在一个简单的WINAPI程序中，我正在创建一个对话框（我用ResEdit创建）。
但是，对话框未显示，DialogBox()调用返回-1。 GetLastError()返回1812（指定的图像文件不包含资源部分。）
的main.cpp
/*default stuff, like including windows.h, etc... */
int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nCmdShow)
{
hInst = hThisInstance;
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 */
/*default stuff, initializing fields of WNDCLASSEX struct */
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
_T("Hello World"), /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
544, /* The programs width */
375, /* and height in pixels */
0, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);
/* Creating controls ... */
/* Make the window visible on the screen */
ShowWindow (hwnd, nCmdShow);
/* Default : message loop. It will run until GetMessage() returns 0 */
/* 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:
HMENU hMenu, hSubMenu;
HICON hIcon, hIconSm;
hMenu = CreateMenu();
hSubMenu = CreatePopupMenu();
AppendMenu(hSubMenu, MF_STRING, ID_FILE_EXIT, "E&xit");
AppendMenu(hMenu, MF_STRING | MF_POPUP, (UINT) hSubMenu, "&File");
hSubMenu = CreatePopupMenu();
AppendMenu(hSubMenu, MF_STRING, ID_HELP_ABT, "&About");
AppendMenu(hMenu, MF_STRING | MF_POPUP, (UINT) hSubMenu, "&Help");
SetMenu(hwnd, hMenu);
hIcon = (HICON) LoadImage(NULL, "iconBIG.ico", IMAGE_ICON, 32, 32, LR_LOADFROMFILE);
if (hIcon)
SendMessage(hwnd, WM_SETICON, ICON_BIG, (LPARAM) hIcon);
hIconSm = (HICON) LoadImage(NULL, "iconSMALL.ico", IMAGE_ICON, 16, 16, LR_LOADFROMFILE);
if (hIconSm)
SendMessage(hwnd, WM_SETICON, ICON_SMALL, (LPARAM) hIconSm);
break;
case WM_DESTROY:
PostQuitMessage(0); /* send a WM_QUIT to the message queue */
break;
case WM_COMMAND:
switch (LOWORD(wParam)) {
case IDC_ACCEPTBTN:
/* handling the controls */
break;
case ID_FILE_EXIT:
/* handling more controls ... */
PostQuitMessage(0);
break;
case ID_HELP_ABT:
int ret = DialogBox(GetModuleHandle, MAKEINTRESOURCE(IDD_DIALOG1), hwnd, myDialog);
/*PROBLEM: DialogBox returns -1*/
if (ret == -1) {
DWORD dw = GetLastError(); // error 1812
char buffer[70];
sprintf(buffer, "Failed with %d", dw);
MessageBox(hwnd, buffer, "", MB_OK);
}
break;
}
break;
default:
return DefWindowProc(hwnd, message, wParam, lParam);
}
return 0;
}
BOOL CALLBACK myDialog(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg) {
case WM_INITDIALOG:
return TRUE;
case WM_COMMAND:
switch (LOWORD(wParam)) {
case IDOK:
EndDialog(hwnd, IDOK);
break;
case IDCANCEL:
EndDialog(hwnd, IDCANCEL);
break;
}
break;
default: return FALSE;
}
}
resourceDialog.rc
#include <windows.h>
#include <commctrl.h>
#include <richedit.h>
#include "resource.h"
LANGUAGE 0, SUBLANG_NEUTRAL
IDD_DIALOG1 DIALOG 0, 0, 186, 95
STYLE DS_3DLOOK | DS_CENTER | DS_MODALFRAME | DS_SHELLFONT | WS_CAPTION | WS_VISIBLE | WS_POPUP | WS_SYSMENU
CAPTION "Dialog"
FONT 8, "Ms Shell Dlg"
{
GROUPBOX "Static", 0, 3, 7, 118, 82, 0, WS_EX_LEFT
LTEXT "hello,\nworld!", 0, 16, 21, 20, 17, SS_LEFT, WS_EX_LEFT
PUSHBUTTON "Cancel", IDCANCEL, 129, 24, 50, 14, 0, WS_EX_LEFT
DEFPUSHBUTTON "OK", IDOK, 129, 7, 50, 14, 0, WS_EX_LEFT
}
RESOURCE.H
#ifndef IDC_STATIC
#define IDC_STATIC (-1)
#endif
#define IDD_DIALOG1 100
/* Dont redefine IDOK and IDCANCEL */
/*#define IDOK 40000
#define IDCANCEL 40001*/
为什么对话框不显示？我正在关注winprog.org的教程并按照他们的说法进行操作。
Ide：代码块 编译：GCC
答案 0 :(得分：1)
GetModuleHandle是一个功能。您无法将函数的名称传递给HINSTANCE的{{1}}参数，并希望它能够正常工作。事实上，即使编译我也很惊讶！为当前可执行文件调用它的正确方法是DialogBox()。
但是有更好的方法：GetModuleHandle(NULL)的第一个参数也是可执行文件的WinMain()。只需将其存储在全局变量中，然后直接使用它。
在包含HINSTANCE 之前添加以下行有助于捕获此类错误：
<windows.h>答案 1 :(得分：1)
这是编辑后main.cpp的内容。我仍然不知道你的问题是什么 - 你可以将这个文件与你自己的文件进行比较，以便为自己推断，我希望如此。 ：）
您可能还需要删除用于类注册的结构中的图标引用，因为您在WM_CREATE中设置它
/*
These are the steps I took.
1. Add this to the code:
#if defined(UNICODE) && !defined(_UNICODE)
#define _UNICODE
#elif defined(_UNICODE) && !defined(UNICODE)
#define UNICODE
#endif
#include <tchar.h>
#include <windows.h>
#include <cstdio>
#include "resource.h"
HINSTANCE hInst;
TCHAR *szClassName = _T("mClassName");
#define ID_FILE_EXIT 40001
#define IDC_ACCEPTBTN 40002
#define ID_HELP_ABT 40003
BOOL CALLBACK myDialog(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);
2. Change
this: int ret = DialogBox(GetModuleHandle, MAKEINTRESOURCE(IDD_DIALOG1), hwnd, myDialog);
to
this: int ret = DialogBox(hInst, MAKEINTRESOURCE(IDD_DIALOG1), hwnd, myDialog);
3. Add the message loop back in.
UpdateWindow(hwnd);
// 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;
4. Change the ShowWindow command to this (i.e ignore the nCmdShow var passed to main by the OS
ShowWindow (hwnd, SW_SHOWNORMAL);
5. Add in class registration stuff:
WNDCLASSEX WndClsEx;
WndClsEx.cbSize = sizeof(WNDCLASSEX);
WndClsEx.style = CS_HREDRAW | CS_VREDRAW;
WndClsEx.lpfnWndProc = WindowProcedure;
WndClsEx.cbClsExtra = 0;
WndClsEx.cbWndExtra = 0;
WndClsEx.hIcon = LoadIcon(NULL, IDI_APPLICATION);
WndClsEx.hCursor = LoadCursor(NULL, IDC_ARROW);
WndClsEx.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
WndClsEx.lpszMenuName = NULL;
WndClsEx.lpszClassName = szClassName;
WndClsEx.hInstance = hInst;
WndClsEx.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
// Register the window class, and if it fails quit the program
RegisterClassEx(&WndClsEx);
6. Add WindowProcedure forward declaration
*/
#if defined(UNICODE) && !defined(_UNICODE)
#define _UNICODE
#elif defined(_UNICODE) && !defined(UNICODE)
#define UNICODE
#endif
#include <tchar.h>
#include <windows.h>
#include <cstdio>
#include "resource.h"
HINSTANCE hInst;
TCHAR *szClassName = _T("mClassName");
#define ID_FILE_EXIT 40001
#define IDC_ACCEPTBTN 40002
#define ID_HELP_ABT 40003
BOOL CALLBACK myDialog(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);
LRESULT CALLBACK WindowProcedure(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
/*default stuff, like including windows.h, etc... */
int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nCmdShow)
{
hInst = hThisInstance;
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 */
/*default stuff, initializing fields of WNDCLASSEX struct */
WNDCLASSEX WndClsEx;
WndClsEx.cbSize = sizeof(WNDCLASSEX);
WndClsEx.style = CS_HREDRAW | CS_VREDRAW;
WndClsEx.lpfnWndProc = WindowProcedure;
WndClsEx.cbClsExtra = 0;
WndClsEx.cbWndExtra = 0;
WndClsEx.hIcon = LoadIcon(NULL, IDI_APPLICATION);
WndClsEx.hCursor = LoadCursor(NULL, IDC_ARROW);
WndClsEx.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
WndClsEx.lpszMenuName = NULL;
WndClsEx.lpszClassName = szClassName;
WndClsEx.hInstance = hInst;
WndClsEx.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
/* Register the window class, and if it fails quit the program */
RegisterClassEx(&WndClsEx);
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
_T("Hello World"), /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
544, /* The programs width */
375, /* and height in pixels */
0, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);
/* Creating controls ... */
/* Make the window visible on the screen */
ShowWindow (hwnd, SW_SHOWNORMAL);
/* Default : message loop. It will run until GetMessage() returns 0 */
UpdateWindow(hwnd);
/* 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:
HMENU hMenu, hSubMenu;
HICON hIcon, hIconSm;
hMenu = CreateMenu();
hSubMenu = CreatePopupMenu();
AppendMenu(hSubMenu, MF_STRING, ID_FILE_EXIT, "E&xit");
AppendMenu(hMenu, MF_STRING | MF_POPUP, (UINT) hSubMenu, "&File");
hSubMenu = CreatePopupMenu();
AppendMenu(hSubMenu, MF_STRING, ID_HELP_ABT, "&About");
AppendMenu(hMenu, MF_STRING | MF_POPUP, (UINT) hSubMenu, "&Help");
SetMenu(hwnd, hMenu);
hIcon = (HICON) LoadImage(NULL, "iconBIG.ico", IMAGE_ICON, 32, 32, LR_LOADFROMFILE);
if (hIcon)
SendMessage(hwnd, WM_SETICON, ICON_BIG, (LPARAM) hIcon);
hIconSm = (HICON) LoadImage(NULL, "iconSMALL.ico", IMAGE_ICON, 16, 16, LR_LOADFROMFILE);
if (hIconSm)
SendMessage(hwnd, WM_SETICON, ICON_SMALL, (LPARAM) hIconSm);
break;
case WM_DESTROY:
PostQuitMessage(0); /* send a WM_QUIT to the message queue */
break;
case WM_COMMAND:
switch (LOWORD(wParam))
{
case IDC_ACCEPTBTN:
/* handling the controls */
break;
case ID_FILE_EXIT:
/* handling more controls ... */
PostQuitMessage(0);
break;
case ID_HELP_ABT:
int ret = DialogBox(hInst, MAKEINTRESOURCE(IDD_DIALOG1), hwnd, myDialog);
/*PROBLEM: DialogBox returns -1*/
if (ret == -1)
{
DWORD dw = GetLastError(); // error 1812
char buffer[70];
sprintf(buffer, "Failed with %d", dw);
MessageBox(hwnd, buffer, "", MB_OK);
}
break;
}
break;
default:
return DefWindowProc(hwnd, message, wParam, lParam);
}
return 0;
}
BOOL CALLBACK myDialog(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_INITDIALOG:
return TRUE;
case WM_COMMAND:
switch (LOWORD(wParam))
{
case IDOK:
EndDialog(hwnd, IDOK);
break;
case IDCANCEL:
EndDialog(hwnd, IDCANCEL);
break;
}
break;
default:
return FALSE;
}
}