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holylove jewelry wholesale DLL file (Dynamic Linkable Library is a dynamic link library file), which is a file that cannot be run alone. These modules have completed relatively independent functions, and they cooperate with each other to complete the work of the entire software system. Some modules may be more universal, and they are still used when constructing other software systems. When constructing a software system, if the source code of all modules is static to the entire application EXE file, some problems will occur: one disadvantage is to increase the size of the application, it will occupy more disk space, program operation running It will also consume a large memory space, causing waste of system resources; another disadvantage is that when writing a large EXE program, every time you modify and reconstruction, you must adjust the compilation of all source code, which increases the complexity of the compilation process. It is also not conducive to staged unit tests.
The Windows system platform provides a completely different effective programming and operating environment. You can create an independent program module into a smaller DLL file and compile and test them separately. When running, only when the EXE program does call these DLL modules can the system load them into memory space. This method not only reduces the size of the EXE file and the demand for memory space, but also allows these DLL modules to be used by multiple applications at the same time. Windows itself implements some major system functions in the form of DLL modules.
In general, DLL is a disk file that uses .dll, .drv, .fon, .sys, and many system files that expanded .exe could be DLL. It consists of global data, service functions, and resources. It is loaded by the system to the virtual space of the call process by the system at runtime and becomes part of the call process. If there is no conflict with other DLLs, the file is usually mapped to the same address of the process virtual space. The DLL module contains various export functions to provide services to the outside world. DLL can have its own data segment, but without its own stack, use the same stack mode as the application that calls it; a DLL has only one instance in memory; DLL realizes code packaging; DLL preparation and specific programming language It has nothing to do with the compiler.
In the Win32 environment, each process copys its own read/write global variables. If you want to share memory with other processes, you must use memory mapping files or declare a shared data segment. The stack memory required by the DLL module is allocated from the stack of the running process. When loading the DLL module, Windows calls the process function to match the export function of the DLL file. The operation of the Windows operating system for DLL is just mapped to the virtual address space of the process that requires it. Any object (including variables) created by the code in the DLL function calls its thread or process ownership.
Calling method:
1. Static call method: The encoding of DLL uninstalled by the compile system to complete the loading of DLL and the end of the application (if there are other programs using the DLL, then Windows's application of DLL to DLL The record was reduced by 1 until all related procedures were released when the DLL was used. It was simple and practical, but it was not flexible enough to meet the general requirements.
When the .lib file is added to the application project, when you want to use the function in the DLL, you only need to explain it. Invisible call does not require calling () and (). Generate a corresponding LIB import file. This file contains the symbol name and optional identification number of each DLL export function, but does not contain the actual code. .
When the programmer compiles the application through a static link, the call function in the application matches the export symbol in the lib file. Including the corresponding DL L file name (but not a complete path name), the link program is stored inside the EXE file.
When the application needs to be loaded during the application of the application DLL, and then dynamic links to the DLL function through the symbol name or identification number. All DLL files called by the application will be loaded in memory when the application exe file is loaded. The input library file (.lib file) of the information. The operating system loads DLL when loading the executable program. The executable program can directly call the output function of the DLL through the function name. The call method and other functions inside the program are the same.
. Dynamic calling method: It is an important way to use the API function to load and uninstall the DLL by the API function to achieve the purpose of calling DLL. R n -explicitly calls:
refers to the dynamic connection library made by using or MFC in the application or MFC. The file name of the dynamic connection library is Parameters, then use () to obtain the function you want to introduce. Since then, you can call the function like a function customized like this application. Before the application exits, it should be released with or MFC. Dynamic connection library. Call the function of win32 directly and specify the path of the DLL as a parameter. Return to Hinsta NCE parameter, the application uses this parameter when calling the function. The function converts the symbol name or identification number to the address inside DLL. The programmer can decide when the DLL file is loaded or not loaded, and the explicit link determines which DLL file is loaded during runtime. The DLL program must load () load () to load the DLL to obtain the handle of a DLL module before using, and then call the function to get the pointer of the output function. You must uninstall the DLL () before exiting.
Because DLL has small memory, good editors, etc. There are many computer viruses in DLL format files. But you cannot run alone.
D dynamic link library can usually not run directly or receive messages. They are some independent files that contain functions that can be executed or other DLL calls to complete a job. It can only play a role when calling the function in the dynamic link library in other modules.