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Views: 977 | Replies: 2 | Solved
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Join Date: Jan 2008
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I am trying to learn Visual C++, particularly the GUI components, so I tried to make a simple program where a button is displayed to a frame and when the button is pressed, a cout statement is invoked which displays a message to the console saying that the button has been pressed. I created a new project of type "Windows Forms Application", then dragged a button onto the GUI, brought up the properties and added a "button_1_Click" function. Within that function I added a simple cout statement. The problem is that I see nothing displayed when I click that button. Here is my code (auto-generated except for a couple of lines - cout line is line 89):
I put a breakpoint on line 89 to make sure that function is being called when the button is pressed, and it is. However, I see no output when I click this button.
cplusplus Syntax (Toggle Plain Text)
#pragma once #include <iostream> namespace trialprogram1 { using namespace System; using namespace System::ComponentModel; using namespace System::Collections; using namespace System::Windows::Forms; using namespace System::Data; using namespace System::Drawing; /// <summary> /// Summary for Form1 /// /// 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. /// </summary> public ref class Form1 : public System::Windows::Forms::Form { public: Form1(void) { InitializeComponent(); // //TODO: Add the constructor code here // } protected: /// <summary> /// Clean up any resources being used. /// </summary> ~Form1() { if (components) { delete components; } } private: System::Windows::Forms::Button^ button1; protected: private: /// <summary> /// Required designer variable. /// </summary> System::ComponentModel::Container ^components; #pragma region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> void InitializeComponent(void) { this->button1 = (gcnew System::Windows::Forms::Button()); this->SuspendLayout(); // // button1 // this->button1->Location = System::Drawing::Point(39, 23); this->button1->Name = L"button1"; this->button1->Size = System::Drawing::Size(75, 23); this->button1->TabIndex = 0; this->button1->Text = L"button1"; this->button1->UseVisualStyleBackColor = true; this->button1->Click += gcnew System::EventHandler(this, &Form1::button1_Click); // // Form1 // this->AutoScaleDimensions = System::Drawing::SizeF(6, 13); this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font; this->ClientSize = System::Drawing::Size(292, 266); this->Controls->Add(this->button1); this->Name = L"Form1"; this->Text = L"Form1"; this->ResumeLayout(false); } #pragma endregion private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) { std::cout << "button1 has been pushed\n"; } }; }
cplusplus Syntax (Toggle Plain Text)
// trialprogram1.cpp : main project file. #include "stdafx.h" #include "Form1.h" using namespace trialprogram1; [STAThreadAttribute] int main(array<System::String ^> ^args) { // Enabling Windows XP visual effects before any controls are created Application::EnableVisualStyles(); Application::SetCompatibleTextRenderingDefault(false); // Create the main window and run it Application::Run(gcnew Form1()); return 0; }
I put a breakpoint on line 89 to make sure that function is being called when the button is pressed, and it is. However, I see no output when I click this button.
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Join Date: Oct 2007
Location: Cherry Hill, NJ
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You should have gotten a runtime exception for trying it...
Anyway, Windows apps don't have consoles by default. At the beginning of your program you'll have to
then... you'll have to hook the standard streams up to the console:
http://www.halcyon.com/~ast/dload/guicon.htm
(yoinks!)
Its easier than it looks.
Have fun.
Anyway, Windows apps don't have consoles by default. At the beginning of your program you'll have to
AllocConsole();then... you'll have to hook the standard streams up to the console:
http://www.halcyon.com/~ast/dload/guicon.htm
(yoinks!)
Its easier than it looks.
Have fun.
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Join Date: Jan 2008
Posts: 1,780
Reputation:
Rep Power: 8
Solved Threads: 219
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You should have gotten a runtime exception for trying it...
Anyway, Windows apps don't have consoles by default. At the beginning of your program you'll have to
AllocConsole();
then... you'll have to hook the standard streams up to the console:
http://www.halcyon.com/~ast/dload/guicon.htm
(yoinks!)
Its easier than it looks.
Have fun.
All right, that worked! And on the first try for once. It was interesting that this was mostly C code in that link. Basically I cut and pasted guicon.h and guicon.cpp verbatim, then added a call to RedirectToConsole () before any cout statements. I may fiddle with it, but then again, if it ain't broke, don't fix it. Thanks for the link.
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