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05.15.2008 at 07:53PM PDT, ID: 23407309
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5.2

Problem with CString to Long conversion

Asked by kakali in Windows MFC Programming, C++ Programming Language

Tags: , ,

Hi,

I am reading a value from the DB & then I have to write it in a file. After reading from the DB I am storing the value in a CString variable. I have to convert it into long to write in the file. But my problem when I am converting it to long the data value is changing. I do not want that the same string must be written in the file. Can you suggest how can I do that. Ok for clarification below is the example what I want:

CString strTemp = "1002007003297417";

The above value should be stored like following:
long lngTemp = 1002007003297417;

so that I can write in the file by the following way:
ch=((lngTemp>>24) & 0xff);
strPayload.SetAt(0,ch);
ch=((lngTemp>>16) & 0xff);
strPayload.SetAt(1,ch);
ch=((lngTemp>>8) & 0xff);
strPayload.SetAt(2,ch);
ch=(lngTemp & 0xff);
strPayload.SetAt(3,ch);

If I use       lngTemp=_atoi64(strTemp ); the value is changing to           "0xef7e7689"
If I use          lngTemp=atol(strTemp );  the value is changing to     "0x7fffffff"

but I want the value should be remain as it is : 1002007003297417

Please suggest how can I do it.

Regards,
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Keywords: Problem with CString to Long conversion
Title
1 Convert CString to Binary
2 CString to unsigned long conversion
3 CString & atol problem
4 CString --> Hex
5 CStrings
6 Type Conversion, CString to longbinar…
 
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Zones: Windows MFC Programming, C++ Programming Language
Tags: Microsoft, MFC, C++
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Solution Provided By: evilrix
Participating Experts: 3
Solution Grade: A
 
 
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20080716-EE-VQP-32 / EE_QW_2_20070628