Copy to clipboard

Hi,

I'm triying to copy some information to clipboard but I have a problem when I want open the file "temporal.dat". The aplication never open the file. I have other application with the same code and everything run perfectly. Could you help me?

This is my code

Code:

---

void CAdestView::CopiarVariables()
{
        int sel=-1;                                // Nos indicara el elemento que esta seleccionado
        CString aux_nomb;                // Almacena el nombre para comparar
        FILE *fichero;                        // Nombre del fichero temporal
        int x=0;                                // Numero de elementos copiados
        CString nombre_b;                // Nombre temporal de la variable para copiar en el fichero
        CString ausente_b;                // Valor ausente temporal de la variable para copiar en el fichero
        CString etiqueta_b;                // Etiqueta temporal de la variable para copiar en el fichero
        CString labels_b;                // Labels        char labels_b[30];                //
        CString datostxt;
        int t=0;

        // Se abre el fichero para escritura
        fichero= fopen("\\temporal.dat","wb");

        // Se obtiene un puntero de la clase view
        CAdestDoc* pDoc = GetDocument();
        ASSERT_VALID(pDoc);
        if(!fichero)
        {
                MessageBox(_T("No se pudo abrir el fichero"), _T("Error"), 0x10010);
                return;
        }
        // Bucle para determinar el numero de elementos a copiar
        do
        {
                sel = m_Lista.GetNextItem(sel,LVNI_SELECTED);
                aux_nomb=m_Lista.GetItemText(sel,0);
                if (sel!=-1)
                        x++;

        }while (sel != -1);       

        // Abro el portapapeles
        if(!OpenClipboard())
        {
                MessageBox(_T("No se pudo abrir el portapapeles"), _T("Error"), 0x10010);
                return;
        }
        // Registro el formato Datos Adest
        UINT cf= RegisterClipboardFormat(_T("Variables Adest"));
        const char *text3 = "";
        HGLOBAL hText = GlobalAlloc(GMEM_MOVEABLE |GMEM_DDESHARE, strlen(text3)+1);
        char *ptr = (char *)GlobalLock(hText);
        strcpy(ptr, text3);
        GlobalUnlock(hText);
        SetClipboardData(cf, hText);
        // Cierro el portapapeles
        CloseClipboard();

        // Se situa el puntero del fichero donde apunta el cursor
        fseek(fichero,sizeof(int),SEEK_SET);
        // Se escribe el numero de elementos a copiar
        fwrite(&x,sizeof(int),1,fichero);
        INT_PTR contador=0;
        contador=pDoc->Variables.GetSize();
        // Bucle para copiar todos los elementos seleccionados
        do
        {
                sel = m_Lista.GetNextItem(sel,LVNI_SELECTED);
                aux_nomb = m_Lista.GetItemText(sel,0);
                for (int i=0;i<contador;i++)
                {
                        CDatos* pDat = (CDatos*)pDoc->Variables.GetAt(i);
                        // El nombre debe coincidir
                        if (pDat->Nombre == aux_nomb)
                        {

                                // Se copia el nombre a la variable temporal del fichero
                                nombre_b=pDat->Nombre;
                                // Se escribe en el fichero el tamaño
                                fwrite(&pDat->Tam,sizeof(int),1,fichero);
                                // Se escribe en el fichero el nombre
                                fwrite(&nombre_b,sizeof(CString)*30,1,fichero);
                                // Se escribe en el fichero el tipo
                                fwrite(&pDat->Tipo,sizeof(int),1,fichero);
                                // Dependiendo del tipo de variable se escribe en el
                                // fichero unos u otros datos
                                if(pDat->Tipo==0)
                                {
                                        for(t=0;t<pDat->Tam;t++)
                                                //Se escriben los datos en el fichero
                                                fwrite(&pDat->Datos[t],sizeof(double),1,fichero);
                                }
                                else
                                {
                                        for(t=0;t<pDat->Tam;t++)
                                        {
                                                //Se escriben los datos en el fichero
                                                datostxt=pDat->Dat_Txt[t];
                                                fwrite(&datostxt,sizeof(CString)*20,1,fichero);
                                        }
                                }

                                // Se copia el dato ausente a la variable temporal del fichero
                                ausente_b=pDat->Ausente;
                                // Se escribe en el fichero el dato ausente
                                fwrite(&ausente_b,sizeof(CString)*10,1,fichero);
                                // Se escribe en el fichero la escala
                                fwrite(&pDat->Escala,sizeof(int),1,fichero);
                                // Se copia la etiqueta a la variable temporal del fichero
                                etiqueta_b=pDat->Etiqueta;
                                // Se escribe en el fichero la etiqueta temporal
                                fwrite(&etiqueta_b,sizeof(CString)*100,1,fichero);
                                // Se copia las labels a la variable temporal del fichero
                                labels_b=pDat->Labels;
                                // Se escribe en el fichero las labels temporal
                                fwrite(&labels_b,sizeof(CString)*80,1,fichero);
                                // Se escribe en el fichero la precision
                                fwrite(&pDat->Precision ,sizeof(int),1,fichero);
                        }
                }
        }while (sel != -1);       

        // Se cierra el fichero
        fclose(fichero);       
}

---

Quote:

---

Originally Posted by a343

Hi,

I'm triying to copy some information to clipboard but I have a problem when I want open the file "temporal.dat". The aplication never open the file.
...
This is my code

Code:

---

void CAdestView::CopiarVariables()
{
        ...
        // Se abre el fichero para escritura
        fichero= fopen("\\temporal.dat","wb");
        ...
        // Se cierra el fichero
        fclose(fichero);       
}

---

---

You write you "want to open the file "temporal.dat". But in your code you are trying to open the "\\temporal.dat" file! :confused:

I meant "\\temporal.dat". I'm sorry.

Quote:

---

Originally Posted by a343

I meant "\\temporal.dat". I'm sorry.

---

But does the file \temporal.dat exist? :confused:
Try to open (just copy/paste this name) \temporal.dat in Windows explorer or in cmd console...

I can't find the file how "\\temporal.dat" or "\temporal.dat" but I look in windows explorer how "temporal.dat" and I find the file in C:\Users\Antonio\AppData\Local\VirtualStore

But in other aplicattion I have the same code with "\\temporal.dat" and everything run perfectly.
What happen?
How I must to edit my code?

Why are you putting the slash in front of the file name?

Becouse is the direction of this file. That mean that the file is in the unit C: or the unit where is the windows file

Are you sure it is correct?
Where did you read any info about such a meaning of backslash? :confused:

I'm not sure, I had this code from other person who did my project before.
If you know other way to do this function, tell me

Maybe it is not like this, but I saw in this web something like that

http://copstone.com/2009/12/abrir-ap...ernas-desde-c/

Putting a (forward) / before a path indicates it is an absolute path on Linux/Unix. I don't know whether or not \ has a similar meaning on Windows.

Quote:

---

Originally Posted by a343;2031377Maybe it is not like this, but I saw in this web something like that

[url

http://copstone.com/2009/12/abrir-aplicaciones-externas-desde-c/[/url]

---

I don't see anything similar to the file name beginning with backslash in the site you referred to.
If you see - please, post the quote.

Now, I put my path, where is the file, "C:\\Users\Antonio\AppData\Local\VirtualStore", but it can't open the file. Why???

Quote:

---

Originally Posted by a343

Now, I put my path, where is the file, "C:\\Users\Antonio\AppData\Local\VirtualStore", but it can't open the file. Why???

---

This path is wrong.
Please, show the exact code snippet where you pass in the path and file name to open the file.

Quote:

---

Originally Posted by a343

Now, I put my path, where is the file, "C:\\Users\Antonio\AppData\Local\VirtualStore", but it can't open the file. Why???

---

How would we know?? From MSDN "Always check the return value to see if the pointer is NULL before performing any further operations on the file. If an error occurs, the global variableerrno is set and may be used to get specific error information. For further information, see errno."

I think Victor is alluding to the possibility that you're not using escape characters correctly in your string literal.

What does this problem have to do with your thread title?

Please read the code of the function, it copies informations to clipboard.

Victor, you are right. But my aplication will run in several computer, and I need some way to put the path in general way not only my path

Quote:

---

Originally Posted by a343

Please read the code of the function, it copies informations to clipboard.

Victor, you are right. But my aplication will run in several computer, and I need some way to put the path in general way not only my path

---

But the problem is you can't open a file. It has nothing to do with the clipboard.

Please, don't disturb, if you have some answer, tell me, but if not, please, don't change the subject.
Thank you

Quote:

---

Originally Posted by a343

Please, don't disturb, if you have some answer, tell me, but if not, please, don't change the subject.
Thank you

---

I'm trying to help you get information. If you're looking for information on how to open a file and you post a subject about the clipboard that has nothing to do with your question, people that may know about files but not the clipboard may skip your thread.

I showed you MSDN's information on how to find a detailed error message. Did you try it yet?

Yes, I did. I used this funtion
http://cplusplus.com/forum/windows/2068/

And the result was:

It can't open the file failed with error 0: The operation was complete rightly

Quote:

---

Originally Posted by a343

Yes, I did. I used this funtion
http://cplusplus.com/forum/windows/2068/

And the result was:

It can't open the file failed with error 0: The operation was complete rightly

---

Why did you ignore what GCDEF wrote you:

Quote:

---

Originally Posted by GCDEF

How would we know?? From MSDN "Always check the return value to see if the pointer is NULL before performing any further operations on the file. If an error occurs, the global variableerrno is set and may be used to get specific error information. For further information, see errno."

---

Why did you ignore what MSDN claims in fopen, _wfopen article:

Quote:

---

Return Value
Each of these functions returns a pointer to the open file. A null pointer value indicates an error. If filename or mode is NULL or an empty string, these functions trigger the invalid parameter handler, which is described in Parameter Validation. If execution is allowed to continue, these functions return NULL and set errno to EINVAL.

For more information, see errno, _doserrno, _sys_errlist, and _sys_nerr.

---

:confused:

You can't simply use a file name if you expect to find a file in the virtual store folder. This assumes that your current directory is already set to the virtual store folder which is probably not a good assumption. An effective solution might use the ::SHGetSpecialFolderPath() API function like this:

Code:

---

CString VirtualStoreFilePath(LPCTSTR fileName)
{
        CString path;
        LPTSTR buffer = path.GetBuffer(MAX_PATH);
       
        if(::SHGetSpecialFolderPath(0, buffer, CSIDL_LOCAL_APPDATA, FALSE))
        {
                VERIFY(::PathAppend(buffer, _T("VirtualStore")));
                VERIFY(::PathAppend(buffer, fileName));
        }
       
        path.ReleaseBuffer();
       
        return path;
}

---

Now, to find the full path of a file called "temporal.dat" you would do this:

Code:

---

CString fullPath = VirtualStoreFilePath(_T("temporal.dat"));
fichero= fopen(fullPath,"wb");

---

This should work on any computer / Windows OS that implements the VirtualStore folder. However, the function I have shown is very basic and does only minimal error checking. A real program would only use this as a starting point to build a more reliable application. You should note that this function may return an empty string so you would need to determine why.

Also, note that this function will return the full path of a file assumed to be located in the virtual store but it absolutely does not guarantee that the file exists. In fact, the virtual store root folder typically does not contain individual files but instead subfolders named after applications that use it. With that in mind, you may have to use the function like this:

Code:

---

CString fullPath = VirtualStoreFilePath(_T("MyAppName\\temporal.dat"));
fichero= fopen(fullPath,"wb");

---

Quote:

---

Originally Posted by 0xC0000005

You can't simply use a file name if you expect to find a file in the virtual store folder. This assumes that your current directory is already set to the virtual store folder which is probably not a good assumption. An effective solution might use the ::SHGetSpecialFolderPath() API function like this:

Code:

---

CString VirtualStoreFilePath(LPCTSTR fileName)
{
        CString path;
        LPTSTR buffer = path.GetBuffer(MAX_PATH);
       
        if(::SHGetSpecialFolderPath(0, buffer, CSIDL_LOCAL_APPDATA, FALSE))
        {
                VERIFY(::PathAppend(buffer, _T("VirtualStore")));
                VERIFY(::PathAppend(buffer, fileName));
        }
       
        path.ReleaseBuffer();
       
        return path;
}

---

Now, to find the full path of a file called "temporal.dat" you would do this:

Code:

---

CString fullPath = VirtualStoreFilePath(_T("temporal.dat"));
fichero= fopen(fullPath,"wb");

---

This should work on any computer / Windows OS that implements the VirtualStore folder. However, the function I have shown is very basic and does only minimal error checking. A real program would only use this as a starting point to build a more reliable application. You should note that this function may return an empty string so you would need to determine why.

Also, note that this function will return the full path of a file assumed to be located in the virtual store but it absolutely does not guarantee that the file exists. In fact, the virtual store root folder typically does not contain individual files but instead subfolders named after applications that use it. With that in mind, you may have to use the function like this:

Code:

---

CString fullPath = VirtualStoreFilePath(_T("MyAppName\\temporal.dat"));
fichero= fopen(fullPath,"wb");

---

---

Thank you so much, I used the first option becouse I didnt understand very good the second and everything run perfectly.

In the second option, MyAppName is the name of my aplication, I suposse, but I wrote

CString fullPath = VirtualStoreFilePath(_T("Adest\\temporal.dat"));
fichero= fopen(fullPath,"wb");

and it couldn't open the file