求解答 关与WIN32的诸多有关问题

求解答 关与WIN32的诸多问题
#include <windows.h>
#include <stdio.h>

LRESULT CALLBACK WindowProc(
  HWND hwnd, // handle to window
  UINT uMsg, // message identifier
  WPARAM wParam, // first message parameter
  LPARAM lParam // second message parameter
);

int WINAPI WinMain(
  HINSTANCE hInstance, // handle to current instance
  HINSTANCE hPrevInstance, // handle to previous instance
  LPSTR lpCmdLine, // command line
  int nCmdShow // show state
)
{
WNDCLASS wndcls;
wndcls.cbClsExtra = 0;
wndcls.cbWndExtra = 0;
wndcls.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndcls.hCursor = LoadCursor(0,IDC_ARROW);
wndcls.hIcon = LoadIcon(0, IDI_APPLICATION);
wndcls.hInstance = hInstance;
wndcls.lpfnWndProc = WindowProc;
wndcls.lpszClassName = "WeiXin";
wndcls.lpszMenuName = 0;
wndcls.style = CS_VREDRAW | CS_HREDRAW;

RegisterClass(&wndcls);

HWND hwnd;
hwnd = CreateWindow("WeiXin", "计算机", WS_OVERLAPPEDWINDOW,0,0, 300, 500, 0,0,hInstance,0);

ShowWindow(hwnd, nCmdShow);

MSG msg;
while(GetMessage(&msg, hwnd, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;

}

LRESULT CALLBACK WindowProc(
  HWND hwnd, // handle to window
  UINT uMsg, // message identifier
  WPARAM wParam, // first message parameter
  LPARAM lParam // second message parameter
)
{
static string m_str="";
static CPoint point = 0;
static CPoint point1;
//HDC hdc;
//hdc = GetDC(hwnd);
PAINTSTRUCT ps;

TEXTMETRIC tm;
CClientDC dc(this);
dc.GetTextMetrics(&tm);

//CSize sz = dc.GetTextExtent(m_str);

switch(uMsg)
{
case WM_PAINT:
//hdc = BeginPaint(hwnd, &ps);
dc.TextOut(50, 50,"dhfkhjkfds");
//EndPaint(hwnd,&ps);
break;
case WM_CHAR:
if (13==wParam)
{
m_str.empty();
//CPoint point1;
point.y += tm.tmHeight;
}
else if(8 == wParam)
{
COLORREF *pOld = dc.SetTextColor(dc.GetBkColor());
dc.TextOut(point.x,point.y,m_str);
m_str -= wParam;
dc.SetTextColor(pOld);
point1.x = point.x + sz.cx;
point1.y = point.y;
}
else
{
m_str += wParam;
}
dc.TextOut(point.x,point.y,m_str);

CSize sz = dc.GetTextExtent(m_str);
point1.x = point.x + sz.cx;
point1.y = point.y;
SetCaretPos(point1.x,point1.y);

break;
case WM_LBOUTTONDOWN:
m_str.empty();
point.x = LOWORD(lParam);
point.y = HIWORD(lParam);
SetCaretPos(point.x,point.y);
break;
case WM_CLOSE:
if(IDYES==MessageBox(hwnd,"你是否要退出程序","WeiXin",MB_YESNO))
{
DestroyWindow(hwnd);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
DefWindowProc(hwnd,uMsg,wParam,lParam);
}

return 0;

}

有很多问题，求各位高手细心解答

[解决办法]
给你一个示例自己运行下：

C/C++ code

#include <Windows.h>#include <tchar.h>LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam){    switch (uMsg)    {    case WM_CREATE:        return 0;    case WM_PAINT:        break;    case WM_DESTROY:        PostQuitMessage(0);        return 0;    }    return DefWindowProc(hWnd, uMsg, wParam, lParam);}int WINAPI _tWinMain(HINSTANCE hInstance, HINSTANCE, PTSTR /*pszCmdLine*/, int /*nCmdShow*/){    WNDCLASSEX wcex;    wcex.cbSize = sizeof(WNDCLASSEX);    wcex.style = CS_HREDRAW | CS_VREDRAW;    wcex.lpfnWndProc = WndProc;    wcex.cbClsExtra = 0;    wcex.cbWndExtra = 0;    wcex.hInstance = hInstance;    wcex.hIcon = LoadIcon(NULL, IDI_APPLICATION);    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);    wcex.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);    wcex.lpszMenuName = NULL;    wcex.lpszClassName = _T("Windows Demo Class");    wcex.hIconSm = wcex.hIcon;    if (!RegisterClassEx(&wcex))    {        MessageBox(NULL, _T("RegisterClassEx failed!"), _T("Windows Demo"), MB_ICONERROR);        return 0;    }    HWND hWnd = CreateWindowEx(WS_EX_APPWINDOW,                               _T("Windows Demo Class"),                               _T("Windows Demo"),                               WS_OVERLAPPEDWINDOW,                               CW_USEDEFAULT,                               CW_USEDEFAULT,                               CW_USEDEFAULT,                               CW_USEDEFAULT,                               NULL,                               NULL,                               hInstance,                               NULL);    ShowWindow(hWnd, SW_SHOW);    UpdateWindow(hWnd);    MSG msg;    while (GetMessage(&msg, NULL, 0, 0) > 0)    {        TranslateMessage(&msg);        DispatchMessage(&msg);    }    return msg.wParam;}