Converting/packing a string of 01010101 to a byte

Hi everyone,
-I need to create a function that will take a string of 1's and 0's.
-The string length will be from 1 to 8, if the length of the string is below 8, it will add trailing 0's (to make 8 bits)
ie. packStrToByte("1011") would return 176 (10110000)
I want to pack that string in a byte so I can write it to an BufferedOuputStream with the method write(int b), where b is a byte.
Example of idea:
packStrToByte("00110001") would return a byte value of 49
ous.write(packStrToByte("00110001") ) would write 1 byte with value 49
I hope i made myself clear!, I really struggle with bit packing....and on top of that i start with a string(which I cannot really implement otherwise)!
Thanks
Patrick Picard

String s = ...;
int val = 0;
for (int i = 0; i < s.length(); i++) {
 int j = (s.length() - 1) - i;
 if (s.charAt(i) == '1') {
 val += (int) Math.pow(2, j);
}Then just cast val to a byte.
However, if you are using Strings to represent bits, chances are something isn't quite right.

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Try something like this:
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Message Edited by altenbach on 03-14-2010 06:40 PM
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#include "windows.h"
struct teststrct{
const char* test;
struct teststrct testinstance;
typedef struct {
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Thank you so much for your response, Greg. However, I still have problem after making
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> The LStrPrintf example works correctly with the "test" string literal because
> tempCStr= "test"; assigns the pointer tempCStr to point to the buffer containing
> "text". Calling strcpy to move any string to tempStr will cause
> problems because it is copying the string to an uninitialized pointer,
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> call, the damage is already done.
>
> In the moveblock case, the code:
> tempCStr = (char *)&testinstance.test; //since strcpy didn't work, I
> used this way to try to copy the const char* to char*.
>
> doesn't copy the buffer, it just changes a pointer, tempCStr to point to
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>
> I believe the reason that LV cannot see the returned string is that the
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> Again, I'm not looking at any documentation, but I believe that you may
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> the string passed into the CIN, and it should be set to len before returning.
>
> Greg McKaskle
>
> > struct teststrct{
> > ...
> > const char* test;
> > ...
> > };
> >
> > struct teststrct testinstance;
> >
> > typedef struct {
> > ...
> > LStrHandle test
> > ...
> > } TD1;
> >
> > CIN MgErr CINRun(TD1 *testcluster, LVBoolean *Error) {
> >
> > char *tempCStr = NULL;
> >
> > ...
> >
> > strcpy(tempCStr, testinstance.test); // this would cause LabVIEW crash!
> > LStrPrintf(testcluster->test, (CStr) "%s", tempCStr);
> > // but if I assigned tempCStr as tempCStr = "test", the string value
> > "test" could be passed to LabVIEW without any problems.
> >
> > ...
> > }
> >
> > 2. MoveBlock
> >
> > #include "extcode.h"
> > #include "hosttype.h"
> > #include "windows.h"
> >
> > struct teststrct{
> > ...
> > const char* test;
> > ...
> > };
> >
> > struct teststrct testinstance;
> >
> > typedef struct {
> > ...
> > LStrHandle test
> > ...
> > } TD1;
> >
> > CIN MgErr CINRun(TD1 *testcluster, LVBoolean *Error) {
> >
> > char *tempCStr = NULL;
> > int32 len;
> > ...
> >
> > tempCStr = (char *)&testinstance.test; //since strcpy didn't work, I
> > used this way to try to copy the const char* to char*.
> > len = StrLen(tempCStr);
> >
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> > *Error = LVFALSE;
> > goto out;
> > }
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> > MoveBlock(&tempCStr, LStrBuf(*testcluster->test), len); // the string
> > was able to passed to LabVIEE, but it was unreadable.
> > ...
> >
> > out:
> > ...
> >
> > }
> >
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Converting/packing a string of 01010101 to a byte

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