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Hi
I am opening the com port for a printer device and it opens it even if the printer is not connected. More over it sends the data also to com port even printer is not there.
Can any body help me how can i detect the device is connected or throw an error if device is not connected or can detect something on the data is not receiving to the device?
Thanks
Shailesh
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ports will connect regardless of the device connected or not, try to send some data and then wait for the signal from the printer, if no signal then raise error
if you just want to control the printer why not use the printer api
C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg
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i am trying to perform some functions on a floppy. i created a handle for that floppy and tried to read the bootsector using ReadFile and WriteFile.
i would like to
Perform a directory listing of the current directory on the floppy
Change directories on the floppy
Create directories on the floppy
Delete directories on the floppy
please show examples if possible or give link to any helpfull website on accessing a floppy disk
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Assuming you have a drive letter for the floppy, the following functions will work.
FindFirstFile / FindNextFile
SetCurrentDirectory
CreateDirectory
DeleteFile, or SHFileOperation
Stability. What an interesting concept. -- Chris Maunder
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I have run into some problems while trying to write a scripting language in VC++ 7. I want it to all be in an edit box. For example, if the user types this in the edit box:
String MyString = "Hello";
if (MyString == "Hello")
sendkeys(Hello);
else
MoveMouse(160,480);
end;
Quite a pointless program, but I am having a hard time handling it with C++. How do I handle the boolean logic, and how would I get both of the parameters of the MouseMove function. I would like the program to execute from the top to the bottom. Anyone have any idea how to do this? I just need the basic idea of how to do it. Any help would be appreciated
-Dev578
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writing an interpreter is a huge task. if you don't know where to begin, you're much better off using an interpreter that's already written.
there are free interpreters for many languages out there, including things like VBScript, Tcl, Lua, Python, Ruby, etc.. try Google.
Cleek | Losinger Designs | ClickPic | ThumbNailer
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Chris is right. It's really a huge task. But if you insist, books like this kind would be very helpful to you : Writing compilers and interpreters[^]. After all, innovation drives the world to get better and better. 
Maxwell Chen
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Might anyone know why the following line works in WinXP but not in Win2000
<br />
pMyDocTemplate->OpenDocumentFile( NULL ); <br />
In windows2000 apparently it's telling me there isn't a dialog template.
An interesting note is that, if I create a new document through the toolbar, close the document, then call this method again, it will work. Puzzled by this.
Thanks!
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You're using the same binary on both Windows XP and Windows 2000, and the same version of the MFC DLL?
Is the Windows 2000 system running Service Pack 4? The DLL Help Database[^] indicates that Windows 2000 SP4 shipped a new version, 6.0.9586.0, of mfc42.dll. If you're compiling with MFC 6.0, supplied with Visual Studio 6.0, this might (potentially) be causing the problem. An even newer version, 6.0.9782.0, ships in Visual Studio 6 Service Pack 6.
Exactly what problem occurs? Do you get an ASSERT failure, or an error message? Is the behaviour consistent across Debug and Release builds?
If you get an ASSERT, what source file and line is listed? If you get an error, what is the exact error message?
[edit] Are you using a CSingleDocTemplate, a CMultiDocTemplate, or your own class derived either from one of those or directly from CDocTemplate? [/edit]
Stability. What an interesting concept. -- Chris Maunder
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Hi, I have some functions written in C# I want to use in Win32 API program (C++ used).
How can I do it. If someone can give me a sample code or direct to the some tutorial.
Thanks
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The 'easy' way - use the regasm tool to export the C# class to COM. Use COM to load the C# code and call it.
The harder way - decompile your C# code with ildasm, add the appropriate declarations to the IL to get the CLR to generate flat exports (as in a traditional C DLL) and recompile with ilasm.
The really hard way - investigate the CLR hosting interfaces.
Stability. What an interesting concept. -- Chris Maunder
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Does anyone know whether it's possible to recognize right clicks with the CButtonST class developed by Davide Calabro? I know that you can declare a function
afx_msg void OnButton(UNIT nID)
in order to handle left-clicking a button, but can a similar process be applied for a right click? If anyone knows how to do this, please let me know.
~David
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Is there a way that you can attach a command-line parameter on the end of an url? I want to send someone a hyperlink that will open up an .exe - that part works fine, but I also want them to be able to send 2 parameters, (the name of two text files). Is there any way to do that?
If it's broken, I probably did it
bdiamond
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just append the variables to the end of the URL. THey will be ignored if not needed.
so if the URL is "http://this.com/that.exe" just change it to "http://this.com/that.exe?VAR1=foo.txt&VAR2=bar.txt"
Glano perictu com sahni delorin!
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thanks, but are VAR1 and VAR2 going to be automatically recognized?
If it's broken, I probably did it
bdiamond
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my aim is to create a key board driver, i got a program from the net and it is working but i have to focus the the keyboard events to a desired window (say ms word). what changes should i make in the following codes.
#include "mian.h"
#define MAX_COUNT 50 // Max number of keystrokes to remember
#pragma data_seg(".shared") // ".shared" is defined in exports.def to allow
// all instances of the dll to share these variables
HWND m_hHwndKey = 0;
HHOOK m_hHookKey = 0;
HWND m_hHwndMouse = 0;
HHOOK m_hHookMouse = 0;
CHAR m_szMain[MAX_COUNT] = ""; // A buffer to store decoded keyboard codes
int m_nLastPos = 0; // Last position used in the buffer
HCURSOR m_hCursorLast = 0; // These two values are used to copy the mouse
HCURSOR m_hCursorLastRet = 0; // cursor
#pragma data_seg()
// Set the values for the window and hook for the Keyboard hook
void WINAPI SetValuesKey(HWND hWnd, HHOOK hk) {
Sleep(0);
m_hHwndKey = hWnd;
m_hHookKey = hk;
}
// Set the values for the window and hook for the mouse hook
void WINAPI SetValuesMouse(HWND hWnd, HHOOK hk) {
Sleep(0);
m_hHwndMouse = hWnd;
m_hHookMouse = hk;
}
// This is the mouse hook itself
LRESULT CALLBACK MouseProc( int nCode, WPARAM wParam, LPARAM lParam ) {
Sleep(0);
if (nCode < 0) {
return CallNextHookEx(m_hHookMouse, nCode, wParam, lParam);
}
Sleep(0);
if (nCode == HC_ACTION) {
HCURSOR hCursor = GetCursor();
// Copy the mouse cursor
if (hCursor != m_hCursorLastRet) {
if (m_hCursorLast) {
DestroyCursor(m_hCursorLast);
}
ICONINFO ii;
GetIconInfo(hCursor, &ii);
m_hCursorLast = CreateIconIndirect(&ii);
DeleteObject(ii.hbmMask);
DeleteObject(ii.hbmColor);
Sleep(0);
m_hCursorLastRet = hCursor;
Sleep(0);
}
// If the message is a WM_NC*, convert it to a WM_*
if ((wParam >= 0xA0) & (wParam <= 0xA9)) {
wParam = wParam + 352;
}
// Let the listening window know about the message
Sleep(0);
PostMessage(m_hHwndMouse, wParam, 0, MAKEWPARAM(
( (MOUSEHOOKSTRUCT*) lParam )->pt.x,
( (MOUSEHOOKSTRUCT*) lParam )->pt.y));
}
return 0;
}
// Function to get the last mouse cursor that was copied. The return cursor
// is a copy of the copy, so the callee must delete it.
HCURSOR WINAPI GetLastCursor() {
Sleep(0);
HCURSOR hCursor = m_hCursorLast;
m_hCursorLast = 0;
return (hCursor);
}
// Returns the current state of the keyboard bufffer
void WINAPI GetKeyInfo(CHAR * szIn, int * nLastPos) {
Sleep(0);
memcpy(szIn, &m_szMain, MAX_COUNT);
(* nLastPos) = m_nLastPos;
}
// Keyboard hook
LRESULT CALLBACK KeyProc( int nCode, WPARAM wParam, LPARAM lParam ) {
if (nCode < 0) {
Sleep(0);
return CallNextHookEx(m_hHookKey, nCode, wParam, lParam);
}
Sleep(0);
if (nCode == HC_ACTION) {
if (lParam & 0x80000000) {
Sleep(0);
PostMessage(m_hHwndKey, WM_KEYUP, wParam, lParam);
} else {
BYTE lpKeyState[256];
GetKeyboardState((unsigned char *)&lpKeyState);
// Convert the message to a normal keystroke, and store it
// in the buffer
WORD lpChar;
int nRet = ToAscii(
wParam,
(lParam & 0xFF0000) >> 16,
(unsigned char *)&lpKeyState,
&lpChar,
0);
if (nRet == 1) {
m_szMain[m_nLastPos] = (char) lpChar;
m_nLastPos ++;
if (m_nLastPos >= MAX_COUNT) {
m_nLastPos = 0;
}
}
Sleep(0);
PostMessage(m_hHwndKey, WM_KEYDOWN, wParam, lParam);
}
}
return 0;
}
BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID) {
Sleep(0);
if (fdwReason == DLL_PROCESS_ATTACH) {
DisableThreadLibraryCalls(hinstDLL);
}
Sleep(0);
return TRUE;
}
// This is to prevent the CRT from loading, thus making this a smaller
// and faster dll.
extern "C" BOOL __stdcall _DllMainCRTStartup( HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) {
Sleep(0);
return DllMain( hinstDLL, fdwReason, lpvReserved );
}
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A while back I read something telling me that there was a way to call a base class function from the child class; does anyone know how to do this? Thanks!!
If it's broken, I probably did it
bdiamond
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Baseclass::function
Anyone who thinks he has a better idea of what's good for people than people do is a swine.
- P.J. O'Rourke
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duh, thanks! 
If it's broken, I probably did it
bdiamond
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or simply function() if the child class do not have a function with the same name where the base class declare this function to be virtual...
TOXCCT >>> GEII power
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What's the best way to write HTML code to a file? Is it simply to write the raw tags or are there some libraries around that simply this? Thanks in advance.
- Aaron
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Just write tags like if you were writing some kind of text. save it as you would do with a text file. is the same, but put the .htm extension.
Written by: Rafael Fernández López.
void life ( bool me, bool her )
{
if ( her )
{
me = true ;
}
else
{
me = false ;
}
}
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<font style="color:blue;">void </font>life (<font style="color:blue;">bool </font>me, <font style="color:blue;">bool </font>her) {
<font style="color:blue;">if </font>(her) {
me = <font style="color:blue;">true</font>;
}
<font style="color:blue;"></font>else {
me = <font style="color:blue;">false</font>;
}
}
wouldn't you prefer declare me as a bool& or even a bool* instead ?
TOXCCT >>> GEII power
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cool comment !!, 
Written by: Rafael Fernández López.
void life ( bool me, bool her )
{
if ( her )
{
me = true ;
}
else
{
me = false ;
}
}
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