About GetFileInfo function

[olive0602]

Hi:

    I want to confirm a file at a web server, so which function can I use?

Thanks

[RyanWhite]

int GetFileInfo (char *fileName, long *fileSize); will be OK.

GetFileInfo

int GetFileInfo (char *fileName, long *fileSize);

Purpose

Verifies whether a file exists. Returns an integer value of zero if no file exists and one if the file exists. fileSize is a long variable that contains the file size in bytes or zero if no file exists.

Example

/* Check for presence of file A:\DATA\TEST1.DAT. */

/* Print its size if file exists or message that states file does not exist. */

int n;
long size;

n = GetFileInfo("a:\\data\\test1.dat",&size);
if (n == 0)
   FmtOut("File does not exist.");
else
   FmtOut("File size = %i[b4]",size);

Parameters

Input
Name	Type	Description
fileName	string	Pathname of the file to check.
Output
Name	Type	Description
fileSize	long	File size in bytes. fileSize is zero if no file exists.

Return Value

Name	Type	Description
status	integer	Indicates whether the specified file exists. Code Description 1 File exists. 0 File does not exist. –1 Maximum number of files already open. You can use GetFmtIOError to get more information about the type of error that occurred.

[RobV]

I am using LabWindows/CVI 2010, to create a distribution of a program that was previously built in an older version of CVI. Each time I try to build the distribution, I receive an error related to the GetFileInfo function that reads as follows:  

(24, 42 Type error in argument 2 to `GetFileInfo'; found 'pointer to long' expected 'pointer to ssize_t'.)

From what I can gather, it seems that the former declaration of a "long" variable called "filesize" has been replaced by a variable type of "ssize_t". Is this correct, and if so, then will it work for me to replace the variable type for the variable "filesize" at its declaration without having to change anything else? I am remiss to change much of this code without some levels of assurance since its original author is no longer around and little documentation remains for explaination of it's original development. 

and the code segment in question is:

void ForceUniqueFilename(int panelHandle, int controlID)
{
int i, cnt;
long filesize;

/* Prepare filename to open data file in case "save data to disk" button is enabled */
GetCtrlVal(panelHandle,controlID,filespec);
cnt=0;
while (GetFileInfo(filespec,&filesize)){
/* current file name exists, add a number in sequence to make it unique */
SplitPath(filespec,driveName,dirName,fileName);
i=StringLength(fileName)-4; /* name minus forced extention of ".RAW" */
fileName[i--]=0; /* replace period with ASCII null to terminate string */
while (isdigit(fileName[i]) && i!=0){
i--; /* move left one char in file name */
}
if (i==0 && isdigit(fileName[0])){
/* bizarre but possible case where base filename is simply a number */
Scan(fileName,"%s>%i",&cnt);
cnt++; /* create next name in numerical sequence */
Fmt(fileName,"%s<%i%s",cnt,".BIN");
}
else{
if (fileName[i+1]!=0)
Scan(&fileName[i+1],"%s>%i",&cnt);
cnt++;
Fmt(&fileName[i+1],"%s<%i%s",cnt,".BIN");
}
Fmt(filespec,"%s<%s%s%s",driveName,dirName,fileName);
}
SetCtrlVal(panelHandle,controlID,filespec);
}

[Wolfgang]

Yes, you are correct, the parameter fileSize has changed from long (up to including CVI9) to ssize_t from CVI2009 onwards since CVI2009 introduced the possibility of building 64bit applications. sszie_t will translate to either 32 bit or 64 bit integers depending of the application you are building (32 bit vs. 64 bit).

So changing your fileSize parameter to ssize_t should solve your problem

[RobV]

thank you.