Hi, I save bmp file by two ways. First: windows handle method, Second: ALLEGRO_FILE, and there are some differences. Why?
Windows handle:
{"name":"122.png","src":"\/\/djungxnpq2nug.cloudfront.net\/image\/cache\/3\/9\/394edc1e2178f0ba867142a3ed969b06.png","w":1440,"h":900,"tn":"\/\/djungxnpq2nug.cloudfront.net\/image\/cache\/3\/9\/394edc1e2178f0ba867142a3ed969b06"}
ALLEGRO_FILE:
{"name":"123.png","src":"\/\/djungxnpq2nug.cloudfront.net\/image\/cache\/e\/9\/e90ea36612f6db405cdf6312b19faa19.png","w":1440,"h":900,"tn":"\/\/djungxnpq2nug.cloudfront.net\/image\/cache\/e\/9\/e90ea36612f6db405cdf6312b19faa19"}
Why ALLEGRO_FILE method saved crap file?
code:
1void C_Tools::hwndToBitmap(HWND hwnd)
2{
3 BITMAPFILEHEADER bmfh = {0};
4 BITMAPINFOHEADER bmih = {0};
5 RECT rc = {0};
6 HDC hdc1;
7 HDC hdc2;
8 HBITMAP aBmp;
9 BITMAPINFO bi;
10 HGDIOBJ OldObj;
11 void *dibvalues;
12 HANDLE fileHandle;
13 DWORD bytes_written;
14 int w;
15 int h;
16
17 hdc1 = GetWindowDC(hwnd);
18 hdc2 = CreateCompatibleDC(hdc1);
19 GetWindowRect(hwnd, &rc);
20 w = rc.right-rc.left;
21 h = rc.bottom-rc.top;
22
23 bmih.biSize = sizeof(BITMAPINFOHEADER);
24 bmih.biWidth = w;
25 bmih.biHeight = h;
26 bmih.biPlanes = 1;
27 bmih.biBitCount = 24;
28 bmih.biCompression = BI_RGB;
29 bmih.biSizeImage = ((((bmih.biWidth * bmih.biBitCount) + 31) & ~31) >> 3) * bmih.biHeight;
30 bi.bmiHeader = bmih;
31
32 aBmp = CreateDIBSection(hdc1, &bi ,DIB_RGB_COLORS, (void**)&dibvalues, NULL, NULL);
33 OldObj = SelectObject(hdc2, aBmp);
34 BitBlt(hdc2, 0, 0, w, h, hdc1, 0, 0, SRCCOPY);
35 bmfh.bfOffBits = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);
36 bmfh.bfSize = (3*bmih.biHeight*bmih.biWidth)+sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFOHEADER);
37 bmfh.bfType = 0x4d42;
38
39 fileHandle = CreateFile(L"aaa.bmp", GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
40 ALLEGRO_FILE* file = al_fopen("aaa2.bmp","w");
41
42 WriteFile(fileHandle, &bmfh, sizeof(BITMAPFILEHEADER), &bytes_written, NULL);
43 al_fwrite(file, &bmfh, sizeof(BITMAPFILEHEADER));
44
45 WriteFile(fileHandle, &bmih, sizeof(BITMAPINFOHEADER), &bytes_written, NULL);
46 al_fwrite(file, &bmih, sizeof(BITMAPINFOHEADER));
47
48 WriteFile(fileHandle, (void*)dibvalues, bmih.biSizeImage, &bytes_written, NULL);
49 al_fwrite(file, (void*)dibvalues, bmih.biSizeImage);
50
51 al_fclose(file);
52 CloseHandle(fileHandle);
53
54 DeleteObject(SelectObject(hdc2,OldObj));
55 DeleteDC(hdc2);
56 ReleaseDC(hwnd, hdc1);
57}
]]>
