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131 lines
3.5 KiB
C
131 lines
3.5 KiB
C
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// ------------------------------------------------------------------
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// Windows 2000 Graphics API Black Book
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// Chapter 1 - Listing 1.1 (WM_PAINT Demo)
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//
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// Created by Damon Chandler <dmc27@ee.cornell.edu>
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// Updates can be downloaded at: <www.coriolis.com>
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//
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// Please do not hesistate to e-mail me at dmc27@ee.cornell.edu
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// if you have any questions about this code.
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// ------------------------------------------------------------------
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//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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#include <windows.h>
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#include <string.h>
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//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
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const char* WndClassName = "GMainWnd";
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LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
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LPARAM LParam);
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int APIENTRY WinMain(HINSTANCE HInstance, HINSTANCE HPrevInstance,
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LPTSTR lpCmdLine, int nCmdShow)
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{
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MSG msg;
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WNDCLASS wc;
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memset(&wc, 0, sizeof(WNDCLASS));
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wc.style = CS_VREDRAW | CS_HREDRAW | CS_DBLCLKS;
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wc.lpfnWndProc = MainWndProc;
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wc.hInstance = HInstance;
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wc.hCursor = LoadCursor(NULL, (LPCTSTR)IDC_ARROW);
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wc.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);
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wc.lpszClassName = WndClassName;
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if (RegisterClass(&wc))
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{
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HWND HWnd =
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CreateWindow(WndClassName, TEXT("WM_PAINT Demo"),
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WS_OVERLAPPEDWINDOW | WS_CAPTION | WS_VISIBLE,
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CW_USEDEFAULT, CW_USEDEFAULT, 200, 150,
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NULL, NULL, HInstance, NULL);
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if (HWnd)
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{
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ShowWindow(HWnd, nCmdShow);
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UpdateWindow(HWnd);
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while (GetMessage(&msg, NULL, 0, 0))
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{
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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}
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}
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}
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return 0;
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}
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//------------------------------------------------------------------
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LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
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LPARAM LParam)
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{
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const char* text = "Persistent Text";
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switch (Msg)
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{
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case WM_PAINT:
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{
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// determine the invalidated area of the window
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RECT RUpdate;
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HDC Hdc;
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GetUpdateRect(HWnd, &RUpdate, FALSE);
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// grab a handle to our window's
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// common display device context
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Hdc = GetDC(HWnd);
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#if 0
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try
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#endif
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{
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RECT RClient;
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GetClientRect(HWnd, &RClient);
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// set the clipping region
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IntersectClipRect(Hdc, RUpdate.left, RUpdate.top,
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RUpdate.right, RUpdate.bottom);
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// fill the client area with the background brush
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/*HBRUSH HBrush =
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reinterpret_cast<HBRUSH>
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(HBRUSH)(GetClassLong(HWnd, GCL_HBRBACKGROUND)
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);*/
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FillRect(Hdc, &RClient, NULL);
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// render the persistent text
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SetTextColor(Hdc, PALETTERGB(0, 0, 255));
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DrawText(Hdc, text, strlen(text), &RClient,
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DT_CENTER | DT_VCENTER | DT_SINGLELINE);
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}
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#if 0
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catch (...)
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#endif
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{
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// release the device context
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ReleaseDC(HWnd, Hdc);
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// validate the update area
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ValidateRect(HWnd, &RUpdate);
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}
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// release the device context
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ReleaseDC(HWnd, Hdc);
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// validate the update area
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ValidateRect(HWnd, &RUpdate);
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break;
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}
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case WM_DESTROY:
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{
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PostQuitMessage(0);
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return 0;
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}
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}
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return DefWindowProc(HWnd, Msg, WParam, LParam);
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}
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//------------------------------------------------------------------
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