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QuestionHow to pass a function pointer an argument in managed C++ Pin
yehiga146724-May-21 2:25
yehiga146724-May-21 2:25 
I am trying to call a function defined in the parent class via the object. But I am getting the error a pointer to member is not valid for a managed class. How can I achieve what I wanted? My expected output is to display the text "Called from child"


MyChild.h
ref class MyChild
{

       System:Void(*my_func_ptr)(int, char*);
       typedef System:Void(*MyFuncPtrType)(int, char*);
       MyFuncPtrType my_func_ptr;


	public: MyChild ( System:Void(*some_func)(int, char*)){

		my_func_ptr = some_func;
	}

	public: System::Void  Child_ButtonClicked(System::Object^ sender, System::EventArgs^ e){
		my_func_ptr();
	}

}



MyForm.h

#include "MyChild.h"

public ref class MyForm : public System::Windows::Forms::Form
{
.
.
.
	private: static System:Void test(int, char*) { //Update
		MessageBox::Show("Called from child");
	}


	private: System::Void MyForm::MyForm_Load(System::Object^ sender, System::EventArgs^ e) {
		MyChild^ child= gcnew MyChild( MyForm::test); //type incompatible error in this line
		child -> test(1,"random");
	}


}




Update 2, Previous problem for //type incompatible error in this line is solved using the following way below.





MyChild.h
ref class MyChild
{
	   
	   
	private:     System::Void(*my_func_ptr)(int, char*);

	public:	System::Void doFunction(int A, char* B) {
           (*my_func_ptr)(A,B);
       }


	public: MyChild ( System::Void(*func)(int A, char* B)){

		my_func_ptr = func;
	}

	public: System::Void  Child_ButtonClicked(System::Object^ sender, System::EventArgs^ e){
		doFunction(1,"random");  //the arguments here are not used in later program, it is just for testing a function ptr with arguments
	}

}



MyForm.h

#include "MyChild.h"

public ref class MyForm : public System::Windows::Forms::Form
{
.
.
.

	   typedef System::Void (*callback_function)(int, char*); 
	   
	   
	private: static System:Void test(int, char*) {
		MessageBox::Show("Called from child");
	}


	private: System::Void MyForm::MyForm_Load(System::Object^ sender, System::EventArgs^ e) {
	
	
	callback_function disc;

	disc = (callback_function)(MyGUI::MyForm::test);
	
		MyChild^ child= gcnew MyChild( disc);
		child -> doFunction(1,"random");
	}


}


For now, everything is solved but I am still unsure to the reason for incompatibility for argument and parameter having same type. I will do more trails and see if this is a stable way of implementation. Thanks for your help Richard Andrew x64 !

modified 25-May-21 0:07am.

AnswerRe: How to pass a function pointer an argument in managed C++ Pin
Richard MacCutchan24-May-21 5:00
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GeneralRe: How to pass a function pointer an argument in managed C++ Pin
yehiga146724-May-21 17:44
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AnswerRe: How to pass a function pointer an argument in managed C++ Pin
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QuestionConvert Native Pointer to IntPtr Pin
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AnswerRe: Convert Native Pointer to IntPtr Pin
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AnswerRe: How to call System::Windows::Forms::Controls "invoke" method? Pin
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