- 1 year ago
Constant messages to retrieve information from a Delphi TcxGrid by using SendMessage API
To retrieve information from a Delphi TcxGrid using the SendMessage API, you can utilize the SendMessage
function provided by the Windows API. This function allows you to send specific messages to a window and retrieve the desired information. Here's an example of how you can use the SendMessage
API to retrieve information from a TcxGrid:
delphiconst
WM_GETTEXTLENGTH = $000E;
WM_GETTEXT = $000D;
function GetGridText(hwnd: THandle): string;
var
textLength: Integer;
buffer: array[0..255] of Char;
begin
// Get the length of the text in the grid
textLength := SendMessage(hwnd, WM_GETTEXTLENGTH, 0, 0);
// Initialize the buffer
ZeroMemory(@buffer, SizeOf(buffer));
// Retrieve the text from the grid
SendMessage(hwnd, WM_GETTEXT, SizeOf(buffer), LPARAM(@buffer));
// Return the retrieved text
Result := buffer;
end;
In the code above, WM_GETTEXTLENGTH
and WM_GETTEXT
are the Windows API messages used to retrieve the length of the text and the text itself from a window, respectively.
To use the GetGridText
function, you need to provide the handle (hwnd
) of the TcxGrid's window. You can obtain the handle by accessing the Handle
property of the TcxGrid control.
Here's an example of how you can call the GetGridText
function to retrieve the text from a TcxGrid:
delphivar
gridHandle: THandle;
gridText: string;
begin
// Get the handle of the TcxGrid control
gridHandle := cxGrid1.Handle;
// Retrieve the text from the grid
gridText := GetGridText(gridHandle);
// Display the retrieved text
ShowMessage(gridText);
end;
Make sure to replace cxGrid1
with the actual name of your TcxGrid control.
Please note that using the SendMessage
API requires understanding the specific messages and their parameters for the control you are working with. The examples provided assume that the TcxGrid control follows the standard behavior of Windows controls. However, different controls may have different message requirements, so you might need to refer to the documentation or explore the control's specific implementation to determine the appropriate messages to use for retrieving the desired information.