This sounds to me like a structure packing / alignment problem. If you defined your
app info type in Codewarrior and allocated it with your device application, the
packing size is 2. So, for example:
typedef struct { UInt8 junk; UInt32 moreJunk } MyType;
has size 6. (There is a SINGLE padding byte added after junk). However if you do the
same definition in VC on a desktop, the packing size is 4 and your structure will have
size 8. Either explicitly pad the device to 4-byte boundaries, or, more rationally,
use #pragma pack for your desktop code to override the desktop's default packing.
-bob mckenzie, plamsource pdx
-----Original Message-----
From: Guanghe Pan [mailto:snow_rive@;yahoo.com]
Sent: Sunday, October 20, 2002 11:52 PM
To: Palm Developer Forum
Subject: Conduit - App Info block data error
I have a conduit and get the following problem when I
try to read app Info data from Handheld.
The following structure are app Info structure defined
inside both Palm application and conduit application.
typedef struct
{
WORD renamedCategories;
CHAR categoryLabels[16][16];
BYTE categoryUniqIDs[16];
BYTE lastUniqID;
BYTE reserved1;
WORD reserved2;
BYTE sortOrder;
WORD MyWord1;
BOOL MyBOOL1;
DWORD MyDWORD1;
DWORD MyDWORD2;
WORD MyWordArray1[10][5];
BYTE MyByteArray1[20];
CHAR MyString1[20][16];
} MyAppInfoType, *MyAppInfoPtr;
Inside the following function
SynchronizeAppInfoBlock(CDbGenInfo& dbInfo,
CBaseTable& rTable, eSyncTypes syncType, eFirstSync
firstSync)
I defined
MyAppInfoPtr pAppInfo;
dbinfo contains App Info data from handheld, and then
get I fill pAppInfo
pAppInfo = (MyAppInfoPtr) dbInfo.m_pBytes;
Then
tempDWord = pAppInfo->MyDWORD1;
tempDWord = SwapDWordToIntel(tempDWord);
I can get correct result
but
tempDWord = pAppInfo->MyDWORD2;
tempDWord = SwapDWordToIntel(tempDWord);
the result is incorrect
Also MyByteArray1 is incorrect
the correct results should be:
MyByteArray1[0] = 0;
MyByteArray1[1] = 1;
MyByteArray1[2] = 2;
...
MyByteArray1[17] = 17;
MyByteArray1[18] = 18;
MyByteArray1[19] = 19;
But What I got are:
MyByteArray1[0] = 2;
MyByteArray1[1] = 3;
MyByteArray1[2] = 4;
...
MyByteArray1[17] = 19;
MyByteArray1[18] = 'A';
MyByteArray1[19] = 'd';
MyString1 is incorrect too,
The correct results are:
MyString1[0] = "Address"
MyString1[1] = "Phone"
...
But I got:
MyString1[0] = "dress"
MyString1[1] = "one"
...
It seems everything was shifted down 2 bytes.
'A' and 'd' in MyString1[0] was move up to
MyBytesArray1[18] and MyByteArray1[19]
Any Problem here?
I also try to read the app info data as follows
pBuff = (char*)dbInfo.m_pBytes;
and then read each structur member and move the
pointer to the next member, but get the same problem
Thanks for your help.
-Rocky
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