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Hi...I have some batch files that I want to execute upon the press of a button on my GUI. The batch files run some executables that setup parameters on another computer. At this point I cannot incorporate these executables into my GUI or change the executable in anyway. I want the console to remain hidden after the batch file has run, however I would like to display the console output to an edit box on my GUI. I have researched this a little bit and everything I find seems really complicated. Is there an easy way to pipe the console to my application? Or what options might I have? Thanks!
Clint Smith
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Hi,
I try to use variable=2^2 to get the answer 4. BUt actually do not work in MFC Visual C++.
Why?
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variable = 2*2;
---------------
Push down the front one
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Actually the what I want is power operation in math 2^2=4, 2^3=8. Not multiplication.
Can tell me how to do it for power operation? THanks.
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Yes, but 2^2 is equal to 2*2. I think this is what was being said.
Steve
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#include <math.h> and use pow. ie.
double val = pow(2, 2);
Steve
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exp is the wrong function. exp(x) is e^x. pow is the correct function to use.
Steve
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You're right. My mind isn't currently working.
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There is no exponentiation operator in C - ^ does a bitwise XOR. Use pow() instead.
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This one has confused the hell out of me.
I have a class which has a std::vector static member. From the c'tor I initialize this vector. The initialization is quite lengthy but can be shared amongst all instances hence the static.
When I later come to use the vector ( from the same instance ), it's empty! How could this be happening?
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Can you post some code?
Steve
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There's not really any code to post.
The instance is created in global scope, yet when I call one of the methods the vector is empty. If I create the instance within the same function as the call to the method, it's fine. So I'm guessing the problem relates to initializing a static member from the global scope.
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Put breakpoints on the vector initialisation code and method in question. Which one is hit first? I'd guess you're relying on the order of static initialisation.
Steve
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The class is created in global scope, the c'tor is called before main(), which initializes the static vector. Within main() I call a method which uses the initialized vector, only to find it empty. Breakpoints confirm that the vector is indeed initialized. So somewhere between the global scope c'tor and main() the vector is being set back to empty.
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The next thing to test is if the vector is ever filled. Perhaps there is a bug in the initialisation code. Put a call to std::vector::empty after the initialisation code and verify it actually gets filled. i.e.
assert(!s_MyVector.empty());
Steve
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Steven, forgive me for being blunt, but I would not post on the forum without first checking trivial things such as that. The vector is initialized. But when I come to use it it is not initialized.
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Even the best of us make stupid mistakes. I've done worse, and I'd wager so have you. Can you put together some minimal code which shows the problem? There's only so far you can go when the problems so abstract.
Steve
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hi,
I'm working with VS2005, and my project is in C++.
I want to do a treeview where root nodes are pictures and child nodes are normal (icon + texte)
I will be something like that :
<br />
[----root1picture----]<br />
...[ico] root1child1text<br />
...[ico] root1child2text<br />
[----root2picture----]<br />
...[ico] root2child1text<br />
my problem is when I put my root1picture in the root1 icon and no text for the root1, I have a huge indent value(because my root picture is long) for all the childs, and i'm not allowed to change it. I bet that is not a good solution to put my root's pictures in the root node icon with no text.
somebody know how could I do ?
thanks,
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I have a very simple DLL
dll header
__declspec(dllexport) int StartUp();
dll cpp
__declspec(dllexport) int StartUp()
{
return 42;
}
my console app
typedef int (*MYPROC)();
int _tmain(int argc, _TCHAR* argv[])
{
HMODULE c1 = LoadLibrary(L"client1.dll");
MYPROC ProcAdd = (MYPROC) GetProcAddress(c1, "StartUp");
int i = (ProcAdd)();
return 0;
}
GetProcAddress fails, returning NULL. (LoadLibrary suceed)
ANy ideas why?
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I would guess name mangling. Try making your code look like this:
extern "C" __declspec(dllexport) int StartUp();
Steve
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Thanks 
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To complement what Stephen said: in C++ you have the ability to overload a function (that is, provide the same name but different arguments type or a different number of argument). Thus, in that case, a function is identified not only by its name but also by its parameters.
In C, function overloading doesn't exist thus functions are identified only by their name.
This mechanism is used by the linker to identify the different functions, in C he will use only the function name and in C++ he will use the function name plus a 'description' of the parameter list.
So, if you declare that the function has a C linkage (by using the keyword extern "C"), you specify that the function use the C linkage, meaning that only its name is used to identify it. But that also mean that you won't be able to overload the function.
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For future reference, you can run dumpbin /exports or depends on the DLL to see exactly what the exported name is. In your case, your original code wasn't working because the function was exported as a C++ function and was given a decorated name by the compiler.
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