vc6转2008的一些实践经验
1, 尽量不用"Using namespace".
2, 变量不初始化,然后赋值给其他变量的时候,debug下会弹出assert框.
3, 机器太慢,需要更好的配置.
4, 一些定义在2008的系统文件里已经有了.
enum SHIL
{
SHIL_LARGE = 0,
SHIL_SMALL = 1,
SHIL_EXTRALARGE = 2,
SHIL_SYSSMALL = 3,
SHIL_USER64,
};
SHIL_LARGE 已经在下面的文件里定义了
D:"Program Files"Microsoft SDKs"Windows"v6.0A"include"shellapi.h
#if (NTDDI_VERSION >= NTDDI_WINXP)
#define SHIL_LARGE 0 // normally 32x32
#define SHIL_SMALL 1 // normally 16x16
#define SHIL_EXTRALARGE 2
#define SHIL_SYSSMALL 3 // like SHIL_SMALL, but tracks system small icon metric correctly
#if (NTDDI_VERSION >= NTDDI_LONGHORN)
#define SHIL_JUMBO 4 // normally 256x256
#define SHIL_LAST SHIL_JUMBO
#else
#define SHIL_LAST SHIL_SYSSMALL
#endif // (NTDDI_VERSION >= NTDDI_LONGHORN)
#endif // (NTDDI_VERSION >= NTDDI_WINXP)
typedef enum _SEARCH_RESTR
{
SEARCH_ALL = 0,已经在下面的文件里定义了"D:"Program Files"Microsoft SDKs"Windows"v6.0A"include"winioctl.h"
SEARCH_CHAT,
SEARCH_FILE,
}SEARCH_RESTR;
解决办法:可以加一个namespace
5, warning C4996: '_itow': This function or variable may be unsafe. Consider using _itow_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
warning C4996: 'gmtime': This function or variable may be unsafe. Consider using gmtime_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
warning C4996: 'wcstok': This function or variable may be unsafe. Consider using wcstok_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS. See online help for details.
用_s版本的字符串处理函数更安全.
6, wchar_t作为c++的内部类型,不能用unsigned short代替.可以通过下面的开关来设置Whether treat wchar_t as Build-in Type.
Property --> C/C++ --> language --> Treat wchar_t as Build-in Type (NO).
7,return NCStr ( c_str() + nFirst, end() ); --> return NCStr ( c_str() + nFirst, length() - nFirst );
迭代器被封装了,所以这时候对CRangeT ( pointer pHead = 0, pointer pTail = 0 )和CRangeT ( pointer pHead, int nLen ),产生歧义,不知道该用哪个构造函数
8, enum EInsertAfter
{
e_iaFirst = TVI_FIRST,
e_iaLast = TVI_LAST,
e_iaSort = TVI_SORT,
};
-->
enum EInsertAfter
{
e_iaFirst = (int)TVI_FIRST,
e_iaLast = (int)TVI_LAST,
e_iaSort = (int)TVI_SORT,
};
#define TVI_ROOT ((HTREEITEM)(ULONG_PTR)-0x10000)
#define TVI_FIRST ((HTREEITEM)(ULONG_PTR)-0x0FFFF)
#define TVI_LAST ((HTREEITEM)(ULONG_PTR)-0x0FFFE)
#define TVI_SORT ((HTREEITEM)(ULONG_PTR)-0x0FFFD)
这几个值是指针,不是整型
9, _L("SettingFailed")) ). _L宏没有定义
10, 取函数指针 CXmpp::IQRoomList --> &CXmpp::IQRoomList
11, 函数必须有返回值，定义变量必须指定类型
12, error C2471: cannot update program database 'e:"projects"connect"c5_hz_2008"obj"release"triext"vc90.pdb
打补丁VS90-KB946040.exe.
13, CComQIPtr< IHTMLDocument2> pDoc;
…
MSHTML::IHTMLDocument3Ptr pDoc3 = NULL;
pDoc3 = pDoc; 这里2008不能通过编译,待研究.
14, time_t的定义,
localtime(&block_header.m_tDate);
vc6是32位的:
#ifndef _TIME_T_DEFINED
typedef long time_t; /* time value */
#define _TIME_T_DEFINED /* avoid multiple def's of time_t */
#endif
vc2008默认是64位:
#ifndef _TIME_T_DEFINED
#ifdef _USE_32BIT_TIME_T
typedef __time32_t time_t; /* time value */
#else
typedef __time64_t time_t; /* time value */
#endif
#define _TIME_T_DEFINED /* avoid multiple def's of time_t */
#endif
15, class CAniFrame : CWindowImpl< CAniFrame >
vc6默认是public继承
vc2008默认是private继承
17， 1>."res"Installer.exe.manifest : general error c1010070: Failed to load and parse the manifest. The system cannot find the path specified.
cause：Installer.exe.manifest不知道什么时候被加到resource里去了，删除即可。
18, typedef int (WINAPI* PTGetSSOTicketProc)(CSSOSink* pSink, HWND hParent, LPTSTR lpszSiteURL, BOOL bForce=FALSE/*illegal*/, LPVOID lpData=NULL/*illegal*/);
指向函数的指针不允许参数带默认值
19, For循环内部定义的变量作用域只在循环体内部.
for(int i=0;i<100;++i){}; j = i; (illegal)
int i; for(i<0;i<100;++i){}; j = i; (ok)
for(int i=0;i<100;i++){} for(i=0;i<100;i++){} (illegal)
for(int i=0;i<100;i++){} for(int i=0;i<100;i++){} (ok)
20, STL里的iterator 不要直接传递给指针。或把指针传给iterator
string s; char *p = s.begin(); (illegal)
string s; char *p = const_cast<char *>(s.c_str()); (ok)
//below example is illegal
map<LPCTSTR,LPTSTR>::iterator p = NULL;
p = m_mpUrlParams.find(lpTempID);
if(p != NULL){…}
//below example is right
map<LPCTSTR,LPTSTR>::iterator p = m_mpUrlParams.find(lpTempID);
if(p != m_mpUrlParams.end()){…}
21, 在你涉及到一个在 template（模板）中的 nested dependent type name（嵌套依赖类型名）的任何时候，你必须把单词 typename 放在紧挨着它的前面
CTLMap<KEY, ARG_KEY, VALUE, ARG_VALUE>::CAssoc*
CTLMap<KEY, ARG_KEY, VALUE, ARG_VALUE>::NewAssoc() -->typename CTLMap<KEY, ARG_KEY, VALUE, ARG_VALUE>::CAssoc*
CTLMap<KEY, ARG_KEY, VALUE, ARG_VALUE>::NewAssoc()
ex:
template<typename C> // this is valid C++
void print2nd(const C& container)
{
if (container.size() >= 2)
{
typename C::const_iterator iter(container.begin());
...
}
}
22, typedef 必须是public才能被外界访问到.
23, 在如下情况下必须明确指定模板参数
template< class TBase, class TWinTraits = CControlWinTraits >
class UI_EXPORT CTriSimplestWndImpl : public CWindowImpl<CTriSimplestWndImpl /*（illegal）*/, TBase, TWinTraits>
{
public:
BEGIN_MSG_MAP(CTriSimplestWndImpl)
END_MSG_MAP()
};
template< class TBase, class TWinTraits = CControlWinTraits >
class UI_EXPORT CTriSimplestWndImpl : public CWindowImpl<CTriSimplestWndImpl<TBase,TWinTraits>/*（OK）*/, TBase, TWinTraits>
{
public:
BEGIN_MSG_MAP(CTriSimplestWndImpl)
END_MSG_MAP()
};
…
50, 还有很多warning应该去关注,争取做到无warning
