【发布时间】：2014-03-22 00:37:04
【问题描述】：
我正在尝试学习 Windows API。我设法创建了一个带有按钮和编辑框的窗口。单击按钮时，我想尝试更改编辑框中的文本。
这里是主循环：
while(GetMessage(&Msg, NULL, 0, 0) > 0)
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
这里是windows回调
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_CREATE:
{
HWND hWndEdit = CreateWindowEx(WS_EX_CLIENTEDGE,
"EDIT","",
WS_CHILD|WS_VISIBLE|ES_MULTILINE|ES_AUTOVSCROLL|ES_AUTOHSCROLL,
50,100,200,100,hwnd,
(HMENU) IDC_EDITBOX,
GetModuleHandle(NULL),
NULL);
HWND hWndButton = CreateWindowEx(NULL,
"BUTTON",
"OK",
WS_TABSTOP|WS_VISIBLE|WS_CHILD|BS_DEFPUSHBUTTON,
50, 220, 100, 24, hwnd,
(HMENU)IDC_BUTTON,
GetModuleHandle(NULL),
NULL);
}
break;
case WM_COMMAND:
switch(LOWORD(wParam))
{
case IDC_BUTTON:
{
SendMessage(hWndEdit,WM_SETTEXT,NULL,(LPARAM)"BUTTON");
}
break;
case IDC_EDITBOX:
{
MessageBox(NULL,"EDIT","editbox", MB_ICONINFORMATION|MB_OK);
}
break;
default:
MessageBox(NULL,"default","Command",MB_ICONINFORMATION|MB_OK);
break;
}
break;
case WM_SETTEXT:
{
MessageBox(NULL,"SetTEXT","BOX",MB_ICONINFORMATION|MB_OK);
}
break;
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,msg,wParam,lParam);
}
return 0;
}
当我点击按钮时，我调用了SendMessage(...)，所以不应该在我的主循环中选择它并发送到WndProc()吗？如果是这样，那为什么我的开关盒没有捕捉到它？如果没有，我该如何为这个编辑框设置回调函数？
编辑：完整代码
#include <windows.h>
#define IDC_BUTTON 101
#define IDC_EDITBOX 102
HWND hWndEdit;
const char g_szClassName[] = "myWindowClass";
//Step 4: the Window Proc
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_CREATE:
{
HWND hWndEdit = CreateWindowEx(WS_EX_CLIENTEDGE,
"EDIT","",
WS_CHILD|WS_VISIBLE|ES_MULTILINE|ES_AUTOVSCROLL|ES_AUTOHSCROLL,
50,100,200,100,hwnd,
(HMENU) IDC_EDITBOX,
GetModuleHandle(NULL),
NULL);
HWND hWndButton = CreateWindowEx(NULL,
"BUTTON",
"OK",
WS_TABSTOP|WS_VISIBLE|WS_CHILD|BS_DEFPUSHBUTTON,
50, 220, 100, 24, hwnd,
(HMENU)IDC_BUTTON,
GetModuleHandle(NULL),
NULL);
}
break;
case WM_COMMAND:
switch(LOWORD(wParam))
{
case IDC_BUTTON:
{
//MessageBox(NULL,"EDIT","editbox", MB_ICONINFORMATION|MB_OK);
SendMessage(hWndEdit,WM_SETTEXT,NULL,(LPARAM)"BUTTON");
}
break;
case IDC_EDITBOX:
{
MessageBox(NULL,"EDIT","editbox", MB_ICONINFORMATION|MB_OK);
}
break;
default:
MessageBox(NULL,"default","Command",MB_ICONINFORMATION|MB_OK);
break;
}
break;
case WM_SETTEXT:
{
MessageBox(NULL,"SetTEXT","BOX",MB_ICONINFORMATION|MB_OK);
}
break;
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,msg,wParam,lParam);
}
return 0;
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wc;
HWND hwnd;
MSG Msg;
//Registering the Window Class
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = CS_HREDRAW|CS_VREDRAW;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH) (COLOR_WINDOW);
wc.lpszMenuName = NULL;
wc.lpszClassName = g_szClassName;
wc.hIconSm = LoadIcon(NULL,IDI_APPLICATION);
if(!RegisterClassEx(&wc))
{
MessageBox(NULL, "Window Registration Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
return 0;
}
//Creating the Window
hwnd = CreateWindowEx(
0,
//WS_EX_CLIENTEDGE,
g_szClassName,
"Inventory",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 400, 300,
NULL, NULL, hInstance, NULL);
if(hwnd == NULL)
{
MessageBox(NULL, "Window Creation Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
// Step 3: The Message Loop
while(GetMessage(&Msg, NULL, 0, 0) > 0)
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}
【问题讨论】：
标签： c++ winapi user-interface