问题描述

VC++6.0开发工具，打开串口，重叠IO操作，提示有访问冲突，求大神指点

#include
#include

LRESULT CALLBACK WndProc (HWND hwnd UINT msg WPARAM wParam LPARAM lParam);

#define WM_TRANSFINISHED (WM_USER + 1)

typedef struct
{
HWND hwnd;
HANDLE hComm;
}PARAMS *PPARAMS;

int WINAPI WinMain (HINSTANCE hInstance HINSTANCE hPreInstance LPSTR lpCmdLine int nShowCmd)
{
char* szAppName = ""TEST"";
MSG msg;
HWND hwnd;
WNDCLASS wndclass;

wndclass.style          = CS_HREDRAW | CS_VREDRAW;wndclass.lpfnWndProc    = WndProc;wndclass.cbClsExtra     = 0;wndclass.cbWndExtra     = 0;wndclass.hIcon          = LoadIcon (0 IDI_APPLICATION);wndclass.hCursor        = LoadCursor (0 IDC_ARROW);wndclass.hbrBackground  = (HBRUSH) GetStockObject (WHITE_BRUSH);wndclass.hInstance      = hInstance;wndclass.lpszClassName  = szAppName;wndclass.lpszMenuName   = NULL;if (!RegisterClass (&wndclass))    MessageBox (NULLThe window class is wrong!"" szAppName MB_OK);hwnd = CreateWindow (szAppNameFirst Show!"" WS_OVERLAPPEDWINDOW                     CW_USEDEFAULT CW_USEDEFAULT CW_USEDEFAULT CW_USEDEFAULT                     NULL NULL hInstance NULL);ShowWindow (hwnd nShowCmd);UpdateWindow (hwnd);while (GetMessage (&msg NULL 0 0)){    TranslateMessage (&msg);    DispatchMessage (&msg);}return msg.wParam;

}

VOID ThreadProc (PVOID pvoid)
{
BOOL fWait;
DWORD Event;
PPARAMS pparams;
OVERLAPPED OverlapWait;

pparams = (PPARAMS)pvoid;OverlapWait.hEvent = CreateEvent (NULL TRUE TRUE NULL);fWait = WaitCommEvent (pparams->hComm &Event &OverlapWait);fWait = GetOverlappedResult (pparams->hComm &OverlapWait NULL TRUE);if (fWait)    if (EV_TXEMPTY == Event)    {        SendMessage (pparams->hwnd WM_TRANSFINISHED 0 0);    }

}

LRESULT CALLBACK WndProc (HWND hwnd UINT message WPARAM wParam LPARAM lParam)
{
static char* name[5] = {""f1(K)""f2(K)""RU/RD""PHASE""OTHER""};
static HINSTANCE hInstance;
static int cxChar cyChar cxClient cyClient;
static HWND hwndEdit[5] hwndButton hwndText[5];
int i;
PAINTSTRUCT ps;
HDC hdc;

char                temp[13];float               data[5];char*               trans;DWORD               cbToWrite = 20 cbWritten;static HANDLE       hCom;static OVERLAPPED   OverlapWrite;DCB                 myDCB;COMMTIMEOUTS        timeout = {0 0 0 30 30};static PARAMS       params;switch (message){case WM_CREATE:    hInstance = (HINSTANCE)GetWindowLong (hwnd GWL_HINSTANCE);    hwndButton = CreateWindow (""button""SEND"" WS_CHILD | WS_VISIBLE | WS_BORDER                  hwnd (HMENU)0 hInstance NULL);    for (i = 1; i < 6; i++)    {        hwndEdit[i - 1] = CreateWindow (""edit""0"" WS_CHILD | WS_VISIBLE | WS_BORDER | ES_LEFT | ES_NUMBER                                        hwnd (HMENU)i hInstance NULL);        hwndText[i - 1] = CreateWindow (""static"" name[i-1] WS_CHILD | WS_VISIBLE | SS_CENTER                                         hwnd (HMENU)(i + 5) hInstance NULL);    }    return 0;case WM_SIZE:    cxClient    = LOWORD (lParam);    cyClient    = HIWORD (lParam);    cxChar      = LOWORD (GetDialogBaseUnits ());    cyChar      = HIWORD (GetDialogBaseUnits ());    MoveWindow (hwndButton cxChar*2 cyChar*2 cxChar*8 cyChar*3/2 TRUE);    for (i = 0; i < 5; i++)    {        MoveWindow (hwndEdit[i] cxChar*12 cyChar*(5 + 3*i) cxChar*8 cyChar*3/2 TRUE);        MoveWindow (hwndText[i] cxChar*2 cyChar*(5 + 3*i) cxChar*8 cyChar*3/2 TRUE);    }    return 0;case WM_CTLCOLORSTATIC:    SetBkColor ((HDC)wParam GetSysColor (COLOR_BTNHIGHLIGHT));    return (LRESULT) (HBRUSH)GetStockObject (WHITE_BRUSH);case WM_CTLCOLORBTN:    SetBkColor ((HDC)wParam GetSysColor (COLOR_BTNHIGHLIGHT));    return (LRESULT) (HBRUSH)GetStockObject (WHITE_BRUSH);case WM_PAINT:    hdc = BeginPaint (hwnd &ps);    EndPaint (hwnd &ps);    return 0;case WM_DESTROY:    GetWindowText (hwndEdit[0] temp 13);    MessageBox (NULL tempOK"" MB_OK);    PostQuitMessage (0);    return 0;case WM_TRANSFINISHED:    EnableWindow (hwndButton TRUE);    CloseHandle (hCom);    MessageBox (NULLTransform done successfully!""Comm"" MB_OK);    return 0;case WM_COMMAND:    if (hwndButton == (HWND)lParam && (HIWORD (wParam) == BN_CLICKED || HIWORD (wParam) == BN_DBLCLK))    {        EnableWindow (hwndButton FALSE);        for (i = 0; i < 5; i++)        {            GetWindowText (hwndEdit[i] temp 13);            data[i] = atof (temp);        }        trans = (char*) data;        hCom = CreateFile (""COM3"" GENERIC_WRITE 0 NULL OPEN_EXISTING                            FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED                            NULL);        if (hCom == INVALID_HANDLE_VALUE)        {            MessageBox (NULLCANNOT OPEN THE PORT!""Comm"" MB_OK);            return 0;        }        SetupComm (hCom 1024 512);        GetCommState (hCom &myDCB);        myDCB.BaudRate  = 9600;        myDCB.fBinary   = TRUE;        myDCB.fParity   = FALSE;        myDCB.ByteSize  = 8;        myDCB.Parity    = NOPARITY;        myDCB.StopBits  = ONESTOPBIT;        if (!SetCommState (hCom &myDCB))        {            MessageBox (NULL TEXT (""port set failure"") NULL MB_OK);            return 0;        }        if (!SetCommTimeouts (hCom &timeout))        {            MessageBox (NULL TEXT (""Timeout set failure"") NULL MB_OK);            return 0;        }        if (!SetCommMask (hCom EV_TXEMPTY))        {            MessageBox (NULL TEXT (""event set failure"") NULL MB_OK);            return 0;        }        OverlapWrite.hEvent = CreateEvent (NULL TRUE TRUE NULL);        params.hComm = hCom;        params.hwnd = hwnd;        _beginthread(ThreadProc 0 &params);        //WriteFile (hCom trans cbToWrite &cbWritten &OverlapWrite);        WriteFile (hComa"" 1 &cbWritten &OverlapWrite);        GetOverlappedResult (hCom &OverlapWrite NULL TRUE);    }    return 0;}return DefWindowProc (hwnd message wParam lParam);

}