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You can use of WM_ENABLE or EnableWindow for enable or disbale
ListView_GetItemCount or LVM_GETITEMCOUNT for get number of items on a list view And I think when you start your program buttons must disable because listview doesnt have any items and when you insert a item you can enable buttons and when you use of LVM_DELETEITEM or ListView_DeleteItem you can check if count is 0 disable buttons.
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You don't notify the buttons of anything, you just enable/disable them as you deem necessary.
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I'm a newbi. And I'm learnning Visual C++. I have a problem about my Application, I want to use a API function "PostMessage" to send a message window to an Online Game such as "Hero Online".
I write a DLL, and use funtion API "PostMessage" to control text is succesful, but I'm do on Game progamer not to do.
Please! help me
wqweq
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‘PostMessage’ is one of the means by which you send messages (instructions) to different windows in the Windows OS and is not a means to send messages over the internet.
INTP
"Program testing can be used to show the presence of bugs, but never to show their absence."Edsger Dijkstra
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Thanks!
I'm write a DLL hook and send a message to a application Game a message keyboard. I want application Game to action.
wqweq
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hi is there any funcion to create radio button from program (like (CLabel*)Label->create())
Arise Awake Stop Not Till ur Goal is Reached.
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deeps_cute wrote: hi is there any funcion to create radio button from program
Use style BS_RADIOBUTTON while creating button.
CButton button;
button.Create(_T("Radio button"), WS_CHILD|WS_VISIBLE|BS_RADIOBUTTON,
CRect(10,40,100,70), pParentWnd, 1);
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how to specify the loactaion of radio button. i have to create it in my own locaiton
Arise Awake Stop Not Till ur Goal is Reached.
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Use of MoveWindowor SetWindowPos
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deeps_cute wrote: how to specify the loactaion of radio button.
Have you seen Create API? RECT parameter is for that purpose only.
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I read this article about calling conventions:
http://www.codeproject.com/cpp/calling_conventios_demystified.asp
Something is not clear for me:
1-) I see that function overloading is only possible with thiscall. Right? Is this true?
"Thiscall is the default calling convention for calling member functions of C++ classes"
I can set Visual C++ Compiler Options with /Gd, /Gr, /Gz (Calling Convention) . __cdecl, __fastcall, or __stdcall .
2-) But this doesnt affect C++ member class functions calling convention type, i mean thiscall. They are always thiscall. Right?
3-) In win32 programming i see all of functions declare with stdcall. So beacuse of that win32api is not object oriented. I mean can not use function overloading. But why didnt they design win32api with thiscall?
Can you please verify my conclusions. Am i wrong or right?
Thank you.
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sawerr wrote: Am i wrong or right?
Yes. C (stdcall) versus C++ (thiscall), they are not the same.
led mike
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sawerr wrote: But why didnt they design win32api with thiscall?
That would have been sweet for us C++ programmers, and .NET is a BIG step that direction, but I
imagine since the OS APIs need to be callable from any language (including non-OOP ones) they had
to use a common calling convention.
"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")
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"thiscall" is not a keyword, it means "the function has this as its first parameter even though it's not written that way". A member function can be __stdcall - when you write an implementation of a COM interface in C++, the methods are __stdcall (it's hidden in the STDMETHODIMP macro).
Function overloading is done by the compiler giving each overload different internal names. This is unrelated to calling conventions.
Most Win32 APIs use __stdcall (or as it was originally called, PASCAL). Only a few like wsprintf() use __cdecl. APIs can't be overloaded because that would break compat with Pascal and C and other languages that don't know about overloading or mangled names.
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Thanks for all answers.
Micheal Dunn you told me:
"Function overloading is done by the compiler giving each overload different internal names. This is unrelated to calling conventions."
Yes i tried a piece of code
#include <iostream><br />
using namespace std;<br />
<br />
class CRectangle {<br />
int x, y;<br />
public:<br />
void set_values (int,int);<br />
int _stdcall area () {return (x*y);}<br />
int _stdcall area (int x ) {cout << x; return 0;}<br />
};<br />
<br />
void CRectangle::set_values (int a, int b) {<br />
x = a;<br />
y = b;<br />
}<br />
<br />
int main () {<br />
CRectangle rect;<br />
rect.set_values (3,4);<br />
cout << "area: " << rect.area();<br />
rect.area(8);<br />
return 0;<br />
}
It works. I tried both _stdcall and _cdecl there is no problem.
But i dont understand here. Why do they write:
"For C calling convention (__cdecl): Function name is decorated by prefixing it with an underscore character '_' .
For Standard calling convention (__stdcall): Function name is decorated by prepending an underscore character and appending a '@' character and the number of bytes of stack space required."
For cdecl Compiler generate function name for area():
?area@CRectangle@@QAAHXZ
?area@CRectangle@@QAAHH@Z
So function name decoration information is not true for member functions. Because function names both 2 area func must be "_area". Right?
If function overloading is done by compiler why is there a specification for calling conventions? Why is there an information about function name decoration? VC++ doesnt obey this rule.
Can you please explain here please.
Thanks for answers
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The calling convention determines how the parameters are put on and cleaned off the stack. Overloading is done strictly by generating unique mangled names (that's what the funky-looking ?area@CRectangle... names are). The name decorating rules you quoted hold true for exported and non-overloaded functions. As soon as you introduce overloading, you get the long mangled names.
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I need to implement a window that is suitable for things like a combo box's dropdown window, or a menu.
- I want it to popup (be top most) with out recv'ing focus.
- I want it to ignore mouse activates
- I want it to be closed when a WM_LBUTTONUP is recv'd by the window, OR a WM_LBUTTONDOWN happens on ANY other window.
I have items 1 and 2 working fine. However I'm not sure of the best way to implement the third one. Is installing a windows hook the best way? If so, which hook type do I want? There is a specific mouse hook type, but it doesn't look your call back gets enough info - i.e. you can't tell if it's a mouse down, etc.
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Dear All;
I want to capture a screen shot of a web browser control (m_webBrowser) which is hosted in a dialog box.
Here is the code which i used to do that but its not working properly (ie. capturing other windows) !
<br />
RECT rc;<br />
LPOLEWINDOW pOWin = 0;<br />
HWND hWnd;<br />
m_webBrowser.GetControlUnknown()->QueryInterface(IID_IOleWindow, (LPVOID*)&pOWin);<br />
pOWin->GetWindow(&hWnd);<br />
HWND hwFirst = ::GetWindow( hWnd, GW_CHILD );<br />
HWND hwSecond = ::GetWindow( hwFirst, GW_CHILD );<br />
::GetWindowRect (hwSecond,&rc); <br />
HDC hDC = ::GetDC(0);<br />
HDC memDC = ::CreateCompatibleDC ( hDC );<br />
HBITMAP memBM = ::CreateCompatibleBitmap ( hDC, rc.right-rc.left, rc.bottom-rc.top );<br />
::SelectObject ( memDC, memBM );<br />
::BitBlt( memDC, rc.left, rc.top, rc.right-rc.left, rc.bottom-rc.top , hDC, 0, 0 , SRCCOPY );<br />
<br />
int size = 3 * ( (rc.right-rc.left) * (rc.bottom-rc.top) );<br />
BYTE *lpBits = new BYTE[size];<br />
<br />
::GetBitmapBits( memBM, size, lpBits );<br />
<br />
char* imageName;<br />
imageName =(char*)"2.jpg";<br />
SaveBitmap(imageName, memBM);
<br />
delete [] lpBits;<br />
::DeleteObject(memBM);<br />
::DeleteObject(memDC);<br />
::ReleaseDC( 0, hDC )<br />
Can someone please help me? Thank you
llp00na
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Maybe you need to use EnumChildWindows() instead of GetWindow() to find the appropriate window.
Just a guess since I have no idea what your window hierarchy looks like 
Mark
"Great job, team. Head back to base for debriefing and cocktails."
(Spottswoode "Team America")
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thanx for your reply;
I only have a dialog box (main window) which hosts the webBrowser control.
llp00na
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So where is this code being called from?
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
"Judge not by the eye but by the heart." - Native American Proverb
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The code is being called from a button click handler. (The user clicks a button "Grab Screen").
llp00na
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