Visual C++ :: How To Change Height And Width Of PNG Image Dynamically
Mar 4, 2013
I m trying to load a png image by giving the dimension of my own.
CImage Image;
Image.Load (L"D:ImagesPNG_ImagesImage7.png");
But here what happens is that I m not able to give my own dimensions.My code requires constant changing of dimensions of the image.
I tried using libpng.lib in my code.But I dono the keywords for loading the png image after including the lib.
I m using Visual Studio 2010. I m developing in vc++.
How do I load and change the height and width of a png image?
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Sep 5, 2013
If I get a bitmap from the clipboard with:
hBitmap=(HBITMAP)GetClipboardData(CF_BITMAP);
...how do I get the width and height ? Can I get at the BITMAPINFO ?
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Jul 1, 2014
I need a ownerdraw CListBox where I can change the item height during working with the list. The msdn says that I can specify the height in OnMeasureItem when the listbox will be created (ownerdrawfixed) or when an item will be inserted (ownerdrawvariable).
How to change the height e.g. when I click a button?
I made also some tests with CListCtrl. There I can change the height. But there is only one height for all items. How to set individual heights for the items?
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Mar 21, 2014
Basically when I type in different widths and heights for the col and rows, the buttons that make up the width get cut off. Something is messed up but I'm not sure what!
InitializeComponent();
int _col = int.Parse(cols);
int _row = int.Parse(rows);
int width = groupBox1.Width;
int height = groupBox1.Height;
int bW = width / _col;
int bH = height / _row;
[Code] ....
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May 13, 2014
The problem says:
Define functions n(), s(), e(), w(), center(), ne(), se(), sw() and nw(). Each takes a Rectangle argument and returns a Point. These functions define connection points on and in the rectangle. For example, nw® is the northwest (top-left corner) of a rectangle called r.
I wrote below code for that:
#include <Simple_window.h>
Point n(const Graph_lib::Rectangle& r);
Point s(const Graph_lib::Rectangle& r);
Point e(const Graph_lib::Rectangle& r);
Point w(const Graph_lib::Rectangle& r);
Point ne(const Graph_lib::Rectangle& r);
Point se(const Graph_lib::Rectangle& r);
[Code]...
As you see, this just mark the top-left corner of the rectangle r. In other functions I need the specifications of that rectangle, for example its height and width. How to use these specs in those functions?
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Dec 6, 2013
How would I make it so that I can have someone input the length, width and height for all 3 boxes and then have it output the sum and average volume? Here's an example of what I would like:
INPUT - Enter Box 1 (Length, Width, Height): 10.1 11.2 3.3
INPUT – Enter Box 2 (Length, Width, Height): 5.5 6.6 7.7
INPUT – Enter Box 3 (Length, Width, Height): 4.0 5.0 8.0
OUTPUT – The sum of the volume is 812.806
OUTPUT – The average volume is 270.935
Here's my original code:
#include <iostream>
using namespace std;
double box(double length, double width, double height); // use double data
int main() {
double sum;
sum = box(10.1, 11.2, 3.3) + box(5.5, 6.6, 7.7) + box(4.0, 5.0, 8.0);
[Code] .....
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Feb 11, 2013
Provide the definitions for the following class declaration and then write a program that demonstrates usage of each member function using the test data of 10 for width and 8 for height. Remember to put your main program, class header and class source into separate files. This is an easier version of the exercise than the one you have been asked to practice. Only provide code for the methods specified in the class declaration. Note that the displayRectangle() method should output an appropriate ‘box’, its dimensions, area and perimeter to the screen.
class Rectangle {
public:
Rectangle(int height, int width);
~Rectangle(void);
[Code] .....
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Dec 26, 2013
I am working on a Windows application using Visual Studio 2012. One of the screens have a text entry field for the user. Instead of using a standard text field control, am placing a image which looks exactly like a text field. Now what i want to do is, capture the key stroke and update this image with the characters entered by user.
The initial image shown to the user is "Blank_Text_Entry.png" and this is added to the resource as IDB_BLANK_TEXT_ENTRY.
This is a rectangular white image with dimensions 153 x 27, with a size of 250 bytes.
My goal is to be able to update this image dynamically based on key strokes by user and display it.
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Dec 30, 2013
how to adjust the combo box height?
I can adjust the combo box width and also the dropdown list height but not the combo box height.
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Sep 13, 2014
I am new to programming . My task is to change the background of the app so that every time I open the app I get a different background image and every minute the background image changes. I am a complete noob and I am trying to do this for almost 36 hours now. I am getting really depressed right now. Every time I am trying to write a code, there's an error.
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Jun 13, 2014
I've been working on making a sprite generator and this is one thing that has kept giving me difficulties. No matter what I've looked up nothing directly says how to nor can I find anything on a similar topic to try and apply to it either. I know how to add the resources and names for the options but how do I get the options to make my picturebox image change in relation to the selection?
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Jan 28, 2014
In a MDI-app with some toolbars and statusbar I created also a controlbar which can be docked to the left side. My problem now: how do I get the exact height of the controlbar?
In CalcDynamicLayout I set the height for the docked state to the height of the mainframe. This value is too big, but it will work basically.
But how can I get the exact height of the controlbar?
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May 15, 2013
I derived a class from CRecentFileList in order to set the number of displayed chars for MRU.
The problem is that if I open the app with 256 set for this number (it is read from .ini file) the display is correct. But after I change it to 10 for e.g., File menu width remains unchanged altghough MRU are correctly displayed on 10 (or at least file name lenghts) chars.
how can I tell to the menu to shrink to actual width?
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Jan 12, 2015
The question says:
Place an Image on top of a Button. Move both when the Button is pushed.
Please have a look at this code:
#include <GUI.h>
using namespace Graph_lib;
//------------------------------------------------
class rotation : public Window {
public:
rotation(Point xy, int w, int h, const string& title):
Window(xy,w,h,title),
[Code] ....
The problem is that, it is not possible to define an Image in public/private part of the class rotation. Image needs all arguments to be supplied even when declaring one. (Image is here in Graph.h)
And if I define that Image in the body of main() function, so how to provide access for void rotate() to change its position with the position of button simultaneously.
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Mar 20, 2014
my problem:I have a text (singleline) and a fix width for the whole text.
How do I find the correct font (height) for this text?
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Jul 3, 2014
Im trying to compare the image of a button to another image in Visual Studio like so...
//variables
Image active = Image.FromFile("C:\Users\Ethan\Desktop\StarWars Status\active.png");
Image stunned = Image.FromFile("C:\Users\Ethan\Desktop\StarWars Status\stunned.png");
[Code]...
btnStatusPlr1.Image SHOULD come back as True.Then I realized it might not be the same as setting the buttons image in the properties (Which is what i did to get the original image (the one being compared to))
I do have a feeling ive done something wrong here (Yes im a noob /> )
Variable active, is the same image as the buttons default (Well should be)
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Mar 21, 2012
My goal is to have couple of items in the listbox and when highlighting one item a image in the picturebox should appear, and so on for each item in the listbox.I just don't know how to change image depending on selected item in the listbox instantly.Also when i highlight item a text in label should be like in highlighted item in listbox.
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Sep 21, 2013
I want to control my toolbar dynamically.
First I added tool bar with style including TBSTYLE_EX_MIXEDBUTTONS | TBSTYLE_LIST.
Then added the tool bar to a rebar. I added tool tips by handling TTN_GETDISPINFO.
Everything works fine. But when I try to add text to right of the button, the text
gets added but button size is not automatically changing.
The following code is not working .
void SetToolbarText(HWND& hwndToolbar,LPTSTR szText)
{
ATLASSERT(::IsWindow(hwndToolbar));
TBBUTTONINFO tbbi = { 0 };
tbbi.cbSize = sizeof(TBBUTTONINFO);
tbbi.dwMask = TBIF_TEXT;// | TBIF_SIZE;//if I add TBIF_SIZE code will work!
tbbi.cchText = 0;
tbbi.cx = 200;
[Code]...
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Jun 23, 2013
This is what I try to achieve:
1. Using a CScrollView as the View class type.
2. Using Document/View Architecture.
3. Insert multiple Common Controls such as CEdit, CButton, CListCtrl into the View dynamically.
4. All the Common Controls is base on a template created by user. So I do not know the quantity of the Common Controls.
This is the plan on how to do it:
1. In View OnInitialUpdate(), read the template to get all necessary info on the Common Controls to be create.
2. In View OnInitialUpdate(), create all Common Control. Some Common Control may not have WS_VISIBLE as it may not needed at initial stage.
3. In View OnUpdate(), I need to refresh the Common Control properties such as is its text, position or its visibility. This should happen if Document call UpdateAllView().
My Question:
1. Is this a normal & useable plan?
2. Do I miss other functions for any other messages?
3. Still wondering if I need to involve any coding in OnDraw() for this plan.
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Apr 9, 2014
I am using CDHtmlDialog in my MFC application to create a UI with HTML, CSS & JavaScript.
In my project there's one dialog created from CDHtmlDialog and a corresponding HTML file for that dialog.
Now during run time i want to change the contents of the HTML file.
Not just the HTML part, i want to change the CSS & JavaScript too.
So basically what am trying to do is, change the entire content of the default HTML file.
Is this possible? If yes, how can i do that?
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Sep 6, 2013
I created a MFC dialog using CDHtmlDialog and added a HTML page with many controls and one of them is a IMAGE tag. I got a default image loaded from the hard drive displayed in the HTML page. Up to this part, everything works fine.
Now what i want to do is, dynamically change the image based on the user click on one of the HTML buttons. I don't want this image source to be hard coded in the HTML nor the image source send from the MFC app.
What i want is for the MFC app to send the image data to the HTML in some (binary) format and then the page to display the image.
The possible option i was thinking of was to read the image file which is already in my hard drive as a binary file and send the binary data across to the HTML as a memory buffer, and then use JavaScript to decrypt this binary data and display the image.
Basically what i want is for the HTML page to display a image from the memory. how to do this?
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Dec 16, 2012
I'm using CStatic inherited class in my code and creating static text boxes dynamically. Now for assigning unique control ID I'm creating a static control from resource editor and destroying it before calling CStatic::Create() and using its control ID say ID_STATIC_SAMPLE.
If I do not use this parameter of Create(), the static control is also being created, so what is the use of this unique ID. And any other better way to assign a ID for dynamically created static controls.
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Sep 16, 2013
Why the void pointer passed to testb doesn't continue pointing to the allocated integer after the function call returns.
Code:
#include <stdio.h>
#include <iostream>
void* testa() {
return new int(1);
[Code] ....
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Jan 27, 2013
how to create, initialize, and maintain a memory device context that works as a local buffer for images? The idea is to maintain some large images in local DCs and bitmaps, and only bitblt them to screen in OnDraw().
What I did so far was was to define CDC and CBitmap objects as members of my View class, and then tried to initialize them with the sequence that begins at "// Initialize buffer". I placed that sequence in either OnInitialUpdate, or PreCreateWindow, or OnPrepareDC, or the view constructor, to no avail. The code always crashes in OnDraw, and I've noticed that the m_hDC member of myDevice is zero at that point.
Obviously, the initialization is wrong and MFC does (too many) things in the background which I'm not aware of.... My question was where can I read about that?
Code:
class CMyView : public CScrollView {
// ...
CDC myDevice;
CBitmap bmp;
CBitmap *oldbmp;
[Code] .....
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Sep 23, 2013
I have the raw image data and now want to convert it to PNG image. How can i do that? The raw image data is stored in a unsigned char *.
I know how to convert it to Bitmap, but how to convert it to PNG.
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Mar 20, 2014
Which command should i use for displaying a jpeg image in Visual Studio 2008 (VC++)?In the past i used LoadImage function for displaying Bitmaps.
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