GetTextExtent 函数测试代码 - 测量文本尺寸

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

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

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName[] = TEXT("GetTextExtentTest"); 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("GetTextExtent Test"),
    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) { static TCHAR szText[] = TEXT("GetTextExtent Test"); static int cxChar, cyChar; static SIZE sizeText; HDC hdc; PAINTSTRUCT ps;

switch (message)
{
case WM_CREATE:
    hdc = GetDC(hwnd);
    SelectObject(hdc, GetStockObject(SYSTEM_FONT));
    GetTextExtentPoint32(hdc, szText, lstrlen(szText), &sizeText);
    cxChar = sizeText.cx / lstrlen(szText);
    cyChar = sizeText.cy;
    ReleaseDC(hwnd, hdc);
    return 0;

case WM_PAINT:
    hdc = BeginPaint(hwnd, &ps);
    TextOut(hdc, 0, 0, szText, lstrlen(szText));
    EndPaint(hwnd, &ps);
    return 0;

case WM_DESTROY:
    PostQuitMessage(0);
    return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);

}