Visual C++ :: Functions Were Discarded On Build Of DLL With 8.0
Dec 9, 2012
I want to build a dll library with visual c++ 8.0 and got an "unresolved symbol" linker error message when trying to use the library with an application. So I checked the dll library with dependency walker for the exported functions, the needed functions were missing in the library.
I then dumped the corresponding object file with dumpbin.exe, the function was declared as public, like the other exported functions. On the next step, I set the verbose switch for link.exe.
The verbose log told me, that the function was discarded on the linker run. What can lead to that behaviour of the visual c++ linker ?
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Nov 26, 2014
It compiles fine but hangs during linking. The last message I got is
Code generation.
Sometime when I cancel it, I got
LNK1257 code generation failed
What can be possible reasons and how to diagnose?
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Dec 1, 2014
Debug build links fine but release build linking hangs at "code generation"
If I turn off whole optimization, it actually works fine, but I do need whole optimization.
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Feb 10, 2013
I have Mq4 platform calling functions from DLL some how it doesnt make any differents when I make the call....
// DLL Code
#define WIN32_LEAN_AND_MEAN
#define MT4_EXPFUNC __declspec(dllexport)
using namespace std;
std::string My_String;
#define stringify(mymonths ) # mymonths
[Code] ....
I call this function
bool counts = StartRulls(bars);
Print("counts =",counts );
2013.02.09 23:03:242010.03.31 16:37 My_Mq4.mq4 EURCAD,M5: counts = 1
My result always stays 1
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Aug 27, 2014
I write a DLL MyDLL.dll with Visual C++ 2008, as follows:
(1)MFC static linked
(2)Using multi-thread runtime library.
In the DLL, this is a global data m_Data shared by two export functions, as follows:
ULONGLONG WINAPI MyFun1(LPVOID *lpCallbackFun1) {
...
Write m_Data(using Critical section to protect)
[Code]....
Although MyThread1 and MyThread2 using critical section to protect the shared data m_Data, I will still suspend MyThread1 before accessing the shared data, to prevent any possible conflicts.
The problem is:
(1)When the first invoke of MyFun2, everything is OK, and the return value of MyFun2(that is nResult2) is 1 , which is expected.
(2)When the second, third and fourth invoke of MyFun2, the operations in MyFun2 are executed successfully, but the return value of MyFun2(that is nResult2) is a random value instead of the expected value 1. I try to using Debug to trace into MyFun2, and confirm that the last return statement is just return a value of 1, but the invoker will receive a random value instead of 1 when inspecting nResult2.
(3)After the fourth invoke of MyFun2 and return back to the next statement follow MyFun2, I will always get a "buffer overrun detected" error, whatever the next statement is.
I think this looks like a stack corruption, so try to make some tests:
1.I confirm the /GS (Stack security check) feature in the compiler is ON.
2.If MyFun2 is invoked after MyFun1 in MyThread1 is completed, then everything will be OK.
3.In debug mode, the codeline in MyFun2 that reads the shared data m_Data will not cause any errors or exceptions. Neither will the codeline in MyFun1 that writes the shared Data.
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Jan 24, 2013
Code:
class Editor {
// c'tors etc
Gtk::EventBox canvas_event_box;
void functionA();
void functionB() const;
[Code] ....
When I try to compile functionB in Visual C++ it gives me this error:-
glibmm/refptr.h(199) : error C2440: 'initializing' : cannot convert from 'const Gdk::Window *' to 'Gdk::Window *'
Conversion loses qualifiers
And this is the code from glibmm/refptr.h
Code:
// The templated ctor allows copy construction from any object that's castable. Thus, it does downcasts:
// base_ref = derived_ref
template <class T_CppObject>
template <class T_CastFrom>
[Code] .....
I don't actually want to change anything in the member variable canvas_event_box. I just want to be able to call one of its functions from my 'const' member function. Is there any syntax I can use to tell VC++ that I'm not actually changing the variable - just using it.
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Apr 8, 2013
I am doing an project in SDI. I have two functions name sendtext(CString str) and displaytext(CString inr) both in different class. I have a pointer name pView to send the string str to function "displaytext". The problem is after some operations i get a text in str and i send that text to display text in the output screen i get the text and wen the second text comes to "displaytext" the former text disappears and the latest string only present. How can i display both the text in the output window on ClistCtrl class.
Code:
Void sendtext(CString str)
{
// do some operations
................
pView->displaytext(str);
}
void displaytext(CString inr) {
CListCtrl &ctlsde = this->GetListCtrl();
ctlsde.InsertColumn(1, _T("First "), LVCFMT_LEFT, 80);
int nItem;
nItem = ctlsde.InsertItem(0, inr);
}
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May 13, 2013
What is the programmers responsibility with respect to const char * returned by various functions, like the C++ string class c_str() function which returns a const char * to an c style string array? In VC++ I cannot delete a const char * which holds a string literal. Take the following code for example:
Code:
void func() //a useless function with illustrative code {
string s1("abcd");
string s2("efgh");
const char * cc1 = s1.c_str(); //c_str() returns a const char * c style string pointer
s2.c_str(); //this returns a const char *, which must be allocated on the heap right?
delete cc1; //produces run time error in Release mode in VC++
}
The problem with the above code snip is that space is allocated on the heap (or so I believe) for the const char *'s returned by the 2 calls to c_str(). The delete attempt fails and there is no opportunity to delete the space allocated by const char * because its not assigned to anything (however I see c_str() used this way extensively)
So, if I cannot delete a const char *, how does the memory get recovered? Perhaps the string objects s1 and s2 themselves have pointers to the items on the heap made by c_str() calls and they get deleted by the destructors of s1 and s2 when the function ends?
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Nov 20, 2012
Working in Win32 console app (VS 2010) I have been trying to convert several Unicode (UTF-16) C++ functions to Ansi C (UTF-8). The test app includes two tokenizer classes, each of which work perfectly well in their respective environments, CTokA and CTokW (UTF-8 and UTF-16).
A problem arises when I attempt to run the UTF-8 functions when the Character Set properties is set to 'Use Unicode Character Set' in that std::string manipulations do not perform as expected, e.g.,
printf("start
");
gets reproduced as
printf("start
");══════════ ²²²²
Attempting to null terminate the string where it is supposed to end simply results in a space in that position and the garbage end persists, e.g.,
printf("sta t
");══════════ ²²²²
Code:
sline[11] = 0x0000;
If I attempt to change the Character Set property to 'Use Multibyte Character Set' or 'Not Set', the app will not compile and hundreds of errors occur. Of course, I can eliminate all of the UTF-16 code, but it strikes me that it should not be necessary. Perhaps if M$ made everything UTF-16 without all of the necessary decorations like 'L' and '_T(', life would be much simpler. Unfortunately, I have a very extensive UTF-8 app under 10 years of development that works quite well, but my UTF-16 (Unicode) conversion doesnt work as well because of the mixing of pointers (I think), so I have had to revert much of the code back to UTF-8. (All of which has nothing to do with my question but is simply psychotheraputic for me to ventilate on.)
My question is this: Can UTF-8 and UTF-16 code coexist in a single Win32 console app?
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Feb 7, 2014
I'm trying to write a custom allocator that I can use with the STL. Here's what I have so far :
Code:
#include <cstddef>
#include <iostream>
#include <memory>
#include <vector>
template<class T>
struct customallocator {
[Code].....
I'm doing and currently, my push_back doesn't seem to do anything.
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Sep 11, 2014
How to build the static library on my own using visual C++ 2008.
I used the following code to create the header file and cpp of the library.but I am unable to compile due to the following error.
// MathFuncsLib.h
namespace MathFuncs {
class MyMathFuncs {
public:
// Returns a + b
static double Add(double a, double b);
[Code] .....
Error I get while it is compiled :
Error3error C2653: 'MyMathFuncs' : is not a class or namespace name
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Sep 28, 2013
class test {
private:
string name="";
public:
event void changedname();
void setname(string value)
[code]....
i get error about 'a' and 'b' not be a class. but using a template can i validate these code?
my problem is that i don't know how to use objects outside of functions / these is polymorphism, but not accepted by C++
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Apr 6, 2014
I need to build an array in a function and return that array. Well, two arrays actually, which means I can't return it in the return statement.
Long term, this function/method is supposed to return two populated buffers for further processing. The buffers/arrays are loaded from a file. So, the size of the array is completely unknown until after the file is read. So, you can't have a fixed size array until the function is almost ready to return.
I'm hardcoding the arrays here for testing purposes, but eventually they will be loaded in from a file. That's the whole purpose of this.
Anyway, I need to pass the arrays that are created in this function/method to the caller. But I can't figure out how to do it. The code "almost" works, except that it's overwriting my array when it returns.
Here's the method:
bool GameModelClass::LoadBuffersFromPUNCFile(std::wstring PUNCFileName, VERTEX* &VertexListPointer, unsigned int* &IndexListPointer) {
VERTEX GroundVertexList[4] = {
[Code]....
VertexListPointer returns the correct data structure (actually its an array of structures). The problem is that the first time I use the other variables it over rights the array. The pointer still points to the same spot, but VertexBufferDescription is next to the VertexListPointer and so completely overwrites it.
What I "think" I want is to allocate the array in a totally different area of memory. VertexListPointer should be a pointer, not a contiguous block of memory. It should point to the contiguous block of memory elsewhere.
This is where my weak understanding of pointers comes back to bite me in the posterior end.
In the end, I just want to pass back two arrays/buffers to be used by the calling code.
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Feb 22, 2015
I'm having trouble finishing this program. What I'm trying to do is create a class for Rational numbers. Get input from user for denominator and numerator. Store the numbers without a sign, and for the sign store it separately in char. I'm not supposed to use accessor functions. The part that I can't seem to know how to do is use the info that was stored in the addUp function. This function need to add two rational numbers. i need to make this function general enough that it can handle two fractions, or a fraction and a whole number, or two whole numbers. What I already have here is readin function which reads in the numerator and denominator. setnumerator and setdenominator to assign positive values. setsign should get the sign of the fraction. Finally addUp should addUp which I explained before. I have some ideas about writing the tests, but can't seem to know how to implement it to the program. The main program is still empty but all I'm supposed to do there is call the class functions.
Code:
#include <iostream>
using namespace std;
class Rational {
private:
int numerator, denominator;
char sign;
[Code] .....
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Dec 31, 2012
I want to know how to list the all the symbols in the shared library(dll or .so file). I dont want commands like nm or objdump or depends.exe . I want to get the list of functions available in shared library programmatically at runtime (after calling loadlibrary/dlopen and GetProcAddress/dlsym). Is there a way to get the complete signature of functions in a shared library?
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May 6, 2013
I have main thread that creates an WebBrowser2 COM object. and i want to invoke JScript functions on it from another thread. i try to use GIT but still doesn't work for me.. there is a problem with marshal WebBrowser2 for JScript?
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Dec 29, 2013
I am not sure how to build the tree with values:
Code:
struct Node *root = 1 root->left = 2
root->right = 3
root->left->left = 4;
root->left->right = 5;
Everything should be right except the main(). How to demonstrate this program correctly?
Code:
#include <iostream>
#include<stdio.h>
#include<stdlib.h>
#include <stack> // std::stack
[Code] .....
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Jul 10, 2013
10,11,20,1512,22,24,19,22
i want to write a c++ program to build min heap which gets above values from user. remember this program should not alloduplicate values to enter. it should discard duplicate values.
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Jul 18, 2013
i have four email adresses (for various reasons) and i could probably find a client for all three on source forge, but i thought it would be good practice to use my own. i want to use boost, sdl, and c++, but i cant find a tutorial.
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Sep 27, 2013
I have lot of C++ API exposed in our project and I want to build an application that queries the database and shows some stuff to the user in the UI.
So, essentially, my main code is in the c++ language. What choices do I have over the UI?. I am interested in showing this UI in the form of a html page lilstening to a port.
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Jul 1, 2014
Build a class named "salesCompany". Save it's name with a string and an array with records which will be filled with values from sales in different cities of the company.
Build the constructor which must get as a parameter the name of the company and a text file which will fill the array. There is an example of the text file format. Every line saves the sold quantity of a product, identified by a code, in a certain city.
CodeCityQuantity
1a63bCity11200
45ab8City2550
#include <iostream>
#include <string.h>
using namespace std;
class salesCompany {
[code].....
what should I add more and how can make it available for the user to enter as an input a text file.
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May 4, 2013
How can we build unit-tests for functions of libraries, those with user-defined types used as their arguments ?
For example
CRecord func(Myclass * class, BSTR * name, CComptr<xxx> & something);
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Apr 5, 2014
After compiling, I cannot understand why my getMost and getLeast functions are returning erroneous values. I've done everything I could think of to try and fix this, Problem and code below.
A local zoo wants to keep track of how many pounds of food each of its three monkeys eats each day during a typical week. Write a program that stores this information in a twodimensional 3 * 7 array, where each row represents a different monkey and each column represents a different day of the week. The program should rst have the user input the data for each monkey. Then it should create a report that includes the following information:
* Average amount of food eaten per day by the whole family of monkeys.
* The least amount of food eaten during the week by any one monkey.
* The greatest amount of food eaten during the week by any one monkey.
Input Validation: Do not accept negative numbers for pounds of food eaten.
Code:
#include <iostream>
#include <iomanip>
#include <iostream>
#include <string>
using namespace std;
// Constants.
const int NUM_MONKEYS = 3;
const int NUM_DAYS = 7;
[Code] ....
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Apr 5, 2013
I'm trying to build a Linux Process Scheduler from scratch but dont know where to start.
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Nov 26, 2012
I am trying to build a web application that uses p/invoke to access a method. Similiar to the one used here - [URL] However I keep getting the following error message - Unable to load DLL 'MyDll.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E) I read say to change the output directory to match that of the Mydll directory I have tried that and it still does not work.
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Dec 28, 2011
I have a project C# and i want to build it to .dll for use in ASP.Net project . Any way to do it. It look like my attachments image .
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