163 lines
4.3 KiB
C
163 lines
4.3 KiB
C
//+---------------------------------------------------------------------------
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//
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// HELLO_WIN.C - Windows GUI 'Hello World!' Example
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//
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//+---------------------------------------------------------------------------
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#include <windows.h>
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#define APPNAME "HELLO_WIN"
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char szAppName[] = APPNAME; // The name of this application
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char szTitle[] = APPNAME; // The title bar text
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const char *pWindowText;
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void CenterWindow(HWND hWnd);
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//+---------------------------------------------------------------------------
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//
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// Function: WndProc
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//
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// Synopsis: very unusual type of function - gets called by system to
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// process windows messages.
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//
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// Arguments: same as always.
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//----------------------------------------------------------------------------
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LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
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{
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switch (message) {
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// ----------------------- first and last
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case WM_CREATE:
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CenterWindow(hwnd);
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break;
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case WM_DESTROY:
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PostQuitMessage(0);
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break;
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// ----------------------- get out of it...
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case WM_RBUTTONUP:
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DestroyWindow(hwnd);
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break;
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case WM_KEYDOWN:
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if (VK_ESCAPE == wParam)
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DestroyWindow(hwnd);
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break;
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// ----------------------- display our minimal info
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case WM_PAINT:
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{
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PAINTSTRUCT ps;
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HDC hdc;
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RECT rc;
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hdc = BeginPaint(hwnd, &ps);
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GetClientRect(hwnd, &rc);
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SetTextColor(hdc, RGB(240,240,96));
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SetBkMode(hdc, TRANSPARENT);
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DrawText(hdc, pWindowText, -1, &rc, DT_CENTER|DT_SINGLELINE|DT_VCENTER);
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EndPaint(hwnd, &ps);
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break;
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}
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// ----------------------- let windows do all other stuff
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default:
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return DefWindowProc(hwnd, message, wParam, lParam);
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}
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return 0;
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}
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//+---------------------------------------------------------------------------
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//
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// Function: WinMain
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//
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// Synopsis: standard entrypoint for GUI Win32 apps
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//
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//----------------------------------------------------------------------------
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int APIENTRY WinMain(
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HINSTANCE hInstance,
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HINSTANCE hPrevInstance,
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LPSTR lpCmdLine,
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int nCmdShow
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)
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{
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MSG msg;
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WNDCLASS wc;
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HWND hwnd;
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pWindowText = lpCmdLine[0] ? lpCmdLine : "Hello Windows!";
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// Fill in window class structure with parameters that describe
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// the main window.
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ZeroMemory(&wc, sizeof wc);
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wc.hInstance = hInstance;
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wc.lpszClassName = szAppName;
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wc.lpfnWndProc = (WNDPROC)WndProc;
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wc.style = CS_DBLCLKS|CS_VREDRAW|CS_HREDRAW;
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wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
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wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
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wc.hCursor = LoadCursor(NULL, IDC_ARROW);
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if (FALSE == RegisterClass(&wc))
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return 0;
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// create the browser
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hwnd = CreateWindow(
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szAppName,
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szTitle,
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WS_OVERLAPPEDWINDOW|WS_VISIBLE,
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CW_USEDEFAULT,
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CW_USEDEFAULT,
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360,//CW_USEDEFAULT,
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240,//CW_USEDEFAULT,
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0,
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0,
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hInstance,
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0);
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if (NULL == hwnd)
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return 0;
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// Main message loop:
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while (GetMessage(&msg, NULL, 0, 0) > 0) {
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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}
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return msg.wParam;
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}
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//+---------------------------------------------------------------------------
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//+---------------------------------------------------------------------------
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void CenterWindow(HWND hwnd_self)
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{
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HWND hwnd_parent;
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RECT rw_self, rc_parent, rw_parent;
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int xpos, ypos;
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hwnd_parent = GetParent(hwnd_self);
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if (NULL == hwnd_parent)
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hwnd_parent = GetDesktopWindow();
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GetWindowRect(hwnd_parent, &rw_parent);
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GetClientRect(hwnd_parent, &rc_parent);
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GetWindowRect(hwnd_self, &rw_self);
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xpos = rw_parent.left + (rc_parent.right + rw_self.left - rw_self.right) / 2;
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ypos = rw_parent.top + (rc_parent.bottom + rw_self.top - rw_self.bottom) / 2;
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SetWindowPos(
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hwnd_self, NULL,
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xpos, ypos, 0, 0,
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SWP_NOSIZE|SWP_NOZORDER|SWP_NOACTIVATE
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);
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}
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//+---------------------------------------------------------------------------
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