C / C++ / MFC

13-Oct-05 7:13

I hope someone can help me with this one.

I created a DLL to be used by one of my programs. Here is the code I use to load the DLL:

	HINSTANCE hDLL;<br />
        int iReturnVal;<br />
	MYDLL dll;<br />
<br />
	hDLL = LoadLibrary("MYDLL.DLL");<br />
<br />
	if (hDLL != NULL)<br />
	{<br />
           // Do stuff<br />
	}<br />
	else<br />
	{<br />
		iReturnVal = MessageBox("Missing DLL: MYDLL.DLL","ERROR",MB_OK);<br />
	}<br />

When I run my program in the development workstation (where Visual Studio is loaded), it executes without a problem.

I moved the executable and the dll to a different testing PC (along with msvcr70.dll and mfc70.dll, needed becuase that PC didn't have them).

I put the executable and the three dll's (the MS ones and my own) in the same directory. I can start my application but when I try to use the section that executes the code above, I get the "Missing DLL: MYDLL.DLL" message. Confused | :confused:

Any ideas?

Am I missing something?

C^hris L^osinger13-Oct-05 7:19

C^hris L^osinger

13-Oct-05 7:19

if the DLL isn't in one of the folders in your PATH (environment variable), the OS can't load it.

try putting the DLL in your main Windows (WINNT, Windows, whatver) folder.

Cleek | Image Toolkits | Thumbnail maker

pgarciajumela13-Oct-05 7:22

13-Oct-05 7:22

Thanks Chris,

But the DLL is not in one of the folders of my path in the development PC. How can it work there just by putting it in the same directory as the executable but not work in the other PC?

Confused | :confused:

pgarciajumela13-Oct-05 7:31

13-Oct-05 7:31

Tried that....

No luck

C^hris L^osinger13-Oct-05 7:40

C^hris L^osinger

13-Oct-05 7:40

then there's a good chance your DLL depends on some other DLL that it can't load - causing your own DLL to fail to load.

try DependencyWalker[^] to see which DLLs your DLL is looking for.

Cleek | Image Toolkits | Thumbnail maker

pgarciajumela13-Oct-05 8:45

13-Oct-05 8:45

Thanks,

I found the missing DLL

GDI- How to draw concentric circles in the client area of window

Blake V. Miller13-Oct-05 18:07

Blake V. Miller

13-Oct-05 18:07

Windows documentation CLAIMS that the folder from which the parent process was loaded will also be searched. With the DLL in the same folder as the EXE it should have worked. What is more likely is that some OTHER DLL that MyDLL depends upon is missing.

tamila_tamila13-Oct-05 7:00

tamila_tamila

13-Oct-05 7:00

hi,

i am working in win32 application using MFC.

actually i have to draw moving concentric circles i.e dynamically 10 circles , one above another should open like a flower and close it, and this should continue until i stop it. whichever position i stop it , in that stage it should show.

e.g,

when i click my mouse on client area of window. concentric circles should be generated in a moving fashion , not at the same time all circles should be displayed. up on reaching 10th circle automatically it should decrease in the same moving fashion. this process should be continued until i reclick my mouse on the client area.

thanku for ur patience in reading,

could u provide me any suggestions

thanks

Re: GDI- How to draw concentric circles in the client area of window

S. Senthil Kumar13-Oct-05 21:59

S. Senthil Kumar

13-Oct-05 21:59

You can use CDC::Ellipse[^] to draw circles.

As for drawing concentric circles, you need to use a timer[^] to progressively draw smaller/larger circles. On each tick of the timer, check if you are expanding or collapsing, then use the appropriate radius for the circle and draw it.

You also need to check if the mouse has been clicked between two ticks of the timer and if so, prevent further drawing.

Regards
Senthil
_____________________________
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Runtime Error, dbgheap.c Line:612

Jader8913-Oct-05 6:21

Jader89

13-Oct-05 6:21

I've tried looking up this error elsewhere with no luck. Here is what im doing to cause the error. First creating a pointer to a byte(or char, whatever) of data:

char* data = (char*)malloc(sizeof(char));
memset( data, 0, sizeof(char) );

Then read in a char from a open file:

file.Read( data, sizeof(char) );

Then check for either '\t' or '\n'... All variables have been declared as follows

bool out;
CString str;
CFile file; // this has been opened properly, and ready for reading.
UINT32 tmp;
byteSwap bs; // All this does is change a UINT32 to a float, and vice versa.

do
{
out = false;
str.Empty();
do
{
file.Read( data, sizeof(char) );
if( *data == '\t' )
{
tmp = (UINT32)atoi( str.GetBuffer() );
bs.i = tmp;
msg.icd.gimary.points[i][0] = bs.f;
str.Empty();
} else if ( *data == '\n' ){
tmp = (UINT32)atoi( str.GetBuffer() );
bs.i = tmp;
msg.icd.gimary.points[i][1] = bs.f;
out = true;
} else {
char ch = data[0];
str.AppendChar(ch); // Error here
}
}
while( !out );
i++;
}
while( i < msg.icd.gimary.numPoints );

After a large portion of the file has been read, i get an error in dbgheap.c @ line:612, which is a _CrtCheckMemory() failure... Any ideas on how this is caused? If you need more info, just post. I'll reply within 5 mins or so. Thanks in advance!

David Crow13-Oct-05 7:06

David Crow

13-Oct-05 7:06

Jader89 wrote:
char* data = (char*)malloc(sizeof(char));
memset( data, 0, sizeof(char) );

Then read in a char from a open file:

file.Read( data, sizeof(char) );

This is pointless. Why are you bothering the memory manager for something so trivial?

char data;
file.Read(&data, sizeof(char));

Jader89 wrote:
tmp = (UINT32)atoi( str.GetBuffer() );

Unless you have plans on modifying str, the call to GetBuffer() is not necessary.

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Jader8913-Oct-05 8:13

Jader89

13-Oct-05 8:13

yes your right, ive been changing it around alot trying to solve this error, and wasnt paying attention to that aspect. Its changed now, but this doesnt help the fact that this error is caused by the AppendChar() which calls a ReAllocate method, and after the 1024, (default) time through, it calls the _crtCheckMemory() and fails, I've even tried doing it after 16 times through by changing a crt flag, still fails... My problem is that i dont see why this check is failure, and why my heap is losing integrety.

David Crow13-Oct-05 10:20

David Crow

13-Oct-05 10:20

Jader89 wrote:
...this error is caused by the AppendChar()...

What class is this a method of? Are you using VC++ v6 or .Net?

"One must learn from the bite of the fire to leave it alone." - Native American Proverb