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);
}
