LoadBitmap returns NULL
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I want to display a JPEG file at the picture control. I created a memory variable m_hBitmap at the CDialog class and have the interface to process the following code when the Open button is clicked. But line #2 always returns NULL. CString file_name = "c:\\gis\\aspjpeg\\root.jpeg"; //line #1 m_hBitmap = (HBITMAP)::LoadBitmap(NULL, file_name); //line #2 m_thumbnail.SetBitmap(m_hBitmap); //line #3 Elizabeth
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I want to display a JPEG file at the picture control. I created a memory variable m_hBitmap at the CDialog class and have the interface to process the following code when the Open button is clicked. But line #2 always returns NULL. CString file_name = "c:\\gis\\aspjpeg\\root.jpeg"; //line #1 m_hBitmap = (HBITMAP)::LoadBitmap(NULL, file_name); //line #2 m_thumbnail.SetBitmap(m_hBitmap); //line #3 Elizabeth
are you sure
LoadBitmapcan load jpg files ?
Maximilien Lincourt "Never underestimate the bandwidth of a station wagon filled with backup tapes." ("Computer Networks" by Andrew S Tannenbaum )
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I want to display a JPEG file at the picture control. I created a memory variable m_hBitmap at the CDialog class and have the interface to process the following code when the Open button is clicked. But line #2 always returns NULL. CString file_name = "c:\\gis\\aspjpeg\\root.jpeg"; //line #1 m_hBitmap = (HBITMAP)::LoadBitmap(NULL, file_name); //line #2 m_thumbnail.SetBitmap(m_hBitmap); //line #3 Elizabeth
Are you sure that the first parameter to
LoadBitmap()can be NULL? The docs do not indicate such. Have you checked the return value ofGetLastError()? That might tell you exactly what is happening! I suspect Max's comment is more in line with what is happening.
Five birds are sitting on a fence. Three of them decide to fly off. How many are left?
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Are you sure that the first parameter to
LoadBitmap()can be NULL? The docs do not indicate such. Have you checked the return value ofGetLastError()? That might tell you exactly what is happening! I suspect Max's comment is more in line with what is happening.
Five birds are sitting on a fence. Three of them decide to fly off. How many are left?
I tried openning a bitmap file, but still getting a NULl return. Here is the updated code: CString file_name = "c:\\gis\\aspjpeg\\new_file.bmp"; //line #1 m_hBitmap = (HBITMAP)::LoadBitmap(NULL, file_name); //line #2 DWORD error = GetLastError(); The error code is 1814 which is resource file not found. Elizabeth
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I tried openning a bitmap file, but still getting a NULl return. Here is the updated code: CString file_name = "c:\\gis\\aspjpeg\\new_file.bmp"; //line #1 m_hBitmap = (HBITMAP)::LoadBitmap(NULL, file_name); //line #2 DWORD error = GetLastError(); The error code is 1814 which is resource file not found. Elizabeth
ElizabethC wrote: The error code is 1814 which is resource file not found. Of course, because a resource named "c:\\gis\\aspjpeg\\new_file.bmp" does not exist in a module having an instance handle of 0. You need to use a non-NULL instance handle, and the specified bitmap should not contain any path information. I think you need to use
LoadImage()instead.
Five birds are sitting on a fence. Three of them decide to fly off. How many are left?
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ElizabethC wrote: The error code is 1814 which is resource file not found. Of course, because a resource named "c:\\gis\\aspjpeg\\new_file.bmp" does not exist in a module having an instance handle of 0. You need to use a non-NULL instance handle, and the specified bitmap should not contain any path information. I think you need to use
LoadImage()instead.
Five birds are sitting on a fence. Three of them decide to fly off. How many are left?
I have just looked up LoadImage(). It also requires a instance handle. Can you suggest what HINSTANCE should I use in a CDialog class? The picture will be displayed at the picture control which is a CStatic control. Elizabeth
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I have just looked up LoadImage(). It also requires a instance handle. Can you suggest what HINSTANCE should I use in a CDialog class? The picture will be displayed at the picture control which is a CStatic control. Elizabeth
ElizabethC wrote: It also requires a instance handle. Which can be 0.
Five birds are sitting on a fence. Three of them decide to fly off. How many are left?
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ElizabethC wrote: It also requires a instance handle. Which can be 0.
Five birds are sitting on a fence. Three of them decide to fly off. How many are left?
I got it working with the bitmap file with the return handle: CString file_name = "c:\\gis\\aspjpeg\\file_new.bmp"; m_hBitmap = (HBITMAP)LoadImage(NULL, file_name, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); DWORD error = GetLastError(); However, it the handle is NULL when loading a JPEG file: CString file_name = "c:\\gis\\aspjpeg\\root.jpeg"; // CString file_name = "c:\\gis\\aspjpeg\\file_new.bmp"; //line #1 m_hBitmap = (HBITMAP)LoadImage(NULL, file_name, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); DWORD error = GetLastError(); Do you know how to load a JPEG file into the picture control? Elizabeth
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I got it working with the bitmap file with the return handle: CString file_name = "c:\\gis\\aspjpeg\\file_new.bmp"; m_hBitmap = (HBITMAP)LoadImage(NULL, file_name, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); DWORD error = GetLastError(); However, it the handle is NULL when loading a JPEG file: CString file_name = "c:\\gis\\aspjpeg\\root.jpeg"; // CString file_name = "c:\\gis\\aspjpeg\\file_new.bmp"; //line #1 m_hBitmap = (HBITMAP)LoadImage(NULL, file_name, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); DWORD error = GetLastError(); Do you know how to load a JPEG file into the picture control? Elizabeth
ElizabethC wrote: Do you know how to load a JPEG file into the picture control? Use GDIPlus::Bitmap class Use IPicture and ::OleLoadPicture() or OleLoadPicturePath() functions.
[
](http://www.canucks.com)Sonork 100.11743 Chicken Little "You're obviously a superstar." - Christian Graus about me - 12 Feb '03 Within you lies the power for good - Use it!
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I got it working with the bitmap file with the return handle: CString file_name = "c:\\gis\\aspjpeg\\file_new.bmp"; m_hBitmap = (HBITMAP)LoadImage(NULL, file_name, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); DWORD error = GetLastError(); However, it the handle is NULL when loading a JPEG file: CString file_name = "c:\\gis\\aspjpeg\\root.jpeg"; // CString file_name = "c:\\gis\\aspjpeg\\file_new.bmp"; //line #1 m_hBitmap = (HBITMAP)LoadImage(NULL, file_name, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE); DWORD error = GetLastError(); Do you know how to load a JPEG file into the picture control? Elizabeth
ElizabethC wrote: However, it the handle is NULL when loading a JPEG file: Maybe it's not designed to work with non-BMP images.
Five birds are sitting on a fence. Three of them decide to fly off. How many are left?