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report windows error message

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This commit is contained in:
interfiberschool 2023-03-17 12:42:47 +00:00
parent 9798f880f9
commit d0f3f64bf8
4 changed files with 90 additions and 30 deletions
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11
examples/unix/main.c
View file

@ -2,11 +2,12 @@
typedef void (*func_handle)();
int main()
{
struct hotwire_dll_t dll = hw_dlopen("./bin/exampleUnixLib.dll", RTLD_NOW);
int main() {
struct hotwire_dll_t dll = hw_dlopen("./bin/exampleUnixLib.dll", RTLD_NOW);
func_handle func = (func_handle)hw_dlsym(dll, "test");
func_handle func = (func_handle)hw_dlsym(dll, "test");
func();
func();
hw_dlclose(dll);
}

2
examples/win/main.c
View file

@ -9,4 +9,6 @@ int main()
func_handle func = (func_handle)hw_dlsym(dll, "test");
func();
hw_dlclose(dll);
}

77
src/dlopen.c
View file

@ -9,9 +9,9 @@ struct hotwire_dll_t hw_dlopen(const char *file, int flags) {
#if defined(__linux__) || defined(__APPLE__)
dll.dll_handle = dlopen(file, flags);
if (dll.dll_handle == NULL){
printf("could not load dll(UNIX api call returned error)\n");
printf("error message: %s\n", dlerror());
if (dll.dll_handle == NULL) {
printf("Could not load dll(UNIX api call returned error)\n");
printf("Error message: %s\n", dlerror());
exit(-1);
}
@ -21,9 +21,9 @@ struct hotwire_dll_t hw_dlopen(const char *file, int flags) {
#if defined(_WIN32)
dll.dll_handle = LoadLibrary(file);
if (!dll.dll_handle){
printf("could not load dll(windows api call returned error)\n");
if (!dll.dll_handle) {
printf("Could not load dll(Windows api call returned error)\n");
hw_platform_win32_get_last_error(TEXT("LoadLibrary"));
exit(-1);
}
#endif
@ -31,12 +31,61 @@ struct hotwire_dll_t hw_dlopen(const char *file, int flags) {
return dll;
}
void* hw_dlsym(struct hotwire_dll_t dll, const char* symbol){
#if defined(_WIN32)
return GetProcAddress(dll.dll_handle, symbol);
#endif
void *hw_dlsym(struct hotwire_dll_t dll, const char *symbol) {
#if defined(_WIN32)
return GetProcAddress(dll.dll_handle, symbol);
#endif
#if defined(__linux) || defined(__APPLE__)
return dlsym(dll.dll_handle, symbol);
#endif
}
#if defined(__linux) || defined(__APPLE__)
return dlsym(dll.dll_handle, symbol);
#endif
}
enum hotwire_status_code hw_dlclose(struct hotwire_dll_t handle) {
#if defined(__linux) || defined(__APPLE__)
if (dlclose(handle.dll_handle) != 0) {
return Failed;
} else {
return Success;
}
#endif
#if defined(__WIN32)
if (FreeLibrary(handle.dll_handle)) {
return Success;
} else {
return Failed;
}
#endif
return NoPlatform;
}
#if defined(_WIN32)
void hw_platform_win32_get_last_error(LPTSTR lpszFunction) {
LPVOID lpMsgBuf;
LPVOID lpDisplayBuf;
DWORD dw = GetLastError();
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, dw, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR)&lpMsgBuf, 0, NULL);
// Display the error message and exit the process
lpDisplayBuf =
(LPVOID)LocalAlloc(LMEM_ZEROINIT, (lstrlen((LPCTSTR)lpMsgBuf) +
lstrlen((LPCTSTR)lpszFunction) + 40) *
sizeof(TCHAR));
StringCchPrintf((LPTSTR)lpDisplayBuf, LocalSize(lpDisplayBuf) / sizeof(TCHAR),
TEXT("%s failed with error %d: %s"), lpszFunction, dw,
lpMsgBuf);
printf("Error message: %s", (LPCTSTR)lpDisplayBuf);
LocalFree(lpMsgBuf);
LocalFree(lpDisplayBuf);
}
#endif

30
src/dlopen.h
View file

@ -11,24 +11,32 @@
#if defined(_WIN32)
#include <windows.h>
#include <strsafe.h>
#endif
// Platform specific code functions
#if defined(_WIN32)
void hw_platform_win32_get_last_error(LPTSTR lpszFunction);
#endif
enum hotwire_status_code { Failed, Success, NoPlatform };
struct hotwire_dll_t {
#if defined(__linux__) || defined(__APPLE__)
void* dll_handle;
#endif
#if defined(__linux__) || defined(__APPLE__)
void *dll_handle;
#endif
#if defined(_WIN32)
HINSTANCE dll_handle;
#endif
#if defined(_WIN32)
HINSTANCE dll_handle;
#endif
};
// Function arguments are based off the dlopen() api on POSIX based operating systems
// Loads dll from library
struct hotwire_dll_t hw_dlopen(const char* file, int flags);
// Function arguments are based off the dlopen() api on POSIX based operating
// systems Loads dll from library
struct hotwire_dll_t hw_dlopen(const char *file, int flags);
// Loads symbol from DLL
void* hw_dlsym(struct hotwire_dll_t dll, const char* symbol);
void *hw_dlsym(struct hotwire_dll_t dll, const char *symbol);
int hw_dlclose(void* handle);
enum hotwire_status_code hw_dlclose(struct hotwire_dll_t handle);