Check ReadFile is Processing in COM Port using VC++

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Hi All,
Now i am doing Medical Device Project.The Purpose of this Project is Convert a medical Device data into PDF(s) or Image File(s). i am new for C++. So Please help.I think, This is a flow of COM Port Program.ReadFile >> Write File >> CreateFile.So I want to Check information(s) are reading from medical Device or Not.
in my Code:

C++

extern "C" __declspec(dllexport) int <methodname>(char *str,char *sFilename)
{
//creatFile Method
//writefile Method
int z =0;
for(;;)
{
ReadFile(hCom,buffer,1,&d,NULL);
if (d == 1)
{
if (z == 0 && buffer[0]!= 27)
continue;
// Get File Size;
else 
{
break;
}
//Delete FileSize
buffer [0] =0;
//CloseHandle(hCom);
Return finished;
}
}
}

Here finished is return value of Method. I want to return value is 0 when file doesn't create.So how to achieve this? Please very Urgent.
Thanks
Lakshmi Narayanan.S

Posted 6-Sep-12 1:08am

naraayanan

Updated 9-Sep-12 18:07pm

JF2015

v4

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Comments

__John_ 6-Sep-12 8:10am

I think you need to re-phrase your question. It is not clear what you are asking.

[no name] 7-Sep-12 10:58am

Even after your update, this still does not make any sense. As it stands the answer to "How to identify Port does not read a file" is that the port does not return any data. But it's very difficult to figure out what it is that you are really asking.

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«_Superman_» · Answer 1 · 2012-09-09T19:51:00

Solution 1

Every API has a return value that you can check to see if the operation succeeded or resulted in an error.
This way you can determine what to return from your function based on the return value of the API.

For example, the ReadFile case would be some this like this -

if (FALSE == ReadFile(hCom,buffer,1,&d,NULL))
    return 0;

Posted 9-Sep-12 19:51pm

«_Superman_»

Comments

naraayanan 11-Sep-12 1:19am

Hi Superman,
Thanks.But it doesn't work.