If you XOR a number even times by itself, you will end up with zero but if you do it odd times, you will be getting the number itself. This logic can be used in many different problems, e.g. finding the odd and even number of times a number occurs and so on.
add the following code: extern “C” { typedef HANDLE HCATADMIN; typedef HANDLE HCATINFO; typedef struct CATALOG_INFO_ { DWORD cbStruct; WCHAR wszCatalogFile[MAX_PATH]; } CATALOG_INFO; BOOL WINAPI IsCatalogFile( HANDLE hFile, WCHAR* pwszFileName ); BOOL WINAPI CryptCATAdminAcquireContext( HCATADMIN* phCatAdmin, const GUID* pgSubsystem, DWORD dwFlags ); BOOL WINAPI CryptCATAdminCalcHashFromFileHandle( HANDLE hFile, DWORD* pcbHash, BYTE* pbHash, DWORD dwFlags ); HCATINFO
I found this code useful when you want to go through each tab and then look into their URLs and so on. You can also quit each tab individually. [sourcecode lang=”cpp”] // Implementation #include #include typedef BOOL (CALLBACK * IEENUMPROC)(HWND hwnd, LPVOID pif, LPARAM lParam); static BOOL CALLBACK EnumIEChildWindows(HWND hwnd, LPARAM lParam) { TCHAR szClassName[100];
LRESULT lResult; UINT nMsg = ::RegisterWindowMessage( _T(“WM_HTML_GETOBJECT”) ); ::SendMessageTimeout( handleToInternetExplorerWindow, nMsg, 0L, 0L, SMTO_ABORTIFHUNG, 1000, (DWORD*)&lResult); LPFNOBJECTFROMLRESULT pfObjectFromLresult = (LPFNOBJECTFROMLRESULT)::GetProcAddress( hInst, “ObjectFromLresult” ); HRESULT hr; CComPtr htmlDoc2; hr = (*pfObjectFromLresult)( lRes, IID_IHTMLDocument2, 0, (void**)&htmlDoc2); if ( SUCCEEDED(hr) ) { IHTMLFramesCollection2 *p; htmlDoc2->get_frames(&p); long lLen; p->get_length(&lLen); for (long i = 0; i < lLen; i++) {
Be careful when using _SECURE_SCL option when integrating your DLLs with DLLs you received from someone else. If you have compiled your dlls with this option but the dlls you use havent, you are most likely going to get a runtime application compatibility error. To fix this just remove this option. When secure SCL is
Below is the code to return the parent id of a process, given a process id. This can be helpful in circumstances when we have to scan all the running processes to find out the spawned processes from another process. [code language=”cpp”] // change this method signature according to your requirements BOOL GetParentPID( DWORD dwParentId,
int Helper_ReturnVms(IVirtualBox *virtualBox) { HRESULT rc; bool bFound=false; /* * First we have to get a list of all registered VMs */ SAFEARRAY *machinesArray = NULL; rc = virtualBox->get_Machines(&machinesArray); if(FAILED(rc)) { SafeArrayDestroy (machinesArray); return -1; } IMachine **machines; rc = SafeArrayAccessData (machinesArray, (void **) &machines); if(FAILED(rc)) { SafeArrayUnaccessData (machinesArray); SafeArrayDestroy (machinesArray); return -1; } for
Sometimes data is also stored as message instead of resources. the easiest way to read this is as below: ofstream myfile; myfile.open (“example.txt”); HMODULE handle = LoadLibrary(“AgentRes.dll”); // dll for reading the file DWORD err=::GetLastError(); for(int i=0;i<10000;i++) { LPTSTR lpMsgBuffer=NULL; DWORD dwRet=FormatMessage( FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_HMODULE, handle, i, // number of the corresponding message // you
Sometimes or most times when you get a crash dump from your customer, its always good to know how to reproduce the crash and point out where the actual crash happens. Today I was debugging some bug with my lead, I found this very useful: Here are the steps: First of all open the windows
This is especially useful when you want to use someone else’s dlls. 1) Open the dll in windows dependency viewer: You should see the following, if its a COM dll. This basically is related to COM. If you go through COM tutorials you will know about this. 1) next open the dll you need in
If you have a situation as above or in clear words If an application has a string localized to multiple languages and mapped to the same ID in each language, the correct version of the string might not be loaded on Windows 95 or Windows 98 using the Win32 function ::LoadString. To load the correct
Recently I had to integrate cppunit and teamcity on linux for running my unit tests. First of all you can either link against and compile cppunit libs to run the tests OR the lazy way to do this is just install cppunit. Do it this way: $ apt-cache search cppunit libcppunit-1.12-1 – Unit Testing Library
One of the instances, your customers or yourself would be using call backs when you need to call a method asynchronously and receive the feedback. When I tell asynchronously, it means like you want to read a huge file[> 100MB] and parse them. I know this consumes a huge amount of memory. Use file handles
I learnt this from my manager. DebugBreak is powerful tool you can use when debugging applications. I had this scenario where I need to use a java app which was internally calling C++ methods, basically JNI functions. The error in question was in the C++ side, so not really an option to use debugger. Therefore
TeamCity treats equally all agents no matter if they are installed on the same or on different machines. However, before installing several TeamCity build agents on the same machine, please consider the following: * Builds running on such agents should not conflict by any resource (common disk directories, OS processes, OS temp directories). * Depending
As mentioned previously, many legacy Windows applications were created so you could access parts of the file system and registry that are now locked in Windows Vista, and many of these applications are not being immediately updated. However, Microsoft has devised an interesting solution within Windows Vista to provide backward compatibility so that legacy software
Above is the error you would be getting when trying to install Microsoft System Center Configuration 2003. I have attached the screenshots of enabling and installing bits. 1) Goto Add remove programs 2) click on windows components 3) goto IIS and double click that.
1) First of all make sure, the exe is running for which you need to know if the dll is loaded. 2) Use the windows API: typedef DWORD ( WINAPI *GETMODULEFILENAMEEX) ( HANDLE, HMODULE, LPTSTR, DWORD ); 3) Open the process: HANDLE myprocess= OpenProcess( PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, myProcessID); Over here you would need to
Description of Listbox: Provides the functionality of a Windows list box. Copy class CListBox : public CWnd Remarks A list box displays a list of items, such as filenames, that the user can view and select. In a single-selection list box, the user can select only one item. In a multiple-selection list box, a range
Below search method will be useful when you need to find a window with no caption. FindWindow will not work correctly in such a instance. You can make use of the below method to do that. //get the handle to the top window HWND h = ::GetTopWindow(0); while ( h) { TCHAR buf[100]; ::GetClassName( h,
When trying to run a subversion or svn service, we get this error stating the service is not running, this is because of the way you create the service: Below are the right and wrong way to create it: WRONG WAY: F:Program FilesSubversionbin>sc create svnserver binpath= “F:Program FilesS ubversionbinsvnserve.exe –service -r F:Dev FilesRepository” displayname= “S
Some tools which I really find helpful are: a. Multimon – Support for multiple monitors b. Process Monitor c. Process Explorer d. Desktops – Desktops allows you to organize your applications on up to four virtual desktops. e. OleView – For COM purposes f. Spy++ – For windows GUI handling g. Resource hunter – Reading
I had an opportunity to use CListbox. The scenario was that I had to pre populate the list box and display it in a pop up window. Its very to use listbox when using it in a parent window but when you want to display it in a standalone pop up window, you would get
You would be getting this error if you tried to use CArray in VC 6. You would need to use some other way to get the values selected in listbox. In my next post I would be showing how to use two different ways to access a CListBox.
One of the simplest ways to detect a leak in your code would be to use debugCRT. Simple usage: a. Create you project in visual studio b. run the project in debug mode, then only you will find the memory leak dumps int main() { _CrtSetDbgFlag(_CRTDBG_CHECK_ALWAYS_DF | _CRTDBG_ALLOC_MEM_DF); //below call will break where the leak
Below is the code to create a registry key in VC++. I used visual studio 2008 for this(VC9) RegCreateKeyEx is the command to create the key. More documentation can be found online@ msdn. #include “stdafx.h” #include “Windows.h” int _tmain(int argc, _TCHAR* argv[]) { HKEY hOutKey; RegCreateKeyEx(HKEY_LOCAL_MACHINE, L”SOFTWARE\ABC\Registration\addkey”, 0, 0, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL, &hOutKey, NULL); return
lets take a look at how to compare two systemtime variables but using Filetime to do so. We make use of the utility method CompareFiletime to do this. 1) store the systemtime in a variable 2) convert it into filetime. Use this method SystemTimeToFileTime(&systemtime1, &filetime1) SystemTimeToFileTime(&systemtime2, &filetime2) 3) Compare the filetimes using the method CompareFileTime(&filetime1,
The easiest way to do this would be to use the option KEY_ENUMERATE_SUB_KEYS when you open the registry key. This option would read both the 32bit and the 64bit registry keys.
This happens usually because in your visual studio vc6 compiler options you would have set the library files path to “Microsoft platform SDKs” , which uses the newer library files. Goto the option again and then set to “Microsoft SDKs” which is set to older SDK. this will help to solve your problem.
I almost gave up searching for this option when I was coding on something. I tried using spy++ and wininspector to do this. These were pretty helpful but not that I could get the end result. Consider this scenario, you have a icon on the taskbar. You need to right click and select an element
The best way is to use runas command: runas /user:test “C:Userstest_restrictedDesktopProcmon.exe”
Below are the compiler types: x86 on x86 (X86 native compiler): Allows you to create output files for x86 machines. This version of cl.exe runs as a 32-bit process, native on an x86 machine and under WOW64 on a 64-bit Widows operating system. x64 on x64 (X64 native compiler): Allows you to create output files
Recently I trying to read a token file(basically a file which considers some encrypted text/plain text containing a password) into a buffer and then read that for verification purposes. Example file as below: <?xml version=”1.0″ encoding=”UTF-8″ standalone=”no” ?> <RSAKeyValue><Modulus>HOYfY2s4gKaT2DbXNgcps3vVfloYz5DzrEK</:Modulus> </RSAKeyValue> </enabled>NULL The above is just a example of the content inside the file. Now I
In order to make calls to a COM method which is implemented using a single threaded model, you would need to use the CoInitialize Function. This basically Initializes the COM library on the current thread and identifies the concurrency model as single-thread apartment (STA). Format is as below: HRESULT CoInitialize( __in_opt LPVOID pvReserved ); Newer
When you need to bring a virtual machine on a domain and test, for ex: when doing firewall testing you can do it as below: Start the VM and go to its settings. Change the network adapter to select, VMnet or NAT and set it Now get into your VM, by turning it on and
Security center is now Action center: Searching for security center in windows 7, you would come up with nothing. All the items over here are shifted to Action Center. Not sure why they did that, but security center was better User Access control: UAC has four stages. Each stage has option to configure the level
For those of you, who dont know about GetSystemDEPPolicy Function, Please refer to this link: http://msdn.microsoft.com/en-us/library/bb736298%28VS.85%29.aspx For others lets see on implementing this: GetSystemDEPPolicy Function Gets the data execution prevention (DEP) policy setting for the system. Syntax in C++: DEP_SYSTEM_POLICY_TYPE WINAPI GetSystemDEPPolicy(void); Describe a typedef in the beginning. typedef DEP_SYSTEM_POLICY_TYPE (WINAPI *ptr_getsystemdeppolicy) (void); Next you
We use handles in most cases when opening up a file, for eg: void methodA() { int xHandle = 0; xHandle = open(“c:windowssys.txt”, O_RDONLY); } If we do not close this handle, we are bound to get a memory leak everytime we call this method. You can verify this by opening up task manager and
I have seen that many people are confused to take out the really annoying windows search deskbar from the the taskbar..Its really easy thing to do. Follow the steps below:1) Right click on the taskbar -> toolbar -> De-select windows search deskbar and you are done.
Incase you get a similar type of error when trying to compile visual studio 2008, goto microsoft.com and download Microsoft platform SDK for windows 2003 SP1. the link is: http://www.microsoft.com/downloads/details.aspx?familyid=A55B6B43-E24F-4EA3-A93E-40C0EC4F68E5&displaylang=en Warning: do not download the file through the download button on the page. Scroll down and you will find some files for download with similar
I was writing some unit test using CppUnit for some methods. I needed to test some methods which was written in windows to manipulate windows services. Below is basically a rough idea on how to do this: One such example is a method which tests the windows service state. Let us call this method TestServiceState():
wbemuuid.lib: compilation errors vc6 One of the errors we often see, when compiling vc6 and when you have included the library wbemuuid.lib, is the recompile module or corrupt error. The best thing to do would be replace this lib in c:Program filesMicrosoft Platform SDKLib This would work fine
Instead of spending money on buying a convertor to play your videos on zune. Download windows movie maker OR I suppose this is a component already on your windows OS. Import videos into your windows video maker. Then save your videos in the WMV format. When done just synchronize your videos with zune. Your done!!!
Try this http://www.appremover.com/ tool.
1) Right click on your project 2) Click on Add new resource 3) In the pop up box, which opens select version. 4) Over here add the version, original filename, company name and so on.
I kept getting the above error. The most logical reason I found was related to my computer. I had installed a Antivirus called spycatcher with an out dated 4.x version. This was preventing most of my exe’s to start or run. This is just a guess. Since I uninstalled this application and everything worked fine.