Invalid file name message.

This is the error message you normally get when you use the the wrong file convention, As in the example below I used "\" instead of "\\" in the file path, as AX only excepts "\\":

static void ReadingFile(Args _args)
{
    TextIo      inputFile;
    //This syntax is for reading file in a local machine, we always use "\\" instead of "\"
    // AX does not read "\"
    inputFile = new TextIo("C:\test.txt", 'R');
    if (inputFile)
    {
        info("File found");
    }
}

Solution:

static void ReadingFile(Args _args)
{
    TextIo      inputFile;
    //This syntax is for reading file in a local machine, we always use "\\" instead of "\"
    // AX does not read "\"
    inputFile = new TextIo("C:\\test.txt", 'R');
    if (inputFile)
    {
        info("File found");
    }
}

This is the correct way. Same goes for network path, you need to use "\\\\" instead of "\\", as shown below:

static void ReadingNetworkFile(Args _args)
{
    TextIo      inputFile;
    //This syntax is for reading file in a local machine, we always use "\\" instead of "\"
    // AX does not read "\"
    inputFile = new TextIo("\\\\AXServer\\test.txt", 'R');
    if (inputFile)
    {
        info("File found");
    }
}

Stack trace: Invalid attempt to call WinAPI::findFirstFile running in CIL on the client.

Stack trace: Invalid attempt to call WinAPI::findFirstFile running in CIL on the client

This error you will normally encounter when running a batch job. The issue is that batch processing doesn't suppport WINAPI::findFirstFile method. Actually I was trying to find a file in the folder and moving to some other folder, you can use this alternative:

public void run()
{
System.IO.DirectoryInfo di;
System.Type arrayType;
System.Array array;
System.IO.FileInfo fi;
FilePath filePath, moveFilePath, shortFile;
int i;
int l;

;

super();

    baseFolder = tEC_InterfaceSetup.TEC_DefaultFolder +"\\";
    di = new System.IO.DirectoryInfo(baseFolder);
    arrayType = System.Type::GetType("System.IO.FileInfo");
    array = System.Array::CreateInstance(arrayType, 1);
    array = di.GetFiles("*" + #txt);
    l = array.get_Length();


    if (l > 0)
    {
        //Find the files in the base folder and iterate.
        for (i = 0; i < l; i++)
        {
            fi = array.GetValue(i);
            mainFolder = fi.get_FullName();
            foundBaseFileName = fi.get_Name();  
         //**********Your logic************
        }
        
        InterfaceTransfer::moveFile(foundBaseFileName , moveFilePath);
    }
}



server static void moveFile(str fileName, str newFileName)
{
    #File
    Set                 permissionSet;
    permissionSet =  new Set(Types::Class);
    permissionSet.add(new FileIOPermission(fileName,#io_write));
    permissionSet.add(new InteropPermission(InteropKind::ClrInterop));
    CodeAccessPermission::assertMultiple(permissionSet);
    System.IO.File::Move(fileName, newFileName);
    CodeAccessPermission::revertAssert();
}


Hope this helps.