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Visual Basic 6 definition

Declare Function BitBlt Lib "gdi32.dll" (ByVal hdcDest As Long, ByVal nXDest As Long, ByVal nYDest As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hdcSrc As Long, ByVal nXSrc As Long, ByVal nYSrc As Long, ByVal dwRop As Long) As Long

Visual Basic .NET definition

Declare Function BitBlt Lib "gdi32" (ByVal hDestDC As Integer, ByVal x As Integer, ByVal y As Integer, ByVal nWidth As Integer, ByVal nHeight As Integer, ByVal hSrcDC As Integer, ByVal xSrc As Integer, ByVal ySrc As Integer, ByVal dwRop As Integer) As Integer

C# definition

[DllImport("gdi32")] public static extern int BitBlt(int hDestDC, int x, int y, int nWidth, int nHeight, int hSrcDC, int xSrc, int ySrc, int dwRop)

Description

BitBlt performs a bit-block transfer of a rectangular portion of an image from one device to another. The dimensions of the transfered rectangle are perfectly preserved. The function can perform a variety of raster operations to transfer the block from the source device to the target device. BitBlt Performs a bit-block transfer. System.Drawing.Graphics.DrawImage BitBlt Performs a bit-block transfer. System.Drawing.Graphics.DrawImage

Return Value

If an error occured, the function returns 0 (Windows NT, 2000: use GetLastError to get the error code). If successful, the function returns a non-zero value.

Parameters

hdcDest A handle to the device context of the device which receives the transfered image block. nXDest The x-coordinate of the point to position the upper-left corner of the transfered image block. nYDest The y-coordinate of the point to position the upper-left corner of the transfered image block. nWidth The width in pixels of the image block. nHeight The height in pixels of the image block. hdcSrc A handle to the device context of the device which contains the image block to transfer. nXSrc The x-coordinate of the upper-left corner of the image block to transfer. nYSrc The y-coordinate of the upper-left corner of the image block to transfer. dwRop One of the following flags identifying the raster operation to use to transfer the image block. Each raster operation uses the RGB color value of the source and/or target pixel to determine the new color of the target pixel. BLACKNESS Fill the destination rectangle with the color whose index is 0 in the physical palette (which is black by default). CAPTUREBLT Windows 98, 2000: Include any windows layered on top of the window being used in the resulting image. DSTINVERT Invert the colors in the destination rectangle. MERGECOPY Merge the colors of the source rectangle with the specified pattern using the bitwise AND operator. MERGEPAINT Merge the colors of the inverted source rectangle with the colors of the destination rectangle using the bitwise OR operator. NOMIRRORBITMAP Windows 98, 2000: Prevent the bitmap from being mirrored. NOTSRCCOPY Copy the inverted source rectangle to the destination rectangle. NOTSRCERASE Combine the colors of the source and destination rectangles using the bitwise OR operator and then invert the resulting color. PATCOPY Copy the specified pattern into the destination bitmap. PATINVERT Combine the colors of the specified pattern with the colors of the destination rectangle using the bitwise XOR operator. PATPAINT Combine the colors of the specified pattern with the colors of the inverted source rectangle using the bitwise OR operator. Combine the result of that operation with the colors of the destination rectangle using the bitwise OR operator. SRCAND Combine the colors of the source and destination rectangles using the bitwise AND operator. SRCCOPY Copy the source rectangle directly into the destination rectangle. SRCERASE Combine the inverted colors of the destination rectangle with the colors of the source rectange using the bitwise AND operator. SRCINVERT Combine the colors of the source and destination rectangles using the bitwise XOR operator. SRCPAINT Combine the colors of the source and destination rectangles using the bitwise OR operator. WHITENESS Fill the destination rectangle with the color whose index is 1 in the physical palette (which is white by default).

Constants

Const BLACKNESS = &H42 ' Const CAPTUREBLT = ??? Const DSTINVERT = &H550009 Const MERGECOPY = &HC000CA Const MERGEPAINT = &HBB0226 ' Const NOMIRRORBITMAP = ??? Const NOTSRCCOPY = &H330008 Const NOTSRCERASE = &H1100A6 Const PATCOPY = &HF00021 Const PATINVERT = &H5A0049 Const PATPAINT = &HFB0A09 Const SRCAND = &H8800C6 Const SRCCOPY = &HCC0020 Const SRCERASE = &H440328 Const SRCINVERT = &H660046 Const SRCPAINT = &HEE0086 Const WHITENESS = &HFF0062

Further Information:

For further information on Windows API functions such as these, and how to use these API's in your C# and VB.NET applications, please refer to the book 'Network programming in .NET' (Buy at Amazon UK) (Buy at Amazon US)

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