LibN Upgrading PInvoke methods in a single project solution
#Getwindowtext visual basic example code#
In summary the new structure of WinAPI code will be: The second two generated files (named user32 and gdi too) will be generated in the folder named PInvokeUnsafeNative, where will be stored the PInvoke declaration code. It means if there are two external methods, one using a user32 library method and the other referencing a gdi library method, the VBUC will generate two files (user32 and gdi) in a folder inside the solution named by default PInvokeSafeNative, it will contain any additional code related to castings, marshaling, error handling, freeing memory and so on, and it will have the manage code that will reference the unmanaged code. The quantity of files will depend on the number of libraries are being used in project(s). Structure of new PInvoke generated filesĪs you can note in previous section a declaration of a VB6 external method will generate two files. Public Sub MessageBeep( ByVal wType As Short)ĭeclare Sub MessageBeep Lib "user32" ( ByVal wType As Short)Īs C# code, VB.NET code presents two files with similar information to C# ones, changing only in the way of PInvoke declaration is written in VB, very similar to VB6. In this case there is neither marshaling nor additional code because this function doesn’t need it, but in this method is where this code would be generated. The source invocation would be converted pointing to the SafeNative method. The first one (UnsafeNative) containing the corresponding PInvoke method declaration of the “MessageBeep” and the second one (SafeNative) with a simple invocation to the PInvoke method. Two files are generated as result of the external method declaration. Public extern static void MessageBeep( short wType) Public static void MessageBeep( short wType) This is the corresponding upgraded code in. Notice additionally an invocation to that external method.ĭeclare Sub MessageBeep Lib "user32" ( ByVal wType As Integer)
#Getwindowtext visual basic example windows#
The following is a simple example that beeps a sound using the external method named MessageBeep in the “user32.dll” windows library. Declare Function globalname Lib libname$ The VB6 syntax of a Declare statement is: String titleForm1 = new string(Strings.Chr(0)) Private void Command1_Click(Object eventSender, EventArgs eventArgs) Return (hwnd) įile: user32.cs (unsafe methods) Įxtern public static int GetWindowText( int hwnd, ref string lpString, int cch) Įxtern public static int GetWindowTextLength( int hwnd) } File: Form1.cs Public static int GetWindowTextLength( int hwnd) Public static int GetWindowText( int hwnd, ref string lpString, int cch)
GetWindowText Me.hwnd, titleForm1, Len(titleForm1) TitleForm1 = String(GetWindowTextLength( Me.hwnd) + 1, Chr$(0))
Private Declare Function GetWindowTextLength Lib "user32" Alias "GetWindowTextLengthA" ( ByVal hwnd As Long) As Long Private Declare Function GetWindowText Lib "user32" Alias "GetWindowTextA" ( ByVal hwnd As Long, ByVal lpString As String, ByVal cch As Long) As Long If your API calls were for example to user32.dll then a file with that name will generated and all PInvoke calls to that DLL will be arranged inside that file.īelow you can see an example of how the code is upgraded. Inside those folder a file will be created grouping PInvoke calls per DLL. So for example if your solution name is UpgradeSolution1 a folder called UpgradeSolution1Support will be created with a project with the same name. In the lastest version of the VBUC this project will usually be called with the same name as your VBUC solution + Support. When this project is migrated using the VBUC it will generate a Visual Studio Solution like the following: This refactoring functionality will produce more readable and maintainable codeįor example if you had a VB6 project with a couple of forms like the following: Using this Wrapper files allows for easy replacement of unmanaged APIs The VBUC creates a wrapper for each unmanaged API declaration. Redundant API declarations will be converted to a single declaration, in an API declarations project.Īll uses of these APIs will be redirected to this single declaration
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