main.c

ReactOS是一些高手根据Windows XP的内核编写出的类XP。内核实现机理和API函数调用几乎相同。甚至可以兼容XP的程序。喜欢研究系统内核的人可以看一看。

	DeleteObject(Font);

}

void showUninstaller() {
	int Split_Vertical = 200;
	RECT Rect;

        GetClientRect(hwnd,&Rect);
	ShowWindow(hUninstallButton,SW_SHOW);
	MoveWindow(hDownloadButton,(Split_Vertical+Rect.right-Rect.left)/2,Rect.bottom-Rect.top-45,140,35,TRUE);;
}

void hideUninstaller() {
	int Split_Vertical = 200;
	RECT Rect;

        GetClientRect(hwnd,&Rect);
	ShowWindow(hUninstallButton,SW_HIDE);
	MoveWindow(hDownloadButton,(Split_Vertical+Rect.right-Rect.left)/2-70,Rect.bottom-Rect.top-45,140,35,TRUE);
}

void startUninstaller(WCHAR* Uninstaller) {
	STARTUPINFOW si;
	PROCESS_INFORMATION pi;

	memset(&si, 0, sizeof(si));
	si.cb = sizeof(si);
	CreateProcessW(NULL,Uninstaller,NULL,NULL,FALSE,0,NULL,NULL,&si,&pi); 
	CloseHandle(pi.hThread);
	// WaitForSingleObject(pi.hProcess, INFINITE); // If you want to wait for the Unistaller
	CloseHandle(pi.hProcess);
        hideUninstaller();
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
	static RECT DescriptionRect;

	switch (Message)
	{
		case WM_CREATE:
		{
			if(!SetupControls(hwnd))
				return -1;
			ShowMessage(Strings[IDS_WELCOME_TITLE], Strings[IDS_WELCOME]);
		} 
		break;

		case WM_PAINT:
		{
			PAINTSTRUCT ps;
			HDC hdc = BeginPaint(hwnd, &ps);
			HDC BackbufferHdc = CreateCompatibleDC(hdc);
			HBITMAP BackbufferBmp = CreateCompatibleBitmap(hdc, ps.rcPaint.right, ps.rcPaint.bottom);
			SelectObject(BackbufferHdc, BackbufferBmp);
			
			FillRect(BackbufferHdc, &ps.rcPaint, CreateSolidBrush(RGB(235,235,235)));
			DrawBitmap(BackbufferHdc, 10, 12, hLogo);
			DrawDescription(BackbufferHdc, DescriptionRect);
			
			BitBlt(hdc, 0, 0, ps.rcPaint.right, ps.rcPaint.bottom, BackbufferHdc, 0, 0, SRCCOPY);
			DeleteObject(BackbufferBmp);
			DeleteDC(BackbufferHdc);
			EndPaint(hwnd, &ps);
		}
		break;

		case WM_COMMAND:
		{
			if(HIWORD(wParam) == BN_CLICKED)
			{
				if (lParam == (LPARAM)hDownloadButton)
				{
					if(SelectedApplication)
						DialogBoxW(GetModuleHandle(NULL), MAKEINTRESOURCEW(IDD_DOWNLOAD), 0, DownloadProc);
					else
						ShowMessage(Strings[IDS_NO_APP_TITLE], Strings[IDS_NO_APP]);
				}
				else if (lParam == (LPARAM)hUninstallButton)
				{
					if(SelectedApplication)
					{
						WCHAR Uninstaller[200];
						if(StrCmpW(SelectedApplication->RegName, L"")) {
							if(getUninstaller(SelectedApplication->RegName, Uninstaller))
								startUninstaller(Uninstaller);
						}
					}
				}
				else if (lParam == (LPARAM)hUpdateButton)
				{
					ShowMessage(Strings[IDS_UPDATE_TITLE], Strings[IDS_UPDATE]);
				}
				else if (lParam == (LPARAM)hHelpButton)
				{
					ShowMessage(Strings[IDS_HELP_TITLE], Strings[IDS_HELP]);
				}
			}
		}
		break;

		case WM_NOTIFY:
		{
			LPNMHDR data = (LPNMHDR)lParam;
			if(data->code == TVN_SELCHANGED)
			{
				BOOL bShowUninstaller = FALSE;
				if(data->hwndFrom == hCategories) 
				{
					struct Category* Category = (struct Category*) ((LPNMTREEVIEW)lParam)->itemNew.lParam;
					CategoryChoosen (hApps, Category);
				}
				else if(data->hwndFrom == hApps) 
				{
					SelectedApplication = (struct Application*) ((LPNMTREEVIEW)lParam)->itemNew.lParam;
					if(SelectedApplication)
					{
						ApplicationText[0]=L'\0';
						if(StrCmpW(SelectedApplication->Version, L"")) {
							StrCatW(ApplicationText, Strings[IDS_VERSION]);
							StrCatW(ApplicationText, SelectedApplication->Version);
							StrCatW(ApplicationText, L"\n");
						}
						if(StrCmpW(SelectedApplication->Licence, L"")) {
							StrCatW(ApplicationText, Strings[IDS_LICENCE]);
							StrCatW(ApplicationText, SelectedApplication->Licence);
							StrCatW(ApplicationText, L"\n");
						}
						if(StrCmpW(SelectedApplication->Maintainer, L"")) {
							StrCatW(ApplicationText, Strings[IDS_MAINTAINER]);
							StrCatW(ApplicationText, SelectedApplication->Maintainer);
							StrCatW(ApplicationText, L"\n");
						}
						if(StrCmpW(SelectedApplication->Licence, L"") || StrCmpW(SelectedApplication->Version, L"") || StrCmpW(SelectedApplication->Maintainer, L""))
							StrCatW(ApplicationText, L"\n");
						StrCatW(ApplicationText, SelectedApplication->Description);
						ShowMessage(SelectedApplication->Name, ApplicationText);
						WCHAR Uninstaller[200];
						if(StrCmpW(SelectedApplication->RegName, L"")) {
							if(getUninstaller(SelectedApplication->RegName, Uninstaller)) {
								bShowUninstaller = TRUE;
							}
						}
					}
				}
				if (bShowUninstaller)
					showUninstaller();
				else
					hideUninstaller();
			}
		}
		break;

		case WM_SIZING:
		{
			LPRECT pRect = (LPRECT)lParam;
			if (pRect->right-pRect->left < 520)
				pRect->right = pRect->left + 520;

			if (pRect->bottom-pRect->top < 300)
				pRect->bottom = pRect->top + 300;
		}
		break;

		case WM_SIZE:
		{
			int Split_Hozizontal = (HIWORD(lParam)-(45+60))/2 + 60;
			int Split_Vertical = 200;

			ResizeControl(hCategories, 10, 60, Split_Vertical, HIWORD(lParam)-10);
			ResizeControl(hApps, Split_Vertical+5, 60, LOWORD(lParam)-10, Split_Hozizontal);
			RECT Rect = {Split_Vertical+5, Split_Hozizontal+5, LOWORD(lParam)-10, HIWORD(lParam)-50};
			DescriptionRect = Rect;

			MoveWindow(hHelpButton, LOWORD(lParam)-50, 10, 40, 40, TRUE);
			MoveWindow(hUpdateButton, LOWORD(lParam)-100, 10, 40, 40, TRUE);
			if(IsWindowVisible(hUninstallButton))
				MoveWindow(hDownloadButton, (Split_Vertical+LOWORD(lParam))/2, HIWORD(lParam)-45, 140, 35, TRUE);
			else
				MoveWindow(hDownloadButton, (Split_Vertical+LOWORD(lParam))/2-70, HIWORD(lParam)-45, 140, 35, TRUE);
			MoveWindow(hUninstallButton, (Split_Vertical+LOWORD(lParam))/2-140, HIWORD(lParam)-45, 140, 35, TRUE);
		}
		break;

		case WM_DESTROY:
		{
			DeleteObject(hLogo);	
			if(Root.Children)
				FreeTree(Root.Children);
			PostQuitMessage(0);
			return 0;
		}
		break;
	}

	return DefWindowProc (hwnd, Message, wParam, lParam);
}

INT WINAPI wWinMain (HINSTANCE hInstance, HINSTANCE hPrevInst,
					LPTSTR lpCmdLine, INT nCmdShow)
{
	int i;
	WNDCLASSEXW WndClass = {0};
	MSG msg;

	InitCommonControls();

	// Load strings
	for(i=0; i<STRING_COUNT; i++)
		LoadStringW(hInstance, i, Strings[i], MAX_STRING_LENGHT); // if you know a better method please tell me. 

	// Create the window
	WndClass.cbSize			= sizeof(WNDCLASSEX); 
	WndClass.lpszClassName	= L"Downloader";
	WndClass.lpfnWndProc	= WndProc;
	WndClass.hInstance		= hInstance;
	WndClass.style			= CS_HREDRAW | CS_VREDRAW;
	WndClass.hIcon			= LoadIcon(hInstance, MAKEINTRESOURCE(IDI_MAIN));
	WndClass.hCursor		= LoadCursor(NULL, IDC_ARROW);

	RegisterClassExW(&WndClass);

	hwnd = CreateWindowW(L"Downloader", 
						Strings[IDS_WINDOW_TITLE],
						WS_OVERLAPPEDWINDOW|WS_CLIPCHILDREN,
						CW_USEDEFAULT,  
						CW_USEDEFAULT,   
						600, 550, 
						NULL, NULL,
						hInstance, 
						NULL);

	// Show it
	ShowWindow(hwnd, SW_SHOW);
	UpdateWindow(hwnd);

	// Message Loop
	while(GetMessage(&msg,NULL,0,0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return 0;
}