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16 Windows编程——系统内置窗口子类型之edit、ComboBox

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内容图文

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

技术分享图片 技术分享图片 
                 1 #include<Windows.h>
 2 3LRESULT CALLBACK WindProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
 4 5int 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));
1314     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;
2425if (!RegisterClass(&WndClass))
26    {
27         MessageBox(NULL, TEXT("Gegister Class Fail!!"), TEXT("error"), MB_OK);
28return0;
29    }
3031     hwnd = CreateWindow(ClassName, TEXT("Hello"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 500, 300, NULL, NULL, hInst, NULL);
32if (hwnd == NULL)
33    {
34         MessageBox(NULL, TEXT("Create Window Fail!!"), TEXT("error"), MB_OK);
35return0;
36    }
37    ShowWindow(hwnd, nShow);
38    UpdateWindow(hwnd);
3940while (GetMessage(&msg, NULL, 0, 0))
41    {
42         TranslateMessage(&msg);
43         DispatchMessage(&msg);
44    }
4546return0;
47}
4849LRESULT CALLBACK WindProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
50{
51    HDC hdc;
52staticint cx, cy;
53static editHwnd, staticHwnd;
54     TCHAR str[1024];
55int length;
56switch (message)
57    {
58case 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);
61return0;
62case 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);
67return0;
68case WM_COMMAND:
69if (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        }
77return0;
78case WM_DESTROY:
79         PostQuitMessage(0);
80return0;
81default:
82break;
83    }
8485return DefWindowProc(hwnd, message, wParam, lParam);
86 }
View Code

运行结果

技术分享图片

ComboBox类型的子窗口 

ComboBox子窗口的三种主要子类型：

技术分享图片

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

技术分享图片 技术分享图片 
                 1 #include<Windows.h>
 2 #include<WinUser.h>
 3 #include<tchar.h>
 4 #include<stdio.h>
 5 6LRESULT CALLBACK WindProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
 7 8int WinMain(HINSTANCE hInst, HINSTANCE tmp, LPSTR szCmd, int nShow)
 9{
10    WNDCLASS WndClass;
11     TCHAR* ClassName = TEXT("MyClass");
12    HWND hwnd;
13    MSG msg;
1415     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;
2526if (!RegisterClass(&WndClass))
27    {
28         MessageBox(NULL, TEXT("Gegister Class Fail!!"), TEXT("error"), MB_OK);
29return0;
30    }
3132//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);
34if (hwnd == NULL)
35    {
36         MessageBox(NULL, TEXT("Create Window Fail!!"), TEXT("error"), MB_OK);
37return0;
38    }
39    ShowWindow(hwnd, nShow);
40    UpdateWindow(hwnd);
4142while (GetMessage(&msg, NULL, 0, 0))
43    {
44         TranslateMessage(&msg);
45         DispatchMessage(&msg);
46    }
4748return0;
49}
5051LRESULT CALLBACK WindProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
52{
53    PAINTSTRUCT pt;
54    HDC hdc;
55static HWND ComboHwnd1, ComboHwnd2, ComboHwnd3,button,staticHwnd;
56     TCHAR str[1024];
57switch (message)
58    {
59case 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);
65return0;
66case 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"));
81return0;
82case WM_COMMAND:
83if (HIWORD(wParam) == CBN_SELCHANGE)
84        {
85             GetWindowText(ComboHwnd1,str,50);
86            SetWindowText(staticHwnd,str);
87        }
88return0;
89case WM_DESTROY:
90         PostQuitMessage(0);
91return0;
92default:
93break;
94    }
9596return DefWindowProc(hwnd, message, wParam, lParam);
97 }
View Code

运行结果：

技术分享图片

 

原文：https://www.cnblogs.com/kelamoyujuzhen/p/9343731.html

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