vC++ 实现ASP.NET string.Format

int FormatString(char* buffer,int buflen,char* format,...)
{
    va_list args;

    va_start(args, format);

    int len = _vsnprintf(buffer, buflen, format, args);

    va_end(args);

    return len;
}

调用方式

	char buffer[512];

	FormatString(buffer,sizeof(buffer),"{\"key\":\"%d\"}",1);

	printf(buffer);