GetDiskFreeSpace problem

I have a problem with this code :

PHP Code:

---

    LPCTSTR lpDirectoryName=NULL;  //Current disk         
        PULARGE_INTEGER lpFreeBytesAvailable=0;
        PULARGE_INTEGER lpTotalNumberOfBytes=0;    
        PULARGE_INTEGER lpTotalNumberOfFreeBytes=0;

        cout << GetDiskFreeSpaceEx(lpDirectoryName, 
            lpFreeBytesAvailable,
            lpTotalNumberOfBytes,
            lpTotalNumberOfFreeBytes);
    iSize = (unsigned int)(lpTotalNumberOfBytes); 


---

Why iSize is always not the real free space that I have ? What do I do wrong ?

reference:
http://msdn.microsoft.com/library/de...dmref_8bso.asp

Quote:

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lpTotalNumberOfBytes
[out] Pointer to a variable that receives the total number of bytes on the disk that are available to the user associated with the calling thread.
Windows 2000/XP: If per-user quotas are in use, this value may be less than the total number of bytes on the disk.

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Does any of the bolded stuff apply to you? Could that be the problem?

Also, an unsigned int variable isnt going to hold a value larger then ~4 billion. If you have more then 4 gigs free, you might have a problem.

Z.

Interpret the value as __int64 :)

The problem is the size is ZERO always :(

You have to pass a proper pointer. Declare them as ULARGE_INTEGER, and pass them using & to use the address.

Code:

---

        unsigned __int64 iSize;

                LPCTSTR lpDirectoryName=NULL;         
                PULARGE_INTEGER lpFreeBytesAvailable=0;
                PULARGE_INTEGER lpTotalNumberOfBytes=0;   
                PULARGE_INTEGER lpTotalNumberOfFreeBytes=0;

                cout << GetDiskFreeSpaceEx(lpDirectoryName,
                        lpFreeBytesAvailable,
                        lpTotalNumberOfBytes,
                        lpTotalNumberOfFreeBytes);
        iSize = (unsigned int)(lpTotalNumberOfBytes);
                cout << iSize;

---

Quote:

---

Originally posted by MasterDaok

Code:

---

        unsigned __int64 iSize;

        LPCTSTR lpDirectoryName = NULL;         
        ULARGE_INTEGER lpFreeBytesAvailable = 0;
        ULARGE_INTEGER lpTotalNumberOfBytes = 0;   
        ULARGE_INTEGER lpTotalNumberOfFreeBytes = 0;

        cout << GetDiskFreeSpaceEx(lpDirectoryName,
                        &lpFreeBytesAvailable,
                        &lpTotalNumberOfBytes,
                        &lpTotalNumberOfFreeBytes);
        iSize = lpTotalNumberOfBytes.QuadPart;
                cout << iSize;

---

---

...that should work, but passing NULL for the directory name will use the current disk.

i have more than 0 for size :D

Maybe you're right parksie. Maybe those windows names DO confuse people...

Encapsulating the fact that it's a pointer inside a new type name is just inviting confusion. Far easier to say ULARGE_INTEGER* rather than PU_LARGE_INTEGER.

And less messing around with the type system! :D

Code:

---

unsigned __int64 iSize;

        LPCTSTR lpDirectoryName = NULL;         
        ULARGE_INTEGER lpFreeBytesAvailable = 0;
        ULARGE_INTEGER lpTotalNumberOfBytes = 0;   
        ULARGE_INTEGER lpTotalNumberOfFreeBytes = 0;

        cout << GetDiskFreeSpaceEx(lpDirectoryName,
                        &lpFreeBytesAvailable,
                        &lpTotalNumberOfBytes,
                        &lpTotalNumberOfFreeBytes);
        iSize = lpTotalNumberOfBytes.QuadPart;
                cout << iSize;

        iSize = (unsigned int)(lpTotalNumberOfBytes);

---

[code]

No constructor could take the source type, or constructor overload resolution was ambiguous
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(32) : error C2440: 'initializing' : cannot convert from 'const int' to 'union _ULARGE_INTEGER'
No constructor could take the source type, or constructor overload resolution was ambiguous
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(33) : error C2440: 'initializing' : cannot convert from 'const int' to 'union _ULARGE_INTEGER'
No constructor could take the source type, or constructor overload resolution was ambiguous
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(40) : error C2593: 'operator <<' is ambiguous
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002\C++.cpp(42) : error C2440: 'type cast' : cannot convert from 'union _ULARGE_INTEGER' to 'unsigned int'
No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(44) : error C2143: syntax error : missing ';' before 'else'
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002(45) : error C2143: syntax error : missing ';' before '{'
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002(45) : error C2447: missing function header (old-style formal list?)
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(49) : error C2143: syntax error : missing ';' before 'else'
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(52) : error C2065: 'iSize' : undeclared identifier
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002cpp(54) : error C2501: 'memset' : missing storage-class or type specifiers
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(54) : error C2373: 'memset' : redefinition; different type modifiers
c:\program files\microsoft visual studio\vc98\include\string.h(103) : see declaration of 'memset'
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(54) : error C2078: too many initializers
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(56) : error C2143: syntax error : missing ';' before '.'
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(56) : error C2501: 'fileOut' : missing storage-class or type specifiers
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(56) : error C2143: syntax error : missing ';' before '.'
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(57) : error C2143: syntax error : missing ';' before '.'
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(57) : error C2501: 'fileOut' : missing storage-class or type specifiers
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(57) : error C2086: 'fileOut' : redefinition
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(57) : error C2143: syntax error : missing ';' before '.'
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(58) : error C2143: syntax error : missing ';' before '.'
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(58) : error C2501: 'fileOut' : missing storage-class or type specifiers
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(58) : error C2086: 'fileOut' : redefinition
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(58) : error C2143: syntax error : missing ';' before '.'
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(66) : error C2143: syntax error : missing ';' before '<<'
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(66) : error C2501: 'cout' : missing storage-class or type specifiers
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(66) : error C2143: syntax error : missing ';' before '<<'
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(68) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(68) : error C2143: syntax error : missing ';' before '}'
C:\Documents and Settings\Patrik Desjardins\Mes documents\doc\Summer2002.cpp(68) : error C2143: syntax error : missing ';' before '}'
Error executing cl.exe.
[code]

Take off the "=0" from those initialisers.

The rest of the errors don't apply to that code, methinks you missed an #include or using somewhere.

ok thx you man you have a lots of patience with me :)

last question. Why when I do that:
char *cData = new char[iSize];
and iSize is very big so when I pass it in the debug I see iSize changing to 0 when it see the live above, why?

Don't cast to int, it's half the size. Use __int64 like in the variable declaration. Actually, don't even cast at all, the types match...

No, wait.

You can't use iSize because it's 64-bit. Pointers are only valid up to 2GB (half of 32-bit's range) on Win32. Trying to allocate more will throw a bad_alloc exception.

I dont cast : char *cData = new char[iSize];

where do you see casting ? and iSize is __int64

Quote:

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Code:

---

iSize = (unsigned int)(lpTotalNumberOfBytes);

---

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If I see what you're doing, you're trying to allocate an array big enough for the unused space on the disk...that couldn't possibly work.

Quote:

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you're trying to allocate an array big enough for the unused space on the disk...that couldn't possibly work.

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C++ limit maybe....

Nope, OS limit. How you could possibly need to allocate 2GB of memory is beyond me.

You could do it on a native 64-bit system (my project at work running on a high-end SGI Origin server was quite happy to use 4.7GB of RAM :)).

When we think of that 2GB is a lots of byte lol, I hadn't realize that :rolleyes: :)