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If you are working on a UNIX-like machine, you can use the pipe() function to create new file descriptors. In Listing 6-9, two pairs of pipes are set up: one for sending messages from the parent to the child and one for sending messages in the other direction. Two GIOChannels can then be created from these file descriptors by calling the following function on each. After the pipes are created, the application is forked with fork(). If the fork is successful, the application is set up for both the child and the parent process. Within setup_app(), we begin by closing the pipes that are not needed by the child or parent applications with close(). Each process will only need one read and one write pipe in order to send and receive messages. Next, we use the two remaining pipes in each application and set up a GIOChannel for each. We will use channel_read to receive data from the other process and channel_write to send the new content of the GtkEntry. channel_read = g_io_channel_unix_new (input[0]); channel_write = g_io_channel_unix_new (output[1]); After initializing your IO channels, you need to set up a watch on channel_read. The watch will monitor the channel for the specified events, which is setup with g_io_add_watch(). guint g_io_add_watch (GIOChannel *channel, GIOCondition condition, GIOFunc func, gpointer data); codeproject vb.net barcode generator Generating labels with barcode in C# using Crystal Reports ...
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20 Jan 2018 ... Creating Code 128B barcodes with VB . NET . ... I used the information off Wiki to make a VB Barcode generator . It seems to work well. I don't know how to print the ... to say, my code is sloppy. Feel free to give me any pointers. A native function is said to have a native entry point, which is its address Similarly, a managed function has a managed entry point A function that may be called by both native and managed code has two separate entry points, one that is the actual function, and another that is a small compiler-generated stub known as a thunk, which handles the context switch between native and managed code, and then calls the real function You know that functions in Visual C++ have calling conventions specifying how parameters are handled by a function you looked at some earlier The native calling conventions, such as __cdecl, __stdcall, and __thiscall, specify certain ways of passing parameters Managed functions similarly have a calling convention, __clrcall, that characterizes the particulars about how managed functions are called A function with the __clrcall calling convention only has a managed entry point. IO channel callback functions receive three parameters: the GIOChannel, the condition that occurred, and the data passed from g_io_add_watch() TRUE should always be returned from the callback function unless you want it to be removed The function prototype follows: gboolean (*GIOFunc) (GIOChannel *source, GIOCondition condition, gpointer data); Reading from and writing to a GIOChannel is done in the same manner regardless of whether it is a file or a pipe Therefore, the g_io_channel_read_(*) and g_io_channel_write_*() functions covered in the previous section can still be used Many of the GIOChannel functions provide two ways to check for errors The first is the GError structure that we have used in past chapters Secondly, many functions return a GIOStatus value, which will report one of the following four values: G_IO_STATUS_ERROR: Some type of error has occurred You should still track errors even if you are checking for this value. G_IO_STATUS_NORMAL: The action was successfully completed G_IO_STATUS_EOF: The end of the file has been reached G_IO_STATUS_AGAIN: Resources are temporarily unavailable You should try again later.. create barcode using vb.net VB.NET Barcode Generator Tutorial, Generate & create linear, 2d ...
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