exttest.cpp

来自「pxa270实验板上的」· C++ 代码 · 共 86 行

// ExtTest.cpp : 定义应用程序的入口点。
//

#include "stdafx.h"
#include "ExtTest.h"
#include <windows.h>


#define TIMERID 1

BOOL CALLBACK DialogProc(HWND hwndDlg,UINT uMsg,WPARAM wParam,LPARAM lParam);
static BOOL InitDialog(HWND hDlg);
HINSTANCE ghInstance;

int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPTSTR    lpCmdLine,
                   int       nCmdShow)
{
	ghInstance = hInstance;
	return DialogBox(hInstance, MAKEINTRESOURCE(IDD_DIALOG1),NULL,(DLGPROC)DialogProc);
}
HANDLE hDev = NULL;
UINT idTimer = 0;
BOOL CALLBACK DialogProc(HWND hwndDlg,UINT uMsg,WPARAM wParam,LPARAM lParam)
{
	switch(uMsg)
	{
	case WM_INITDIALOG:
		hDev = CreateFile(TEXT("KEY1:"),GENERIC_READ|GENERIC_WRITE,0,NULL,OPEN_EXISTING,0,0);
		if(hDev == INVALID_HANDLE_VALUE)
		{
			MessageBox(NULL,_T("不能打开设备。"),_T("Error"),MB_OK|MB_ICONINFORMATION);
			EndDialog(hwndDlg,0);
			return FALSE;

		}
		idTimer = SetTimer(hwndDlg,TIMERID,100,NULL);
		return TRUE;
	case WM_CLOSE:
		KillTimer(hwndDlg,idTimer);
		CloseHandle(hDev);
		EndDialog(hwndDlg,0);
		return TRUE;
	case WM_TIMER:
		if(wParam == TIMERID)
		{
			DWORD bytes;
			DWORD val = 0;
			static DWORD oldval = 1;
			if(ReadFile(hDev,&val,sizeof(val),&bytes,NULL))
			{
				if(val!= oldval)
				{
					SetDlgItemInt(hwndDlg,IDC_EDIT1,val,FALSE);
					oldval = val;
				}
			}
			else 
			{
				TCHAR str[64];
				wsprintf(str,TEXT("Error %d"),GetLastError());
				SetDlgItemText(hwndDlg,IDC_EDIT1,str);

			}

		}
		return TRUE;
	case WM_COMMAND:
		switch(LOWORD(wParam))
		{
		case IDC_BUTTON1:
			{
				DWORD bytes;
				DWORD val = 0;
				WriteFile(hDev,&val,sizeof(DWORD),&bytes,NULL);

			}
			return TRUE;

		}
		break;
			
	}
	return FALSE;
}