About the MSDN NOTIFYICONDATA's cbSize member
- by KenC
Hi,
I am reading the NOTIFYICONDATA documentation in MSDN.
It says the NOTIFYICONDATA structure has a cbSize member should be set to the size of the structure, but NOTIFYICONDATA structure's size has different size in every Shell32.dll, so you should get the Shell32.dll version before setting cbSize.
The following quotes from MSDN:
If it is version 5.0 or later, initialize the cbSize member as follows.
nid.cbSize = sizeof(NOTIFYICONDATA);
Setting cbSize to this value enables all the version 5.0 and 6.0 enhancements. For earlier versions, the size of the pre-6.0 structure is given by the NOTIFYICONDATA_V2_SIZE constant and the pre-5.0 structure is given by the NOTIFYICONDATA_V1_SIZE constant. Initialize the cbSize member as follows.
nid.cbSize = NOTIFYICONDATA_V2_SIZE;
Using this value for cbSize will allow your application to use NOTIFYICONDATA with earlier Shell32.dll versions, although without the version 6.0 enhancements.
I found it a bit of vague, because 'sizeof(NOTIFYICONDATA)' has different value in Win98 (using Shell32.dll version 4.x), Win2K (version 5.0) and WinXP (version 6.0). How could it 'enable all version 5.0 and 6.0 enhancements'?
So I looked for the definition of NOTIFYICONDATA_V1_SIZE (source code as below), I see:
NOTIFYICONDATA_V1_SIZE is for Win 2K (doesn't include 2K)
NOTIFYICONDATA_V2_SIZE is for Win XP
NOTIFYICONDATA_V3_SIZE is for Vista
(not sure if I am right)
It's completely different from what MSDN says? and none for Win2K?
So, I am totaly confused right now. How should I set the cbSize member according to Shell32.dll version?
Could anybody help me...
Thanks in advance.
//= = = = = = = = ShellAPI.h = = = = = = = =
typedef struct _NOTIFYICONDATAA {
DWORD cbSize;
HWND hWnd;
UINT uID;
UINT uFlags;
UINT uCallbackMessage;
HICON hIcon;
#if (NTDDI_VERSION < NTDDI_WIN2K)
CHAR szTip[64];
#endif
#if (NTDDI_VERSION >= NTDDI_WIN2K)
CHAR szTip[128];
DWORD dwState;
DWORD dwStateMask;
CHAR szInfo[256];
union {
UINT uTimeout;
UINT uVersion; // used with NIM_SETVERSION, values 0, 3 and 4
} DUMMYUNIONNAME;
CHAR szInfoTitle[64];
DWORD dwInfoFlags;
#endif
#if (NTDDI_VERSION >= NTDDI_WINXP)
GUID guidItem;
#endif
#if (NTDDI_VERSION >= NTDDI_VISTA)
HICON hBalloonIcon;
#endif
} NOTIFYICONDATAA, *PNOTIFYICONDATAA;
typedef struct _NOTIFYICONDATAW {
DWORD cbSize;
HWND hWnd;
UINT uID;
UINT uFlags;
UINT uCallbackMessage;
HICON hIcon;
#if (NTDDI_VERSION < NTDDI_WIN2K)
WCHAR szTip[64];
#endif
#if (NTDDI_VERSION >= NTDDI_WIN2K)
WCHAR szTip[128];
DWORD dwState;
DWORD dwStateMask;
WCHAR szInfo[256];
union {
UINT uTimeout;
UINT uVersion; // used with NIM_SETVERSION, values 0, 3 and 4
} DUMMYUNIONNAME;
WCHAR szInfoTitle[64];
DWORD dwInfoFlags;
#endif
#if (NTDDI_VERSION >= NTDDI_WINXP)
GUID guidItem;
#endif
#if (NTDDI_VERSION >= NTDDI_VISTA)
HICON hBalloonIcon;
#endif
} NOTIFYICONDATAW, *PNOTIFYICONDATAW;
#define NOTIFYICONDATAA_V1_SIZE FIELD_OFFSET(NOTIFYICONDATAA, szTip[64])
#define NOTIFYICONDATAW_V1_SIZE FIELD_OFFSET(NOTIFYICONDATAW, szTip[64])
#ifdef UNICODE
#define NOTIFYICONDATA_V1_SIZE NOTIFYICONDATAW_V1_SIZE
#else
#define NOTIFYICONDATA_V1_SIZE NOTIFYICONDATAA_V1_SIZE
#endif
#define NOTIFYICONDATAA_V2_SIZE FIELD_OFFSET(NOTIFYICONDATAA, guidItem)
#define NOTIFYICONDATAW_V2_SIZE FIELD_OFFSET(NOTIFYICONDATAW, guidItem)
#ifdef UNICODE
#define NOTIFYICONDATA_V2_SIZE NOTIFYICONDATAW_V2_SIZE
#else
#define NOTIFYICONDATA_V2_SIZE NOTIFYICONDATAA_V2_SIZE
#endif
#define NOTIFYICONDATAA_V3_SIZE FIELD_OFFSET(NOTIFYICONDATAA, hBalloonIcon)
#define NOTIFYICONDATAW_V3_SIZE FIELD_OFFSET(NOTIFYICONDATAW, hBalloonIcon)
#ifdef UNICODE
#define NOTIFYICONDATA_V3_SIZE NOTIFYICONDATAW_V3_SIZE
#else
#define NOTIFYICONDATA_V3_SIZE NOTIFYICONDATAA_V3_SIZE
#endif
(Seems like the code doesn't look good on the web site, but it from ShellAPI.h, all the same)
