Cfile read write and type

Denies read access to all others. Choose the first, or both, of the following file creation mode options. The default creation mode is CFile::

Cfile read write and type

It is encapsulated in a single file, dib.

cfile read write and type

What makes this interesting is that I was able to create a scrollable bitmap image without expending a whole lot of effort to do so. I do this in a modeless dialog, but you could do the same thing using a generic CWnd class and make the CStatic a child of that control.

C++ - How to get a CString object from a file with CFile::Read() in Unicode? - Stack Overflow

I also wanted to highlight the area selected in the ListBox and show it on the bitmap image. Now the way most people would approach this is to write a control that displayed the bitmap and handled an XOR-style highlight around the area of interest. I was extremely lazy, and simple created a child window which was painted with an alternating-black-and-white pen and hollow brush.

I could make it blink just by showing it and hiding it at the user's selected caret blink rate. I was therefore able to write this in a very short period of time. Rather than penalize those with slow modems, and because I want to put technology pictures on this page, I have put the pictures of the program running on a separate page.

According to FrontPage, this page should take about two minutes to download at If you have T1, DSL, etc. This uses one of my favorite devices, the owner-draw ListBox with a class hierarchy. I usually start with an abstract class at the top-level of the hierarchy, and build down from that.

The DrawItem logic simply calls a virtual Draw method for this superclass and the class then draws itself. Reading a bitmap file and creating a bitmap This is a simplified reader; it only reads uncompressed bitmaps.

I do not have any instances of compressed. The format of compressed files is carefully documented and if you need to, you have the complete source code and, if anyone does add this, if you send it back to me I'll include it in the distribution and give you credit for the enhancements.

I also support only bottom-to-top bitmap organization, although I've added code to make pretensions of supporting the possibility of top-to-bottom organization. Reading the bitmap is moderately straightforward.

It is complicated a bit by the additions of the "Version 4" and "Version 5" bitmaps which have enhanced features. Microsoft has complicated this somewhat more by defining separate upward-compatible versions of the headers, rather than creating, say, a version 4 header whose front part was a regular header and which appended additional fields.

I handle this by assuming it is a standard bitmap header and reading it. Since all bitmaps require the same basic information, I can use the core information from all of them to create the bitmap. I save the file position at which I read the header although it is actually zero, I feel more comfortable asking about itread the header, look at its length, and then read the header again into a V4 or V5 structure if necessary.

I then display all the header information. Following the header information there may be a palette. If the "colors used" value is zero, then the palette is the maximum size required by the color depth, if the image is paletted 1- 4- and 8-bit sizes.

If the "colors used" value is nonzero, there is a palette, independent of the color depth this is to provide forand bit bitmaps an "optimal palette" if they had to be displayed on paletted devices. There are two issues here in "reading a bitmap". One is that I want to read in each horizontal scan line and display it in expanded form in the ListBox.A Bit of History-- dBASE was created by C.

Wayne Ratliff as Vulcan in (named after a certain alien race from a very popular Science Fiction TV show). It was purchased by Ashton-Tate and sold as dBASE II in , and we go forward from there. You can learn more history of the software from the Wikipedia page here: Wikipedia dBASE Page.

This little project came about because of a sequence of questions that came up on the newsgroup. It illustrates a variety of techniques, mostly relating to bitmaps. When you write a newline character (0x0A) to a text-mode CStdioFile object, the byte pair (0x0D, 0x0A) is sent to the file.

When you read, the byte pair (0x0D, 0x0A) is translated to a single 0x0A byte. CFile::Write for float data type. All the examples I have seen for CFile::Write is to write a string of char.

Can this be used to write float data direct to the file? I was thinking when I posted this. I am trying to write float data into a CSV file. Then I want to read the CSV file in MS Excel.

If I write float data into the CSV file, the. USB Background USB History. Universal Serial Bus (USB) is a standard interface for connecting peripheral devices to a host computer.

The USB system was originally devised by a group of companies including Compaq, Digital Equipment, IBM, Intel, Microsoft, and Northern Telecom to replace the existing mixed connector system with a simpler architecture. "The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years.

I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing.

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