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How do you get the width of a scrollbar assocaiated to a given control?
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It depends on the type of scrollbar.
If it's a standard scrollbar, you can use GetSystemMetrics().
If it's a scrollbar control, you can use GetWindowRect().
For scrollbars implemented by custom controls, you're on your own 
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/coffee.gif)
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in MFC afx.h Ln366,I see this:
#define ENSURE_THROW(cond, exception) \
do { int __afx_condVal=!!(cond); ASSERT(__afx_condVal); if(!(__afx_condVal)){exception;} } while (false)
why do{...}while(false)?
is that equal to this:
#define ENSURE_THROW(cond, exception) \
int __afx_condVal=!!(cond); ASSERT(__afx_condVal); if(!(__afx_condVal)){exception;}
and why use "int __afx_condVal=!!(cond);",is this ensure the value of __afx_condVal is either 1 or 0?
Stay Hungry. Stay Foolish
Thanks Alot!
-- modified at 14:06 Friday 5th October, 2007
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Howdy guys, just a quick question about a small problem I am having in a little chat application I made for the sake of learning.
Currently I want my app to minimize to my tray displaying its icon. I want the window to be hidden completly, I dont want it to appear minimized in the taskbar. If the user wants to open the app he can double click the icon in the tray. I got the animation working, my icon loads in the try, however I cannot hide the window. It minimizes to the task bar below making it appear "miniized". It should be hidden no?
Currently I am using this command I assumed it would hide everything. Any obvious thoughts come to mind on what I might be doing wrong?
ShowWindow(m_hWnd, SW_HIDE);
If you want I can display more code just let me know!
Thanks Alot!
Cliff
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See http://www.codeproject.com/dialog/hidetaskbar.asp
IMNOOPR
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OK going to look into this more. Seems like alot of work just to hide the window out of the taskbar.
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Are you sure you're passing the right HWND to ShowWindow()?
What's style and extended styles does the app's main window have?
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Yea I have m_hWnd as my main window. I'm passing these styles apon its creation.
WS_OVERLAPPEDWINDOW|WS_VISIBLE
This gets passed into a win32 wrapper class constructor and is saved to m_dwStyles;
Here is my extended style
WS_EX_CLIENTEDGE
m_hWnd = CreateWindowEx (WS_EX_CLIENTEDGE,<br />
m_pClassName, m_pWindowTitle,<br />
m_dwStyles,<br />
m_pRect->left,<br />
m_pRect->top,<br />
m_pRect->right-m_pRect->left,<br />
m_pRect->bottom-m_pRect->top,<br />
NULL, <br />
m_hMenu,<br />
m_hInstance, <br />
(void *)this);
Mark you always seem to save me! Hope you have some ideas for this one. Thank you sir. =)
Cliff
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hmm... I use the same style and, like DavidCrow (except in a different order),
I just do
Shell_NotifyIcon(...)
ShowWindow(SW_HIDE)
Any other window stuff going on?
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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I had wanted to have the client drop to the tray and post a balloon when someone messags you. My tray icon works but the apps tays in the taskbar as minimized.
Could it be my animation?
Heres everything I have in the minimize function
void ChatApp::miniMizeTray(const int icon)<br />
{<br />
ANIMATIONINFO anii;<br />
anii.cbSize = sizeof(anii);<br />
SystemParametersInfo(SPI_GETANIMATION, sizeof(anii), &anii, 0);<br />
<br />
RECT desktopRect, thisWindowRect;<br />
GetTrayWndRect(&desktopRect);<br />
GetWindowRect(m_hWnd, &thisWindowRect);<br />
<br />
if (anii.iMinAnimate)<br />
{<br />
DrawAnimatedRects(m_hWnd, IDANI_CAPTION, &thisWindowRect, &desktopRect);<br />
}<br />
<br />
ShowWindow(m_hWnd, SW_HIDE);<br />
<br />
NOTIFYICONDATA nid;<br />
ZeroMemory(&nid, sizeof(nid));<br />
nid.cbSize = sizeof(nid);<br />
nid.hWnd = m_hWnd;<br />
nid.uID = 0;<br />
nid.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP | NIF_INFO;<br />
nid.uCallbackMessage = WM_USER;<br />
nid.hIcon = LoadIcon(m_hInstance, MAKEINTRESOURCE(icon));<br />
nid.uTimeout = 1000;<br />
nid.dwInfoFlags = NIIF_INFO;<br />
lstrcpy(nid.szTip, "Double-Click To Maximize.");<br />
lstrcpy(nid.szInfo, "ChatApp has been minimized to the system tray.\nClick this icon to restore the application.");<br />
lstrcpy(nid.szInfoTitle, "Chat App");<br />
<br />
Shell_NotifyIcon(NIM_ADD, &nid);<br />
}
If I dont get back to you today I will definately on Monday. I'm going to make another run through the code and see if I find anything. Ill come back in the afternoon to see if you guys have any ideas. Thanks for the help!
Cliff
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Just for the heck of it, maybe try Shell_NotifyIcon() without the
NIF_INFO flag. Same result?
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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No, same thing unfortunately. Maybe I can come up with something this weekend. Ill take a peak. Quiet an odd one, I know I am missing something somewhere.
Thanks again!
cliff
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I would suggest creating a test application that does nothing but minimize itself to the icon notification area.
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Thats a great idea. Gunna go do it now. I'll just make a simple window with a edit box inside. We will see how it goes... I'll post tommarow!
Thanks David.
Cliff
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Ok guys I solved the problem in my WinProc Func.
Here is what I have.
case WM_SYSCOMMAND:<br />
switch (wParam) <br />
{<br />
case SC_MINIMIZE:<br />
if (!m_bInTray)<br />
{<br />
miniMizeTray(IDI_ICON1);<br />
m_bInTray = true;<br />
}<br />
break;<br />
}<br />
DefWindowProc(m_hWnd, uMsg, wParam, lParam);<br />
if (m_bInTray == true)<br />
{<br />
ShowWindow(m_hWnd, SW_HIDE);<br />
}<br />
break;
Originally I did not have the ShowWindow command here, for kicks I added it before the DefWindowProc command, then I added it after. As soon as I added it after it worked correctly. Now due to the way I have my app setup, I am using a bool to let the app know whether or not it's in the tray, I had to setup a simple if statement for the same reason.
Any ideas on why I have to place this after the DefWindowProc command?
Cliff
-- modified at 9:43 Monday 8th October, 2007
Just to add, I figured it out making another smaller app with nothing in it accept an edit window and the same minimize functions. Thanks for that advise David! =)
Cliff
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I just wrote a similar "tray" applicaton. At the appropriate time, I just called ShowWindow() (followed by Shell_NotifyIcon()).
Beaon wrote: ShowWindow(m_hWnd, SW_HIDE);
That's all you need, assuming that m_hWnd is valid and the correct window handle.
"A good athlete is the result of a good and worthy opponent." - David Crow
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Yea I am running that command right after ShowWindow, makes no difference.
It sounds like I am callig the wrong HWND handle, but my main window is m_hWnd, everything else is a child of that. I just breifly double checked all my other HWND handles and found them all WS_CHILD. with m_hWnd as the parent accept the tooltips. My tooltips are children to the window in which they tip. I thought thats how I was suppose to do it but I dont think that will make a difference here.
Any thoughts?
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Is anyone of you familiar with Anti-Grain Geometry? I just stumbled across it this week and would love to use it in my program but I can't figure out HOW to use it!
I am trying to use the C# wrapper created by the guys at CreativeDocs.Net --> http://www.creativedocs.net/
I just need someone to quickly explain how to replace gdi with agg.
Just so you know, I have exhuasted google trying to find some kind of documentation. 
Any pointers would be greatly appreciated!
Richard
may your code be error free.
(okay, maybe two lines.)
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Hello Friends,
I have created the New Desktop. And I am able to Switch to and from new Desktop to Default Desktop and Default Desktop to New desktop (Thnx to nitin3) .
But There is one Problem I am facing when I am switching to new Desktop.
I am not able to open the Task Manager in new desktop
If anybody knows how to solve the problem or why this is happening ? if anybody knows please tell me. It will be great help to me.
The other things I want to do is to personalize the ICONS and Wallpaper for new Desktop. i.e. if somebody changes the wallpaper in new desktop it should not be reflected in default desktop.
I dont know whether it is possible or not ??. If Some body have anu idea or suggation please tell me.
Thanx in Advance
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Alright, this is not code oriented and so I'll make it brieft:
Sorry don't know how to add code in this forum yet (rather new)
A class like this:
#ifndef VXT_SIMPLE_BUTTON_SPEC<br />
#ifdef VXT_UIUTILS_DLL<br />
#define VXT_SIMPLE_BUTTON_SPEC __declspec(dllexport)<br />
#else<br />
#define VXT_SIMPLE_BUTTON_SPEC __declspec(dllimport)<br />
#endif<br />
#endif<br />
<br />
class VXT_SIMPLE_BUTTON_SPEC vxtUISimpleButton: public CGXStatic
the inherited class is FROM stingray and is now using dll interface compared to previous release like so:
#ifdef _GXDLL<br />
#ifdef _GXDLL_IMPL<br />
#define GRID_API __declspec( dllexport )<br />
#else<br />
#define GRID_API __declspec( dllimport ) <br />
#endif<br />
#else // !_GXDLL<br />
#define GRID_API<br />
#endif<br />
<br />
<br />
class CGXStatic : public CGXControl<br />
{<br />
DECLARE_CONTROL(CGXStatic)<br />
<br />
public:<br />
GRID_API CGXStatic(CGXGridCore* pGrid);<br />
<br />
GRID_API virtual CRect GetCellRect(ROWCOL nRow, ROWCOL nCol, LPRECT rectItem = NULL, const CGXStyle* pStyle = NULL);<br />
GRID_API virtual CSize AddBorders(CSize size, const CGXStyle& style);
<br />
GRID_API virtual CSize CalcSize(CDC* pDC, ROWCOL nRow, ROWCOL nCol, const CGXStyle& style, const CGXStyle* pStandardStyle, BOOL bVert);<br />
<br />
GRID_API virtual BOOL CanFloatCell(ROWCOL nRow, ROWCOL nCol, const CGXStyle& style, BOOL bFloatOrFlood);<br />
<br />
GRID_API virtual void Draw(CDC* pDC, CRect rect, ROWCOL nRow, ROWCOL nCol, const CGXStyle& style, const CGXStyle* pStandardStyle);<br />
<br />
GRID_API void ImplementCellTips();<br />
};<br />
Now this returns:
error C2487: member of dll interface class may not be declared with dll interface
When using the macro:
#define DECLARE_CONTROL(class_name) \<br />
protected: \<br />
GRID_API static CGXControlClass* PASCAL _GetControlBaseClass(); \<br />
public: \<br />
static GX_DATA CGXControlClass ctrl##class_name; \<br />
GRID_API virtual CGXControlClass* GetControlClass() const; \<br />
<br />
#define IMPLEMENT_CONTROL(class_name, base_class_name) \<br />
CGXControlClass* PASCAL class_name::_GetControlBaseClass() \<br />
{ return CONTROL_CLASS(base_class_name); } \<br />
GX_DATADEF CGXControlClass class_name::ctrl##class_name = { \<br />
#class_name, &class_name::_GetControlBaseClass }; \<br />
CGXControlClass* class_name::GetControlClass() const \<br />
{ return &class_name::ctrl##class_name; } \<br />
<br />
DECLARE_CONTROL(vxtUISimpleButton)
So I tried not using dllimport ON the class but instead on every functions
Which returned this:
warning C4273 : inconsistent dll linkage
on the macro:
<br />
#define IMPLEMENT_CONTROL(class_name, base_class_name) \<br />
CGXControlClass* PASCAL class_name::_GetControlBaseClass() \<br />
{ return CONTROL_CLASS(base_class_name); } \<br />
GX_DATADEF CGXControlClass class_name::ctrl##class_name = { \<br />
#class_name, &class_name::_GetControlBaseClass }; \<br />
CGXControlClass* class_name::GetControlClass() const \<br />
{ return &class_name::ctrl##class_name; } \<br />
<br />
IMPLEMENT_CONTROL(vxtUISimpleButton, CGXStatic)
Which is present because (I think) that we defined this function:
virtual VXT_SIMPLE_BUTTON_SPEC vxtVoid Draw(CDC* pDC, CRect rect, ROWCOL nRow, ROWCOL nCol, const CGXStyle& style, const CGXStyle* pStandardStyle);
and the stingray class defined it this way:
GRID_API virtual void Draw(CDC* pDC, CRect rect, ROWCOL nRow, ROWCOL nCol, const CGXStyle& style, const CGXStyle* pStandardStyle);
Both are on dllImport
Any suggestion on how to "cleanly" remove the error and warning?
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I want to know how can i get the file of '.dll' of CxImage?when i load the CxImage,i cannot find the file.Thank you!
My Email is xhj131@163.com
jane
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Did you ask on that article?
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Yes,i asked about the CxImage.Do you know something about it?If you do,i hope you can help me.
I want to change the format of the image from ".jpg" to ".bmp"!
Thank you
Jane131
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If you want to convert jpg to bmp why you dont use of CImage class?
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