FiveTech Software tech support forums

... 3. DBCOMMIT() writes all local modifications in table and index files then it sends to system or file server request to flush (write) its disk buffers to physical device (HARD COMMIT). It's out of application control what OS (or FS) do with such request. The locking and buffer flushing in Clipper ...

... if exist) Just for information to all: COMMIT executes the WinAPI function FlushFileBuffers( handle ) thereby ensuring that all the data in the buffers are physically written to the disk. This is executed for dbf, fpt/dbt and all cdx/ntx/idx file handles. This API function also updates the files' ...

... buffer. In fact, each alias in the same application and each application on the same PC. Unless the contents of the buffer are written to the disk buffers of the OS, other client PC buffers can not be refreshed. So we are clear that simple Unlock is flushing data and index buffers to the disk buffers ...

... values are updated and displays with time. Please also note that the OrdKeyNo() also is displayed. Changes in this value indicate that all index buffers are also flushed and visible to the other users on the network. 1) Build and run the "writer.prg" on one of the client PC or Server. ...

... drive cache. Yes. But the documentation says it "hardwrites", same way like "commit". In any case, (x)Harbour can flush its buffers to the OS buffers and but I doubt if (x)Harbour has an control over when the OS physically writes to the disk. But we can normally trust the ...

" COMMIT Perform a solid-disk write for all active work areas Syntax: COMMIT Description: COMMIT is a database command that flushes Harbour buffers and performs a solid-disk write for all work areas with open database and index files. The solid-disk write capability is available under DOS ...

Otto wrote:I mean, assuming the system doesn't crash. Do you really have to make a commit for another user to see a change?

No, as far as I know. It is the network system responsibility to handle those situations with the system buffers.

Goto Recno() works the same .. physically moves the record pointer back to itself thereby flushing and writing the buffers

Rick Lipkin

... editing a record in a .dbf .. a simple Goto Recno() is just as good as dbCommit() .. because you are moving the record pointer which flushes the buffers ... Rick Lipkin Sorry. I do not agree. https://vivaclipper.wordpress.com/2014/01/17/dbcommit/ https://vivaclipper.wordpress.com/2014/03/15/hb_frecno/ ...

To All

I still contend that when when you finish adding or editing a record in a .dbf .. a simple Goto Recno() is just as good as dbCommit() .. because you are moving the record pointer which flushes the buffers ...

Rick Lipkin

... dbCommit() make two things: 1. write application memory buffers to file. 2. send to OS request to flush disk buffers releated to open file. The 1-st action is executed also by any other rdd operation which ...

... - It is noticed that libharu.lib along with the present png.lig of (x)Harbour is unable to read some png files/buffers. Temporarily, fwpdf.prg is modified. Now png images are first read by FWH using itw own functions, bypassing the libharu native functions and ...

It is noticed that libharu.lib along with the present png.lig of (x)Harbour is unable to read some png files/buffers. Temporarily, we modified the fwpdf.prg. Now png images are first read by FWH own functions, bypassing the libharu native functions and then create pdf images ...

... imaging functionality that is not possible with the in-built functions of libharu. Libharu has inbuilt functions for png and jpg files/image buffers. In addition, it has one function to read images from memory formtted in its proprietory format. HPDF_LoadPngImageFromFileHPDF_LoadJpegImageFromFileHPDF_LoadPngImageFromMemHPDF_LoadJpegImageFromMemHPDF_LoadRawImageFromMem  ...

... is created. It is called with the nID to position the record, the data is changed, and saved. Of course, since tData holds the field values in buffers they all would want to be written back, and if a field is locked, that woulde be a problem. The value of tData is that is a class that INHERITS ...