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Elba Patricia Jocobi
Cdt
Registrado: 08 Jun 2003Mensajes: 2Ubicación: Tijuana, B. C. Mexico
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 Publicado: Dom 08 Jun, 2003 11:32 pm Asunto: Como saber la etiqueta de los discos? |
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Hola, a todos!
Soy principiante es mi 5to. dia de conocer mas o menos como funciona builder c++ 5.0 estoy tratando de encontrarle sentido a un codigo que encontre que dice "Etiqueta en disco" trae el siguiente codigo //-----
String LeerEtiquetaDisco(char unidad)
{
char szLabel[256];
char szRaiz[4] = {unidad, ':', '\\', '\0'};
bool ret = GetVolumeInformation(szRaiz, szLabel, sizeof(szLabel),
NULL, NULL, NULL, NULL, NULL);
return (ret ? szLabel : "");
}
//-----
ShowMessage( LeerEtiquetaDisco('c') ); alguien me podria explicar por favor en que consiste y como puedo hacer un programita que me diga la etiqueta de los discos? se los agradecere mucho  Atte: Patty |
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lycopersium
Lt
Registrado: 12 Oct 2002Mensajes: 90Ubicación: Roquetas de Mar - Almería
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| Publicado: Lun 09 Jun, 2003 5:52 pm Asunto: |
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Hola, para entender con detalle cada argumento de la función GetVolumeInformation deberías consultar la ayuda del API de windows. En el ejemplo que pones szRaiz es un array de caracteres que indica el directorio raíz ("C:\\" por ejemplo, donde la 'C' en tu ejemplo se la pasas a la función), szLabel es otro array donde la función te devuelve el nombre del volumen, en el siguiente argumento se le indica el tamaño de ese array y en los siguientes argumentos se obtienen otros detalles como el nº de serie,...(si está puesto a NULL es porque no los necesitas).
Si no hay problemas GetVolumeInformation devuelve true.
Con respecto al programa q quieres hacer, si no he entendido mal, es básicamente la función que tienes.
Saludos! |
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Cesar C. Salazar Gonzalez
Master
Registrado: 01 Oct 2002Mensajes: 2155Ubicación: San Cristóbal de Las Casas, Chiapas
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| Publicado: Lun 19 Ene, 2004 4:45 am Asunto: |
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Esto esta en la ayuda de builder 6.0
| Código: |
The GetVolumeInformation function returns information about a file system and volume whose root directory is specified.
BOOL GetVolumeInformation(
LPCTSTR lpRootPathName, // address of root directory of the file system
LPTSTR lpVolumeNameBuffer, // address of name of the volume
DWORD nVolumeNameSize, // length of lpVolumeNameBuffer
LPDWORD lpVolumeSerialNumber, // address of volume serial number
LPDWORD lpMaximumComponentLength, // address of system's maximum filename length
LPDWORD lpFileSystemFlags, // address of file system flags
LPTSTR lpFileSystemNameBuffer, // address of name of file system
DWORD nFileSystemNameSize // length of lpFileSystemNameBuffer
);
Parameters
lpRootPathName
Points to a string that contains the root directory of the volume to be described. If this parameter is NULL, the root of the current directory is used. If this parameter is a UNC name, you must follow it with an additional backslash. For example, you would specify \\MyServer\MyShare as \\MyServer\MyShare\.
lpVolumeNameBuffer
Points to a buffer that receives the name of the specified volume.
nVolumeNameSize
Specifies the length, in characters, of the volume name buffer. This parameter is ignored if the volume name buffer is not supplied.
lpVolumeSerialNumber
Points to a variable that receives the volume serial number. This parameter can be NULL if the serial number is not required.
lpMaximumComponentLength
Points to a doubleword value that receives the maximum length, in characters, of a filename component supported by the specified file system. A filename component is that portion of a filename between backslashes.
The value stored in variable pointed to by *lpMaximumComponentLength is used to indicate that long names are supported by the specified file system. For example, for a FAT file system supporting long names, the function stores the value 255, rather than the previous 8.3 indicator. Long names can also be supported on systems that use the New Technology file system.
lpFileSystemFlags
Points to a doubleword that receives flags associated with the specified file system. This parameter can be any combination of the following flags, with one exception: FS_FILE_COMPRESSION and FS_VOL_IS_COMPRESSED are mutually exclusive.
Value Meaning
FS_CASE_IS_PRESERVED If this flag is set, the file system preserves the case of filenames when it places a name on disk.
FS_CASE_SENSITIVE If this flag is set, the file system supports case-sensitive filenames.
FS_UNICODE_STORED_ON_DISK If this flag is set, the file system supports Unicode in filenames as they appear on disk.
FS_PERSISTENT_ACLS If this flag is set, the file system preserves and enforces ACLs. For example, NTFS preserves and enforces ACLs, and FAT does not.
FS_FILE_COMPRESSION The file system supports file-based compression.
FS_VOL_IS_COMPRESSED The specified volume is a compressed volume; for example, a DoubleSpace volume.
lpFileSystemNameBuffer
Points to a buffer that receives the name of the file system (such as FAT or NTFS).
nFileSystemNameSize
Specifies the length, in characters, of the file system name buffer. This parameter is ignored if the file system name buffer is not supplied.
Return Values
If all the requested information is retrieved, the return value is nonzero.
If not all the requested information is retrieved, the return value is zero. To get extended error information, call GetLastError.
Remarks
If you are attempting to obtain information about a floppy drive that does not have a floppy disk or a CD-ROM drive that does not have a compact disc, the system displays a message box asking the user to insert a floppy disk or a compact disc, respectively. To prevent the system from displaying this message box, call the SetErrorMode function with SEM_FAILCRITICALERRORS.
The FS_VOL_IS_COMPRESSED flag is the only indicator of volume-based compression. The file system name is not altered to indicate compression. This flag comes back set on a DoubleSpace volume, for example. With volume-based compression, an entire volume is either compressed or not compressed.
The FS_FILE_COMPRESSION flag indicates whether a file system supports file-based compression. With file-based compression, individual files can be compressed or not compressed.
The FS_FILE_COMPRESSION and FS_VOL_IS_COMPRESSED flags are mutually exclusive; both bits cannot come back set.
The maximum component length value, stored in the DWORD variable pointed to by lpMaximumComponentLength, is the only indicator that a volume supports longer-than-normal FAT (or other file system) file names. The file system name is not altered to indicate support for long file names.
The GetCompressedFileSize function obtains the compressed size of a file. The GetFileAttributes function can determine whether an individual file is compressed. |
Espero te sirva aun...
_________________
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