用VC6.0制作对话框程序，想用 弹出气球 提示时，编译总出现以下错误：
error C2065: 'NIIF_INFO' : undeclared identifier
D:\login\loginDlg.cpp(918) : error C2065: 'NIF_INFO' : undeclared identifier
D:\login\loginDlg.cpp(918) : error C2065: 'NIIF_ERROR' : undeclared identifier
D:\login\loginDlg.cpp(919) : error C2039: 'uTimeout' : is not a member of '_NOTIFYICONDATAA'
d:\program files\microsoft visual studio\vc98\include\shellapi.h(500) : see declaration of '_NOTIFYICONDATAA'
D:\login\loginDlg.cpp(920) : error C2039: 'dwInfoFlags' : is not a member of '_NOTIFYICONDATAA'
d:\program files\microsoft visual studio\vc98\include\shellapi.h(500) : see declaration of '_NOTIFYICONDATAA'
D:\login\loginDlg.cpp(921) : error C2039: 'szInfo' : is not a member of '_NOTIFYICONDATAA'
d:\program files\microsoft visual studio\vc98\include\shellapi.h(500) : see declaration of '_NOTIFYICONDATAA'
D:\login\loginDlg.cpp(922) : error C2039: 'szInfoTitle' : is not a member of '_NOTIFYICONDATAA'
d:\program files\microsoft visual studio\vc98\include\shellapi.h(500) : see declaration of '_NOTIFYICONDATAA'
MD5.cpp
setDlg.cpp
Generating Code...
Error executing cl.exe.
login.exe - 7 error(s), 0 warning(s)
这个问题主要是由于SHELLAPI.H比较旧了，我们需要更改一下这个文件。找到VC++6.0的安装目录，我的是装在了D盘，即："D:\Program Files\Microsoft Visual Studio\VC98\include\,到这个目录下后，你可以发现许多.h文件。找到SHELLAPI.H，然后用记事本打开，用查找命令，找到“//// Tray notification definitions”这一行，大概在记事本第504行。然后再找到“//// End Tray Notification Icons”这一行，把这两行之间的内容全部注释掉或者删除，包括那两行，再重新粘贴上这些内容：
//// Tray notification definitions
////
typedef struct _NOTIFYICONDATAA {
DWORD cbSize;
HWND hWnd;
UINT uID;
UINT uFlags;
UINT uCallbackMessage;
HICON hIcon;
#if (_WIN32_IE < 0x0500)
CHAR szTip[64];
#else
CHAR szTip[128];
#endif
#if (_WIN32_IE >= 0x0500)
DWORD dwState;
DWORD dwStateMask;
CHAR szInfo[256];
union {
UINT uTimeout;
UINT uVersion;
} DUMMYUNIONNAME;
CHAR szInfoTitle[64];
DWORD dwInfoFlags;
#endif
#if (_WIN32_IE >= 0x600)
GUID guidItem;
#endif
} NOTIFYICONDATAA, *PNOTIFYICONDATAA;
typedef struct _NOTIFYICONDATAW {
DWORD cbSize;
HWND hWnd;
UINT uID;
UINT uFlags;
UINT uCallbackMessage;
HICON hIcon;
#if (_WIN32_IE < 0x0500)
WCHAR szTip[64];
#else
WCHAR szTip[128];
#endif
#if (_WIN32_IE >= 0x0500)
DWORD dwState;
DWORD dwStateMask;
WCHAR szInfo[256];
union {
UINT uTimeout;
UINT uVersion;
} DUMMYUNIONNAME;
WCHAR szInfoTitle[64];
DWORD dwInfoFlags;
#endif
#if (_WIN32_IE >= 0x600)
GUID guidItem;
#endif
} NOTIFYICONDATAW, *PNOTIFYICONDATAW;
#ifdef UNICODE
typedef NOTIFYICONDATAW NOTIFYICONDATA;
typedef PNOTIFYICONDATAW PNOTIFYICONDATA;
#else
typedef NOTIFYICONDATAA NOTIFYICONDATA;
typedef PNOTIFYICONDATAA PNOTIFYICONDATA;
#endif // UNICODE
#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
#if (_WIN32_IE >= 0x0500)
#define NIN_SELECT (WM_USER + 0)
#define NINF_KEY 0x1
#define NIN_KEYSELECT (NIN_SELECT | NINF_KEY)
#endif
#if (_WIN32_IE >= 0x0501)
#define NIN_BALLOONSHOW (WM_USER + 2)
#define NIN_BALLOONHIDE (WM_USER + 3)
#define NIN_BALLOONTIMEOUT (WM_USER + 4)
#define NIN_BALLOONUSERCLICK (WM_USER + 5)
#endif
#define NIM_ADD 0x00000000
#define NIM_MODIFY 0x00000001
#define NIM_DELETE 0x00000002
#if (_WIN32_IE >= 0x0500)
#define NIM_SETFOCUS 0x00000003
#define NIM_SETVERSION 0x00000004
#define NOTIFYICON_VERSION 3
#endif
#define NIF_MESSAGE 0x00000001
#define NIF_ICON 0x00000002
#define NIF_TIP 0x00000004
#if (_WIN32_IE >= 0x0500)
#define NIF_STATE 0x00000008
#define NIF_INFO 0x00000010
#endif
#if (_WIN32_IE >= 0x600)
#define NIF_GUID 0x00000020
#endif
#if (_WIN32_IE >= 0x0500)
#define NIS_HIDDEN 0x00000001
#define NIS_SHAREDICON 0x00000002
// says this is the source of a shared icon
// Notify Icon Infotip flags
#define NIIF_NONE 0x00000000
// icon flags are mutually exclusive
// and take only the lowest 2 bits
#define NIIF_INFO 0x00000001
#define NIIF_WARNING 0x00000002
#define NIIF_ERROR 0x00000003
#define NIIF_ICON_MASK 0x0000000F
#if (_WIN32_IE >= 0x0501)
#define NIIF_NOSOUND 0x00000010
#endif
#endif
SHSTDAPI_(BOOL) Shell_NotifyIconA(DWORD dwMessage, PNOTIFYICONDATAA lpData);
SHSTDAPI_(BOOL) Shell_NotifyIconW(DWORD dwMessage, PNOTIFYICONDATAW lpData);
#ifdef UNICODE
#define Shell_NotifyIcon Shell_NotifyIconW
#else
#define Shell_NotifyIcon Shell_NotifyIconA
#endif // !UNICODE
////
//// End Tray Notification Icons
////
关闭VC，重新打开后再编译试试。
如果问题仍然存在，可以选择组建->全部组建。
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