win32 滚动条在 C/C++ 程序中不起作用

win32 滚动条在不起作用的屏幕截图

中Win32 滚动条不起作用。这是我在win32 C/C++中的代码

#include <windows.h>
#include <stdio.h>

/*  Declare Windows procedure  */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
HWND text, text2, button, mm;
HMENU hmenu;
void AddMenus(HWND);
char textsave[20];

/*  Make the class name into a global variable  */
char szClassName[ ] ="CodeBlocksWindowsApp";
int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nCmdShow)
{
HWND hwnd;               /* This is the handle for our window */
MSG messages;            /* Here messages to the application are saved */
WNDCLASSEX wincl;        /* Data structure for the windowclass */
/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);
/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL;                 /* No menu */
wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
wincl.cbWndExtra = 0;                      /* structure or the window instance */
/* Use Windows's default colour as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0;
/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0,                   /* Extended possibilites for variation */
szClassName,         /* Classname */
"",       /* Title Text */
WS_OVERLAPPEDWINDOW | WS_VSCROLL, /* default window */
CW_USEDEFAULT,       /* Windows decides the position */
CW_USEDEFAULT,       /* where the window ends up on the screen */
544,                 /* The programs width */
375,                 /* and height in pixels */
HWND_DESKTOP,        /* The window is a child-window to desktop */
NULL,                /* No menu */
hThisInstance,       /* Program Instance handler */
NULL                 /* No Window Creation data */
);
/* Make the window visible on the screen */
ShowWindow (hwnd, nCmdShow);
/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}
/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}

/*  This function is called by the Windows function DispatchMessage()  */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)                  /* handle the messages */
{
case WM_CREATE:
CreateWindow("EDIT", "jdslfkjssfrnrnrnflkjsdfrnflskdjfkl",
WS_VISIBLE | WS_CHILD | WS_BORDER | ES_MULTILINE | ES_AUTOVSCROLL,
20, 70, 490, 130, hwnd, NULL, NULL, NULL);
CreateWindow("EDIT", "jdslfkjssfrnrnrnflkjsdfrnflskdjfkl",
WS_VISIBLE | WS_CHILD | WS_BORDER | ES_MULTILINE | ES_AUTOVSCROLL,
20, 270, 490, 230, hwnd, NULL, NULL, NULL);

break;
case WM_COMMAND:
break;

case WM_DESTROY:
PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
break;
default:                      /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}

return 0;
}

滚动条在此处不起作用。我希望向下拉滚动条，以便可以看到底部的其余部分。这段代码怎么写，滚动条能行吗？