| 最近兩周，在做一個項目的移植，大部分時間是比較幸運的，大部分的API都被支持，多是一些VS2005語法要求更為嚴格后的一些常見錯誤，另外就是CE對完成例程的不支持，改為Select模型也就可以了，再就是ARM CPU平臺下常見的內(nèi)存對齊問題和據(jù)說也是常見的模板的兼容性問題。總的來說還是比較幸運的。
在此中間有兩個小的問題，一個是WinCE下沒有Ini文件的操作API，再就是沒有UuidCreate函數(shù)創(chuàng)建通用的GUID。這兩個問題都是比較普通常見的操作，于是開始我沒有太重視，以為隨便一搜索網(wǎng)上就會有一堆的現(xiàn)成代碼可用，因為太普通了。但事實證明我是錯誤的，至少ini操作比較完善的工具函數(shù)我就沒有找到合適的，GUID的創(chuàng)建倒是有個C#的版本，但C版本也沒有見到，后來想，可能是目前做手機開發(fā)的資源和人還是較少吧。
后來就不得不放棄自己懶惰的想法了，沒辦法，既然沒有就自己實現(xiàn)了。實際上我還是傾向于使用現(xiàn)成代碼的，因為代碼雖然簡單不多，但自己寫的話測試和調(diào)試還是有些費事，要保證可靠性還可能要考慮到一些自己可能會有些地方考慮不到，綜合別人的代碼可以彌補這些不足?，F(xiàn)在我花了些時間實現(xiàn)，并基本詳細測試過了，所以也就拿出來共享一下，以讓后面用到的人能夠比我現(xiàn)在能省事些，畢竟一直以來大都是從互聯(lián)網(wǎng)拿，自己給予的太少，如果都和我這樣，估計就比較可怕了，也該拿出些東西來了，否則心里老是不安。
首先是創(chuàng)建GUID，這個主要的一點是盡可能和WinAPI的特性保持一致，否則可能會有重復的風險，這是一個難點，所以主要是要參考Rfc和MSDN，代碼如下：
//------------------------------------------------------------------------------
// Win CE下生成Guid的文件：由于Win CE下不支持UuidCreate函數(shù)，因此創(chuàng)建Uuid需要
// 自己實現(xiàn)，僅僅用隨機數(shù)的方式不能保證同其它系統(tǒng)（PC）下的兼容性。從MSDN上找到
// 了Guid的實現(xiàn)算法，據(jù)文檔中描述，算法保持了同PC下的基本一致性。
//
// 參考：http://msdn2.microsoft.com/en-us/library/aa446557.aspx
//
//------------------------------------------------------------------------------
#pragma once
#include <wincrypt.h>
class PocketGuid
{
private:
// One to three bits of the clock sequence section are used to define the variant, or layout,
// of the GUID. Windows and the PocketGuid class generate variant type 2 GUIDs.
enum GuidVariant
{
ReservedNCS = 0x00,
Standard = 0x02,
ReservedMicrosoft = 0x06,
ReservedFuture = 0x07
};
// The upper four bits of the timestamp section contain the GUID's version that specifies the content of
// each section. Before Windows 2000, the CoCreateGuid function generated version 1 GUIDs. With Windows 2000,
// Microsoft switched to version 4 GUIDs, since embedding the MAC address was viewed as a security risk.
// The PocketGuid class also generates version 4 GUIDs.
enum GuidVersion
{
TimeBased = 0x01,
Reserved = 0x02,
NameBased = 0x03,
Random = 0x04
};
class Const
{
// number of bytes in guid
public:
static const int ByteArraySize = 16;
// multiplex variant info
static const int VariantByte = 8;
static const int VariantByteMask = 0x3f;
static const int VariantByteShift = 6;
// multiplex version info
static const int VersionByte = 7;
static const int VersionByteMask = 0x0f;
static const int VersionByteShift = 4;
};
public:
static HRESULT CreateGuid (GUID & guid)
{
HCRYPTPROV hCryptProv = NULL;
HRESULT hr = S_OK;
// holds random bits for guid
BYTE * bits = new BYTE[Const::ByteArraySize];
if (bits == NULL)
{
hr = E_OUTOFMEMORY;
goto ExitHere;
}
// get crypto provider handle
if (!CryptAcquireContext (&hCryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))
{
hr = HRESULT_FROM_WIN32 (GetLastError ());
goto ExitHere;
}
// generate a 128 bit (16 byte) cryptographically random number
if (!CryptGenRandom (hCryptProv, Const::ByteArraySize, bits))
{
hr = HRESULT_FROM_WIN32 (GetLastError ());
goto ExitHere;
}
// set the variant
bits[Const::VariantByte] &= Const::VariantByteMask;
bits[Const::VariantByte] |= ((int)Standard << Const::VariantByteShift);
// set the version
bits[Const::VersionByte] &= Const::VersionByteMask;
bits[Const::VersionByte] |= ((int)Random << Const::VersionByteShift);
memcpy (&guid, bits, sizeof (GUID));
ExitHere:
if (hCryptProv != NULL)
CryptReleaseContext (hCryptProv, 0);
if (bits != NULL)
delete [] bits;
return hr;
};
};
ini文件操作相關(guān)函數(shù)，根據(jù)我的需要，只實現(xiàn)了4個，代碼如下：
#ifdef UNDER_CE //=======================================================================================================
//
// WinCE下不支持ini文件操作的API，根據(jù)MSDN的幫助和Win32下測試的API的特性，模擬實現(xiàn)。測試發(fā)現(xiàn)API在不同
// 系統(tǒng)下的特性不完全一致，但區(qū)別不大，這里實現(xiàn)的是大部分XP系統(tǒng)下的特性
//
//======================================================================================================= #define GetPrivateProfileSectionNames GetMyProfileSectionNames
#define GetPrivateProfileSection GetMyProfileSection
#define WritePrivateProfileString WriteMyProfileString
#define GetPrivateProfileString GetMyProfileString BOOL WriteMyProfileString (LPCTSTR section, LPCTSTR keyName, LPCTSTR value, LPCTSTR filePath)
{
CIniFile iniFile;
CString str = _T (""); CString strSection = section;
CString strKeyName = keyName;
CString strValue = value; if (!iniFile.Open (filePath, CFile::modeRead | CFile::modeCreate | CFile::modeNoTruncate))
return FALSE; CStringArray strArray;
while (iniFile.ReadLine (str))
{
strArray.Add (str);
}
iniFile.Close (); BOOL foundKey = FALSE;
BOOL addValue = FALSE;
for (int i = 0; i < strArray.GetSize (); i++)
{
str = strArray[i];
str = str.TrimLeft ().TrimRight ();
if (str.GetAt (0) == ',' || str.GetAt (0) == '#')
continue; if (!foundKey)
{
if (str.GetAt (0) == '[' && str.Right (str.GetLength () - 1).TrimLeft ().Find (strSection) == 0)
{
foundKey = TRUE;
if (keyName == NULL)
{
strArray.RemoveAt (i);
i --;
}
}
}
else
{
// enter new key's area
if (str.GetAt (0) == '[')
{
if (keyName != NULL)
{
strArray.InsertAt (i, strKeyName + _T ("=") + strValue + _T ("\r"));
addValue = TRUE;
}
break;
}
else if (keyName == NULL)
{
strArray.RemoveAt (i);
i --;
}
else if (str.Find (strKeyName) == 0)
{
CString rightValue = str.Right (str.GetLength () - strKeyName.GetLength ()).TrimLeft ();
if (rightValue.Find (_T ("=")) == 0)
{
if (value != NULL)
{
strArray[i] = strKeyName + _T ("=") + strValue + _T ("\r");
addValue = TRUE;
}
else
{
strArray.RemoveAt (i);
}
break;
}
}
}
}
if (!addValue && keyName != NULL && value != NULL)
{
if (!foundKey)
strArray.Add (_T ("[") + strSection + _T ("]") + _T ("\r"));
strArray.Add (strKeyName + _T ("=") + strValue + _T ("\r"));
} if (!iniFile.Open (filePath, CFile::modeCreate | CFile::modeWrite))
return FALSE; for (int i = 0; i < strArray.GetSize (); i++)
{
iniFile.WriteString (strArray[i]);
}
iniFile.Close ();
return TRUE;
} void GetMyProfileString (LPCTSTR section, LPCTSTR keyName, LPCTSTR defaultStr, CString & returnedStr, LPCTSTR fileName)
{
CString strSection = section;
CString strKeyName = keyName;
returnedStr = defaultStr;
if (strSection == _T ("") || strKeyName == _T (""))
return; CIniFile iniFile;
CString str = _T (""); if (!iniFile.Open (fileName, CFile::modeRead))
return; BOOL foundKey = FALSE;
while (iniFile.ReadLine (str))
{
str = str.Trim ();
if (str.GetAt (0) == ',' || str.GetAt (0) == '#')
continue; if (!foundKey)
{
if (str.GetAt (0) == '[' && str.Right (str.GetLength () - 1).TrimLeft ().Find (strSection) == 0)
foundKey = TRUE;
}
else
{
// enter new key's area
if (str.GetAt (0) == '[')
{
foundKey = FALSE;
break;
}
else if (str.Find (strKeyName) == 0)
{
CString rightValue = str.Right (str.GetLength () - strKeyName.GetLength ()).TrimLeft ();
if (rightValue.Find (_T ("=")) == 0)
{
returnedStr = rightValue.Right (rightValue.GetLength () - 1).Trim ();
break;
}
}
}
}
iniFile.Close ();
}
DWORD GetMyProfileString (LPCTSTR section, LPCTSTR keyName, LPCTSTR defaultStr, LPTSTR returnedString, DWORD size, LPCTSTR filePath)
{
if (returnedString == NULL || size == 0)
return 0;
if (size == 1)
{
returnedString[0] = '\0';
return 0;
} CString str = _T ("");
GetMyProfileString (section, keyName, defaultStr, str, filePath); DWORD available = size - 1; if (available < (DWORD)str.GetLength ())
str = str.Left (available); wcscpy_s (returnedString, size, str.GetBuffer ());
int allocSize = str.GetLength (); returnedString[allocSize + 1] = '\0';
return allocSize;
} DWORD GetMyProfileSectionNames (LPTSTR returnBuffer, DWORD size, LPCTSTR fileName)
{
if (returnBuffer == NULL || size == 0)
return 0;
if (size <= 2)
{
returnBuffer[0] = '\0';
return 0;
} CIniFile iniFile;
if (!iniFile.Open (fileName, CFile::modeRead))
{
returnBuffer[0] = '\0';
return 0;
} CString str = _T ("");
DWORD allocSize = 0;
DWORD available = size - 1;
while (iniFile.ReadLine (str) && available > 1)
{
str = str.Trim ();
if (str.GetAt (0) == ',' || str.GetAt (0) == '#')
continue; if (str.GetAt (0) == '[')
{
CString section = str.Right (str.GetLength () - 1).Trim ();
int pos = section.Find (_T ("]"));
if (pos >= 0)
section = section.Left (pos).Trim (); if (available < (DWORD)section.GetLength ())
section = section.Left (available - 1); wcscpy_s (returnBuffer + allocSize, size - allocSize, section.GetBuffer ());
int curAlloc = section.GetLength () + 1;
allocSize += curAlloc;
ASSERT (available >= (DWORD)curAlloc);
available -= curAlloc;
}
}
returnBuffer[allocSize] = '\0';
return allocSize > 1 ? allocSize -1 : 0;
} DWORD GetMyProfileSection (LPCTSTR section, LPTSTR returnedString, DWORD size, LPCTSTR fileName)
{
if (returnedString == NULL || size == 0 || section == NULL)
return 0; if (size <= 2)
{
returnedString[0] = '\0';
return 0;
} CIniFile iniFile;
if (!iniFile.Open (fileName, CFile::modeRead))
{
returnedString[0] = '\0';
return 0;
}
CString strSection = section; CString str = _T ("");
DWORD allocSize = 0;
DWORD available = size - 1;
BOOL foundKey = FALSE;
while (iniFile.ReadLine (str) && available > 1)
{
str = str.Trim ();
if (str.GetAt (0) == ',' || str.GetAt (0) == '#')
continue; if (!foundKey)
{
if (str.GetAt (0) == '[' && str.Right (str.GetLength () - 1).TrimLeft ().Find (strSection) == 0)
foundKey = TRUE;
}
else
{
// enter new key's area
if (str.GetAt (0) == '[')
{
foundKey = FALSE;
break;
} CString entry = _T ("");
int pos = str.Find (_T ("="));
if (pos >= 0)
{
CString left = str.Left (pos).Trim ();
CString right = str.Right (str.GetLength () - pos - 1).Trim ();
entry = left + _T ("=") + right;
}
else
{
entry = str;
} if (available < (DWORD)entry.GetLength ())
entry = entry.Left (available - 1); wcscpy_s (returnedString + allocSize, size - allocSize, entry.GetBuffer ());
int curAlloc = entry.GetLength () + 1;
allocSize += curAlloc;
ASSERT (available >= (DWORD)curAlloc);
available -= curAlloc;
}
}
returnedString[allocSize] = '\0';
return allocSize > 1 ? allocSize -1 : 0;
} //=======================================================================================================
#endif //UNDER_CE 這里用到了讀文件的函數(shù)，每次讀一行，開始使用了CStdioFile的ReadString，PC下已經(jīng)測試通過了，但真正到了手機上發(fā)現(xiàn)受騙了，呵呵，手機上的ReadString的特性變了，具體可以查看MFC中的源碼，粗略讀了一下它的代碼，似乎CE下ReadString的特性是：如果文件大小不足128，則全部讀出，否則只讀一行；也就是可能超過一行，所以不符合需求了。于是簡單的自己寫了一個能支持真正讀一行的類：
#ifdef UNDER_CE
class CIniFile : public CStdioFile
{
public:
CIniFile() {}
~CIniFile() {}
BOOL ReadLine (CString& rString)
{
ASSERT_VALID(this); ULONGLONG nStartPosition = CFile::GetPosition();
bool fEndOfFile = false; rString = _T(""); // empty string without deallocating
const int nMaxSize = 128;
LPTSTR lpsz = rString.GetBuffer(nMaxSize);
int nLen = 0;
for (;;)
{
// Reading is not buffered, just let the internal OS buffer handle it.
UINT nRead = CFile::Read(
reinterpret_cast<void*>(lpsz),
(nMaxSize)*sizeof(*lpsz) // convert from characters to bytes
); nRead /= sizeof(*lpsz); // convert from bytes to characters if(nRead != nMaxSize)
{
// reached end of file, terminate the string here.
fEndOfFile = true;
//nLen = nRead;
//break;
} // check for end of line character
for(nLen = 0 ; nLen < static_cast<int>(nRead) && lpsz[nLen] != '\n' ; ++nLen)
; if(lpsz[nLen]=='\n')
{
// nLen is correct location of end of line, which should be replaced with a null terminator
fEndOfFile = false;
break;
} if (fEndOfFile)
{
nLen = nRead;
break;
} rString.ReleaseBuffer(); nLen = rString.GetLength();
lpsz = rString.GetBuffer(nMaxSize + nLen) + nLen;
} lpsz[nLen] = '\0';
rString.ReleaseBuffer(); nLen = rString.GetLength(); // Reset the file pointer to the position immediately after the end of line character
if(!fEndOfFile)
{
CFile::Seek(nStartPosition + (nLen + 1) * sizeof(TCHAR), begin);
}
return nLen != 0;
}
};
#endif | 
