i work on project with wni 32 API in VC++6.0.
i have function that take an argument whose this is a HWND variable.
i want minimize window that have this handle.
this is source of my function

void min2(HWND hwnd){
typedef struct POINT{
long x;
long y;
}point;


typedef struct RECT{
long int top;
long int bottom;
long int left;
long int right;
}rect;
typedef struct tagWINDOWPLACEMENT {
UINT length;
UINT flags;
UINT showCmd;
POINT ptMinPosition;
POINT ptMaxPosition;
RECT rcNormalPosition;
} mn;
tagWINDOWPLACEMENT *PWINDOWPLACEMENT, *PWT;
tagWINDOWPLACEMENT myWP;

myWP.length = sizeof(WINDOWPLACEMENT);
myWP.showCmd = SW_SHOWMINIMIZED;
myWP.flags = WPF_SETMINPOSITION;

myWP.ptMinPosition.x = (long)0;
myWP.ptMinPosition.y = (long)0;
myWP.rcNormalPosition.left = (long)10;
myWP.rcNormalPosition.top = (long)100;
myWP.rcNormalPosition.right = (long)100;
myWP.rcNormalPosition.bottom = (long)100;



PWT = &myWP;

if (IsWindow(hwnd))
::SetWindowPlacement(hwnd ,*PWT);


return;
}

VC take an error in compiling that i do not understand it?
i do all work that i can do but .....

e:\myspy\winspy.cpp(402) : error C2664: 'SetWindowPlacement' : cannot convert parameter 2 from 'struct min2::tagWINDOWPLACEMENT' to 'const struct tagWINDOWPLACEMENT *'
No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
Error executing cl.exe.

very thanks for any reply

Why do you need all these "typedef struct ..."?
These are all defined in WINDOWS.H.

To pass an address of structure to a function - simply pass "&myMN" or whatever. No need to put it into some variable. You have passed "*ptr" and that means pass whole structure and not the pointer. That is the cause of compiler error.

This function will work without need of any structures:
http://msdn.microsoft.com/en-us/library/ms633548(VS.85).aspx