使用Win Ce6的屏幕截图 [英] Screenshot using Win CE6
本文介绍了使用Win Ce6的屏幕截图的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我已经设法启动并运行了一些东西，但它不能给出完整的位图。相反，它只提供位图的下半部分。对于哪里出了问题，有什么建议吗？
截图编码：
HWND DesktopHwnd = ::GetDesktopWindow();
RECT DesktopParams;
HDC DevC = ::GetDC(DesktopHwnd);
::GetWindowRect(DesktopHwnd,&DesktopParams);
DWORD Width = DesktopParams.right - DesktopParams.left;
DWORD Height = DesktopParams.bottom - DesktopParams.top;
// get the device context of the screen
HDC hScreenDC = CreateDC(_T("DISPLAY"), NULL, NULL, NULL);
// and a device context to put it in
HDC hMemoryDC = CreateCompatibleDC(hScreenDC);
int x = GetDeviceCaps(hScreenDC, HORZRES);
int y = GetDeviceCaps(hScreenDC, VERTRES);
// maybe worth checking these are positive values
HBITMAP hBitmap = CreateCompatibleBitmap(hScreenDC, x, y);
// get a new bitmap
HBITMAP hOldBitmap = (HBITMAP)SelectObject(hMemoryDC, hBitmap);
BitBlt(hMemoryDC, 0, 0, Width, Height, hScreenDC, 0, 0, SRCCOPY);
hBitmap = (HBITMAP)SelectObject(hMemoryDC, hOldBitmap);
// now your image is held in hBitmap. You can save it or do whatever with it
HWND hwnd = DesktopHwnd;
PBITMAPINFO pbi;
HBITMAP hBMP = hBitmap;
HDC hDC = DevC;
HANDLE hf; // file handle
BITMAPFILEHEADER hdr; // bitmap file-header
PBITMAPINFOHEADER pbih; // bitmap info-header
DWORD dwTotal; // total count of bytes
DWORD cb; // incremental count of bytes
BYTE *hp; // byte pointer
DWORD dwTmp;
int ret = 0;
pbi = CreateBitmapInfoStruct(NULL, hBMP);
if(pbi == NULL)
{
}
pbih = (PBITMAPINFOHEADER) pbi;
RGBQUAD *rgbq;
rgbq = pbi->bmiColors;
PALETTEENTRY pe[256];
GetSystemPaletteEntries(hDC, 0, pbih->biClrUsed, pe);
for(DWORD i = 0; i < pbih->biClrUsed; i++)
{
rgbq[i].rgbRed = pe[i].peRed;
rgbq[i].rgbBlue = pe[i].peBlue;
rgbq[i].rgbGreen = pe[i].peGreen;
rgbq[i].rgbReserved = 0;
}
// CE5.0 + CE6.0
HBITMAP h = CreateDIBSection(hScreenDC, pbi, DIB_RGB_COLORS, (void **)&hp, NULL, 0);
if(h == NULL)
{
goto close_bmp;
}
SelectObject(hMemoryDC, h);
BitBlt(hMemoryDC, 0, 0, Width, Height, hScreenDC, 0, 0, SRCCOPY);
// Create the .BMP file.
hf = CreateFile(_T("\FlashDisk\image1.bmp"),GENERIC_READ | GENERIC_WRITE,(DWORD) 0, NULL,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
(HANDLE) NULL);
if (hf == INVALID_HANDLE_VALUE)
{
goto close_bmp;
}
hdr.bfType = 0x4D42; // 0x42 = "B" 0x4d = "M"
// Compute the size of the entire file.
hdr.bfSize = (DWORD) (sizeof(BITMAPFILEHEADER) + pbih->biSize + pbih->biClrUsed * sizeof(RGBQUAD) + pbih->biSizeImage);
hdr.bfReserved1 = 0;
hdr.bfReserved2 = 0;
// Compute the offset to the array of color indices.
hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) +
pbih->biSize + pbih->biClrUsed
* sizeof (RGBQUAD);
// Copy the BITMAPFILEHEADER into the .BMP file.
if (!WriteFile(hf, (LPVOID) &hdr, sizeof(BITMAPFILEHEADER),
(LPDWORD) &dwTmp, NULL))
{
goto close_bmp;
}
// Copy the BITMAPINFOHEADER and RGBQUAD array into the file.
if (!WriteFile(hf, (LPVOID) pbih, sizeof(BITMAPINFOHEADER)
+ pbih->biClrUsed * sizeof (RGBQUAD),
(LPDWORD) &dwTmp, ( NULL)))
{
}
// Copy the array of color indices into the .BMP file.
dwTotal = cb = pbih->biSizeImage;
//hp = lpBits;
if (!WriteFile(hf, (LPSTR) hp, (int) cb, (LPDWORD) &dwTmp,NULL))
{
goto close_bmp;
}
close_bmp:
// Close the .BMP file.
if(hf != INVALID_HANDLE_VALUE)
{
if (!CloseHandle(hf))
{
int xyz = 2;
xyz = 3;
}
else
{
ret = 1;
}
}
if(h != NULL)
DeleteObject(h);
if(pbi != NULL)
{
free(pbi);
}
// clean up
if(hMemoryDC != NULL)
DeleteDC(hMemoryDC);
DeleteDC(hScreenDC);
干杯。
推荐答案
我终于得到了一个屏幕截图。这可能会帮助其他人在未来从Win Ce6应用程序中截屏。希望这能帮助其他人。
void MyScreenshotFunction::Screenshot()
{
HWND DesktopHwnd = ::GetDesktopWindow();
RECT DesktopParams;
HDC DevC = ::GetDC(DesktopHwnd);
::GetWindowRect(DesktopHwnd,&DesktopParams);
DWORD Width = DesktopParams.right - DesktopParams.left;
DWORD Height = DesktopParams.bottom - DesktopParams.top;
DWORD FileSize = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER)+(sizeof(RGBTRIPLE)+1*(Width*Height*4));
char *BmpFileData = (char*)GlobalAlloc(0x0040,FileSize);
PBITMAPFILEHEADER BFileHeader = (PBITMAPFILEHEADER)BmpFileData;
PBITMAPINFOHEADER BInfoHeader = (PBITMAPINFOHEADER)&BmpFileData[sizeof(BITMAPFILEHEADER)];
BFileHeader->bfType = 0x4D42; // BM
BFileHeader->bfSize = sizeof(BITMAPFILEHEADER);
BFileHeader->bfOffBits = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);
BITMAPINFO bmi;
ZeroMemory(&bmi, sizeof(BITMAPINFO));
bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi.bmiHeader.biWidth = Width;
bmi.bmiHeader.biHeight = Height;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 24;
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biSizeImage = bmi.bmiHeader.biWidth * abs(bmi.bmiHeader.biHeight) * 3;
unsigned char *BitsRGB=0;
HDC CaptureDC = CreateCompatibleDC(0);
HBITMAP CaptureBitmap = CreateDIBSection(DevC, &bmi, DIB_RGB_COLORS, (void**)&BitsRGB, NULL, 0);
SelectObject(CaptureDC,CaptureBitmap);
BitBlt(CaptureDC, 0, 0, Width, Height, DevC, 0, 0, SRCCOPY);
BITMAPFILEHEADER hdr; // bitmap file-header
hdr.bfType = 0x4d42; // 0x42 = "B" 0x4d = "M"
// Compute the size of the entire file.
hdr.bfSize = (DWORD) (sizeof(BITMAPFILEHEADER) + bmi.bmiHeader.biSize + bmi.bmiHeader.biClrUsed * sizeof(RGBQUAD) + bmi.bmiHeader.biSizeImage);
// Compute the offset to the array of color indices.
hdr.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) + bmi.bmiHeader.biSize + bmi.bmiHeader.biClrUsed * sizeof (RGBQUAD);
hdr.bfReserved1 = 0;
hdr.bfReserved2 = 0;
DWORD Junk;
HANDLE FH = CreateFile(_T("\Destination.bmp"),GENERIC_WRITE,FILE_SHARE_WRITE,0,CREATE_ALWAYS,0,0);
// Copy the BITMAPFILEHEADER into the .BMP file.
WriteFile(FH, (LPVOID) &hdr, sizeof(BITMAPFILEHEADER),(LPDWORD) &Junk, NULL);
// Copy the BITMAPINFOHEADER and RGBQUAD array into the file.
WriteFile(FH, (LPVOID) &(bmi.bmiHeader), sizeof(BITMAPINFOHEADER) + bmi.bmiHeader.biClrUsed * sizeof (RGBQUAD),
(LPDWORD) &Junk, ( NULL));
// Copy the array of color indices into the .BMP file.
WriteFile(FH, (LPSTR) BitsRGB, (int) bmi.bmiHeader.biSizeImage, (LPDWORD) &Junk,NULL);
CloseHandle(FH);
ReleaseDC(DesktopHwnd, DevC);
GlobalFree(BmpFileData);
}
这篇关于使用Win Ce6的屏幕截图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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