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Re: [Dev-C++] get serial port info
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From: Per W. <pw...@ia...> - 2007-12-19 23:02:28
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On an old test machine I have, the original code produces:
COM1
COM1
COM1
COM1
COM1
COM1
After adding strdup(), I get:
COM5
COM6
COM7
COM7
COM4
COM1
Are you sure that your change was correct, and that you remembered to
recompile?
One interesting thing here is that COM7 is printed twice, while my much
used COM3 is not enumerated.
The two COM7 seems to be a stupid M$ bug with an USB serial adapter :(
/pwm
On Wed, 19 Dec 2007, Jessica Chen wrote:
> Hi, Per,
>
> for your second method, i modified like this. i doesn't solve the
> problem. the result is the same as before.
> for the first method, i tried to change strSerialList[i] =
> (char*)(szPortName); to strSerialList[i] = strdup((char*)(szPortName));, but
> it seems doesn't work too. :-(
>
> Regards,
> Jessica
>
> do
> {
> Status = RegEnumValue(hKey, dwIndex++, Name, &dwName, NULL, &Type,
> szPortName, &dwSizeofPortName);
> if((Status == ERROR_SUCCESS) || (Status == ERROR_MORE_DATA))
> {
> strSerialList[i] = (char*)(szPortName);
> printf("%s\n",strSerialList[i]);
> i++;
> }
> } while((Status == ERROR_SUCCESS) || (Status == ERROR_MORE_DATA));
> RegCloseKey(hKey);
>
> On Dec 19, 2007 2:44 PM, Per Westermark <pw...@ia...> wrote:
>
> > The test code is buggy. It uses the same buffer to retrieve the device
> > names, which means that the name will be overwritten.
> >
> > A quicky (with a memory leak that doesn't matter here) is to do
> > strSerialList[i] = strdup((char*)szPortName);
> >
> > Another alternative is to print the devices one-by-one directly when they
> > are found.
> >
> > /pwm
> >
> > On Wed, 19 Dec 2007, Jessica Chen wrote:
> >
> > > Name Type Data
> > > (Default) REG_SZ (value not set)
> > > \Device\Serial0 REG_SZ COM1
> > > \Device\U2SPORT1 REG_SZ COM7
> > >
> > > if i used on my computer, i can see:
> > > COM1
> > > COM1
> > >
i> > > when i used my .exe on my colleagues computer.
> > > he has 2 serial port and 1 usb->serial.
> > > but we can only see "COM4" for 3 times.
> > >
> > > so at least, the code can recognize how many COM on computer, whatever
> > real
> > > com port or usb-com.
> > > but cannot read right com port number.
> > >
> > >
> > > On Dec 19, 2007 1:57 PM, Rafael Menezes <so...@gm...> wrote:
> > >
> > > > Hi Jessica.
> > > >
> > > > Can you, for start, list what is on "HARDWARE\\DEVICEMAP\\SERIALCOMM"
> > in
> > > > your computer?
> > > >
> > > > Regards
> > > > Rafael
> > > >
> > > >
> > > > On 19/12/2007, Jessica Chen <jes...@gm...> wrote:
> > > > >
> > > > > Hi, thanks for ur email, Rafael.
> > > > >
> > > > > I researched myself.
> > > > > I wrote a code. I will list it as follows.
> > > > > The problem seems it can recognize the real serial com port (Com 1
> > in my
> > > > > computer, registry).
> > > > > But on my computer, I have a USB->serial com port (Com 7 in my
> > > > > computer, registry).
> > > > > The code cannot recognize the USB->serial com port.
> > > > > Is there any experienced persons can give any idea about that?
> > > > >
> > > > > #include <windows.h>
> > > > > #include <stdio.h>
> > > > > #include <tchar.h>
> > > > >
> > > > > int main(void)
> > > > > {
> > > > > char *strSerialList[256];
> > > > > HKEY hKey;
> > > > >
> > > > > if( RegOpenKeyEx(HKEY_LOCAL_MACHINE,
> > > > > TEXT("HARDWARE\\DEVICEMAP\\SERIALCOMM"),
> > > > > 0,
> > > > > KEY_READ,
> > > > > &hKey) != ERROR_SUCCESS)
> > > > > {
> > > > > return -1;
> > > > > }
> > > > >
> > > > > int i=0;
> > > > > CHAR Name[25];
> > > > > UCHAR szPortName[25];
> > > > > LONG Status;
> > > > > DWORD dwIndex = 0;
> > > > > DWORD dwName;
> > > > > DWORD dwSizeofPortName;
> > > > > DWORD Type;
> > > > > dwName = sizeof(Name);
> > > > > dwSizeofPortName = sizeof(szPortName);
> > > > >
> > > > > do
> > > > > {
> > > > > Status = RegEnumValue(hKey, dwIndex++, Name, &dwName, NULL,
> > > > > &Type,
> > > > > szPortName, &dwSizeofPortName);
> > > > > if((Status == ERROR_SUCCESS) || (Status == ERROR_MORE_DATA))
> > > > > {
> > > > > strSerialList[i] = (char*)(szPortName);
> > > > > i++;
> > > > > }
> > > > > } while((Status == ERROR_SUCCESS) || (Status ==
> > ERROR_MORE_DATA));
> > > > > RegCloseKey(hKey);
> > > > >
> > > > > for(int j=0;j<i;j++)
> > > > > {
> > > > > printf("%s\n",strSerialList[j]);
> > > > > }
> > > > >
> > > > > return 0;
> > > > > }
> > > > >
> > > > >
> > > > > On Dec 19, 2007 12:34 PM, Rafael Menezes <so...@gm...> wrote:
> > > > >
> > > > > > You can send mails. Can you search on google?
> > > > > >
> > > > > > http://www.google.com.br/search?hl=pt-BR&q=c%2B%2B+com+port&meta =
> > > > > >
> > > > > >
> > http://www.google.com.br/search?num=30&hl=pt-BR&q=c%2B%2B+serial+port&meta
> > > > > > =
> > > > > >
> > > > > >
> > > > > > On 19/12/2007, Jessica Chen <jes...@gm... > wrote:
> > > > > >
> > > > > > > is there anyone have the experience for writing code of getting
> > the
> > > > > > > serial port info from windows?
> > > > > > > can u give me an sample code?
> > > > > > >
> > > > > > >
> > > > > > >
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> > > > > >
> > > > > >
> > > > > > --
> > > > > > Regards
> > > > > > Rafael Menezes
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > > --
> > > > Regards
> > > > Rafael Menezes
> > >
> >
> >
>
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