C ++ win32 development of GDIPlus textures

// Add Gdiplus. lib

// Use three images to name 2.png 3.png 9.png respectively.

// Use VC or vs to create an empty project win32, add the file winmain. cpp, and add the following content to the file

# Include <windows. h>
# Include <stdio. h>
# Include <stdlib. h>
# Include <gdiplus. h>

Bool m_bTest = true;

WCHAR strImgName [100];

Int m_number = 0;

/* GDI + startup token */
ULONG_PTR gdiplusStartupToken;

PAINTSTRUCT ps; // point structure

Int m_waveData [300];

// Message callback function, including interface messages
Lresult callback MyWindowProc (
HWND hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam
);

// Main function entry
Int WINAPI WinMain (HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
Int nCmdShow)
{

/* Initialize GDIpuls */
Gdiplus: GdiplusStartupInput gdiInput;
Gdiplus: GdiplusStartup (& gdiplusStartupToken, & gdiInput, NULL );

// Initialize the image name

Wcscpy (strImgName, L "2.png ");

WNDCLASS wndclass; // form class
Wndclass. cbClsExtra = 0;
Wndclass. cbWndExtra = 0;
Wndclass. hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH );
Wndclass. hCursor = LoadCursor (0, IDC_HAND );
Wndclass. hIcon = LoadIcon (0, IDI_INFORMATION );
Wndclass. hInstance = hInstance;
Wndclass. lpfnWndProc = MyWindowProc;
Wndclass. lpszClassName = TEXT ("hg ");
Wndclass. lpszMenuName = NULL;
Wndclass. style = CS_HREDRAW | CS_VREDRAW; // specify the form style
// Registration type
If (! RegisterClass (& wndclass ))
{
MessageBox (0, TEXT ("reg err"), TEXT ("reg err"), 0 );
}
// Create a form
HWND hwnd = CreateWindow (TEXT ("hg"), TEXT ("Helloworldhhh"), WS_OVERLAPPEDWINDOW, 0, 0, 1024,768, NULL, NULL, hInstance, NULL );
If (! Hwnd)
{
MessageBox (hwnd, TEXT ("create windows err"), TEXT ("create windows err"), 0 );
}
// Display form
ShowWindow (hwnd, SW_SHOW );
UpdateWindow (hwnd );

MSG msg;
// Message Processing
While (GetMessage (& msg, 0, 0, 0 ))
{
TranslateMessage (& msg );
DispatchMessage (& msg );
}

Return 0;
}

Lresult callback MyWindowProc (
HWND hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam
)
{
Int wmId, wmEvent;

Switch (uMsg)
{
Case WM_CLOSE:
{
Gdiplus: GdiplusShutdown (gdiplusStartupToken );
PostQuitMessage (0 );
}
Break;
Case WM_DESTROY:
PostQuitMessage (0 );
Break;
Case WM_RBUTTONDBLCLK: // right-click
// MessageBox (NULL, "dd", "ss", MB_ OK );
// DestroyWindow (hwnd );
Break;
Case WM_LBUTTONDOWN: // Click left to switch the display image
If (m_bTest)
{
Wcscpy (strImgName, L "3.png ");
M_bTest = false;
} Else
{
Wcscpy (strImgName, L "2.png ");
M_bTest = true;
}

RedrawWindow (hwnd, NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW );

Break;
Case WM_KEYDOWN: // Keyboard Message
{
Switch (wParam)
{
Case VK_LEFT: // left-click
{
Wcscpy (strImgName, L "3.png ");
}
Break;
Case VK_RIGHT: // right-click
{
Wcscpy (strImgName, L "2.png ");
}
Break;
Case VK_ESCAPE:
{
Gdiplus: GdiplusShutdown (gdiplusStartupToken );
PostQuitMessage (0 );
}
Break;
}
// When there is an interface modification, update and redraw. Remember not to redraw the background.
RedrawWindow (hwnd, NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW );
}
Break;
Case WM_PAINT:
{

HDC hdc; // DC handle
HPEN hPen; // pen handle
HPEN hPenOld; // The handle used to save the original pen.
Hdc = BeginPaint (hwnd, & ps); // obtain the DC handle and start painting. hWnd is the window handle.

Using namespace Gdiplus; // Add to namespace

RECT rc;
GetClientRect (hwnd, & rc );
Bitmap bmp (int (rc. right), int (rc. bottom ));

Graphics bmp Graphics (& bmp );
BMP graphics. SetSmoothingMode (SmoothingModeAntiAlias );

/* Drawing on bitmap */
// SolidBrush bkBrush (Color (0, 0 ));
// BMP graphics. FillRectangle (& bkBrush, 0, 0, rc. right, rc. bottom );

Gdiplus: Image image2 (L "9.png ");

Gdiplus: Image image (strImgName );

Gdiplus: Graphics graphics (hdc );

BMP graphics. DrawImage (& image2, 600,400 );
BMP graphics. DrawImage (& image, 100,100,300,100 );

/* Important! Create a CacheBitmap object for quick drawing */

BMP graphics. DrawImage (& image2, 600,400 );
BMP graphics. DrawImage (& image, 100,100,300,100 );

Gdiplus: FontFamily fontFamily (L "Times New Roman"); // create a font family object

Gdiplus: Font font (& fontfamily, 20); // create the Times New Roman font of the 5th character size

Gdiplus: solidbrush brush (gdiplus: color (255,128, 50); // create a green solid brush (for string writing)

For (INT I = 0; I <4; I ++)
{
BMP graphics. drawstring (strimgname,-1, & font, gdiplus: pointf (400,110 * I + 20), & brush );
}

Cachedbitmap cachedbmp (& BMP, & graphics );

// Submit at the same time to avoid flickering screen

Graphics. DrawCachedBitmap (& cachedBmp, 0, 0 );

Gdiplus: Pen myPen (Gdiplus: Color (255,128, 50 ));

// For (int I = 0; I <300; I ++)
//{
// Graphics. DrawLine (& myPen, 300,200 );
//}

HPen = CreatePen (PS_SOLID, 3, RGB (255, 0, 0); // create a red paint brush with a width of 3
HPenOld = (HPEN) SelectObject (hdc, hPen); // select DC
Movetoex (HDC, 20, 10, null); // The last parameter is the structure pointer of the old current vertex returned.
// Lineto (HDC, 200,100); // draw a line

Deleteobject (Hpen); // Delete the pen you have created

Endpaint (hwnd, & PS); // draw end

}
Break;
// Case wm_erasebkgnd:
// Break;
Default:
Return defwindowproc (hwnd, umsg, wparam, lparam );
}
Return 0;
}