简单的HELLO MFC程序运行问题
这是HELLO.H头文件
class CMyApp:public CWinApp
{
public:
virtual bool initinstance();
};

class cmainwindow:public CFrameWnd
{
public:
cmainwindow();

protected:
afx_msg void onpaint();
declare_message_map();
};
这是源代码
# include<afxwin.h>
# include"hello.h"
CMyApp myApp;
/////////////////////////////////////////
bool CMyApp::initinstance()
{
m_pMainWnd=new cmainwindow;
m_pMainWnd->ShowWindow(m_nCmdShow);
m_pMainWnd->UpdateWindow();
return true;
}
/////////////////////////////////////////
begin_message_map(cmainwindow,CFrameWnd);
on_wm_paint();
end_message_map();
cmainwindow::cmainwindow()
{
Create(NULL,_T("the hello application"));
}
void cmainwindow::onpaint()
{
CPaintDC dc(this);
CRect rect;
GetClientRect(&rect);
dc.DrawText(_T("Hello,MFC!!!!"),-1,&rect,
DT_SINGLELINE|DT_CENTER|DT_VCENTER);
}
我用VC6.0执行该程序，链接编译都没事，就是执行时好像程序会自动结束，不知道为什么
还有就是，看书上的代码里有的是大写有的是小写，那么为什么会有大小写区别，哪几种情况必须大写
两个问题呵呵~~~~·


[解决办法]
你这个程序，没有消息的处理函数 WindowProc()
也就是说，当你要退出的时候，你没有定义如何响应退出的消息，故不能结束。

我给你一个最简单的MFC程序，你可以学一下。
一下文件下载后保存为 .cpp文件。

C/C++ code

// Ex12_01.cpp   Native windows program to display text in a window#include <windows.h>LRESULT WINAPI WindowProc(HWND hWnd, UINT message,                          WPARAM wParam, LPARAM lParam);   // Insert code for WinMain() here (Listing OFWIN_1)// Listing OFWIN_1int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,                   LPSTR lpCmdLine, int nCmdShow){  WNDCLASSEX WindowClass;     // Structure to hold our window's attributes  static LPCTSTR szAppName = L"OFWin";       // Define window class name  HWND hWnd;                                // Window handle  MSG msg;                                  // Windows message structure  WindowClass.cbSize = sizeof(WNDCLASSEX);  // Set structure size  // Redraw the window if the size changes  WindowClass.style   = CS_HREDRAW | CS_VREDRAW;  // Define the message handling function  WindowClass.lpfnWndProc = WindowProc;  WindowClass.cbClsExtra = 0;     // No extra bytes after the window class  WindowClass.cbWndExtra = 0;     // structure or the window instance  WindowClass.hInstance = hInstance;        // Application instance handle  // Set default application icon  WindowClass.hIcon = LoadIcon(0, IDI_APPLICATION);  // Set window cursor to be the standard arrow  WindowClass.hCursor = LoadCursor(0, IDC_ARROW);  // Set gray brush for background color  WindowClass.hbrBackground =                           static_cast<HBRUSH>(GetStockObject(GRAY_BRUSH));  WindowClass.lpszMenuName = 0;             // No menu  WindowClass.lpszClassName = szAppName;    // Set class name  WindowClass.hIconSm = 0;                  // Default small icon  // Now register our window class  RegisterClassEx(&WindowClass);  // Now we can create the window  hWnd = CreateWindow(          szAppName,                       // the window class name          L"A Basic Window the Hard Way",   // The window title          WS_OVERLAPPEDWINDOW,             // Window style as overlapped          CW_USEDEFAULT,          // Default screen position of  upper left          CW_USEDEFAULT,          // corner of our window as x,y...          CW_USEDEFAULT,          // Default window size          CW_USEDEFAULT,          // ....           0,                      // No parent window          0,                      // No menu          hInstance,              // Program Instance handle          0                       // No window creation data        );  ShowWindow(hWnd, nCmdShow);     // Display the window  UpdateWindow(hWnd);             // Cause window client area to be drawn  // The message loop  while(GetMessage(&msg, 0, 0, 0) == TRUE)  // Get any messages  {    TranslateMessage(&msg);                 // Translate the message    DispatchMessage(&msg);                  // Dispatch the message  }  return static_cast<int>(msg.wParam);      // End, so return to Windows}   // Insert code for WindowProc() here (Listing OFWIN_2)// Listing OFWIN_2LRESULT WINAPI WindowProc(HWND hWnd, UINT message,                           WPARAM wParam, LPARAM lParam){  HDC hDC;                       // Display context handle  PAINTSTRUCT PaintSt;           // Structure defining area to be drawn  RECT aRect;                    // A working rectangle  switch(message)                // Process selected messages  {    case WM_PAINT:                     // Message is to redraw the window      hDC = BeginPaint(hWnd, &PaintSt);// Prepare to draw the window      // Get upper left and lower right of client area      GetClientRect(hWnd, &aRect);      SetBkMode(hDC, TRANSPARENT);     // Set text background mode      // Now draw the text in the window client area      DrawText(             hDC,                 // Device context handle             L"But, soft! What light through yonder window breaks?",             -1,                  // Indicate null terminated string             &aRect,              // Rectangle in which text is to be drawn             DT_SINGLELINE|       // Text format - single line             DT_CENTER|           //             - centered in the line             DT_VCENTER);         //             - line centered in aRect      EndPaint(hWnd, &PaintSt);   // Terminate window redraw operation      return 0;    case WM_DESTROY:              // Window is being destroyed      PostQuitMessage(0);      return 0;    default:                      // Any other message - we don't                                  // want to know, so call                                  // default message processing      return DefWindowProc(hWnd, message, wParam, lParam);  }}