Show a message box when I press a button

Question

0.00/5 (No votes)

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I wrote:

int DisplayResourceNAMessageBox()
{
	int msgboxID = MessageBox(
		NULL,
		(LPCWSTR)L"Resource not available\nDo you want to try again?",
		(LPCWSTR)L"Account Details",
		MB_ICONWARNING | MB_CANCELTRYCONTINUE | MB_DEFBUTTON2
	);

	switch (msgboxID)
	{
	case IDCANCEL:
		// TODO: add code
		break;
	case IDTRYAGAIN:
		// TODO: add code
		break;
	case IDCONTINUE:
		// TODO: add code
		break;
	}

	return msgboxID;
}

void CMFCApplication7Dlg::OnBnClickedMessage()
{
	//TCHAR e[1000] = _T("HELLO");
	//MessageBox(NULL, e);
	DisplayResourceNAMessageBox;


	
	// TODO: Add your control notification handler code here
}

What I have tried:

message box doen't show when I click button, but I don't know why, I work with mfc c++

Posted 20-Sep-19 2:55am

Member 14594285

Updated 20-Sep-19 3:29am

v2

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3 solutions

Solution 1

You don't call the containing method:

C++

void CMFCApplication7Dlg::OnBnClickedMessage()
{
	DisplayResourceNAMessageBox;
}

Add "()" to the line:

C++

void CMFCApplication7Dlg::OnBnClickedMessage()
{
	DisplayResourceNAMessageBox();

Posted 20-Sep-19 3:11am

OriginalGriff

Solution 3

if I wrote in .h

int DysplayResourcedNAMessageBox()

and in .cpp

DisplayResourceNAMessageBox();

I have this error:

Severity	Code	Description	Project	File	Line	Suppression State
Error	LNK2019	unresolved external symbol "public: int __thiscall CMFCApplication7Dlg::DisplayResourceNAMessageBox(void)" (?DisplayResourceNAMessageBox@CMFCApplication7Dlg@@QAEHXZ) referenced in function "public: void __thiscall CMFCApplication7Dlg::OnBnClickedButton6(void)" (?OnBnClickedButton6@CMFCApplication7Dlg@@QAEXXZ)	MFCApplication7	C:\Dev2015\Prg\MFCApplication7\MFCApplication7Dlg.obj	1

Posted 20-Sep-19 3:29am

Member 14594285

Comments

Richard Deeming 20-Sep-19 9:39am

Yet another comment posted as a "solution".

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CPallini · Accepted Answer · 2019-09-20T03:20:00

Solution 2

Quote:
void CMFCApplication7Dlg::OnBnClickedMessage()
{
//TCHAR e[1000] = _T("HELLO");
//MessageBox(NULL, e);
DisplayResourceNAMessageBox;

Since you missed the round brackets, the statement has NO effect. Replace it with

C++

DisplayResourceNAMessageBox();

Remember to enable all the warnings of your compiler.

Posted 20-Sep-19 3:20am

CPallini

Comments

Member 14594285 20-Sep-19 9:39am

I solved, I didn't write cmfApplication::Display..