我一直在制作反馈表，需要将数据记录到文本文件中。为此，我在 ANSI(?) C 编程(不是 C++ 和 C#)中使用 WIN32 (windows.h)，并使用 GNU 编译器编译 CODE::BLOCKS 中的代码。 我面临的问题是，我无法记录任何“编辑”子窗口的数据输入(第 15 行:HWND NAME、ROLLNO、CASE_REPORT)，以便每当用户按下“时，我都可以让消息框打印它们”保存文本”按钮。 我不知道如何在此处添加代码片段，因此我将整个有问题的代码粘贴到问题中。
#if defined(UNICODE) && !defined(_UNICODE)
#define _UNICODE
#elif defined(_UNICODE) && !defined(UNICODE)
#define UNICODE
#endif
#include <tchar.h>
#include <windows.h>
//Global Variables are declared here
#define ID_CANCEL 1
#define ID_SENDRPT 2
#define ID_SAVETXT 3
int WINWIDTH=460,WINHEIGHT=600; //Window Width and Window Height
HWND NAME,ROLLNO,CASE_REPORT,BTN_SEND,BTN_CANCEL,BTN_SAVE; //Declaring names of various elements
HWND NAME_LABEL,ROLLNO_LABEL,LABEL_WARNING,LABEL_CASE_REPORT,LABEL_EMAIL_INFO; //for our application
int _inputy=20,_rollnoy=_inputy+21,_case_report_y=_rollnoy+21; //Position information for our elements
/*Declaration of User Defined Functions*/
void AGIMIX_MB_INFO(HWND hwnd,const char *_title,const char *_message);
void AGIMIX_MB_ERROR(HWND hend, const char *_title, const char *_message);
void AGIMIX_USR_INPUT(HWND hnd,HWND hwnd, const char *_default_text,int _xpos,int _ypos,int _length,int _ht);
void AGIMIX_PUT_TXT(HWND hnd,HWND hwnd, const char *_text,int _xpos,int _ypos,int _length,int _ht);
void AGIMIX_PUT_BUTTON(HWND hnd,HWND hwnd,HMENU _identify, const char *_text,int _xpos,int _ypos,int _length,int _ht);
void AGIMIX_USER_TXTFIELD(HWND hnd,HWND hwnd, const char *_text,int _xpos,int _ypos,int _length,int _ht);
/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
/* Make the class name into a global variable */
TCHAR szClassName[ ] = _T("AGIMIX_WINDOWS_APP_FEEDBACK");
char *input_name;
int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nCmdShow)
{
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */
/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = CS_DBLCLKS; /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);
/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Use Windows's default colour as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND+5;
/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0;
/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilities for variation */
szClassName, /* Class name */
_T("AGIMIX FEEDBACK FORM"), /* Title Text */
WS_OVERLAPPED|WS_SYSMENU, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
WINWIDTH, /* The programs width */
WINHEIGHT, /* and height in pixels */
HWND_DESKTOP, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);
/* Make the window visible on the screen */
ShowWindow (hwnd, nCmdShow);
/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}
/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}
/* This function is called by the Windows function DispatchMessage() */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages */
{
case WM_CREATE: //What to do when the application window is created
AGIMIX_MB_INFO(hwnd,"AGIMIX [INFORMATION]","Welcome"); //Welcome user with a Message Box
AGIMIX_MB_ERROR(hwnd,"AGIMIX [WARNING: TRIAL VERSION]","This is a Educational / Trial version only, No functionality is supported!"); //Warn user about limited functionality
AGIMIX_PUT_TXT(LABEL_WARNING,hwnd," All fields marked with \' * \' are compulsory",0,0,450,19); //STATIC type to Warn user about compulsory fields to be filled
AGIMIX_PUT_TXT(NAME_LABEL,hwnd," NAME (FULL CAPS)*: ",0,_inputy,150,20); //STATIC type to prompt user for his Name in Full Capital letters
AGIMIX_USR_INPUT(NAME,hwnd,"",150,_inputy,300,20); //EDIT type text-field to take input from user
AGIMIX_PUT_TXT(ROLLNO_LABEL,hwnd," LICENCE NUMBER*: ",0,_rollnoy,150,20); //STATIC type to prompt user for his Licence Number
AGIMIX_USR_INPUT(ROLLNO,hwnd,"",150,_rollnoy,300,20); //EDIT type text-field to take input from user
AGIMIX_PUT_TXT(LABEL_CASE_REPORT,hwnd," FEEDBACK / COMPLAINT*: ",0,_case_report_y,450,20); //STATIC type to prompt user for his complaint / feedback information
AGIMIX_USER_TXTFIELD(CASE_REPORT,hwnd,"",0,_case_report_y+21,450,350); //EDIT type text-field with added functionality of Multi-line input and Scrolling for inputting detail feedback / complaint
AGIMIX_PUT_TXT(LABEL_EMAIL_INFO,hwnd," Feedback will be responded to Registered Email with Licence.",0,_case_report_y+380,450,21); //STATIC type to warn user about preregistered email response to the complaint
AGIMIX_PUT_BUTTON(BTN_SEND,hwnd,(HMENU)ID_SENDRPT,"SEND",50,_case_report_y+430,100,50); //BUTTON type input for Sending information to AGIMIX server
AGIMIX_PUT_BUTTON(BTN_SAVE,hwnd,(HMENU)ID_SAVETXT,"SAVE TXT",170,_case_report_y+430,100,50); //BUTTON type input for Saving the information in a (.txt) file
AGIMIX_PUT_BUTTON(BTN_CANCEL,hwnd,(HMENU)ID_CANCEL,"CANCEL && EXIT",290,_case_report_y+430,105,50); //BUTTON type input to Cancel the current complaint/feedback and exit the window/application
//3 GetWindowText(NAME,input_name,50);
break;
case WM_COMMAND:
//TCHAR input_name[100];
if(LOWORD(wParam) == ID_CANCEL)
{
AGIMIX_MB_ERROR(hwnd,"AGIMIX [WARNING: TRIAL VERSION]","This is a Educational / Trial version only, No functionality is supported!"); //Warn user about limited functionality
AGIMIX_MB_INFO(hwnd,"AGIMIX [INFORMATION]","Exit Success! Bye."); //Give user a parting Message
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
}
if(LOWORD(wParam) == ID_SENDRPT)
{
AGIMIX_MB_INFO(hwnd,"AGIMIX [FUNCTION SUPPORT]","Function is not supported as of now and will be available later!");
}
if(LOWORD(wParam) == ID_SAVETXT)
{
GetWindowText(NAME,input_name,50);
AGIMIX_MB_INFO(hwnd,input_name,input_name);
SetWindowText(hwnd,input_name);
AGIMIX_MB_INFO(hwnd,"AGIMIX [ENTERED INFO]",input_name);
AGIMIX_MB_INFO(hwnd,"AGIMIX [FUNCTION SUPPORT]","Function is not supported as of now and will be available later!");
}
break;
case WM_DESTROY: //What to do when the user exits the application
AGIMIX_MB_ERROR(hwnd,"AGIMIX [WARNING: TRIAL VERSION]","This is a Educational / Trial version only, No functionality is supported!"); //Warn user about limited functionality
AGIMIX_MB_INFO(hwnd,"AGIMIX [INFORMATION]","Exit Success! Bye."); //Give user a parting Message
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;
default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;
}
// User Defined Functions for easy functionality
void AGIMIX_MB_INFO(HWND hwnd,const char *_title,const char *_message)
{
MessageBox(hwnd,_message,_title,MB_ICONINFORMATION|MB_OK);
}
void AGIMIX_MB_ERROR(HWND hwnd, const char *_title, const char *_message)
{
MessageBox(hwnd,_message,_title,MB_ICONERROR|MB_OK);
}
void AGIMIX_USR_INPUT(HWND hnd,HWND hwnd, const char *_default_text,int _xpos,int _ypos,int _length,int _ht)
{
hnd = CreateWindow("EDIT",_default_text,WS_VISIBLE|WS_CHILD|WS_BORDER,_xpos,_ypos,_length,_ht,hwnd,NULL,NULL,NULL);
}
void AGIMIX_PUT_TXT(HWND hnd,HWND hwnd, const char *_text,int _xpos,int _ypos,int _length,int _ht)
{
hnd = CreateWindow("STATIC",_text,WS_VISIBLE|WS_CHILD,_xpos,_ypos,_length,_ht,hwnd,NULL,NULL,NULL);
}
void AGIMIX_USER_TXTFIELD(HWND hnd,HWND hwnd, const char *_text,int _xpos,int _ypos,int _length,int _ht)
{
hnd = CreateWindow("EDIT",_text,WS_VISIBLE|WS_CHILD|WS_BORDER|ES_MULTILINE|ES_AUTOVSCROLL|WS_VSCROLL,_xpos,_ypos,_length,_ht,hwnd,NULL,NULL,NULL);
}
void AGIMIX_PUT_BUTTON(HWND hnd,HWND hwnd,HMENU _identify, const char *_text,int _xpos,int _ypos,int _length,int _ht)
{
hnd = CreateWindow("BUTTON",_text,WS_VISIBLE|WS_CHILD|WS_BORDER,_xpos,_ypos,_length,_ht,hwnd,_identify,NULL,NULL);
}
基本上，每当用户按下任何“SEND”或“SAVETXT”按钮时，“NAME”、“ROLLNO”和“CASE_REPORT”窗口中的内容都应记录在 char *input_name (LINE 31) 变量中) 用于进一步处理，例如 MessageBox() 或保存 txt 文件。
最佳答案
您的代码中有几个问题:
input_name是一个从未初始化过的指针，因此它指向任何地方。您应该使用TCHAR input_name[100];或类似的内容。- 在
AGIMIX_USR_INPUT中修改hnd是没有意义的，参数在 C 中按值传递。相反，您应该返回创建的窗口句柄，见下文
更正了 AGIMIX_USR_INPUT 函数
HWND AGIMIX_USR_INPUT(HWND hwnd, const char *_default_text, int _xpos, int _ypos, int _length, int _ht)
{
return CreateWindow("EDIT", _default_text, WS_VISIBLE | WS_CHILD | WS_BORDER, _xpos, _ypos, _length, _ht, hwnd, NULL, NULL, NULL);
}
这样调用它:
NAME = AGIMIX_USR_INPUT(hwnd, "", 150, _inputy, 300, 20);
这对于其他类似的 AGIMIX_ 函数也是有效的。
调用GetWindowText喜欢这样:
GetWindowText(NAME, input_name, _countof(input_name));
其他几点:
- 您不应使用全部大写的标识符。只有宏才应该全部大写。这是 C 语言的约定。
- 您应该将代码分解为几个更简单的函数。
- 您混淆了
TCHAR和char。如果您以 ANSI 模式编译您的程序，则它可以运行，但它甚至无法以 UNICODE 模式编译。 - 您应该正确设置变量声明的格式，现在一团糟。
关于c - GetWindowText() 函数未从 INPUT ("EDIT"类型窗口获取/输出任何文本)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54363002/