How to modify a Report Preview window property

MORE INFORMATION

By default, you can minimize or maximize the Report Preview window by clicking the buttons in the upper-right corner of the Report Preview window. Because the Report Preview window is a system-generated window, you must to call API routines to modify the Report Preview window. This article contains a customized API routine to remove the Minimize button and the Maximize button from the Report Preview window. This API routine was written by using Microsoft Visual C++ 6.0. You can also write this API routine by using Microsoft Visual Studio .NET.

The following sample program uses a .dll file that was written by using Visual C++ 6.0. The sample program shows how to disable the Minimize property and the Maximize property of the Report Preview window through the Microsoft Win32 Software Development Kit (SDK).

Note This sample program contains many Visual C++ commands. The use of these commands is beyond the scope of Microsoft Visual FoxPro Product Support. Users who have significant experience using API routines should be able to write the following sample .dll file.

Create the .dll file that the sample program will use

1. Create a Win32 Dynamic-Link Library project in Visual C++ 6.0 or create a C++ Win32 project in Visual Studio .NET. Name the project Disable.
   
   Note If you use Visual Studio. NET, make sure that you change the application settings to reflect that this project is a .dll that exports symbols.
2. Replace all the code in the main .cpp file with the following code sample.

   #include "stdafx.h"
   #include "Disable.h"
   
   #define IDS_MEMVIEWCLASS        11005
   
   BOOL APIENTRY DllMain(HANDLE hInst, DWORD ul_reason_being_called, LPVOID
   lpReserved)
   {
      return 1;
   	   UNREFERENCED_PARAMETER(hInst);
   	   UNREFERENCED_PARAMETER(ul_reason_being_called);
   	   UNREFERENCED_PARAMETER(lpReserved);
   }
   
   void DISABLE_API disable(char *title, char *header) {
     // This line is a handle for parent window.
   	 HWND  hWnd,
     // This line is a handle for child window.
   		hChild;
   
     // Try to find the parent window of the Report Preview window.
   	hWnd = FindWindow(NULL, title);
   
   	char title1[75];
   
   	// Try to find the first child window.
   	hChild = GetWindow(hWnd,GW_CHILD);
   	while (hChild != 0) 
   	{
   	   hWnd = hChild;
   	 // Try to find the first sibling of the child window.
   	 hChild = GetWindow(hWnd,GW_HWNDNEXT);
   	 while (hChild != 0) 
   	 {
   		hWnd = hChild;
   		GetWindowText(hWnd,title1,75);
   		if (strcmp(title1,header) == 0) {
   		   DWORD L;
   	 // Disable the Minimize button and the Maximize button of the Report Preview window.
   		   L = GetWindowLong(hChild, GWL_STYLE);
   		   L = L & ~(WS_MINIMIZEBOX);
   		   L = L & ~(WS_MAXIMIZEBOX);
   		   SetWindowLong(hChild,GWL_STYLE,L);
   		   // Redraw the Report Preview window.
   		   SetWindowPos(hChild,NULL,0,0,0,0,
   SWP_DRAWFRAME|SWP_NOZORDER|SWP_NOMOVE|SWP_NOSIZE);
   		   return;
   		}
   		hChild = GetWindow(hWnd,GW_HWNDNEXT);
   	 }
   	 hChild = GetWindow(hWnd,GW_CHILD);
   	}
     return;
   }

3. Open the header file. Add the following line of code at the bottom of the file.

   extern "C" DISABLE_API void disable(char *, char *);
   

4. In the header file, remove the declarations for any other functions.
5. Build the project to create the Disable.dll file.

Create the sample program for Visual FoxPro

Use the following code sample for Visual FoxPro 7.0.

REPORT FORM HOME(2)+"tastrade\reports\salessum.frx" PREVIEW nowait
DECLARE integer disable IN KBTest.DLL string, string
=disable("Microsoft Visual FoxPro",;
"Report Designer - salessum.frx - Page 1")

Use the following code sample for Visual FoxPro 8.0 and for Visual FoxPro 9.0.

REPORT FORM HOME(2)+"solution\reports\colors.frx" PREVIEW nowait
DECLARE integer disable IN KBTest.DLL string, string
=disable("Microsoft Visual FoxPro",;
"Report Designer - colors.frx - Page 1")

Sample program notes

• To create a .dll file in Visual C++, see the Help file in Microsoft Visual C++ 6.0 or in Visual Studio .NET.
• Save the Disable.dll file in the same folder as your project or in the path of the Windows Win32 folder.
• The API function must have two parameters. The first parameter is the caption of the main application window. Typically, this window is a Visual FoxPro window. The second parameter is the caption of the Report Preview window for which you want to disable the Minimize button and the Maximize button. If, for any reason, the sample program does not work correctly, verify the captions of these windows and then run the sample program again.