All of the parameters are optional except for the first two, opcode and ctlid, which together are sufficient to delete the control. Even when adding a new control, the last several parameters are only needed when you want to do something slightly unusual or fancy. Refer to the documentation on the individual parameters below for deciding how many you need to specify for a particular effect.
In the case of opcode CTLOP_INFO, all of the parameters besides opcode may be updated. The indicators in the I/O column ignore this case and apply only to the opcodes other than CTLOP_INFO.
|
Parameter |
Type |
I/O |
Description |
|
in |
Determines the "method" or operation to perform. | ||
|
in/out |
Control ID: an integer starting from 1, or an alphanumeric name, that uniquely identifies each control. | ||
|
in/out |
Text associated with the control. For most typical controls (buttons, static text, checkbox, etc.) this is the text that appears in the control. | ||
|
B,4 |
in |
State of the control (enabled, disabled, hidden, etc.). | |
|
B,4 |
in |
Control type and attributes. For more exotic controls, leave this zero and use winclass, winstyle, winstylex. | |
|
in |
Specifies the command or keyboard string which is invoked when the control is clicked. | ||
|
String or B,1 |
in/out |
When the cmd type is DLL, this can specify a function within the DLL to execute. For checkboxes, func is a 1-byte binary which gets set and cleared along with the display state of the checkbox. | |
|
signed Num |
in/out |
Returns status indicating success of operation. For some opcodes, it is used as an input also. | |
|
in |
Coordinates of the control. | ||
|
in |
Foreground and background color palette numbers for the control. | ||
|
in |
Used to override the default font attributes for the control. | ||
|
in |
Scales the font to the specified percentage. | ||
|
in |
Overrides the default font selection. | ||
|
in |
Defines a "tooltip" (popup message) | ||
|
in |
If specified, new control becomes child of specified control. | ||
|
in |
May be used as an alternative to ctype to create a control using the standard Windows control classes and styles. | ||
|
B,4 |
in |
Extension of ctype; control type and attributes. |