howto determine memory leaks for _bstr_t and BSTR

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  - 1
    - KeyboardProc Scancode - Changing to Virtual Code Hi, I'm creating a DLL that creates a system wide keyboard hook. I need to know how I can change the scancode retrieved in the KeyboardProc to a virtual code. I know this can be done using the TranslateMessage, however I do not have a window to handle the message loop. Is there some API that changes a scancode (or keyboard input message) to the virtual character code? Josh Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250642
  - 2
    - Incrementing a pointer to a one-past-the-end value? I wonder if the C++ standard says what should happen if I increment a pointer to a one-past-the-end value. I think it says that it is perfectly legal to increment a pointer to the last element element in an array - I get a pointer to one-past-the-end value. It is guaranteed that such a value exists for any array, so I always get a valid pointer to something (I do not care what it is). So, my question is what if I go further and increment a pointer to a one-past-the-end value? Do I still get a valid pointer to anything? Let me illustrate my question with a piece of code: int main ( ) { int a[ 2 ]; int* p = a; ++p; // OK, points to the second element (indexed 1). ++p; // OK, points to one-past-the-end value. ++p; // What happens here? Is p a valid pointer? And what if the array was allocated dynamically? } -- Angel Tsankov fn42551@fmi.uni-sofia.bg Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250634
  - 3
    - Timing function calls I would like time a function call in milli seconds. What is the best way to implement? FYI: the function call a RPC to a distributed object. Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250631
  - 4
    - Where did my warnings go? Hello! I am using Visual C++ 6.0 for a major project which contains a lot of conversions between float and int, as well as comparisons between signed and unsigned integer types. The warning level is set to 3, so I should get many C4244 and C4245 warnings when compiling the code, but I never did. Then I used the STLport to compile my project and I was suddenly faced with hundreds of warnings, many of them where C4244 and C4245. I spent hours entering type casts into my code, so that those warnings would disappear. I thought that my compiler somehow "woke up" and gave me the warnings it should have given me years ago... But when I switched back to Microsoft's implementation of the STL, the warnings disappeared again. I found out that the STLport uses pragmas to influence the compiler's behaviour for warnings, apparently activating them. However, the default behaviour is to *issue* these warnings, not to suppress them - so there must be some corresponding pragmas in the Windows header files, too. I do want these warnings, so my current workaround is a #pragma warning( default : 4244 4245 ) after including any Windows header files. It does not work when I put this pragma *before* those include statements, which encourages me in thinking that Microsoft's header files are messing around with the compilers warning behaviour. Does anyone happen to know whether there is a macro that must be defined for the project in order to get the default behaviour? I see no point in setting the warning level to 3 in order to get warnings and then let those Windows headers spoil everything. To me, these headers are broken - does anyone know how it is with later versions? -- Matthias Hofmann Anvil-Soft, CEO http://www.anvil-soft.com - The Creators of Klomanager http://www.anvil-soft.de - Die Macher des Klomanagers Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250630
  - 5
    - Callback Function in C DLL to VB EXE Hi, I've created a C DLL that is being used by a VB EXE. The VB code passes the addressof a function to the C DLL. The C DLL later on calls the function in the VB Code; If the function has no parameters it works, however when I change the function to add a parameter the following debug error is thrown: "The value of ESP was not properly saved across a function call..." My code is as follows: C DLL: static void (* TestEvent)(bool c); //setting the callback function EXPORT BOOL __stdcall SetCallBack(void (* __stdcall TestCallBack)(bool c)) { TestEvent = TestCallBack; //testing the callback TestEvent(true); } VB CODE: 'in a form public sub Form_Load() SetCallBack(AddressOf TestCB) end sub 'In a public module Public Declare Function SetCallBack Lib "Test.dll" (ByVal CallBack As Long) As Boolean Public Sub TestCB(ByVal c As Boolean) Debug.Print "gotcha" End Sub Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250628
  - 6
    - Assigning apartment to a COM component Hi, I have the following problem: I am getting two independent COM components (say A and B) assigned a single STA. One of the components (say A) calls a method on a third component C (in a different STA) that may in turn possibly go out-of-proc from C. Now as soon as this call goes out-of-proc, a call on component B, which was waiting outside the apartment all this time (as calls to STA are serialized by COM), suddenly enters the STA and starts processing. Now, when the out-of-proc call returns to C and then eventually back to A, it has nowhere to return, as the thread is already in use by B! I thought if A and B always belong to different STAs of their own, this problem will not occur. In that regard, is there any way which can ensure that a COM component with threadingmodel=Apartment (STA), after it is CoCreated, will always lie in a different new STA, and not join any other already existing STA? Also, do you see any other possible solutions to this problem? Thanks in advance, Regards, Sandeep Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250625
  - 7
    - How to get the physical device name of dynamic volume in dynamic disk? As we know, the Windows API QueryDosDevice() can get the physical device name of a partition or volume in a basic disk. But it doesn't work if the volume is a dynamic volume in a dynamic disk.(Actually, the API will return a fake name.) For example, there are 2 disks in my computer, one is a basic disk and another is a dynamic disk. The basic disk has 2 volumes, with drive letter C: and D:, and the dynamic disk also has 2 volumes (dynamic volumes), with drive letter E: and F:. Get the physical device names of those volumes by API QueryDosDevice(): C: - \Device\HarddiskVolume1 D: - \Device\HarddiskVolume2 E: - \Device\HarddiskDmVolumes\MybondDg0\Volume1 F: - \Device\HarddiskDmVolumes\MybondDg0\Volume2 (Note: the string "mybond" is the specified personal name when i installed the OS, which is Windows 2000 Professional with SP4.) Then, I use a filter driver, which is built on sfilter in Windows IFS Kit, to catch the IRP_MJ_CREATE IRPs when accessing those volumes, and get those volumes's physical device names like following: C: - \Device\HarddiskVolume1 D: - \Device\HarddiskVolume2 E: - \Device\HarddiskDmVolumes\PhysicalDmVolumes\BlockVolume1 F: - \Device\HarddiskDmVolumes\PhysicalDmVolumes\BlockVolume2 Comparing the above two different names, we can find out that QueryDosDevice() couldn't get the true physical device name of a dynamic volume. So, how can I get the true name like: \Device\HarddiskDmVolumes\PhysicalDmVolumes\BlockVolume1 not \Device\HarddiskDmVolumes\MybondDg0\Volume1? Thank you so much! -- Regards Mike Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250614
  - 8
    - Using C DLL in VB Hi, I've created a C DLL and want to use it in vb. I've tried several functions and they work well however when a function requires a parameter I receive the following error: "Bad DLL Calling Convention" Could anyone help me? Here is the code: C DLL: #ifdef __cplusplus #define EXPORT extern "C" __declspec (dllexport) #else #define EXPORT __declspec (dllexport) #endif EXPORT long Test (long i) { return 10; } VB EXE: Public Declare Function Test Lib "Test.dll" (ByRef i As Long) As Long public sub form_load() Test 1 end sub Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250608
  - 9
    - problems with callback function I'm trying to write a callback function, I've done it before, but this time I seem to be having problems... I define the following... typedef int (* ENUMINTERFACE)(char* szIP); void enumInterfaces(ENUMINTERFACE pFn); int InterfaceEnumProc(char* szIP); then at some point in my code I call enumInterfaces(InterfaceEnumProc); I get the compilation error 'cannot convert parameter 1 from int(char*) to int(_cdecl*)(char*) whats the correct form for declaring callbacks. Mark Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250599
  - 10
    - yet another GetProcAddress() problem Trying to get the address of a test method and I'm getting NULL. I have created a map file and everything looks correct: <snip> Exports ordinal name 1 ?GetNumber@@YAHXZ (int __cdecl GetNumber(void)) </snip> In the host DLL, I'm importing with this code: <snip> typedef int (CALLBACK* LPFNDLLFUNC1)(void); HINSTANCE hDLL; // Handle to DLL LPFNDLLFUNC1 lpfnDllFunc1; // Function pointer hDLL = LoadLibrary("Z:\\M3\\Code\\MAX_Plugins\\InFluFluIO\\Debug\\InFluFluIO.dll"); if (hDLL != NULL){ lpfnDllFunc1 = (LPFNDLLFUNC1)GetProcAddress(hDLL, "GetNumber"); if (!lpfnDllFunc1){ // handle the error ::MessageBox(0, "Failed loading InFluFluIO dll", "some tools may not work correctly", MB_OK|MB_ICONWARNING); FreeLibrary(hDLL); return -1; } else{ // call the function result = lpfnDllFunc1(); FreeLibrary(hDLL); } } </snip> Even though the map file shows me the name, I have tried adding the "_" before the name. I get NULL everytime. Anyone have any ideas? Any help appreciated, Steve Klett Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250590
  - 11
    - Virtual Base Class Question Hi all, I have the following code and am a little surprised that VC.NET 2003 won't compile it: class A { public: A(char *) { } }; class B : virtual public A { }; class C : virtual public A { }; class D : public B, C { public: D(char *s) : A(s) { } }; int _tmain(int argc, char* argv[]) { D cD("hello world"); return(0); } My understanding was that in the case where a virtual base class has only a specific constructor defined (in this case, taking a char *), that it was the most derived class's responsibility to call that constructor because no default exists. Have I misunderstood??? I am getting two errors when the cD declaration is compiled: error C2512: 'B' : no appropriate default constructor available error C2512: 'C' : no appropriate default constructor available How should I code this so that I have a single instance of A which is a base to both B and C which are bases to D??? Thanks for your help, Loz. Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250578
  - 12
    - Convert short to float I would like to convert a short value to float. Is the following style correct? If not, what is the correct way? ///////////// short value = 123; float a_float_value = (float) short_value; ///////////// Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250564
  - 13
    - While loop style I've a while loop as below, and would like to execute the true expression until false. Is my style of ";" correct? FYI: queue.remove() returns true if element is removed, false if queue is empty. Note, the queue do not provide a isEmpty funtion. //////////// while ( queue.remove() ) { ; } //////////// Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250563
  - 14
    - Serial port with non standard baudrates Hi, I need to use Serial port with non standard baudrates, is it possible ? Thanks, Behzad Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250506
  - 15
    - what is .net? Hello, I did c++ for several years and I am writing my codes using MFC. I recently get MSVC 2003 with .net What can I do with it? What is it (.net) offering to me as a C++ programmer? Where is the best place to start (any online tutorial)? I don't want to move to C# or VB.Net. I think it is a waste of money if I continue to program with MFC when the .net framework is available, Am I right? Best regards Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250505
  - 16
    - Exporting DLLs written in VC++ to VB. Hai, I have written the calling convensions in VC++ like this : unsigned short int _stdcall funcname(int x,int y) { ..... and I have created a def file like this : LIBRARY TESTLIB EXPORTS funcname @1 But this works well when the program is invoked from within the VBIDE. But fails when I create an EXE file. Please help me. Thanks in advance. Kiran Kumar Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250501
  - 17
    - Converting local times to UTC I have seen a lot of examples of converting UTC into local time, but none for the other way around. I have written a log file converter that needs to convert between 2 different formats. The first file format has its times specified as local time, and the second has times specified as UTC. As yet, I have the date/time as a DATE, a SYSTEMTIME, a time_t and a struct tm, the contents of all of them are specified in local time. None of these formats seem to have a field or way of specifiying a time zone in them. I thought I could simply use the gmtime(time_t) function to perform the conversion. But it just gave out the same number as I gave in, so I am not sure what the point is. Then I read about the _tzset() function that prepares the time zone variables for the converter functions. However calling this function (before calling gmtime) has no effect. It appears from the gmtime documentation, that this function always assumes the input is in UTC which seems strange to me, as thats what its output is supposed to be. So I am looking for a conversion function that converts from local time to UTC. Any ideas? Thanks. Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250500
  - 18
    - Novice question - Pointers in a function Hi folks, I have seen some example code which is structured as follows. There is a function declared in a header file and defined in a cpp file. For simplicity I will call this function myFunc(). In the cpp file it is defined as follows (note, I have made it simpler for clarity) - void myFunc(int myInt, double *input, double *output) { // Perform some computation.... // // Finally output = some_value; } Now, in a seperate cpp file I use this function so I include the header file for the above function myFunc(). In the cpp file where I use the function I use it as follows - double fIn, fOut; double result; fIn = some_value; myFunc(1, fIn, fOut) result = fOut; The bit that is confusing me is the last bit i.e. result = fOut; I noticed that where myFunc() is defined it does not return any values, so I am wondering how can result 'get the value of' fOut? I realise it must be something to do with the fact that myFunc() takes fOut as a pointer, but I'm not sure about the exact underlying mechanism that causes this to happen? Generally speaking, am I right to think that by passing fOut into the function where it is accepted as a pointer, causes fOut to get set to the same value as 'output' in myFunc() Thanks for any help with this! Cheers, David Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250490
  - 19
    - Scope of using namespace Hi, The following code compiles with no error on VC7.1, however I am told that it produces an error in GCC 4.0 and that, according to the standard it should indeed produce an error that C1 is not accessable from foo(). Could someone with access to VC8.0 check out what the behaviour on this compiler is? namespace N1 { class C1 { public: void f1() {} }; } namespace N2 { using namespace N1; class C2 { C1 c; void f2(); }; } void N2::C2::f2() { C1 c; c.f1(); } void foo() { C1 c; c.f1(); } Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250485
  - 20
    - Exporting DLLs to Visual Basic Hai, I have written a DLL in VC++ and accessing it in VB. It works fine when the program runs within VB-IDE. But, when I created an EXE, it didn't work. What might be the problem. Please help me in this. Thanks in advance. Kiran Kumar Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250484
  - 21
    - Workaround for an INTERNAL COMPILER ERROR wanted... Does anybody know a workaround so that the following code compiles with VC++ 2003? template< typename t, t v, template< t > class c > struct s { static t r( ) { return c< v >::r; } }; template< typename t > struct c { template< t v > struct s2 { static t const r = v; }; }; int main ( ) { s< int, 1, c< int >::s2 >::r( ); } Btw, a standard-compliant compiler shoud compile this code, shoudn't it? Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250479
  - 22
    - cast array to structure template<typename type> class CData { public: DWORD a; DWORD b; DWORD c; type* m_Data() { return (type*)(this + 1); } }; Note: Used old school cast to make my code more readable. DWORD Data[] = { 0, 0, 0, 0 }; CData<type>* nulldata = (CData<type>*)&data; type *wti = (type*)(((BYTE*)&data) + sizeof(CData<type>)); Are these cast safe? class CData { public: DWORD a; DWORD b; BYTE* m_Data() { return (BYTE*)(this + 1); } } DWORD Data[] = { 0, 0, 0 }; CData* nulldata = (CData*)&data; Do I avoid structure padding if I do this? Is structure padding even a issue? Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250454
  - 23
    - Class templates and friend function templates I have a class template like this: template< typename t > class c; I'd also like to have an operator == for objects of types, which are different specializations of c: template< typename t1, typename t2 > bool operator == ( s< t1 > const& , s< t2 > const& ); In order to implement this operator, I need it to be a friend of both s< t1 > and s< t2 >. For the sake of safety, I'd like no other specialization of c to have this operator as its friend. Is this possible and, if so, how? Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250428
  - 24
    - how can i modify the ip address ,mask,default gateway in VC? is there any function? Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250404
  - 25
    - How to set a backgroundcolor for a windows control (Trackbar) ? Hello, i know this is a noob question, but i haven't any idea how to change the backgroundcolor for a trackbar, so i try a question here. I have the following code snippets inside a DLL, the problem is this XXXX in the subclass, it do nothing, i have try FillRect with a solidbrush or other things, no luck :( any ideas? whats wrong? =========================================== WNDPROC oldSliderWindowProc; LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) { case WM_CREATE: { ... hwndSlider = CreateWindow(TRACKBAR_CLASS,"",WS_CHILD | WS_VISIBLE | TBS_NOTICKS,1,1,120,20,hwnd,(HMENU)0, (HINSTANCE) GetWindowLong(hwnd, GWL_HINSTANCE), NULL); SendMessage(hwndSlider, TBM_SETRANGE, FALSE, MAKELONG(SLIDER_MIN, SLIDER_MAX/SLIDER_DIV)); SendMessage(hwndSlider, TBM_SETPOS, TRUE, DBGetContactSettingDword(NULL,SERVICENAME,"Volume",1000)/SLIDER_DIV); oldSliderWindowProc = (WNDPROC)SetWindowLong(hwndSlider, GWL_WNDPROC, (LONG)SubclassedSliderWindowProc); ... } } LRESULT CALLBACK SubclassedSliderWindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) { switch(msg) { case WM_ERASEBKGND: XXX return TRUE; } return CallWindowProc(oldSliderWindowProc, hwnd, msg, wParam, lParam); } -- Newsreader: http://mesnews.net/index-gb.php Deutsche Hilfedatei: http://www.lastwebpage.de/download/mesnews-de.zip Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250403
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  - 1
    - load a PNG image Hi, how could i load a PNG image file in VC++ ? is it possible using only Win32 functions or should i use MFC ? thanks a lot, Maileen Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250370
  - 2
    - skinnable application Hi, I would like to know what is the best technique for creating skinnable application ? everything should be imagess if i understood well, and 1 file should contain all information about these images like names, status (pressed, hover, standard, up, and so on...). But should i write in this file, the dimensions of each image ? does anyone have some samples please ? thanks a lot, Maileen Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250369
  - 3
    - how to Call VB dlll in VC Could anybody point me to some resource about how to call a VB.net DLL in VC.net? Thanks in advance. Al Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250368
  - 4
    - Theme issue in VC++. Hi All, I have created the application like TurboNote+. The application should run on both Win2K and WinXP. While running the application in XP, i got some border issues. It will be fixed, if we choose the default theme in WinXP. But my application should run on all themes of WinXP. How can i handle themes issues in VC++. Please help me to solve this problem. Regards, Prakash. Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250365
  - 5
    - =?Utf-8?Q?Funny_linker_error=E2=80=A6!?= I have a class that I'm using in my solution. This is an Internet solution, and this class is something I share with couple of projects. Now, to avoid redefining the class, I included the header in both projects. In order to relieve my self from recompiling, I let the server (project 1) compile this file, and I added the client (project 2) the object file. Now here is the funny thingâ?¦ I have a clean constructor to this class (no parameters) which is called without a problem from the object file. Any method declared works very well, BUT the ones that has wchar_t * as parameters. Any function that have any parameter like this will result in a linker error " chat client error LNK2019: unresolved external symbol "public: int __thiscall CUserLoginInfo::SetLoginData(wchar_t *)" (?SetLoginData@CUserLoginInfo@@QAEHPA_W@Z) referenced in function "public: void __thiscall CchatclientDlg::OnBnClickedOk(void)" (?OnBnClickedOk@CchatclientDlg@@QAEXXZ) " no matter what the function is, as long it contains this parameter, I will get this error. If I won't call this function the project will obviously runâ?¦ needles to say that this can be resolved very quickly by copying the values by hand, but this is a flowed programming style, not to mention extremely annoying!... wchar_t is, of course, defined in both projects (/Zc:wchar_t). I had tried to fiddle with some functions parameters, all passed but thisâ?¦ What do you think? Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250364
  - 6
    - image JPEG and BMP Hi, i've created a JPEG image which is 300 x 50. this image contains 6 images of 50 x 50. i would like to know how can i tell to my program to use image 1 (from pixel 0 to 49) at one place and to tell again to use image 3 (from pixel 99 to 149) to another place ? or does it work only with BMP image ? how to do it without using MFC ? thanks a lot, Maileen Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250363
  - 7
    - Conversion operator not callable? I get an error message when I try to compile the code below: ======================== Error message ======================================== error C2664: 'f' : cannot convert parameter 1 from 'c<t1,t2>' to 'const c<t1,t2> &' with [ t1=char, t2=int ] and [ t1=const char, t2=int ] ===================================== Code ==================================== template< typename t1, typename t2 > struct c { c( ) { } operator c< t1 const, t2 >( ) const { return c< t1 const, t2 >( ); } }; template< typename t2 > void f( c< char const, t2 > const& ) { } int __cdecl main ( ) { c< char, int > C; f( C ); } Why is the conversion operator not used in this context? Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250357
  - 8
    - Dll Entry Point Name Hi, MSDN documentation states: "The name DllMain is a placeholder for a user-defined function. You must specify the actual name you use when you build your DLL." How do you actually accomplish that? I have not been able to find that in the VC.Net documantation. Many thanks, Aaron Fude Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250350
  - 9
    - Enabling Memory Leak Detection Hi, I am trying to enable memory leak detection based on the url below. If I use _CRTDBG_MAP_ALLOC instead of CRTDBG_MAP_ALLOC in a test program, I can see the offending line numbers and source file get printed out. However in the program that I am trying to find memory leaks, I get the same debug output regardless of whether I #define _CRTDBG_MAP_ALLOC or CRTDBG_MAP_ALLOC. And I only get one line number <dllmodul.cpp(106)> output instead of every offending (leak causing) line number. Why is that? // based on http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vsdebug/html/vxconenablingmemoryleakdetection.asp #define _CRTDBG_MAP_ALLOC #include <stdlib.h> #include <crtdbg.h> . . . _CrtDumpMemoryLeaks(); OUTPUT Detected memory leaks! Dumping objects -> {61} normal block at 0x00872680, 7 bytes long. Data: <MyExename> 43 61 70 47 65 6E 00 {56} normal block at 0x00872748, 33 bytes long. Data: < C > 00 43 00 CD CD CD CD CD CD CD CD CD CD CD CD CD {55} normal block at 0x008726E0, 40 bytes long. Data: < |L > 14 7C 4C 10 16 00 00 00 00 00 00 00 00 00 00 00 dllmodul.cpp(106) : {53} client block at 0x00872590, subtype 0, 64 bytes long. a CDynLinkLibrary object at $00872590, 64 bytes long {52} client block at 0x00872508, subtype 0, 64 bytes long. a CDynLinkLibrary object at $00872508, 64 bytes long {50} client block at 0x00874F68, subtype 0, 64 bytes long. a CDynLinkLibrary object at $00874F68, 64 bytes long Object dump complete. Thanks! Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250349
  - 10
    - Client Server using TCP/IP - which interface to use? Hi there... I want to write a small utility. It should be front- and backend running on different machines. I don't want to handle error correction or timeouts by myself. Communication is TCP/IP. How could I easyly do the communication? CSocket or something else. Thanks in advance Stefan Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250346
  - 11
    - GetDIBits is returning 0 hi, i'm geting de bits of to bitmaps into a buffer in order to compare then. the first time i call GetDIBits, it works ok, and returns the number of scanlines an correct data in the buffer. the second time, it returns 0 and does nothing in the baffer. if i change the order of the calls, the second still fails. i know that then bitmaps must not be selected on any DC, and i'm carefully with that. ¿¿any reason why GetDIBits returns 0?? Thank you. by MJM. Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250338
  - 12
    - reversing bit order Hi folks - I'm writing some code for a checksum algorithm and I need to reverse the order of bits in an unsigned char array, in 4-bit chunks (half byte, or nibble). Example.. the array contains BYTE data: 0001 0110, 0000 0010, 1000 0000 0x16, 0x02, 0x80 Each nibble gets reversed: 1000 0110, 0000 0100, 0001 0000 0x86, 0x04, 0x10 Each nibble will then be added and the results become a checksum nibble. I can do this brute force, one bit at a time, but I'm hoping someone out there will recognize a possible elegant solution. There will always be 5 bytes (40 bits, 10 nibbles) to deal with. Any ideas? Thanks. Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250334
  - 13
    - Tree control: How do I get the expand / collapse icons? I'm performing a custom draw of the items of a tree control and I need to be able to draw the expand and collapse toggle button ([+] & [-]) that appears to the left of items with children. I need to know how to get that icon, and the coordinates that the OS expects the symbol to be drawn. I can't find this information in the MSDN. Thanks (Sorry that this is the wrong category but there isn't a vc.controls newsgroup) Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250331
  - 14
    - Initializing member variables Hi, I did this test using VC .NET 7.0: #include <iostream> using namespace std; class A { public: //A () { } // Providing a default constructor makes it work int i; int GetI() { return i; } }; int main(int argc, char* argv[]) { A a; //cout << a.GetI() << endl; //This call works cout << a.i << endl; //Throws Runtime error a.i++; //Throws Runtime Error return 0; } In the lines mentioned, it throws a runtime error saying that the variable is not 'defined'. The variable is not initialized, of course, but what makes it not throw the error if: 1) the default constructor is provided, which does not actually initialize 'i'? 2) a.GetI() is called, again without initializing 'i'? TIA, SD Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250327
  - 15
    - Using WebBrowser Control, how to Navigate w/o displaying the HTML page. I built an MFC project of the SDI type, hosting a WebBrowser Control. Everything seems to behave properly. I am using the Navigate(LPCTSTR URL) to get web pages. Is it possible and if so how to perform all the functionality of the Navigate() w/o display the page? There is a method called SetVisible(false/true) but when trying to use it, it creates an exception. With and w/o regard to the above question, Is it preferred to have a host of the MDI (or top level MDI) type, as to separate between the host's GUI window and the window in which the WebBrowser Control displays a page (that is if I allow it to do that)? Thanks, David Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250301
  - 16
    - std::_MAX Replacement I'm migrating from VS6.0 to VS 2003 .Net. One of the breaking changes is that _MAX has been redefined so that std::_MAX will no longer compile. I tried changing each usage to std::max, but that won't compile either. So I went using std::max ... float a = max(b, c); which is compiling. How have other people dealt with this issue? Thanks in advance! Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250291
  - 17
    - Calling vb.net web service from visual c++ Hi. I am new to this so this may be a dumb question: I am trying to call a web service that is Written in VB.NET from my C++ dll. here is what I did: 1. Create a sample web service (with helloworld function) 2. Create an empty ATL application (it compiled) 3. Added a reference to the wsdl document of the web service to the project. 4. tried to compile it and got an error: syntax error : expecting a type specification near "HelloWorldResult" error points to this line: [id(4), helpstring("method HelloWorld")] HRESULT HelloWorld([out, retval] HelloWorldResult *); Here is the code that was generated by Soap Tool Kit when I added a reference: // TestSoapTool.idl : IDL source for TestSoapTool.dll // // This file will be processed by the MIDL tool to // produce the type library (TestSoapTool.tlb) and marshalling code. import "oaidl.idl"; import "ocidl.idl"; [ object, uuid(433144B5-225D-42D8-8E2C-875467ABE7FA), dual, helpstring("IService1SoapProxy Interface"), pointer_default(unique) ] interface IService1SoapProxy : IDispatch { [propget, id(1), helpstring("property URL")] HRESULT URL([out, retval] BSTR *pVal); [propput, id(1), helpstring("property URL")] HRESULT URL([in] BSTR newVal); [propget, id(2), helpstring("property ProxyServerAddress")] HRESULT ProxyServerAddress([out, retval] BSTR *pVal); [propput, id(2), helpstring("property ProxyServerAddress")] HRESULT ProxyServerAddress([in] BSTR newVal); [propget, id(3), helpstring("property ProxyServerPort")] HRESULT ProxyServerPort([out, retval] BSTR *pVal); [propput, id(3), helpstring("property ProxyServerPort")] HRESULT ProxyServerPort([in] BSTR newVal); [id(4), helpstring("method HelloWorld")] HRESULT HelloWorld([out, retval] HelloWorldResult *); }; [ uuid(A07EF164-8E81-41FF-9D91-BD74F3C1F67E), version(1.0), helpstring("TestSoapTool 1.0 Type Library") ] library TESTSOAPTOOLLib { importlib("stdole32.tlb"); importlib("stdole2.tlb"); [ uuid(C7AC7808-58F3-4109-B2D9-ACC22521C055), helpstring("Service1SoapProxy Class") ] coclass Service1SoapProxy { [default] interface IService1SoapProxy; }; }; Before I go any further I wanted to know if it is even doable: calling vb-based functions from c++ since all types are different. Is this a common issue? Did I do anything wrong in my steps or is there anything I did not do? Thanks for the help. Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250284
  - 18
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  - 19
    - VC++ 6.0 or higher This is a multi-part message in MIME format. ------=_NextPart_000_000D_01C58D71.02386B80 Content-Type: text/plain; charset="koi8-r" Content-Transfer-Encoding: quoted-printable What is newest environment to build C++ applications? Microsoft VS 6.0 or something better? -- Thank you Vadim S. ------=_NextPart_000_000D_01C58D71.02386B80 Content-Type: text/html; charset="koi8-r" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; charset=3Dkoi8-r"> <META content=3D"MSHTML 6.00.2600.0" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2>What is newest environment to build C++ = applications?</FONT></DIV> <DIV>Microsoft VS 6.0 or something better?</DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2>--</FONT></DIV> <DIV>Thank you</DIV> <DIV>Vadim S.</DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV></BODY></HTML> ------=_NextPart_000_000D_01C58D71.02386B80-- Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250278
  - 20
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  - 21
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  - 22
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  - 23
    - J-Integra for COM (Java COM interoperability) Looking for Java/COM interoperability tools? Thousands of companies world-wide are using J-Integra for COM for interoperability between Java and Microsoft COM applications. J-Integra for COM is a pure Java implementation of the DCOM protocol, making it several times faster than Web Services. J-Integra for COM Features: * Access J2EE components from VB, C++, ASPs, etc... * Access COM components from EJBs, Servlets, JSPs, Applets, etc... * Pure Java implementation, 100% managed code (no native code required) * Bi-directional: "Java to COM" and "COM to Java" * One-sided deployment (no touch on Microsoft client/server side) * Supports any JVM running on any platform (Windows, Unix, Linux, etc...) * Optional high-speed native mode for Windows platforms * Allows Java clients to subscribe to COM events using standard Java semantics, and COM clients to subscribe to Java events using standard COM semantics * Supports both early binding and late binding access to Java/COM components * Supports the full range of COM Oleautomation types For a free evaluation, visit our website at http://j-integra.intrinsyc.com/ Regards, Shane Sauer Intrinsyc Software International, Inc. J-Integra Interoperability Solutions http://j-integra.intrinsyc.com/ When Web Services are not enough Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250268
  - 24
    - IDL Help Newbie question: What is the syntax to declare a string constant in an IDL? I'm trying to compile a type lib that I can reference and use from VB project. If I use 'string', I get an error: "syntax error : expecting a type specification or a storage specifer or a type qualifier near "string" If I use 'BSTR', I get an error: error C2440: 'initializing' : cannot convert from 'char [24]' to 'unsigned short *const ' If I use 'wchar_t *' I can compile it, but obviously I cannot use it in VB. TIA. Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250264
  - 25
    - mscorlib help I am using VC++ and am doing something where I need this: #using <mscorlib.dll>, however, I am told at compile time that I need to compile with /clr. When I used /clr I was told that I cannot use it with /RTC. I can modify /RTC but cannot seem to get rid of it. How can I resolve this problem? Tag: howto determine memory leaks for _bstr_t and BSTR Tag: 250263

I tried to use the crtheap debugging routines to check for memory leaks
caused by BSTR and _bstr_t string. From what I see in a test app
strings that are not deallocated are not reported using
_CrtMemDumpAllObjectsSince(). How can I check for unallocated BSTRs and
VARIANTS?

Thanks

john

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Re: howto determine memory leaks for _bstr_t and BSTR by Rodrigo

Rodrigo
Wed Jul 27 08:21:17 CDT 2005

http://comcorba.tripod.com/comleaks.htm
http://support.microsoft.com/default.aspx?scid=kb;en-us;139071

--
Un saludo
Rodrigo Corral González [MVP]

FAQ de microsoft.public.es.vc++
http://rcorral.mvps.org

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Re: howto determine memory leaks for _bstr_t and BSTR by Sergei

Sergei
Wed Jul 27 08:26:01 CDT 2005

<tendengarci@yahoo.com> wrote:
> I tried to use the crtheap debugging routines to check for memory leaks
> caused by BSTR and _bstr_t string. From what I see in a test app
> strings that are not deallocated are not reported using
> _CrtMemDumpAllObjectsSince(). How can I check for unallocated BSTRs and
> VARIANTS?

ftp://ftp.microsoft.com/PSS/Tools/Developer%20Support%20Tools/LeakDiag/

Sergei

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