#define IDC_MAIN_EDIT 101LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_CREATE:
{
hEdit = CreateWindowEx(WS_EX_CLIENTEDGE, "EDIT", "",WS_CHILD|WS_VISIBLE | WS_VSCROLL | WS_HSCROLL | ES_MULTILINE | ES_AUTOVSCROLL | ES_AUTOHSCROLL,0,0,100,100,hwnd, (HMENU)IDC_MAIN_EDIT,GetModuleHandle(NULL), NULL);
}
}
}
这里(HMENU)IDC_MAIN_EDIT有和用处?将创建的EDIT句柄和IDC_MAIN_EDIT联系起来?
{
switch(msg)
{
case WM_CREATE:
{
hEdit = CreateWindowEx(WS_EX_CLIENTEDGE, "EDIT", "",WS_CHILD|WS_VISIBLE | WS_VSCROLL | WS_HSCROLL | ES_MULTILINE | ES_AUTOVSCROLL | ES_AUTOHSCROLL,0,0,100,100,hwnd, (HMENU)IDC_MAIN_EDIT,GetModuleHandle(NULL), NULL);
}
}
}
这里(HMENU)IDC_MAIN_EDIT有和用处?将创建的EDIT句柄和IDC_MAIN_EDIT联系起来?
下面的代码在vc6.0中运行:
#include <windows.h>const char g_szClassName[] = "myWindowClass";#define IDC_MAIN_EDIT 101LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_CREATE:
{
HFONT hfDefault;
HWND hEdit; hEdit = CreateWindowEx(WS_EX_CLIENTEDGE, "EDIT", "",
WS_CHILD | WS_VISIBLE | WS_VSCROLL | WS_HSCROLL | ES_MULTILINE | ES_AUTOVSCROLL | ES_AUTOHSCROLL,
0, 0, 100, 100, hwnd, (HMENU)IDC_MAIN_EDIT, GetModuleHandle(NULL), NULL);//(HMENU)IDC_MAIN_EDIT
if(hEdit == NULL)
MessageBox(hwnd, "Could not create edit box.", "Error", MB_OK | MB_ICONERROR); hfDefault = GetStockObject(DEFAULT_GUI_FONT);
SendMessage(hEdit, WM_SETFONT, (WPARAM)hfDefault, MAKELPARAM(FALSE, 0));
}
break;
case WM_SIZE:
{
HWND hEdit;
RECT rcClient; GetClientRect(hwnd, &rcClient); hEdit = GetDlgItem(hwnd, IDC_MAIN_EDIT);
SetWindowPos(hEdit, NULL, 0, 0, rcClient.right, rcClient.bottom, SWP_NOZORDER);
}
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; wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
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+1);
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;
} hwnd = CreateWindowEx(
0,
g_szClassName,
"theForger's Tutorial Application",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, 480, 320,
NULL, NULL, hInstance, NULL); if(hwnd == NULL)
{
MessageBox(NULL, "Window Creation Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
} ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd); while(GetMessage(&Msg, NULL, 0, 0) > 0)
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}将(HMENU)IDC_MAIN_EDIT改成NULL,再次编译运行,看看结果?
原因:在ShowWindow时,产生了WM_SIZE消息。