本文整理汇总了C++中nsAString::GetMutableData方法的典型用法代码示例。如果您正苦于以下问题：C++ nsAString::GetMutableData方法的具体用法？C++ nsAString::GetMutableData怎么用？C++ nsAString::GetMutableData使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类nsAString的用法示例。
在下文中一共展示了nsAString::GetMutableData方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: SHGetPathFromIDListW
static nsresult
GetShellFolderPath(int folder, nsAString& _retval)
{
wchar_t* buf;
uint32_t bufLength = _retval.GetMutableData(&buf, MAXPATHLEN + 3);
NS_ENSURE_TRUE(bufLength >= (MAXPATHLEN + 3), NS_ERROR_OUT_OF_MEMORY);
nsresult rv = NS_OK;
LPITEMIDLIST pItemIDList = nullptr;
if (SUCCEEDED(SHGetSpecialFolderLocation(nullptr, folder, &pItemIDList)) &&
SHGetPathFromIDListW(pItemIDList, buf)) {
// We're going to use wcslen (wcsnlen not available in msvc7.1) so make
// sure to null terminate.
buf[bufLength - 1] = L'\0';
_retval.SetLength(wcslen(buf));
} else {
_retval.SetLength(0);
rv = NS_ERROR_NOT_AVAILABLE;
}
CoTaskMemFree(pItemIDList);
return rv;
}示例2: return
// Like GetMutableData, but returns false if it can't
// allocate enough memory (e.g. due to OOM) rather than
// returning zero (which could have other meanings) and
// throws away the out-param pointer.
bool
SetLengthForWriting(nsAString& aDest, PRUint32 aDesiredLength)
{
PRUnichar* dummy;
PRUint32 len = aDest.GetMutableData(&dummy, aDesiredLength);
return (len >= aDesiredLength);
}示例3: defined
static nsresult
GetShellFolderPath(int folder, nsAString& _retval)
{
PRUnichar* buf;
PRUint32 bufLength = _retval.GetMutableData(&buf, MAXPATHLEN + 3);
NS_ENSURE_TRUE(bufLength >= (MAXPATHLEN + 3), NS_ERROR_OUT_OF_MEMORY);
nsresult rv = NS_OK;
#if defined(WINCE) && !defined(WINCE_WINDOWS_MOBILE)
if (folder == CSIDL_APPDATA || folder == CSIDL_LOCAL_APPDATA)
folder = CSIDL_PROFILE;
BOOL ok = SHGetSpecialFolderPath(NULL, buf, folder, true);
if (!ok) {
_retval.SetLength(0);
return NS_ERROR_FAILURE;
}
buf[bufLength - 1] = L'\0';
_retval.SetLength(wcslen(buf));
// sometimes CSIDL_PROFILE shows up without a root slash
if (folder == CSIDL_PROFILE && buf[0] != '\\') {
_retval.Insert('\\', 0);
}
#else
LPITEMIDLIST pItemIDList = NULL;
if (SUCCEEDED(SHGetSpecialFolderLocation(NULL, folder, &pItemIDList)) &&
SHGetPathFromIDListW(pItemIDList, buf)) {
// We're going to use wcslen (wcsnlen not available in msvc7.1) so make
// sure to null terminate.
buf[bufLength - 1] = L'\0';
_retval.SetLength(wcslen(buf));
} else {
_retval.SetLength(0);
rv = NS_ERROR_NOT_AVAILABLE;
}
CoTaskMemFree(pItemIDList);
#endif
return rv;
}