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| Acmlm's Board - I2 Archive - Programming - Dev-C++ and InvisibleBlt |
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RoboticParanoia Cheep-cheep Level: 23  Posts: 174/184 EXP: 60582 For next: 7141 Since: 03-23-04 From: Texas Since last post: 150 days Last activity: 150 days |
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| So, I recently bought a book on WinAPI32 programming with C++. I typed up the examples in the book, because I'm serious with this one. However, I can't get the compiler to compile a piece of code (a source code to handle bitmap loading) with TransparentBlt in it. I linked it to the msimg32 library file and to the gdi32 library as well. Basically, I get an error saying that TransparentBlt needed to be undeclared, even though it's cousin, BitBlt wasn't even mentioned in the code before it was used, with TransparentBlt. This is the exact error: "In member function 'void Bitmap:  raw(HDC_*, int, int, COLORREF)': TransparentBlt is undeclared (first use function). (Each undeclared identifier is only reported once for each function it appears in).The bad thing is that it's not even my code. I got it off the disc, because he didn't create a listing in the book on how to actually load the bitmap. I tried to compile it in Visual C++, but I got a bevy of errors and a few other things attatched (and it changed all my ;s to *s). So, right now, I included "wingdi.h" to a bunch of different files, and still nothing. So, anybody have any advice? I'd post the source code, but technically it's in eight different files and most of these are over 50 lines long. This is kinda frusterating, especially since the error is in their own source code. (edited by RoboticParanoia on 05-01-05 12:19 PM) |
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Parasyte Bullet Bill Level: 35  Posts: 487/514 EXP: 267348 For next: 12588 Since: 05-25-04 Since last post: 104 days Last activity: 32 days |
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| You should not implicitly link with the msimg32 or gdi32 libs. When you link the object files, the libs should be passed using the -l switch, like so: -lgdi32 -lmsimg32 But since you're compiling with an IDE, rather than the command line, you'll have to find out how to set it up from within the IDE. I cannot help in that regard, because I don't use any such IDEs. Other than that, it would probably help quite a bit to see an example of the source which is generating the error. The information you provided just is not enough to give an accurate answer. |
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RoboticParanoia Cheep-cheep Level: 23 Posts: 178/184 EXP: 60582 For next: 7141 Since: 03-23-04 From: Texas Since last post: 150 days Last activity: 150 days |
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| void Bitmap:raw(HDC hDC, int x, int y, BOOL bTrans, COLORREF crTransColor) { if (m_hBitmap != NULL) { // Create a memory device context for the bitmap HDC hMemDC = CreateCompatibleDC(hDC); // Select the bitmap into the device context HBITMAP hOldBitmap = (HBITMAP)SelectObject(hMemDC, m_hBitmap); // Draw the bitmap to the destination device context if (bTrans) TransparentBlt(hDC, x, y, GetWidth(), GetHeight(), hMemDC, 0, 0, GetWidth(), GetHeight(), crTransColor); else BitBlt(hDC, x, y, GetWidth(), GetHeight(), hMemDC, 0, 0, SRCCOPY); // Restore and delete the memory device context SelectObject(hMemDC, hOldBitmap); DeleteDC(hMemDC); } Here is where TransparantBlt is...but, now I get a Linker error, and it says it's an undefined reference...maybe I'm using it wrong or something. |
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sloat Level: 16 Posts: 46/85 EXP: 18044 For next: 2212 Since: 05-21-04 From: South Central Delaware Since last post: 19 days Last activity: 5 hours |
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| Before you include windows.h, try adding #define _WIN32_WINNT 0x0500 That tells the headers you're compiling for win2k. Really, it can just be defined as anything greater than 0x0400, but if I were you I would do everything in my power to discourage use of windows 9x. Also, that function has a well known memory leak on 95 and 98, and may not work very well at all. If you want something compatible across all versions of windows, check out this MSDN article. (edited by sloat on 05-01-05 01:56 PM) |
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RoboticParanoia Cheep-cheep Level: 23 Posts: 179/184 EXP: 60582 For next: 7141 Since: 03-23-04 From: Texas Since last post: 150 days Last activity: 150 days |
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| I'm going to try that fix...damn, I hope this works. |
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