MS VisC++ 2010 express：突然項目不再看到頭文件

Question

這可能很難解釋。我一直在使用MS VisC++ 2010 express開發一個程序大約一個月。我沒有遇到任何奇怪的問題，並準備第100次構建我的項目，突然間，許多.cpp文件似乎與.h文件的聯繫不密切。例如，在主函數中，幾周前創建並使用的對象突然在它們下面出現紅線，語法錯誤「theClass is undefined」。這適用於iostream，因此突然cout未定義。我不知道發生了什麼事。一秒鐘之後，所有外部頭文件和庫在IDE的眼中突然消失了。在.cpp文件，當我宣佈class constructor

//initializes a poker game 
aPokerGame::aPokerGame(void) 
{ 
    stopPlaying = 'n';   
} 

我下得類名aPokerGame行，這錯誤是「must be a class or a namespace name」。這不是如果.h文件消失會發生什麼？其實並非所有的.cpp文件都有這個問題，只有一些。其他有像「沒有默認構造函數存在類」 std::basic_ostream<wchar...在他們真正奇怪的錯誤」。所有這些錯誤出現在天空中。

頭文件看起來不錯。雖然他們中的一個有‘Error: expected a declarationPrivate:‘標題’下的’ ！爲私有成員

請幫

以下是編譯錯誤示例：

1>------ Build started: Project: firstProj, Configuration: Debug Win32 ------ 1> userPlayer.cpp 1>c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\userplayer.h(9): error C2504: 'Player' : base class undefined 1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\iostream(10): error C2059: syntax error : 'namespace' 1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\iostream(10): error C2334: unexpected token(s) preceding '{'; skipping apparent function body 1>c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\userplayer.cpp(8): error C3254: 'Player' : class contains explicit override '{ctor}' but does not derive from an interface that contains the function declaration 1>c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\userplayer.cpp(8): error C2838: '{ctor}' : illegal qualified name in member declaration 1>c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\userplayer.cpp(8): error C2535: 'Player::Player(void)' : member function already defined or declared 1>
c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\player.h(18) : see declaration of 'Player::Player' 1>c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\userplayer.cpp(13): error C3254: 'Player' : class contains explicit override '{dtor}' but does not derive from an interface that contains the function declaration 1>c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\userplayer.cpp(13): error C2838: '{dtor}' : illegal qualified name in member declaration 1>c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\userplayer.cpp(13): error C2535: 'Player::~Player(void)' : member function already defined or declared 1>
c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\player.h(19) : see declaration of 'Player::~Player' 1>c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\userplayer.cpp(18): error C3254: 'Player' : class contains explicit override 'userBets' but does not derive from an interface that contains the function declaration 1>c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\userplayer.cpp(18): error C2838: 'userBets' : illegal qualified name in member declaration 1>c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\userplayer.cpp(38): fatal error C1075: end of file found before the left brace '{' at 'c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\player.h(12)' was matched 1> pokerRound.cpp 1>c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\npcplayer.h(9): error C2504: 'Player' : base class undefined 1>c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\userplayer.h(9): error C2504: 'Player' : base class undefined 1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\iostream(10): error C2059: syntax error : 'namespace' 1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\iostream(10): error C2334: unexpected token(s) preceding '{'; skipping apparent function body 1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\time.h(35): error C2059: syntax error : 'string' 1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\time.h(35): error C2334: unexpected token(s) preceding '{'; skipping apparent function body 1>c:\users\bn\dropbox\myprojects\mysoftware\c++\firstproj\firstproj\pokerround.cpp(16): error C2059: syntax error : 'namespace'

Answer 1

也許你缺少的一類definiti後分號或者類似於頭文件中的一些文件，這些文件包含在一些標準頭文件之上的其他文件中，這使得一切都變得混亂起來，編譯器會報告錯誤，因爲您忘記了一條小東西。

仔細檢查每個頭文件的語法，查找不匹配的圓括號或大括號，並確保在需要的地方使用分號。