Summary
The NS_StringSetDataRange
function copies data into a section of the string's internal buffer. This is a low-level API.
#include "nsStringAPI.h" nsresult NS_StringSetDataRange( nsAString& aString, PRUint32 aCutStart, PRUint32 aCutLength, const PRUnichar* aData, PRUint32 aDataLength = PR_UINT32_MAX );
Parameters
- aString
- [in] A nsAString instance to modify.
- aCutStart
- [in] The starting index of the section to replace, measured in storage units.
- aCutLength
- [in] The length of the section to replace, measured in storage units.
- aData
- [in] A raw character array to copy into this string.
- aDataLength
- [in] The length of aData, measured in storage units. If equal to PR_UINT32_MAX, then aData is assumed to be null-terminated. Otherwise, aData need not be null terminated.
Return Values
The NS_StringSetDataRange
function returns NS_OK if successful. Otherwise, it returns an error code.
Example Code
// Replace all occurances of |matchVal| with |newVal| void ReplaceSubstring(nsAString& str, const nsAString& matchVal, const nsAString& newVal) { const PRUnichar* sp, *mp, *np; PRUint32 sl, ml, nl; sl = NS_StringGetData(str, &sp); ml = NS_StringGetData(matchVal, &mp); nl = NS_StringGetData(newVal, &np); for (const PRUnichar* iter = sp; iter <= sp + sl - ml; ++iter) { if (memcmp(iter, mp, ml) == 0) { PRUint32 offset = iter - sp; NS_StringSetDataRange(str, offset, ml, np, nl); sl = NS_StringGetData(str, &sp); iter = sp + offset + nl - 1; } } }
History
This function was frozen for Mozilla 1.7. See bug 239123 for details.