C#

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How can I compare doubles? xkx3220-Jul-06 21:28 xkx32 20-Jul-06 21:28  hello can you tell me how can I compare two double vars in my app i tried: if (var.Equals(.4)) but it's not working... and i am sure the two var contains the same value (i used MessageBox to print the vals) please help me Re: How can I compare doubles? Nader Elshehabi20-Jul-06 22:10 Nader Elshehabi 20-Jul-06 22:10  Hello the Equals() method is usually used to compare two reference types -Yet it still can compare value types-. Instead you should take a shorter approach in comparing two value types by using the == operator double A = 5.4; double B = 2.3; if (A == B) { //Do something } else if(A == 2.7) { //Do somthing } Regards Re: How can I compare doubles? Andrei Ungureanu20-Jul-06 22:42 Andrei Ungureanu 20-Jul-06 22:42  hy, have you tried to compare something like: double a; double b; if (a <= b) { } if (a >= b) { } it works just fine with double as with integers. Do your best to be the best Re: How can I compare doubles? Shajeel21-Jul-06 0:35 Shajeel 21-Jul-06 0:35  may be a better way to compare double will be if(Math.Abs(var-0.4) < 1e-14) Regards Shajeel Re: How can I compare doubles? Super Lloyd21-Jul-06 0:44 Super Lloyd 21-Jul-06 0:44  You better use decimal instead of double in such circumstances. How to get a DataTable from StoreProcedure? Old Gun20-Jul-06 20:58 Old Gun 20-Jul-06 20:58  My Oracle SoreProcedue return a table.How Can I get it from c#? HowTo Print A Grid In A Window Application Vipin Venugopal20-Jul-06 20:47 Vipin Venugopal 20-Jul-06 20:47  Hello Friends, Can anyone tell me how to print a datagrid in a window application using C#. Iam having a very big grid. first it should be shown to a printpreview page and from there it has to be printed. Help me to get the entire grid to a printpreview page. Vipin Re: HowTo Print A Grid In A Window Application Duncan Edwards Jones20-Jul-06 21:12 Duncan Edwards Jones 20-Jul-06 21:12  There is a VB.Net code snippet that does what you want to do here[^] - you should be able to convert it to C# (or compile it and import the compiled class) '--8<------------------------ Ex Datis: Duncan Jones Merrion Computing Ltd Re: HowTo Print A Grid In A Window Application Vipin Venugopal20-Jul-06 23:26 Vipin Venugopal 20-Jul-06 23:26  The article u gave worked.Thank u so much for the information. Vipin Re: HowTo Print A Grid In A Window Application Nader Elshehabi20-Jul-06 22:50 Nader Elshehabi 20-Jul-06 22:50  Hello Try this article ControlPrint[^] Regards C# .NET 1.1 Application displaying problem in Chinese Windows XP uz_jaswal20-Jul-06 20:43 uz_jaswal 20-Jul-06 20:43  hi all, i have a windows application built using C# .net 1.1, the application when installed on a pc running English Windows XP runs properly, but when it is installed on a system running Chinese Windows XP it is not displayed properly , the text boxes appear out of place, the images are out of place. Please if anyone knows what the problem could be let me know soon. Thank you. From, Usman Zaheer Jaswal. How can I create a var that doesn't get destroyed after exiting the method? xkx3220-Jul-06 20:03 xkx32 20-Jul-06 20:03  hi can you please tell me how can I create a local var that doesn't get destroyed after exiting the method? thanks Re: How can I create a var that doesn't get destroyed after exiting the method? Vega0220-Jul-06 20:19 Vega02 20-Jul-06 20:19  I'm a bit confused by your question, as objects become eligible for garbage collection when no references to them remain in the code. Could you provide specifics on what exactly you're trying to do? What kind of variable is this, and what do you plan on doing with it when the method returns? Re: How can I create a var that doesn't get destroyed after exiting the method? xkx3220-Jul-06 21:29 xkx32 20-Jul-06 21:29  I am wondering if it's possible to create a variable in a method as follow: string tttt = "Gggg"; and then after exiting the method i can still access that var Re: How can I create a var that doesn't get destroyed after exiting the method? [modified] Martin#20-Jul-06 21:36 Martin# 20-Jul-06 21:36  No, I think! But, somebody correct me please. -- modified at 3:38 Friday 21st July, 2006 Re: How can I create a var that doesn't get destroyed after exiting the method? Martin#20-Jul-06 20:33 Martin# 20-Jul-06 20:33  Hello, If I understand you right??? You have to declare your variable inside your Class and not in the Method. Or you have to store the Value external (Database or XML). Hope I helped you. All the best, Martin Re: How can I create a var that doesn't get destroyed after exiting the method? Nader Elshehabi20-Jul-06 22:33 Nader Elshehabi 20-Jul-06 22:33  Hello One of the main ideas of C# -if not the main- is being managed by the garbage collector. That's why they call it a managed code -while there is an unmanaged code-. This task is quite advanced and is concerned with memory locations. Even then you'd have to store the memory location -otherwise known as pointer- somewhere to access the value. You still can do something similar to that in C# with reference type only using WeakReference class. Revise it in your MSDN Yet again what's exactly your point? Sometimes something that's possible is not always the best solution for a matter!! I'm sure there is a better approach to solve your problem -if it's not a mere programming challenge of some sort- Regards C# to Excel aaraaayen20-Jul-06 19:56 aaraaayen 20-Jul-06 19:56  Hi friends, Please tell me while converting C# gridview to excel how to autofit the columns in excel. Please Help Me. Thanks & Regards Prya Re: C# to Excel WillemM20-Jul-06 20:58 WillemM 20-Jul-06 20:58  As far as I know, you can select all cells in the gridview and Ctrl+C, Ctrl+V them to Excel. So nothing special there WM. What about weapons of mass-construction? Re: C# to Excel Nader Elshehabi20-Jul-06 22:46 Nader Elshehabi 20-Jul-06 22:46  Hello aaraaayen wrote: how to autofit the columns in excel Do you want to do this in the code -ie programmatically- or just like WilliamM told you?? Besides, what does "autofitting" have to do with C# forum?!! Regards Re: C# to Excel aaraaayen20-Jul-06 23:49 aaraaayen 20-Jul-06 23:49  i need to do by programmatically. Prya Re: C# to Excel Nader Elshehabi21-Jul-06 3:26 Nader Elshehabi 21-Jul-06 3:26  Hello What do you mean by "autofit columns"? Do you mean resizing the width of the column to fit the content? You want to write an application to do this inside Excel??!! It's quite strange!!! Also another point. There are many ways to convert the data in a GridView to Exce format. What's your way in doing it? -If you think it's relevant to the issue at hand- I think I need more details on exactly what you are planning to do. Maybe I could assist you more. Regards Re: C# to Excel stancrm21-Jul-06 1:38 stancrm 21-Jul-06 1:38  Usually I'm using StreamWriter to write the data in CSV file and import it using Excel. I always use semicolon as delimiter. In C# ,How can i use a C++ DLL with a class being defined in head file. dfbx20-Jul-06 17:43 dfbx 20-Jul-06 17:43  i have a .h file like below. how can i use it in C#? //--------------------------------------------------------------- // AVEControl.h: interface for the AVEControl class. // ////////////////////////////////////////////////////////////////////// #if !defined(AFX_AVECONTROL_H__4E171B4B_A11B_49F1_B41C_5F4A31B5CF08__INCLUDED_) #define AFX_AVECONTROL_H__4E171B4B_A11B_49F1_B41C_5F4A31B5CF08__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 #ifdef DEVICECONTROL_EXPORTS #define DEVICECONTROL_API __declspec(dllexport) #else #define DEVICECONTROL_API __declspec(dllimport) #endif typedef HRESULT (*AVECALLBACK) (PBYTE pbData, LONG lDataLength); #define E_DEVICE_NOT_READY 0xB0004001L class DEVICECONTROL_API AVEControl { public: HRESULT StartRecordWithoutPreview(HWND hWndCap, CString FileName, __int64 pFileLength, UINT pFileMessage, BOOL pShowSetting = TRUE); HRESULT StartRecordWithPreview(HWND hWndCap, RECT rc, CString FileName, __int64 pFileLength, UINT pFileMessage, BOOL pShowSetting = TRUE); HRESULT StartPreview(HWND hWndCap, RECT rc); HRESULT SetVideoClippingWindow(HWND hwnd); HRESULT SetCallback(AVECALLBACK Callback); HRESULT GetVideoStatus(PUCHAR pSta); HRESULT SetVideoPosition(LPRECT lpSRCRect, LPRECT lpDSTRect); void GetCurrentImage(CString BmpFileFullName); BOOL IsGraphRunning(void); HRESULT StopGraph(void); HRESULT ApplySettings(CString IniFileFullName); HRESULT SetVideoProcAmp(long Property, long Value); HRESULT GetVideoProcAmp(long Property, long* Value); HRESULT GetEvent(long* EventCode, LONG_PTR* Param1, LONG_PTR* Param2, long msTimeout); HRESULT SetNotifyWindow(OAHWND hwnd, long lMsg, LONG_PTR lInstanceData); HRESULT InitDeviceControl(void); AVEControl(); virtual ~AVEControl(); }; #endif // !defined(AFX_AVECONTROL_H__4E171B4B_A11B_49F1_B41C_5F4A31B5CF08__INCLUDED_) Re: In C# ,How can i use a C++ DLL with a class being defined in head file. Andrei Ungureanu20-Jul-06 19:47 Andrei Ungureanu 20-Jul-06 19:47  you can try to create a DLL using the C++ class. After creating the DLL it's easier to use in c# with [DllImport] command. In c# char* becomes string byte* becomes byte[] and if you pass a value using reference like in your class "long* Value", use "ref log Value". Hope it helps Do your best to be the best

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