WHATSIZE程式

基本介紹

• 中文名：WHATSIZE程式
• 外文名：Windows
• 具體程式：程式5-6  WHATSIZEWHATSIZE.C
• 評價：這個程式看似麻煩其實原理很簡單

簡介

Windows的小歷史：第一篇如何寫作Windows程式的介紹文章出現在《Microsoft Systems Journal》1986年12月號上。在那篇文章中，範例程式叫做WSZ（「what size：什麼尺寸」），它以圖素、英寸和毫米為單位顯示了顯示區域的大小。那個程式的更簡易版本是WHATSIZE，如程式5-6所示。程式顯示了以五種度量映射方式顯示的視窗顯示區域的大小。

具體程式

程式5-6 WHATSIZE

WHATSIZE.C

/*------------------------------------------------------------

WHATSIZE.C -- What Size is the Window?

(c) Charles Petzold, 1998

----------------------------------------------------------*/

#include <windows.h>

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

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,

PSTR szCmdLine, int iCmdShow)

{

static TCHAR szAppName[] = TEXT ("WhatSize") ;

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 ("What Size is the Window?"),

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 ;

}

void Show (HWND hwnd, HDC hdc, int xText, int yText, int iMapMode,

TCHAR * szMapMode)

{

TCHAR szBuffer [60] ;

RECT rect ;

SaveDC (hdc) ;

SetMapMode (hdc, iMapMode) ;

GetClientRect (hwnd, &rect) ;

DPtoLP (hdc, (PPOINT) &rect, 2) ;

RestoreDC (hdc, -1) ;

TextOut ( hdc, xText, yText, szBuffer,

wsprintf (szBuffer, TEXT ("%-20s %7d %7d %7d %7d"), szMapMode,

rect.left, rect.right, rect.top, rect.bottom)) ;

}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)

{

static TCHAR szHeading [] =

TEXT ("Mapping Mode Left Right Top Bottom") ;

static TCHAR szUndLine [] =

TEXT ("------------ ---- -------- ------") ;

static int cxChar, cyChar ;

HDC hdc ;

PAINTSTRUCT ps ;

TEXTMETRIC tm ;

switch (message)

{

case WM_CREATE:

hdc = GetDC (hwnd) ;

SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ;

GetTextMetrics (hdc, &tm) ;

cxChar = tm.tmAveCharWidth ;

cyChar = tm.tmHeight + tm.tmExternalLeading ;

ReleaseDC (hwnd, hdc) ;

return 0 ;

case WM_PAINT:

hdc = BeginPaint (hwnd, &ps) ;

SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ;

SetMapMode (hdc, MM_ANISOTROPIC) ;

SetWindowExtEx (hdc, 1, 1, NULL) ;

SetViewportExtEx (hdc, cxChar, cyChar, NULL) ;

TextOut (hdc, 1, 1, szHeading, lstrlen (szHeading)) ;

TextOut (hdc, 1, 2, szUndLine, lstrlen (szUndLine)) ;

Show (hwnd, hdc, 1, 3, MM_TEXT, TEXT ("TEXT (pixels)")) ;

Show (hwnd, hdc, 1, 4, MM_LOMETRIC, TEXT ("LOMETRIC (.1 mm)")) ;

Show (hwnd, hdc, 1, 5, MM_HIMETRIC, TEXT ("HIMETRIC (.01 mm)")) ;

Show (hwnd, hdc, 1, 6, MM_LOENGLISH, TEXT ("LOENGLISH (.01 in)")) ;

Show (hwnd, hdc, 1, 7, MM_HIENGLISH,TEXT ("HIENGLISH (.001 in)")) ;

Show (hwnd, hdc, 1, 8, MM_TWIPS, EXT ("TWIPS (1/1440 in)")) ;

EndPaint (hwnd, &ps) ;

return 0 ;

case WM_DESTROY:

PostQuitMessage (0) ;

return 0 ;

}

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

}

評價

這個程式看似麻煩其實原理很簡單