Creating a Windows Forms Control (C++) - c++

Question

trying to run this basic form control example on msdn.
At step 1 of the portion "To add a custom property to a control" we place the ClickAnywhere code in the public section of the class.
First error: "error C2144: syntax error : 'bool' should be preceded by ';'"
Is this syntax correct in C++? (see below)
(removing the ClickAnywhere portion of code, it compiles fine...)
#pragma once
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::Drawing;
namespace clickcounter
{
/// <summary>
/// Summary for clickcounterControl
/// </summary>
///
/// WARNING: If you change the name of this class, you will need to change the
/// 'Resource File Name' property for the managed resource compiler tool
/// associated with all .resx files this class depends on. Otherwise,
/// the designers will not be able to interact properly with localized
/// resources associated with this form.
public __gc class clickcounterControl : public System::Windows::Forms::UserControl
{
public:
//Problem code*****
property bool ClickAnywhere { //Is this syntax right in C++?
bool get() {
return (label1->Dock == DockStyle::Fill);
}
void set(bool val) {
if (val)
label1->Dock = DockStyle::Fill;
else
label1->Dock = DockStyle::None;
}
}
//End Problem code*****
clickcounterControl(void)
{
InitializeComponent();
}
protected:
void Dispose(Boolean disposing)
{
if (disposing && components)
{
components->Dispose();
}
__super::Dispose(disposing);
}
private: System::Windows::Forms::Label * label1;
private:
/// <summary>
/// Required designer variable.
/// </summary>
System::ComponentModel::Container* components;
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
void InitializeComponent(void)
{
this->label1 = new System::Windows::Forms::Label();
this->SuspendLayout();
//
// label1
//
this->label1->BorderStyle = System::Windows::Forms::BorderStyle::FixedSingle;
this->label1->Location = System::Drawing::Point(32, 40);
this->label1->Name = S"label1";
this->label1->Size = System::Drawing::Size(30, 20);
this->label1->TabIndex = 0;
this->label1->Text = S"0";
this->label1->TextAlign = System::Drawing::ContentAlignment::MiddleCenter;
this->label1->Click += new System::EventHandler(this, label1_Click);
//
// clickcounterControl
//
this->Controls->Add(this->label1);
this->Name = S"clickcounterControl";
this->Size = System::Drawing::Size(100, 100);
this->ResumeLayout(false);
}
private: System::Void label1_Click(System::Object * sender, System::EventArgs * e)
{
int temp = System::Int32::Parse(label1->Text);
temp++;
label1->Text = temp.ToString();
}
};
}

Answer 1

Since you are using Visual Studio .Net 2003, you are using Managed C++, not C++/CLI. There is a significant difference in syntax. For a property, you must use the __property keyword, not the C++/CLI property keyword and its new style.
It should therefore be:
__property bool get_ClickAnywhere() {
return (label1->Dock == DockStyle::Fill);
}
__property void set_ClickAnywhere(bool value) {
if (value)
label1->Dock = DockStyle::Fill;
else
label1->Dock = DockStyle::None;
}
It looks like you are being tripped up by following a guide written for C++/CLI (Visual Studio 2005 and later) while still using Visual Studio 2003.