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Last question, when I do that, how do I specify the color that is to be transparent?
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I would tend to use the last parameter of TransparentBlt to do that:
UINT crTransparent You can specify a color in hex, 0xFFCC00 is FF red, CC green, 00 blue.
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Instead of converting to bitmaps (where you lose transparency) you can load them as GDI+
Bitmap objects and GDI+ will handle the alpha blending right for transparency.
As a starting point, try something like this in OnPaint or OnEraseBkgnd...wherever you're painting
a window...
HICON hIcon = ::LoadIcon(AfxGetInstanceHandle(), CResId(IDR_MAINFRAME));
Bitmap bitmap(hIcon);
Graphics graphics(*pDC);
graphics.DrawImage(&bitmap, 0, 0);
Of course, in real life you wouldn't want to reload an icon resource (or worse, bitmap from a
file) every time you paint so you'd load it once (in the window class constructor or OnCreate)
and use the same object to draw every time.
This just makes a simple test example...try it 
To try it on PNGs and GIFs replace these lines
HICON hIcon = ::LoadIcon(AfxGetInstanceHandle(), CResId(IDR_MAINFRAME));
Bitmap bitmap(hIcon);
with
Bitmap bitmap(L"path\MyPNGFile.png", TRUE);
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Thanks Mark.
Do you also know how to use the CImage::SetTransparentColor(...) function?
Thanks,
BP
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BlitzPackage wrote: Do you also know how to use the CImage::SetTransparentColor(...) function?
I've never used the CImage class...sorry.
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I took a glance at CImage - It looks like it uses GDI+ as well so I would assume that if
you load the original icons/gifs/pngs (not the ones converted to bitmaps) they should draw
properly like the code sample I posted.
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Thanks Mark.
If I do that, how do I get them to their proper place on the toolbars, buttons, menus, etc...?
BP
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Ohhhh you are using them as bitmaps on conrols? I thought you were just rendering them to the
screen in a window 
In that case I would put them in a bitmap and use image lists in the code.
Example 18 pixel wide bitmap(s) using bright green as transparent color in the bitmaps:
CImageList MyImageList;
...
MyImageList.Create(IDB_BITMAP, 18, 18, RGB(0x00,0xFF,0x00));
This will get you an image list. Check out the controls you're using and look for SetImageList()
method in the classes (CToolBar, CButton, etc.)
I could post some sample code but I'm not sure what exactly you are trying to do with the bitmaps.
Mark
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Thanks Mark,
If you could post some sample code that would be great. I am just trying to use them as menu icons, button icons, tool bar icons, etc...
Any help you can provide would be great.
Thanks again.
BP
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Here's an example of a Windows toolbar common control with two buttons...
Add these to your window class:
CToolBarCtrl ToolBar;
CImageList MyImageList;
Add this to your window class' .cpp file
static TBBUTTON ToolBarButtonDescs[] =
{
{0, ID_BUTTON1, TBSTATE_ENABLED, TBSTYLE_BUTTON, {0,0}, 0, 0} ,
{1, ID_BUTTON2, TBSTATE_ENABLED, TBSTYLE_BUTTON, {0,0}, 0, 0}
};
Add this to the window class constructor
MyImageList.Create(IDB_BITMAP, 18, 18, RGB(0x00,0xFF,0x00));
Add this to the window class' OnCreate() (WM_CREATE handler)
ToolBar.Create(WS_CHILD | WS_VISIBLE, CRect(0,0,100,20), this, ID_TOOLBAR);
ToolBar.SetImageList(&MyImageList);
ToolBar.AddButtons(sizeof(ToolBarButtonDescs) / sizeof(TBBUTTON), ToolBarButtonDescs);
The trick is creating the image list bitmap. In this case I have two buttons, 18 pixels wide so
add a bitmap resource 36x18. I've set the bitmap index for button 1 to index 0 and button 2 to
index 1 in the image list. So the rect (0,0,17,17) in the bitmap needs to be the image you want
on the first button and the rect (18,0,35,17) will be the image for the second button. I've
specified RGB(0x00,0xFF,0x00) (bright green) as the transparent color so draw any areas you want
to be transparent in that color. The image list bitmap is the images for all the buttons side-by-
side. I've used 18 pixel wide bitmap (per button) as an example but you can use whatever width
you want. The height will be calculated automagically based on the image width you specify in
this call:
MyImageList.Create(IDB_BITMAP, 18, 18, RGB(0x00,0xFF,0x00));
where the first 18 is the per-image width in the list and the second 18 is the grow-by value
when programatically adding bitmaps to the list.
You can use a different transparency color too.
Make sense?
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Thanks Mark,
That is very understandable. I will apply what you have provided. For buttons, I guess I will use the SetImageList function...right?
Thanks again,
BP
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BlitzPackage wrote: For buttons, I guess I will use the SetImageList function...right?
You can. I just took another look at that...its for XP+/Comclt32.dll version 6.0+ only.
For individual buttons you may want to use icon resources (for transparency)...
CButton button;
...
button.SetIcon(AfxGetApp()->LoadIcon(IDI_ICON));
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what i want:
i have a dialog with 4 buttons on it each time i push a button a different dialog will open and hide the first dialog then when i close that dialog the first opens again.
what i have:
i have it where it will open the other dialogs i just cant figure out how to get the first to reopen when i close the other dialogs.
i need the part that going in the other dialogs that will open the first dialog when it closes and cant figure it out. 
this is in the main dialog
::ShowWindow(m_hWnd, SW_HIDE);<br />
p2->ShowWindow(SW_SHOW); <--- thoes 2 lines work
i tryed passing the handle of the main to the rest still didnt work
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I am new to VC++/MFC, so I am sure someone will have a more elegant solution. Try this approach:
When the button is pushed on the first dialog, save whatever settings of the member variables you need, then call the default IDOK (CDialog::OnOK()) - default OnOK will close the dialog box
Call DoModal on the other Dialog, then, when finished before calling DoModal on the first dialog, set its member variable appropriately, then call DoModal
Hope this helps.
Peace,
BP
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i got it!!! 
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p2->maindlg = m_hWnd; in main dialog and
void PrivacyCleaner::OnClose() <br />
{<br />
<br />
::ShowWindow(maindlg, SW_SHOW);<br />
CDialog::OnClose();<br />
}<br />
<br />
void PrivacyCleaner::OnCloseButton() <br />
{<br />
CDialog::EndDialog(0);<br />
OnClose(); <br />
}
in other dialogs
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I just found this: http://msdn2.microsoft.com/en-us/library/wddd3ztw(VS.80).aspx
You can call CDialog::EndDialog(int nResult). Any value will do for nResult.
Hope this helps.
BP
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Hi everyone
i am developing new class that inherits from mshflexgrid, i need it to be editable so, i have an edit box that is located in the current selected cell.
i need to have this edit box always visible even if the grid lost the focus
when the current cell is the previous one to the last(the whole number of row is 30 and 10 are visible), and am scrolling up (so the current cell should move down) the grid automatically scroll down to show the edit box again.
i want to stop this automatic scroll to keep the edit box invisible
how can i solve this please?
and thanks alot
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Tarek Jabri wrote: mshflexgrid problem
Instead of fighting with the flex grid (which is what your going to be doing), try this grid MFC Grid control 2.26
by Chris Maunder [^]
I'd love to help, but unfortunatley I have prior commitments monitoring the length of my grass. :Andrew Bleakley:
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I don't understand why this fails:
LPTSTR FileHelper::GetFileFullPath( LPWSTR lpwName )
{
LPTSTR lptFileFullPath;
DWORD len = GetCurrentDirectory( 0, NULL );
LPWSTR lpwFolder;
lpwFolder = (LPWSTR) malloc( len );
if ( lpwFolder == NULL )
{
free ( lpwFolder );
return NULL;
}
if ( GetCurrentDirectory( len, lpwFolder ) != 0 )
{
len = (DWORD) ( wcslen( lpwFolder ) + wcslen( lpwName ) + 6 );
lptFileFullPath = (LPTSTR) malloc( len );
// Here lptFileFullPath simply evaluates to NULL, showing the <bad ptr=""> ?!
if ( lptFileFullPath == NULL )
{
free ( lptFileFullPath );
return NULL;
}
// ...the rest of the code stripped off...
}
return lptFileFullPath;
}
This is under Visual Studio 2005, UNICODE defined by default.
Thanks.
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I think your first malloc is wrong. "len" is the length of the current directory in characters but malloc() takes a number of bytes i.e. it should be sizeof(TCHAR) * len.
0 bottles of beer on the wall, 0 bottles of beer, you take 1 down, pass it around, 4294967295 bottles of beer on the wall.
Awasu 2.2.3 [^]: A free RSS/Atom feed reader with support for Code Project.
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First, why are you not using new and delete? and second, why are you calling free() on what you already know to be a NULL pointer?
Now for your problem, GetCurrentDirectory() is returning the length required excluding the terminating NULL character, but you are not adding this when you call malloc. so your second call will read the string and not write the NULL. Later when you call wstrlen(), it is reading the string uo until the first NULL it finds, which could be anywhere. Therefore may return an insanly high value. When used in malloc, it returns NULL because there is not enough memory.
The problem has nothing to do with sizeof(TCHAR)
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Thanks, you are totally right.
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I would recommend looking VERY closely at all the string functions you use.
Some use/return lengths in characters. Some use/return lengths in bytes.
Some include NULL terminator in lengths. Some do not.
LPTSTR FileHelper::GetFileFullPath( LPWSTR lpwName )
{
LPTSTR lptFileFullPath;
DWORD LenInChars = GetCurrentDirectory( 0, NULL );
++LenInChars;
LPWSTR lpwFolder;
lpwFolder = (LPWSTR) malloc( LenInChars * sizeof(TCHAR) );
if ( lpwFolder == NULL )
{
return NULL;
}
if ( GetCurrentDirectory( LenInChars, lpwFolder ) != 0 )
{
LenInChars = (DWORD) ( wcslen( lpwFolder ) + wcslen( lpwName ) + 1 );
lptFileFullPath = (LPTSTR) malloc( LenInChars * sizeof(TCHAR));
if ( lptFileFullPath == NULL )
{
free( lpwFolder );
return NULL;
}
}
free( lpwFolder );
return lptFileFullPath;
}
*EDIT* And for goodness sakes, use new/delete instead of malloc/free!!!
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