在《WIN程序设计》第20篇中的多线程的随机矩形例中,原用的是_beginthread(),我将其改为CreateThread(),并删去process.h.其它的不变我发现例子无法运行。请教其中的原因????(附改后的code)
#include <windows.h>
//clude <process.h>LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;HWND hwnd ;
int cxClient, cyClient ;int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("RndRctMT") ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, TEXT ("Random Rectangles"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}DWORD WINAPI Thread (PVOID pvoid)
{
HBRUSH hBrush ;
HDC hdc ;
int xLeft, xRight, yTop, yBottom, iRed, iGreen, iBlue ;
while (TRUE)
{
if (cxClient != 0 || cyClient != 0)
{
xLeft = rand () % cxClient ;
xRight = rand () % cxClient ;
yTop = rand () % cyClient ;
yBottom = rand () % cyClient ;
iRed = rand () & 255 ;
iGreen = rand () & 255 ;
iBlue = rand () & 255 ;
hdc = GetDC (hwnd) ;
hBrush = CreateSolidBrush (RGB (iRed, iGreen, iBlue)) ;
SelectObject (hdc, hBrush) ;
Rectangle (hdc, min (xLeft, xRight), min (yTop, yBottom),
max (xLeft, xRight), max (yTop, yBottom)) ;
ReleaseDC (hwnd, hdc) ;
DeleteObject (hBrush) ;
}
}
}LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_CREATE:
//_beginthread (Thread, 0, NULL) ;
CreateThread(NULL, 0, Thread, NULL, 0, 0);
return 0 ;
case WM_SIZE:
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;
return 0 ;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
#include <windows.h>
//clude <process.h>LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;HWND hwnd ;
int cxClient, cyClient ;int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("RndRctMT") ;
MSG msg ;
WNDCLASS wndclass ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, TEXT ("Random Rectangles"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}DWORD WINAPI Thread (PVOID pvoid)
{
HBRUSH hBrush ;
HDC hdc ;
int xLeft, xRight, yTop, yBottom, iRed, iGreen, iBlue ;
while (TRUE)
{
if (cxClient != 0 || cyClient != 0)
{
xLeft = rand () % cxClient ;
xRight = rand () % cxClient ;
yTop = rand () % cyClient ;
yBottom = rand () % cyClient ;
iRed = rand () & 255 ;
iGreen = rand () & 255 ;
iBlue = rand () & 255 ;
hdc = GetDC (hwnd) ;
hBrush = CreateSolidBrush (RGB (iRed, iGreen, iBlue)) ;
SelectObject (hdc, hBrush) ;
Rectangle (hdc, min (xLeft, xRight), min (yTop, yBottom),
max (xLeft, xRight), max (yTop, yBottom)) ;
ReleaseDC (hwnd, hdc) ;
DeleteObject (hBrush) ;
}
}
}LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_CREATE:
//_beginthread (Thread, 0, NULL) ;
CreateThread(NULL, 0, Thread, NULL, 0, 0);
return 0 ;
case WM_SIZE:
cxClient = LOWORD (lParam) ;
cyClient = HIWORD (lParam) ;
return 0 ;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}
CreateThread(NULL, 0, Thread, NULL, 0, &ThreadId);