本文整理汇总了C++中NPT_String::UseChars方法的典型用法代码示例。如果您正苦于以下问题：C++ NPT_String::UseChars方法的具体用法？C++ NPT_String::UseChars怎么用？C++ NPT_String::UseChars使用的例子？那么, 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NPT_String的用法示例。
在下文中一共展示了NPT_String::UseChars方法的4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:
/*----------------------------------------------------------------------
| NPT_String::Format
+---------------------------------------------------------------------*/
NPT_String
NPT_String::Format(const char* format, ...)
{
NPT_String result;
NPT_Size buffer_size = NPT_STRING_FORMAT_BUFFER_DEFAULT_SIZE; // default value
va_list args;
for(;;) {
/* try to format (it might not fit) */
result.Reserve(buffer_size);
char* buffer = result.UseChars();
va_start(args, format);
int f_result = NPT_FormatStringVN(buffer, buffer_size, format, args);
va_end(args);
if (f_result >= (int)(buffer_size)) f_result = -1;
if (f_result >= 0) {
result.SetLength(f_result);
break;
}
/* the buffer was too small, try something bigger */
/* (we don't trust the return value of NPT_FormatStringVN */
/* for the actual size needed) */
buffer_size *= 2;
if (buffer_size > NPT_STRING_FORMAT_BUFFER_MAX_SIZE) break;
}
return result;
}示例2: while
/*----------------------------------------------------------------------
| AppendNumber
+---------------------------------------------------------------------*/
static void
AppendNumber(NPT_String& output, NPT_UInt32 number, unsigned int digit_count)
{
NPT_Size new_length = output.GetLength()+digit_count;
output.SetLength(new_length);
char* dest = output.UseChars()+new_length;
while (digit_count--) {
*--dest = '0'+(number%10);
number /= 10;
}
}示例3:
/*----------------------------------------------------------------------
| NPT_BufferedInputStream::ReadLine
+---------------------------------------------------------------------*/
NPT_Result
NPT_BufferedInputStream::ReadLine(NPT_String& line,
NPT_Size max_chars,
bool break_on_cr)
{
// clear the line
line.SetLength(0);
// reserve space for the chars
line.Reserve(max_chars);
// read the line
NPT_Size chars_read = 0;
NPT_CHECK_NOLOGTIMEOUT(ReadLine(line.UseChars(), max_chars, &chars_read, break_on_cr));
// adjust the length of the string object
line.SetLength(chars_read);
return NPT_SUCCESS;
}示例4: switch
/*----------------------------------------------------------------------
| NPT_DateTime::ToString
+---------------------------------------------------------------------*/
NPT_String
NPT_DateTime::ToString(Format format, NPT_Flags flags) const
{
NPT_String result;
if (NPT_FAILED(CheckDate(*this))) return result;
switch (format) {
case FORMAT_W3C:
AppendNumber(result, m_Year, 4);
result += '-';
AppendNumber(result, m_Month, 2);
result += '-';
AppendNumber(result, m_Day, 2);
result += 'T';
AppendNumber(result, m_Hours, 2);
result += ':';
AppendNumber(result, m_Minutes, 2);
result += ':';
AppendNumber(result, m_Seconds, 2);
if (flags & FLAG_EMIT_FRACTION) {
result += '.';
if (flags & FLAG_EXTENDED_PRECISION) {
// nanoseconds precision
AppendNumber(result, m_NanoSeconds, 9);
} else {
// only miliseconds precision
AppendNumber(result, m_NanoSeconds/1000000, 3);
}
}
if (m_TimeZone) {
NPT_UInt32 tz;
if (m_TimeZone > 0) {
result += '+';
tz = m_TimeZone;
} else {
result += '-';
tz = -m_TimeZone;
}
AppendNumber(result, tz/60, 2);
result += ':';
AppendNumber(result, tz%60, 2);
} else {
result += 'Z';
}
break;
case FORMAT_ANSI: {
// compute the number of days elapsed since 1900
NPT_UInt32 days = ElapsedDaysSince1900(*this);
// format the result
result.SetLength(24);
NPT_FormatString(result.UseChars(), result.GetLength()+1,
"%.3s %.3s%3d %.2d:%.2d:%.2d %d",
NPT_TIME_DAYS_SHORT[(days+1)%7],
NPT_TIME_MONTHS[m_Month-1],
m_Day,
m_Hours,
m_Minutes,
m_Seconds,
m_Year);
break;
}
case FORMAT_RFC_1036:
case FORMAT_RFC_1123: {
// compute the number of days elapsed since 1900
NPT_UInt32 days = ElapsedDaysSince1900(*this);
if (format == FORMAT_RFC_1036) {
result += NPT_TIME_DAYS_LONG[(days+1)%7];
result += ", ";
AppendNumber(result, m_Day, 2);
result += '-';
result += NPT_TIME_MONTHS[m_Month-1];
result += '-';
AppendNumber(result, m_Year%100, 2);
} else {
result += NPT_TIME_DAYS_SHORT[(days+1)%7];
result += ", ";
AppendNumber(result, m_Day, 2);
result += ' ';
result += NPT_TIME_MONTHS[m_Month-1];
result += ' ';
AppendNumber(result, m_Year, 4);
}
result += ' ';
AppendNumber(result, m_Hours, 2);
result += ':';
AppendNumber(result, m_Minutes, 2);
result += ':';
AppendNumber(result, m_Seconds, 2);
if (m_TimeZone) {
if (m_TimeZone > 0) {
result += " +";
AppendNumber(result, m_TimeZone/60, 2);
//.........这里部分代码省略.........