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Hi,
I am developing serial port communication but i have a problem
while sending and receiving at the same time from the serial port.
how to do the synchronization while sending and receving
data from the serial port.
I have a recevie thread (infinite loop thread )
whenever data is coming from that thread i will update that thread.
When sending from the same port its giving problem.?
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there isn't sufficient information here to offer any real help. Except for this:
When software handshaking is not used (i.e. there is no handshaking at all, or handshaking is handled through hardware lines), then sending and receiving are completely separate operations that do not interfere with each other (except probably at the functional level of your peripheral, which upon receiving a command is likely to send a response).
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Is it possible to export a static function in an exe using "declspec(dllexport)"?
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in order to be exported or imported from a dll/exe, a function should have external linkage. When we declare a function, by default it gets extern storage. but a static function doesn't gets external linkage so declaring it as __declspec(..) will give error.
Also no way to use more than one storage specifiers at declaration.
modified on Friday, August 13, 2010 10:02 AM
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This is a contradiction. You cannot export a something which is explicitely declared to be local (static).
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Hi,
Im using LoadLibrary function to load a dll.To call a function,we will use GetProcAddress.But how to assign a value to a variable in that dll. Can anyone pls help me?
Thanks,
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Maybe this would help:
#pragma data_seg (".commondata")
extern =
#pragma data_seg ()
For more information, look here[^].
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The documentation[^] says:
GetProcAddress Function
Retrieves the address of an exported function or variable from the specified dynamic-link library (DLL).
...
So you probnably can access exported variables the same way as functions.
> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> "It doesn't work, fix it" does not qualify as a bug report. <
> Amazing what new features none of the programmers working on the project ever heard of you can learn about when reading what the marketing guys wrote about it. <
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Why don't you define an accessor function in the DLL?
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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The dll is given by some vendor. Just im using that one. I cant define functions in dll.
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OK.
As side note, it is really strange that the vendor exposes a DLL's variable.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
[My articles]
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After linking C++ project with specific .libs and when I run it, how does a system find the corresponding DLLs if they are not in the same directory?
There should be some rules for that, as far as I know.
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I believe the answer is right here[^] in a document titled Dynamic-Link Library Search Order.
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Thank you. I have been looking precisely for this.
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Most of the search rules are explained here[^].
Chris Meech
I am Canadian. [heard in a local bar]
In theory there is no difference between theory and practice. In practice there is. [Yogi Berra]
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I am writing a function pointer for a static member function and i am getting a C 2159 : ore than one storage class specified.
typedef static A* (*CreateInstance)();
When i build i get the error . Please let me know what i am doing wrong!!!!
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The static declarator is not allowed on a typedef, your declaration should read:
typedef A* (*CreateInstance)();
It's time for a new signature.
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You cannot use typedef and static that way. "static" defines a storage type for an instance (of whatever) and is not related to the type itself.
By
typedef A* (*CreateInstance)();
you have defined a type alias for a type "function taking no parameters and returning pointer to A". The name of the alias is CreateInstance and it is compatible with anything which satisfies this type definition. You can use your new alias as follows:
class AProvider {
public:
static A* Create() {
return new A();
}
};
A* StandAloneCreate() {
return new A();
}
...
CreateInstance Creator1 = StandaloneCreate;
CreateInstance Creator2 = AProvider::Create;
A* tA1Instance = Creator1();
A* tA2Instance = Creator2();
...
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Hi!
I've an array of strings called playerLst.It has many single space strings(e.g "SR Tendulkar"),three two space strings(e.g "AB de villiers") and one three space string(e.g "RE van der Merwe"). I've to split the strings into parts by the space as delimeter. I've split it like this:
vector<stringc> players;
for(int j = 0; j<playerLst.size(); j++)
{
playerLst[j].split(players, " ",1);
}
Now the vector "players" has strings split by the space. I've printed and verified this. I've to rearrange the last part in every string in the vector. The following code works correct for strings which contain single space in them.
array<stringc> nameFirstPart,nameSecondPart;
for(int i = 0; i<players.size(); i++)
{
srand(t);
nameSecondPart.push_back(swapChars(players[++i]).c_str());
t++;
}
What modification has to be done in the function call, to rearrange the last part of every string in the vector?
Also I've to re stitch the rearranged string to the first part if the string originally has two parts(e.g "SR Tendulkar"), second part if it has three parts(e.g "AB de villiers") and third part if it has four parts(e.g "RE van der Merwe"). How to do this?
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I will give you an answer here that is maybe not what you are looking for, but nevertheless I think important.
You have been asking roughly the same thing I don't know how many times by now, and you still have issues with your code. I think you need to step back and try to understand the fundamentals.
One way to get a grasp of what you are doing is to use (named) temporary variables. Try to break down your statements into smaller pieces, and store intermediate results. Be careful when naming things.
Most importantly, if you put your mind into solving each of your microproblems yourself, you will learn a lot more, and ultimately become a better programmer. In some respect, the easy access to a community like this can make you less productive in the long run.
I hope you find the solution to your problem, or that someone helps you. Good luck!
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I would echo Niklas's good advice. I have been watching these questions for some time and it seems to me you are trying to write rather more complex code without the understanding of some of the basics. The problem you are trying to solve here with strings is really a fairly simple one; or it would be if you spent some time looking at the STL classes and string[^] in particular. I will also give you a hint, in this question the only item you really need to split out is the very last portion, regardless of how many items precede it.
It's time for a new signature.
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Hi All,
I am exporting set of functions from an exe using DLLExport , and i want to call these in another dll . Can you please tell me what i need to do in the place where i am calling them..
Thanks,
Hari
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Include the header file that contains the function declarations of the exported functions.
This header usually has the __declspec(dllimport) statement, either as it is or hidden behind a macro.
Add the name of the LIB file corresponding to the DLL in Project -> Properties -> Configuration Properties -> Linker -> Input -> Additional Dependencies.
This is one way of doing it.
Another way is to call LoadLibrary on the DLL and then use GetProcAddress to load the exported function address to call.
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the LoadLibrary and GetProcAddress way has the advantage that the start of the calling dll always is working and you can check the for failures.
Press F1 for help or google it.
Greetings from Germany
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