我有一个应用程序需要接受数百万个char *作为输入参数(通常字符串少于512个字符(在unicode中)),并将它们转换并存储为.net字符串.
它结果是我的应用程序性能的真正瓶颈.我想知道是否有一些设计模式或想法使其更有效.
有一个关键部分让我觉得它可以改进：有很多重复.假设有100万个对象进入,可能只有50个独特的char *模式.
为了记录,这里是我用于将char *转换为字符串的算法(此算法在C中,但项目的其余部分在C#中)
String ^StringTools::MbCharToStr ( const char *Source )
{
String ^str;
if( (Source == NULL) || (Source[0] == '\0') )
{
str = gcnew String("");
}
else
{
// Find the number of UTF-16 characters needed to hold the
// converted UTF-8 string,and allocate a buffer for them.
const size_t max_strsize = 2048;
int wstr_size = MultiByteToWideChar (CP_UTF8,0L,Source,-1,NULL,0);
if (wstr_size < max_strsize)
{
// Save the malloc/free overhead if it's a reasonable size.
// Plus,KJN was having fits with exceptions within exception logging due
// to a corrupted heap.
wchar_t wstr[max_strsize];
(void) MultiByteToWideChar (CP_UTF8,wstr,(int) wstr_size);
str = gcnew String (wstr);
}
else
{
wchar_t *wstr = (wchar_t *)calloc (wstr_size,sizeof(wchar_t));
if (wstr == NULL)
throw gcnew PCSException (__FILE__,__LINE__,PCS_INSUF_MEMORY,MSG_SEVERE);
// Convert the UTF-8 string into the UTF-16 buffer,construct the
// result String from the UTF-16 buffer,and then free the buffer.
(void) MultiByteToWideChar (CP_UTF8,(int) wstr_size);
str = gcnew String ( wstr );
free (wstr);
}
}
return str;
}
