error non-standard syntax; use '&' to create a pointer to membe

asked 2019-01-21 16:30:58 -0600

Allaye
59 ●1 ●5

updated 2019-01-21 19:38:30 -0600

sjhalayka

1170 ●4 ●18

void Blending::Blend(int, void*)
{
    alpha = (double)defaultvalue / 100;
    addWeighted(img, alpha, img2, 1.0 - alpha, 0, des);
    imshow("Blendimage", des);
}

int main()
{
    Blending ble;

    ble.Blend(defaultvalue, 0);

    createTrackbar("Blend", "Blendimage", &defaultvalue, maximumvalue, ble.Blend);
    waitKey(0);

    return 0;
}

i get the non-standard error when i pass the Blend function to createTrackBar using the object of the class to call the function direct.. any help pls

Comments

using the object of the class to call the function direct.

problem is: your code does NOT use the object ;)

berak ( 2019-01-21 18:51:36 -0600 )edit

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answered 2019-01-21 17:56:56 -0600

sjhalayka

1170 ●4 ●18

updated 2019-01-21 17:59:11 -0600

You can make the function static, and call it accordingly:

class c
{
public:
    static void on_trackbar(int, void*)
    {

    }
};

// ...

createTrackbar("Foo", "Bar", &some_variable, another_variable, c::on_trackbar);

If this code does not solve your problem, then please let me know. On the other hand, if this code does solve your problem, then please upvote my answer and mark it as correct. Thank you.

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Comments

header file------

class Blending
{
public:
    static void Blend(int, void*);
    int Blended();
    //int imageinput();

    double alpha, beta;
     int  key;
    int defaultvalue;
};


    void Blending::Blend(int, void*)
    {
        Blending b;
        b.alpha = (double)b.defaultvalue / 100; // error uninitialized local variable "b" used 
        addWeighted(img, b.alpha, img2, 1.0 - b.alpha, 0, des);
        imshow("Blendimage", des);
    }


int main()
{
    Blending ble;

    ble.Blend(defaultvalue, 0);

    createTrackbar("Blend", "Blendimage", &defaultvalue, maximumvalue, Blending::.Blend);
    waitKey(0);

    return 0;
}

when i build the code i get the error message "uninitialized local variable "b" used", any help

Allaye ( 2019-01-22 05:07:12 -0600 )edit

when i build the code i get the error message "uninitialized local variable "b" used", any help

Allaye ( 2019-01-22 05:07:28 -0600 )edit

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error non-standard syntax; use '&' to create a pointer to membe

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error non-standard syntax; use '&' to create a pointer to membe