how to write/read in text file with mfc project??

antonio343

I'm trying to read text from a text file. I look for in msdn how to read and write in text file, and I found this: http://msdn.microsoft.com/es-es/library/6337eske.aspx[^] I made this funtion to read from my text file:

void CDlgResultados::loadFromFile(void)
{
CString path= GetUserHomeDir() + _T("\\Documents\\file.txt");

TCHAR	szBuffer\[256\]; 
UINT    nActual = 0; 
CFile	myFile;

if ( myFile.Open(path, CFile::modeCreate |   
   CFile::modeRead ) )
{
   myFile.Write( szBuffer, sizeof( szBuffer ) ); 
   myFile.Flush();
   myFile.Seek( 0, CFile::begin );
   nActual = myFile.Read( szBuffer, sizeof( szBuffer ) ); 
}
m\_Edit.SetWindowTextW(szBuffer);

}

But when I run the app and I press the button to read the file, I get a error that it said: You dont have acces to this file.

Lost User

What is the actual value of the string in your path variable, at the time you try to create the file?

Unrequited desire is character building. OriginalGriff

antonio343

this is the value:

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

Maximilien

Use the class CStdioFile to read text file. google for example, there are many.

Watched code never compiles.

Chris Meech

Rule number 0 when working with files. Always check return codes, so you know which call is failing. :) Best guess is that when you call to Write() to the file, you do not have permissions, since your Open() call doesn't specify that permission. Maybe the create Permission implies this, but I'm not sure. :)

Chris Meech I am Canadian. [heard in a local bar] In theory there is no difference between theory and practice. In practice there is. [Yogi Berra] posting about Crystal Reports here is like discussing gay marriage on a catholic church’s website.[Nishant Sivakumar]

Madhu Nair 0

antonio343 wrote:

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

Open the file using

CFile::modeReadWrite OR CFile::modeWrite

it seems you don't have permission to write.

Lost User

OK, and does that directory exist and can you create that file manually? If so then check also the suggestions from other commenters below.

Unrequited desire is character building. OriginalGriff

antonio343

I changed the mode by modeReadWrite and I get simbols like this:

<pre>쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌쳌﫸Y쳌쳌쳌쳌꣨ɷ쳌쳌偁泇¬</pre>

I also try this:

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);

}

But I get simbols. I think that the problem is the function ReadString doesnt get the text from the file, becouse the simbol that I get are the "rubbish" which is inicializated buf

antonio343

Yes, this directory exist and I made the file manually.

Lost User

In your original code you were writing from an uninitialised buffer, hence the garbage recorded in your file. Check the logic of your code thus:

Create the file with access for writing
Write some text either from a constant string, or from some data built by the program
Close the file
Open the file with access for reading
Read the text into a buffer
Close the file

In each case check the results of your function calls to ensure that your code has completed without error. You can also create your file manually using Notepad or similar text editor.

Unrequited desire is character building. OriginalGriff

antonio343

Yes, I know, I try to do that, and the file is created manually. But I dont know how to read or write in mfc.

David Crow

antonio343 wrote:

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

You are creating an empty file and then attempting to read from it. Is that really what you want? Also, you may want to revise your usage of the | and || operators.

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

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Lost User

See CFile[^], and in particular the Read() and Write() functions.

Unrequited desire is character building. OriginalGriff

antonio343

Nooo. I have a text file that I created manually,and I'd like to read the text from it. I made a mistake when I write ||, but it is not the error

enhzflep

`So, why are you asking for the the file to be Created?

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

| is a bitwise OR, || is a logical OR

antonio343

Yes you are right, I didnt know what mean this argument, if I dont put this argument, everything run rightly

enhzflep

I continue to feel very fortunate that the vast majority of programming (that I see) is done in english. I understand that with function/variable names in my own language I am at an advantage to those for whom they are in a different language. :thumbsup: