mirror of
https://github.com/reactos/reactos.git
synced 2024-11-19 05:22:59 +00:00
404 lines
10 KiB
C
404 lines
10 KiB
C
#include "screenshot.h"
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/*
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* Save a screenshot to file until the clipboard
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* is ready to accept images.
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*/
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static VOID
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GetError(VOID)
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{
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LPVOID lpMsgBuf;
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FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL,
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GetLastError(),
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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(LPTSTR) &lpMsgBuf,
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0,
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NULL );
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MessageBox(NULL,
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lpMsgBuf,
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_T("Error!"),
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MB_OK | MB_ICONERROR);
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LocalFree(lpMsgBuf);
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}
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static BOOL
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DoWriteFile(PSCREENSHOT pScrSht,
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LPTSTR pstrFileName)
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{
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BITMAPFILEHEADER bmfh;
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BOOL bSuccess;
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DWORD dwBytesWritten;
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HANDLE hFile;
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//INT PalEntries;
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hFile = CreateFile(pstrFileName,
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GENERIC_WRITE,
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0,
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NULL,
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CREATE_ALWAYS,
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FILE_ATTRIBUTE_NORMAL,
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NULL);
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if (hFile == INVALID_HANDLE_VALUE)
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return FALSE;
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/* write the BITMAPFILEHEADER to file */
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bmfh.bfType = *(WORD *)"BM"; // 0x4D 0x42
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bmfh.bfReserved1 = 0;
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bmfh.bfReserved2 = 0;
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bSuccess = WriteFile(hFile,
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&bmfh,
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sizeof(bmfh),
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&dwBytesWritten,
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NULL);
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if ((!bSuccess) || (dwBytesWritten < sizeof(bmfh)))
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goto fail;
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/* write the BITMAPINFOHEADER to file */
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bSuccess = WriteFile(hFile,
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&pScrSht->lpbi->bmiHeader,
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sizeof(BITMAPINFOHEADER),
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&dwBytesWritten,
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NULL);
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if ((!bSuccess) || (dwBytesWritten < sizeof(BITMAPINFOHEADER)))
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goto fail;
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/* calculate the size of the pallete * /
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if (pScrSht->lpbi->bmiHeader.biCompression == BI_BITFIELDS)
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PalEntries = 3;
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else
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{
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if (pScrSht->lpbi->bmiHeader.biBitCount <= 8)
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PalEntries = (INT)(1 << pScrSht->lpbi->bmiHeader.biBitCount);
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else
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PalEntries = 0;
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}
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if (pScrSht->lpbi->bmiHeader.biClrUsed)
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PalEntries = pScrSht->lpbi->bmiHeader.biClrUsed;
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/ * write pallete to file * /
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if (PalEntries != 0)
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{
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bSuccess = WriteFile(hFile,
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&pScrSht->lpbi->bmiColors,
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PalEntries * sizeof(RGBQUAD),
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&dwBytesWritten,
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NULL);
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if ((!bSuccess) || (dwBytesWritten < PalEntries * sizeof(RGBQUAD)))
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goto fail;
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}
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*/
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/* save the current file position at the bginning of the bitmap bits */
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bmfh.bfOffBits = SetFilePointer(hFile, 0, 0, FILE_CURRENT);
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/* write the bitmap bits to file */
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bSuccess = WriteFile(hFile,
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pScrSht->lpvBits,
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pScrSht->lpbi->bmiHeader.biSizeImage,
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&dwBytesWritten,
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NULL);
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if ((!bSuccess) || (dwBytesWritten < pScrSht->lpbi->bmiHeader.biSizeImage))
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goto fail;
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/* save the current file position at the final file size */
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bmfh.bfSize = SetFilePointer(hFile, 0, 0, FILE_CURRENT);
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/* rewrite the updated file headers */
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SetFilePointer(hFile, 0, 0, FILE_BEGIN);
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bSuccess = WriteFile(hFile,
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&bmfh,
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sizeof(bmfh),
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&dwBytesWritten,
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NULL);
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if ((!bSuccess) || (dwBytesWritten < sizeof(bmfh)))
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goto fail;
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return TRUE;
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fail:
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GetError();
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if (hFile) CloseHandle(hFile);
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DeleteFile(pstrFileName);
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return FALSE;
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}
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static BOOL
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DoSaveFile(HWND hwnd, LPTSTR szFileName)
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{
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OPENFILENAME ofn;
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static TCHAR Filter[] = _T("24 bit Bitmap (*.bmp,*.dib)\0*.bmp\0");
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ZeroMemory(&ofn, sizeof(ofn));
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ofn.lStructSize = sizeof(OPENFILENAME);
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ofn.hwndOwner = hwnd;
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ofn.nMaxFile = MAX_PATH;
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ofn.nMaxFileTitle = MAX_PATH;
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ofn.lpstrDefExt = _T("bmp");
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ofn.lpstrFilter = Filter;
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ofn.lpstrFile = szFileName;
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ofn.Flags = OFN_EXPLORER | OFN_PATHMUSTEXIST | OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT;
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if (GetSaveFileName(&ofn))
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return TRUE;
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if (CommDlgExtendedError() != CDERR_GENERALCODES)
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MessageBox(NULL, _T("Save to file failed"), NULL, 0);
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return FALSE;
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}
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static BOOL
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CaptureScreen(PSCREENSHOT pScrSht)
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{
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HDC ScreenDC;
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RECT rect;
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/* get window resolution */
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//pScrSht->Width = GetSystemMetrics(SM_CXSCREEN);
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//pScrSht->Height = GetSystemMetrics(SM_CYSCREEN);
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GetWindowRect(pScrSht->hSelf, &rect);
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pScrSht->Width = rect.right - rect.left;
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pScrSht->Height = rect.bottom - rect.top;
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/* get a DC for the screen */
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if (!(ScreenDC = GetDC(pScrSht->hSelf)))
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return FALSE;
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/* get a bitmap handle for the screen
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* needed to convert to a DIB */
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pScrSht->hBitmap = CreateCompatibleBitmap(ScreenDC,
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pScrSht->Width,
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pScrSht->Height);
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if (pScrSht->hBitmap == NULL)
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{
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GetError();
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ReleaseDC(pScrSht->hSelf, ScreenDC);
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return FALSE;
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}
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/* get a DC compatable with the screen DC */
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if (!(pScrSht->hDC = CreateCompatibleDC(ScreenDC)))
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{
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GetError();
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ReleaseDC(pScrSht->hSelf, ScreenDC);
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return FALSE;
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}
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/* select the bitmap into the DC */
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SelectObject(pScrSht->hDC,
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pScrSht->hBitmap);
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/* copy the screen DC to the bitmap */
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BitBlt(pScrSht->hDC,
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0,
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0,
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pScrSht->Width,
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pScrSht->Height,
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ScreenDC,
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0,
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0,
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SRCCOPY);
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/* we're finished with the screen DC */
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ReleaseDC(pScrSht->hSelf, ScreenDC);
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return TRUE;
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}
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static BOOL
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ConvertDDBtoDIB(PSCREENSHOT pScrSht)
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{
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INT Ret;
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BITMAP bitmap;
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WORD cClrBits;
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/*
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/ * can't call GetDIBits with hBitmap selected * /
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//SelectObject(hDC, hOldBitmap);
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/ * let GetDIBits fill the lpbi structure by passing NULL pointer * /
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Ret = GetDIBits(hDC,
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hBitmap,
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0,
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Height,
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NULL,
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lpbi,
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DIB_RGB_COLORS);
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if (Ret == 0)
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{
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GetError();
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ReleaseDC(hwnd, hDC);
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HeapFree(GetProcessHeap(), 0, lpbi);
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return -1;
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}
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*/
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////////////////////////////////////////////////////
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if (!GetObjectW(pScrSht->hBitmap,
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sizeof(BITMAP),
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(LPTSTR)&bitmap))
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{
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GetError();
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return FALSE;
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}
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cClrBits = (WORD)(bitmap.bmPlanes * bitmap.bmBitsPixel);
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if (cClrBits == 1)
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cClrBits = 1;
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else if (cClrBits <= 4)
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cClrBits = 4;
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else if (cClrBits <= 8)
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cClrBits = 8;
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else if (cClrBits <= 16)
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cClrBits = 16;
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else if (cClrBits <= 24)
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cClrBits = 24;
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else cClrBits = 32;
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if (cClrBits != 24)
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pScrSht->lpbi = (PBITMAPINFO) HeapAlloc(GetProcessHeap(),
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0,
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sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * (1 << cClrBits));
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else
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pScrSht->lpbi = (PBITMAPINFO) HeapAlloc(GetProcessHeap(),
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0,
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sizeof(BITMAPINFOHEADER));
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if (!pScrSht->lpbi)
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{
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GetError();
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return FALSE;
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}
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pScrSht->lpbi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
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pScrSht->lpbi->bmiHeader.biWidth = bitmap.bmWidth;
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pScrSht->lpbi->bmiHeader.biHeight = bitmap.bmHeight;
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pScrSht->lpbi->bmiHeader.biPlanes = bitmap.bmPlanes;
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pScrSht->lpbi->bmiHeader.biBitCount = bitmap.bmBitsPixel;
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if (cClrBits < 24)
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pScrSht->lpbi->bmiHeader.biClrUsed = (1 << cClrBits);
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pScrSht->lpbi->bmiHeader.biCompression = BI_RGB;
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pScrSht->lpbi->bmiHeader.biSizeImage = ((pScrSht->lpbi->bmiHeader.biWidth * cClrBits +31) & ~31) /8
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* pScrSht->lpbi->bmiHeader.biHeight;
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pScrSht->lpbi->bmiHeader.biClrImportant = 0;
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//////////////////////////////////////////////////////
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/* reserve memory to hold the screen bitmap */
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pScrSht->lpvBits = HeapAlloc(GetProcessHeap(),
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0,
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pScrSht->lpbi->bmiHeader.biSizeImage);
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if (pScrSht->lpvBits == NULL)
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{
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GetError();
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return FALSE;
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}
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/* convert the DDB to a DIB */
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Ret = GetDIBits(pScrSht->hDC,
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pScrSht->hBitmap,
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0,
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pScrSht->Height,
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pScrSht->lpvBits,
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pScrSht->lpbi,
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DIB_RGB_COLORS);
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if (Ret == 0)
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{
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GetError();
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return FALSE;
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}
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return TRUE;
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}
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// INT WINAPI GetScreenshot(BOOL bFullScreen)
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int WINAPI _tWinMain(HINSTANCE hInstance,
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HINSTANCE hPrevInstance,
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LPTSTR szCmdLine,
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int iCmdShow)
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{
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PSCREENSHOT pScrSht;
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TCHAR szFileName[MAX_PATH] = _T("");
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BOOL bFullScreen = TRUE;
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pScrSht = HeapAlloc(GetProcessHeap(),
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0,
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sizeof(SCREENSHOT));
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if (pScrSht == NULL)
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return -1;
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if (bFullScreen)
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{
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pScrSht->hSelf = GetDesktopWindow();
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}
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else
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{
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pScrSht->hSelf = GetForegroundWindow();
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}
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if (pScrSht->hSelf == NULL)
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{
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HeapFree(GetProcessHeap(),
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0,
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pScrSht);
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return -1;
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}
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if (CaptureScreen(pScrSht))
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{
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/* convert the DDB image to DIB */
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if(ConvertDDBtoDIB(pScrSht))
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{
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/* Get filename from user */
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if(DoSaveFile(pScrSht->hSelf, szFileName))
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{
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/* build the headers and write to file */
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DoWriteFile(pScrSht, szFileName);
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}
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}
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}
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/* cleanup */
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if (pScrSht->hSelf != NULL)
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ReleaseDC(pScrSht->hSelf, pScrSht->hDC);
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if (pScrSht->hBitmap != NULL)
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DeleteObject(pScrSht->hBitmap);
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if (pScrSht->lpbi != NULL)
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HeapFree(GetProcessHeap(),
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0,
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pScrSht->lpbi);
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if (pScrSht->lpvBits != NULL)
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HeapFree(GetProcessHeap(),
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0,
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pScrSht->lpvBits);
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if (pScrSht != NULL)
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HeapFree(GetProcessHeap(),
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0,
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pScrSht);
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return 0;
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}
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