March 14, 2001 Output to USB printer | ||||
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Thanks for your suggestions, but it doesn't work like it should. I cannot open the USB device by fopen( "PRN:"... and I don't find a possibility to redirect for example LPT1: to the USB device. Is there any possibilty just to open a stream to the windows standard printer without having to care where it is located at all?? Heinz-Peter Nuettgens |
March 14, 2001 Re: Output to USB printer | ||||
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Posted in reply to Heinz-Peter Nuettgens | Heinz-Peter Nuettgens wrote:
> Thanks for your suggestions, but it doesn't work like it should.
>
> I cannot open the USB device by fopen( "PRN:"...
> and I don't find a possibility to redirect for example LPT1: to the USB
> device.
>
> Is there any possibilty just to open a stream to the windows standard
> printer
> without having to care where it is located at all??
>
> Heinz-Peter Nuettgens
Print to LPT1 as you used to do and redirect the lpt1 port to the windows
printer you want to use.
See windows help "net use" command.
When you don't want to do it this way you probably need to open a device directly using the DeviceIOControl and the CreateFile API functions.
DeviceIoControl
The DeviceIoControl function sends a control code directly to a specified
device driver, causing the corresponding device to perform the
corresponding operation.
BOOL DeviceIoControl(
HANDLE hDevice, // handle to device
DWORD dwIoControlCode, // operation control code
LPVOID lpInBuffer, // input data buffer
DWORD nInBufferSize, // size of input data buffer
LPVOID lpOutBuffer, // output data buffer
DWORD nOutBufferSize, // size of output data buffer
LPDWORD lpBytesReturned, // byte count
LPOVERLAPPED lpOverlapped // overlapped information
);
CreateFile
The CreateFile function creates or opens the following objects and returns
a handle that can be used to access the object:
Consoles
Communications resources
Directories (open only)
Disk devices (Windows NT/2000 only)
Files
Mailslots
Pipes
HANDLE CreateFile(
LPCTSTR lpFileName, // file name
DWORD dwDesiredAccess, // access mode
DWORD dwShareMode, // share mode
LPSECURITY_ATTRIBUTES lpSecurityAttributes, // SD
DWORD dwCreationDisposition, // how to create
DWORD dwFlagsAndAttributes, // file attributes
HANDLE hTemplateFile // handle to template file
);
Success,
Arjan
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