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CaptureScreenDll

 

Demonstrates .dll in Win32 with single capture_screen function

 

 

main.cpp

 

#include <CtrlLib/CtrlLib.h>

#include <plugin/bmp/bmp.h>

#include <plugin/jpg/jpg.h>

#include <plugin/gif/gif.h>

#include <plugin/tif/tif.h>

 

using namespace Upp;

 

Image ScreenShot(int x, int y, int cx, int cy)

{

    HDC dcScreen = CreateDC("DISPLAY", NULL, NULL, NULL);

 

    RGBA *pixels;

 

    Buffer<byte> data;

    data.Alloc(sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD)*256);

    BITMAPINFOHEADER *hi = (BITMAPINFOHEADER *) ~data;;

    memset(hi, 0, sizeof(BITMAPINFOHEADER));

    hi->biSize = sizeof(BITMAPINFOHEADER);

    hi->biPlanes = 1;

    hi->biBitCount = 32;

    hi->biCompression = BI_RGB;

    hi->biSizeImage = 0;

    hi->biClrUsed = 0;

    hi->biClrImportant = 0;

    hi->biWidth = cx;

    hi->biHeight = -cy;

 

    HBITMAP hbmp = CreateDIBSection(dcScreen, (BITMAPINFO *)hi, DIB_RGB_COLORS, (void **)&pixels, NULL, 0);

    HDC dcMem = ::CreateCompatibleDC(dcScreen);

    HBITMAP hbmpOld = (HBITMAP) ::SelectObject(dcMem, hbmp);

    HDC hdcCompatible = CreateCompatibleDC(dcScreen);

    ::BitBlt(dcMem, 0, 0, cx, cy, dcScreen, x, y, SRCCOPY);

    

    ImageBuffer ib(cx, cy);

    memcpy(~ib, pixels, cx * cy * sizeof(RGBA));

    

    ::DeleteObject(::SelectObject(dcMem, hbmpOld));

    ::DeleteDC(dcMem);

    ::DeleteDC(dcScreen);

    

    return ib;

};

 

extern "C" __declspec(dllexport) int capture_screen(int x, int y, int cx, int cy, char *filename) {

    Image m = ScreenShot(x, y, cx, cy);

    String ext = ToLower(GetFileExt(filename));

    if(ext == ".png")

        PNGEncoder().SaveFile(filename, m);

    if(ext == ".bmp")

        BMPEncoder().Bpp(32).SaveFile(filename, m);

    if(ext == ".jpg")

        JPGEncoder().SaveFile(filename, m);

    if(ext == ".gif")

        GIFEncoder().SaveFile(filename, m);

    if(ext == ".tif" || ext == ".tiff")

        TIFEncoder().SaveFile(filename, m);

    return 0;

}

 

DLL_APP_MAIN {

}

 

 

 

 

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