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Closed 9 years ago.
I am modifying some C++ code that has a wchar_t myArray[MAX_PATH] in the header file.
My modifications mean that I cannot know the length of this array until runtime. How can I store an array of dynamic length instead? Maybe I just keep a wchar_t* in the header file and another int to hold its length?
Use std::wstring instead. It's a dynamic string containing wchar_t.
Related
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Closed 9 years ago.
I gettin not declared in this scope error msg also declared .h file & EngineFactory class in .h
EngineFactory *engineFactory = NULL;
engineFactory = new EngineFactory();
EngineFactory->Create();
EngineFactory->destroy();
There is two problems in the code:
Your code is not inside a function. Place it in main() function, and it'll work better.
EngineFactory->Create(); has uppercase EngineFactory, while your variable is lowercase.
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Closed 9 years ago.
I am inserting 'this' pointer into a map
Does it cause a segmentation fault
My code is
client->commandHandlerMap.insert(std::pair<CommandType , CommandHandler*>(CommandType::OrderBookCommandType , this));
I am doing this inside the member function of a derived class of CommandHandler
I would assume that client is not initialized or has an invalid pointer.
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Closed 9 years ago.
Ogre::any_cast<std::map<Rail>::iterator>
It takes Ogre::any_cast<std::map<Rail> and says too few arguments etc. How can I fix it (other than obvious typedef aliasing)?
The problem is that std::map takes at least two template arguments - the key type and the value type. Currently you have std::map<Rail>. What are you mapping from Rail to? For example, this would be okay if your iterators are for a std::map that maps from Rail to int (assuming Rail is not a deduced type):
Ogre::any_cast<std::map<Rail,int>::iterator>(some_any_object)
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Closed 10 years ago.
I've seen a pretty strange (for me) usage of this method:
strncpy(somePointer,"%d",someInt);
What does this actually do? The integer specifier "%d" as the source is troublesome for me to understand.
It does what it says on the tin: It copies the literal string "%d" into a char buffer pointed to by somePointer, or at least the first someInt bytes of it (up to three).
Don't be upset by a percentage sign, it's just another character...
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Closed 11 years ago.
Somebody told me that this piece of code has some serious issues but I have not been able to get my head around such issues. Can you guys please educate me on this?
static char BASED_CODE szFilter[] = "HTML Files (*.xls)|*.xls|All Files (*.*)|*.*||";
const char* filter = "HTML Files (*.xlsx)|*.xlsx|All Files (*.*)|*.*||";
size_t length = strlen(filter);
strcpy_s(szFilter, length + 1, filter);
Well, the buffer overrun leaps out at me – szFilter isn't big enough to receive filter.
Why not use std::string since you are using C++? That makes these issues vanish.
The second parameter of strcpy_s() should be the size of the destination buffer; you've given it the size of the input string.
But as you're working in C++, you should avoid strcpy() (etc.) entirely, and use std::string.
szFilter is shorter than filter, so there is not enough place to copy filter to szFilter. You current code has undefined behaviour.