VC ++ 6.0 prohibits you from modifying the size of a single document window and the title.

 

In fact, it is not difficult to prohibit the modification of the size of a single document form and the title, so I will discuss the implementation of this item.

First, find the precreatewindow (createstruct & CS) function in the single document cmainframe (). This function is used to set some features of our form. Now, let's take a closer look at this function, as follows:

Bool cmainframe: precreatewindow (createstruct & CS)
{
If (! Cframewnd: precreatewindow (CS ))
Return false;
// Todo: Modify the window class or styles here by modifying
// The createstruct CS

Return true;
}

First, let's take a look at this parameter createstruct & CS, which is a reference to the createstruct structure. Well, let's look at msdn and look at this structure, as shown below:

Typedef struct tagcreatestruct {// CS
Lpvoid lpcreateparams;
Hinstance;
Hmenu;
Hwnd hwndparent;
Int Cy;
Int CX;
Int y;
Int X;
Long style;
Lpctstr lpszname;
Lpctstr lpszclass;
DWORD dwexstyle;
} Createstruct;

Let's take a look at these parameters one by one:

Lpvoid lpcreateparams: this parameter is used to point to the data that will be used to create a window.

Hinstance: this parameter identifies the handle of the module instance with a new window.

Hmenu: this parameter identifies the menu to be used in the new window. If it is a subwindow, it contains an integer ID.

Hwnd hwndparent: this parameter identifies a window with a new window. If the new window is a top-level window, this parameter can be null.

Int Cy: this parameter specifies the height of the new window.

Int CX: this parameter specifies the width of the new window.

Int Y: this parameter specifies the Y axis in the upper left corner of the new window. If the new window is a child window, the coordinates are relative to the parent window; otherwise, the coordinates are relative to the screen origin.

Int X: Specifies the x-axis coordinates in the upper left corner of the new window. If the new window is a child window, the coordinates are relative to the parent window; otherwise, the coordinates are relative to the screen origin.

Long style: this parameter specifies the style of the new window.

Lpctstr lpszname: this parameter points to a string ending with null and specifies the name of the new window.

Lpctstr lpszclass: this parameter points to a string ending with null and specifies the Windows Class Name of the new window (A wndclass structure; For more information, see the Win32 SDK documentation ).

DWORD dwexstyle: this parameter specifies the extended style of the new window.

Among these parameters, we usually use cy, CX, Y, X, style, and lpszname.

Now, in precreatewindow (createstruct & CS)
Add code to prohibit the change of the window size of a single document:

Bool cmainframe: precreatewindow (createstruct & CS)
{
If (! Cframewnd: precreatewindow (CS ))
Return false;
// Todo: Modify the window class or styles here by modifying
// The createstruct CS
CS. hmenu = NULL; // remove the menu
CS. Style & = ~ Ws_maximizebox; // disable the push maximization button
CS. Style & = ~ Ws_thickframe; // you are not allowed to change the window size.
CS. Cx = 700; // window width
CS. Cy = 500; // window height

CS. Style & = ~ Fws_addtotitle; // remove fws_addtotitle

CS. lpszname = "title" // change the title and replace the title.
Return true;
}

Here, we should note that when assigning values to these parameters, we need to use the & symbol to have another ~ Symbol:

CS. Style & = ~ Ws_maximizebox; // disable the push maximization button

This statement removes ws_maximizebox from the style. It is an inverse operation, similar to other operations.

// CS. Style & = ~ Ws_maximizebox | ~ Ws_minimizebox; remove the "maximize and minimize" button in the dialog box.
// CS. Style & = ~ Ws_maximizebox; // disable the push maximization button