Get a form's hdc

[PT Exorcist]

how do i get it under .net?

[Cander]

System.Windows.Forms.Form.CreateGraphics.GetHdc

[PT Exorcist]

yes ty i made a search and discovered that tks..anyways im getting an error while trying to implement that in C#:

    public class test {
        [DllImport("user32.dll")]
        public static extern int DrawText(IntPtr hdc, string lpStr, int nCount, RECT lpRect, int wFormat);

        public struct RECT {
            public RECT(int top, int left, int right, int bottom) {
                Top = top;
                Left = left;
                Right = right;
                Bottom = bottom;
            }

            int Top;
            int Left;
            int Right; 
            int Bottom;
        }


        private enum DT {
            LEFT = 0,
            CENTER = 1,
            RIGHT = 2,
            VCENTER = 4,
            SINGLELINE = 32,
            BOTTOM = 8,
            CALCRECT = 1024,
            EXPANDTABS = 64,
            INTERNAL = 4096,
            WORDBREAK = 16,
            TABSTOP = 128,
            NOPREFIX = 2048,
            NOCLIP = 256,
            EXTERNALLEADING = 512,
        }

        public static void Teste(Form parent) {
            Graphics graphics = parent.CreateGraphics();
            IntPtr formHdc = graphics.GetHdc();
            string str = "oiiiiiiiii!";
            RECT rect = new RECT(0, 0, 100, 100);

            DrawText(formHdc, str, str.Length, rect, 64);
        } 

        private void Form1_Load(object sender, System.EventArgs e) {
            test.Teste(this);
        } 

i get an "Object reference not set to an instance of an object." why?

also i know in .net i dont things with api but i am just testing how api works here..

[Cander]

where do you get the error?

[PT Exorcist]

in the DrawText() function

[PT Exorcist]

DrawText(formHdc, str, str.Length, rect, 64); here i mean

[Cander]

I dont get it. I tried to get it working...

All I can figure is that it must be the formhdc variable.

[hellswraith]

It looks like your just trying to draw text on a form....is that what your doing? If so, you don't need the api at all. You can use the DrawString method of the graphics object along with a Brush object and Font object to get your desired effect.