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checksum error, help!!!

Hi,everyone.

I am using a Databrowser to list files. Users are allowed to rename files by adding a kind of tag(i.e. myFileName.jpg ===> myFileName_REG.jpg). If only one file is selected in the Databrowser, it works fine. If two or more are selected, it crashes and says "checksum error,a freed object may be modified after released". I wonder if I am using CFStringRef object and CFMutableStringRef object rightly. Can anybody give me some suggestions?

Thanks in advance.


Here is the code:

int addTag(Str31 tagStr )

{

ControlRef browser = GetDataBrowserFromWindow(window);
UInt32 selectionCount;
DataBrowserItemID itemID;
CFRange rangeToReplace;
int i;

// get the number of the selected files
int selectionCount = ........;

// allocate memory
DataBrowserItemID *myItems = malloc(sizeof(DataBrowserItemID)*selectionCount);

// get the DataBrowser item id list
myItems = ......;

for(i = 0; i < selectionCount; i++)
{
// get a item id from the item list
itemID = ....... ;

// get the file name
Str255 fileName = .......;

CFStringRef nameString = CFStringCreateWithPascalString(kCFAllocatorDefault, fileName, kCFStringEncodingMacRoman);

CFMutableStringRef mutableNameString= CFStringCreateMutableCopy(kCFAllocatorDefault, 0, nameString );

CFRelease(nameString);

CFStringInsert(mutableNameString,CFStringGetLength(mutableNameString), tagStr);

CFStringGetPascalString(mutableNameString,fileName,sizeof(fileName),kCFStringEncodingMacRoman);

CFRelease(mutableNameString);

}

CFRelease(tagStr);

UpdateDataBrowserItems(browser,kDataBrowserNoItem,selectionCount,myItems, kFileColumn, kFileColumn);

free(myItems);


}
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