DESTROY:
			PostQuitMessage(0);
			return 0;
	}
	return DefWindowProc(hwnd, message, wParam, lParam);
}
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2024-4-7

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