C / C++ / MFC

C:\Users\Antonio\Documents\file.txt

antonio343 wrote:

, I get a error that it said:
You dont have acces to this file.

CFile::modeReadWrite OR CFile::modeWrite

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void CDlgResultados::loadFromFile(void)
{
	CString path= GetUserHomeDir() + _T("\\Documents\\file.txt");
	
	CStdioFile f1;
	f1.Open(path, CFile::modeCreate | CFile::modeRead || CFile::typeText);
	
	CStdioFile f(stdin);
	TCHAR buf[100];

	f1.ReadString(buf, 99);

	m_Edit.SetWindowTextW(buf);
}

1. Create the file with access for writing
2. Write some text either from a constant string, or from some data built by the program
3. Close the file
4. Open the file with access for reading
5. Read the text into a buffer
6. Close the file

antonio343 wrote:

f1.Open(path, CFile::modeCreate | CFile::modeRead || CFile::typeText);
TCHAR buf[100];
f1.ReadString(buf, 99);

if ( myFile.Open(path, CFile::modeCreate | CFile::modeRead ) )

pandit84 wrote:

Is there any API which gives me list of Seial Ports available on system.

pandit84 wrote:

QueryDosDevice () but its failed to provide any result .

#include <iostream>
#include <windows.h>

void main(){
   char port_name[16];
     for (int port_number = 1; port_number < 256; ++port_number)
     {
         port_number < 10 ?
             sprintf(port_name, "COM%d", port_number) :
             sprintf(port_name, "\\\\.\\COM%d", port_number);
         HANDLE hFile = ::CreateFile(port_name,
             GENERIC_READ | GENERIC_WRITE, 0, NULL,
             OPEN_EXISTING, 0, NULL);
         if(hFile != INVALID_HANDLE_VALUE)
             std::cout << port_name << std::endl;
         else
         {
             DWORD err = GetLastError();
             if (err == ERROR_ACCESS_DENIED ||
                 err == ERROR_SHARING_VIOLATION)
                 std::cout << port_name << std::endl;
         }
         CloseHandle(hFile);
     }

}