請教各位大大: 我使用createfile這個API建立RS232，當COMPORT編號小於10時可用，但大於10時如COM13就讀不到了，為什麼呢?有解嗎?謝謝。 hComm = CreateFile("COM13", //com port number GENERIC_READ | GENERIC_WRITE 0, NULL, OPEN_EXISTING, 0, 0);

我在網路上search到以下片段文章，有人看地懂嗎? I am using 16-port serial card and was not able to access serial ports com10 - com18. I have seen a couple of people complaining about the same problem. The cause of the problem is that CreateFile accepts strings "com1" - "com9" as names of devices and reject to do so for two and more digit numbers. In order to open "com10" and above we actually have to feed "\\\\.\\com10" string to CreateFile. The simple fix to winsup/path.cc given below would solve the problem. Can someone integrate this? Stas. bash-2.02$ diff -u path.cc.00 path.cc --- path.cc.00 Wed Oct 27 20:55:55 1999 path.cc Thu Dec 16 14:49:36 1999 @@ -400,7 400,7 @@ "\\dev\\ttym", "\\dev\\tty%d", "\\dev\\ptym", - "com%d", "\\\\.\\com%d", "\\dev\\pipe", "\\dev\\piper", "\\dev\\pipew", bash-2.02$

是否有其他的API可以達成Open Comport???

一部電腦要裝2個以上的rs232好像不容易,我想一定有裝卡片,直接問該公司或許會比較快,應該也會有現成的東東吧!

hComm = CreateFile("\\\\.\\com10", //com port number GENERIC_READ | GENERIC_WRITE 0, NULL, OPEN_EXISTING, 0, 0); 這樣子就可以了

列舉COM port 清單

void __fastcall TForm1::Button1Click(TObject *Sender)
{
   TStrings *Coms = new TStringList();        HANDLE hCom;     
    char chPort[5];  
    memset( chPort, '\0', sizeof( chPort ) );        for (int i=1; i<20; i   )          {    
        sprintf( chPort , "\\\\.\\COM%d" , i );  
       
        hCom = CreateFile( chPort , GENERIC_READ | GENERIC_WRITE , 0 , NULL ,
                                OPEN_EXISTING , FILE_ATTRIBUTE_NORMAL , 0 );            if ( hCom != INVALID_HANDLE_VALUE ){Coms->Add( AnsiString(chPort) );
       }         CloseHandle( hCom );
    }        delete Coms;
}    

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發表人 - axsoft 於 2003/09/16 15:46:30