rookie's question about using clipboard

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  - 1
    - Input Box I thought this would be easy but I can't seem to find an easy way for the standard input box in Win32 API. Like in Javascript or VB, the messagebox like popup comes up but allows the user to enter text. Common dialog Library allows for file open and advance dialogs like that. So I'm guessing there has to be one for an input dialog box. thanks, Adam Tag: rookie's question about using clipboard Tag: 214215
  - 2
    - CTreeCtrl update problem I have the code below. When I select an item, the item does not really get selected until the next time I select something (that could be something else). What is wrong? BOOL CMyOwnBrowseDialog::OnInitDialog() { CDialog::OnInitDialog(); _chdrive(3); if (chdir("C:\\") != 0) MessageBox("FEL", "FEL", MB_OK | MB_ICONERROR); m_StaticDir.SetWindowText("C:"); currentDirName = "C:"; HTREEITEM rootC = m_TreeDirectories.InsertItem ("C:"); if (m_TreeDirectories.Select(rootC, TVGN_DROPHILITE) == 0) AfxMessageBox("Fel", MB_OK); fillChild(rootC); m_TreeDirectories.Expand(rootC, TVE_EXPAND); m_TreeDirectories.SetFocus(); return FALSE; // return TRUE unless you set the focus to a control // EXCEPTION: OCX Property Pages should return FALSE } void CMyOwnBrowseDialog::fillChild(HTREEITEM hParent) { if (m_TreeDirectories.ItemHasChildren(hParent)) return; if (m_TreeDirectories.GetRootItem() != hParent) { if (chdir(m_TreeDirectories.GetItemText (m_TreeDirectories.GetSelectedItem())) == -1) AfxMessageBox("APA", MB_OK); } else { if (chdir("C:\\") == -1) AfxMessageBox("APA2", MB_OK); else AfxMessageBox("KAHFADJKFHK", MB_OK); } CFileFind fileFind; BOOL bWorking = fileFind.FindFile("*.*"); while (bWorking) { bWorking = fileFind.FindNextFile(); if (fileFind.IsDirectory() && fileFind.GetFileName() != ".") m_TreeDirectories.InsertItem (fileFind.GetFileName(), hParent); } } void CMyOwnBrowseDialog::OnClickTreeDirectories(NMHDR* pNMHDR, LRESULT* pResult) { HTREEITEM treeItem = m_TreeDirectories.GetSelectedItem(); CString prevDirName = currentDirName; currentDirName = m_TreeDirectories.GetItemText (treeItem); fillChild(treeItem);AfxMessageBox(currentDirName, MB_OK); CString prevDir; CString newDir = ""; m_StaticDir.GetWindowText(prevDir); if (currentDirName == "..") { int lastDir = prevDir.ReverseFind('\\'); for (int i = 0; i < lastDir - 2; ++i) newDir += prevDir.GetAt(i); } else if (currentDirName != prevDirName) newDir = prevDir + "\\" + currentDirName; else newDir = prevDir; m_TreeDirectories.Expand(treeItem, TVE_TOGGLE); m_StaticDir.SetWindowText(newDir); *pResult = 0; } Tag: rookie's question about using clipboard Tag: 214213
  - 3
    - LoadLibrary Fail Dear all, I have created a COM (hoken.dll) and I also created a simple project to test this component. In the testing project, I use the loadlibrary function to load the library; however, it cannot get the address for this COM, I use the GetLastError function and found the last error no : 3765269347. I have searched in the msdn but there is no information for this error no. Do anyone know what this error no means and how can I solve it? Thank you for all of your help. Alex Tag: rookie's question about using clipboard Tag: 214208
  - 4
    - Comparing wave files Hi All, I have two wave files which I need to compare, both file has the same audio on them but recorded differently (noises at the background, different volume, silence gaps and so on) If you listen to it you can tell it is the same audio easily, I need away to get the similarity between this two files. I am looking for a code, ideas, activeX dll, C library or anything else that can help me accomplish it. Thanks, Avi Tag: rookie's question about using clipboard Tag: 214200
  - 5
    - Wait for file to be done writing Hi, Application 1 writes HTML files, application 2 sets a hook in the HTML files (it knows their names, that's not a point) using FindFirstChangeNotification. When application 1 opens a HTML file, application 2 is notified of a change, so it will show the empty file (rather than the new, finished file), as application 1 truncates the file for the new writing. So I don't really want to wait for the "first change", I want to wait for the "done writing" notification... if it would exist. Application 1 and 2 are both mine (it's actually the same executable binary, but that aside) so I'm happy to solve it on either side if you have any suggestions. What I've been thinking of is to try to open with shareDenyWrite (from within application 2). But there are problems such as: I don't really want application 2 to start running in circles until it can "finally" acquire the shareDenyWrite type open; and: can application 2 actually achieve shareDenyWrite if it is reading the HTML files on a read-only network drive? Thanks, Sander Verhagen [ Verhagen@nonono.Sander.com ] Tag: rookie's question about using clipboard Tag: 214191
  - 6
    - extern and class I have a header file, General.h, that is the only header file for a project that has three .cpp files. General.h has extern definitions for many global variables and function prototypes. General.h also has a single class definition. When compiling I get this error general.h(82) : error C2143: syntax error : missing ';' before '*' when I have the following arrangement extern CBitmapFile * pCBitmap_faces; // other stuff class CBitmapFile { // class contents defn?. }; I do not get error C2143 if extern CBitmapFile * pCBitmap_faces; Comes after the class definition. I thought that extern meant that "I promise I will define all after extern in due course." Thanks. Thomas Tag: rookie's question about using clipboard Tag: 214185
  - 7
    - Can We Set the L-value of in.eof()? It looks like there is a bug in a loop like (while in.eof()) in.getline(line); ... ... {} when we work repeatedly on the same file. We open the file "in" (ifstream), work on it and reach its end of file. When we seekg to the file's beginning, we cannot use the above loop again. It looks like the program has set the in.eof() bit and puts out an empty line each time the second time over. How do we set in.eof() to false? Thanks! Maria Tag: rookie's question about using clipboard Tag: 214182
  - 8
    - Function forwarding Hello, I came across interesting linker behavior while trying to include a function forwarder into my DLL (I use Visual C++ 6.0 SP 5). Suppose I have mydll.dll and I want MyHtonl in this DLL to be forwarded to wsock32.htonl. Also I want to link implicitly (that is, using the import library) with mydll.dll. So I include the following lines into the .def file: EXPORTS MyHtonl = wsock32.htonl I get MyHtonl exported from mydll.dll and mydll.lib contains two symbols: MyHtonl and __imp_MyHtonl. Looks reasonable, but this is not what I want. Since I want to link implicitly and the original htonl uses __stdcall calling convention, I need _MyHtonl@4 and __imp__MyHtonl@4 symbols in the import library. Now when I try to fix it by specifying the decorated name in the .def file EXPORTS _MyHtonl@4 = wsock32.htonl I get pretty interesing results: the name that appears in the export table is _MyHtonl, and the import library contains __MyHtonl@4@4 and __imp___MyHtonl@4@4. Weird. The linker seems to be triggered by '@' character in the function name, so if I write EXPORTS @MyHtonl = wsock32.htonl I get _@MyHtonl@4 and __imp__@MyHtonl@4 in the import library and empty (I never thought this is ever possible) function name in the export table. So, the question is, how it is possible to create a forwarder so that 1) the export table contains the undecorated function name; 2) the import library contains the properly decorated function name for __stdcall calling convention. I know that such forwarders exist in the system images. For example, kernel32.dll forwards EnterCriticalSection to ntdll.RtlEnterCriticalSection and both 1) and 2) are met. I wonder how Microsoft builds it. Do they use a special in-house tool or is it possible to achieve with publicly available tools? -- Alex Fedotov P.S. Of course there is a plenty of ways how to solve my original problem, but now I'm just curious about that linker behavior and if it is possible to forward functions the way I want. Tag: rookie's question about using clipboard Tag: 214180
  - 9
    - Arabic UI I'm running VC++6 with no SP, and I want to be able to use the resource editor to build a dialog box in Arabic user interface, is it possible? -- Essam A.El-Sherif esm-esh@link.net Tag: rookie's question about using clipboard Tag: 214179
  - 10
    - Some Source Code for a Directory/File Lister? Well, I need to change thousands of files for my company in all kinds of ways. I need a piece of code in Visual C++ that allows me to (a) list the files/subdirectories of a directory, (b) highlight some of them, and then (c) perform various string operations to their contents. I can do part (c). I have written all the programs that I need for it. I would appreciate your help. Thanks in advance... Maria Tag: rookie's question about using clipboard Tag: 214178
  - 11
    - Semaphores, Mutexes and EnterCriticalSection in Threads hi i read some article about semaphores and mutex. so i ask myself: WHYdo i need semaphores and mutex in threads...? i found an API EnterCriticalSection and LeaveCriticalSection. why not just use these 2 functions instead of semaphores and mutex??? can anybody explain that to me? thank you, regards, jazper Tag: rookie's question about using clipboard Tag: 214164
  - 12
    - Uniquely identifying a thread *over time* Hi, The context: I have an application in which an object X makes a COM connection to some object. Different threads within the application all call methods on the one single object X that subsequently calls methods on the COM connection. For this a marshall stream is needed, as COM pointers are not thread safe. This marshalling requires some interthread communication which takes time. So I don't want to do that on every method call, but just once for each thread and then store the marshalled pointer mapped to that particular thread (sort of CMap<thread identifier, marshalled COM pointer>). Threads here "don't know" that they are at some point invoking COM communication, so I can't have them store the pointer. Also threads can be terminated and created on user request throughout the lifetime of the application. The question: how do I uniquely identify a thread. And the answer is NOT: thread handle or thread id. These are unique at a certain point in time. They are not over time! (Correct me if I'm wrong, but that's what extensive Googling learned ;-p) (I'm also happy with a different approach altogether. But then just for the pointer problem. I'm not planning on limiting all COM communication to the main thread and have the other threads send/post messages around, as many of you would suggest.) Thanks already, Sander Verhagen [ Verhagen@nonono.Sander.com ] Tag: rookie's question about using clipboard Tag: 214163
  - 13
    - Web Cam Sample Hi. Does anyone know if there's a way to get a Web Cam to draw into a hidden buffer ? I am familiar with the APIs that start with "cap" like capCreateCaptureWindow() that are in "vfw32.lib". But those APIs require a visible Window in order to do anything. I dont want a window because i need to modify the pixels of the frames BEFORE they are shown. I looked at the "DirectShow Samples" , specificaly the sample : "VidCap" but it doesnt specify if its meant to be used as viewer for a WebCam or not. Its also very confusing to follow and Im not sure if that's the road to chose in order to get to my destination. thanks for your time. A.M.A Tag: rookie's question about using clipboard Tag: 214162
  - 14
    - HELP ! How to catch C++ Runtime Errors? How to catch C++ Runtime Errors and find their location occured ?It appeared in release version. Someone can provide good resolution methods? Tag: rookie's question about using clipboard Tag: 214109
  - 15
    - ATL COM Problem Dear all, I have created an COM server and it can be successfully built and generate the dll file; however, when I use regsvr32.exe to register the COM server, no reponse message from the regsvr32! the process still in the task manager but no response to the command window. I want to know why this happen and how to solve this? Thank you for all of your help. Alex Yung Tag: rookie's question about using clipboard Tag: 214106
  - 16
    - Earn $500 to $700 per Week Downloading FREE Software We know it sounds TOO good to BE true, but it?s REAL! Our International Technology firm will pay you hard cash each time FREE software is downloaded. Best of all you will only have to download ONE piece of software ONE time for FREE and you can be on your way to earning BIG! FIND OUT MORE BY VISITING http://JeromeMcCrea.PlugUsIn4Cash.com Tag: rookie's question about using clipboard Tag: 214098
  - 17
    - overloading "=" operator, with volatile struct _HCFS { DWORD HCFS; struct _HCFS operator=( int val); }; struct _HCFS hcfs; hcfs = 1; this is OK, but I define volotile struct _HCFS hcfs; hcfs =1; there is alway a compilation error, saying "no overloading function found for left operator struct _HCFS. any suggestions? thanks pat Tag: rookie's question about using clipboard Tag: 214095
  - 18
    - problems submitting a form for a file upload programmatically Hello, I am having problems posting a form to transmit for a file upload via an HTTPS post, through the IE web browser, however it is successful in wininet. I have created smart pointers to the interface and once a secured connection is established I build a stream buffer (std::strstreambuf) for the form transmission. I am using the header Content-Type: multipart/form-data; and build the buffer with Content-Disposition: form-data; name="<fieldname>"; filename="<filename>" Content-Type: image/* <fileimage> then use the following: std::strstreambuf buff /***** pack upload into buff ****/ /***** create a safe array ******/ BYTE *Data; VARIANT vPostData; LPSAFEARRAY psa = SafeArrayCreateVector(VT_UI1, 0, buffpcount()); hr = SafeArrayAccessData(psa, (void**)&Data); memcpy(Data, post.m_pdata->str(), post.m_pdata->pcount()); hr = SafeArrayUnaccessData(psa); V_VT(&vPostData) = VT_ARRAY | VT_UI1; V_ARRAY(&vPostData) = psa; /** from an IWebBrowser2 instance i extract the App pointer and **/ /*** construct a BSTR with the header **/ /** to use navigate to post the form as follows ***/ IWebBrowserAppPtr::Navigate(bUrl, &vtMissing, &vtMissing, &vPostData, &vHeader); The buffer appears to be transmitted and I receive no errors, however the server is getting a corrupt transmission. What may be wrong with this approach ? Thanks for any assistance, John Seganakis EZ-Filing Inc. segy@ezfiling.com "They that give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." - Ben Franklin Tag: rookie's question about using clipboard Tag: 214078
  - 19
    - #import [out,retval] ? Hello, I wrote an ATL in-proc server for use with VBA and MFC. In the MFC code, I am using #import on the server's type library. MFC complains about interface methods with an [out,retval] parameter. I can add a second copy of the method to the interface with a new name and the [out,retval] changed to just [out]. This seems to work. Is there a way to get rid of the errors without adding a bunch of (almost) redundant methods to the interface? -- Bill Swartz, PhD Voss Scientific Tag: rookie's question about using clipboard Tag: 214072
  - 20
    - can't define entry points in DLL Hi, I am writing a managed c++ library under .net. It has one class, brilliantly named Class1 which has one function FtoC. When I put the following line in the .def file EXPORTS ftoc=Class1::FtoC the linker gives the error unresolved external symbol Class1::FtoC What am I doing wrong? Also, I am doing this because I need to know the name of the function inside the dll to call it from lisp. Instead of a .def file, I tried using dumpbin on the dll file, but it didnt show any of the functions. So, I am wondering if there is something I am missing during compilation (like a switch to set). thanks, --unm Tag: rookie's question about using clipboard Tag: 214071
  - 21
    - Self-Restart Executable Hi, Is there a way to self-restart an executable? I have the code for self deleting an executable, where the executable deletes itself at the end of assigned task; but I am not to make it work for self-restart. What I am looking for is that the executable should be able to exit and then restart by itself. Ofcourse, I am not expecting it to retain its previous state, but a new start for executable. Regards Vivek Chopra Tag: rookie's question about using clipboard Tag: 214060
  - 22
    - Modaless dialog + crystal report viewer control when i add a crystal report 9.0 viewer control (Active X control) into the dialog. And then use "CreateIndierect()" to create the modeless dialog. The viewer cannot dislplay successfully. The screen only display the blank dialog. However, I can display the active X control of the viewer if I use DoModal() to create the dialog. So, how can I also display the viewer together with the dialog?? Thx Tag: rookie's question about using clipboard Tag: 214056
  - 23
    - using vector<> and auto_ptr<> in an ActiveX control [VC6-SP5, WinME, ATL DLL] Hello all, I'm in the process of designing an ATL ActiveX control and would like to use auto_ptr<>, vector<>, and deque<> templates. Is anyone aware of any conflicts in doing this? I could hand-roll it, but why reinvent the wheel. Thanks, M Tag: rookie's question about using clipboard Tag: 214053
  - 24
    - mfc wrapper not passing quit message Probably a weird and meaningless topic header :) Here's what I have: my application makes it own windows using win32api and such so I don't need MFC for that. But I do use MFC for a few things (eg easy wizard dialogs). So I cheated and did it the following way (which I assume is the normal way for this) BOOL CMyApp::InitInstance() { //make my windows while (GetMessage(&msg, NULL, 0, 0) > 0) { TranslateMessage(&msg); DispatchMessage(&msg); } //clean up code return FALSE; } Therefore I get MFC functionally without having to use MFC everywhere (I dislike MFC) Ok, now my problem. When windows shutdown I don't receive any notification, ie the clean up code doesn't get executed above. Any ideas on how I can catch the shutdown and therefore do some needed clean up code. When the program exits normally, eg alt-f4 or close button, everything works fine. thanks, Adam Hart Tag: rookie's question about using clipboard Tag: 214050
  - 25
    - templates & optimization consider the following template class: template<bool doit> class myclass { void MyMethod() { if(doit) { ... } } }; myclass<false> m; m.MyMethod(); Q: Would the optimizer (VC7.0) exclude this function call since 'doit' is known at compile time and can be resolved? Regards, DI Tag: rookie's question about using clipboard Tag: 214040
- Next
  - 1
    - Missing Win32 API function In the MSDN documentation supplied with VC++ 6.0 it mentions a function called SetFilePointerEx. If I try to use it the compiler says it's undefined. I've searched in all the header files and can't find it. Is this an MSDN error or is there something else going on here? I notice that it is also mentioned in the latest MSDN edition and that it's also not included in the header files on VS.NET 2003 Regards, Terry Stebbens. Tag: rookie's question about using clipboard Tag: 214028
  - 2
    - Whatever happened to ThemeExplorer on MSDN? The on-line help files contain links to the code for this program but it isn't there. A search turned up nothing. Was it pulled because of some errors? Norm Tag: rookie's question about using clipboard Tag: 214006
  - 3
    - compiling error in C++, Fortran, C -- newbie question I got a executable program from my former colleague who has left my company. Its main function looks like this: int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { int nRetCode = 5; SL_Begin_Process(__argc,__argv, NULL, "Customer_Test", ""); ...... } In this program, it uses C and Fortran code. When I compiled this program in Debug mode, I got the following error: Customer_Test.obj : error LNK2001: unresolved external symbol ___argc Customer_Test.obj : error LNK2001: unresolved external symbol ___argv Debug/Customer_Test.exe : fatal error LNK1120: 2 unresolved externals Error executing link.exe. My question is why these errors occured? In a C program, argc and argv is defined in the main function like int main(int argc, char *argv[]){}. However, I can not find where __argc and __argv are defined. If I compiled in Release mode, it compiles successfully without such error. Any of your help is greatly appreciated. Tony Tag: rookie's question about using clipboard Tag: 213952
  - 4
    - Initialization of Constant Static members In the vc++ 2003 is possible to initialize integral constant static members inside the class structure, according to standar class MyClass { static const int n = 1000; }; But I have tested that in VC++ is NOT obligatory to define space for the variable out of .H const int MyClass::n; Is correct not declare the space for variable? Is according to standar? Thank you in advance Javier Tag: rookie's question about using clipboard Tag: 213924
  - 5
    - global variables How can I define a variable, e.g. "MYPROC MyProc;" so that it can be used in everywhere, in Main.cpp, or Blahblah.cpp? I've tried to declare this variable in a header file, then having both Main.cpp and Blahblah.cpp including this header file, but seems it is not OK to do so, how can I fix this problem? I appreciate any help. David Tag: rookie's question about using clipboard Tag: 213911
  - 6
    - Privileged Instruction exception on QueryInterface Hi, I'm trying to check if a VARIANT* parameter sent from a VB 6 client is an IDispatch value and also which interface it is. This is the code: /* --------------------------*/ if(!(FeatureArguments->vt & VT_DISPATCH)) return E_INVALIDARG; ICSTAForwardingInfo * fwdInfo = NULL; IDispatch * idisp = FeatureArguments->pdispVal; hr = idisp->QueryInterface(IID_ICSTAForwardingInfo, (void**)&fwdInfo); if(hr != S_OK) return E_INVALIDARG; /* --------------------------*/ The ICSTAForwardingInfo interface is implemented in the same DLL, an instance of that is created in VB6 and then passed to the DLL as a VARIANT*. But I'm getting a 'Privileged Instruction' error on the QueryInterface call. Any hints about this issue ? Thanks in advance, -- []'s Raul M. Fragoso Tag: rookie's question about using clipboard Tag: 213908
  - 7
    - How to create a new process for current window program? How to create a new process for current window program? I see that createprocess will execute a program in new process. but I only want to copy current process and do something different. ( just like fork() on unix ) How can I do that?? thanks CYShao Tag: rookie's question about using clipboard Tag: 213906
  - 8
    - Callbacks in DLLs Hello, I'm having trouble about setting up a callback function in a DLL. I'm not sure what I should do to store the pointer to the callback function of the test application from the DLL, so that it will persist after the function DefineCallback() has ended... Here I use extern to try to achieve it but seems I have problems with pointers... This is the code of the DLL: --dll.h typedef int (PASCAL *GENERALCB)(UINT uMsg, DWORD dwSize, int *iStatus, char *lpString1, char *lpString2); extern GENERALCB *MyGeneralProc; HANDLE PASCAL DefineCallback(HANDLE hHost, char *lpFilename, char *lpDest, UINT uOffset, GENERALCB *GeneralProc); --dll.cpp : : HANDLE DefineCallback(HANDLE hHost, char *lpFilename, char *lpDest, UINT uOffset, GENERALCB *GeneralProc) { MessageBox(0, "This is DefineCallback().", "dll.cpp", MB_ICONINFORMATION); MyGeneralProc = GeneralProc; return 0; } What's wrong in my code? How should I correct it so that I can have it running? I'll be glad if somebody can help me. David Tag: rookie's question about using clipboard Tag: 213900
  - 9
    - how to view the stack when there is a messagebox in front Have anyone tried breaking the execution when there is a messagebox popped up my the ::MessageBox(....) function or AfxMsgbox(...) The call stack just shows 7ffe0304() USER32! 77d746fe() USER32! 77d61e6d() Is there any easy way to see the call stack at this point.? thanks fleming Tag: rookie's question about using clipboard Tag: 213885
  - 10
    - DAMAGE: after Normal block I am getting an error that I don't understand. Compiler is VC7 on Windows XP Pro. I am not a c/c++ guru so any help would be appreciated. I have already scanned the newsgroups and understand that this error comes from writing past an allocated memory block, but how am I doing this? void Parameter::ValueDup(double val) { if (value != NULL) delete value; sprintf(temp,"%lf",val); value = strdup(temp); } This is a function in a class named Parameter... The error comes on the last line of the function (strdup). I have checked the variables and everything seems fine. Variable values just before the crash are the following... val = 0.00000000000000000 temp = 0.000000 value = NULL Both "value" and "temp" are class variables originally declared as follows... static char temp[256]; char *value; --> set to NULL in constructor Any ideas? Tag: rookie's question about using clipboard Tag: 213882
  - 11
    - Re: Viewports - Viewport or pspace layout? OOPS wrong group. Sorry! Tag: rookie's question about using clipboard Tag: 213881
  - 12
    - Viewports - Viewport or pspace layout? I am trying to manipulate viewports.. when I perform a blocktableiteraton on each paperspace layout, I get 1 more viewport than I would expect... I presume, therefore, that each paperspace is also a viewport. How can I tell if a AcDbViewport object is a paperspace layout, or if it is, infact, a viewport to model space? Thanks, MS Tag: rookie's question about using clipboard Tag: 213880
  - 13
    - % in printf? How do I put a % sign in a printf, ie printf("\n %: %.2lf",someVar); The first % seems to do nothing. MS Tag: rookie's question about using clipboard Tag: 213872
  - 14
    - Class Array Initialization I have a class that I need to have an CString and doubles, but I am not getting the desired effect... i.e., I think that the class member arrays are not being initialized, only arrays local to the constructor. I need to perform lookups, i.e. CNecTblImpedence tbl; x=4; tbl.dXSteel[4] + tbl.dRSteel[x] ; etc.. I thought arrays would be easy enough... what am I doing wrong? I want the in the CNecTblImpedence class, as I may be adding some member functions later. class CNecTblImpedence { public: CNecTblImpedence(); virtual ~CNecTblImpedence(); static CString strSize[21]; static double dXSteel[21]; static double dRSteel[21]; }; CNecTblImpedence::CNecTblImpedence() { // data from NEC 2002 Table 9 // dRSteel and dXSteel are in Ohms/1000' CString strSize[]={"14","12","10","8","6","4","3","2","1","1/0","2/0","3/0","4/0","2 50","300","350","400","500","600","750","1000"}; double dXSteel[]={0.073,0.068,0.063,0.065,0.064,0.060,0.059,0.057,0.057,0.055,0.054 ,0.052,0.051,0.052,0.051,0.050,0.049,0.048,0.048,0.048,0.046}; double dRSteel[]={3.1,2.0,1.2,0.78,0.49,0.31,0.25,0.20,0.16,0.12,0.10,0.079,0.063,0 .054,0.045,0.039,0.035,0.029,0.025,0.021,0.018}; } Tag: rookie's question about using clipboard Tag: 213866
  - 15
    - threads & critical sections I understand what a critical section is supposed to do, however I was wondering if someone could elaborate: Say we develop a list class (typical doubly-linked list) and as a member we def a flag of type bool. When the Add, Insert, or Remove functions of that list are called, they wait for the flag to turn off: list::add (T* value) { while (listlocked); // wait if set listlocked=true; [Add my node] listlocked=false; } I'm sure because I'm just now introducing myself to threading, I'm missing a big chunk of the issue that is perhaps masquerading in the unknown caves of Windows- but is this essentially what is going on? I only ask because MSDN constantly refers to "memory allocation" when processing critical sections and mutexes. TIA Tag: rookie's question about using clipboard Tag: 213848
  - 16
    - will "variable;" always be optimised to nothing Hi, I am curious about the following code void fn(int a) { a; } will the line 'a;' be optimised to nothing? I assume it will but I'd like to be sure. The reason for doing this is to avoid the Level 4 warning about unreferenced arguments obviously the other alternative is to go void fn(int) { } but I have seen the first version used and am curious as to whether it has any overhead Vin Tag: rookie's question about using clipboard Tag: 213846
  - 17
    - Error I am running a Multithreaded VC application and some times I am getting the error in my application when it runs on the production server. "The instruction ********** referenced memory at "***********". The memory could not be read. Click OK to terminate the program. Click on CANCEL to debug the program. But when I test the same on other machines I am unable replicate . As it is production server I am unable to Debug in that system. Both systems have same configurations (windows XP professional, 2002 version, service pack1) Can someone let me know what are all the general circumstances which can lead to this type of errors from application point of view and O/S point of view. TIA, Gary Tag: rookie's question about using clipboard Tag: 213835
  - 18
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I was reading Charles Petzold's "Programming Windows" book.
In the Clipboard chapter, the author says that
every "OpenClipboard()" function call should be followed
by a "CloseClipboard()". But in the Blowup.c example
(Figure 14-21), there isn't a CloseClipboard() call after
OpenClipboard(). (page 719, under "case IDM_EDIT_COPY")
And the program runs fine.
So should OpenClipboard() and CloseClipboard() always come
in pairs or not?
Thanks!

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Re: rookie's question about using clipboard by Stephen

Stephen
Fri Aug 15 10:19:04 CDT 2003

cure wrote:

> I was reading Charles Petzold's "Programming Windows" book.
> In the Clipboard chapter, the author says that
> every "OpenClipboard()" function call should be followed
> by a "CloseClipboard()". But in the Blowup.c example
> (Figure 14-21), there isn't a CloseClipboard() call after
> OpenClipboard(). (page 719, under "case IDM_EDIT_COPY")
> And the program runs fine.
> So should OpenClipboard() and CloseClipboard() always come
> in pairs or not?
> Thanks!

Does the sample code call CloseClipboard() at all? If not, the book is
probably wrong then. (I too have that book - 5th edition - but I don't
remember reading about the clipboard stuff in it - nor do I have it at hand
at the moment so I can't look for myself)

An application should call the CloseClipboard() function after every
successful call to OpenClipboard().

So yes, they probably should come "in pairs", as you put it. Better to be
safe than sorry! :-)

Regards,

Stephen.

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