16 Windows编程——系统内置窗口子类型之editComboBox

Posted 2020-12-05 kelamoyujuzhen

edit类型的子窗口

ES_MULTILINE：多行输入文本框

窗口的消息：

WL_COMMAND：

EN_CHANGE：当edit窗口内的文本内容改变的时候，edit子窗口给父窗口发送一个WL_COMMAND消息，其通知码是EN_CHANGE。

WM_GETTEXT：

用SendMessage函数给edit窗口发送这个消息，同时，给wparam参数传递我们想要获得的字符个数，lParam传递一个内存块地址，sendMessage函数返回后，
lParam指向的内存中，将保存获得的字符。

WL_GETTEXTLENGTH：

用 SendMessage函数给edit窗口发送这个消息，将wParam和1Param都赋值为NULL，那SendMessage函数，将返回edit中的字符个数，但这个字符个数不包括NULL结尾字符。

edit空间演示源码

 1 #include<Windows.h>
 2 
 3 LRESULT CALLBACK WindProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
 4 
 5 int WinMain(HINSTANCE hInst, HINSTANCE tmp, LPSTR szCmd, int nShow)
 6 {
 7     WNDCLASS WndClass;
 8     TCHAR* ClassName = TEXT("MyClass");
 9     HWND hwnd;
10     MSG msg;
11     HBRUSH hBrush;
12     hBrush = CreateSolidBrush(RGB(249,98,241));
13 
14     WndClass.cbClsExtra = 0;
15     WndClass.cbWndExtra = 0;
16     WndClass.hbrBackground = hBrush;
17     WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
18     WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
19     WndClass.hInstance = hInst;
20     WndClass.lpfnWndProc = WindProc;
21     WndClass.lpszClassName = ClassName;
22     WndClass.lpszMenuName = NULL;
23     WndClass.style = CS_VREDRAW | CS_HREDRAW;
24 
25     if (!RegisterClass(&WndClass))
26     {
27         MessageBox(NULL, TEXT("Gegister Class Fail!!"), TEXT("error"), MB_OK);
28         return 0;
29     }
30 
31     hwnd = CreateWindow(ClassName, TEXT("Hello"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 500, 300, NULL, NULL, hInst, NULL);
32     if (hwnd == NULL)
33     {
34         MessageBox(NULL, TEXT("Create Window Fail!!"), TEXT("error"), MB_OK);
35         return 0;
36     }
37     ShowWindow(hwnd, nShow);
38     UpdateWindow(hwnd);
39 
40     while (GetMessage(&msg, NULL, 0, 0))
41     {
42         TranslateMessage(&msg);
43         DispatchMessage(&msg);
44     }
45 
46     return 0;
47 }
48 
49 LRESULT CALLBACK WindProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
50 {
51     HDC hdc;
52     static int cx, cy;
53     static editHwnd, staticHwnd;
54     TCHAR str[1024];
55     int length;
56     switch (message)
57     {
58     case WM_CREATE:
59         editHwnd = CreateWindow(TEXT("edit"),NULL, WS_CHILD | WS_VISIBLE|WS_BORDER|ES_MULTILINE|ES_AUTOVSCROLL , 0, 0, 0, 0, hwnd, (HMENU)1, GetModuleHandle(NULL), NULL);
60         staticHwnd = CreateWindow(TEXT("static"), NULL, WS_CHILD | WS_VISIBLE|WS_BORDER, 0, 0, 0, 0, hwnd, (HMENU)2, GetModuleHandle(NULL), NULL);
61         return 0;
62     case WM_SIZE:
63         cx = LOWORD(lParam);
64         cy = HIWORD(lParam);
65         MoveWindow(editHwnd, 0, 0, cx/2, cy/2, TRUE);
66         MoveWindow(staticHwnd, cx / 2, cy / 2, cx, cy, TRUE);
67         return 0;
68     case WM_COMMAND:
69         if (HIWORD(wParam)==EN_CHANGE)
70         {
71             length = SendMessage(editHwnd, WM_GETTEXTLENGTH, NULL, NULL) + 1;
72             length = length > 1023 ? 1023 : length;
73             SendMessage(editHwnd, WM_GETTEXT, length, (LPARAM)str) ;
74             str[length] = ‘/0‘;
75             SetWindowText(staticHwnd,str);
76         }
77         return 0;
78     case WM_DESTROY:
79         PostQuitMessage(0);
80         return 0;
81     default:
82         break;
83     }
84 
85     return DefWindowProc(hwnd, message, wParam, lParam);
86 }

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运行结果

ComboBox类型的子窗口 

ComboBox子窗口的三种主要子类型：

CB_ADDSTRING：在combobox控件的list框中，增加一个字符串，wParam=NULL，lParam符串的指针。

WL_COMMAND：

CBN_SELCHANGE：当combobox中的选项发生变化时，发送这个通知码，其中LOWORD（lParam）就是这个combobox的窗口标识ID。

CB_GETCURSEL：用SendMessage函数，发送这个消息给combobox子窗口，那么这个函数将返回被选中的列表项的索引（索引是从0开始的）。wParam=lParam=NULL.

演示代码

 1 #include<Windows.h>
 2 #include<WinUser.h>
 3 #include<tchar.h>
 4 #include<stdio.h>
 5 
 6 LRESULT CALLBACK WindProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
 7 
 8 int WinMain(HINSTANCE hInst, HINSTANCE tmp, LPSTR szCmd, int nShow)
 9 {
10     WNDCLASS WndClass;
11     TCHAR* ClassName = TEXT("MyClass");
12     HWND hwnd;
13     MSG msg;
14 
15     WndClass.cbClsExtra = 0;
16     WndClass.cbWndExtra = 0;
17     WndClass.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
18     WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
19     WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
20     WndClass.hInstance = hInst;
21     WndClass.lpfnWndProc = WindProc;
22     WndClass.lpszClassName = ClassName;
23     WndClass.lpszMenuName = NULL;
24     WndClass.style = CS_VREDRAW | CS_HREDRAW;
25 
26     if (!RegisterClass(&WndClass))
27     {
28         MessageBox(NULL, TEXT("Gegister Class Fail!!"), TEXT("error"), MB_OK);
29         return 0;
30     }
31 
32     //CreateWindow返回之前，会发送WM_CREATE消息
33     hwnd = CreateWindow(ClassName, TEXT("Hello"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 500, 300, NULL, NULL, hInst, NULL);
34     if (hwnd == NULL)
35     {
36         MessageBox(NULL, TEXT("Create Window Fail!!"), TEXT("error"), MB_OK);
37         return 0;
38     }
39     ShowWindow(hwnd, nShow);
40     UpdateWindow(hwnd);
41 
42     while (GetMessage(&msg, NULL, 0, 0))
43     {
44         TranslateMessage(&msg);
45         DispatchMessage(&msg);
46     }
47 
48     return 0;
49 }
50 
51 LRESULT CALLBACK WindProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
52 {
53     PAINTSTRUCT pt;
54     HDC hdc;
55     static HWND ComboHwnd1, ComboHwnd2, ComboHwnd3,button,staticHwnd;
56     TCHAR str[1024];
57     switch (message)
58     {
59     case WM_CREATE:
60         ComboHwnd1 = CreateWindow(TEXT("ComboBox"), NULL, WS_CHILD | WS_VISIBLE | CBS_SIMPLE|CBS_AUTOHSCROLL|WS_VSCROLL, 0, 0, 0, 0, hwnd, (HMENU)1, GetModuleHandle(NULL), NULL);
61         ComboHwnd2 = CreateWindow(TEXT("ComboBox"), NULL, WS_CHILD | WS_VISIBLE | CBS_DROPDOWN, 0, 0, 0, 0, hwnd, (HMENU)2, GetModuleHandle(NULL), NULL);
62         ComboHwnd3 = CreateWindow(TEXT("ComboBox"), NULL, WS_CHILD | WS_VISIBLE | CBS_DROPDOWNLIST, 0, 0, 0, 0, hwnd, (HMENU)3, GetModuleHandle(NULL), NULL);
63         button = CreateWindow(TEXT("button"), TEXT("OK"), WS_CHILD | WS_VISIBLE , 0, 0, 0, 0, hwnd, (HMENU)4, GetModuleHandle(NULL), NULL);
64         staticHwnd= CreateWindow(TEXT("static"), NULL, WS_CHILD | WS_VISIBLE, 0, 0, 0, 0, hwnd, (HMENU)5, GetModuleHandle(NULL), NULL);
65         return 0;
66     case WM_SIZE:
67         MoveWindow(ComboHwnd1, 0, 0, 100, 100, TRUE);
68         MoveWindow(ComboHwnd2, 150, 0, 100, 150, TRUE);
69         MoveWindow(ComboHwnd3, 300, 0, 100, 150, TRUE);
70         MoveWindow(button, 20, 120, 50, 25, TRUE);
71         MoveWindow(staticHwnd, 0, 150, 100, 100, TRUE);
72         SendMessage(ComboHwnd1, CB_ADDSTRING, NULL, (LPARAM)TEXT("char-1"));
73         SendMessage(ComboHwnd1, CB_ADDSTRING, NULL, (LPARAM)TEXT("char-2"));
74         SendMessage(ComboHwnd1, CB_ADDSTRING, NULL, (LPARAM)TEXT("char-3"));
75         SendMessage(ComboHwnd1, CB_ADDSTRING, NULL, (LPARAM)TEXT("char-4"));
76         SendMessage(ComboHwnd1, CB_ADDSTRING, NULL, (LPARAM)TEXT("char-5"));
77         SendMessage(ComboHwnd1, CB_ADDSTRING, NULL, (LPARAM)TEXT("char-6"));
78         SendMessage(ComboHwnd1, CB_ADDSTRING, NULL, (LPARAM)TEXT("char-7"));
79         SendMessage(ComboHwnd1, CB_ADDSTRING, NULL, (LPARAM)TEXT("char-8"));
80         SendMessage(ComboHwnd1, CB_ADDSTRING, NULL, (LPARAM)TEXT("char-9"));
81         return 0;
82     case WM_COMMAND:
83         if (HIWORD(wParam) == CBN_SELCHANGE)
84         {
85             GetWindowText(ComboHwnd1,str,50);
86             SetWindowText(staticHwnd,str);
87         }
88         return 0;
89     case WM_DESTROY:
90         PostQuitMessage(0);
91         return 0;
92     default:
93         break;
94     }
95 
96     return DefWindowProc(hwnd, message, wParam, lParam);
97 }

View Code

运行结果：