C / C++ / MFC

struct FileData<br />
{<br />
char* String;<br />
short MajorVersion;<br />
short MinorVersion;<br />
};<br />
<br />
// to write the file<br />
FileData data;<br />
// assuming data has already been filled in<br />
FILE pFile = fopen(..., "wb");<br />
long size = strlen(data.String);<br />
fwrite(&size, sizeof(size), 1, pFile);<br />
fwrite(data.String, size, 1, pFile);<br />
fwrite(&data.MajorVersion, sizeof(short), 1, pFile);<br />
fwrite(&data.MinorVersion, sizeof(short), 1, pFile);<br />
<br />
// to read the file<br />
FileData data1;<br />
FILE pReadFile = fopen(..., "rb");<br />
long readSize = 0;<br />
fread(&readSize, sizeof(readSize), 1, pReadFile);<br />
assert(readSize > 0);<br />
// create and initialize the new string<br />
data1.String = new char[readSize + 1];<br />
memset(data1.String, 0, readSize + 1);<br />
fread(&data1.String, readSize, 1, pReadFile);<br />
fread(&data1.MajorVersion, sizeof(short), 1, pReadFile);<br />
fread(&data1.MinorVersion, sizeof(short), 1, pReadFile);<br />

Jumpin` Jeff wrote:

Can you explain what #pragma pack will do for me?

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

static ObjectRootPtr ms_instances[MAX_INSTANCES];

//! Static variable definition
RTI::RTIambassador* ObjectRoot::ms_rtiAmb = NULL;
RTI::ObjectClassHandle ObjectRoot::ms_classId = 0;
const char* ObjectRoot::ms_classIdStr = NULL;

ObjectRootPtr ObjectRoot::ms_instances[MAX_INSTANCES] = // MAX_INSTANCES = 21
{ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL };

Jay03 wrote:

PS: WHAT DOES THE SECOND LINE MEAN .... ARE YOU MAKING THE POINTER ObjectRootPtr point to class member ms_instances of size 21. I thought it was something like ObjectRootPtr = new ms_instances;

Jay03 wrote:

For the first part..... what do STATIC POINTERS DO?

Jay03 wrote:

In the last part. ObjectRootPtr is pointer to an ObjectRoot object.

Jay03 wrote:

Now this ObjectRootPtr was pointing to ms_instances[21] of size 21.

// NOTE: this is just a draft example to show the idea
class CMainFrame : public CMDIFrameWnd
{
// ...
   CToolBar    m_wndToolBar;
   CToolBar    m_wndToolBar2;
// ...
};

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
// ... create and other blah-blahs ...

   m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY);
   EnableDocking(CBRS_ALIGN_ANY);

   DockControlBar(&m_wndToolBar);

   RecalcLayout();
   
   CRect rect;
   m_wndToolBar.GetWindowRect(rect);
   rect.OffsetRect(rect.right, 0);

   m_wndToolBar2.EnableDocking(CBRS_ALIGN_ANY);
   DockControlBar(&m_wndToolBar2, AFX_IDW_DOCKBAR_TOP, rect);

   return 0;
}