Why CMainFrame can't accept WM_COPYDATA?

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  - 1
    - File Handling and Caching I am writing a C/C++ application that opens a set of files and reads/writes to these files in chunks/blocks called pages. There are two specific types of files used to store different sets of information. There are data files used to store the logical data records and index files used to store index references to the logical data records in the data file. The data file pagesize is determined by whether its storing variable or equal size records. For this discussion, we can ignore variable length data files and assume that data file pagesize is equal to a record size. For the index files, the pagesize is equal to the disk's block size and the index engine uses this to determine the number of index entries that can exist on a single page, etc. NOTE: The application that is handling the access to these files is running multiple threads, so critical sections will be used to aid in the reader/writer paradigm. Now, if I want to be able to prevent unnecessary disk reads by implementing some form of a page cache, is it worthwhile to spend time on developing this "cache" functionality myself or utilize the win32 memory mapped file logic to handle this? By allowing the operating system to handle this, it means that I do not have to worry about it and that I just access the file as if it were memory pointers; however the limitation is that if the file needs to be grown because a new record is to be added, then the file has to be locked, unmapped, grown, remapped, and unlocked for the next operation to take place. By handling this myself, I then have to read the block of information from disk, store it in memory and be able to access the memory buffer when a thread references the page and occationally write dirty memory buffers to disk. But this gives me the flexibility of growing the files as needed without having to unmap/remap the file. Both cases have their pros/cons and I was curious what others thought would be the right avenue to go. Thanks in advance! Chris Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232886
  - 2
    - static member variable access Can someone explain what I'm doing wrong? The following simple snippet illustrates my problem. The linker gives the error "unresolved external symbol 'private: static int CStaticTest::m_Count' ". I'm using VC++ 6. class CStaticTest { public: CStaticTest(); ~CStaticTest(); private: static int m_Count; }; CStaticTest::CStaticTest() { m_Count++; } CStaticTest::~CStaticTest() { m_Count--; } Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232880
  - 3
    - Static class Hi, If we have a static class. Can we change the value of it's member variables during the run time? Example: static CDbMap theMap; Thanks, Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232876
  - 4
    - MoveFile() function not working for directory? Hi, I want to call MoveFile() in my vc++ program to copy a directory. MoveFile() doc said the function can do it. But I tried to both the following and neither works:\ 1) char sFrom = "c:\\mytest\\"; char sTo="c:\\newtest\\"; CreateDirectoryA(sTo, NULL); MoveFileA(sFrom, sTo); 2) char sFrom = "c:\\mytest\\*"; char sTo="c:\\newtest\\"; strcat(sTo, "*"); CreateDirectoryA(sTo, NULL); MoveFileA(sFrom, sTo); Note sFrom is an exiting dir with files inside. The problem is that I always got empty sTo directory, i.e. the files are never copied. What is the problem here? Thanks, Peter Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232875
  - 5
    - Visual C++5.0 and Windows Professional XP Programs written with Microsoft Visual C++ 5.0 will not compile with Windows Professional XP and always generate an error message saying that there is a missing *.dll file. Do I have to get Visual C++.NET in order to be compatible with Windows XP I have used the so called compatibility wizard which does not work either. Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232870
  - 6
    - Question about static functions Hey guys and girls, this is more of a alt.comp.lang.learn.c-c++ but I'm more interested in how the VC++ .NET compiler deals with this sort of thing. Anyways, I wanted to know what the difference between a static and a ummm... not static 0.o function is. here's the code: // Proto's static int StaticGetFive(void); int NotStaticGetFive(void); // Func's int StaticGetFive(void) {return 5;} int NotStaticGetFive(void) {return 5;} They are NOT in a class, since I know that in a class static keyword is very different from this version (static in class makes it ummm... a none instancible function... well... you know what i meen ~.^). My guess is that static just ensures that the function cannot be accessed outside of the obj file (the compiled cpp file) and that it is entirly a syntaxtical statement (doesn't actually add or change anything in the generated assembly code). I have been known to be wrong on occation... not often but it happends ^.~ So I figured you guys and gurls could help my clear this up. Also I'm wondering if this will change the way a function pointer to the function will act. I'm guessing that since static or the ... normal version of these two functions could still be called from outside the compiled cpp file, if we had the right function pointer, the "NotStaticGetFive" is actually being defaulted to a static function (since inline, or extern, etc... isn't infront of the Prototype). Anyways, feel free to ramble on, cause any and all information will help ;) Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232857
  - 7
    - Growing and shrinking a partition To grow a partition, this is what I use (and it works just as expected): 1. IOCTL_DISK_GROW_PARTITION, then 2. FSCTL_EXTEND_VOLUME But now, I want to shrink a partition. Logically speaking, it's a reverse steps above, isn't it? First, to shrink the volume, then to shrink the partition. Unfortunately, neither do I find FSCTL nor IOCTL control code to shrink a partition. Any idea? Please advice, thanks! -P Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232855
  - 8
    - coloring controls how do i get the buttons on my control colored.Is there a way.I also want to now if i can run small gif files on the dialog.If possible provide me with some code.Thanks in advance .Bye Jeevan Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232849
  - 9
    - Memory leakage and the stack? I'm using Visual C++ 6.0 and the debugger is reporting memory leaks. I go to the line it references and it is within one of my methods. The line it points to is: rect = new CRect(0, 0, vidWidth,vidHeight); At the very start of the method I have: CRect rect; I was thinking rect would be automatically deallocated on method exit. Do I have to deallocate the memory rect is pointing to? When I try either delete rect; or delete [] rect; at runtime I get a 'user breakpoint encountered' dialog box, but I set no breakpoints at the line where I delete the rect variable. So should the memory rect points to be automatically deallocated upon method exit, and if not then why can't I delete it with the delete [] rect or delete rect statements? Thanks! [Tim] Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232844
  - 10
    - Binary read/write to a PCMICA (PC Card) Hi, Anyone know how to binary read and write to a PCMICA/PC Card/linear flash card in a laptop PC. The card does not have a FAT and I just like to have binary access to the whole card. Hope some one can give me a tip. Best regards Tom Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232842
  - 11
    - Problem in compiling a VC++ Studio Project on VC++.Net Plateform. Hi, I'm upgrading a VC++ Studio Project on VC++.Net Platform. In this project, it has been used "byteSafeVector". and so related header file "T_SafeVector.h". There is no build problem on VC++ Studio 6.0 Platform. But when I'm compiling it on VC++.Net 2003 Platform, I find following error messages- d:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\T_SafeVector.h(74) : warning C4346: 'TNContainer::iterator' : dependent name is not a type prefix with 'typename' to indicate a type d:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\T_SafeVector.h(119) : see reference to class template instantiation 'T_SAExtractScaler<TNContainer,TNDataType>' being compiled d:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\PlatformSDK\Include\T_SafeVector.h(74) : error C2061: syntax error : identifier 'iterator' Obviously I can't modify the header file by prefixing typename at those errors & warning places. These errors & warning are in following way in T_SafeVector.h //t_safevector.h file .... void GetFromContainer ( TNContainer& _cont, void * pData, TNContainer::iterator walk, <=warning C4346: 'TNContainer::iterator' : dependent name is not a type ...... ..... Kindly help me. Ram Kumar Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232841
  - 12
    - Use SEH error When trying to use SEH in VC++, it gives an "error C2712: Cannot use __try in functions that require object unwinding." What's the cause of the error? What's "object unwinding"? Thanks! Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232835
  - 13
    - bitfield optimizations Hi, everybody. Is it possible to tell vc compiler to ignore bitfields, that is to treat them just as normal variables? I need to run purify on my program and in trips over all the variables that are packed into bitfields saying it is an uninitialized memory reference. There are so many messages like this, that to track real UMRs is impossible. thanks in advance Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232828
  - 14
    - Using excel automation with a namespace I am doing Excel automation. If I include the .h file for Excel in a .h file as below I get error messages like: error C2011: '_Application' : 'class" type redefinition. _Application is an Excel class defined in excel9.h. #include "..\eserver\excel9.h" // needed for excel Thinking that this name conflicted with another name I wrapped the excel.h with a namespace as below to avoid the conflicts. namespace excel { #include "..\eserver\excel9.h" // needed for excel } This produces errors like: error LNK2019: unresolved external symbol "public: struct IDispatch * __thiscall excel::_Application::GetWorkbooks (void)" (?GetWorksbooks@_Application@excel@@QAEPAUIDispatch@@XZ) referenced in function "public: bool __thiscall CPrintOrder::custom_order_form_create_pages_excel(void)"(?custom_order_form_ create_pages_excel@CPrintOrder@@QAE_NXZ) If I put the excel.h include in a .cpp file it compiles and links fine. I prefer it to be in the .h file because I want to share a structure that contains Excel objects in it. What is causing the problems with the type redefinitions? If I use the namespace excel why is the linker objecting to that and how do I get around it? =================================================== Zachary Hilbun Software Consultant http://www.vianova.com Via Nova OpenGL, Open Inventor 3D products, Windows 95/NT Dallas, Texas VC++, C#, embedded systems, VxD's 1977 SSII SRX31185 G30 Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232827
  - 15
    - Socket question.... Hi, I came across this wierd situation recently: One of our cutomers, has dual NIC cards on all of their machines. The NIC cards are "Teamed" to provide extra bandwidth and fault tolarence. These are Broadcom NetXtreme Gigabit Ethernet cards running on driver v2.78. When our software is run on these machines, the machine stops responding after some time (approx 13-14 mins). The machine cannot be pinged as well. If our software is run on the same machine without the "Teaming", i.e. only one nic card is used, it runs fine. The OS was windows 2000 server in both the cases. Our software makes use of SOAP and windows socket to comminucate with other servers. Is this a know pattern? Does any body have any idea how to resolve this issue? Thanks in advance. Regards, Soumitra. Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232826
  - 16
    - CreateProcessAsUser (error 1314) I have a problem with CreateProcessAsUser. It always returns me the error code 1314 ("A required privilege is not held by the client"). My application needs to change the privileges to administrator privileges of the current process. So I use ImpersonateLoggedOnUser (this part goes well). Besides, it has to launch several commands, so I have to use CreateProcessAsUser (because I saw that ShellExecute or WinExec don't inherit privileges). To create the new process I duplicate the token that use to Impersonate converting it to primary token. Furthermore, I put the SE_ASSIGNPRIMARYTOKEN_NAME and SE_INCREASE_QUOTA_NAME on token, because I read that it needs, but nothing happens. The error is still here. Does anyone can help me? What it's happening? How can I resolve it? Here it's the code that I use: if (!RevertToSelf()) return false; // Get the current process token handle... if( !OpenProcessToken( GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken )) return false; if (!SetPrivilege(hToken, SE_TCB_NAME, true)) return false; if (LogonUser(szUsername, szDomain, szPassword, LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, &hAdminUser)) bUserAuth = true; else bUserAuth = false; if (bUserAuth) { if (!ImpersonateLoggedOnUser(hAdminUser)) MessageBox(NULL, TEXT("Inpersonate Error"), TEXT(""), MB_OK); ///////////////////////////////////////////////// if (DuplicateTokenEx(hAdminUser, MAXIMUM_ALLOWED, 0, SecurityImpersonation, TokenPrimary, &hAdminPriv) == 0) MessageBox(NULL, TEXT("duplicate token Error"), TEXT(""), MB_OK); if (!SetPrivilege(hAdminPriv, SE_ASSIGNPRIMARYTOKEN_NAME, true)) { MessageBox(NULL, TEXT("SetPrivilege Error"), TEXT(""), MB_OK); return false; } if (!SetPrivilege(hAdminPriv, SE_INCREASE_QUOTA_NAME, true)) { MessageBox(NULL, TEXT("SetPrivilege Error"), TEXT(""), MB_OK); return false; } TCHAR szRes[MAXSTRINGLEN]; STARTUPINFO si; PROCESS_INFORMATION pi; ZeroMemory( &si, sizeof(si) ); si.cb = sizeof(si); ZeroMemory( &pi, sizeof(pi) ); my_strcpy(szRes, TEXT("C:\\Archivos de programa\\Inquiero Installable ISD\\prova.exe")); if (!CreateProcessAsUser(hAdminPriv, NULL, szRes, NULL, NULL, TRUE, DETACHED_PROCESS|IDLE_PRIORITY_CLASS, NULL, NULL, &si, &pi)) { TCHAR szError[MAXSTRINGLEN]; wsprintf(szError, TEXT("%d"), GetLastError()); MessageBox(NULL, szError, TEXT(""), MB_OK); } } Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232817
  - 17
    - Template code works with g++ but not MSVC++ The following code: class ABC { std::list<ABC> mylist; }; compiles in g++ without a problem. However, VC++ version 6 (latest service pack), complains about the class ABC not being defined on the line where the list is declared. I tried adding a class ABC; statement before the class definition, but it had no effect. I understand this problem is due to the fact that the template parameter of mylist is in fact the class of which mylist is a member. Is this a problem in microsoft's implementation, or is this normal behaviour and the fact g++ accepts it is an extension? Are there any simple workarounds? I need to get this code to work with both compilers. Thanks Pierre Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232812
  - 18
    - Add a control to a single cell of DataGrid Hi all, is it possible to add a control of my choise (e.g., ComboBox or Button) to a single cell of a Forms::DataGrid? I understand how to add a control for a whole column. But I want to add, say, a button in cell (3,4), without having buttons in all of column 4. Thanks, Matt. Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232794
  - 19
    - Link error when using standard functions in VS.NET Assembly in a window or console app in VS.NET2003, I have no problem to use unsigned char *data; data=(unsigned char *)malloc(2000); But in an Assembly, when compiling it, I got error LNK2001:unresolved symbol "void* __cdeclmalloc(unsigned int)" (?malloc@@J0YAPAXI@Z) fatal error LNK1120: 1 unresolved externals when using File _open(...) or _read(...), I got similar problem. Can you tell why and how to fix? Thanks Keith Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232782
  - 20
    - RAS Client I desperatly need to make some client software for my ISP. I have tried using RAS from VB.NET and C# with no luck, and so I have to turn to C++. As some have seen, I'm not the greatest with C++ yet, so I was wondering if anyone had a good example of makeing a C++ wrapper for RAS that I can export the function to call from VB/VB.NET or C#. Thank You, Tibby Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232781
  - 21
    - get a window handle from an Instance handle Hi, I got some difficulties in getting a window handle from an instance handle in Win32 API/C. I used the approach stated in the knowledge base article 242308 -- how to find a window handle from an instance handle, but I found nothing even though I went through the whole window (TOP level windows) handles. I found the instance handle is a 9-digit long integer, and the other process IDs returned by GetWindowThreadProcessId are only three or four digits long. Is it normal? I appreciate your any ideas! Hu Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232778
  - 22
    - Handle to a Process's Window Does anyone know how to get the window handle to a processes main window? I create a process using CreateProcess and I would like to destroy it by sending a WM_QUIT message to the main window. Thanks. Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232774
  - 23
    - Embed an exe inside an ActiveX control ? Hi: Anyone knows how to embed an exe file inside an ActiveX control ? I would like the activex control to be downloaded and execute the exe file on the user machine. Thanks in Advance Polaris Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232772
  - 24
    - Template template argument I am sorry if this has been asked before, I couldn't find it right away, that's why I'm posting here. This code: --------------------- template <typename NumType, template <typename T> class DerivedType> class Matrix { public: NumType operator()( const int row, const int col ) const; NumType& operator()( const int row, const int col ); }; template <typename NumType> class GeneralMatrix : public Matrix<NumType, GeneralMatrix> { public: GeneralMatrix(int,int) {} }; int main() { GeneralMatrix<double> matrix(3,3); matrix(1,1) = 2.0; } ---------------------- VC++ 7.1 refuses to compile complaining about the use of 'GeneralMatrix' as the second argument to 'Matrix' in the template definition. Is that a [known] bug or am I missing something? The situation came up while I was answering a question about operator(), not about template template arguments, but still... Thanks. Victor Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232746
  - 25
    - Get Accont type. Hi all, I need know if the current user loged have a administrator privilegies? How I get this. Get account of currente user. Thanks Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232741
- Next
  - 1
    - .def file and C++ Hi, I have a question about the "C++" symbol export. Is it possible to export some "C++" symbols (classes) using .def file (instead of __declspec(dllexport)) ? Thanks George Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232734
  - 2
    - Format and quick format Hi, What's the windows API to perform formatting or quick formatting of a floppy, a partition, or a volume? Please advice, thanks! -CL Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232733
  - 3
    - user defined data type in com dll Hello I am writing a com dll, i am trying to use a structure variable in on of the interface but it gives me error on compilation. I just wanted to know whether i can use user defined data types in interface of com dll. [id(5), helpstring("method GetData")] HRESULT GetData([in] WAYPOINTS &wp); I get the following error expecting a type specification near "WAYPOINTS" Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232730
  - 4
    - Perl syntax coloring in Visual Studio 6.0 Hi, Does anyone have the usertype.dat file for the perl syntax ? Does anyone knows a different way to highlight the perl syntax in visual studio 6.0 ? Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232728
  - 5
    - Dialogbox did not show up. Please help!!! Hi, I am implementing a Win32 DLL project. In this dll I developed a dialogbox. In order to export the dialogbox, I did the following things. 1. define a function called Test() int Test() { return DialogBox(NULL, MAKEINTRESOURCE(IDD_DIALOG),NULL, DlgProc); } 2. export this Test() function. The problem I encountered was the dialogbox did not show up. The DialogBox() returned a -1 indicating it failed to create the dialogbox. So I called GetLastError() and got the error code 1812, which indicates "The specified image file did not contain a resource section.". I am pretty sure the Test() function was successfully exported because I got some results if I replace the DialogBox() with other functions. I stuck there for tens of hours so if you have any clues or ideas, please drop me a line. I deeply appreciate your help. THanks, Hu Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232717
  - 6
    - VC++ standard compliance Is it legal to compile the attatched code? More specificlly, are the calls to f() properly resolved? Please explain why in either case. begin 666 main.zip M4$L#!!0``@`(`'(-ZS!4`K)IL@```%H"```(````;6%I;BYC<'"]D,T.@C 0 MA,]MTG?8(Q CGLM)PEF?H:W\-(%B^J,'P[N[!4),O(J;7F:FFW[3//_I,,JH MZH5S4#+Z8O0>9*\59Y0\1GV#)H$4U&B<!]_9\8D2([Q')D:G(F[G>P%5P&'! M^6+#$YPV+92<-\5B;+Q_`-3&PR"T833!EU 10BYAD+6]-F?;AJ$VWATP4IVP M64;(9LZLZ5R'5" BNSA&ZK5%M?ZVC%I^)K;VP1HXH9QVJ?4&4$L!`A0`% `" M``@`<@WK,%0"LFFR````6@(```@``````````0`@( ```````&UA:6XN8W!P 64$L%!@`````!``$`-@```-@````````` ` end Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232715
  - 7
    - Static libs Hello all ! I want to create a static lib. In it, i'm calling a function (lets say 'xzy') that is in another static lib... So I included it in the project and I compiled... it compiled fine.. When I write a client that uses my lib, it complains that it cannot link the 'xyz' function (unresolved)... So the client have to include the lib where 'xzy' is implemented... Is there a way for the function body 'xyz' be included in my static lib so that clients that will use my lib won't have to include all other libs that my lib uses !? Mike Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232709
  - 8
    - Slow file transfer ... Hi, I am writting a program using WinSock2 to transfer files, the program seems work fine when the file is not that big. But when I tried it with a 370M file, it's too slow that I can tell the transferrred file increase it's size about 1200byte each time. I used TransmitFile() in putting file, here is how I use the function: if(!TransmitFile( m_socket, hFile, 0, 0, NULL, NULL, 0 )) { CloseHandle(hFile); throw CCException( CWsaerr(), WSAGetLastError(), _T("Falied to transmit file") ); } I am not sure if the slow transfer is from this function call. Even I increase the buffer size of receiving side (I used recv() ), it seems no effect. So I suspect it. One of my collegues said MTS may limit the transfer to about that speed, but I am not sure. Any idea? If TransmitFile() does cause this slowing down, any ways to fix it? Or I have to go back to use traditional send() to send? Any comments or suggestions? Thanks, Peter Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232699
  - 9
    - Passing structs across a dll to vb projects Hi again, How i can pass one structs to vb projects?? Thanks. Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232689
  - 10
    - richedit(?1) + windows 98 + em_replacesel = codepage problem I have richedit (control) with some russian text in it. Then I make a selection - SendMessage(Handle, EM_EXSETSEL, 0, ...)); And then I replace a selection - SendMessage(Handle, EM_REPLACESEL, 0, buffer) with some russian text. The result is OK on windows2000 and NT, but on windows 98(russian edition) inserted text is in wrong codepage (appeared as unreadable abracadabra). so help me please. -- --- With best wishes, Kirill. * ...chasing dreams... Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232684
  - 11
    - deadlock on SMP machines - perhaps caused by wldap32.dll? Hello, Apologies in advance, this is a very long post, but I'm trying to be as complete as possible. I'm also not sure if this is the correct group, but it seemed appropriate. We have a process that runs as part of our product that has been working fine on Windows. However, we recently had an issue onsite where these processes (there are usually multiple instances) would hang and become completely unresponsive on SMP (Compaq 8-way) machines running Windows NT and 2000. I've managed to recreate the issue in our test lab on a dual Xeon (hyperthreaded) box running Windows 2003. There is definitely some sort of deadlock situation here, but I'm at a loss how to proceed after banging my head against this for a week now. There is some evidence that suggests the DllInit function of wldap32 is somehow a player in this - the details are further down. First, let me provide a little context: This service (it's not really an application) is written in VC++ 6.0, and is spawned via a daemon that is also part of our application. In a typical deployment there is one of these service processes for each processor on the local machine. The service instantiates a Java Virtual Machine via JNI, and most of our core code executes within the VM. One of the functions of this service is to spawn processes and feed them input and capture their output. This is acheived by the VM loading a VC++ 6.0 bridge library, which in turn loads another VC++ 6.0 library (we'll call this the "work library") which does the actual work. When all of the assigned work is through, the work library is unloaded until the next time. The work library is fairly simple, and the core behavior involves invoking CreateProcess (usually cmd.exe, which in my test setup just echoes some msg), and creating threads to write to the input handle, and read from the output and error handles. This has been working on all flavors of Windows (uniprocessor) for quite some time. Now, to the details. Here is the basic sequence leading up to the hang: 1) Process loads the work library 2) Process performs some number of brief "work units" (CreateProcess() + accompanying threads, and then cleanup) happily and healthily 3) Process CPU utilization drops to 0, and there is no more activity, ever. This lockup appears to happen faster when more instances are running. Attaching cdb to these hung processes consistently reveals two scenarios: Scenario A - the "Is wldap32.dll doing something bad?" scenario ---------- The work library thread which called CreateProcess has successfully waited on the process to exit. It waits on an Event that will be set by the thread which reads the output from the process, but that Event is never set. Mainly because those helper threads are stuck. The debugger always has to forcibly break into the process b/c the loader lock is held. !locks reveals two locks in contention: CritSec ntdll!LdrpLoaderLock+0 at 77FC2340 LockCount 8 RecursionCount 1 OwningThread b80 EntryCount 2a ContentionCount 2a *** Locked CritSec WLDAP32!PerThreadListLock+0 at 76F34010 LockCount 1 RecursionCount 1 OwningThread d64 EntryCount 1 ContentionCount 1 *** Locked ---- Stack trace for thread b80: 0f5dfba8 77f43741 77f5d64e 000005a0 00000000 SharedUserData!SystemCallStub+0x4 0f5dfbac 77f5d64e 000005a0 00000000 00000000 ntdll!ZwWaitForSingleObject+0xc 0f5dfbe8 77f42044 000005a0 76f1129f 76f34010 ntdll!RtlpWaitForCriticalSection+0x126 0f5dfbf0 76f1129f 76f34010 00000000 0f5dfc1c ntdll!RtlEnterCriticalSection+0x46 0f5dfc00 76f11257 00000b80 77f47dc9 76f10000 WLDAP32!AddPerThreadEntry+0x2f 0f5dfc08 77f47dc9 76f10000 00000002 00000000 WLDAP32!LdapDllInit+0x3e 0f5dfc28 77f5d067 76f11180 76f10000 00000002 ntdll!LdrpCallInitRoutine+0x14 0f5dfcbc 77f5cef6 0f5dfd30 0f5dfd30 00000000 ntdll!LdrpInitializeThread+0xd4 0f5dfd1c 77f45241 0f5dfd30 77f40000 00000000 ntdll!LdrpInitialize+0x171 00000000 00000000 00000000 00000000 00000000 ntdll!KiUserApcDispatcher+0x7 To me, this begs the question: why is this library referred to in the first place? We certainly don't use LDAP and we aren't using ActiveDirectory, either. 'lm' reveals that it is an unloaded module. My only guess is that the library init routine is called in order to see if LDAP is enabled in case it's needed to check process/thread creation security tokens. The interesting thing about WLDAP32!PerThreadListLock+0 is that the owning thread (d64) is nowhere to be found! So, no stack trace. There are several other threads waiting on locks. None of them are in my input/output/error read/write user code, they are all in LdrpInitialize or kernel32!ExitThread. I suspect the exiting threads are mine. 5 threads have the same trace (with differing addresses, but waiting on the same critical section - 77fc2340): 0f6dfbec 77f43741 77f5d64e 00000330 00000000 SharedUserData!SystemCallStub+0x4 0f6dfbf0 77f5d64e 00000330 00000000 00000000 ntdll!ZwWaitForSingleObject+0xc 0f6dfc2c 77f42044 00000330 77f5cfcc 77fc2340 ntdll!RtlpWaitForCriticalSection+0x126 0f6dfc34 77f5cfcc 77fc2340 00000000 7ffdf000 ntdll!RtlEnterCriticalSection+0x46 0f6dfcbc 77f5cef6 0f6dfd30 0f6dfd30 00000000 ntdll!LdrpInitializeThread+0x2f 0f6dfd1c 77f45241 0f6dfd30 77f40000 00000000 ntdll!LdrpInitialize+0x171 00000000 00000000 00000000 00000000 00000000 ntdll!KiUserApcDispatcher+0x7 And here are the exiting threads: c18: ---- 0e0dfe70 77f43741 77f5d64e 00000330 00000000 SharedUserData!SystemCallStub+0x4 0e0dfe74 77f5d64e 00000330 00000000 00000000 ntdll!ZwWaitForSingleObject+0xc 0e0dfeb0 77f42044 00000330 77f7c658 77fc2340 ntdll!RtlpWaitForCriticalSection+0x126 0e0dfeb8 77f7c658 77fc2340 00000000 7ffa4000 ntdll!RtlEnterCriticalSection+0x46 0e0dff44 77e57eb3 00000000 0c0bd418 00a87b88 ntdll!LdrShutdownThread+0x30 0e0dff7c 77bc917d 00000000 77bc91f3 00000000 kernel32!ExitThread+0x41 0e0dff84 77bc91f3 00000000 00000000 00000000 msvcrt!_endthreadex+0x25 0e0dffb8 77e4a990 00a87b88 00000000 00000000 msvcrt!_endthreadex+0x9b 0e0dffec 00000000 77bc917e 00a87b88 00000000 kernel32!BaseThreadStart+0x34 9cc: ---- 0e1dfe70 77f43741 77f5d64e 00000330 00000000 SharedUserData!SystemCallStub+0x4 0e1dfe74 77f5d64e 00000330 00000000 00000000 ntdll!ZwWaitForSingleObject+0xc 0e1dfeb0 77f42044 00000330 77f7c658 77fc2340 ntdll!RtlpWaitForCriticalSection+0x126 0e1dfeb8 77f7c658 77fc2340 00000000 7ffa3000 ntdll!RtlEnterCriticalSection+0x46 0e1dff44 77e57eb3 00000000 0b2e6c48 0b38b590 ntdll!LdrShutdownThread+0x30 0e1dff7c 77bc917d 00000000 77bc91f3 00000000 kernel32!ExitThread+0x41 0e1dff84 77bc91f3 00000000 00000000 00000000 msvcrt!_endthreadex+0x25 0e1dffb8 77e4a990 0b38b590 00000000 00000000 msvcrt!_endthreadex+0x9b 0e1dffec 00000000 77bc917e 0b38b590 00000000 kernel32!BaseThreadStart+0x34 I can provide further information if it is needed. ------------------------------------------------------------------------------- Scenario B - the "what happened to the malloc lock?" scenario ---------- As in scenario A, the work library thread which called CreateProcess has successfully waited on the process to exit. It waits on an Event that will be set by the thread which reads the output from the process, but that Event is never set. These helper threads are also stuck, but this time they are actually in user code. The debugger does not have to forcibly break into this process. !locks only reveals one lock in contention: CritSec MSVCRTD!__app_type+34 at 10264780 LockCount 1 RecursionCount 0 OwningThread 0 EntryCount 4 ContentionCount 4 *** Locked The owning thread is 0. Uh oh. My two helper threads also happen to be waiting on this lock: ea8: ---- 0f2eed90 77f43741 77f5d64e 00000680 00000000 SharedUserData!SystemCallStub+0x4 0f2eed94 77f5d64e 00000680 00000000 00000000 ntdll!ZwWaitForSingleObject+0xc 0f2eedd0 77f42044 00000680 1020b5a3 10264780 ntdll!RtlpWaitForCriticalSection+0x126 0f2eedd8 1020b5a3 10264780 0f2eeec4 0f2eee18 ntdll!RtlEnterCriticalSection+0x46 0f2eede8 1021352a 00000009 0f2efed8 0f2eee74 MSVCRTD!_lock+0x93 0f2eee18 102134ce 0de09de0 00000001 0f2eee34 MSVCRTD!_free_dbg+0x2a 0f2eee28 104bd0ed 0de09de0 0f2eee44 104ad0f0 MSVCRTD!free+0xe 0f2eee34 104ad0f0 0de09de0 0f2eeec4 0f2eee5c MSVCP60D!operator delete+0xd 0f2eee44 1048be9e 0de09de0 00000021 ffffffff MSVCP60D!std::allocator<char>::deallocate+0x10 0f2eee5c 10489b71 00000001 0f2eeec4 0f2efee4 MSVCP60D!std::basic_string<char,std::char_traits<char>,std::allocator<char> >::_Tidy+0x6e 0f2eee6c 0c0e3c99 0f2eff74 0f2efeec 0de09ce0 MSVCP60D!std::basic_string<char,std::char_traits<char>,std::allocator<char> >::~basic_string<char,std::char_traits<char>,std::allocator<char> >+0x11 0f2efee4 0c0d9ddb 00000000 00000000 0de09ce0 worklib!NullCopyRunner::run+0x119 0f2eff84 1020bf53 0de09c98 00000000 00000000 worklib!JobThread::execute+0x4b 0f2effb8 77e4a990 0de09ce0 00000000 00000000 MSVCRTD!_beginthreadex+0x133 0f2effec 00000000 1020bee0 0de09ce0 00000000 kernel32!BaseThreadStart+0x34 7d0: ---- 0f1ee64c 77f43741 77f5d64e 00000680 00000000 SharedUserData!SystemCallStub+0x4 0f1ee650 77f5d64e 00000680 00000000 00000000 ntdll!ZwWaitForSingleObject+0xc 0f1ee68c 77f42044 00000680 1020b5a3 10264780 ntdll!RtlpWaitForCriticalSection+0x126 0f1ee694 1020b5a3 10264780 00000021 0f1ee6d8 ntdll!RtlEnterCriticalSection+0x46 0f1ee6a4 102129da 00000009 00000000 0f1ee7cc MSVCRTD!_lock+0x93 0f1ee6d8 102129a6 00000021 00000001 00000001 MSVCRTD!_nh_malloc_dbg+0x2a 0f1ee6f4 1020e2cf 00000021 00000001 0f1eff44 MSVCRTD!_nh_malloc+0x16 0f1ee708 104b7a69 00000021 0f1ee728 104ad0d2 MSVCRTD!operator new+0xf 0f1ee714 104ad0d2 00000021 00000000 0f1eff44 MSVCP60D!std::_Allocate+0x19 0f1ee728 1048ba18 00000021 00000000 00000000 MSVCP60D!std::allocator<char>::allocate+0x12 0f1ee770 1048bccc 00000017 00000000 0f1eff44 MSVCP60D!std::basic_string<char,std::char_traits<char>,std::allocator<char> >::_Copy+0x58 0f1ee784 1048a005 00000017 00000001 0f1eff44 MSVCP60D!std::basic_string<char,std::char_traits<char>,std::allocator<char> >::_Grow+0x10c 0f1ee798 1048a060 0c136674 00000017 0f1eff44 MSVCP60D!std::basic_string<char,std::char_traits<char>,std::allocator<char> >::assign+0x15 0f1ee7ac 10489ad7 0c136674 0f1eff44 0f1eff84 MSVCP60D!std::basic_string<char,std::char_traits<char>,std::allocator<char> >::assign+0x20 0f1ee7bc 0c0d9e1f 0c136674 0f1eff40 1020d797 MSVCP60D!std::basic_string<char,std::char_traits<char>,std::allocator<char> >::basic_string<char,std::char_traits<char>,std::allocator<char> >+0x27 0f1eff84 1020bf53 0de09ba8 00000000 00000000 worklib!JobThread::execute+0x8f 0f1effb8 77e4a990 0de09bf0 00000000 00000000 MSVCRTD!_beginthreadex+0x133 0f1effec 00000000 1020bee0 0de09bf0 00000000 kernel32!BaseThreadStart+0x34 So it appears that the malloc/heap/whatever-you-call-it lock is somehow munged. None of the other threads reveal anything interesting. ------------------------------------------------------------------------------- Summary: I considered the possibility of heap contamination, but using gflags I enabled full page heap and every other form of heap checking, but there appear to be no problems there. I am suspicious that there is something else at work because these scenarios happen exactly the same every time. As I mentioned before, this code has been working perfectly on Windows uniprocessor systems for more than a year now. The only variable is the multiprocessor environment. I am seriously thinking that this is system related. I've noticed that there have been some deadlock related fixes for wldap32.dll, including a recent hotfix that postdates the release of Windows 2003. I'm wondering if this would fix our problem? I eagerly await any new ideas on this issue! I am pretty much out of them at this point. If I can provide further information on this, please ask. Thanks for reading! Regards, Marc Tag: Why CMainFrame can't accept WM_COPYDATA? Tag: 232683
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Hi!

I use WM_COPYDATA in CMainFrame,

I use the ClassWizard to make following:

ON_WM_COPYDATA()
afx_msg BOOL OnCopyData(CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct);
BOOL CMainFrame::OnCopyData(CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct)

The code run naturally but after "SendMessage(dlg->m_hWnd, WM_COPYDATA, 0,
(UINT)(&cds));"
it can't go into the function "BOOL CMainFrame::OnCopyData(CWnd*
pWnd,COPYDATASTRUCT* pCopyDataStruct)" why?

Thanks in advance!

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Re: Why CMainFrame can't accept WM_COPYDATA? by hostran

hostran
Thu Jul 22 19:43:35 CDT 2004

Thanks!

"hostran" <lit@hostran.com.cn> Ð´ÈëÓÊ¼þ
news:%239dj3ViaEHA.3204@TK2MSFTNGP09.phx.gbl...
> Hi!
>
> I use WM_COPYDATA in CMainFrame,
>
> I use the ClassWizard to make following:
>
> ON_WM_COPYDATA()
> afx_msg BOOL OnCopyData(CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct);
> BOOL CMainFrame::OnCopyData(CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct)
>
> The code run naturally but after "SendMessage(dlg->m_hWnd, WM_COPYDATA, 0,
> (UINT)(&cds));"
> it can't go into the function "BOOL CMainFrame::OnCopyData(CWnd*
> pWnd,COPYDATASTRUCT* pCopyDataStruct)" why?
>
>
> Thanks in advance!
>
>

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