Introduction
This question is about a C++ code that is unable to display a bitmap. The code is from a textbook and is not working as expected. In this introduction, we will discuss the possible reasons why the code is not displaying the bitmap correctly. We will also discuss some possible solutions to the problem. By the end of this introduction, you should have a better understanding of why the code is not working and how to fix it.
Solution
The code provided in the textbook is incomplete and does not contain all the necessary components to display a bitmap. The code is missing the necessary Windows API calls to create a window, create a device context, and draw the bitmap. Additionally, the code does not contain any error handling code, which is necessary to ensure that the bitmap is displayed correctly. To fix the code, the following steps should be taken:
1. Add the necessary Windows API calls to create a window, create a device context, and draw the bitmap.
2. Add error handling code to ensure that the bitmap is displayed correctly.
3. Add code to free the memory allocated for the bitmap.
4. Add code to clean up any resources used by the program.
Running your code, put aside the code logic first, just to show the BMP image, you did not add the correct image path.
You can try to add the absolute path of the picture.
Like this:
DrawBitmap("C:\\Users\\strives\\source\\C.bmp",x,y); //This is my picture path. Please enter your picture path correctly.
Updated:
I retested the code with MinGW, GCC 4.9.2 compiler. It can display the image correctly. Look at my attached GIF picture.
From the results of your feedback later, Loadimage return NULL, you use GetLasterror to test the return value of 0. In theory, if the image failed to load, it will return 2. Maybe you can use int error = GetLasterror() to retest the return value. At the same time, you need to make sure that the BMP image you added is correct, opened, and in BMP format. picture
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solved Why the C++ code couldn’t display bitmap?(code from textbook) [closed]
If you are having trouble displaying a bitmap in your C++ code, there are a few potential causes. First, make sure that the bitmap file is in the correct format. Bitmap files must be in either .bmp or .dib format. If the file is in a different format, it will not be displayed correctly. Second, make sure that the code is correctly referencing the bitmap file. If the code is not referencing the correct file path, the bitmap will not be displayed. Finally, make sure that the code is correctly reading the bitmap file. If the code is not reading the file correctly, the bitmap will not be displayed.
If you are still having trouble displaying the bitmap, it may be helpful to review the code from the textbook. Make sure that all of the necessary functions are being called and that the parameters are being passed correctly. Additionally, make sure that the code is being compiled correctly. If the code is not being compiled correctly, the bitmap will not be displayed.
If you have reviewed the code and are still having trouble displaying the bitmap, it may be helpful to consult with a C++ expert. They may be able to identify the issue and provide a solution. Additionally, they may be able to provide additional resources or advice to help you troubleshoot the issue.