[英]C# trying to type text on a .bmp
I'm trying to type text into a .bmp, normally the background of the textbox is black and i would like to change it to a .bmp. 我正在尝试将文本键入.bmp,通常文本框的背景为黑色,我想将其更改为.bmp。 The name of the .bmp is 205.bmp.
.bmp的名称是205.bmp。 I found this code which i think sets the background of the Richtextbox to black.
我发现了这段代码,我认为它会将Richtextbox的背景设置为黑色。 How do I change it to work with a picture background ?
如何将其更改为与图片背景配合使用?
public Bitmap RtbToBitmap(RichTextBox rtb, int width, int height)
{
Bitmap bmp = new Bitmap(width, height, PixelFormat.Format24bppRgb);
using (Graphics gr = Graphics.FromImage(bmp))
{
gr.Clear(Color.Black);
System.IntPtr hDC = gr.GetHdc(); // 屏幕做为画源
FORMATRANGE fmtRange;
RECT rect;
int fromAPI;
float inch = 100F;
rect.Top = 10;
rect.Left = 10;
rect.Bottom = (int)(bmp.Height + (bmp.Height * (bmp.HorizontalResolution / 100)) * inch);
rect.Right = bmp.Width * 15;
fmtRange.chrg.cpMin = 0;
fmtRange.chrg.cpMax = -1;
fmtRange.hdc = hDC;
fmtRange.hdcTarget = hDC;
fmtRange.rc = rect;
fmtRange.rcPage = rect;
int wParam = 1;
System.IntPtr lParam = System.Runtime.InteropServices.Marshal.AllocCoTaskMem(Marshal.SizeOf(fmtRange));
System.Runtime.InteropServices.Marshal.StructureToPtr(fmtRange, lParam, false);
fromAPI = SendMessage(rtb.Handle, EM_FORMATRANGE, wParam, lParam);
System.Runtime.InteropServices.Marshal.FreeCoTaskMem(lParam);
fromAPI = SendMessage(rtb.Handle, EM_FORMATRANGE, wParam, new IntPtr(0));
gr.ReleaseHdc(hDC);
}
return bmp;
}
Can anyone help me? 谁能帮我?
public Bitmap RtbToBitmap(RichTextBox rtb)
{
Bitmap bmp = // Load your Image here
using (Graphics gr = Graphics.FromImage(bmp))
{
// gr.Clear(Color.Black); // Don't clear it with black
System.IntPtr hDC = gr.GetHdc(); // 屏幕做为画源
FORMATRANGE fmtRange;
RECT rect;
int fromAPI;
float inch = 100F;
rect.Top = 10;
rect.Left = 10;
rect.Bottom = (int)(bmp.Height + (bmp.Height * (bmp.HorizontalResolution / 100)) * inch);
rect.Right = bmp.Width * 15;
fmtRange.chrg.cpMin = 0;
fmtRange.chrg.cpMax = -1;
fmtRange.hdc = hDC;
fmtRange.hdcTarget = hDC;
fmtRange.rc = rect;
fmtRange.rcPage = rect;
int wParam = 1;
System.IntPtr lParam = System.Runtime.InteropServices.Marshal.AllocCoTaskMem(Marshal.SizeOf(fmtRange));
System.Runtime.InteropServices.Marshal.StructureToPtr(fmtRange, lParam, false);
fromAPI = SendMessage(rtb.Handle, EM_FORMATRANGE, wParam, lParam);
System.Runtime.InteropServices.Marshal.FreeCoTaskMem(lParam);
fromAPI = SendMessage(rtb.Handle, EM_FORMATRANGE, wParam, new IntPtr(0));
gr.ReleaseHdc(hDC);
}
return bmp;
}
That should do what you want 那应该做你想要的
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