C++ :: Calling A Function Of A Library

Apr 6, 2012

I have a code like this below in /root_project/main.cpp:

Code:
#include "theoraplayer/TheoraVideoClip.h"
unsigned int tex_id;
TheoraVideoManager* mgr;
TheoraVideoClip* clip;
std::string window_name="glut_player";
bool started=1;

[Code] ....

and the TheoraVideoClip.h file is in /root_project/include/theoraplayer/.

Inside of TheoraVideoClip.h there is this:

Code: TheoraVideoFrame* getNextFrame();

And when I try to compile using g++ -o app main.cpp -lGL -lglut -lGLU -ltheora -ltheoradec -ltheoraenc I'm gettin this error:

main.cpp.text+0xac2): undefined reference to `TheoraVideoClip::getNextFrame()'

Ubuntu 11.10

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C++ :: Calling Library From HTML Page

Jun 12, 2014

I would like to be able to call c++ library from HTML page. So on HTML page I have area for some possible input (url, name, email, etc) and that info is passed to c++ and calculated info and may email someone; or pull info from text file and display on html page. Realizing PHP or something similar would be easier, I really want to make these calls from HTML pages. ???

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C++ :: Shared Library Export And Calling Convention?

Aug 13, 2013

I want to create a simple shared library that exports a simple C API, just like llvm-clang.

The library should be compilable with any compiler and be used by a variety of languages, again just like clang.

For visual studio that is:

Code:
extern "C" __declspec(dllexport) void __cdecl myfunc(int arg);

The __cdecl is the issue here: i cannot seem to find a compiler agnostic way of specifying the use of cdecl.

So i went to see how my favorite C API libraries (ie clang) handle it.

none of them specify a calling convention at all!

Code:
#define CINDEX_LINKAGE __declspec(dllexport)
CINDEX_LINKAGE void clang_disposeIndex(CXIndex index); //exported

how does that work? How does the compiler know to use __cdecl and how would i link to it dynamically without that knowledge?

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Visual C++ :: Error C3867 Function Call Missing Argument List For Calling Thread Function

Mar 19, 2013

I searched the web for error: C3867... and the discussions where murky or obscure.

My code excerpt is:

#pragma once
#include <windows.h>
#include <stdlib.h>
#include <process.h>
void PutUpfrmIO(void *);
namespace WordParsor {

[Code] .....

I get the generic message:

error C3867: 'WordParsor::Form1::PutUpfrmIO': function call missing argument list; use '&WordParsor::Form1::PutUpfrmIO' to create a pointer to memberc:userskingc++wordparsorwordparsorForm1.h... and the suggestion fix generate another error.

One person suggested the gcroot<> object wrapper... but I do not know how to modify/declair the function or its argument type.

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C :: Main Function Does Not Return Any Values When Calling Other Function?

Jun 9, 2013

The function is supposed to return value from the file in my main, but I am getting empty value. I am trying to get better with pointer. Right now just teaching myself.

right now the only way for this code to show value is when in put the putchar(*ps) inside my readfile function. I would like to readfile to return value and print in the main function.

Code:

#include <stdio.h>
char *readfile(char filename[]);
int main(int argc, char *argv[] ) {

[Code].....

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C++ :: Calling Base Function From Derived Overloaded Function

Nov 10, 2014

Here is a sample of my question

class Base{
public:
int getNum();
private:
int numToGet;
}
class Derived: public Base {
public:
friend ostream& operator<<(ostream& output, const Derived &B);

[Code]...

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C++ :: Calling Function By Sending Char Text Of Function Name

Feb 19, 2014

Is this possible?

int myfunc( int a, int b, char * c )
char a = "(int)myfunc()";
char b = "(int,int,char*)"
call(a, b, ...) // Function name and return type, params

I want to do function what registers forward what will get callback if the time is right. Basically then i dont need to edit and add extra functions into source files. I just have to include header and use register forward function. If there is anything close to this it would be perfect!

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C++ :: Calling Function In DLL

Jun 8, 2014

I have this sample code, that calls a function in a DLL. The function Callback is provided to the DLL as an argument, in order for the DLL to notify my program of relevant changes.

sample:

#include <iostream>
#include <conio.h>
#include <windows.h>
#include <winbase.h>
#include "TcAdsDef.h"
#include "TcAdsApi.h"
 using namespace std;
 void _stdcall Callback(AmsAddr*, AdsNotificationHeader*, unsigned long);
 
[Code] ....

I would like to change this code, so that there is a Main class that opens the connection and there are several separate classes (as below) that register themselves for a specific variable and get notifications if that value is changed. The reason for this is that I want to get several notifications for several independent events and I don't want them to mix. I figured this should look something like this:

class.h
#ifndef INACLASS_H
#define INACLASS_H
 #include "Main.h"
 class InAClass {
    public:
        InAClass(Main* mainClass, std::string iolocation);

[Code] ....

Unfortunately this gives me an error:
error: cannot convert 'InAClass::Callback' from type 'void (InAClass::)(AmsAddr*, AdsNotificationHeader*, long unsigned int)' to type 'PAdsNotificationFuncEx {aka void (__attribute__((__stdcall__)) *)(AmsAddr*, AdsNotificationHeader*, long unsigned int)}'

At first I thought this was because I don't have the namespace "using namespace std;" on top, but then I should be able to find something that specifically needs to come from the std namespace and is not marked as such. I don't want to rule the option out, but so far I could not find anything like that.

An alternative explanation might be that the Callback function needs to be global, but if I make it global, how can I distinguish between several Callback functions?

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C++ :: Calling Char From Function

Aug 3, 2013

Every time I try to use the function SaveNewCD, it doesn't write to file correctly. It writes the ~, three characters, then goes into an infinite loop.

#include<iostream>
#include<fstream>
using namespace std;
int SaveNewCD();
int OpenCD();
int main() {
char ArtistName[25];

[Code] .....

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C++ :: Calling A Function Through A Variable?

Jul 2, 2014

I am trying to call a function through a variable

The error

|error: no match for 'operator=' (operand types are 'std::string {aka std::basic_string<char>}' and 'void')|

|warning: statement has no effect [-Wunused-value]|
||=== Build failed: 1 error(s), 1 warning(s) (0 minute(s), 0 second(s)) ===|
#include <iostream>
#include <fstream>

[Code].....

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Apr 3, 2013

I am trying to use ofstream to write in a txt file in a function called recurrently. for a simplified example:

void func_write(double x) {
ofstream myfile;
myfile << "the result = " << x << endl;
} int main() {
ofstream myfile;

[Code] .....

To this stage, it does not work, because the myfile in func_write cannot write in the txt file opened in main function. I don't want to open, append and close the txt file each time the function is called, that will take more time to execute all (imagine with 500 calls).

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Dec 28, 2013

I want to call the array from one function to another all function not a main function

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C++ :: Calling A String In One Function Into A New Function

Oct 24, 2013

How would I call a string that sits within a switch loop in the main function, into a separate function?

Like this:

void statistics() {
cout << "Here are the statistics for your entry: " << endl;
cout << "
The size of your entry is " << s.length() << " characters." << endl;
}

I am calling string s from this:

switch (toupper(myChoice)) {
case 'A': cin.ignore();
cout <<"
Please enter your text: ";
getline(cin, s);

[Code] ....

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C++ :: Calling Another Function Within A Function Not Working

Feb 20, 2013

I have two functions bool check_key(string cKey, string eKey) and bool check_digit(char digit1, char digit2), and I have declared both of them globally (is this the right terminology?) right after the "using namespace std;" and right before the "int main(){".

In the first one, I called the second one . But it is giving me the error: "no match for call to `(std::string) (int&)' ".

Code:
bool check_key(string cKey, string eKey) {
if(cKey!="" && eKey=="") return false;
if(cKey=="" && eKey=="") return true;
if(cKey=="" && eKey!="") return true;
if(cKey.length()!= eKey.length()) return false;
bool flag=true;

[Code] ....

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Sep 12, 2013

I'm new to C/C++. I'm trying to make a program that's going to use the CBLAS libraries that I downloaded on BLAS. After fighting tooth and nail with VC 2005 (I downgraded on purpose because at one point I was desperate.) with regards to solving compilation errors and such and eventually it all compiled just fine.

The problem now is, I get the above mentioned error. It says: "Unhandled exception at 0x0040271c in Try.exe: 0xC0000005: Access violation reading location 0x4e18feb8."

Now there are a few .cpp files (I'm compiling as C code.) which contain the functions and there is one other one which contains my main method. Using the debugger, it goes through 3 files all in all.

The main file: Code: /* cblas_example2.c */

#include <stdio.h>
#include <stdlib.h>
#include "cblas.h"
#include "cblas_f77.h"

[Code] .....

I get the above-mentioned exception in the last line, or:

Code: cblas_dgemm( UNDEFINED, transa, transb, *m, *n, *k, *alpha, a, *lda, b, *ldb, *beta, c, *ldc );

The debugger tells me what the address in the exception is the address if *ldc.

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Dec 19, 2013

Expected output: 20

But what I got is: 22

Why. While calling sub function it should take the global variable am I right

insert Code:
#include <iostream>
using namespace std;
int a=0;
void sub()

[Code] ....

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Mar 7, 2014

Code:
const MenuData breakfast[NUMOFBREAKFASTITEMS] = {
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{"Pancake Breakfast", "Three Buttermilk pancakes served with butter and syrup.", "", "Three Pancakes, Butter, Syrup", "", 200.00},

[Code]....

What I'm trying to do is call the printReceipt function in the main, but I'm doing it wrong. Here is my attempt.

Code:
printReceipt (const MenuData menu[], qty, info)

I've tried it many other ways but I keep getting an error. I tried researching it on the internet, but I don't get much info.

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Aug 17, 2013

I have i want to call a function with two results for example x = 1 and y = 2.How do i return this function in c and how do i call such a function in the main program.

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May 29, 2014

Suppose I have the following function containing while loop:

#include <iostream>
using namespace std;
int Loop () {

[Code]....

here in above code I want to return value of 'a' by calling function 'Loop'. Is there any way to do this??

for above code output should be:

value of a: 10
value of a: 11
value of a: 12
value of a: 13
value of a: 14
value of a: 15
value of a: 16
value of a: 17
value of a: 18
value of a: 19

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Nov 2, 2013

I've been trying to get my program to call void functions with an if statement, but when i run my program and try to call one of the functions "worst case, best case, or random case" it doesn't get called. It just prompts the original menu.

#include<iostream>
#include<fstream>
using namespace std;
void bubbleSort();
void selectionSort();

[Code] .....

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Dec 29, 2012

I'm trying to call a function on a derived class that's in a vector of it's base class. I've made the code really simple for illustration purposes:

class Sprite {
virtual void update();
}
class Enemy : public Sprite {
virtual void update();

[Code] ....

I want to be able to just call update() on the items in the vector and the derived class update() functions be called. Currently, it always calls the Sprite update, which makes sense, but it's not what I want. Is there a way to call the derived update function without knowing the type of the derived class?

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Feb 19, 2013

Is there a way to call a function whose name is defined in a file-stored-list?

In other words: The caller doesn't know in compile time the name of the function.

I'm not talking about polymorphism.

The problem is: I have a list of function names stored in a file, that may change every now and then, and I'd like to call them in the sequence they appear in that list.

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Jul 18, 2014

Im new to debugging but it says the problem is on line 97 which is the verb menu function being called in the first switch statement case 0:

verb menu is one of the sub menus i want ,and it loads but then it crashes ...

#include <iostream>
#include <string>
#include "spanishverbs.h"
#include <windows.h>
#include <cmath>
#include <cstdlib>
using namespace std;
void nounmenu();

[Code] ....

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Oct 1, 2014

I have the code:

void go(CMFCApplication1Dlg * pdlg)
{
pdlg->listcontrol1.InsertItem(0, "Row1");
}

then i call it in thread

Code:
void CMFCApplication1Dlg::OnBnClickedButton3()
{
AfxBeginThread(go(this), NULL, THREAD_PRIORITY_NORMAL, 0, 0, NULL);
}

It doesn't work.

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Jun 7, 2012

I'm trying to get my C program to perform a few shell commands in a Linux environment, one of them being mount. The specific command is:

Code:
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If I put the above command in a system() call, it works. However, i tried to call mount directly, as defined in sys/mount.h, as follows:

Code:
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This doesn't work - it throws me back the error "Invalid argument".

Did I translate wrongly? What's the correct syntax?

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May 9, 2013

I have been trying to find a way around the following:

I am using a library functor to solve the root of a non linear equation. It passes two doubles and the name of a function that contains the equation to be solved.

Its xtor and operator are

RootFind(double tL,double tR,double (*fn)(double t));

void operator()(double tL,doubleR,double (*fn)(double t));

I want to be able to send another variable to function fn; I don't know what the value of the variable will be ahead of time.

How do I get the library functor to take an extra variable in the function passed?

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