《Windows程序设计》之POPUP2

#include <Windows.h>
#include "RESOURCE.H"
#define ID_EDIT 1
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
TCHAR szAppName[]=TEXT("PopPad2");
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow)
{
	HACCEL hAccel;
	HWND hwnd;
	MSG msg;
	WNDCLASS wndclass;

	wndclass.style=CS_VREDRAW|CS_HREDRAW;
	wndclass.lpfnWndProc=WndProc;
	wndclass.cbClsExtra=0;
	wndclass.cbWndExtra=0;
	wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
	wndclass.hInstance=hInstance;
	//第一个参数不能是NULL,否则会出一些意想不到结果
	wndclass.hIcon=LoadIcon(hInstance,MAKEINTRESOURCE(IDI_ICON1));
	wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
	wndclass.lpszClassName=szAppName;
	//这个地方也不可以是NULL，不然不会有上面的菜单
	wndclass.lpszMenuName=szAppName;
	if(!RegisterClass(&wndclass))
	{
		MessageBox(NULL,TEXT("This program requires Windows NT!"),szAppName,MB_ICONERROR);
		return 0;
	}
	//居中，大小为屏幕一半
	hwnd=CreateWindow(szAppName,szAppName,WS_OVERLAPPEDWINDOW,GetSystemMetrics(SM_CXSCREEN)/4,GetSystemMetrics(SM_CYSCREEN)/4,
				GetSystemMetrics(SM_CXSCREEN)/2,GetSystemMetrics(SM_CYSCREEN)/2,NULL,NULL,hInstance,NULL);
	ShowWindow(hwnd,iCmdShow);
	UpdateWindow(hwnd);
	//调入加速键表
	hAccel=LoadAccelerators(hInstance,szAppName);
	while(GetMessage(&msg,NULL,0,0))
	{
		/*TranslateAccelerator函数确定保存在msg消息结构体中的消息是否是键盘消息。
		如果是，该函数在加速键表中寻找句柄为hAccel的匹配值。如果找到匹配值，它会调用句柄为hwnd的
		窗口过程，就是AskConfirmation(HWND hwnd)。如果键盘加速键ID对应系统菜单的一个菜单项，
		则相应消息为WM_SYSCOMMAND；否则为WM_COMMAND。
		当TranslateAccelerator返回时，如果消息被翻译过(并且已被发送给窗口过程)，则返回值为非零值，否则返回零*/
		if(!TranslateAccelerator(hwnd,hAccel,&msg))
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}
	return msg.wParam;
}

int AskConfirmation(HWND hwnd)
{
	return MessageBox(hwnd,TEXT("Really want to close PopPad2"),szAppName,MB_YESNO|MB_ICONQUESTION);
}
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
	static HWND hwndEdit;
	int iSelect,iEnable;
	switch(message)
	{
	case WM_CREATE:
		/*WS_CHILD子窗口；WS_VISIBLE显示；WS_HSCROLL、WS_VSCROLL两个滚动条；WS_BORDER有边界；ES_LEFT左对齐；ES_MULILINE多行
		ES_AUTOHSCROLL、ES_AUTOVSCROLL自动滚动条*/
		hwndEdit=CreateWindow(TEXT("edit"),NULL,WS_CHILD|WS_VISIBLE|WS_HSCROLL|
			WS_VSCROLL|WS_BORDER|ES_LEFT|ES_MULTILINE|ES_AUTOHSCROLL|ES_AUTOVSCROLL,0,0,0,0,hwnd,
			(HMENU)ID_EDIT,((LPCREATESTRUCT)lParam)->hInstance,NULL);
		return 0;
	case WM_SETFOCUS:
		//设置文本框有交点
		SetFocus(hwndEdit);
		return 0;
	case WM_SIZE:
		//设置大小
		MoveWindow(hwndEdit,0,0,LOWORD(lParam),HIWORD(lParam),TRUE);
		return 0;
		//应该是当下拉菜单变为active前（可以理解为是弹出前）触发。
	case WM_INITMENUPOPUP:
		//按本书意思应该是说，当菜单Edit要显示时，lParam为1
		if(lParam==1)
		{
			//SendMessage确定返回值是否能够撤销，可以的话，就返回TRUE
			EnableMenuItem((HMENU)wParam,IDM_EDIT_UNDO,SendMessage(hwndEdit,EM_CANUNDO,0,0)?MF_ENABLED:MF_GRAYED);
			//IsClipboardFormatAvailable判断剪贴版中是否有相应的数据，有则返回非0
			EnableMenuItem((HMENU)wParam,IDM_EDIT_PASTE,IsClipboardFormatAvailable(CF_TEXT)?MF_ENABLED:MF_GRAYED);
			//获取选定的
			iSelect=SendMessage(hwndEdit,EM_GETSEL,0,0);
			//iSelect的低位是第一个被选中的位置，高位字是紧随选中文本后面的第一个字符的位置，如果相等，表明没有文本被选中
			//这个地方第一次接触
			if(HIWORD(iSelect==LOWORD(iSelect)))
				iEnable=MF_GRAYED;
			else
				iEnable=MF_ENABLED;
			EnableMenuItem((HMENU)wParam,IDM_EDIT_CUT,iEnable);
			EnableMenuItem((HMENU)wParam,IDM_EDIT_COPY,iEnable);
			EnableMenuItem((HMENU)wParam,IDM_EDIT_CLEAR,iEnable);
			return 0;
		}
		break;
	case WM_COMMAND:
		//判断这个WM_COMMAND消息是由哪个地方产生的，菜单的话，lParam为0；
		//子窗口，按键为1
		if(lParam)
		{
			//字符数量太多，超出范围
			if(LOWORD(wParam)==ID_EDIT&&(HIWORD(wParam==EN_ERRSPACE)))
				MessageBox(hwnd,TEXT("Edit control out of space."),szAppName,MB_OK|MB_ICONSTOP);
			return 0;
		}
		else 
		switch(LOWORD(wParam))
		{
		case IDM_FILE_NEW:
		case IDM_FILE_OPEN:
		case IDM_FILE_SAVE:
		case IDM_FILE_SAVE_AS:
		case IDM_FILE_PRINT:
			MessageBeep(0);
			return 0;
		case IDM_APP_EXIT:
			SendMessage(hwnd,WM_CLOSE,0,0);
			return 0;
		case IDM_EDIT_UNDO:
			SendMessage(hwndEdit,WM_UNDO,0,0);
			return 0;
		case IDM_EDIT_CUT:
			SendMessage(hwndEdit,WM_CUT,0,0);
			return 0;
		case IDM_EDIT_COPY:
			SendMessage(hwndEdit,WM_COPY,0,0);
			return 0;
		case IDM_EDIT_PASTE:
			SendMessage(hwndEdit,WM_PASTE,0,0);
			return 0;
		case IDM_EDIT_CLEAR:
			SendMessage(hwndEdit,WM_CLEAR,0,0);
			return 0;
		case IDM_EDIT_SELECT_ALL:
			SendMessage(hwndEdit,EM_SETSEL,0,-1);
			return 0;
		case IDM_HELP_HELP:
			MessageBox(hwnd,TEXT("Help not yet implemented!"),szAppName,MB_OK|MB_ICONEXCLAMATION);
			return 0;
		case IDM_APP_ABOUT:
			MessageBox(hwnd,TEXT("POPPAD2 (c) Charles Petzold,2012"),szAppName,MB_OK|MB_ICONINFORMATION);
			return 0;
		}
		break;
	case WM_CLOSE:
		if(IDYES==AskConfirmation(hwnd))
			DestroyWindow(hwnd);
		return 0;
	case WM_QUERYENDSESSION:
		if(IDYES==AskConfirmation(hwnd))
			return 1;
		else
			return 0;
	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	}
	return DefWindowProc(hwnd,message,wParam,lParam);
}

这次代码是所有的代码，留给自己以后看吧，里面一些东西，很有用的。